CN110732220A - Paint spraying line waste gas adsorption concentration catalytic combustion treatment system and treatment method thereof - Google Patents
Paint spraying line waste gas adsorption concentration catalytic combustion treatment system and treatment method thereof Download PDFInfo
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- CN110732220A CN110732220A CN201911148467.XA CN201911148467A CN110732220A CN 110732220 A CN110732220 A CN 110732220A CN 201911148467 A CN201911148467 A CN 201911148467A CN 110732220 A CN110732220 A CN 110732220A
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- 238000007084 catalytic combustion reaction Methods 0.000 title claims abstract description 73
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 34
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 claims description 28
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- UHOVQNZJYSORNB-UHFFFAOYSA-N Benzene Chemical compound C1=CC=CC=C1 UHOVQNZJYSORNB-UHFFFAOYSA-N 0.000 abstract description 24
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- 229910017604 nitric acid Inorganic materials 0.000 abstract description 8
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- 238000002485 combustion reaction Methods 0.000 abstract description 7
- 239000012141 concentrate Substances 0.000 abstract description 5
- 238000010438 heat treatment Methods 0.000 description 15
- 229910052799 carbon Inorganic materials 0.000 description 10
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- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 description 2
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- 229920000742 Cotton Polymers 0.000 description 2
- RTZKZFJDLAIYFH-UHFFFAOYSA-N Diethyl ether Chemical compound CCOCC RTZKZFJDLAIYFH-UHFFFAOYSA-N 0.000 description 2
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- XEKOWRVHYACXOJ-UHFFFAOYSA-N Ethyl acetate Chemical compound CCOC(C)=O XEKOWRVHYACXOJ-UHFFFAOYSA-N 0.000 description 1
- LSDPWZHWYPCBBB-UHFFFAOYSA-N Methanethiol Chemical compound SC LSDPWZHWYPCBBB-UHFFFAOYSA-N 0.000 description 1
- YGYAWVDWMABLBF-UHFFFAOYSA-N Phosgene Chemical compound ClC(Cl)=O YGYAWVDWMABLBF-UHFFFAOYSA-N 0.000 description 1
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- 229910021529 ammonia Inorganic materials 0.000 description 1
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- 239000000919 ceramic Substances 0.000 description 1
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- 238000004140 cleaning Methods 0.000 description 1
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- 238000007592 spray painting technique Methods 0.000 description 1
- FWMUJAIKEJWSSY-UHFFFAOYSA-N sulfur dichloride Chemical compound ClSCl FWMUJAIKEJWSSY-UHFFFAOYSA-N 0.000 description 1
- 238000009423 ventilation Methods 0.000 description 1
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/02—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by adsorption, e.g. preparative gas chromatography
- B01D53/04—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by adsorption, e.g. preparative gas chromatography with stationary adsorbents
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D50/00—Combinations of methods or devices for separating particles from gases or vapours
- B01D50/60—Combinations of devices covered by groups B01D46/00 and B01D47/00
-
- 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
- F23G7/07—Incinerators or other apparatus for consuming industrial waste, e.g. chemicals of waste gases or noxious gases, e.g. exhaust gases in which combustion takes place in the presence of catalytic material
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2253/00—Adsorbents used in seperation treatment of gases and vapours
- B01D2253/10—Inorganic adsorbents
- B01D2253/102—Carbon
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2259/00—Type of treatment
- B01D2259/40—Further details for adsorption processes and devices
- B01D2259/40083—Regeneration of adsorbents in processes other than pressure or temperature swing adsorption
- B01D2259/40088—Regeneration of adsorbents in processes other than pressure or temperature swing adsorption by heating
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Environmental & Geological Engineering (AREA)
- Analytical Chemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Treating Waste Gases (AREA)
Abstract
The invention discloses an paint spraying line waste gas adsorption concentration catalytic combustion treatment system and a treatment method thereof, wherein the system comprises a curing oven, a paint spraying room, a plurality of waste gas treatment modules, a catalytic combustion module and a discharge module, the treatment method comprises S1 waste gas treatment and S2 acid mist treatment, the invention provides catalytic combustion treatment systems for paint spraying waste gas, the system performs purification treatment on main pollutants VOCs, benzene, toluene, xylene, sulfuric acid mist, nitric acid mist and the like in the paint spraying waste gas, the adsorption concentration process is adopted to concentrate the low-concentration high-air-volume waste gas into the high-concentration low-air-volume waste gas, and then the waste gas is treated in a combustion mode.
Description
Technical Field
The invention relates to the field of waste gas treatment equipment systems, in particular to paint spraying line waste gas adsorption concentration catalytic combustion treatment systems and treatment methods.
Background
During the painting of the equipment in the painting booth, a lot of organic waste gases are generated, such as: VOCs, benzene, toluene, xylene, sulfuric acid mist, nitric acid mist, and the like.
The waste gas is required to be treated, if the waste gas is not treated, the waste gas is directly put into the atmosphere, so that atmospheric pollution can be caused, the health of human bodies is influenced, most of the existing modes for treating the waste gas in the spray booth adopt physical treatment methods, the treatment effect of the physical treatment methods is not obvious, the maintenance cost is high, and the waste gas cannot be recycled.
Disclosure of Invention
According to aspects of the invention, a paint spraying line waste gas adsorption concentration catalytic combustion treatment system is provided, which comprises a curing oven, a paint spraying room, a plurality of waste gas treatment modules, a catalytic combustion module and a discharge module, wherein the curing oven and the paint spraying room are respectively connected with the input ends of the waste gas treatment modules through pipelines, the catalytic combustion module is connected with the waste gas treatment modules through pipelines to form a circulation loop, the output end of the waste gas treatment module is connected with the discharge module through a pipeline, and the input end of the catalytic combustion module is connected with the discharge module through a pipeline;
the waste gas treatment module is configured to collect and purify waste gas generated by the curing oven and the paint spray booth;
the catalytic combustion module is configured to perform catalytic combustion on the exhaust gas treated by the exhaust gas treatment module;
the exhaust module is configured to exhaust the purified exhaust gas.
The invention provides catalytic combustion processing systems for paint spraying waste gas, which is characterized in that the system carries out purification processing for main pollutants VOCs, benzene, toluene, xylene, sulfuric acid mist, nitric acid mist and the like in the paint spraying waste gas, adopts an adsorption concentration process to concentrate low-concentration high-air-volume waste gas into high-concentration low-air-volume waste gas, then adopts a combustion mode to process the waste gas, removes partial paint mist particles through a water curtain cabinet under the negative pressure collection action generated by an adsorption fan, then collects the paint mist particles through an air pipe, enters a waste gas processing module to carry out purification processing, utilizes the hot air blowing-off action to concentrate low-concentration organic waste gas into high-concentration waste gas under the control of an automatic control system, and finally converts the organic gas into carbon dioxide and water through catalytic combustion equipment to be discharged into the atmosphere, thereby realizing the regeneration of active carbon, and being capable of being reused.
In , the waste gas treatment module comprises a spray tower, a filter and an activated carbon adsorption bed, the spray tower, the filter and the activated carbon adsorption bed are sequentially connected by pipelines, the curing oven and the paint spray booth are connected with the spray tower by pipelines, the activated carbon adsorption bed and the catalytic combustion module form a circulation loop, and the output end of the activated carbon adsorption bed is connected with the exhaust module by a pipeline.
Therefore, the waste gas is collected in a negative pressure state, the waste gas is collected through a pipeline, enters the spray tower to remove most paint mist dust particles, then enters the filter to remove water vapor brought out of the spray tower and escaping paint mist dust particles, and then is continuously adsorbed to pollutants such as organic matters in the waste gas by using the activated carbon adsorption bed under the control of the automatic control system.
In , the catalytic combustion module comprises a catalytic combustor and a desorption fan, the catalytic combustor and the desorption fan are connected by a pipeline, the desorption fan is respectively connected with the discharge module and the activated carbon adsorption bed by a pipeline, and the catalytic combustor is connected with the activated carbon adsorption bed by a pipeline.
Therefore, a heating chamber is arranged in the catalytic combustion device, the heating device is started to enter an internal circulation mode, when a hot gas source reaches the boiling point of organic matters, the organic matters run out of the adsorbent and enter the catalytic chamber to be catalytically decomposed into CO2 and H2O, and simultaneously, the heating device stops working completely when the released energy enters the adsorption box again to be desorbed, organic waste gas is spontaneously combusted in the catalytic combustion chamber and is circulated until the organic matters are separated from the inside of the adsorbent completely, the adsorbent is regenerated until the catalytic chamber is decomposed, and the organic matters are subjected to catalytic decomposition treatment. .
In , a dust-removing flame arrester is arranged on the connecting pipeline between the catalytic combustion module and the desorption fan, and a dust-removing flame arrester is arranged on the connecting pipeline between the catalytic combustion module and the activated carbon adsorption bed.
Therefore, the catalytic combustion device consists of a main machine, a fan and an electric control cabinet, wherein the main machine consists of a heat exchanger, a catalytic bed, an electric heating element, a dust-removing flame arrester, an explosion-proof device and the like. Organic gas resolved from saturated adsorbent is sent into a purification device under the action of a desorption fan, firstly passes through a dust removal flame arrester system, then enters a heat exchanger, and is sent into a heating chamber, the gas reaches the combustion reaction temperature through a heating device, then the organic gas is decomposed into CO2 and H2O under the action of a catalytic bed, and then enters the heat exchanger to exchange heat with low-temperature gas, so that the temperature of the entering gas is raised to reach the reaction temperature, if the reaction temperature cannot be reached, the heating system can realize compensation heating through a central control system, and the gas is completely combusted.
In , the exhaust module comprises an adsorption fan and a chimney, the adsorption fan and the chimney are connected by a pipeline, the adsorption fan is connected with an activated carbon adsorption bed pipeline, and the chimney is connected with a desorption fan pipeline.
Therefore, in the discharge module, the adsorption fan enables the pipeline to generate negative pressure, and clean air generated after treatment is discharged out of the atmosphere through a chimney.
In , the nitrogen protection module is piped into the activated carbon adsorption bed.
From this, insert the nitrogen protection module through the pipeline and can protect this processing system in the active carbon adsorption bed.
the system further comprises a water curtain cabinet, which is disposed on the connection pipeline of the curing oven, the paint spray booth and the spray tower.
From this, the cascade cabinet carries out the primary washing to waste gas, reinforcing purifying effect.
According to another aspects of the present invention, there is provided a processing method, comprising the paint line exhaust gas adsorption concentration catalytic combustion processing system, further comprising an exhaust gas processing flow and an acid mist processing flow, specifically comprising the steps of:
s1, treating the waste gas,
s1.1, waste gas collection: collecting waste gas of a curing furnace and a paint spray booth, inputting the waste gas into a waste gas treatment module, and carrying out primary washing through a water curtain cabinet;
s1.2, three-stage treatment: the waste gas is sequentially subjected to three-stage treatment through a spray tower, a filter and an active carbon adsorption bed, paint mist dust particles in the waste gas are removed in the spray tower and are input into the filter, water vapor and escaping paint mist dust particles in the waste gas are removed in the filter and are input into the active carbon adsorption bed, and the active carbon adsorption bed continuously adsorbs pollutants such as organic matters in the waste gas;
s1.3, desorption regeneration, namely inputting parts of waste gas treated by an activated carbon adsorption bed into a catalytic combustion module, combusting the parts of waste gas by the catalytic combustion module and inputting the parts of waste gas into the activated carbon adsorption bed, concentrating low-concentration organic waste gas into high-concentration waste gas by utilizing the hot air stripping effect, and converting the organic gas into carbon dioxide and water by the catalytic combustion module;
s1.4, discharging: discharging carbon dioxide and water from the atmosphere by a discharge module;
s2, treating the mixture by acid mist,
s2.1, acid mist: collecting acid mist of the curing oven and the paint spraying room, directly inputting the acid mist into a spray tower, and washing the acid mist by the spray tower to convert the acid mist into clean air;
s2.2, discharging: and discharging the cleaned air out of the atmosphere through the discharging module.
The invention also provides treatment methods for the paint spraying waste gas, which are used for purifying main pollutants VOCs, benzene, toluene, xylene, sulfuric acid mist, nitric acid mist and the like in the paint spraying waste gas by using the paint spraying line waste gas adsorption, concentration and catalytic combustion treatment system, and the method is used for treating the paint spraying waste gas to generate water and carbon dioxide.
The invention has the beneficial effects that: the invention adopts an advanced and reliable waste gas treatment process and method; the facility layout of the system is reasonable and beautiful; the system adopts a treatment process which is simple to operate and convenient to maintain and manage; the system reduces the reconstruction cost to the maximum extent according to the waste gas treatment characteristics; the system adopts a mature, safe and reliable treatment process to ensure the stable operation of the waste gas treatment system; the invention can be constructed without affecting the normal production of the factory; the invention reduces secondary pollution, the system runs stably and reliably, saves energy and reduces consumption; the service life is long.
Drawings
FIG. 1 is a schematic plan view of a spray painting line exhaust adsorption concentration catalytic combustion treatment system according to an embodiment of the present invention.
FIG. 2 is a schematic plan view of a portion of the modules of the paint line exhaust adsorption, concentration, catalytic combustion treatment system of FIG. 1.
FIG. 3 is a schematic flow chart of a method for treating exhaust gas of the exhaust gas adsorption, concentration and catalytic combustion treatment system of the paint spray line shown in FIG. 1.
FIG. 4 is a schematic flow chart of a method for treating acid mist of the exhaust gas adsorption, concentration and catalytic combustion treatment system of the paint spray line shown in FIG. 1.
Reference numbers in the figures: 11-a curing furnace, 12-a paint spray booth, 2-a waste gas treatment module, 21-a spray tower, 22-a filter, 23-an activated carbon adsorption bed, 3-a catalytic combustion module, 31-a catalytic combustor, 32-a desorption fan, 33-a dust removal flame arrester, 4-a discharge module, 41-an adsorption fan, 42-a chimney, 5-a nitrogen protection module and 6-a water curtain cabinet.
Detailed Description
The present invention is further described in detail below with reference to the attached figures.
FIG. 1 schematically shows a paint spraying line waste gas adsorption concentration catalytic combustion treatment system according to embodiments of the invention, which comprises a curing oven 11, a paint spraying room 12, a plurality of waste gas treatment modules 2, a catalytic combustion module 3 and an exhaust module 4, wherein the curing oven 11 and the paint spraying room 12 are respectively connected with the input ends of the waste gas treatment modules 2 through pipelines, and the output pipelines of the curing oven 11 and the paint spraying room 12 are respectively provided with a regulating valve;
the waste gas treatment module 2 is configured to collect and purify waste gas generated by the curing oven 11 and the paint spray booth 12;
the catalytic combustion module 3 is configured to perform catalytic combustion on the exhaust gas treated by the exhaust gas treatment module 2;
the exhaust module 4 is configured to exhaust the exhaust gas after the purification treatment.
The invention provides catalytic combustion processing systems for paint spraying waste gas, which is characterized in that the system carries out purification processing for main pollutants VOCs, benzene, toluene, xylene, sulfuric acid mist, nitric acid mist and the like in the paint spraying waste gas, adopts an adsorption concentration process to concentrate low-concentration high-air-volume waste gas into high-concentration low-air-volume waste gas, then adopts a combustion mode to process the waste gas, removes partial paint mist particles through a water curtain cabinet 6 under the negative pressure collection action generated by an adsorption fan 41, collects the paint mist particles through an air pipe, enters a waste gas processing module 2 for purification processing, utilizes the hot air blowing-off action to concentrate low-concentration organic waste gas into high-concentration waste gas under the control of an automatic control system, and finally converts the organic gas into carbon dioxide and water through catalytic combustion equipment to be discharged into the atmosphere, thereby realizing the regeneration of active carbon and being capable of being continuously reused.
Referring to fig. 1-2, the off-gas treatment module 2 includes a spray tower 21, a filter 22, and an activated carbon adsorption bed 23. The spray tower 21, the filter 22 and the active carbon adsorption bed 23 are sequentially connected by pipelines; the curing oven 11 and the paint spray booth 12 are connected with the spray tower 21 through pipelines, the activated carbon adsorption bed 23 and the catalytic combustion module 3 form a circulation loop, and a plurality of high-temperature sealed valves are arranged on the circulation loop; the output end of the active carbon adsorption bed 23 is connected with the discharge module 4 by a pipeline, and the pipeline is also provided with a high-temperature sealed valve.
The spray tower 21 is named as a spray dust removal tower, waste gas enters the spray tower 21 from an air inlet below a tower body of the spray tower 21 along a tangential direction, the space of an air inlet section is quickly filled under the power action of a fan, the gas rises to enter an -level spray section, absorption liquid is sprayed out from uniformly distributed nozzles at a high speed in the spray section to form countless fine fog drops, and dust particles are fully mixed and contacted with the gas when meeting sprayed water drops, water films or wet wall and devices, so that the gas is separated from the gas and the aim of purifying the gas is fulfilled.
When waste gas from the spray tower 21 enters a demister channel, due to deflection of a streamline, gas-liquid separation is realized under the action of inertia force carried by gas flow, partial liquid drops are captured when impacting demister blades, the liquid drops are collected on the demister blades continuously and return to a washing tank under the action of self gravity to degree, solid matters remained on the demister blades are also recovered to the washing tank under the action of washing water, so that the circulating working demister can play a role in demisting and purifying and cannot be blocked due to self scaling, and normal work of the system is influenced.
The baffle plate demister is also called as a wave plate demister, and the demister is an important process for separation of gas-liquid in the industrial production process and the discharge process of industrial waste gas, and the mist or dust entrained in the gas phase is separated in the process production operation of many products, so that the production can be normally and smoothly carried out, and the particle diameter of the mist or dust is very small, for example, the particle diameter of the mechanically generated mist is 1.0-150 mu m, and the particle diameter of the mist generated by the condensation is 0.10-30 mu m, so that the mist or dust is separated.
The paint mist filtering cotton is mainly made of glass fiber paint mist filtering cotton, which is also called glass fiber fluffy felt, a paint blocking net and a glass fiber filter screen. The paint mist filter is applied to surface spraying and high-quality paint mist filtering; PA-50/PA-100 is particularly suitable for use in heat recovery systems; the long glass fiber is made in a non-woven manner, so that the ventilation capacity is large, the resistance is small, and the paint mist dust-catching efficiency is good; a high strength glass fiber incremental structure; the windward side is green, and the air outlet side is white; the low compression performance keeps the shape of the filter unchanged, so that the filter fiber is completely beneficial to storing oil mist dust.
The honeycomb activated carbon adsorption method is adopted, namely, the waste gas is contacted with porous activated carbon with a large surface, and pollutants in the waste gas are adsorbed and decomposed, thereby playing a role of purification, and the pollutants which can be removed by the honeycomb activated carbon in different degrees are nitrogen oxide, carbon tetrachloride, chlorine, benzene, diformaldehyde, acetone, ethanol, ether, methanol, acetic acid, ethyl ester, styrene, phosgene, malodorous gas and the like, the modified honeycomb activated carbon impregnated by a chemical reagent can achieve high adsorption efficiency and high regeneration efficiency, can achieve high adsorption efficiency of acid mercaptan, amine, sulfur dichloride, hydrogen sulfide, ammonia, mercury, carbon, mercury, and the like, can achieve high adsorption efficiency of the pollutants, can be removed, and can not reach high regeneration efficiency even after the pollutants are concentrated, and the pollutants can not reach high concentration, and can be removed by a few times according to the concentration requirements after the combustion.
Referring to fig. 1, the catalytic combustion module 3 includes a catalytic combustor 31 and a desorption fan 32, the catalytic combustor 31 and the desorption fan 32 are connected by a pipeline, the desorption fan 32 is respectively connected with the discharge module 4 and the activated carbon adsorption bed 23 by a pipeline, and the catalytic combustor 31 is connected with the activated carbon adsorption bed 23 by a pipeline.
The catalytic combustion device is internally provided with a heating chamber, the heating device is started and enters an internal circulation mode, when a hot gas source reaches the boiling point of organic matters, the organic matters run out of the adsorbent and enter the catalytic chamber to be catalytically decomposed into CO2 and H2O, and simultaneously, the capacity is released, when the released energy enters the adsorption box again for desorption, the heating device stops working completely, organic waste gas maintains spontaneous combustion in the catalytic combustion chamber and circulates until the organic matters are separated from the inside of the adsorbent completely and decomposed in the catalytic chamber, the adsorbent is regenerated, and the organic matters are subjected to catalytic decomposition treatment.
Referring to fig. 1, a dust-removing flame arrester 33 is arranged on a connecting pipeline between the catalytic combustion module 3 and the desorption fan 32, and a dust-removing flame arrester 33 is arranged on a connecting pipeline between the catalytic combustion module 3 and the activated carbon adsorption bed 23.
The catalytic combustion device consists of a main machine, a fan and an electric control cabinet, wherein the main machine consists of a heat exchanger, a catalytic bed, an electric heating element, a dust-removing flame arrester 33, an explosion-proof device and the like. Organic gas resolved from saturated adsorbent is sent into a purification device under the action of a desorption fan 32, firstly passes through a dust removal flame arrester 33 system, then enters a heat exchanger, then is sent into a heating chamber, the gas reaches the combustion reaction temperature through a heating device, then is decomposed into CO2 and H2O under the action of a catalytic bed, and then enters the heat exchanger to exchange heat with low-temperature gas, so that the temperature of the entering gas is increased to reach the reaction temperature, if the reaction temperature cannot be reached, the heating system can realize compensation heating through a central control system, and the gas is completely combusted.
In the catalytic combustion module 3, metal palladium and glass are plated on a ceramic carrier to be used as a catalyst, so that the purification efficiency is high, the service life of the catalyst is long, the air flow is smooth, and the resistance is small. The catalytic combustion module 3 is provided with a dust removal flame arrester 33, a pressure relief opening, an overtemperature alarm and other protection facilities. Power drain: when the device starts to work, the device is preheated for 15-30 minutes and heated at full power, and only the power of a fan is consumed when the device works normally. When the concentration of the waste gas is low, the heating is automatically and intermittently supplemented.
Referring to fig. 1, the exhaust module 4 includes an adsorption fan 41 and a chimney 42, the adsorption fan 41 and the chimney 42 are connected by a pipeline, the adsorption fan 41 is connected by a pipeline to the activated carbon adsorption bed 23, and the chimney 42 is connected by a pipeline to the desorption fan 32. In the exhaust module 4, the adsorption fan 41 generates negative pressure in the duct, and the clean air generated after the treatment is exhausted to the atmosphere through the chimney 42.
Referring to fig. 1, the nitrogen protection module 5 is connected to the activated carbon adsorption bed 23 through a pipe. The nitrogen protection module 5 inputs nitrogen into each pipeline, and the treatment system can be protected.
Referring to fig. 1, the system further comprises a water curtain cabinet 6, wherein the water curtain cabinet 6 is arranged on a pipeline connecting the curing oven 11, the paint spray booth 12 and the spray tower 21. The water curtain cabinet 6 carries out primary washing to waste gas, strengthens purifying effect.
In the embodiment, the paint spraying waste gas of a certain factory is treated, and with reference to fig. 1, the main pollutants of the waste gas generated by the paint spraying and cleaning of the factory comprise VOCs, benzene, toluene, xylene, sulfuric acid mist, nitric acid mist and the like, and areas of the factory generating the above waste gas comprise six sets of two bottom paint rooms (paint rooms 12), two finish paint rooms (paint rooms 12), two paint repairing rooms (paint rooms 12) and a curing oven 11 .
According to the factory condition, the waste gas treatment module 2 in the embodiment is provided with two sets, in the circulation loop formed by the activated carbon adsorption beds 23 and the catalytic combustion module 3, the ends of the two activated carbon adsorption beds 23 are respectively connected with the desorption fan 32 through pipelines, and the other ends of the two activated carbon adsorption beds 23 are respectively connected with the catalytic combustion equipment, so that the circulation loop is formed, and the desorption effect is increased.
After the waste gas is treated by corresponding waste gas treatment equipment, the emission source strength of an exhaust cylinder of sulfuric acid mist and nitric acid mist (measured by NOx) can reach the emission standard of an exhaust cylinder of electroplating pollutant emission standard (GB21900-2008), the emission source strength of an exhaust cylinder of paint mist and xylene pollutants can reach the process waste gas atmospheric pollutant limit value of the second time period of atmospheric pollutant emission limit (DB44/27-2001) in Dong province, and the emission source strength of a VOCs exhaust cylinder can reach the requirement of the pollutant limit value of the second time period of the exhaust cylinder of surface coating (automobile manufacturing industry) volatile organic compound emission standard (DB 44/816-2010) in Dong province.
This paint spraying line waste gas adsorbs concentrated catalytic combustion processing system's exhaust-gas treatment flow and acid mist treatment flow, specifically includes the following step:
s1, exhaust gas treatment (fig. 3):
s1.1, collecting waste gas, collecting the waste gas of a curing furnace 11 and a paint spray booth 12, inputting the waste gas into a waste gas treatment module 2, and carrying out primary washing through a water curtain cabinet 6;
s1.2, performing three-stage treatment, namely performing three-stage treatment on the waste gas sequentially through a spray tower 21, a filter 22 and an activated carbon adsorption bed 23.
S1.2.1, removing paint mist and dust particles from waste gas in a spray tower 21 and inputting the paint mist and dust particles into a filter 22;
s1.2.2, removing the water vapor and escaping paint mist dust particles in the spray tower 21 by the waste gas in the filter 22 and inputting the water vapor and the escaping paint mist dust particles into the activated carbon adsorption bed 23,
s1.2.3, the active carbon adsorption bed 23 continuously adsorbs pollutants such as organic matters in the waste gas;
s1.3, desorption regeneration, inputting parts of waste gas treated by the activated carbon adsorption bed 23 into the catalytic combustion module 3, combusting the parts of waste gas by the catalytic combustion module 3 and inputting the parts of waste gas into the activated carbon adsorption bed 23, concentrating low-concentration organic waste gas into high-concentration waste gas by utilizing the hot air stripping effect, and converting the organic gas into carbon dioxide and water by the catalytic combustion module 3;
s1.4, discharging, namely discharging the carbon dioxide and water into the atmosphere by a discharge module 4;
s2, acid mist treatment (as shown in FIG. 4):
s2.1, collecting acid mist of the curing oven 11 and the paint spray booth 12, directly inputting the acid mist into a spray tower 21, and washing the acid mist by the spray tower 21 to convert the acid mist into clean air;
and S2.2, discharging, namely directly discharging the cleaned clean air out of the atmosphere through the discharging module 4.
The invention also provides treatment methods for the paint spraying waste gas, which are used for purifying main pollutants VOCs, benzene, toluene, xylene, sulfuric acid mist, nitric acid mist and the like in the paint spraying waste gas by using the paint spraying line waste gas adsorption, concentration and catalytic combustion treatment system, and the method is used for treating the paint spraying waste gas to generate water and carbon dioxide.
The invention has the beneficial effects that: the invention adopts an advanced and reliable waste gas treatment process and method; the facility layout of the system is reasonable and beautiful; the system adopts a treatment process which is simple to operate and convenient to maintain and manage; the system reduces the reconstruction cost to the maximum extent according to the waste gas treatment characteristics; the system adopts a mature, safe and reliable treatment process to ensure the stable operation of the waste gas treatment system; the invention can be constructed without affecting the normal production of the factory; the invention reduces secondary pollution, the system runs stably and reliably, saves energy and reduces consumption; the service life is long.
It will be apparent to those skilled in the art that many changes and modifications can be made without departing from the inventive concept herein, which is intended to be limited only to .
Claims (8)
1. Spray paint line waste gas adsorbs concentrated catalytic combustion processing system, including curing oven (11), spray paint room (12), its characterized in that still includes a plurality of exhaust-gas treatment modules (2), catalytic combustion module (3) and exhaust module (4), curing oven (11) and spray paint room (12) are connected with the input of a plurality of exhaust-gas treatment modules (2) respectively through the pipeline, catalytic combustion module (3) and a plurality of exhaust-gas treatment module (2) pipe connection and form circulation circuit, the output and the exhaust module (4) pipe connection of exhaust-gas treatment module (2), the input and the exhaust module (4) pipe connection of catalytic combustion module (3);
the waste gas treatment module (2) is configured to collect and purify waste gas generated by the curing oven (11) and the paint spray booth (12);
the catalytic combustion module (3) is configured to perform catalytic combustion on the exhaust gas treated by the exhaust gas treatment module (2);
the exhaust module (4) is configured to exhaust the purified exhaust gas.
2. The paint spraying line waste gas adsorption, concentration and catalytic combustion treatment system as claimed in claim 1, wherein the waste gas treatment module (2) comprises a spray tower (21), a filter (22) and an activated carbon adsorption bed (23), the spray tower (21), the filter (22) and the activated carbon adsorption bed (23) are sequentially connected through pipelines, the curing oven (11) and the paint spraying room (12) are connected with the spray tower (21) through pipelines, the activated carbon adsorption bed (23) and the catalytic combustion module (3) form a circulation loop, and the output end of the activated carbon adsorption bed (23) is connected with the exhaust module (4) through a pipeline.
3. The paint spraying line waste gas adsorption, concentration and catalytic combustion treatment system according to claim 2, wherein the catalytic combustion module (3) comprises a catalytic combustor (31) and a desorption fan (32), the catalytic combustor (31) and the desorption fan (32) are connected through a pipeline, the desorption fan (32) is respectively connected with the discharge module (4) and the activated carbon adsorption bed (23) through a pipeline, and the catalytic combustor (31) is connected with the activated carbon adsorption bed (23) through a pipeline.
4. The paint spraying line waste gas adsorption, concentration and catalytic combustion treatment system as claimed in claim 3, wherein a dust removal flame arrester (33) is arranged on a connecting pipeline between the catalytic combustion module (3) and the desorption fan (32), and a dust removal flame arrester (33) is arranged on a connecting pipeline between the catalytic combustion module (3) and the activated carbon adsorption bed (23).
5. The paint spraying line waste gas adsorption, concentration and catalytic combustion treatment system according to claim 3, characterized in that the exhaust module (4) comprises an adsorption fan (41) and a chimney (42), the adsorption fan (41) and the chimney (42) are connected through a pipeline, the adsorption fan (41) is connected with the activated carbon adsorption bed (23) through a pipeline, and the chimney (42) is connected with the desorption fan (32) through a pipeline.
6. The paint line exhaust gas adsorption, concentration and catalytic combustion treatment system according to any of claims 2-5, wherein the nitrogen protection module (5) is piped into the activated carbon adsorption bed (23).
7. The paint spraying line waste gas adsorption, concentration and catalytic combustion treatment system as claimed in claim 6, further comprising a water curtain cabinet (6), wherein the water curtain cabinet (6) is arranged on a pipeline connecting the curing oven (11), the paint spray booth (12) and the spray tower (21).
8. The treatment method comprises the paint spraying line waste gas adsorption, concentration and catalytic combustion treatment system of claim 7, and further comprises a waste gas treatment process and an acid mist treatment process, and specifically comprises the following steps:
s1, treating the waste gas,
s1.1, waste gas collection: collecting waste gas of a curing oven (11) and a paint spray booth (12), inputting the waste gas into a waste gas treatment module (2), and carrying out primary washing through a water curtain cabinet (6);
s1.2, three-stage treatment: the waste gas sequentially passes through the spray tower (21), the filter (22) and the activated carbon adsorption bed (23) to be subjected to three-stage treatment, the waste gas is subjected to paint mist dust particles removal in the spray tower (21) and is input into the filter (22), the waste gas is subjected to water vapor and escaping paint mist dust particles removal in the spray tower (21) and is input into the activated carbon adsorption bed (23), and the activated carbon adsorption bed (23) continuously adsorbs pollutants such as organic matters in the waste gas;
s1.3, desorption regeneration, namely inputting parts of waste gas treated by the activated carbon adsorption bed (23) into a catalytic combustion module (3), combusting the parts of waste gas by the catalytic combustion module (3) and inputting the parts of waste gas into the activated carbon adsorption bed (23), concentrating the low-concentration organic waste gas into high-concentration waste gas by utilizing the hot air stripping effect, and converting the organic gas into carbon dioxide and water by the catalytic combustion module (3);
s1.4, discharging: discharging carbon dioxide and water from the atmosphere by the discharge module (4);
s2, treating the mixture by acid mist,
s2.1, acid mist: acid mist of the curing oven (11) and the paint spray booth (12) is collected and directly input into a spray tower (21), and the spray tower (21) washes the acid mist and converts the acid mist into clean air;
s2.2, discharging: and discharging the washed clean air to the atmosphere directly through the discharge module (4).
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