CN109432944A - Spray the purification concentration cycles method and system of exhaust gas - Google Patents

Spray the purification concentration cycles method and system of exhaust gas Download PDF

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Publication number
CN109432944A
CN109432944A CN201811637005.XA CN201811637005A CN109432944A CN 109432944 A CN109432944 A CN 109432944A CN 201811637005 A CN201811637005 A CN 201811637005A CN 109432944 A CN109432944 A CN 109432944A
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China
Prior art keywords
exhaust gas
spray
slag
gas
spraying
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CN201811637005.XA
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Chinese (zh)
Inventor
吴举
陈强
吕明亮
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Qinhuangdao Green Environmental Engineering Co Ltd
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Qinhuangdao Green Environmental Engineering Co Ltd
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Priority to CN201811637005.XA priority Critical patent/CN109432944A/en
Publication of CN109432944A publication Critical patent/CN109432944A/en
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D53/00Separation 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
    • B01D53/02Separation 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
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D50/00Combinations of methods or devices for separating particles from gases or vapours
    • B01D50/60Combinations of devices covered by groups B01D46/00 and B01D47/00
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D53/00Separation 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
    • B01D53/14Separation 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 absorption
    • B01D53/1425Regeneration of liquid absorbents
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D53/00Separation 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
    • B01D53/14Separation 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 absorption
    • B01D53/1487Removing organic compounds
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23GCREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
    • F23G7/00Incinerators or other apparatus for consuming industrial waste, e.g. chemicals
    • F23G7/06Incinerators or other apparatus for consuming industrial waste, e.g. chemicals of waste gases or noxious gases, e.g. exhaust gases
    • F23G7/07Incinerators 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
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D2257/00Components to be removed
    • B01D2257/70Organic compounds not provided for in groups B01D2257/00 - B01D2257/602
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02ATECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A50/00TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
    • Y02A50/20Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters

Abstract

The invention discloses it is a kind of spray exhaust gas purification concentration cycles method and system, this method include spray, demisting, filtering, adsorption and desorption, catalysis burn and etc..The system includes spray unit, paint removal slag unit and organic matter removal unit.Spray unit is connect with paint removal slag unit, and paint removal slag unit is connect with organic matter removal unit, the air inlet connection of organic matter removal unit and spray unit.Exhaust gas is sprayed after this method and system purification, can remove the particles such as paint slag, through organic matter removal unit by organic matter Adsorption, each index of gas meets spray room air feed requirement after purification.Desorption gas is handled through catalytic burning device, and the property of will volatilize organic matter decomposes and generates heat, can be used for the desorption of organic matter.Energy consumption and water consumption can be reduced using the purification concentration cycles method and system of the spraying exhaust gas, extends service life of equipment, reduces equipment investment, reduces equipment operating cost, avoids volatile organic matter discharge pollution environment.

Description

Spray the purification concentration cycles method and system of exhaust gas
Technical field
The invention belongs to environment protection fields, are related to the processing that spraying industrial process generates exhaust gas, in particular to a kind of spraying is useless The purification concentration cycles method and system of gas.
Background technique
Spraying is to make paint atomizing by spray gun, and the processing method coated on body surface is mainly used for adamant body surface The drafting of face pattern and character.Spraying is divided into compressed-air spraying, a variety of without air spray painting, electrostatic painting etc..Spraying operation production It is high-efficient, it is suitable for handwork and industrial automation produces, having a wide range of application mainly has hardware, plastic cement, furniture, military project, ship The fields such as oceangoing ship are now using a kind of most common coating mode.
The coating cloud that the spraying exhaust gas generated in spraying process contains high degree of dispersion and the solvent evaporated, it is such as untreated It just emits, both pollutes environment, be unfavorable for human health, and waste coating, cause economic loss.For controlling for spraying exhaust gas On the one hand reason needs to remove the coating cloud of wherein high degree of dispersion, on the other hand needs light-concentration volatile organic solvent therein It is handled.
Removal for the coating cloud of high degree of dispersion in spraying exhaust gas, the prior art mainly adopts spray plus demisters.It will It sprays exhaust gas and introduces purifying column, spray section is equipped with spray head, and water sprays from top to bottom by spray head, to spraying exhaust gas from bottom to top It is washed, the coating cloud sprayed in exhaust gas is washed with water out, is formed paint slag, is realized the separation of coating cloud.It is steamed containing remaining coating cloud and water The spraying exhaust gas of gas enters back into demisting section, and remaining coating cloud therein and vapor are removed.But there is spraying in the above-mentioned prior art Coating cloud and vapor removal are not thorough in exhaust gas, the big problem of spray-water amount.
Processing for light-concentration volatile organic solvent in spraying exhaust gas, the prior art mainly adopts absorption methods using boiling Stone runner Adsorption Concentration, the direct outlet of gas after absorption, then be desorbed with a small amount of hot gas, the high concentration got off is desorbed Exhaust gas carries out burning improvement using accumulation of heat incinerator, the direct outlet of the gas after burning.There is spraying gas supply in the above-mentioned prior art Filtration, purification is at high cost, and gas supply heating need to consume energy, the unused problem of heat after high-concentration waste gas burning.
In conclusion there are coating cloud removals to be not thorough for the treatment process of current spraying exhaust gas, water consumption is big, and vapor is gone Except being not thorough, the problems such as spraying gas supply filtration, purification and heating cost are high, and heat utilization is insufficient, it is therefore desirable to invent a kind of spray Waste gas purification concentration cycles method and system are applied, to improve coating cloud removal rate, water consume and energy consumption is reduced, makes full use of burned waste gas The heat of generation.
Summary of the invention
The object of the present invention is to provide a kind of spraying waste gas purification concentration cycles method and system, using this method and System can be improved coating cloud removal rate, reduce water consume and energy consumption, improve utilization rate of waste heat.
In order to solve the above technical problem, the present invention provides a kind of spraying waste gas purification concentration cycles methods, such as Fig. 1 institute Show, the spraying waste gas purification concentration cycles method the following steps are included:
A, it sprays: spraying exhaust gas is passed through to the lower part of spray equipment, spray liquid enters from spray equipment top, useless to spraying Gas carries out countercurrent washing, and the coating cloud sprayed in exhaust gas is intercepted by spray liquid, obtains the spraying exhaust gas of paint removal slag, carries paint slag Spray liquid flows out spray equipment;
B, paint removal slag: the spray liquid of the carrying paint slag of step a outflow spray equipment is collected into storage pool, A, B is added Reagent makes to paint slag coagulation, the paint slag of coagulation be pulled out, the spray liquid after being purified, and circulation is used for the spray of step a;
C, demisting: by the spraying exhaust gas for removing paint removal slag of step a by demister, steam therein is removed, is removed The spraying exhaust gas of steam;
D, it filters: the spraying exhaust gas of the removal steam of step c is passed sequentially through into micron order demister, filter cotton, filter bag, Steam, paint slag and dust particles therein are further removed, the exhaust gas containing volatile organic matter is obtained;
E, it adsorbs: the exhaust gas containing volatile organic matter of step d being passed through adsorbent equipment, by volatile organic matter therein Adsorption, the gas after being purified, purified gas recycle, and can be used as spraying process gas;
F, it is desorbed: the adsorbent equipment that hot gas is passed through the adsorption saturation of step e being carried out to the desorption of volatile organic matter, is obtained High-concentration organic waste gas, the adsorbent equipment after desorption are used for the absorption of step e;
G, catalysis burning: the obtained high-concentration organic waste gas of step f is passed through catalytic combustion system, volatility therein has Machine object is oxidized decomposition, and generates heat, obtains hot gas, can be used for the desorption of step f.
The volume flow ratio that the spraying exhaust gas and spray liquid of the step a enters spray equipment is 300~800:1.
The adding manner of A, B reagent of the step b includes that stream adds, flow acceleration 2.0Lm-3h-1~10.0Lm-3h-1
The operation temperature of the step e absorption is 0 DEG C~40 DEG C.
The temperature of hot gas used in the desorption of the step f is 90 DEG C~150 DEG C.
In order to solve the above technical problem, the present invention provides a kind of spraying waste gas purification concentration cycles systems, such as Fig. 2 institute Show, which includes spray unit, paint removal slag unit and organic matter removal unit.
The spray unit includes spray room, and the air inlet of the spray room is additionally provided with machice to supply fan, and air outlet is additionally provided with Exhaust fan.
The paint removal slag unit includes wet type paint removal slag tower, dry filter device, cyclic water tank, water circulating pump and slag making Pond.
The organic matter removal unit includes the first adsorption box, the second adsorption box, catalytic combustion system, desorption blower and valve Door.
First adsorption box and the second adsorption box are provided with adsorbent, and the adsorbent includes active carbon, molecular sieve, boiling Stone etc..Preferably, adsorbent of the active carbon as volatile organic solvent is selected.
The catalytic combustion system refers to the device to burn under the action of catalyst or equipment, its working principle is that by urging Agent makes organic exhaust gas carry out flameless combustion under lower initiation temperature, make organic exhaust gas be decomposed into nontoxic carbon dioxide and Water vapour.
The water outlet of the cyclic water tank of the paint removal slag unit is connect with the spray water inlet of wet type paint removal slag tower, recirculated water An at least water circulating pump, the waste liquid outlet of wet type paint removal slag tower and the water inlet in slag making pond are set between case and wet type paint removal slag tower Mouth connection, the water outlet in slag making pond and the water inlet of cyclic water tank connect, and are additionally provided with fresh water inlet, wet type on cyclic water tank The waste gas outlet of paint removal slag tower is connect with the exhaust gas inlet of dry filter device.
Three layers of spray equipment are provided in the wet type paint removal slag tower, positioned at the top of exhaust gas inlet, in spray equipment Demister is arranged in top.As shown in figure 3, the quantity of water circulating pump setting is 3, respectively with the water inlet of three layers of spray equipment Mouth connection.
Nozzle is installed, the nozzle is that commercially available spray uses nozzle on the spray equipment;It advanced optimizes, the spray Mouth includes commercially available atomizer.
Demister in the wet type paint removal slag tower is the demister of the prior art.
As shown in figure 4, setting gradually demister, filter cotton, filter bag in the dry filter device.The dry filter The demister of device includes micron order demister, and the filter cotton includes G4 filter cotton, and the filter bag includes F6 filter bag, F8 Filter bag.
The spraying exhaust gas that spray room generates is discharged by exhaust fan, containing a large amount of paint slag in the spraying exhaust gas, needs to pass through The removal of paint removal slag unit, spraying exhaust gas initially enter wet type paint removal slag tower, and wet type paint removal slag tower is equipped with three layers of spray, one layer of demisting Device sprays exhaust gas in tower after three layers of atomizing spray liquid countercurrent washing, and coating cloud therein is intercepted by spray liquid, carries paint slag Spray liquid flow to the bottom of wet type paint removal slag tower, then from flowing in slag making pond, A, B reagent is added into slag making pond and carries out to paint slag Coagulation, the water after coagulation, fishing Slag treatment return to cyclic water tank and recycle.By three layers of spray washing of the present invention It is can remove in spraying exhaust gas afterwards 98% with japanning slag.It goes also containing a large amount of steam in the spraying exhaust gas of paint removal slag, by demister The steam in exhaust gas can be removed afterwards.The spraying exhaust gas that the spraying waste gas outlet of wet type paint removal slag tower comes out enters back into dry filter dress It sets, which is equipped with micron order demister, G4 filter cotton, F6 filter bag, F8 filter bag, and spraying exhaust gas first passes through micron order and removes Day with fog, can be to the steam advanced treating in exhaust gas, and spraying exhaust gas can completely remove in spraying exhaust gas by micron order demister Steam, the spraying exhaust gas come out from micron order demister sequentially pass through G4 filter cotton, F6 filter bag, F8 filter bag and completely remove spray Apply remaining the paint slag, dust particles contained in exhaust gas.After spraying exhaust gas passes through paint removal slag unit, wherein the paint slag, the dust that contain Particle has been completely removed.
A, B reagent is the medicament for being commercially for removal coating cloud, also known as lacquer mist coagulant A and lacquer mist coagulant B.Example Such as, coating cloud flocculant A ingredient is high molecular surfactant etc., " can capture " to enter in recirculated water and cross spray painting, by coating cloud The functional group that chemical action is penetrated and destroyed in paint is wrapped up and passed through, it is made to completely eliminate stickiness;Coating cloud flocculant B is main By macromolecule cation polymer, the composition such as surfactant, according to " bridging " principle, table of the Polymer adsorption in coating cloud particle Face is adsorbed on the surface of another coating cloud particle again, assembles the coating cloud particle for disappearing glutinous by coating cloud flocculant A, ultimately forming can hold The sponge shape bulk floccule easily to float, convenient for salvaging.
First adsorption box of the organic matter removal unit is provided with exhaust gas inlet, waste gas outlet, desorption gas import and takes off Attached gas outlet, the second adsorption box are provided with exhaust gas inlet, waste gas outlet, desorption gas import and the outlet of desorption gas, the first adsorption box Exhaust gas inlet, waste gas outlet, desorption gas import, desorption gas outlet and the exhaust gas inlet of the second adsorption box, waste gas outlet, desorption Gas import and the outlet of desorption gas be provided with valve, the outlet of desorption gas and the outlet of desorption gas it is in parallel after with catalytic combustion system into The gas outlet of port connection, catalytic combustion system is connect with the air inlet of desorption blower, and desorption gas import and desorption gas import are simultaneously It is connect after connection with the air outlet of desorption blower.
As shown in figure 3, being additionally provided with air-introduced machine before the air inlet of the organic matter removal unit.
The organic matter removal unit includes at least two adsorption boxes, if the first adsorption box is in adsorbed state, exhaust gas The valve of import and waste gas outlet is in opening state, and desorption gas import and the valve that gas outlet is desorbed are in closed state;If Second adsorption box is in detachment status, then the valve of exhaust gas inlet and waste gas outlet is in closed state, and gas import is desorbed and takes off The valve of attached gas is in opening state.Vice versa.
First the hot gas of small air quantity is sent into adsorption box to get off the volatile organic compound desorption of absorption with desorption blower, The higher gas of the concentration containing volatile organic matter being desorbed enters in catalytic combustion system, by volatile organic matter therein Exhaustive oxidation decomposes, and the temperature for the gas that the gas outlet of catalytic combustion system 3-3 comes out can reach 150 DEG C, can be directly used for The desorption of adsorption box.
The spraying exhaust gas that dry filter device comes out is sent into the first adsorption box or the second adsorption box by air-introduced machine, and spraying is useless Volatile organic matter in gas is adsorbed by adsorbent, and the concentration of volatile organic matter can drop in the spraying exhaust gas by adsorption treatment To 10mg/m3, temperature is positively retained at 25 DEG C, and its humidity, cleanliness are all satisfied the air feed requirement of spray room, this portion gas Spray room is sent into as air feed by machice to supply fan.Compared with traditional treatment method, the purification and heating of spray room air feed can be substantially saved Cost and energy consumption.
The gas outlet of the spray room is connect with the exhaust gas inlet of wet type paint removal slag tower, the first adsorption box exhaust gas inlet and second It is connect after adsorption box exhaust gas inlet is in parallel with the waste gas outlet of dry filter, the first adsorption box waste gas outlet and the second adsorption box It is connect after waste gas outlet is in parallel with the air inlet of spray room.
Pass through the processing of paint removal slag unit and organic matter removal unit in the spraying exhaust gas that spray room generates, realizes gas It recycles, without any exhaust gas outlet, therefore the leakage rate of volatile organic matter is zero
As shown in figure 3, the inlet and outlet of the catalytic combustion system of the organic matter removal unit are additionally provided with fire arrester.It prevents Combustion flame in catalytic combustion system is excessive, causes danger.
Spraying waste gas purification concentration cycles method and system provided by the invention overcome and spraying confession exist in the prior art Gas filtration, purification is at high cost, gas supply heating need to consume energy, water consumption is big, high-concentration waste gas burn after heat do not utilize, Coating cloud and vapor removal are not thorough the problem big with spray-water amount, can provide better method to spray the processing of exhaust gas And device.
Detailed description of the invention
Fig. 1 is spraying waste gas purification concentration cycles method wire figure;
Fig. 2 is spraying waste gas purification concentration cycles system schematic;
Fig. 3 is preferred spraying waste gas purification concentration cycles system schematic;
Fig. 4 is dry filter schematic device;
Wherein:
1, spray unit, 2, paint removal slag unit, 3, organic matter removal unit;
1-1, spray room, 1-2, machice to supply fan, 1-3, exhaust fan;
2-1, wet type paint removal slag tower, 2-1-1, exhaust gas inlet, 2-1-2, waste gas outlet, 2-1-3, spray water inlet, 2-1- 4, waste liquid outlet, 2-1-5, spray equipment, 2-1-6, demister, 2-2, dry filter device, 2-2-1, exhaust gas inlet, 2-2-2, Waste gas outlet, 2-2-3, demister, 2-2-4, filter cotton, 2-2-5, filter bag, 2-3, cyclic water tank, 2-3-1, water outlet, 2- 3-2, water inlet, 2-3-3, fresh water inlet, 2-4, water circulating pump, 2-5, slag making pond;
3-1, the first adsorption box, 3-1-1, exhaust gas inlet, 3-1-2, waste gas outlet, 3-1-3, desorption gas import, 3-1-4, Gas outlet, 3-2, the second adsorption box, 3-2-1, exhaust gas inlet, 3-2-2, waste gas outlet, 3-2-3, desorption gas import, 3-2- is desorbed 4, desorption gas outlet, 3-3, catalytic combustion system, 3-3-1, air inlet, 3-3-2, gas outlet, 3-3-3, fire arrester, 3-4, desorption Blower, 3-5, air inducing blower.
Effect of the invention
Beneficial effect using spraying waste gas purification concentration cycles method and system of the invention is: 1. realizing to spraying Exhaust gas is effectively treated, and thoroughly, volatile organic matter is completely harmless after catalysis oxidation, and realizes at exhaust gas for the removal of paint slag The circulation comprehensive of water, air and heat amount during reason utilizes;2. can be completely removed using wet type paint removal slag tower and dry filter device Paint slag in exhaust gas, dust particle guarantee that subsequent processing device is not easy to plug, and increase the service life of equipment, reduce equipment Operating cost;3. it is administered to after the volatile organic matter Adsorption Concentration in exhaust gas by catalytic combustion system, and burning is generated Heat is fully utilized, and has the characteristics that low equipment investment, operating cost are low;4. the spraying after paint removal slag and absorption is useless Gas is changed into the gas suitable for spray room air feed, saves the operating cost of processing spray room air feed and the energy of heating;5. this hair There is no gas discharging in bright spraying waste gas purification concentration cycles system operation, avoids volatile organic matter in spraying process Pollution to environment;6. realizing the recycling of the spray-water of paint removal slag, water consumption is greatly decreased.
Specific embodiment
Embodiment 1
It is about 200mg/m that slag concentration is painted in the spraying exhaust gas generated in spray room3, volatile organic matter concentration is about 160mg/ m3, flow is about 60000m3/ h, is handled using following steps:
A, it sprays: spraying exhaust gas is passed through to the lower part of spray equipment, spray liquid enters from spray equipment top, spray liquid Flow is 200m3/h, carries out countercurrent washing to spraying exhaust gas, the coating cloud sprayed in exhaust gas is intercepted by spray liquid, obtains paint removal The spraying exhaust gas of slag, the spray liquid for carrying paint slag flow out spray equipment;
B, paint removal slag: the spray liquid of the carrying paint slag of step a outflow spray equipment is collected into storage pool, A, B is added Reagent, flow acceleration 2.0Lm-3h-1, make to paint slag coagulation, the paint slag of coagulation be pulled out, the spray liquid after being purified, recycled Spray for step a;
C, demisting: by the spraying exhaust gas for removing paint removal slag of step a by demister, steam therein is removed, is removed The spraying exhaust gas of steam;
D, it filters: the spraying exhaust gas of the removal steam of step c is passed sequentially through into micron order demister, G4 filter cotton, F6 mistake Steam therein, paint slag and dust particles are completely removed, obtain the exhaust gas containing volatile organic matter by filter bag, F8 filter bag;
E, it adsorbs: the exhaust gas containing volatile organic matter of step d being passed through adsorbent equipment, by volatile organic matter therein Adsorption, the gas after being purified, purified gas recycle, and the concentration of volatile organic matter will be 8mg/ m3, temperature is 0 DEG C, can be used as spraying process gas;
F, it is desorbed: the adsorbent equipment that 90 DEG C of hot gas is passed through the adsorption saturation of step e is subjected to the de- of volatile organic matter It is attached, obtain high-concentration organic waste gas, the concentration 3800mg/m of volatile organic matter3, the adsorbent equipment after desorption is used for step e Absorption;
G, catalysis burning: the obtained high-concentration organic waste gas of step f is passed through catalytic combustion system, volatility therein has Machine object is oxidized decomposition, and generates heat, obtains the hot gas that temperature is 110 DEG C, can be used for the desorption of step f.
Compared with the method for the prior art, spraying waste gas purification concentration cycles method of the invention can completely remove spraying Paint slag in exhaust gas, the removal rate of volatile organic matter reach 95%, and temperature, humidity and the cleanliness of purified exhaust gas are all satisfied The requirement of spray room air feed, can save the energy consumption 802kWh of air feed heating.Since the dust in spraying exhaust gas can be completely removed Impurity, the processing equipments such as grain are not easy to plug, and the service life of equipment can increase by 60%.Realize the circulation of the shower water of paint removal slag It uses, shower water consumption is made to reduce 97%.The heat that volatile organic compounds by catalytic combustion generates is used for the desorption of adsorption box, Desorption energy consumption 142.5kWh can be saved.In entire spraying waste gas treatment process, there is no exhaust gas outlet substantially, avoid spraying exhaust gas Pollution of the middle pollutant to environment.
Embodiment 2
It is about 300mg/m that slag concentration is painted in the spraying exhaust gas generated in spray room3, volatile organic matter concentration is about 200mg/ m3, flow is about 80000m3/ h, is handled using following steps:
A, it sprays: spraying exhaust gas is passed through to the lower part of spray equipment, spray liquid enters from spray equipment top, spray liquid Flow is 160m3/ h carries out countercurrent washing to spraying exhaust gas, and the coating cloud sprayed in exhaust gas is intercepted by spray liquid, obtains paint removal The spraying exhaust gas of slag, the spray liquid for carrying paint slag flow out spray equipment;
B, paint removal slag: the spray liquid of the carrying paint slag of step a outflow spray equipment is collected into storage pool, A, B is added Reagent, flow acceleration 4.5Lm-3h-1, make to paint slag coagulation, the paint slag of coagulation be pulled out, the spray liquid after being purified, recycled Spray for step a;
C, demisting: by the spraying exhaust gas for removing paint removal slag of step a by demister, steam therein is removed, is removed The spraying exhaust gas of steam;
D, it filters: the spraying exhaust gas of the removal steam of step c is passed sequentially through into micron order demister, G4 filter cotton, F6 mistake Steam therein, paint slag and dust particles are completely removed, obtain the exhaust gas containing volatile organic matter by filter bag, F8 filter bag;
E, it adsorbs: the exhaust gas containing volatile organic matter of step d being passed through adsorbent equipment, by volatile organic matter therein Adsorption, the gas after being purified, purified gas recycle, and the concentration of volatile organic matter will be 9mg/ m3, temperature is 40 DEG C, can be used as spraying process gas;
F, it is desorbed: the adsorbent equipment that 150 DEG C of hot gas is passed through the adsorption saturation of step e is subjected to the de- of volatile organic matter It is attached, obtain high-concentration organic waste gas, the concentration 4200mg/m of volatile organic matter3, the adsorbent equipment after desorption is used for step e Absorption;
G, catalysis burning: the obtained high-concentration organic waste gas of step f is passed through catalytic combustion system, volatility therein has Machine object is oxidized decomposition, and generates heat, obtains the hot gas that temperature is 120 DEG C, can be used for the desorption of step f.
Compared with the method for the prior art, spraying waste gas purification concentration cycles method of the invention can completely remove spraying Paint slag in exhaust gas, the removal rate of volatile organic matter reach 96%, and temperature, humidity and the cleanliness of purified exhaust gas are all satisfied The requirement of spray room air feed, can save the energy consumption 862kWh of air feed heating.Since the dust in spraying exhaust gas can be completely removed Impurity, the processing equipments such as grain are not easy to plug, and the service life of equipment can increase by 62%.Realize the circulation of the shower water of paint removal slag It uses, shower water consumption is made to reduce 98%.The heat that volatile organic compounds by catalytic combustion generates is used for the desorption of adsorption box, Desorption energy consumption 162.5kWh can be saved.In entire spraying waste gas treatment process, there is no exhaust gas outlet substantially, avoid spraying exhaust gas Pollution of the middle pollutant to environment.
Embodiment 3
It is about 400mg/m that slag concentration is painted in the spraying exhaust gas generated in spray room3, volatile organic matter concentration is about 220mg/ m3, flow is about 100000m3/ h, is handled using following steps:
A, it sprays: spraying exhaust gas is passed through to the lower part of spray equipment, spray liquid enters from spray equipment top, spray liquid Flow is 166m3/ h carries out countercurrent washing to spraying exhaust gas, and the coating cloud sprayed in exhaust gas is intercepted by spray liquid, obtains paint removal The spraying exhaust gas of slag, the spray liquid for carrying paint slag flow out spray equipment;
B, paint removal slag: the spray liquid of the carrying paint slag of step a outflow spray equipment is collected into storage pool, A, B is added Reagent, flow acceleration 7.0Lm-3h-1, make to paint slag coagulation, the paint slag of coagulation be pulled out, the spray liquid after being purified, recycled Spray for step a;
C, demisting: by the spraying exhaust gas for removing paint removal slag of step a by demister, steam therein is removed, is removed The spraying exhaust gas of steam;
D, it filters: the spraying exhaust gas of the removal steam of step c is passed sequentially through into micron order demister, G4 filter cotton, F6 mistake Steam therein, paint slag and dust particles are completely removed, obtain the exhaust gas containing volatile organic matter by filter bag, F8 filter bag;
E, it adsorbs: the exhaust gas containing volatile organic matter of step d being passed through adsorbent equipment, by volatile organic matter therein Adsorption, the gas after being purified, purified gas recycle, and the concentration of volatile organic matter will be 10mg/ m3, temperature is 23 DEG C, can be used as spraying process gas;
F, it is desorbed: the adsorbent equipment that 122 DEG C of hot gas is passed through the adsorption saturation of step e is subjected to the de- of volatile organic matter It is attached, obtain high-concentration organic waste gas, the concentration 4400mg/m of volatile organic matter3, the adsorbent equipment after desorption is used for step e Absorption;
G, catalysis burning: the obtained high-concentration organic waste gas of step f is passed through catalytic combustion system, volatility therein has Machine object is oxidized decomposition, and generates heat, obtains the hot gas that temperature is 150 DEG C, can be used for the desorption of step f.
Compared with the method for the prior art, spraying waste gas purification concentration cycles method of the invention can completely remove spraying Paint slag in exhaust gas, the removal rate of volatile organic matter reach 95%, and temperature, humidity and the cleanliness of purified exhaust gas are all satisfied The requirement of spray room air feed, can save the energy consumption 892kWh of air feed heating.Since the dust in spraying exhaust gas can be completely removed Impurity, the processing equipments such as grain are not easy to plug, and the service life of equipment can increase by 63%.Realize the circulation of the shower water of paint removal slag It uses, shower water consumption is made to reduce 98%.The heat that volatile organic compounds by catalytic combustion generates is used for the desorption of adsorption box, Desorption energy consumption 182.5kWh can be saved.In entire spraying waste gas treatment process, there is no exhaust gas outlet substantially, avoid spraying exhaust gas Pollution of the middle pollutant to environment.
Embodiment 4
It is about 500mg/m that slag concentration is painted in the spraying exhaust gas generated in spray room3, volatile organic matter concentration is about 300mg/ m3, flow is about 120000m3/h, it is handled using following steps:
A, it sprays: spraying exhaust gas is passed through to the lower part of spray equipment, spray liquid enters from spray equipment top, spray liquid Flow is 150m3/h, carries out countercurrent washing to spraying exhaust gas, the coating cloud sprayed in exhaust gas is intercepted by spray liquid, obtains paint removal The spraying exhaust gas of slag, the spray liquid for carrying paint slag flow out spray equipment;
B, paint removal slag: the spray liquid of the carrying paint slag of step a outflow spray equipment is collected into storage pool, A, B is added Reagent, flow acceleration 10.0Lm-3h-1, make to paint slag coagulation, the paint slag of coagulation be pulled out, the spray liquid after being purified, recycled Spray for step a;
C, demisting: by the spraying exhaust gas for removing paint removal slag of step a by demister, steam therein is removed, is removed The spraying exhaust gas of steam;
D, it filters: the spraying exhaust gas of the removal steam of step c is passed sequentially through into micron order demister, G4 filter cotton, F6 mistake Steam therein, paint slag and dust particles are completely removed, obtain the exhaust gas containing volatile organic matter by filter bag, F8 filter bag;
E, it adsorbs: the exhaust gas containing volatile organic matter of step d being passed through adsorbent equipment, by volatile organic matter therein Adsorption, the gas after being purified, purified gas recycle, and the concentration of volatile organic matter will be 12mg/ m3, temperature is 32 DEG C, can be used as spraying process gas;
F, it is desorbed: the adsorbent equipment that 131 DEG C of hot gas is passed through the adsorption saturation of step e is subjected to the de- of volatile organic matter It is attached, obtain high-concentration organic waste gas, the concentration 4600mg/m of volatile organic matter3, the adsorbent equipment after desorption is used for step e Absorption;
G, catalysis burning: the obtained high-concentration organic waste gas of step f is passed through catalytic combustion system, volatility therein has Machine object is oxidized decomposition, and generates heat, obtains the hot gas that temperature is 180 DEG C, can be used for the desorption of step f.
Compared with the method for the prior art, spraying waste gas purification concentration cycles method of the invention can completely remove spraying Paint slag in exhaust gas, the removal rate of volatile organic matter reach 95%, and temperature, humidity and the cleanliness of purified exhaust gas are all satisfied The requirement of spray room air feed, can save the energy consumption 922kWh of air feed heating.Since the dust in spraying exhaust gas can be completely removed Impurity, the processing equipments such as grain are not easy to plug, and the service life of equipment can increase by 61%.Realize the circulation of the shower water of paint removal slag It uses, shower water consumption is made to reduce 98%.The heat that volatile organic compounds by catalytic combustion generates is used for the desorption of adsorption box, Desorption energy consumption 172.5kWh can be saved.In entire spraying waste gas treatment process, there is no exhaust gas outlet substantially, avoid spraying exhaust gas Pollution of the middle pollutant to environment.
Embodiment 5
Spraying exhaust gas is handled using spraying waste gas purification concentration cycles system as shown in Figure 2, dry filter dress Set installation micron order demister, G4 filter cotton, F6 filter bag, F8 filter bag, the first adsorption box 3-1 and the second adsorption box in 2-2 Adsorbent in 3-2 is active carbon.
Flow into the spraying exhaust gas of wet type paint removal slag tower 2-1 is about 100000m3/h, and paint slag concentration is about 300mg/ m3, volatile organic matter concentration is about 200mg/m3.The flow of spray-water is 160m3/ h, the addition of A, B reagent in slag making pond Speed is 5Lm-3h-1.Exhaust gas is sprayed after wet type paint removal slag tower 2-1, therein 96% paint slag is removed, paint slag therein Concentration becomes 12mg/m3, after dry filter device 2-2, wherein the removal rate of paint slag and vapor reaches 100%.
Enter organic matter removal unit 3 through the purified spraying exhaust gas of paint removal slag unit 2, spraying exhaust gas is inhaled through active carbon It is attached, wherein 95% volatile organic matter is removed, the concentration of volatile organic matter is reduced to 10mg/m3.The work of adsorption saturation Property charcoal adsorption box be desorbed through the high-temperature gas that a small amount of temperature is 120 DEG C, desorption rate reaches 98%.The gas being desorbed, which contains, to be waved The concentration of hair property organic matter is 4000mg/m3, handled by catalytic combustion system 3-3,99.5% or more volatile organic matter Carbon dioxide and water are decomposed by catalysis oxidation, the heat of generation maintains the gas temperature for flowing out catalytic combustion system 3-3 150 DEG C, the desorption of activated carbon adsorption case can be met completely.
Active carbon in purification, organic matter removal unit 3 from the spraying exhaust gas being discharged in spray room 1-1 through paint removal slag unit 2 After adsorption box absorption, temperature, humidity and cleanliness are all satisfied the requirement of spray room 1-1 air feed, are recycled in spray room 1-1 for spraying Painting process.
Compared with the technical solution of the prior art, spraying waste gas purification concentration cycles system of the invention can be completely removed The paint slag in exhaust gas is sprayed, the removal rate of volatile organic matter reaches 95%, and the temperature of purified exhaust gas, humidity and cleanliness are equal Meet spray room air feed requirement, the energy consumption 902kWh of air feed heating can be saved.Since the powder in spraying exhaust gas can be completely removed The impurity such as dirt particle, processing equipment are not easy to plug, and the service life of equipment can increase by 60%.Realize the shower water of paint removal slag It is recycled, shower water consumption is made to reduce 98%.The heat that volatile organic compounds by catalytic combustion generates is for adsorption box Desorption can save desorption energy consumption 162.5kWh.In entire spraying waste gas treatment process, there is no exhaust gas outlet substantially, avoid spray Apply pollution of the pollutant to environment in exhaust gas.
Embodiment 6
Spraying exhaust gas is handled using spraying waste gas purification concentration cycles system as shown in Figure 3, dry filter dress Set installation micron order demister, G4 filter cotton, F6 filter bag, F8 filter bag, the first adsorption box 3-1 and the second adsorption box in 2-2 In adsorbent be active carbon, catalytic combustion system 3-3 inlet and outlet be provided with fire arrester 3-3-3.
Flow into the spraying exhaust gas of wet type paint removal slag tower 2-1 is about 80000m3/ h, paint slag concentration is about 350mg/m3, Volatile organic matter concentration is about 220mg/m3.The flow of spray-water is 140m3/ h, the addition speed of A, B reagent in slag making pond For 4.5Lm-3h-1.Exhaust gas is sprayed after wet type paint removal slag tower 2-1, therein 98% paint slag is removed, paint slag therein is dense Degree becomes 7mg/m3, after dry filter device 2-2, wherein the removal rate of paint slag and vapor reaches 100%.
Enter organic matter removal unit 3 through the purified spraying exhaust gas of paint removal slag unit 2, spraying exhaust gas is inhaled through active carbon It is attached, wherein 96% volatile organic matter is removed, the concentration of volatile organic matter is reduced to 8.8mg/m3.The work of adsorption saturation Property charcoal adsorption box be desorbed through the high-temperature gas that a small amount of temperature is 110 DEG C, desorption rate reaches 98%.The gas being desorbed, which contains, to be waved The concentration of hair property organic matter is 4400mg/m3, handled by catalytic combustion system 3-3,99.5% or more volatile organic matter Carbon dioxide and water are decomposed by catalysis oxidation, the heat of generation maintains the gas temperature for flowing out catalytic combustion system 3-3 144 DEG C, the desorption of activated carbon adsorption case can be met completely.
Active carbon in purification, organic matter removal unit 3 from the spraying exhaust gas being discharged in spray room 1-1 through paint removal slag unit 2 After adsorption box absorption, temperature, humidity and cleanliness are all satisfied the requirement of spray room 1-1 air feed, are recycled in spray room 1-1 for spraying Painting process.
Compared with the technical solution of the prior art, spraying waste gas purification concentration cycles system of the invention can be completely removed The paint slag in exhaust gas is sprayed, the removal rate of volatile organic matter reaches 96%, and the temperature of purified exhaust gas, humidity and cleanliness are equal Meet spray room air feed requirement, the energy consumption 722kWh of air feed heating can be saved.Since the powder in spraying exhaust gas can be completely removed The impurity such as dirt particle, processing equipment are not easy to plug, and the service life of equipment can increase by 60%.Realize the shower water of paint removal slag It is recycled, makes to spray water consumption reduction 98%.The heat that volatile organic compounds by catalytic combustion generates is used for the desorption of adsorption box, Desorption energy consumption 130kWh can be saved.In entire spraying waste gas treatment process, substantially without exhaust gas outlet, avoid dirty in spraying exhaust gas Contaminate pollution of the object to environment.

Claims (10)

1. a kind of purification concentration cycles method for spraying exhaust gas, comprising the following steps:
A, spray: exhaust gas will be sprayed and be passed through the lower part of spray equipment, spray liquid enters from spray equipment top, to spraying exhaust gas into Row countercurrent washing, the coating cloud sprayed in exhaust gas are intercepted by spray liquid, obtain the spraying exhaust gas of paint removal slag, carry the spray of paint slag Liquid stream goes out spray equipment;
B, paint removal slag: the spray liquid of the carrying paint slag of step a outflow spray equipment being collected into storage pool, A, B reagent is added, Make to paint slag coagulation, the paint slag of coagulation be pulled out, the spray liquid after being purified, circulation is used for the spray of step a;
C, demisting: by the spraying exhaust gas for removing paint removal slag of step a by demister, removing steam therein, obtains removal steam Spraying exhaust gas;
D, it filters: the spraying exhaust gas of the removal steam of step c being passed sequentially through into micron order demister, filter cotton, filter bag, into one Step removes steam, paint slag and dust particles therein, obtains the exhaust gas containing volatile organic matter;
E, it adsorbs: the exhaust gas containing volatile organic matter of step d being passed through adsorbent equipment, volatile organic matter therein is adsorbed Removal, the gas after being purified, purified gas recycle, and can be used as spraying process gas;
F, it is desorbed: the adsorbent equipment that hot gas is passed through the adsorption saturation of step e being carried out to the desorption of volatile organic matter, is obtained highly concentrated Organic exhaust gas is spent, the adsorbent equipment after desorption is used for the absorption of step e;
G, the obtained high-concentration organic waste gas of step f catalysis burning: is passed through catalytic combustion system, volatile organic matter therein It is oxidized decomposition, and generates heat, obtains hot gas, can be used for the desorption of step f.
2. a kind of purification concentration cycles method for spraying exhaust gas according to claim 1, which is characterized in that the step a's The volume flow ratio that spraying exhaust gas and spray liquid enter spray equipment is 300~800:1.
3. a kind of purification concentration cycles method for spraying exhaust gas according to claim 1, which is characterized in that the step b's A, the adding manner of B reagent includes that stream adds, flow acceleration 2.0Lm-3h-1~10.0Lm-3h-1
4. a kind of purification concentration cycles method for spraying exhaust gas according to claim 1, which is characterized in that the step e inhales Attached operation temperature is 0 DEG C~40 DEG C.
5. a kind of purification concentration cycles method for spraying exhaust gas according to claim 1, which is characterized in that the step f's The temperature that hot gas used is desorbed is 90 DEG C~150 DEG C.
6. a kind of purification concentration cycles system for spraying exhaust gas, which is characterized in that including spray unit (1), paint removal slag unit (2) With organic matter removal unit (3);
The spray unit (1) includes spray room (1-1);
The paint removal slag unit (2) includes wet type paint removal slag tower (2-1), dry filter device (2-2), cyclic water tank (2-3), follows Ring water pump (2-4) and slag making pond (2-5);
The organic matter removal unit (3) includes the first adsorption box (3-1), the second adsorption box (3-2), catalytic combustion system (3- 3) blower (3-4) and valve, is desorbed;
The water outlet (2-3-1) of the cyclic water tank (2-3) of the paint removal slag unit (2) and the spray of wet type paint removal slag tower (2-1) Water inlet (2-1-3) connection, is arranged an at least water circulating pump (2- between cyclic water tank (2-3) and wet type paint removal slag tower (2-1) 4), the waste liquid outlet (2-1-4) of wet type paint removal slag tower (2-1) is connect with the water inlet of slag making pond (2-5), slag making pond (2-5's) Water outlet is connect with the water inlet (2-3-2) of cyclic water tank (2-3), and fresh water inlet (2- is additionally provided on cyclic water tank (2-3) 3-3), the exhaust gas inlet (2-2-1) of the waste gas outlet (2-1-2) of wet type paint removal slag tower (2-1) and dry filter device (2-2) connect It connects;
The first adsorption box (3-1) of the organic matter removal unit (3) is provided with exhaust gas inlet (3-1-1), waste gas outlet (3-1- 2), desorption gas import (3-1-3) and desorption gas export (3-1-4), the second adsorption box (3-2) be provided with exhaust gas inlet (3-2-1), Waste gas outlet (3-2-2), desorption gas import (3-2-3) and desorption gas export (3-2-4), the exhaust gas of the first adsorption box (3-1) into Mouth (3-1-1), waste gas outlet (3-1-2), desorption gas import (3-1-3), desorption gas outlet (3-2-4) and the second adsorption box (3- 2) exhaust gas inlet (3-2-1), waste gas outlet (3-2-2), desorption gas import (3-2-3) and desorption gas outlet (3-2-4) is all provided with It is equipped with valve, the air inlet behind desorption gas outlet (3-1-4) and desorption gas outlet (3-2-4) parallel connection with catalytic combustion system (3-3) The gas outlet (3-3-2) of mouth (3-3-1) connection, catalytic combustion system (3-3) is connect with the air inlet of desorption blower (3-4), is taken off It is connect after attached gas import (3-1-3) and desorption gas import (3-2-3) are in parallel with the air outlet of desorption blower (3-4);
The gas outlet of the spray room (1-1) is connect with the exhaust gas inlet (2-1-1) of wet type paint removal slag tower (2-1), the first adsorption box After (3-1) exhaust gas inlet (3-1-1) and the second adsorption box (3-2) exhaust gas inlet (3-2-1) are in parallel with dry filter (2-2) Waste gas outlet (2-2-2) connection, the first adsorption box (3-1) waste gas outlet (3-1-2) and the second adsorption box (3-2) waste gas outlet It is connect after (3-2-2) is in parallel with the air inlet of spray room (1-1).
7. a kind of purification concentration cycles system for spraying exhaust gas according to claim 6, which is characterized in that the wet type paint removal Three layers of spray equipment (2-1-5) are provided in slag tower (2-1), are located at the top of exhaust gas inlet (2-1-1), in spray equipment (2- Demister (2-1-6) is arranged in top 1-5), and the quantity of water circulating pump (2-4) setting is 3, fills respectively with three layers of spray Set the water inlet connection of (2-1-5).
8. a kind of purification concentration cycles system for spraying exhaust gas according to claim 6, which is characterized in that the dry filter Demister (2-2-3), filter cotton (2-2-4), filter bag (2-2-5) are set gradually in device (2-2).
9. a kind of purification concentration cycles system for spraying exhaust gas according to claim 8, which is characterized in that the demister (2-2-3) includes micron order demister, and the filter cotton (2-2-4) includes G4 filter cotton, and the filter bag (2-2-5) includes F6 Filter bag, F8 filter bag.
10. a kind of purification concentration cycles system for spraying exhaust gas according to claim 6, which is characterized in that described first inhales Attached case (3-1) and the second adsorption box (3-2) are provided with adsorbent, and the adsorbent includes active carbon, molecular sieve, zeolite.
CN201811637005.XA 2018-12-29 2018-12-29 Spray the purification concentration cycles method and system of exhaust gas Pending CN109432944A (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111389161A (en) * 2020-04-20 2020-07-10 上海红重机械装备有限公司 Steel structure coating waste gas treatment process
CN113694667A (en) * 2021-08-18 2021-11-26 山东泰开环保科技有限公司 Paint spray booth waste gas zero discharge treatment system and technological process
CN113842734A (en) * 2021-11-01 2021-12-28 杭州三星工艺玻璃有限公司 Glass bottle production is with exhaust treatment device that sprays paint

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111389161A (en) * 2020-04-20 2020-07-10 上海红重机械装备有限公司 Steel structure coating waste gas treatment process
CN113694667A (en) * 2021-08-18 2021-11-26 山东泰开环保科技有限公司 Paint spray booth waste gas zero discharge treatment system and technological process
CN113842734A (en) * 2021-11-01 2021-12-28 杭州三星工艺玻璃有限公司 Glass bottle production is with exhaust treatment device that sprays paint

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