CN211739913U - Flue gas waste heat utilization system - Google Patents

Abstract

The utility model relates to a flue gas waste heat utilization system belongs to flue gas waste heat utilization technical field, include the former flue and the chimney that set up in order along flue gas flow direction, be equipped with former flue stop valve on the former flue, still include the auxiliary flue parallelly connected with former flue, auxiliary flue is used for blast furnace gas desulfurization catalyst's regeneration, and auxiliary flue is provided with smoke temperature adjusting device, catalyst regeneration tower and draught fan along flue gas flow direction in order. The utility model discloses a setting is used for blast furnace gas desulfurization catalyst regenerative auxiliary flue, has realized the recycle of flue gas waste heat, does benefit to the energy saving and emission reduction of enterprise, has improved the utilization ratio of the energy.

Description

Flue gas waste heat utilization system

Technical Field

The utility model belongs to the technical field of flue gas waste heat utilization, a flue gas waste heat utilization system is related to.

Background

In the steelmaking production of the electric arc furnace, a large amount of waste heat of combustion waste gas is wasted along with the quenching of flue gas, water resources are wasted, and the power consumption of a fan is increased. At present, a plurality of enterprises have small steam demand, high saturated steam power generation investment and low electricity price, which leads to low profit. In addition, the requirement of ultra-clean discharge of iron and steel enterprises is rather compelled to start to carry out desulfurization on blast furnace gas, at present, most of desulfurization is carried out by adopting catalysts such as activated carbon for adsorption, and the adsorbed activated carbon needs thermal regeneration. By combining the requirement of the regeneration of the blast furnace gas desulfurization catalyst on heat, the flue gas of the electric furnace can be recycled, and an effective way is provided for further realizing energy conservation and emission reduction of iron and steel enterprises.

SUMMERY OF THE UTILITY MODEL

In view of this, the application aims to provide a flue gas waste heat utilization system, which realizes the recycling of flue gas waste heat by arranging an auxiliary flue for the regeneration of a blast furnace gas desulfurization catalyst, is beneficial to the energy conservation and emission reduction of enterprises, and improves the utilization rate of energy.

In order to achieve the above purpose, the utility model provides a following technical scheme:

the utility model provides a flue gas waste heat utilization system, includes former flue and the chimney that sets up in order along flue gas flow direction, be equipped with former flue stop valve on the former flue, still include the auxiliary flue parallelly connected with former flue, auxiliary flue is used for the regeneration of blast furnace gas desulfurization catalyst, auxiliary flue is provided with smoke temperature adjusting device, catalyst regeneration tower and draught fan along flue gas flow direction in order.

Optionally, the original flue is a low temperature flue.

Optionally, the device further comprises a bypass flue connected with the auxiliary flue in parallel, the bypass flue is a high-temperature flue, and a bypass flue stop valve is arranged on the bypass flue.

Optionally, the bypass flue shutoff valve is a quick-opening valve.

Optionally, an auxiliary flue adjusting valve for adjusting the flow of flue gas is further arranged on the auxiliary flue, and the auxiliary flue adjusting valve is arranged on an air inlet pipeline of the flue gas temperature adjusting device.

Optionally, an auxiliary flue stop valve is further arranged on the auxiliary flue.

Optionally, the smoke temperature adjusting device comprises a mixed air adjusting valve and a combustion nozzle.

The beneficial effects of the utility model reside in that:

1. the utility model discloses can realize effectively retrieving the electric stove flue gas waste heat undulant by a wide margin, when reducing the thermal pollution to the surrounding environment, provide an effectual approach for further realizing that the energy saving and emission reduction of iron and steel enterprise reduces.

2. The utility model discloses an utilize blast furnace flue gas waste heat to come regenerated catalyst, reduced blast furnace gas desulfurization's technology cost, realized resource cyclic utilization's purpose.

Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention. The objectives and other advantages of the invention may be realized and attained by the means of the instrumentalities and/or combinations particularly pointed out in the appended claims.

Drawings

For the purposes of promoting a better understanding of the objects, features and advantages of the invention, reference will now be made to the following detailed description taken in conjunction with the accompanying drawings in which:

fig. 1 is a schematic diagram of a flue gas waste heat utilization system.

Reference numerals: the device comprises an auxiliary flue stop valve 1, an induced draft fan 2, a catalyst regeneration tower 3, a smoke temperature adjusting device 4, an auxiliary flue adjusting valve 5, an auxiliary flue 6, a bypass flue 7, an original flue 8, a bypass flue stop valve 9, an original flue stop valve 10, a chimney 11 and a main flue 12.

Detailed Description

The following description of the embodiments of the present invention is provided for illustrative purposes, and other advantages and effects of the present invention will be readily apparent to those skilled in the art from the disclosure herein. The present invention can also be implemented or applied through other different specific embodiments, and various details in the present specification can be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the drawings provided in the following embodiments are only for illustrating the basic idea of the present invention, and the features in the following embodiments and examples may be combined with each other without conflict.

Wherein the showings are for the purpose of illustrating the invention only and not for the purpose of limiting the same, and in which there is shown by way of illustration only and not in any way limiting the scope of the invention; for a better understanding of the embodiments of the present invention, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the size of an actual product; it will be understood by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted.

The same or similar reference numerals in the drawings of the embodiments of the present invention correspond to the same or similar parts; in the description of the present invention, it should be understood that if there are terms such as "upper", "lower", "left", "right", "front", "back", etc., indicating directions or positional relationships based on the directions or positional relationships shown in the drawings, it is only for convenience of description and simplification of description, but it is not intended to indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore, the terms describing the positional relationships in the drawings are only used for illustrative purposes and are not to be construed as limiting the present invention, and those skilled in the art can understand the specific meanings of the terms according to specific situations.

Referring to fig. 1, a flue gas waste heat utilization system comprises an original flue 8 and a chimney 11 which are sequentially arranged along a flue gas flowing direction, wherein an original flue stop valve 10 is arranged on the original flue 8, the flue gas waste heat utilization system also comprises an auxiliary flue 6 which is connected with the original flue 8 in parallel, the auxiliary flue 6 is used for regenerating a blast furnace gas desulfurization catalyst, and the auxiliary flue 6 is sequentially provided with a flue gas temperature adjusting device 4, a catalyst regeneration tower 3, an induced draft fan 2 and an auxiliary flue stop valve 1 along the flue gas flowing direction.

The original flue 8 of the utility model can be a low temperature flue or a high temperature flue; when being the low temperature flue, the utility model discloses still be equipped with the bypass flue 7 parallelly connected with auxiliary flue 6, bypass flue 7 is the high temperature flue, is equipped with bypass flue stop valve 9 on the bypass flue 7.

When the auxiliary flue 6 breaks down, in order to realize opening fast of bypass flue 7, the utility model discloses a bypass flue stop valve 9 has the function of opening soon for opening the valve soon.

Adjust the flue gas velocity of flow of bypass flue 7 in order to realize, the utility model discloses a be equipped with the supplementary flue governing valve 5 that is used for adjusting flue gas flow on supplementary flue 6, supplementary flue governing valve 5 is established on the intake pipe way of gas temperature adjusting device 4.

The utility model discloses a theory of operation does: the original flue stop valve 10 and the bypass flue stop valve 9 are both in a normally closed state, the auxiliary flue regulating valve 5 and the auxiliary flue stop valve 1 are both in a normally open state, waste flue gas generated by combustion of the electric furnace enters the auxiliary flue 6 from the main flue 12 after being purified, sequentially passes through the auxiliary flue regulating valve 5, the flue gas temperature regulating device 4, the catalyst regeneration tower 3, the induced draft fan 2 and the auxiliary flue stop valve 1, and is finally discharged from the chimney 11. When the auxiliary flue 6 breaks down, the bypass flue stop valve 9 is opened, the auxiliary flue regulating valve 5 and the auxiliary flue stop valve 1 are closed, and the flue gas is discharged to the atmosphere from the chimney 11 through the bypass flue 7.

In order to realize stabilizing the air feed, the utility model provides a flue gas temperature adjusting device 4's fuel and combustion air mass flow are according to the change automatically regulated of former flue gas temperature and flow. The catalyst regeneration tower 3 absorbs the heat of the flue gas to generate steam with two pressures, and can be used for the production of steel enterprises.

Compared with the prior art, the utility model discloses can realize carrying out effective recycle to undulant electric stove flue gas waste heat by a wide margin, when reducing the thermal pollution to the surrounding environment, provide an effectual approach for further realizing that iron and steel enterprise energy saving and emission reduction reduces.

The utility model provides a catalyst regeneration tower 3 is active carbon regeneration system, utilizes the flue gas waste heat to regenerate the catalyst that is used for blast furnace gas desulfurization, has realized carrying out effectual utilization to the undulant electric stove flue gas waste heat by a wide margin, provides an effectual approach for further realizing that iron and steel enterprise energy saving and emission reduction reduces.

The utility model utilizes the waste heat of the blast furnace flue gas to regenerate the catalyst, thereby reducing the process cost of blast furnace gas desulfurization and achieving the purpose of resource recycling.

Examples

As shown in fig. 1, a flue gas waste heat utilization system comprises a flue gas temperature adjusting device 4, a catalyst regeneration tower 3, an induced draft fan 2, an original flue 8, an auxiliary flue 6, a bypass flue 7, an original flue stop valve 10, an auxiliary flue adjusting valve 5, an auxiliary flue stop valve 1, a bypass flue stop valve 9 and a chimney 11, wherein the auxiliary flue 6 and the bypass flue 7 are connected in parallel with the original flue 8, the auxiliary flue adjusting valve 5, the flue gas temperature adjusting device 4, the catalyst regeneration tower 3, the induced draft fan 2 and the auxiliary flue stop valve 1 are sequentially arranged on the auxiliary flue 6 along the flow direction of flue gas, and the bypass flue stop valve 9 is arranged on the bypass flue 7; the original flue 8 is a low-temperature flue; the bypass flue 7 is a high-temperature flue and is suitable for conveying flue gas with the temperature higher than 200 ℃; choose for use the utility model patent application number 201520576371.4's that the coke oven flue is automatic to open flashboard system soon as bypass flue stop valve 9, this automatic flashboard system that opens soon has the function of opening soon, including heat-resistant steel flashboard, pulley, steel cable, weight box, through weight box pulling steel cable, and then the flashboard on the pulling pulley, make its flashboard that cuts fast and open the flue under unusual operating mode condition. The smoke temperature adjusting device 4 comprises a thermocouple, a gas pipeline, a gas flow adjusting valve, a burner and an air mixing valve, wherein the thermocouple and a gas inlet valve are controlled in an interlocking mode to realize that the temperature of smoke is quickly increased to the temperature required by a catalyst.

In the working process of the embodiment, the original flue stop valve 10 and the bypass flue stop valve 9 are both in a normally closed state, and the auxiliary flue regulating valve 5 and the auxiliary flue stop valve 1 are both in a normally open state. Flue gas with the temperature of about 300-800 ℃ generated after electric furnace scrap steel is preheated enters an auxiliary flue 6 from a main flue 12, passes through an auxiliary flue regulating valve 5, a flue gas temperature regulating device 4, a catalyst regeneration tower 3, an induced draft fan 2 and an auxiliary flue stop valve 1 in sequence, and is finally discharged from a chimney 11. The temperature of the flue gas passing through the flue gas temperature adjusting device 4 is stabilized at 400 +/-10 ℃, and the temperature of the flue gas is reduced to about 165 ℃ after the flue gas passes through the catalyst regeneration tower 3 for absorbing heat and reducing the temperature. After absorbing the heat of the flue gas, the catalyst regeneration tower 3 produces fresh activated carbon catalyst and elemental sulfur for the production of steel enterprises.

When the flue gas after the electric furnace scrap steel is preheated is lower than 400 ℃, the combustion nozzle in the flue gas temperature adjusting device 4 is opened to ignite blast furnace gas or coke oven gas for afterburning, so that the temperature of the flue gas is increased to the optimal temperature required by the activated carbon catalyst; but when the flue gas after the electric furnace scrap steel is preheated is higher than 400 ℃, the temperature is reduced by opening the air mixing valve in the flue gas temperature regulating device 4. When the catalyst regeneration tower 3 breaks down, the bypass flue stop valve 9 is opened, the auxiliary flue regulating valve 5 and the auxiliary flue stop valve 1 are closed, and the flue gas is discharged to the atmosphere from the chimney 11 through the bypass flue 7.

Finally, the above embodiments are only used for illustrating the technical solutions of the present invention and not for limiting, and although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions may be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions, and all of them should be covered by the scope of the claims of the present invention.

Claims (7)

1. The utility model provides a flue gas waste heat utilization system, includes former flue and chimney that sets up in order along flue gas flow direction, be equipped with former flue stop valve on the former flue, its characterized in that: the device is characterized by further comprising an auxiliary flue connected with the original flue in parallel, wherein the auxiliary flue is used for regenerating a blast furnace gas desulfurization catalyst, and a smoke temperature adjusting device, a catalyst regeneration tower and a draught fan are sequentially arranged in the auxiliary flue along the flow direction of smoke.

2. The flue gas waste heat utilization system of claim 1, characterized in that: the original flue is a low-temperature flue.

3. The flue gas waste heat utilization system of claim 2, characterized in that: the auxiliary flue is connected with the bypass flue in parallel, the bypass flue is a high-temperature flue, and a bypass flue stop valve is arranged on the bypass flue.

4. The flue gas waste heat utilization system of claim 3, characterized in that: the bypass flue stop valve is a quick-opening valve.

5. The flue gas waste heat utilization system of claim 1, characterized in that: and an auxiliary flue regulating valve for regulating the flow of flue gas is also arranged on the auxiliary flue, and the auxiliary flue regulating valve is arranged on an air inlet pipeline of the flue gas temperature regulating device.

6. The flue gas waste heat utilization system of claim 1, characterized in that: and an auxiliary flue stop valve is also arranged on the auxiliary flue.

7. The flue gas waste heat utilization system of claim 1, characterized in that: the smoke temperature adjusting device comprises a mixed air adjusting valve and a combustion nozzle.

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