CN115371445B

CN115371445B - Yellow phosphorus flue gas purification system and industrial kiln flue gas purification device

Info

Publication number: CN115371445B
Application number: CN202210670334.4A
Authority: CN
Inventors: 高麟; 蒋敏; 任德忠; 林士全; 曾伍祥; 吴志强; 蒲柏林
Original assignee: Intermet Technology Chengdu Co Ltd
Current assignee: Intermet Technology Chengdu Co Ltd
Priority date: 2022-06-14
Filing date: 2022-06-14
Publication date: 2024-08-02
Anticipated expiration: 2042-06-14
Also published as: CN115371445A

Abstract

The invention discloses a yellow phosphorus flue gas purification system and an industrial kiln flue gas purification device. The yellow phosphorus flue gas purification system comprises: the device comprises a smoke overpressure protection device, a smoke filtering and dedusting device and a yellow phosphorus condensation recovery device, wherein the smoke overpressure protection device comprises a cylindrical container, an opening at one side of the cylindrical container is connected with a phosphorus furnace through a first vertical inclined pipe, an opening at the other side of the cylindrical container is connected with the smoke filtering and dedusting device through a second vertical inclined pipe, and a bottom opening is inserted below the liquid level of a water seal groove; the water seal tank is provided with a closed space and an open space which form a communicating vessel, the bottom opening of the cylindrical container is inserted below the liquid level of the closed space, and the upper space of the liquid level of the closed space in the water seal tank is connected with the diffusing tower or the yellow phosphorus condensation recovery device through a pipeline. When the gas pressure of the phosphorus furnace suddenly rises, equipment damage caused by the rising of the gas pressure of the gas filtering and dust removing device can be effectively avoided through the gas overpressure protection device.

Description

Yellow phosphorus flue gas purification system and industrial kiln flue gas purification device

Technical Field

The embodiment of the application relates to the technical field of flue gas purification, in particular to a yellow phosphorus flue gas purification system, an industrial kiln flue gas purification device, a flue gas pretreatment device, a flue gas filtering and dust removing device, flue gas filtering and dust removing equipment and a filter element regeneration method of the flue gas filtering and dust removing equipment.

Background

Yellow phosphorus is an extremely important basic industrial raw material, is mainly used in a plurality of fields such as chemical industry, pesticides, military and the like, and especially the demand of the current lithium iron phosphate battery is increased to further pull the demand of yellow phosphorus to be improved. Because of high energy consumption, heavy pollution and prominent environmental risk problems in yellow phosphorus production, developed countries have stopped producing yellow phosphorus for many years, and China is currently the main country for producing yellow phosphorus. In recent years, with the continuous enhancement of environmental protection, the development of yellow phosphorus production technology towards the green direction is promoted to become a very important issue in the phosphorus chemical industry.

The applicant of the present application has been actively developing and popularizing yellow phosphorus green production technology in recent years. The applicant discloses in the patent document with publication number CN103523762B, CN103508429B that the main technical idea of the yellow phosphorus green production process is that the yellow phosphorus flue gas discharged by a phosphorus furnace is filtered and dedusted by a flue gas filtering and dedusting device (the flue gas filtering and dedusting device physically intercepts dust in the yellow phosphorus flue gas through a filter core), and the temperature in the flue gas filtering and dedusting device can maintain the yellow phosphorus in the yellow phosphorus flue gas above the dew point temperature, so that the yellow phosphorus is in a gaseous state, the dust content of the yellow phosphorus flue gas can be reduced to below 10-20 mg per standard by filtering and dedusting, and then the yellow phosphorus flue gas is condensed, thereby greatly reducing the generation of mud phosphorus and sewage, and hopefully fundamentally solving the problem of high pollution in the yellow phosphorus production.

As the applicant goes deep into yellow phosphorus manufacturers to popularize and implement the yellow phosphorus green production process, the applicant also carries out updating iteration on the related technology according to the field condition, and in the process, new requirements or problems are often encountered.

For example, the applicant discloses a safety auxiliary device of a yellow phosphorus production system in the patent document with publication number CN205023857U, and adds a water seal pressure relief system which is arranged between a furnace gas inlet pipe and a washing tower (belonging to a yellow phosphorus condensation recovery device) of the phosphorus furnace in parallel with the filtering system, aiming at the problem that the internal pressure of the phosphorus furnace suddenly rises and a blower or a draught fan of the filtering system cannot quickly increase frequency to absorb a large amount of yellow phosphorus flue gas so as to cause the flaming phenomenon of the phosphorus furnace. However, the water seal pressure relief system is mainly arranged for preventing the pressure of the phosphorus furnace from rising and generating a flaming phenomenon, namely, is mainly arranged for protecting the phosphorus furnace. When the pressure of the phosphorus furnace is increased to further cause the increase of the air pressure in the smoke filtering dust removing device in the filtering system, the water seal pressure relief system does not respond timely to the pressure relief requirement of the smoke filtering dust removing device. Therefore, the safety auxiliary device of the yellow phosphorus production system has poor effect on protecting the flue gas filtering and dust removing device.

For another example, the applicant discloses a yellow phosphorus flue gas purifying system in the patent document with the publication number CN203513281U, and specifically provides the following scheme for preventing the liquid yellow phosphorus from precipitating by heating and preserving heat of yellow phosphorus flue gas discharged from the phosphorus furnace before dust removal: the phosphorus furnace is connected with a furnace gas dust collection system through a smoke exhaust pipeline, the smoke exhaust pipeline is provided with a gas ascending section and a gas descending section which are connected with each other, an inlet of the gas ascending section is connected with the phosphorus furnace, an outlet of the gas descending section is connected with the furnace gas dust collection system, an electric heater is arranged at the tail pipe section of the gas ascending section, and the starting end of the gas descending section is connected to the side of the tail pipe section of the gas ascending section. When the device works, yellow phosphorus flue gas from the phosphorus furnace flows from top to bottom in the gas ascending section, fully exchanges heat with the electric heater when reaching the tail pipe section, then changes direction to enter the starting end of the gas descending section, and dust particles in the gas flow impact the pipe wall under inertia, so that the dust particles settle along with the gas flow. Above-mentioned exhaust flue is based on promoting heat exchange efficiency mainly, promotes the purpose design that the dust subsided. The inventor of the application discovers based on practical conditions that dust is gradually attached to a heating pipe of an electric heater due to higher dust content in yellow phosphorus flue gas, and at the moment, the heat exchange efficiency is affected. In addition, the above patent purposely installs the electric heater at the last pipe section of the gas rising section so as to be in full contact with the gas flow, but the yellow phosphorus is easily promoted to be red phosphorus due to the higher heating temperature of the electric heater, thereby reducing the yield of the yellow phosphorus.

For example, the applicant discloses an ash discharging device and an ash discharging method in the patent document with publication number CN111359335A, and designs a two-stage ash discharging method, namely, firstly discharging the dust into a middle tank, then inputting a replacement gas into the middle tank, thereby replacing yellow phosphorus vapor in the dust, and then discharging the dust in the middle tank, aiming at the problems that yellow phosphorus vapor is difficult to mix into the dust intercepted by the dust removing device, yellow phosphorus is an easy-phase change substance, has a burning explosion risk, and directly discharges the dust with the yellow phosphorus vapor, which has high risk. However, a plurality of valves are required to be installed in two-stage ash discharge, and linkage control is required to be carried out on the valves and other related equipment during ash discharge, so that the valves and the related equipment have high requirements on working stability, and once part of equipment fails, ash cannot be discharged. In a word, above-mentioned ash discharging device structure is comparatively complicated, when being applied to yellow phosphorus gas cleaning system, and the job stabilization margin still can further improve.

For another example, the applicant discloses a method for regenerating a gas filter core in the patent document with publication number CN104645732a, and proposes that after the flue gas filtering and dust removing device is stopped, mixed combustion-supporting gas with oxygen content of 0.01% -1.99% and the rest of nitrogen is introduced into the flue gas filtering and dust removing device, so that all filter cores in the flue gas filtering and dust removing device are integrally placed therein, and oxidation reaction of controllable combustion is carried out on the combustion-supporting gas and dust, tar and/or yellow phosphorus deposited on the surfaces of the filter cores at a set temperature of 100-900 ℃, and the gas after the oxidation reaction is discharged through an exhaust structure. However, the regeneration method needs to trigger combustion and generate high temperature in the flue gas filtering and dust removing device, so that the high temperature resistance of the flue gas filtering and dust removing device and the filter element thereof is higher, and the implementation cost is increased.

Disclosure of Invention

In view of at least one of the above technical problems, the following solutions are proposed.

In a first aspect, there is provided a yellow phosphorus flue gas cleaning system comprising: the smoke overpressure protection device is used for receiving yellow phosphorus smoke discharged by the phosphorus furnace, guiding the yellow phosphorus smoke to the diffusing tower or the yellow phosphorus condensation recovery device when the air pressure of the yellow phosphorus smoke reaches a set threshold value, and guiding the yellow phosphorus smoke to the smoke filtering and dust removing device when the air pressure of the yellow phosphorus smoke does not reach the set threshold value; the smoke filtering and dust removing device is used for receiving the yellow phosphorus smoke from the smoke overpressure protection device, physically intercepting dust in the yellow phosphorus smoke through the filter element under the temperature condition that the yellow phosphorus in the yellow phosphorus smoke is still in a gaseous state, and then outputting the yellow phosphorus smoke after filtering, dust removing and purifying; the yellow phosphorus condensation recovery device is used for receiving the yellow phosphorus flue gas from the flue gas filtering and dust removing device, directly or indirectly condensing the yellow phosphorus flue gas through a cooling medium, converting the yellow phosphorus from a gas state to a liquid state, then storing the yellow phosphorus in a yellow phosphorus tank, and outputting tail gas; the smoke overpressure protection device comprises a cylindrical container, wherein an opening at one side of the cylindrical container is connected with the phosphorus furnace through a first vertical inclined pipe, an opening at the other side of the cylindrical container is connected with the smoke filtering and dust removing device through a second vertical inclined pipe, and the opening at the bottom of the cylindrical container is inserted below the liquid level of the water seal groove; the water seal tank is provided with a closed space and an open space which form a communicating vessel, the bottom opening of the cylindrical container is inserted below the liquid level of the closed space, and the upper space of the liquid level of the closed space in the water seal tank is connected with the diffusing tower or the yellow phosphorus condensation recovery device through a pipeline.

In a second aspect, there is provided an industrial kiln flue gas cleaning device comprising: the smoke overpressure protection device is used for receiving smoke discharged by the industrial kiln and guiding the smoke to a diffusing tower or subsequent equipment of the smoke filtering and dust removing device when the air pressure of the smoke reaches a set threshold value, and guiding the smoke to the smoke filtering and dust removing device when the air pressure of the smoke does not reach the set threshold value; the smoke filtering and dust removing device is used for receiving the smoke from the smoke overpressure protection device, physically intercepting dust in the smoke through the filter element and then outputting the smoke after filtering, dust removing and purifying; the smoke overpressure protection device comprises a cylindrical container, wherein an opening at one side of the cylindrical container is connected with the industrial kiln through a pipeline, an opening at the other side of the cylindrical container is connected with the smoke filtering and dust removing device through a pipeline, and the bottom opening is inserted below the liquid level of the liquid seal groove; the liquid seal tank is provided with a closed space and an open space which form a communicating vessel, the bottom opening of the cylindrical container is inserted below the liquid level of the closed space, and the upper space of the liquid level of the closed space in the liquid seal tank is connected with the diffusing tower or the subsequent equipment of the flue gas filtering and dust removing device through a pipeline.

The yellow phosphorus flue gas purification system of the first aspect and the industrial kiln flue gas purification device of the second aspect are provided with similar flue gas overpressure protection devices before the flue gas filtering and dust removing devices. The flue gas overpressure protection device has the function of guiding the flue gas to be filtered to the diffusing tower or the subsequent equipment of the flue gas filtering and dust removing device when the air pressure of the flue gas to be filtered reaches a set threshold value, and guiding the flue gas filtering and dust removing device when the air pressure of the industrial kiln is not up to the set threshold value. The cylindrical container in the smoke overpressure protection device has a certain buffer function, and is beneficial to reducing the pressure fluctuation of the smoke filtering dust removal device. Because the liquid seal groove is provided with the closed space and the open space which form the communicating vessel, the bottom opening of the cylindrical container is inserted below the liquid level of the closed space, and the upper space of the liquid level of the closed space in the liquid seal groove is connected with the diffusing tower or the subsequent equipment of the flue gas filtering and dust removing device through a pipeline, when the air pressure in the upper space rises in the pressure relief process of the flue gas overpressure protection device, the liquid level of the closed space can be pushed to fall and the liquid level of the open space rises, the excessive pressure in the upper space is prevented, and the corresponding pressure relief rate is improved.

In a third aspect, there is provided a yellow phosphorus flue gas cleaning system comprising: the smoke filtering and dust removing device is used for receiving yellow phosphorus smoke from the phosphorus smoke discharge, physically intercepting dust in the yellow phosphorus smoke through the filter element under the temperature condition that the yellow phosphorus in the yellow phosphorus smoke is still in a gaseous state, and then outputting the yellow phosphorus smoke after filtering, dust removing and purifying; the flue gas flow driving device is used for receiving the yellow phosphorus flue gas output by the flue gas filtering and dust removing device, and discharging the pressurized yellow phosphorus flue gas after the pressure of the yellow phosphorus flue gas is increased by mechanical energy; the yellow phosphorus condensation recovery device is used for receiving the yellow phosphorus flue gas from the flue gas airflow driving device, directly or indirectly condensing the yellow phosphorus flue gas through a cooling medium, converting the yellow phosphorus from a gas state to a liquid state, then storing the yellow phosphorus in a yellow phosphorus tank, and outputting tail gas; the smoke overpressure protection device is used for receiving yellow phosphorus smoke output by the smoke filtering and dust removing device, and guiding the yellow phosphorus smoke to the diffusing tower or the yellow phosphorus condensation recovery device through a bypass when the air pressure of the yellow phosphorus smoke reaches a set threshold value, and cutting off the bypass when the air pressure of the yellow phosphorus smoke does not reach the set threshold value; the smoke overpressure protection device comprises a drainage tube, one end of the drainage tube is connected with the smoke filtering and dust removing device, the other end of the drainage tube is inserted below the liquid level of the water seal groove, and the upper space of the liquid level in the water seal groove is connected with the diffusing tower or the yellow phosphorus condensation recovery device through a pipeline.

In a fourth aspect, an industrial kiln flue gas cleaning device is provided, comprising: the flue gas filtering and dust removing device is used for receiving flue gas discharged from an industrial kiln, physically intercepting dust in the flue gas through a filter element, and then outputting the flue gas after filtering, dust removing and purifying; the flue gas flow driving device is used for receiving the flue gas output from the flue gas filtering and dust removing device, and discharging the pressurized yellow phosphorus flue gas after the pressure of the yellow phosphorus flue gas is increased by mechanical energy; the flue gas overpressure protection device is used for receiving flue gas from the flue gas filtering and dust removing device, and guiding the flue gas to a diffusing tower or subsequent equipment of the flue gas flow driving device through a bypass when the air pressure of the flue gas reaches a set threshold value, and cutting off the bypass when the air pressure of the flue gas does not reach the set threshold value; the smoke overpressure protection device comprises a drainage tube, one end of the drainage tube is connected with the smoke filtering and dust removing device, the other end of the drainage tube is inserted below the liquid level of the liquid seal groove, and the upper space of the liquid level in the liquid seal groove is connected with the diffusing tower or subsequent equipment of the smoke airflow driving device through a pipeline.

The yellow phosphorus flue gas purification system of the third aspect and the industrial kiln flue gas purification device of the fourth aspect are connected with the flue gas overpressure protection device and the flue gas air flow driving device in parallel after the flue gas filtering and dust removing device, when the air pressure of the industrial kiln suddenly rises, the flue gas overpressure protection device can guide flue gas to follow-up equipment of the diffusing tower or the flue gas air flow driving device by bypassing the flue gas air flow driving device, and the problem that the air pressure of the flue gas filtering and dust removing device cannot be rapidly relieved due to incapability of rapidly increasing the frequency of the flue gas air flow driving device is prevented. Meanwhile, as the smoke overpressure protection device is arranged behind the smoke filtering dust removal device, the content of air flow dust released by the smoke overpressure protection device is very low, and the air pollution or the influence on subsequent equipment of the smoke air flow driving device is reduced.

In a fifth aspect, there is provided an industrial kiln flue gas cleaning device comprising: the flue gas pretreatment device is used for receiving flue gas discharged from the industrial kiln, pretreating the flue gas and outputting pretreated flue gas; the flue gas filtering and dust removing device is used for receiving the flue gas from the flue gas pretreatment device, physically intercepting dust in the flue gas through the filter element, and then outputting the flue gas after filtering, dust removing and purifying; the flue gas pretreatment device comprises an air flow buffer, wherein the air flow buffer is provided with an air inlet section, a reducing shrinkage section, a reducing expansion section and an exhaust section which are sequentially arranged according to the flow direction of flue gas, the air inlet section is used for receiving the flue gas discharged from an industrial kiln, and the exhaust section is used for outputting the pretreated flue gas; in addition, the flue gas pretreatment device further comprises a heat exchanger, wherein the heat exchanger is arranged in the exhaust section and is arranged opposite to the outlet of the reducing expansion section.

In a sixth aspect, a flue gas pretreatment device is provided, which is used for receiving flue gas discharged from an industrial kiln, pretreating the flue gas, and then outputting the pretreated flue gas to a flue gas filtering and dust removing device; the device comprises an air flow buffer, wherein the air flow buffer is provided with an air inlet section, a reducing shrinkage section, a reducing expansion section and an exhaust section which are sequentially arranged according to the flow direction of the flue gas, the air inlet section is used for receiving the flue gas discharged from an industrial kiln, and the exhaust section is used for outputting the pretreated flue gas; in addition, the flue gas pretreatment device further comprises a heat exchanger, wherein the heat exchanger is arranged in the exhaust section and is arranged opposite to the outlet of the reducing expansion section.

The industrial furnace flue gas cleaning device according to the fifth aspect and the flue gas pretreatment device according to the sixth aspect employ an air flow buffer having an air inlet section, a reducing shrinkage section, a reducing expansion section and an exhaust section which are sequentially arranged in accordance with the flow direction of the flue gas, and the air flow is increased by venturi effect flow velocity when passing through the reducing shrinkage section and the reducing expansion section, so that the problem of heat exchange efficiency reduction caused by the adhesion of pollutants such as dust on a heat exchanger (electric heater) can be alleviated. In addition, due to the increase of the flow velocity of the air flow, the time for the air flow to pass through the heat exchanger (electric heater) is shortened, and the occurrence of the condition that yellow phosphorus is converted into red phosphorus and the like can be prevented.

In a seventh aspect, a yellow phosphorus flue gas cleaning system is provided, comprising: the flue gas filtering and dust removing device is used for receiving yellow phosphorus flue gas discharged by the phosphorus furnace, physically intercepting dust in the yellow phosphorus flue gas through a filter element under the temperature condition that yellow phosphorus in the yellow phosphorus flue gas is still in a gaseous state, and then outputting yellow phosphorus flue gas after filtering, dust removing and purifying; the yellow phosphorus condensation recovery device is used for receiving the yellow phosphorus flue gas from the flue gas filtering and dust removing device, directly or indirectly condensing the yellow phosphorus flue gas through a cooling medium, converting the yellow phosphorus from a gas state to a liquid state, then storing the yellow phosphorus in a yellow phosphorus tank, and outputting tail gas; the flue gas filtering and dedusting device comprises a deduster cylinder, the filter element is arranged in the deduster cylinder through a filter element mounting plate and divides the deduster cylinder into a lower original air chamber and an upper air purifying chamber, the original air chamber is provided with an air inlet for receiving yellow phosphorus flue gas discharged by a phosphorus furnace, the air purifying chamber is provided with an air outlet for outputting yellow phosphorus flue gas after filtering and dedusting purification, and the bottom of the deduster cylinder is provided with a discharging channel communicated with the original air chamber; in addition, the flue gas filtering and dust removing device further comprises a water seal tank, the bottom opening of the discharging channel is inserted below the liquid level of the water seal tank, and a discharging structure is arranged at the bottom of the water seal tank.

In an eighth aspect, there is provided a flue gas filtering dust removal device comprising: the flue gas filtering and dust removing device is used for receiving flue gas discharged by the industrial kiln, physically intercepting dust in the flue gas through the filter element, and then outputting the flue gas after filtering, dust removing and purifying; the flue gas filtering and dedusting device comprises a deduster cylinder, the filter element is arranged in the deduster cylinder through a filter element mounting plate and divides the deduster cylinder into a lower original air chamber and an upper air purifying chamber, the original air chamber is provided with an air inlet for receiving yellow phosphorus flue gas discharged by a phosphorus furnace, the air purifying chamber is provided with an air outlet for outputting yellow phosphorus flue gas after filtering and dedusting purification, and the bottom of the deduster cylinder is provided with a discharging channel communicated with the original air chamber; in addition, flue gas filtration dust collector still contains the liquid seal groove, the discharge channel inserts under the liquid level of this liquid seal groove, the bottom of liquid seal groove is equipped with the row material structure.

The yellow phosphorus flue gas purification system of the seventh aspect and the flue gas filtering and dust removing device of the eighth aspect are designed to discharge the yellow phosphorus flue gas dust and other similar dust, and the structure of the discharge channel inserted below the liquid surface of the liquid seal tank (the water seal tank when the yellow phosphorus flue gas dust is in the yellow phosphorus flue gas dust) is greatly simplified compared with the structure of the two-stage ash discharging mode. The dust discharged through the discharging channel can sink below the liquid level, so that the contact of yellow phosphorus carried in the dust with air is avoided, and the dust and condensed yellow phosphorus are discharged through the discharging structure.

In a ninth aspect, there is provided a yellow phosphorus flue gas cleaning system comprising: the flue gas pretreatment device is used for receiving yellow phosphorus flue gas from the phosphorus furnace, pretreating the yellow phosphorus flue gas and outputting pretreated yellow phosphorus flue gas; the smoke filtering and dust removing device is used for receiving the yellow phosphorus smoke from the smoke pretreatment device, physically intercepting dust in the yellow phosphorus smoke through the filter element under the temperature condition that the yellow phosphorus in the yellow phosphorus smoke is still in a gaseous state, and then outputting the yellow phosphorus smoke after filtering, dust removing and purifying; the yellow phosphorus condensation recovery device is used for receiving the yellow phosphorus flue gas from the flue gas filtering and dust removing device, directly or indirectly condensing the yellow phosphorus flue gas through a cooling medium, converting the yellow phosphorus from a gas state to a liquid state, then storing the yellow phosphorus in a yellow phosphorus tank, and outputting tail gas; the flue gas pretreatment device comprises an air flow buffer, wherein the air flow buffer is provided with an air flow buffer cylinder, an air flow buffer space is formed in the air flow buffer cylinder, an air inlet for receiving yellow phosphorus flue gas discharged from a phosphorus furnace and an air outlet for outputting pretreated yellow phosphorus flue gas are arranged on the air flow buffer space, and a discharging channel communicated with the air flow buffer space is arranged at the bottom of the air flow buffer cylinder; and the flue gas pretreatment device further comprises a water seal tank, the bottom opening of the discharging channel is inserted below the liquid level of the water seal tank, and the bottom of the water seal tank is provided with a discharging structure.

In a tenth aspect, a flue gas pretreatment device is provided, and is used for receiving flue gas discharged from an industrial kiln, pretreating the flue gas, and then outputting the pretreated flue gas to a flue gas filtering and dust removing device; the device comprises an air flow buffer, wherein the air flow buffer is provided with an air flow buffer cylinder body, an air flow buffer space is formed in the air flow buffer cylinder body, an air inlet for receiving flue gas discharged from an industrial kiln and an air outlet for outputting pretreated flue gas are arranged in the air flow buffer space, and a discharging channel communicated with the air flow buffer space is arranged at the bottom of the air flow buffer cylinder body; and the flue gas pretreatment device further comprises a liquid seal groove, the discharging channel is inserted below the liquid level of the liquid seal groove, and a discharging structure is arranged at the bottom of the liquid seal groove.

Similarly, the yellow phosphorus flue gas purification system of the ninth aspect and the flue gas filtering and dust removing device of the tenth aspect are designed to discharge the yellow phosphorus flue gas dust and other similar dust, and the structure of the discharge channel inserted below the liquid surface of the liquid seal groove (the water seal groove when the yellow phosphorus flue gas dust is formed) is greatly simplified compared with the structure of the two-stage ash discharging mode. The dust discharged through the discharging channel can sink below the liquid level, so that the contact of yellow phosphorus carried in the dust with air is avoided, and the dust and condensed yellow phosphorus are discharged through the discharging structure.

In an eleventh aspect, there is provided a flue gas filtration dust removal apparatus comprising: the dust remover cylinder is used for providing a shell of the flue gas filtering dust removing device; the filter element is arranged in the dust remover cylinder body to form an original air chamber and a clean air chamber; the air inlet structure is arranged on the dust remover cylinder body and is communicated with the original air chamber; the exhaust structure is arranged on the dust remover cylinder body and is communicated with the clean air chamber; the ash discharging structure is arranged at the bottom of the dust remover cylinder body and is communicated with the lower part of the original air chamber; the filter element regeneration liquid cleaning structure is used for providing regeneration liquid capable of cleaning pollutants on the filter element for the filter element; the regeneration liquid discharge structure is arranged at the bottom of the dust remover cylinder and is communicated with the lower part of the original air chamber; the dust remover drying structure is used for drying the inside of the dust remover cylinder.

In a twelfth aspect, there is provided a method for regenerating a filter element of a flue gas filtering dust removing apparatus, using the flue gas filtering dust removing apparatus of the eleventh aspect, comprising: closing the air inlet structure; providing the regeneration liquid to the filter element through the filter element regeneration liquid cleaning structure; discharging the regeneration liquid out of the dust collector cylinder through the regeneration liquid discharge structure; and drying the inside of the dust remover cylinder body through the dust remover drying structure.

The flue gas filtering and dust removing device of the eleventh aspect and the method for regenerating the filter element of the flue gas filtering and dust removing device of the twelfth aspect creatively adopt the regenerated liquid to clean the filter element of the flue gas filtering and dust removing device, and then dry the inside of the dust remover cylinder through the dust remover drying structure, so that the regenerated liquid cannot remain in the dust remover cylinder to influence filtering and dust removing. The regeneration mode is simpler, more convenient and safer.

The application is further described below with reference to the drawings and detailed description. Additional aspects and advantages of the application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate the application and, together with the description, serve to explain the principles of the application.

Fig. 1 is a schematic structural diagram of a yellow phosphorus flue gas purification system according to an embodiment of the present application.

Fig. 2 is a schematic structural diagram of a yellow phosphorus flue gas purification system according to an embodiment of the present application.

Fig. 3 is a schematic structural diagram of a yellow phosphorus flue gas purification system according to an embodiment of the present application.

Fig. 4 is a schematic structural diagram of a yellow phosphorus flue gas purification system according to an embodiment of the present application.

Fig. 5 is a schematic structural diagram of a yellow phosphorus flue gas purification system according to an embodiment of the present application.

Fig. 6 is a schematic structural diagram of a yellow phosphorus flue gas purification system according to an embodiment of the present application.

Fig. 7 is a schematic structural diagram of a yellow phosphorus flue gas purification system according to an embodiment of the present application.

Fig. 8 is a schematic structural diagram of a yellow phosphorus flue gas purification system according to an embodiment of the present application.

Fig. 9 is a schematic structural diagram of a water seal tank in a yellow phosphorus flue gas purification system according to an embodiment of the present application.

Fig. 10 is a schematic structural diagram of a water seal tank in a yellow phosphorus flue gas purification system according to an embodiment of the present application.

Fig. 11 is a schematic structural diagram of a water seal tank in a yellow phosphorus flue gas purification system according to an embodiment of the present application.

Fig. 12 is an engineering structure diagram of a flue gas pretreatment device according to an embodiment of the present application.

Detailed Description

The present application will now be described more fully hereinafter with reference to the accompanying drawings. Those of ordinary skill in the art will be able to implement the application based on these descriptions. Before describing the present application with reference to the accompanying drawings, it should be noted in particular that:

The technical solutions and technical features provided in the respective sections including the following description may be combined with each other without conflict. Furthermore, the described embodiments, features, and combinations of features can be combined as desired and claimed in any given application.

The embodiments of the application that are referred to in the following description are typically only a few, but not all, embodiments, based on which all other embodiments, as would be apparent to one of ordinary skill in the art without the benefit of the present disclosure, are intended to be within the scope of the patent protection.

With respect to terms and units in this specification: the terms "comprising," "including," "having," and any variations thereof, in this specification and the corresponding claims and related parts, are intended to cover a non-exclusive inclusion. Furthermore, other related terms and units may be reasonably construed based on the description provided herein.

The applicant discloses in the patent document with publication number CN103523762B, CN103508429B that the main technical idea of yellow phosphorus green production process is that yellow phosphorus flue gas discharged by a phosphorus furnace is filtered and dedusted by a flue gas filtering and dedusting device, dust in the yellow phosphorus flue gas is physically intercepted by the flue gas filtering and dedusting device through a filter element, in the process, the temperature in the flue gas filtering and dedusting device can maintain yellow phosphorus in the yellow phosphorus flue gas above the dew point temperature, so that the yellow phosphorus is in a gaseous state, the dust content of the yellow phosphorus flue gas can be reduced to below 10-20 mg per standard (even below 5-10 mg per standard), and then the yellow phosphorus flue gas is condensed, thereby greatly reducing the generation of mud phosphorus and sewage, and hopefully fundamentally solving the problem of high pollution in yellow phosphorus production.

The temperature in the flue gas filtering and dust removing device can maintain the yellow phosphorus in the yellow phosphorus flue gas above the dew point temperature, so the flue gas filtering and dust removing device can be also called a high-temperature flue gas filtering and dust removing device. The core is that the filter material used by the filter element can not only endure higher temperature (the recommended temperature range is given in CN103523762B, CN103508429B and is not repeated here), but also ensure higher filtering efficiency and filtering flux, the filtering effect can be represented by the dust content of yellow phosphorus flue gas after filtering and dedusting, and the filtering flux can be represented by the volume of gas filtered per unit filtering area in unit time.

During the use of the filter element, dust is attached to the filtering surface of the filter element, so that the filtering flux gradually decreases. The conventional mode is to carry out back-blowing ash removal on the filter elements, the back-blowing ash removal is the traditional technology of a smoke filter, and a blowing pipe can be usually adopted to aim at the air outlet of each filter element for back-blowing. Besides the back-blowing ash removal of the filter element, when the filter element is seriously polluted and the filtering flux can not be effectively recovered through the back-blowing ash removal, the filter element can be regenerated. The specific regeneration will be described later.

Due to the arrangement of the flue gas filtering and dust removing device, a series of specific problems of how to reduce the influence of the flue gas filtering and dust removing device on the yellow phosphorus production process, how to realize ash discharging of the flue gas filtering and dust removing device, how to control the temperature of yellow phosphorus flue gas which is about to enter the flue gas filtering and dust removing device, how to regenerate a filter element of the flue gas filtering and dust removing device and the like are correspondingly brought, and related technologies are formed aiming at the specific problems.

Along with the deep popularization and implementation of yellow phosphorus green production process by the applicant, the applicant also carries out updating iteration on the related technology according to the field condition, so that the applicant sequentially submits patent applications with publication number/bulletin number of CN205023857U, CN203513281U, CN111359335A, CN104645732A and the like.

CN205023857U discloses a safety auxiliary device for a yellow phosphorus production system, and a water seal pressure relief system which is arranged between a furnace gas inlet pipe and a washing tower (belonging to a yellow phosphorus condensation recovery device) of a phosphorus furnace in parallel with a filtering system is additionally arranged for solving the problem that the internal pressure of the phosphorus furnace suddenly rises and a blower or a draught fan of the filtering system cannot rapidly increase the frequency to absorb a large amount of yellow phosphorus flue gas so as to cause the flaming phenomenon of the phosphorus furnace.

However, the water seal pressure relief system is mainly arranged for preventing the pressure of the phosphorus furnace from rising and generating a flaming phenomenon, namely, is mainly arranged for protecting the phosphorus furnace. When the pressure of the phosphorus furnace is increased to further cause the increase of the air pressure in the smoke filtering dust removing device in the filtering system, the water seal pressure relief system does not respond timely to the pressure relief requirement of the smoke filtering dust removing device. Therefore, the safety auxiliary device of the yellow phosphorus production system has poor effect on protecting the flue gas filtering and dust removing device.

CN203513281U discloses a yellow phosphorus flue gas purification system, and the yellow phosphorus flue gas to phosphorus grate needs heating heat preservation in order to prevent liquid yellow phosphorus to separate out the problem before removing dust, specifically provides following scheme: the phosphorus furnace is connected with a furnace gas dust collection system through a smoke exhaust pipeline, the smoke exhaust pipeline is provided with a gas ascending section and a gas descending section which are connected with each other, an inlet of the gas ascending section is connected with the phosphorus furnace, an outlet of the gas descending section is connected with the furnace gas dust collection system, an electric heater is arranged at the tail pipe section of the gas ascending section, and the starting end of the gas descending section is connected to the side of the tail pipe section of the gas ascending section. When the device works, yellow phosphorus flue gas from the phosphorus furnace flows from top to bottom in the gas ascending section, reaches the tail pipe section, exchanges heat with the electric heater sufficiently, and then changes direction to enter the starting end of the gas descending section, dust particles in the gas flow impact the pipe wall under inertia, and accordingly the dust particles settle along with the gas flow.

Above-mentioned exhaust flue is based on promoting heat exchange efficiency mainly, promotes the purpose design that the dust subsided. The inventor of the application discovers based on practical conditions that dust is gradually attached to a heating pipe of an electric heater due to higher dust content in yellow phosphorus flue gas, and at the moment, the heat exchange efficiency is affected. In addition, the above patent purposely installs the electric heater at the last pipe section of the gas rising section so as to be in full contact with the gas flow, but the yellow phosphorus is easily promoted to be red phosphorus due to the higher heating temperature of the electric heater, thereby reducing the yield of the yellow phosphorus.

CN111359335A discloses an ash discharging device and an ash discharging method, and a two-stage ash discharging method is designed, namely, firstly discharging the dust into a middle tank, then inputting replacement gas into the middle tank, thereby replacing yellow phosphorus vapor in the dust, and then discharging the dust in the middle tank.

However, two-stage ash discharge requires a plurality of valves to be installed, and the valves and other related devices need to be controlled in a linkage manner during ash discharge, so that the valves and the related devices have high requirements on working stability, and once part of the devices fail, ash cannot be discharged. In a word, above-mentioned ash discharging device structure is comparatively complicated, when being applied to yellow phosphorus gas cleaning system, and the job stabilization margin still can further improve.

In CN104645732A, a method for regenerating a gas filter core is disclosed, aiming at the problems that the filtering holes on the surface of the filter core in a flue gas filtering and dust removing device are blocked and the conventional back blowing ash removing is difficult to effectively recover the filtering flux, the method is proposed that after the flue gas filtering and dust removing device is stopped, mixed combustion-supporting gas with the oxygen content of 0.01-1.99% and the rest of nitrogen is introduced into the flue gas filtering and dust removing device, so that all the filter cores in the flue gas filtering and dust removing device are integrally arranged in the mixed combustion-supporting gas, and the oxidation reaction of controllable combustion is carried out on the combustion-supporting gas and dust, tar, yellow phosphorus and other impurities deposited on the surface of the filter core at the set temperature of 100-900 ℃ and the gas after the oxidation reaction is discharged through an exhaust structure.

However, the regeneration method needs to trigger combustion and generate high temperature in the flue gas filtering and dust removing device, and has higher requirements on the high temperature resistance of the flue gas filtering and dust removing device and the filter element thereof, thereby increasing the implementation cost.

The following describes related embodiments of the application which solve at least one of the above-mentioned problems, and which solve two or more of the above-mentioned problems when implemented alone.

Fig. 1 is a schematic structural diagram of a yellow phosphorus flue gas purification system according to an embodiment of the present application. As shown in fig. 1, the yellow phosphorus flue gas purification system includes: the device comprises a flue gas overpressure protection device 200, a flue gas pretreatment device 300, a flue gas filtering and dust removing device 400, a flue gas flow driving device 500 and a yellow phosphorus condensation recovery device 600.

The flue gas overpressure protection device 200 is used for receiving yellow phosphorus flue gas discharged by the phosphorus furnace 100, and guiding the yellow phosphorus flue gas to a diffusing tower (not shown) or a yellow phosphorus condensation recovery device 600 when the air pressure of the yellow phosphorus flue gas reaches a set threshold value, and guiding the yellow phosphorus flue gas to the flue gas pretreatment device 300 when the air pressure of the yellow phosphorus flue gas does not reach the set threshold value.

The flue gas pretreatment device 300 is disposed between the flue gas overpressure protection device 200 and the flue gas filtering dust removal device 400, and is configured to receive yellow phosphorus flue gas from the flue gas overpressure protection device 200, pretreat the yellow phosphorus flue gas, and then output the pretreated yellow phosphorus flue gas.

The flue gas filtering and dust removing device 400 is configured to receive yellow phosphorus flue gas from the flue gas pretreatment device 300, physically intercept dust in the yellow phosphorus flue gas by using the filter element 410 under a temperature condition that yellow phosphorus in the yellow phosphorus flue gas is still in a gaseous state, and then output yellow phosphorus flue gas after filtering, dust removing and purifying.

The flue gas flow driving device 500 (generally, a fan) is configured to receive the yellow phosphorus flue gas output from the flue gas filtering and dust removing device 400, and to increase the pressure of the yellow phosphorus flue gas by using mechanical energy, and then discharge the pressurized yellow phosphorus flue gas.

The yellow phosphorus condensation recovery device 600 is configured to receive the yellow phosphorus flue gas from the flue gas airflow driving device 500, directly or indirectly condense the yellow phosphorus flue gas through a cooling medium, so that the yellow phosphorus is converted from a gas state to a liquid state, and then stored in the yellow phosphorus tank 610, and meanwhile, output tail gas.

The flue gas overpressure protection device 200 comprises a cylindrical container 210, wherein an opening at one side of the cylindrical container 210 is connected with the phosphorus furnace 100 through a first vertical inclined pipe 220, an opening at the other side of the cylindrical container is connected with the flue gas pretreatment device 300 through a second vertical inclined pipe 230, and the opening at the bottom of the cylindrical container is inserted below the liquid surface of a water seal tank 240.

Referring to fig. 9 to 10, the water seal tank 240 has a closed space 241 and an open space 242 which constitute a communicating vessel, the bottom opening of the cylindrical vessel 210 is inserted under the liquid surface of the closed space 241 (the depth of the insertion under the liquid surface is adapted to the above-mentioned set threshold value), and the upper space of the liquid surface of the closed space 241 in the water seal tank 240 is connected to the diffusing tower or the yellow phosphorus condensation recovery apparatus 600 via a pipe 250.

The flue gas pretreatment device 300 comprises an air flow buffer, the air flow buffer is provided with an air flow buffer cylinder 310, an air flow buffer space is formed in the air flow buffer cylinder 310, and an air inlet for receiving yellow phosphorus flue gas from the flue gas overpressure protection device 200 and an air outlet for outputting pretreated yellow phosphorus flue gas are arranged on the air flow buffer space.

The yellow phosphorus flue gas purification system is provided with a flue gas overpressure protection device 200 before the flue gas filtering and dust removing device 400. Because the flue gas overpressure protection device 200 is used for guiding the yellow phosphorus flue gas discharged by the phosphorus furnace 100 to the diffusing tower or the yellow phosphorus condensation recovery device 600 when the air pressure of the yellow phosphorus flue gas reaches a set threshold value, and guiding the yellow phosphorus flue gas to the flue gas filtration dust removal device 400 after passing through the flue gas pretreatment device 300 when the air pressure of the phosphorus furnace 100 does not reach the set threshold value, when the air pressure of the phosphorus furnace 100 suddenly rises, the flue gas filtration dust removal device 400 can be better protected by the flue gas overpressure protection device 200, and equipment damage, especially filter element damage, caused by the sudden rise of the air pressure of the flue gas filtration dust removal device 400 can be effectively avoided.

The filter cartridge used by the applicant prior to the filing date of CN103523762B, CN103508429B may be referred to as a "rigid cartridge" which is strong and resistant to high temperatures, but also costly to manufacture. Later, the applicant developed a flexible membrane cartridge that was made using flexible metal films to create a cloth-like structure that was not only resistant to high temperatures, but also significantly less costly to manufacture, and that was not as strong as a rigid cartridge. In the case of the above-described smoke overpressure protection device 200, a flexible membrane filter cartridge that is less costly to use is clearly more suitable.

The cylindrical container 210 in the flue gas overpressure protection device 200 has a certain buffering effect, and helps to reduce pressure fluctuation of the flue gas filtering dust removal device 400.

Since the water seal tank 240 has the closed space 241 and the open space 242 forming the communicating vessel, the bottom opening of the cylindrical container 210 is inserted below the liquid surface of the closed space 241, and the upper space of the liquid surface of the closed space in the water seal tank 240 is connected to the diffusing tower or the yellow phosphorus condensation recovery device 600 through the pipe 250, when the air pressure in the upper space is increased during the pressure relief of the flue gas overpressure protection device 200, the liquid surface of the closed space 241 is pushed to be lowered and the liquid surface of the open space 242 is raised (see fig. 10), so that the pressure in the upper space is prevented from being excessively increased, and the corresponding pressure relief rate is improved.

Therefore, the structure of the flue gas overpressure protection apparatus 200 is also helpful to minimize the influence on the flue gas filtering dust removal apparatus 400 when the air pressure of the phosphorus furnace 100 suddenly increases.

As shown in fig. 9 to 10, the water seal tank 240 has a lower tank body and an upper tank body, the upper tank body is installed in the lower tank body in a reverse manner through a connection member connected between the lower tank body and the upper tank body, a bottom passage and a side passage are reserved between the upper tank body and the lower tank body, so that the closed space is formed between the inside of the upper tank body and the bottom passage and the open space 242 is formed at the side passage. In addition, the water seal tank 240 is provided with an overflow port communicating with the upper portion of the open space 242, and overflows when the liquid level in the open space 242 rises to the overflow port.

Here, at least one function of the flue gas pretreatment apparatus 300 is to further reduce the influence of the air pressure fluctuation of the phosphorus furnace 100 on the flue gas filtering dust removal apparatus 400 by the buffering action of the air flow buffer, and to protect the phosphorus furnace 100 from the operation safety hazards. During the operation of the phosphorus furnace 100, a negative pressure (the phosphorus furnace 100 is specifically an electric furnace) is sometimes generated due to sudden collapse of the furnace charge, and the negative pressure may cause air to be sucked into the phosphorus furnace 100 to be in contact with yellow phosphorus to cause explosion, so that the airflow buffer can actually perform negative pressure protection on the phosphorus furnace 100, thereby cooperating with the flue gas overpressure protection device 200.

The flue gas pretreatment device 300 generally has a function of mechanically pre-dedusting yellow phosphorus flue gas. For example, the large particle dust in the yellow phosphorus flue gas is removed by utilizing natural principles such as gravity sedimentation, inertial separation and the like. Thus, if the flue gas pretreatment device 300 is viewed from the perspective of mechanical pre-dust removal, it may also be referred to as a mechanical dust remover.

The flue gas pretreatment device 300 can utilize a variety of different structures to achieve mechanical pre-dust removal. One simple implementation is to directly utilize the airflow buffer cylinder 310 to achieve gravity settling of the dust. In other embodiments, the mechanical pre-dust removal can be realized by referring to the related structures of mechanical dust removers such as a gravity dust remover, an inertial dust remover, a cyclone dust remover and the like. The bottom of the flue gas pretreatment device 300 is also typically provided with a discharge channel 330 for discharging dust.

The flue gas pretreatment device 300 can be further provided with a heat exchanger for heating yellow phosphorus flue gas, so that the phenomenon that the yellow phosphorus flue gas is separated out due to liquid yellow phosphorus caused by cooling before passing through the flue gas filtering and dust removing device 400, and then the inside of the flue gas filtering and dust removing device 400 and the inner wall of a related pipeline are adhered with yellow phosphorus and dust to cause blockage is avoided. In an alternative embodiment, the heat exchanger employs in particular an electric heater 320.

Generally, the flue gas filtering and dust removing device 400 comprises a dust remover cylinder 420, the filter element 410 is installed 430 in the dust remover cylinder 420 through a filter element installation plate and divides the dust remover cylinder into a lower raw air chamber 440 and an upper air purifying chamber 450, an air inlet for receiving yellow phosphorus flue gas to be filtered, dust removed and purified is arranged on the raw air chamber 440, an air outlet for outputting yellow phosphorus flue gas after filtering, dust removed and purified is arranged on the air purifying chamber 450, and a discharging channel 460 communicated with the raw air chamber 440 is arranged at the bottom of the dust remover cylinder 420.

In addition, in general, the flue gas filtering dust removal device 400 further includes a filter element blowback dust removal structure 470 for applying compressed gas from the clean air chamber 450 to the filter element 410 in a direction opposite to the filtering direction. Here, the compressed gas is typically nitrogen.

In a general embodiment, the filter element back-blowing ash removing structure 470 includes a compressed gas delivery pipe 471, and a part of the compressed gas delivery pipe 471 is located in the clean air chamber 450 in the dust collector cylinder 420 and is distributed with blowing openings corresponding to the output port of the filter element 410; another portion of the compressed gas delivery tube 471 is located outside the precipitator cylinder 420 and is connected to a compressed gas source via a first control valve 472. The compressed air source may employ an air bag 473.

In other embodiments, the filter cartridge blowback ash removal structure 470 may also employ blowback techniques such as venturi blowback.

In a general embodiment, the yellow phosphorus condensation recovery device 600 adopts more than 2 spray towers 620 which can be connected in parallel or in series, and the spray towers 620 directly spray cooling water with a certain temperature to the yellow phosphorus flue gas to convert the yellow phosphorus from a gas state to a liquid state, then store the yellow phosphorus into the yellow phosphorus tank 610 and output tail gas.

In a preferred embodiment, the yellow phosphorus condensation recovery apparatus 600 comprises M spray towers connected in series, wherein M is an integer greater than or equal to 2; and, the flue gas overpressure protection device 200 guides the yellow phosphorus flue gas into an nth spray tower according to the positive number of the flow direction of the yellow phosphorus flue gas in the yellow phosphorus condensation recovery device 600 when the air pressure of the yellow phosphorus flue gas reaches a set threshold, wherein N is an integer which is more than or equal to 2 and less than or equal to M.

In the preferred embodiment, since the M spray towers are connected in series, the spray towers have high overall yield of yellow phosphorus and the yellow phosphorus content in the tail gas is low. In addition, the smoke overpressure protection device 200 guides the yellow phosphorus smoke into the nth spray tower according to the positive number of the flow direction of the yellow phosphorus smoke in the yellow phosphorus condensation recovery device 600 when the air pressure of the yellow phosphorus smoke reaches the set threshold, wherein N is an integer which is more than or equal to 2 and less than or equal to M, so that the influence of the larger back pressure generated in the 1 st spray tower on the normal operation of the smoke filtering and dust removing device 400 can be avoided, and the yellow phosphorus condensation recovery device 600 can be conveniently and rapidly depressurized.

In other embodiments, the yellow phosphorus condensation recovery apparatus 600 may employ a dedicated phosphorus recovery apparatus such as that provided in patent document CN103708432B filed by the applicant for indirect condensation and recovery of yellow phosphorus.

Because impurities such as solid slag and yellow phosphorus are gradually generated in the water seal tank 240 of the flue gas overpressure protection device 200, the impurities can be accumulated at the bottom of the water seal tank 240, and accordingly, a discharging structure can be arranged at the bottom of the water seal tank 240 so as to discharge the impurities such as solid slag and yellow phosphorus from the bottom of the water seal tank 240.

In one embodiment, the bottom of the water seal tank 240 is provided with a slope, and the lowest part is provided with a discharge port, and the discharge port is connected to the middle tank 260 through a pipeline, so that impurities can be discharged into the middle tank 260 through the discharge port. The middle tank is filled with hot water, so that the yellow phosphorus can be kept in a liquid state, and the yellow phosphorus can be conveyed to a yellow phosphorus refining process.

The above-mentioned flue gas pretreatment device 300 and flue gas filtration dust removal device 400 both adopt the ash discharge device and ash discharge method similar to those in CN111359335A, i.e. the discharge channel 330 of the flue gas pretreatment device 300 and the discharge channel 460 of the flue gas filtration dust removal device 400 are respectively connected with the intermediate ash tank 481 through the discharge valve, and the intermediate ash tank 481 is connected with the storage tank 482 through the discharge valve. After the dust is discharged into the intermediate ash tank 481, a replacement gas (e.g., nitrogen gas) is introduced into the intermediate ash tank 481 to replace yellow phosphorus vapor in the dust, and then the dust in the intermediate ash tank 481 is discharged into the storage tank 482.

The tail gas from the yellow phosphorus condensation recovery device 600 contains a large amount of carbon monoxide, and is typically transported to a gas tank for storage for subsequent use. Another flue gas flow driving device (such as a water ring vacuum pump) can be arranged between the yellow phosphorus condensation recovery device 600 and the gas tank to suck the tail gas. In the case where the flue gas stream driving means is provided after the yellow phosphorus condensation recovery apparatus 600, the flue gas stream driving means 500 may be eliminated.

Fig. 2 is a schematic structural diagram of a yellow phosphorus flue gas purification system according to an embodiment of the present application. As shown in fig. 2, the yellow phosphorus flue gas purification system includes: the device comprises a flue gas overpressure protection device 200, a flue gas pretreatment device 300, a flue gas filtering and dust removing device 400, a flue gas flow driving device 500 and a yellow phosphorus condensation recovery device 600.

The flue gas pretreatment device 300 is disposed between the flue gas overpressure protection device 200 and the phosphorus furnace 100, and is configured to receive yellow phosphorus flue gas discharged from the phosphorus furnace 100, pretreat the yellow phosphorus flue gas, and then output pretreated yellow phosphorus flue gas.

The flue gas overpressure protection device 200 is configured to receive yellow phosphorus flue gas from the flue gas pretreatment device 300, and guide the yellow phosphorus flue gas to the diffusing tower or the yellow phosphorus condensation recovery device 600 when the air pressure of the yellow phosphorus flue gas reaches a set threshold, and to the flue gas filtering and dust removing device 400 when the air pressure of the yellow phosphorus flue gas does not reach the set threshold.

The flue gas filtering and dust removing device 400 is configured to receive yellow phosphorus flue gas from the flue gas pretreatment device 300 and passing through the flue gas overpressure protection device 200, physically intercept dust in the yellow phosphorus flue gas by the filter element 410 under a temperature condition that yellow phosphorus in the yellow phosphorus flue gas is still in a gaseous state, and then output yellow phosphorus flue gas after filtering, dust removing and purifying.

The flue gas flow driving device 500 is configured to receive the yellow phosphorus flue gas output from the flue gas filtering and dust removing device 400, and discharge the pressurized yellow phosphorus flue gas after increasing the pressure of the yellow phosphorus flue gas by using mechanical energy.

The smoke overpressure protection device 200 comprises a cylindrical container 210, wherein an opening at one side of the cylindrical container 210 is connected with the smoke pretreatment device 300 through a first vertical inclined pipe 220, an opening at the other side of the cylindrical container is connected with the smoke filtering and dust removing device 400 through a second vertical inclined pipe 230, and the opening at the bottom of the cylindrical container is inserted below the liquid level of the water seal groove 240.

The water seal tank 240 has a closed space 241 and an open space 242 which constitute a communicating vessel, the bottom opening of the cylindrical vessel 210 is inserted under the liquid surface of the closed space 241 (the depth of the inserted liquid surface is adapted to the above-mentioned set threshold value), and the upper space of the liquid surface of the closed space 241 in the water seal tank 240 is connected to the diffusing tower or the yellow phosphorus condensation recovery device 600 through a pipe 250.

The flue gas pretreatment device 300 comprises an air flow buffer, the air flow buffer is provided with an air flow buffer cylinder 310, an air flow buffer space is formed in the air flow buffer cylinder 310, and an air inlet for receiving yellow phosphorus flue gas from the phosphorus furnace 100 and an air outlet for outputting pretreated yellow phosphorus flue gas are arranged on the air flow buffer space.

The yellow phosphorus flue gas purification system shown in fig. 2 is different from the yellow phosphorus flue gas purification system shown in fig. 1 in that: the relative positions of the flue gas pre-treatment device 300 and the flue gas overpressure protection device 200 are interchanged. Since the flue gas pretreatment device 300 can mechanically pre-remove dust from yellow phosphorus flue gas, the yellow phosphorus flue gas purification system shown in fig. 2 helps to reduce the amount of solid slag generated in the water seal tank 240.

Fig. 3 is a schematic structural diagram of a yellow phosphorus flue gas purification system according to an embodiment of the present application. As shown in fig. 3, the yellow phosphorus flue gas purification system includes: the device comprises a flue gas overpressure protection device 200, a flue gas pretreatment device 300, a flue gas filtering and dust removing device 400, a flue gas flow driving device 500 and a yellow phosphorus condensation recovery device 600.

The flue gas pretreatment device 300 is disposed between the flue gas filtering and dust removing device 400 and the phosphorus furnace 100, and is configured to receive yellow phosphorus flue gas discharged from the phosphorus furnace 100, pretreat the yellow phosphorus flue gas, and then output pretreated yellow phosphorus flue gas.

The smoke overpressure protection device 200 is configured to receive yellow phosphorus smoke output by the smoke filtering and dust removing device 400, and bypass the smoke airflow driving device 500 to guide the yellow phosphorus smoke to a diffusing tower or the yellow phosphorus condensation recovery device 600 when the air pressure of the yellow phosphorus smoke reaches a set threshold, and cut off the bypass when the air pressure of the yellow phosphorus smoke does not reach the set threshold.

The flue gas overpressure protection device 200 comprises a drainage tube 260, one end of the drainage tube 260 is connected with the flue gas filtering and dust removing device 400, the other end of the drainage tube 260 is inserted under the liquid surface of the water seal tank 240 (the depth of the insertion under the liquid surface is adapted to the set threshold value), and the upper space of the liquid surface in the water seal tank 240 is connected with the diffusing tower or the yellow phosphorus condensation recovery device 600 through a pipeline 250.

Preferably, the water seal tank 240 has a closed space 241 and an open space 242 which form a communicating vessel, the bottom opening of the cylindrical vessel 210 is inserted under the liquid surface of the closed space 241 (the depth of the inserted liquid surface is adapted to the above set threshold value), and the upper space of the liquid surface of the closed space 241 in the water seal tank 240 is connected to the diffusing tower or the yellow phosphorus condensation recovery device 600 through a pipe 250.

The main difference between the yellow phosphorus flue gas purification system shown in fig. 3 and the yellow phosphorus flue gas purification system shown in fig. 1-2 is that: the flue gas overpressure protection device 200 and the flue gas flow driving device 500 are arranged in parallel between the flue gas filtering and dust removing device 400 and the yellow phosphorus condensation recovery device 600.

The yellow phosphorus flue gas purification system shown in fig. 3 has advantages over the yellow phosphorus flue gas purification systems shown in fig. 1-2 in that: first, the yellow phosphorus flue gas passing through the water seal tank 240 is the yellow phosphorus flue gas filtered and dedusted by the flue gas filtering and dedusting device 400, so that the amount of solid slag generated in the water seal tank 240 is small, the purity of the yellow phosphorus in the water seal tank 240 is higher, and the yellow phosphorus can be directly subjected to fine treatment. Second, the flue gas pretreatment device 300 and the flue gas filtering and dust removing device 400 are close to the phosphorus furnace 100, so that the liquid yellow phosphorus can be more effectively prevented from being separated out before the yellow phosphorus flue gas enters the flue gas filtering and dust removing device 400.

Fig. 4 is a schematic structural diagram of a yellow phosphorus flue gas purification system according to an embodiment of the present application. As shown in fig. 4, the yellow phosphorus flue gas purification system includes: the device comprises a flue gas overpressure protection device 200, a flue gas pretreatment device 300, a flue gas filtering and dust removing device 400, a flue gas flow driving device 500 and a yellow phosphorus condensation recovery device 600.

The water seal tank 240 has a closed space 241 and an open space 242 which constitute a communicating vessel, the bottom opening of the cylindrical container 210 is inserted below the liquid surface of the closed space 241, and the upper space of the liquid surface of the closed space 241 in the water seal tank 240 is connected to the diffusing tower or the yellow phosphorus condensation recovery apparatus 600 through a pipe 250.

In addition, the flue gas pretreatment device 300 comprises an air flow buffer and a water seal tank 340, the air flow buffer is provided with an air flow buffer cylinder 310, an air flow buffer space is formed in the air flow buffer cylinder 310, an air inlet for receiving yellow phosphorus flue gas from the flue gas overpressure protection device 200 and an air outlet for outputting pretreated yellow phosphorus flue gas are arranged on the air flow buffer space, a discharging channel communicated with the air flow buffer space is arranged at the bottom of the air flow buffer cylinder 310, and the bottom opening of the discharging channel is inserted below the liquid surface of the water seal tank 340. The water seal tank 340 is sealed by hot water with the temperature of 30-70 ℃, preferably 40-60 ℃, the depth of the bottom opening of the discharging channel inserted below the liquid level of the water seal tank 340 is ensured to ensure that the water seal tank 340 can maintain a water seal state all the time, and the bottom of the water seal tank 340 is provided with a discharging structure 341.

In addition, the flue gas filtering dust removing device 400 comprises a dust remover cylinder 420 and a water seal tank 470, the filter element 410 is installed 430 in the dust remover cylinder 420 through a filter element installing plate and divides the dust remover cylinder into a lower raw air chamber 440 and an upper air purifying chamber 450, an air inlet for receiving yellow phosphorus flue gas to be filtered, dust removed and purified is arranged on the raw air chamber 440, an air outlet for outputting yellow phosphorus flue gas after filtering, dust removed and purified is arranged on the air purifying chamber 450, a discharging channel 460 communicated with the raw air chamber 440 is arranged at the bottom of the dust remover cylinder 420, and the bottom opening of the discharging channel 460 is inserted below the liquid surface of the water seal tank 470. The water seal tank 470 is sealed by hot water with the temperature of 30-70 ℃, preferably 40-60 ℃, the bottom opening of the discharging channel is inserted to a depth below the liquid level of the water seal tank 470, so that the water seal tank 470 can maintain a water seal state all the time, and the bottom of the water seal tank 470 is provided with a discharging structure 471.

Compared with the yellow phosphorus flue gas purification system shown in fig. 1-3, the yellow phosphorus flue gas purification system shown in fig. 4 is designed for discharging dust in the flue gas pretreatment device 300 and the flue gas filtering and dust removing device 400, and a structure that a discharging channel is inserted below the liquid level of a water seal groove is designed, so that the structure is greatly simplified compared with a two-stage ash discharging mode. Dust discharged through the discharging channel can sink below the liquid level of the corresponding water seal tank, so that yellow phosphorus carried in the dust is prevented from contacting with air, and the dust and condensed yellow phosphorus are discharged through the discharging structure.

On the basis of the yellow phosphorus flue gas purification system, the flue gas pretreatment device 300 and/or the flue gas filtering and dust removing device 400 comprise an on-off control mechanism for switching the corresponding discharging channel between an on state and an off state.

The opening and closing control mechanism can be an opening and closing control mechanism which can be automatically switched between an opening state and a closing state according to the pressure of a material to be discharged in the discharging channel on the opening and closing control mechanism; when the pressure of the material to be discharged in the discharging channel to the opening and closing control mechanism reaches a set condition, the opening and closing control mechanism is opened, and when the pressure does not reach the set condition, the opening and closing control mechanism is closed.

Optionally, the opening and closing control mechanism comprises a turnover plate installed in the unloading channel through a damping mechanism, when the pressure of the material to be unloaded in the unloading channel to the turnover plate exceeds the turnover resistance applied to the turnover plate by the damping mechanism, the turnover plate turns over to open the unloading channel, and when the pressure of the material to be unloaded in the unloading channel to the turnover plate does not exceed the turnover resistance applied to the turnover plate by the damping mechanism, the turnover plate closes the unloading channel.

Fig. 5 is a schematic structural diagram of a yellow phosphorus flue gas purification system according to an embodiment of the present application. As shown in fig. 5, the yellow phosphorus flue gas purification system includes: a flue gas pretreatment device 300, a flue gas filtering and dust removing device 400, a flue gas flow driving device 500 and a yellow phosphorus condensation recovery device 600.

The flue gas pretreatment device 300 is disposed between the phosphorus furnace 100 and the flue gas filtering and dust removing device 400, and is configured to receive yellow phosphorus flue gas from the phosphorus furnace 100, pretreat the yellow phosphorus flue gas, and then output pretreated yellow phosphorus flue gas.

The flue gas pretreatment device 300 comprises an air flow buffer and a water seal tank 340, the air flow buffer is provided with an air flow buffer cylinder 310, an air flow buffer space is formed in the air flow buffer cylinder 310, an air inlet for receiving yellow phosphorus flue gas from the flue gas overpressure protection device 200 and an air outlet for outputting pretreated yellow phosphorus flue gas are arranged in the air flow buffer space, a discharging channel communicated with the air flow buffer space is arranged at the bottom of the air flow buffer cylinder 310, and an opening at the bottom of the discharging channel is inserted below the liquid surface of the water seal tank 340. The water seal tank 340 is sealed by hot water with the temperature of 30-70 ℃, preferably 40-60 ℃, and the bottom of the water seal tank 340 is provided with a discharging structure 341.

Further, as shown in fig. 11, the water seal tank 340 has a closed space 241 and an open space 242 constituting a communicating vessel, the bottom opening of the discharging passage is inserted below the liquid surface of the closed space 241, and the upper space of the liquid surface of the closed space 241 in the water seal tank 340 is connected to the diffusing tower or the yellow phosphorus condensing and recovering device 600 through a pipe 250.

The flue gas filtering dust removal device 400 comprises a dust remover cylinder 420 and a water seal tank 470, the filter element 410 is arranged in the dust remover cylinder 420 through a filter element mounting plate 430 and divides the dust remover cylinder into a lower original air chamber 440 and an upper air purifying chamber 450, an air inlet for receiving yellow phosphorus flue gas to be filtered, dust removed and purified is arranged on the original air chamber 440, an air outlet for outputting yellow phosphorus flue gas after filtering, dust removed and purified is arranged on the air purifying chamber 450, a discharging channel 460 communicated with the original air chamber 440 is arranged at the bottom of the dust remover cylinder 420, and the bottom opening of the discharging channel 460 is inserted below the liquid surface of the water seal tank 470. The water seal tank 470 is sealed by hot water with the temperature of 30-70 ℃, preferably 40-60 ℃, and the depth of the bottom opening of the discharging channel inserted below the liquid level of the water seal tank 470 is enough to ensure that the water seal tank 470 can maintain the water seal state all the time, and the bottom of the water seal tank 470 is provided with a discharging structure 471.

Compared with the yellow phosphorus flue gas purification system shown in fig. 4, the yellow phosphorus flue gas purification system shown in fig. 5 omits the flue gas overpressure protection device 200 which is originally independent of the flue gas pretreatment device 300, and directly improves the water seal tank 340 of the flue gas pretreatment device 300 into the flue gas overpressure protection device, so that the dust unloading function of the flue gas pretreatment device 300 and the function of the flue gas overpressure protection device are realized.

When the water seal tank 340 of the flue gas pretreatment device 300 is modified into a flue gas overpressure protection device, the depth of the bottom opening of the discharging channel of the air flow buffer inserted below the liquid level of the enclosed space 241 should be controlled to be at a proper depth, so that when the air pressure of yellow phosphorus flue gas in the air flow buffer reaches a set threshold value, pressure relief is realized through the water seal tank 340.

Fig. 6 is a schematic structural diagram of a yellow phosphorus flue gas purification system according to an embodiment of the present application. As shown in fig. 6, the yellow phosphorus flue gas cleaning system includes: a flue gas pretreatment device 300, a flue gas filtering and dust removing device 400, a flue gas flow driving device 500 and a yellow phosphorus condensation recovery device 600.

The flue gas pretreatment device 300 comprises an air flow buffer and a water seal tank 340, the air flow buffer is provided with an air flow buffer cylinder 310, an air flow buffer space is formed in the air flow buffer cylinder 310, an air inlet for receiving yellow phosphorus flue gas from the flue gas overpressure protection device 200 and an air outlet for outputting pretreated yellow phosphorus flue gas are arranged in the air flow buffer space, a discharging channel communicated with the air flow buffer space is arranged at the bottom of the air flow buffer cylinder 310, and an opening at the bottom of the discharging channel is inserted below the liquid surface of the water seal tank 340. The water seal tank 340 is sealed by hot water with the temperature of 30-70 ℃, preferably 40-60 ℃, the depth of the bottom opening of the discharging channel inserted below the liquid level of the water seal tank 340 is ensured to ensure that the water seal tank 340 can maintain a water seal state all the time, and the bottom of the water seal tank 340 is provided with a discharging structure 341.

The flue gas filtering dust removal device 400 comprises a dust remover cylinder 420 and a water seal tank 470, the filter element 410 is arranged in the dust remover cylinder 420 through a filter element mounting plate 430 and divides the dust remover cylinder into a lower original air chamber 440 and an upper air purifying chamber 450, an air inlet for receiving yellow phosphorus flue gas to be filtered, dust removed and purified is arranged on the original air chamber 440, an air outlet for outputting yellow phosphorus flue gas after filtering, dust removed and purified is arranged on the air purifying chamber 450, a discharging channel 460 communicated with the original air chamber 440 is arranged at the bottom of the dust remover cylinder 420, and the bottom opening of the discharging channel 460 is inserted below the liquid surface of the water seal tank 470. The water seal tank 470 is sealed by hot water with the temperature of 30-70 ℃, preferably 40-60 ℃, and a discharging structure 471 is arranged at the bottom of the water seal tank 470.

In addition, the water seal tank 470 has a closed space 241 and an open space 242 constituting a communicating vessel, the bottom opening of the discharging passage is inserted below the liquid surface of the closed space 241, and the upper space of the liquid surface of the closed space 241 in the water seal tank 340 is connected to the diffusing tower or the yellow phosphorus condensing and recovering device 600 through a pipe 250.

Compared with the yellow phosphorus flue gas purification system shown in fig. 4, the yellow phosphorus flue gas purification system shown in fig. 6 omits the flue gas overpressure protection device 200 which is originally independent of the flue gas pretreatment device 300 and the flue gas filtration and dust removal device 400, and directly improves the water seal groove 470 of the flue gas filtration and dust removal device 400 into the flue gas overpressure protection device, so that the dust unloading function of the flue gas filtration and dust removal device 400 and the function of the flue gas overpressure protection device are realized.

When the water seal groove 470 of the flue gas filtering and dust removing device 400 is modified to be a flue gas overpressure protection device, the depth of the bottom opening of the discharging channel of the flue gas filtering and dust removing device 400, which is inserted below the liquid level of the enclosed space 241, should be controlled to be at a proper depth, so that when the air pressure of yellow phosphorus flue gas in the air flow buffer reaches a set threshold value, pressure relief is realized through the water seal groove 470.

Fig. 7 is a schematic structural diagram of a yellow phosphorus flue gas purification system according to an embodiment of the present application. The yellow phosphorus flue gas purification system shown in fig. 7 improves the structure of the flue gas pretreatment device 300 on the basis of the yellow phosphorus flue gas purification system shown in fig. 1. Fig. 12 is an engineering structure diagram of a flue gas pretreatment device according to an embodiment of the present application. The flue gas pretreatment device 300 in the yellow phosphorus flue gas purification system shown in fig. 7 adopts the flue gas pretreatment device shown in fig. 12.

As shown in fig. 7 and 12, the air flow damper has an air inlet section 311, a reducing shrinkage section 312, a reducing expansion section 313 and an air outlet section 314 which are sequentially arranged from bottom to top, the air inlet is arranged on the air inlet section 311, the air outlet is arranged on the air outlet section 314, and an electric heater 320 is installed in the air outlet section 314 and is arranged opposite to the outlet of the reducing expansion section 313.

When the airflow buffer operates, the flow speed is increased by the venturi effect when the airflow passes through the reducing shrinkage section 312 and the reducing expansion section 313, so that a certain airflow impact effect is achieved on dust on the electric heater 320, pollutants such as dust attached to the electric heater 320 are reduced, and the problem of the reduction of the heat exchange efficiency of the electric heater 320 is solved. In addition, since the flow rate of the air flow increases, the time for the air flow to pass through the electric heater 320 becomes short, and the conversion of yellow phosphorus into red phosphorus can be effectively prevented.

Typically, the reducing shrinkage section 312 and the reducing expansion section 313 are connected by a connecting neck 315, so as to facilitate manufacturing.

In addition, as shown in fig. 12, the diameter of the exhaust section 314 is smaller than the diameter of the intake section 311, and the volume of the exhaust section 314 is also significantly smaller than the volume of the intake section 311, thus further ensuring a rapid flow of air through the exhaust section 314.

The yellow phosphorus flue gas cleaning system shown in fig. 7 may also improve the discharge structure (ash discharging device) and the discharge manner of the flue gas pretreatment device 300 and/or the flue gas filtering dust removal device 400 with reference to the above-described embodiments.

Fig. 8 is a schematic structural diagram of a yellow phosphorus flue gas purification system according to an embodiment of the present application. The yellow phosphorus gas cleaning system shown in fig. 8 improves the related structure of the gas filtering dust-removing device 400 on the basis of the yellow phosphorus gas cleaning system shown in fig. 1.

As shown in fig. 8, the flue gas filtering and dust removing device 400 is provided with a filter core regeneration liquid cleaning structure, a regeneration liquid discharging structure and a dust remover drying structure. Wherein the filter element regeneration liquid cleaning structure is used for providing the filter element 410 with regeneration liquid capable of cleaning pollutants on the filter element 410; the regeneration liquid discharge structure is arranged at the bottom of the dust remover cylinder 420 and is communicated with the lower part of the original air chamber; the dust remover drying structure is used for drying the inside of the dust remover cylinder 420. Here, the regeneration liquid may be hot water.

Thus, the flue gas filtering and dust removing device 400 can realize the following filter element regeneration method: firstly, closing air inlet of yellow phosphorus flue gas to be filtered; then, providing the regeneration fluid to the filter element 410 through the filter element regeneration fluid cleaning structure; discharging the regeneration liquid out of the precipitator cylinder 420 through the regeneration liquid discharge structure; the inside of the dust remover cylinder 420 is dried by the dust remover drying structure. The regeneration mode is simpler, more convenient and safer. The regeneration mode is not only suitable for the smoke filtering and dust removing device of yellow phosphorus smoke, but also suitable for the smoke filtering and dust removing device of coal gas containing tar.

Optionally, the filter cartridge regenerant cleaning configuration provides the regenerant to the filter cartridge 410 via the filter cartridge blowback ash configuration 470. Specifically, the filter element regeneration liquid cleaning structure includes a regeneration liquid delivery pipe 474, one end of the regeneration liquid delivery pipe 474 is connected to the compressed gas delivery pipe 471 through a second control valve, and the other end of the regeneration liquid delivery pipe 474 is connected to a regeneration liquid supply facility.

Optionally, the flue gas filtering dust removal device 400 includes a cartridge steam cleaning structure for providing steam to the cartridge 410 that cleans contaminants on the cartridge. Optionally, a cartridge vapor purge configuration provides the vapor to the cartridge 410 through the cartridge blowback ash configuration 470. Specifically, the filter element steam cleaning structure comprises a steam delivery pipe 475, one end of the steam delivery pipe 475 is connected with the compressed gas delivery pipe 471 through a third control valve, and the other end of the steam delivery pipe 475 is connected with a steam supply facility.

Thus, the filter element 410 can be provided with water vapor capable of cleaning pollutants (mainly a mixture of yellow phosphorus and dust) on the filter element through the filter element steam cleaning structure, and the water vapor can melt the yellow phosphorus on the filter element 410, so that the liquid yellow phosphorus carries dust to be separated from the filter element 410. Then, the regeneration liquid (hot water) for cleaning the contaminants on the filter element 410 is supplied to the filter element 410 through the filter element regeneration liquid cleaning structure, so that the contaminants on the filter element 410 can be thoroughly cleaned. The filter element steam cleaning structure and the filter element regeneration liquid cleaning structure are combined for use, so that the use amount of regeneration liquid (hot water) can be saved.

The regeneration liquid discharging structure can directly utilize the discharging structure (ash discharging device) at the bottom of the flue gas filtering and dust removing device 400, so that the discharging channel 460, the discharging valve, the middle ash tank 481 and the storage tank 482 can be cleaned by water vapor and hot water.

Optionally, the dust collector drying structure includes a drying gas circulation loop 700 located outside the dust collector cylinder 420 and connected between the air inlet structure and the air outlet structure of the flue gas filtering dust collector 400, and the drying gas circulation loop 700 is provided with a drying gas heating device and may be connected with a drying gas supplementing pipeline. The drying gas can be nitrogen.

Specifically, the air inlet of the air flow buffer is connected with the air inlet structure through a pipeline, the exhaust structure is connected with the air inlet of the air flow buffer through a pipeline, and a circulating fan 710 is arranged on the pipeline between the exhaust structure and the air inlet of the air flow buffer, so that the drying air circulation loop is formed. Since the air flow buffer is provided with the electric heater 320, the electric heater 320 is used as a drying air heating device.

The interior of the dust collector cylinder 420 can be quickly dried through the drying air circulation loop 700, and the air flow buffer and the pipeline between the air flow buffer and the flue gas filtering dust collector 400 can be preheated, so that yellow phosphorus paste pipes can not be caused when the dust collector is restarted later.

The content of the present application is described above. Those of ordinary skill in the art will be able to implement the application based on these descriptions. Based on the foregoing specification, all other embodiments that may be obtained by one of ordinary skill in the art without making any inventive effort are intended to be within the scope of patent protection.

Claims

1. Yellow phosphorus flue gas clean system, its characterized in that includes:

The smoke overpressure protection device is used for receiving yellow phosphorus smoke discharged by the phosphorus furnace, guiding the yellow phosphorus smoke to the diffusing tower or the yellow phosphorus condensation recovery device when the air pressure of the yellow phosphorus smoke reaches a set threshold value, and guiding the yellow phosphorus smoke to the smoke filtering and dust removing device when the air pressure of the yellow phosphorus smoke does not reach the set threshold value;

the smoke filtering and dust removing device is used for receiving the yellow phosphorus smoke from the smoke overpressure protection device, physically intercepting dust in the yellow phosphorus smoke through the filter element under the temperature condition that the yellow phosphorus in the yellow phosphorus smoke is still in a gaseous state, and then outputting the yellow phosphorus smoke after filtering, dust removing and purifying;

The yellow phosphorus condensation recovery device is used for receiving the yellow phosphorus flue gas from the flue gas filtering and dust removing device, directly or indirectly condensing the yellow phosphorus flue gas through a cooling medium, converting the yellow phosphorus from a gas state to a liquid state, then storing the yellow phosphorus in a yellow phosphorus tank, and outputting tail gas;

The smoke overpressure protection device comprises a cylindrical container, wherein an opening at one side of the cylindrical container is connected with the phosphorus furnace through a first vertical inclined pipe, an opening at the other side of the cylindrical container is connected with the smoke filtering and dust removing device through a second vertical inclined pipe, and the opening at the bottom of the cylindrical container is inserted below the liquid level of the water seal groove;

The water seal tank is provided with a closed space and an open space which form a communicating vessel, the bottom opening of the cylindrical container is inserted below the liquid level of the closed space, and the upper space of the liquid level of the closed space in the water seal tank is connected with the diffusing tower or the yellow phosphorus condensation recovery device through a pipeline;

The water seal tank is provided with a lower tank body and an upper tank body, the upper tank body is arranged in the lower tank body in an inverted manner through a connecting piece connected between the lower tank body and the upper tank body, a bottom channel and a side channel are reserved between the upper tank body and the lower tank body, so that a closed space is formed between the inner part of the upper tank body and the bottom channel, and an open space is formed between the side channel;

And an overflow port communicated with the upper part of the open space is arranged on the water seal groove, and overflow is realized when the liquid level in the open space rises to the overflow port.

2. The yellow phosphorus flue gas cleaning system of claim 1, wherein:

The device comprises a flue gas pretreatment device, a flue gas filtration and dust removal device and a dust removal device, wherein the flue gas pretreatment device is arranged between the flue gas overpressure protection device and the flue gas filtration and dust removal device and is used for receiving yellow phosphorus flue gas from the flue gas overpressure protection device, pretreating the yellow phosphorus flue gas and outputting pretreated yellow phosphorus flue gas;

The smoke filtering and dust removing device is used for receiving yellow phosphorus smoke from the smoke pretreatment device, physically intercepting dust in the yellow phosphorus smoke through the filter element under the temperature condition that yellow phosphorus in the yellow phosphorus smoke is still in a gaseous state, and then outputting yellow phosphorus smoke after filtering, dust removing and purifying;

the flue gas pretreatment device comprises an air flow buffer, the air flow buffer is provided with an air flow buffer cylinder, an air flow buffer space is formed in the air flow buffer cylinder, and an air inlet for receiving yellow phosphorus flue gas from the flue gas overpressure protection device and an air outlet for outputting pretreated yellow phosphorus flue gas are arranged in the air flow buffer space.

3. The yellow phosphorus flue gas cleaning system of claim 1, wherein:

the device comprises a flue gas pretreatment device, a gas discharge device and a gas discharge device, wherein the flue gas pretreatment device is arranged between the flue gas overpressure protection device and the phosphorus furnace and is used for receiving yellow phosphorus flue gas discharged by the phosphorus furnace, pretreating the yellow phosphorus flue gas and outputting pretreated yellow phosphorus flue gas;

The smoke overpressure protection device is used for receiving yellow phosphorus smoke from the smoke pretreatment device, guiding the yellow phosphorus smoke to a diffusing tower or a yellow phosphorus condensation recovery device when the air pressure of the yellow phosphorus smoke reaches a set threshold value, and guiding the yellow phosphorus smoke to a smoke filtering and dust removing device when the air pressure of the yellow phosphorus smoke does not reach the set threshold value;

4. A yellow phosphorus flue gas cleaning system according to claim 2 or claim 3 and wherein: the air flow buffer is provided with an air inlet section, a reducing shrinkage section, a reducing expansion section and an exhaust section which are sequentially arranged from bottom to top, the air inlet is arranged on the air inlet section, and the exhaust port is arranged on the exhaust section; the flue gas pretreatment device further comprises an electric heater which is arranged in the exhaust section and is opposite to the outlet of the reducing expansion section.

5. A yellow phosphorus flue gas cleaning system according to claim 2 or claim 3 and wherein: the bottom of the air flow buffer cylinder body is provided with a discharging channel communicated with the air flow buffer space;

The flue gas pretreatment device further comprises a water seal tank, the discharging channel is inserted below the liquid level of the water seal tank, and a discharging structure is arranged at the bottom of the water seal tank.

6. The yellow phosphorus flue gas cleaning system of claim 1, wherein: the flue gas filtering dust removal device comprises a dust remover cylinder body, the filter element is arranged in the dust remover cylinder body through a filter element mounting plate and divides the dust remover cylinder body into a lower original air chamber and an upper air purifying chamber, an air inlet for receiving yellow phosphorus flue gas to be filtered, dedusted and purified is arranged on the original air chamber, an air outlet for outputting the yellow phosphorus flue gas after filtering, dedusting and purifying is arranged on the air purifying chamber, and a discharging channel communicated with the original air chamber is arranged at the bottom of the dust remover cylinder body.

7. The yellow phosphorus flue gas cleaning system of claim 6, wherein: the smoke filtering and dedusting device further comprises a water seal tank, the discharging channel is directly inserted below the liquid level of the water seal tank, and a discharging structure is arranged at the bottom of the water seal tank.

8. The yellow phosphorus flue gas cleaning system of claim 1, wherein: the yellow phosphorus condensation recovery device comprises more than 2 spray towers which are connected in series or in parallel, and the spray towers directly spray cooling liquid to the yellow phosphorus flue gas so as to condense the yellow phosphorus flue gas, so that the yellow phosphorus is converted into liquid from gas and then is stored in a yellow phosphorus tank at the bottom of the spray towers.

9. The yellow phosphorus flue gas cleaning system of claim 8, wherein: the yellow phosphorus condensation recovery device comprises M spray towers which are connected in series, wherein M is an integer more than or equal to 2;

And the smoke overpressure protection device guides the yellow phosphorus smoke into an Nth spray tower in the yellow phosphorus condensation recovery device according to the positive number of the flow direction of the yellow phosphorus smoke when the air pressure of the yellow phosphorus smoke reaches a set threshold, wherein N is an integer which is more than or equal to 2 and less than or equal to M.

10. Industrial kiln gas cleaning device, its characterized in that includes:

The smoke overpressure protection device is used for receiving smoke discharged by the industrial kiln and guiding the smoke to a diffusing tower or subsequent equipment of the smoke filtering and dust removing device when the air pressure of the smoke reaches a set threshold value, and guiding the smoke to the smoke filtering and dust removing device when the air pressure of the smoke does not reach the set threshold value; and

The flue gas filtering and dust removing device is used for receiving the flue gas from the flue gas overpressure protection device, physically intercepting dust in the flue gas through the filter element, and then outputting the flue gas after filtering, dust removing and purifying;

The smoke overpressure protection device comprises a cylindrical container, wherein an opening at one side of the cylindrical container is connected with the industrial kiln through a pipeline, an opening at the other side of the cylindrical container is connected with the smoke filtering and dust removing device through a pipeline, and the bottom opening is inserted below the liquid level of the liquid seal groove;

The liquid seal tank is provided with a closed space and an open space which form a communicating vessel, the bottom opening of the cylindrical container is inserted below the liquid level of the closed space, and the upper space of the liquid level of the closed space in the liquid seal tank is connected with the diffusing tower or the subsequent equipment of the flue gas filtering and dust removing device through a pipeline;

The liquid seal tank is provided with a lower tank body and an upper tank body, wherein the upper tank body is arranged in the lower tank body in an inverted manner through a connecting piece connected between the lower tank body and the upper tank body, a bottom channel and a side channel are reserved between the upper tank body and the lower tank body, so that a closed space is formed between the inner part of the upper tank body and the bottom channel, and an open space is formed between the side channel;

And an overflow port communicated with the upper part of the open space is arranged on the liquid seal groove, and overflow is realized when the liquid level in the open space rises to the overflow port.