CN109595569B - Device for effectively removing acrylonitrile waste gas - Google Patents
Device for effectively removing acrylonitrile waste gas Download PDFInfo
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- CN109595569B CN109595569B CN201910041899.4A CN201910041899A CN109595569B CN 109595569 B CN109595569 B CN 109595569B CN 201910041899 A CN201910041899 A CN 201910041899A CN 109595569 B CN109595569 B CN 109595569B
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- NLHHRLWOUZZQLW-UHFFFAOYSA-N Acrylonitrile Chemical compound C=CC#N NLHHRLWOUZZQLW-UHFFFAOYSA-N 0.000 title claims abstract description 25
- 239000002912 waste gas Substances 0.000 title abstract description 72
- 238000010791 quenching Methods 0.000 claims abstract description 75
- 230000000171 quenching effect Effects 0.000 claims abstract description 67
- 238000007789 sealing Methods 0.000 claims abstract description 34
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 18
- 238000005406 washing Methods 0.000 claims abstract description 14
- 238000001179 sorption measurement Methods 0.000 claims abstract description 7
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 171
- 238000001816 cooling Methods 0.000 claims description 68
- 239000000919 ceramic Substances 0.000 claims description 50
- 239000007788 liquid Substances 0.000 claims description 46
- 230000001502 supplementing effect Effects 0.000 claims description 30
- 239000000945 filler Substances 0.000 claims description 11
- 230000003014 reinforcing effect Effects 0.000 claims description 9
- 229910001039 duplex stainless steel Inorganic materials 0.000 claims description 5
- 239000000463 material Substances 0.000 claims description 5
- 239000012774 insulation material Substances 0.000 claims description 4
- 230000000149 penetrating effect Effects 0.000 claims description 3
- 238000010926 purge Methods 0.000 claims description 3
- 239000007921 spray Substances 0.000 claims description 3
- 238000013461 design Methods 0.000 abstract description 9
- 238000000034 method Methods 0.000 abstract description 7
- 230000000694 effects Effects 0.000 abstract description 6
- 229910052799 carbon Inorganic materials 0.000 abstract 1
- 239000007789 gas Substances 0.000 description 30
- 238000012423 maintenance Methods 0.000 description 6
- 239000011148 porous material Substances 0.000 description 6
- 238000004519 manufacturing process Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 238000005338 heat storage Methods 0.000 description 4
- 239000000126 substance Substances 0.000 description 4
- 230000003647 oxidation Effects 0.000 description 3
- 238000007254 oxidation reaction Methods 0.000 description 3
- 230000007797 corrosion Effects 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 238000012544 monitoring process Methods 0.000 description 2
- 229920005989 resin Polymers 0.000 description 2
- 239000011347 resin Substances 0.000 description 2
- 238000003860 storage Methods 0.000 description 2
- 239000013589 supplement Substances 0.000 description 2
- XECAHXYUAAWDEL-UHFFFAOYSA-N acrylonitrile butadiene styrene Chemical compound C=CC=C.C=CC#N.C=CC1=CC=CC=C1 XECAHXYUAAWDEL-UHFFFAOYSA-N 0.000 description 1
- 229920000122 acrylonitrile butadiene styrene Polymers 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229920006026 co-polymeric resin Polymers 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 239000013256 coordination polymer Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 229910052736 halogen Inorganic materials 0.000 description 1
- 150000002367 halogens Chemical class 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 238000004321 preservation Methods 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 239000010802 sludge Substances 0.000 description 1
- 239000002002 slurry Substances 0.000 description 1
- 229920000638 styrene acrylonitrile Polymers 0.000 description 1
- 239000012855 volatile organic compound Substances 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
- F23G7/00—Incinerators or other apparatus for consuming industrial waste, e.g. chemicals
- F23G7/06—Incinerators or other apparatus for consuming industrial waste, e.g. chemicals of waste gases or noxious gases, e.g. exhaust gases
- F23G7/061—Incinerators or other apparatus for consuming industrial waste, e.g. chemicals of waste gases or noxious gases, e.g. exhaust gases with supplementary heating
- F23G7/065—Incinerators or other apparatus for consuming industrial waste, e.g. chemicals of waste gases or noxious gases, e.g. exhaust gases with supplementary heating using gaseous or liquid fuel
- F23G7/066—Incinerators or other apparatus for consuming industrial waste, e.g. chemicals of waste gases or noxious gases, e.g. exhaust gases with supplementary heating using gaseous or liquid fuel preheating the waste gas by the heat of the combustion, e.g. recuperation type incinerator
- F23G7/068—Incinerators or other apparatus for consuming industrial waste, e.g. chemicals of waste gases or noxious gases, e.g. exhaust gases with supplementary heating using gaseous or liquid fuel preheating the waste gas by the heat of the combustion, e.g. recuperation type incinerator using regenerative heat recovery means
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
- F23G5/00—Incineration of waste; Incinerator constructions; Details, accessories or control therefor
- F23G5/44—Details; Accessories
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
- F23G5/00—Incineration of waste; Incinerator constructions; Details, accessories or control therefor
- F23G5/50—Control or safety arrangements
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES
- F23J15/00—Arrangements of devices for treating smoke or fumes
- F23J15/02—Arrangements of devices for treating smoke or fumes of purifiers, e.g. for removing noxious material
- F23J15/04—Arrangements of devices for treating smoke or fumes of purifiers, e.g. for removing noxious material using washing fluids
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES
- F23J15/00—Arrangements of devices for treating smoke or fumes
- F23J15/06—Arrangements of devices for treating smoke or fumes of coolers
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28C—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA COME INTO DIRECT CONTACT WITHOUT CHEMICAL INTERACTION
- F28C1/00—Direct-contact trickle coolers, e.g. cooling towers
- F28C1/003—Direct-contact trickle coolers, e.g. cooling towers comprising outlet ducts for exhaust gases
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28C—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA COME INTO DIRECT CONTACT WITHOUT CHEMICAL INTERACTION
- F28C1/00—Direct-contact trickle coolers, e.g. cooling towers
- F28C1/02—Direct-contact trickle coolers, e.g. cooling towers with counter-current only
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28C—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA COME INTO DIRECT CONTACT WITHOUT CHEMICAL INTERACTION
- F28C3/00—Other direct-contact heat-exchange apparatus
- F28C3/06—Other direct-contact heat-exchange apparatus the heat-exchange media being a liquid and a gas or vapour
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F27/00—Control arrangements or safety devices specially adapted for heat-exchange or heat-transfer apparatus
- F28F27/003—Control arrangements or safety devices specially adapted for heat-exchange or heat-transfer apparatus specially adapted for cooling towers
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
- F23G2205/00—Waste feed arrangements
- F23G2205/18—Waste feed arrangements using airlock systems
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
- F23G2206/00—Waste heat recuperation
- F23G2206/10—Waste heat recuperation reintroducing the heat in the same process, e.g. for predrying
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Chimneys And Flues (AREA)
- Treating Waste Gases (AREA)
Abstract
The invention discloses a device for effectively removing acrylonitrile waste gas, which comprises an inlet fan, an inlet lifting valve, an RTO device, an outlet lifting valve, a quenching tower, a washing tower, a dehumidifying tower, an active carbon adsorption tower, an outlet fan and a chimney which are connected in sequence; the air outlet of the inlet fan is communicated with the air inlet at the bottom of the inlet lifting valve, the air outlet of the inlet lifting valve is communicated with the waste gas inlet of the lower furnace body of the RTO device, the waste gas outlet of the lower furnace body of the RTO device is communicated with the air inlet at the bottom of the outlet lifting valve, the air outlet of the outlet lifting valve is communicated with the air inlet pipe of the quenching tower, and the exhaust pipe of the quenching tower is communicated with the air inlet pipe of the washing tower. The design of the annular valve seat and the elastic sealing ring of the lifting valve of the device ensures that the device has the effect of multiple sealing and realizes zero leakage of waste gas in the use process. The device provides a set of device that system administered acrylonitrile waste gas, and the device is satisfied from the treatment of acrylonitrile to last emission all, and the practicality is high.
Description
Technical Field
The invention relates to the field of waste gas treatment, in particular to a device for effectively removing acrylonitrile waste gas.
Background
In the chemical industry, during the production process of styrene acrylonitrile butadiene copolymer resin (ABS), the tail gas contains a large amount of acrylonitrile, and according to Jiangsu province local standard, the volatile organic compounds in chemical industryEmission standards DB323151-2016 require acrylonitrile emission concentrations of less than 0.5mg/m 3 In the prior art, ningbo LG is a chemical industry Co., ltd, ABS, SAN, CP resin is produced, and the Korean heat accumulating type three-tower RTO knife valve structure is used for the resin, so that the acrylonitrile content in the waste gas is too high and does not reach the standard at present. The production of halogen slurry ABS and ion ABS resin is also carried out in a chemical plant in Changzhou, and the waste gas does not reach the standard at present due to the adoption of a two-tower RTO structure. Because of the relatively high content of the exhaust gas and tail gas, the concentration of the acrylonitrile to be discharged needs to be lower than 0.5mg/m 3 The removal efficiency of the environmental protection equipment RTO is not lower than 99.75%, which is a high requirement for heat accumulating type RTO. The removal efficiency of the two heat accumulating type RTO towers used at present is 95%, the removal efficiency of the heat accumulating type RTO+butterfly valve of the three towers is 96%, the removal efficiency of the heat accumulating type RTO+knife valve and the poppet valve of the three towers is 98%, and the removal efficiency of the poppet valve is 99%. It is also difficult to ensure removal efficiency of 99.75% or more.
Still further, the prior art acrylonitrile treatment device has no set of system device for cooling, washing, dehumidifying, adsorbing and finally discharging the acrylonitrile gas from the oxidation incineration to the exhaust gas, which is not intelligent and convenient.
Disclosure of Invention
The invention overcomes the defects in the prior art, and provides an acrylonitrile waste gas treatment device, wherein the multi-seal protection of a lifting valve thoroughly solves the problem of waste gas leakage of a thermal oxidation furnace, and the device adopts the combination of hard seal and soft seal, when the soft seal fails due to long-time working, the hard seal acts, the multi-seal is applied to both the hardness and the softness, the effect is better, and zero leakage is realized; in addition, the RTO device reduces the manufacturing cost through the split structure design of the upper furnace body and the lower furnace body, the early maintenance and the later maintenance are also simple, and the lifting valve is vertically arranged to avoid the output shaft from being blocked; the bottom of the RTO device is in direct contact with the ground, and the whole device is supported by the ground, so that more heat accumulator can be placed in the device; furthermore, the quenching tower device not only solves the problem of rapidly cooling the waste gas with the temperature of 850-1000 ℃ to 120-180 ℃ within 1-2 seconds, but also has the characteristic of corrosion resistance, and can effectively prolong the service life.
The technical scheme of the invention is realized as follows:
the device for effectively removing the acrylonitrile waste gas comprises an inlet fan, an inlet lifting valve, an RTO device, an outlet lifting valve, a quenching tower, a washing tower, a dehumidifying tower communicated with an air outlet pipe of the washing tower, an activated carbon adsorption tower communicated with the air outlet pipe of the dehumidifying tower, an outlet fan communicated with an air outlet of the activated carbon adsorption tower and a chimney communicated with an air outlet of the outlet fan, wherein the inlet fan, the inlet lifting valve, the RTO device, the outlet lifting valve, the quenching tower and the washing tower are sequentially connected; the inlet and outlet lifting valve comprises a bracket, a linear travel cylinder arranged at the top of the bracket and a hollow cylindrical supporting piece arranged in the lower part of the bracket, wherein the bracket is fixed with the linear travel cylinder through a cylinder mounting plate, and the lower part of the linear travel cylinder is connected with an output shaft penetrating through the center of the cylinder mounting plate and the lower end of the linear travel cylinder extends out of the bottom of the bracket; the supporting piece is formed by stacking a cylindrical upper supporting piece and a cylindrical lower supporting piece up and down, and an annular supporting plate is clamped between the upper supporting piece and the lower supporting piece; the upper supporting piece, the lower supporting piece and the supporting plate are fixed through flanges, and a pillar with the same height as the lower supporting piece is arranged at the center of the lower supporting piece; the lower end of the output shaft is connected with a control rod, and the lower end of the control rod is connected with a circular valve plate; the valve plate is pressed downwards to press the elastic sealing ring and simultaneously contacts with the upper end of the outer side wall of the annular valve seat; the RTO device comprises an upper furnace body and a lower furnace body, wherein the upper furnace body comprises an upper furnace body shell, reinforcing ribs are arranged outside the upper furnace body shell, heat accumulating ceramics with the thickness of 5cm to 15cm are arranged at the lower part of the upper furnace body, honeycomb heat accumulating bodies with the thickness of 30cm to 60cm are arranged below the heat accumulating ceramics, and heat insulating modules are attached to the inner wall of the upper furnace body shell; the lower furnace body comprises three lifting valves arranged at the upper part of the lower furnace body, a waste gas inlet arranged at the left end of the lower furnace body, a waste gas outlet arranged at the right end of the lower furnace body, and three purging air doors arranged at the lower part of the lower furnace body; the quenching tower comprises a quenching tower body, a water tank arranged outside the quenching tower body, a cooling pool arranged at the inner bottom of the quenching tower body and a nozzle cooling device arranged in the quenching tower body; the outer wall of the quenching tower body is stuck with an outer heat insulation material, and the quenching tower body is made of a duplex stainless steel 2205 material; the cooling tank is internally provided with cold water, the water tank is connected with the cooling tank through a water supplementing pipe, and the top of the water tank is provided with an external water pipe; the top of the quenching tower body is provided with an exhaust pipe, the middle lower part of the quenching tower body is provided with an air inlet pipe, the rear end of the air inlet pipe is fixed on the side wall of the quenching tower body, and the front end of the air inlet pipe is arranged below the water surface of a cooling pool at the lower part of the quenching tower body; the nozzle cooling device comprises a circulating pump, a water supply pipe and a plurality of branch pipes which are horizontally arranged above the water surface of the cold water tank at intervals, wherein the circulating pump is communicated with the cooling tank through the water supply pipe, the branch pipes are connected with the water supply pipe, and nozzles which spray downwards are uniformly distributed on each branch pipe; the air outlet of the inlet fan is communicated with an air inlet arranged at the bottom of the inlet lifting valve, the air outlet of the inlet lifting valve is communicated with an exhaust air inlet of the lower furnace body of the RTO device, the exhaust air outlet of the lower furnace body of the RTO device is communicated with the air inlet arranged at the bottom of the outlet lifting valve, the air outlet of the outlet lifting valve is communicated with an air inlet pipe of the quenching tower body, and an exhaust pipe of the quenching tower body is communicated with an air inlet pipe of the washing tower.
Specifically, the linear travel cylinder is connected with the PLC, when waste gas enters the poppet valve, the linear travel cylinder is controlled by the PLC, the output shaft and the valve plate act upwards, so that the waste gas enters the poppet valve from a gap in the supporting piece, and then enters the waste gas treatment equipment RTO. When the PLC controller gives a closing signal to the linear stroke cylinder, the linear stroke cylinder controls the output shaft and the valve plate to move downwards, when the valve plate falls, the elastic sealing ring is extruded firstly, namely the first sealing action of the poppet valve, then the valve plate continues to extrude downwards on the outer side wall of the annular valve seat, namely the second sealing action of the poppet valve, the valve plate continues to extrude downwards, and a part of the elastic sealing ring is extruded on the inner side wall of the annular valve seat, so that the third sealing action of the poppet valve is realized; and the three times of protection ensure that waste gas cannot enter the poppet valve, so that zero leakage is realized. The upper supporting piece and the lower supporting piece can be detached, the upper supporting piece and the lower supporting piece can be detached according to the requirements in practical application, the heights of the upper supporting piece and the lower supporting piece can be replaced according to the requirements, and the practicability is good. The waste gas enters the hearth through the air inlet of the lower furnace body, the low-temperature waste gas exchanges heat with the honeycomb heat accumulator and the heat accumulating ceramic, the honeycomb heat accumulator transfers heat to the low-temperature waste gas, the waste gas is oxidized and decomposed after absorbing the heat, the temperature of the waste gas reaches the ignition point to begin to burn, after the waste gas burns in the hearth for 1 to 2 seconds, the temperature of the waste gas reaches about 850 ℃, the waste gas passes through the honeycomb heat accumulator and the heat accumulating ceramic in the other tower, and the waste gas transfers heat to the low-temperature honeycomb heat accumulator and the heat accumulating ceramic at 850 ℃, so that the honeycomb heat accumulator and the heat accumulating ceramic are heated. The heated honeycomb heat accumulator and heat accumulating ceramic are used as the air inlet of the next circulation to heat the low-temperature exhaust gas, and the low-temperature exhaust gas is switched once in 3 minutes. And when the waste gas enters the lifting valve, the linear travel cylinder is controlled by the PLC to act upwards by the output shaft and the valve plate, so that the waste gas enters the lifting valve from a gap in the supporting piece and then enters the waste gas treatment equipment RTO. When the PLC controller gives a closing signal to the linear stroke cylinder, the linear stroke cylinder controls the output shaft and the valve plate to move downwards, when the valve plate falls, the elastic sealing ring is extruded firstly, namely the first sealing action of the poppet valve, then the valve plate continues to extrude downwards on the outer side wall of the annular valve seat, namely the second sealing action of the poppet valve, the valve plate continues to extrude downwards, and a part of the elastic sealing ring is extruded on the inner side wall of the annular valve seat, so that the third sealing action of the poppet valve is realized; and the three times of protection ensure that waste gas cannot enter the poppet valve, so that zero leakage is realized. The upper supporting piece and the lower supporting piece can be detached, the upper supporting piece and the lower supporting piece can be detached according to the requirements in practical application, the heights of the upper supporting piece and the lower supporting piece can be replaced according to the requirements, and the practicability is good. The sludge drying waste gas enters the quenching tower body through an air inlet pipe arranged at the middle lower part of the quenching tower body after high-temperature incineration and oxidation, performs primary heat exchange with cold water in a cooling tank at the inner bottom of the quenching tower body, and the waste gas is cooled for the first time by the cold water in the cooling tank, and is insoluble in water and a small part of uncooled waste gas and part of vaporized water in the cooling tank move to the upper part of the quenching tower body together. In addition, the circulating pump leads the water of the cooling pool at the bottom of the quenching tower body into the branch pipe above the water surface of the cooling pool through the water supply pipe, and the cold water in the branch pipe carries out secondary cooling on the waste gas.
Preferably, the cross section of the honeycomb heat accumulator is octagonal, the surface of the honeycomb heat accumulator is provided with a plurality of punched bulges, and the bulges on the surface of the honeycomb heat accumulator are arranged in a staggered way; the heat accumulating ceramic comprises a saddle-shaped ceramic bottom and a plurality of ceramic branches uniformly distributed on the saddle-shaped ceramic bottom, wherein each ceramic branch comprises a root connected with the saddle-shaped ceramic bottom and a free end far away from the saddle-shaped ceramic bottom, the ceramic branches are divided into 3 sections from the root to the free end, and each ceramic branch comprises a first branch piece connected with the saddle-shaped ceramic bottom, a second branch piece connected with the first branch piece at a certain included angle and a third branch piece connected with the second branch piece at a certain included angle.
Preferably, the included angle between the second support piece and the first support piece is 120-150 degrees, and the included angle between the third support piece and the second support piece is 130-150 degrees. The shape design can form a convolution near the fins, prolong the residence time of the air and improve the contact times of the air and the fins, thereby enabling the heat to be fully exchanged.
Preferably, a through hole for the output shaft to pass through is formed in the bottom plate of the support, a sealing joint with a T-shaped longitudinal section is fixedly sleeved on the output shaft, a concave filler seat is fixedly arranged on the bottom surface of the outer side of the bottom plate, graphite powder is filled in the filler seat, and the sealing joint is inserted into the filler seat. Specifically, graphite powder filled in the filler seat ensures that no gap exists between the output shaft and the through hole on the bracket bottom plate, thereby ensuring that no gas leaks.
Preferably, the valve plate is provided with clamping plates with diameters smaller than that of the valve plate and circular in shape, and the clamping plates and the valve plate are fixed at the lower end of the control rod through flanges. The setting of splint guarantees that the valve plate can not take place to warp at extruded in-process, increases the life-span of equipment.
Preferably, a reinforcing rib is arranged between the outer side of the annular valve seat and the supporting plate. The reinforcing ribs are used for protecting the annular valve seat so that the annular valve seat does not shift when being squeezed.
Preferably, 3 branch pipes are arranged above the water surface of the cold water tank from bottom to top, 10 first nozzles are uniformly arranged on the branch pipes below the cold water tank, 13 second nozzles are uniformly arranged on the branch pipes in the middle of the cold water tank, 16 third nozzles are uniformly arranged on the branch pipes above the cold water tank, 3 branch pipes are parallel to the horizontal plane, the pore size of meshes on the first nozzles is 0.05mm to 0.1mm, the pore size of meshes on the second nozzles is 0.1mm to 1mm, and the pore size of meshes on the third nozzles is 1mm to 1.5mm. Specifically, the water-insoluble and a small part of uncooled waste gas and the partially vaporized water in the cooling pool are contacted with atomized water sprayed by 3 branch pipe nozzles for multiple heat exchange, and the waste gas is cooled by the nozzle cooling device for multiple times; in the upward movement process of the waste gas, the waste gas is firstly contacted with atomized water sprayed by a third nozzle, the aperture of the third nozzle is large, the cooling effect on most waste gas can be achieved, then uncooled waste gas is contacted with a second nozzle, the aperture of the second nozzle is medium, a small quantity of waste gas can be cooled, finally a small quantity of uncooled waste gas is contacted with a first nozzle, the aperture of the first nozzle is small, and the residual waste gas can be sufficiently cooled; the cooled exhaust gas is rapidly condensed and falls to the bottom of the tower together with the atomized water. The cold water in the cooling tank and part of the water in the nozzle cooling device are brought into the washing tower at the rear end by the waste gas in the form of water vapor.
Preferably, the air inlet pipe is a pipe with a circular cross section, and the whole shape of the air inlet pipe is arc-shaped. Compared with a right-angle pipe, the arc-shaped pipe can change the direction of waste gas, so that the waste gas vertically enters the water surface, and the cooling is more sufficient.
Preferably, the cooling tank of the quenching tower body is provided with an in-tower high-liquid-level switch and an in-tower low-liquid-level switch respectively from top to bottom, the water supplementing pipe is provided with an in-tower water supplementing electromagnetic valve, and the in-tower high-liquid-level switch and the in-tower low-liquid-level switch are connected with the in-tower water supplementing electromagnetic valve. Specifically, when the low liquid level switch in the tower detects that the liquid level of water in the cooling tank is lower than the set low liquid level, the water supplementing valve in the tower is opened, and water in the water tank supplements water for the cooling tank in the quench tower body through the water supplementing pipe; when the high liquid level switch in the tower detects that the water in the cooling pool is added to the set high liquid level, the water supplementing valve in the tower is closed, and water supplementing to the cooling pool is stopped.
Preferably, the upper and lower water tanks outside the quenching tower body are respectively provided with a high liquid level switch in the water tank and a low liquid level switch in the water tank, the external water pipe at the top of the water tank is provided with a water tank water supplementing electromagnetic valve, and the high liquid level switch in the water tank and the low liquid level switch in the water tank are connected with the water tank water supplementing electromagnetic valve. Specifically, when the low liquid level switch in the water tank detects that the liquid level of water in the water tank is lower than the set low liquid level, the water supplementing valve of the water tank is opened, and the water tank is supplemented with water through the external water pipe at the top. When the high liquid level switch in the water tank detects that the water in the water tank is added to the set high liquid level, the water supplementing valve of the water tank is closed, and the water supplementing of the water tank is finished.
The design starting point, the idea and the beneficial effects of the invention adopting the technical scheme are as follows:
the design of the annular valve seat and the elastic sealing ring of the lifting valve of the device ensures that the device has the effect of multiple sealing and realizes zero leakage of waste gas in the use process. Moreover, the upper supporting piece and the lower supporting piece of the device can be detached, and the heights of the upper supporting piece and the lower supporting piece can be replaced according to the requirements, so that the device is good in practicability; in addition, the RTO device reduces the manufacturing cost of the device by the split structure design of the upper furnace body and the lower furnace body, the early maintenance and the later maintenance are also simplified, and the lifting valve of the device is vertically arranged to avoid the clamping of an output shaft, so that the device has stable performance during working; in addition, the bottom of the device is in direct contact with the ground, and the whole device is supported by the ground, so that more heat storage bodies can be placed in the device, and the heat storage efficiency can reach more than 96%. The working temperature of the quenching tower device can reach 850-1000 ℃, the quenching tower device is suitable for waste gas with higher initial temperature of 850-1000 ℃, the quenching tower body 1 is made of a duplex stainless steel 2205 material, the duplex stainless steel 2205 material is very corrosion-resistant, so the quenching tower device is also suitable for waste gas with corrosiveness, and because the distance between an air inlet pipe of the quenching tower device and a cooling tank is relatively close, the waste gas can be quickly contacted with cold water in the cooling tank to be cooled for the first time after entering the quenching tower device, in addition, the nozzle cooling device arranged on the quenching tower device can cool the waste gas for multiple times, high and low liquid level switches are arranged on the cooling tank and a water tank, the water level in the cooling tank and the water tank can be automatically controlled, personnel continuity monitoring is not needed, and the efficiency is relatively high.
The invention provides a device for treating acrylonitrile waste gas by a system, which is high in practicality from the treatment of acrylonitrile to the final discharge.
Drawings
FIG. 1 is a schematic diagram of the connection of the various parts of the invention;
FIG. 2 is a schematic diagram of an inventive poppet valve;
FIG. 3 is a schematic view of the portion of FIG. 2 a;
FIG. 4 is a schematic front view of an RTO apparatus of the present invention;
FIG. 5 is a schematic cross-sectional view of an RTO apparatus of the present invention;
FIG. 6 is a top view of an RTO apparatus of the present invention;
FIG. 7 is a schematic view of the surface protrusion of the inventive honeycomb thermal mass;
FIG. 8 is a schematic diagram of a thermal storage ceramic of the invention;
FIG. 9 is a schematic diagram of an inventive quench tower.
The reference numerals are as follows: 1. a bracket; 101. a bottom plate; 102. a limit switch; 103. a floating joint; 2. a linear travel cylinder; 3. a mounting plate; 4. a support; 401. an upper support; 402. a lower support; 403. a support plate; 404. a valve seat; 405. an inner sidewall; 406. an outer sidewall; 407. a seal ring; 408. reinforcing ribs; 5. an output shaft; 501. a control lever; 502. a valve plate; 503. a joint; 504. a filler seat; 505. a clamping plate; 6. a support post; 7. a backing plate; 8. an upper furnace body shell; 801. reinforcing ribs; 802. a heat accumulating ceramic; 803. a honeycomb heat accumulator; 804. a thermal insulation module; 8021. root part; 8022. a first support sheet; 8023. a second support sheet; 8024. a third support; 8025. saddle-shaped ceramic bottom; 8026. ceramic branching; 8031. a protrusion; 9. a poppet valve; 9a, inlet poppet valve; 9b, outlet poppet valve; 10. an air inlet; 11. an air outlet; 1c, a quench tower body; 101c, an exhaust pipe; 102c, an air inlet pipe; 2c, an external heat insulation material; 3c, a cold water tank; 301c, a high liquid level switch in the tower; 302c, a low liquid level switch in the tower; 4c, a nozzle cooling device; 401c, a circulation pump; 402c, a water supply pipe; 5c, branch pipes; 501c, a first nozzle; 502c, a second nozzle; 503c, a third nozzle; 6c, a water tank; 601c, a water supplementing pipe; 602c, a water supplementing electromagnetic valve in the tower; 603c, a high liquid level switch in the water tank; 604c, a low level switch in the water tank; 605c, external water pipe; 606c, a water tank water supplementing valve.
Detailed Description
The specific embodiments of the present invention are as follows:
as shown in figure 1, the device for effectively removing the acrylonitrile waste gas comprises an inlet fan, an inlet lifting valve 9a, an RTO device, an outlet lifting valve 9b, a quenching tower, a washing tower, a dehumidifying tower communicated with an air outlet pipe of the washing tower, an activated carbon adsorption tower communicated with the air outlet pipe of the dehumidifying tower, an outlet fan communicated with an air outlet of the activated carbon adsorption tower and a chimney communicated with an air outlet of the outlet fan, which are sequentially connected; as shown in fig. 2, the inlet and outlet poppet valves 9a and 9b comprise a bracket 1, a linear travel cylinder 2 arranged at the top of the bracket 1, and a hollow cylindrical support 4 arranged in the lower part of the bracket 1, wherein the bracket 1 and the linear travel cylinder 2 are fixed through a cylinder mounting plate 3, and an output shaft 5 penetrating through the center of the cylinder mounting plate 3 and extending out of the bottom of the bracket 1 from the lower end of the linear travel cylinder 2 is connected to the lower part of the linear travel cylinder 2; the supporting piece 4 is formed by stacking a cylindrical upper supporting piece 401 and a cylindrical lower supporting piece 402 up and down, and an annular supporting plate 403 is clamped between the upper supporting piece 401 and the lower supporting piece 402; the upper support piece 401, the lower support piece 402 and the support plate 403 are fixed by flanges, and a pillar 6 with the same height as the lower support piece 402 is arranged at the center of the lower support piece 402; the lower end of the output shaft 5 is connected with a control rod 501, and the lower end of the control rod 501 is connected with a circular valve plate 502; as shown in fig. 3, an annular valve seat 404 is provided on the support plate 403, the annular valve seat 404 has an inner side wall 405 and an outer side wall 406 perpendicular to the support plate 403, the outer side wall 406 is higher than the inner side wall 405, an annular elastic sealing ring 407 is provided between the inner side wall and the outer side wall 406, the upper end of the elastic sealing ring 407 is higher than the outer side wall 406, the elastic sealing ring 407 is pressed and simultaneously contacts with the upper end of the outer side wall 406 of the annular valve seat 404 when the valve plate 502 is pressed down, and the height of the elastic sealing ring 407 is 5cm; as shown in fig. 4 to 6, the RTO device comprises an upper furnace body and a lower furnace body, the upper furnace body comprises an upper furnace body shell 8, reinforcing ribs 801 arranged outside the upper furnace body shell 8, heat accumulating ceramics 802 which are uniformly distributed at the lower part of the upper furnace body and have the thickness of 5cm to 15cm, a honeycomb heat accumulator 803 with the thickness of 30cm to 60cm is arranged below the heat accumulating ceramics 802, and a heat preservation module 804 is attached to the inner wall of the upper furnace body shell 8; the lower furnace body comprises three lifting valves 9 arranged at the upper part of the lower furnace body, an exhaust gas inlet 10 arranged at the left end of the lower furnace body, an exhaust gas outlet 11 arranged at the right end of the lower furnace body, and three purging air doors 12 arranged at the lower part of the lower furnace body; as shown in fig. 9, the quenching tower comprises a quenching tower body 1c, a water tank 6c arranged outside the quenching tower body 1c, a cooling tank 3c arranged at the inner bottom of the quenching tower body 1c and a nozzle cooling device 4c arranged in the quenching tower body 1 c; the outer wall of the quench tower body 1c is stuck with an outer heat insulation material 2c, and the quench tower body 1c is made of a duplex stainless steel 2205 material; cold water is arranged in the cooling tank 3c, the water tank 6c is connected with the cooling tank 3c through a water supplementing pipe 601c, and an external water pipe 605c is arranged at the top of the water tank 6 c; the top of the quenching tower body 1c is provided with an exhaust pipe 101c, the middle lower part of the quenching tower body 1c is provided with an air inlet pipe 102c, the rear end of the air inlet pipe 102c is fixed on the side wall of the quenching tower body 1c, and the front end of the air inlet pipe 102c is arranged below the water surface of a cooling pool 3c at the lower part of the quenching tower body 1 c; the nozzle cooling device 4c comprises a circulating pump 401c, a water supply pipe 402c and a plurality of branch pipes 5c which are horizontally arranged above the water surface of the cold water tank 3c at intervals, wherein the circulating pump 401c is communicated with the cooling tank 3c through the water supply pipe 402c, meanwhile, the branch pipes 5c are connected with the water supply pipe 402c, and nozzles which spray downwards are uniformly distributed on each branch pipe 5c; the air outlet of the inlet fan is communicated with an air inlet arranged at the bottom of an inlet lifting valve 9a, the air outlet of the inlet lifting valve 9a is communicated with an exhaust air inlet 10 of a lower furnace body of the RTO device, the exhaust air outlet 11 of the lower furnace body of the RTO device is communicated with an air inlet arranged at the bottom of an outlet lifting valve 9b, the air outlet of the outlet lifting valve 9b is communicated with an air inlet pipe 102c of a quenching tower body 1c, and an air outlet pipe 101c of the quenching tower body 1c is communicated with an air inlet pipe of a washing tower.
Specifically, when exhaust gas enters the poppet valve, the linear stroke cylinder 2 is connected to a PLC controller (not shown), and the output shaft 5 and the valve plate 502 are moved upward under the control of the PLC controller (not shown), so that exhaust gas enters the poppet valve from a gap in the support 4, and then enters the exhaust gas treatment device RTO (not shown). When a PLC (not shown) gives a closing signal to the linear stroke cylinder 2, the linear stroke cylinder 2 controls the output shaft 5 and the valve plate 502 to move downwards, when the valve plate 502 falls down, the elastic sealing ring 407 is extruded firstly, namely, the first sealing action of the poppet valve is carried out, then the valve plate 502 continues to be extruded downwards on the outer side wall 406 of the annular valve seat 404, namely, the second sealing action of the poppet valve is carried out, the valve plate 502 continues to be extruded downwards, and a part of the elastic sealing ring 407 is extruded on the inner side wall 405 of the annular valve seat 404, so that the third sealing action of the poppet valve is realized; and the three times of protection ensure that waste gas cannot enter the poppet valve, so that zero leakage is realized. The upper support member 401 and the lower support member 402 can be detached, so that the disassembly is convenient in practical application, and the heights of the upper support member 401 and the lower support member 402 can be changed according to requirements, so that the practicability is better.
Further, a through hole for the output shaft 5 to pass through is arranged on the bottom plate 101 of the bracket 1, a sealing joint 503 with a T-shaped longitudinal section is fixedly sleeved on the output shaft 5, a concave filler seat 504 is fixedly arranged on the bottom surface of the outer side of the bottom plate 101, graphite powder is filled in the filler seat 504, and the sealing joint 503 is inserted into the filler seat 504. Specifically, the graphite powder filled in the filling seat 504 makes no gap between the output shaft 5 and the through hole on the bottom plate 101 of the bracket 1, thereby ensuring that no gas leaks.
The valve plate 502 is provided with a clamping plate 505 with a diameter smaller than that of the valve plate 502 and a circular shape, and the clamping plate 505 and the valve plate 502 are fixed at the lower end of the control rod 501 through flanges. The clamping plate 505 ensures that the valve plate 502 cannot deform in the extrusion process, and the service life of the device is prolonged.
A reinforcing rib 408 is arranged between the outer side of the annular valve seat 404 and the supporting plate 403. The ribs 408 serve to protect the annular valve seat 404 so that the annular valve seat 404 does not shift when squeezed. In addition, the annular valve seat 404 is internally filled with three layers of backing plates 7, the backing plates 7 can be added or detached according to the practical situation during use, the height is flexibly controlled, and the use is convenient
As shown in fig. 7 and 8, the cross section of the honeycomb heat accumulator 803 is octagonal, a plurality of punched protrusions 8031 are provided on the surface of the honeycomb heat accumulator 803, and the protrusions 8031 on the surface of the honeycomb heat accumulator 803 are staggered; the heat accumulating ceramic 802 comprises a saddle-shaped ceramic bottom 8025 and a plurality of ceramic branches 8026 uniformly distributed on the saddle-shaped ceramic bottom 8025, wherein each ceramic branch 8026 comprises a root portion 8021 connected with the saddle-shaped ceramic bottom 8025 and a free end far away from the saddle-shaped ceramic bottom 8025, the ceramic branches 8026 are divided into 3 sections from the root portion 8021 to the free end, and the sections are respectively a first branch piece 8022 connected with the saddle-shaped ceramic bottom 8025, a second branch piece 8023 connected with the first branch piece 8022 in a certain included angle, and a third branch piece 8024 connected with the second branch piece 8022 in a certain included angle.
Specifically, the exhaust gas enters the hearth through the air inlet 10 of the lower furnace body of the RTO device, the low-temperature exhaust gas exchanges heat with the honeycomb heat accumulator 803 and the heat accumulating ceramic 802, the honeycomb heat accumulator 803 transfers heat to the low-temperature exhaust gas, the exhaust gas is oxidized and decomposed after absorbing heat, the combustion starts when reaching the ignition point temperature, after the exhaust gas burns for 1 to 2 seconds in the hearth, the exhaust gas reaches about 850 ℃, and then the exhaust gas passes through the honeycomb heat accumulator 803 and the heat accumulating ceramic 802 in the other tower, and the exhaust gas transfers heat to the honeycomb heat accumulator 803 and the heat accumulating ceramic 802 at the low temperature, so that the honeycomb heat accumulator 803 and the heat accumulating ceramic 802 are heated. The heated honeycomb thermal accumulator 803 and thermal storage ceramic 802 serve as air inlets for the next cycle to heat the incoming low temperature exhaust gas, typically once every 3 minutes
The included angle between the second support 8023 and the first support 8022 is 120-150 degrees, and the included angle between the third support 8024 and the second support 8022 is 130-150 degrees. The shape design can form a convolution near the heat accumulating ceramic 802, prolong the residence time of the exhaust gas and increase the contact times of the exhaust gas and the heat accumulating ceramic 802, thereby enabling the heat to be fully exchanged.
As shown in fig. 9, 3 branch pipes 5c are arranged above the water surface of the cold water tank 3c of the quenching tower from bottom to top, 10 first nozzles 501c are uniformly arranged on the branch pipes below, 13 second nozzles 502c are uniformly arranged on the branch pipes in the middle, 16 third nozzles 503c are uniformly arranged on the branch pipes above, 3 branch pipes 5 are parallel to the horizontal plane, the pore size of the mesh holes on the first nozzles 501c is 0.05mm to 0.1mm, the pore size of the mesh holes on the second nozzles 502c is 0.1mm to 1mm, and the pore size of the mesh holes on the third nozzles 503c is 1mm to 1.5mm.
Specifically, the water-insoluble and a small part of uncooled exhaust gas and the partially vaporized water in the cooling tank 3c are contacted with atomized water sprayed from the nozzles of the 3 branch pipes 5c to perform heat exchange for a plurality of times, and the exhaust gas is cooled for a plurality of times by the nozzle cooling device 4c; in the upward movement process of the waste gas, the waste gas is firstly contacted with atomized water sprayed by a third nozzle, the aperture of the third nozzle is large, the cooling effect on most waste gas can be achieved, then uncooled waste gas is contacted with a second nozzle, the aperture of the second nozzle is medium, a small quantity of waste gas can be cooled, finally a small quantity of uncooled waste gas is contacted with a first nozzle, the aperture of the first nozzle is small, and the residual waste gas can be sufficiently cooled; the cooled exhaust gas is rapidly condensed and falls to the bottom of the tower together with the atomized water. The cold water in the cooling tank 3c and part of the water in the nozzle cooling device 4c are brought into a rear scrubber (not shown) by the exhaust gas in the form of steam.
The air inlet pipe 102c is a pipe with a circular cross section, and the overall shape of the air inlet pipe 102c is arc-shaped. Compared with a right-angle pipe, the arc-shaped pipe can change the direction of waste gas, so that the waste gas vertically enters the water surface, and the cooling is more sufficient.
An in-tower high liquid level switch 301c and an in-tower low liquid level switch 302c are respectively arranged in the cooling tank 3c of the quench tower body 1c up and down, an in-tower water supplementing solenoid valve 602c is arranged on the water supplementing pipe 601c, and the in-tower high liquid level switch 301c and the in-tower low liquid level switch 302c are connected with the in-tower water supplementing solenoid valve 602 c.
Specifically, the high liquid level switch 301c in the tower and the low liquid level switch 302c in the tower are floating ball liquid level switches; when the low liquid level switch 302c in the tower detects that the liquid level of the water in the cooling tank 3c is lower than the set low liquid level, the water supplementing valve 602c in the tower is opened, and the water in the water tank 6c supplements the water for the cooling tank 3c in the quench tower body 1c through the water supplementing pipe 601 c; when the in-tower high level switch 301c detects that the water in the cooling tank 3c is added to the set high level, the in-tower water replenishment valve 602c is closed, and the replenishment of water to the cooling tank 3c is stopped.
The upper and lower parts of the water tank 6c outside the quench tower body 1c are respectively provided with a high liquid level switch 603c in the water tank and a low liquid level switch 604c in the water tank, an external water pipe 605c at the top of the water tank 6c is provided with a water supplementing electromagnetic valve 606c in the water tank, and the high liquid level switch 603c in the water tank and the low liquid level switch 604c in the water tank are connected with the water supplementing electromagnetic valve 602c in the water tank.
Specifically, the high level switch 603c in the water tank and the low level switch 604c in the water tank are floating ball level switches; when the low level switch 604c in the water tank detects that the level of water in the water tank 6c is lower than the set low level, the water tank water replenishing valve 602c is opened, and the water tank 6c is replenished through the external water pipe 605c at the top. When the in-tank high level switch 603c detects that the water in the tank 6c is added to the set high level, the tank water replenishment valve 602c is closed and the tank 6c is replenished with water.
The design of the annular valve seat 404 and the elastic sealing ring 407 of the device poppet valve of the invention ensures that the device has the effect of multiple seals, and realizes zero leakage of waste gas in the use process. The upper support piece 401 and the lower support piece 402 of the device can be detached, and the heights of the upper support piece 401 and the lower support piece 402 can be replaced according to requirements, so that the device is good in practicability; in addition, the RTO device reduces the manufacturing cost of the device by the split structure design of the upper furnace body and the lower furnace body, the early maintenance and the later maintenance are also simplified, and the lifting valve 9 of the device is vertically arranged to avoid the clamping of the output shaft 5, so that the device has stable performance during working; in addition, the bottom of the device is in direct contact with the ground, and the whole device is supported by the ground, so that more heat storage bodies can be placed in the device, and the heat storage efficiency can reach more than 96%. The distance between the air inlet pipe 102c of the quenching tower device and the cooling tank 3c is relatively short, so that the waste gas can be quickly contacted with cold water in the cooling tank 3c to be cooled for the first time after entering the quenching tower device, and in addition, the nozzle cooling device 4c arranged on the quenching tower device can cool the waste gas for a plurality of times; the waste gas can be suddenly reduced after being cooled for many times in the quenching tower device, the quenching tower device is provided with a high-liquid level switch and a low-liquid level switch on the cooling tank 3c and the water tank 6c, the water level in the cooling tank 3c and the water tank 6c can be automatically controlled, personnel continuity monitoring is not needed, and the efficiency is high.
The device provides a set of device that system administered acrylonitrile waste gas, and the device is satisfied from the treatment of acrylonitrile to last emission all, and the practicality is high.
Claims (6)
1. An apparatus for effectively removing acrylonitrile off-gas, characterized in that: the device comprises an inlet fan, an inlet lifting valve (9 a), an RTO device, an outlet lifting valve (9 b), a quenching tower, a washing tower, a dehumidifying tower communicated with an air outlet pipe of the washing tower, an activated carbon adsorption tower communicated with the air outlet pipe of the dehumidifying tower, an outlet fan communicated with an air outlet of the activated carbon adsorption tower and a chimney communicated with an air outlet of the outlet fan, which are sequentially connected; the inlet lifting valve (9 a) and the outlet lifting valve (9 b) comprise a bracket (1), a linear stroke cylinder (2) arranged at the top of the bracket (1), a hollow cylindrical support piece (4) arranged in the lower part of the bracket (1), the bracket (1) and the linear stroke cylinder (2) are fixed through a cylinder mounting plate (3), and an output shaft (5) penetrating through the center of the cylinder mounting plate (3) and extending out of the bottom of the bracket (1) from the lower part of the linear stroke cylinder (2); the support piece (4) is formed by stacking a cylindrical upper support piece (401) and a cylindrical lower support piece (402) up and down, and an annular support plate (403) is clamped between the upper support piece (401) and the lower support piece (402); the lower end of the output shaft (5) is connected with a control rod (501), and the lower end of the control rod (501) is connected with a circular valve plate (502); an annular valve seat (404) is arranged on the supporting plate (403), the annular valve seat (404) is provided with an inner side wall (405) and an outer side wall (406) which are perpendicular to the supporting plate (403), the outer side wall (406) is higher than the inner side wall (405), an annular elastic sealing ring (407) is arranged between the inner side wall and the outer side wall (406), the upper end of the elastic sealing ring (407) is higher than the outer side wall (406), and when the valve plate (502) is pressed down, the elastic sealing ring (407) is extruded and simultaneously contacts with the upper end of the outer side wall (406) of the annular valve seat (404); the RTO device comprises an upper furnace body and a lower furnace body, wherein the upper furnace body comprises an upper furnace body shell (8), reinforcing ribs (801) arranged outside the upper furnace body shell (8), heat accumulating ceramics (802) with the thickness of 5cm to 15cm are arranged at the lower part of the upper furnace body, honeycomb heat accumulating bodies (803) with the thickness of 30cm to 60cm are arranged below the heat accumulating ceramics (802), and heat insulating modules (804) are attached to the inner wall of the upper furnace body shell (8); the lower furnace body comprises three inlet lifting valves (9) arranged at the upper part of the lower furnace body, an exhaust gas inlet (10) arranged at the left end of the lower furnace body, an exhaust gas outlet (11) arranged at the right end of the lower furnace body, and three purging air doors (12) arranged at the lower part of the lower furnace body; the quenching tower comprises a quenching tower body (1 c), a water tank (6 c) arranged outside the quenching tower body (1 c), a cooling pool (3 c) arranged at the inner bottom of the quenching tower body (1 c) and a nozzle cooling device (4 c) arranged in the quenching tower body (1 c); the outer wall of the quenching tower body (1 c) is stuck with an outer heat insulation material (2 c), and the quenching tower body (1 c) is made of a duplex stainless steel 2205 material; cold water is arranged in the cooling tank (3 c), the water tank (6 c) is connected with the cooling tank (3 c) through a water supplementing pipe (601 c), and an external water pipe (605 c) is arranged at the top of the water tank (6 c); an exhaust pipe (101 c) is arranged at the top of the quenching tower body (1 c), an air inlet pipe (102 c) is arranged at the middle lower part of the quenching tower body (1 c), the rear end of the air inlet pipe (102 c) is fixed on the side wall of the quenching tower body (1 c), and the front end of the air inlet pipe (102 c) is arranged below the water surface of a cooling pool (3 c) at the lower part of the quenching tower body (1 c); the nozzle cooling device (4 c) comprises a circulating pump (401 c), a water supply pipe (402 c) and a plurality of branch pipes (5 c) which are horizontally arranged above the water surface of the cooling tank (3 c) at intervals, wherein the circulating pump (401 c) is communicated with the cooling tank (3 c) through the water supply pipe (402 c), meanwhile, the branch pipes (5 c) are connected with the water supply pipe (402 c), and nozzles which spray downwards are uniformly distributed on each branch pipe (5 c); an air outlet of the inlet fan is communicated with an air inlet arranged at the bottom of an inlet lifting valve (9 a), an air outlet of the inlet lifting valve (9 a) is communicated with an exhaust air inlet (10) of a lower furnace body of the RTO device, an exhaust air outlet (11) of the lower furnace body of the RTO device is communicated with an air inlet arranged at the bottom of an outlet lifting valve (9 b), an air outlet of the outlet lifting valve (9 b) is communicated with an air inlet pipe (102 c) of a quenching tower body (1 c), and an exhaust pipe (101 c) of the quenching tower body (1 c) is communicated with an air inlet pipe of a washing tower;
the cross section of the honeycomb heat accumulator (803) is octagonal, a plurality of punched protrusions (8031) are arranged on the surface of the honeycomb heat accumulator (803), and the protrusions (8031) on the surface of the honeycomb heat accumulator (803) are arranged in a staggered mode; the heat accumulating ceramic (802) comprises a saddle-shaped ceramic bottom (8025) and a plurality of ceramic branches (8026) uniformly distributed on the saddle-shaped ceramic bottom (8025), wherein each ceramic branch (8026) comprises a root (8021) connected with the saddle-shaped ceramic bottom (8025) and a free end far away from the saddle-shaped ceramic bottom (8025), the ceramic branches (8026) are divided into 3 sections from the root (8021) to the free end, and the sections are respectively a first support piece (8022) connected with the saddle-shaped ceramic bottom (8025), a second support piece (8023) connected with the first support piece (8022) at a certain included angle and a third support piece (8024) connected with the second support piece (8022) at a certain included angle;
the included angle between the second support (8023) and the first support (8022) is 120-150 degrees, and the included angle between the third support (8024) and the second support (8022) is 130-150 degrees;
a through hole for the output shaft (5) to pass through is formed in the bottom plate (101) of the bracket (1), a sealing joint (503) with a T-shaped longitudinal section is fixedly sleeved on the output shaft (5), a concave filler seat (504) is fixedly arranged on the bottom surface of the outer side of the bottom plate (101), graphite powder is filled in the filler seat (504), and the sealing joint (503) is inserted into the filler seat (504);
the valve plate (502) is provided with clamping plates (505) with the diameter smaller than that of the valve plate (502) and the shape of the clamping plates is round, and the clamping plates (505) and the valve plate (502) are fixed at the lower end of the control rod (501) through flanges.
2. An apparatus for effectively removing acrylonitrile off-gas as defined in claim 1, wherein: reinforcing ribs (408) are arranged between the outer side of the annular valve seat (404) and the supporting plate (403).
3. An apparatus for effectively removing acrylonitrile off-gas as defined in claim 1, wherein: the cooling pool (3 c) is characterized in that 3 branch pipes (5 c) are arranged above the water surface from bottom to top, 10 first nozzles (501 c) are uniformly arranged on the branch pipe below the cooling pool, 13 second nozzles (502 c) are uniformly arranged on the branch pipe in the middle of the cooling pool, 16 third nozzles (503 c) are uniformly arranged on the branch pipe above the cooling pool, and the 3 branch pipes (5 c) are all parallel to the horizontal plane; the mesh size on the first nozzle (501 c) is 0.05mm to 0.1mm, the mesh size on the second nozzle (502 c) is 0.1mm to 1mm, and the mesh size on the third nozzle (503 c) is 1mm to 1.5mm.
4. An apparatus for effectively removing acrylonitrile off-gas as defined in claim 1, wherein: the air inlet pipe (102 c) is a pipe with a circular cross section, and the whole shape of the air inlet pipe (102 c) is arc-shaped.
5. An apparatus for effectively removing acrylonitrile off-gas as defined in claim 1, wherein: an in-tower high liquid level switch (301 c) and an in-tower low liquid level switch (302 c) are respectively arranged in a cooling tank (3 c) of the quenching tower body (1 c), an in-tower water supplementing electromagnetic valve (602 c) is arranged on the water supplementing pipe (601 c), and the in-tower high liquid level switch (301 c) and the in-tower low liquid level switch (302 c) are connected with the in-tower water supplementing electromagnetic valve (602 c).
6. An apparatus for effectively removing acrylonitrile off-gas as defined in claim 1, wherein: the water tank (6 c) outside the quenching tower body (1 c) is provided with a high liquid level switch (603 c) in the water tank and a low liquid level switch (604 c) in the water tank respectively from top to bottom, an external water pipe (605 c) at the top of the water tank (6 c) is provided with a water tank water supplementing electromagnetic valve (606 c), and the high liquid level switch (603 c) in the water tank and the low liquid level switch (604 c) in the water tank are connected with the water tank water supplementing electromagnetic valve (606 c).
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