CN102389684B - Recycling device for exhaust gas of painted organic solvent and method for recycling organic solvent - Google Patents

Recycling device for exhaust gas of painted organic solvent and method for recycling organic solvent Download PDF

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Publication number
CN102389684B
CN102389684B CN201110311140.7A CN201110311140A CN102389684B CN 102389684 B CN102389684 B CN 102389684B CN 201110311140 A CN201110311140 A CN 201110311140A CN 102389684 B CN102389684 B CN 102389684B
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China
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organic solvent
exhaust gas
waste gas
adsorption tanks
solvent waste
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CN201110311140.7A
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CN102389684A (en
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傅志森
傅太平
唐源欣
傅金栋
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Zhongke Tianlong Xiamen Environmental Protection Co ltd
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Zhongke Tongchuang (xiamen) Environmental Technology Co Ltd
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Abstract

The invention discloses a recycling device for an exhaust gas of a painted organic solvent. The recycling device comprises a painting fog removing device, a fan, an absorbing jar, a condenser and an oil-water separator which are connected in turn, wherein the painting fog removing device comprises a gas collecting tank, a cyclone dust collector and a bag type dust collector; the gas collecting tank is used for temporarily storing the exhaust gas of the organic solvent; and the gas collecting tank, the cyclone dust collector and the bag type dust collector are connected in turn. All components of the recycling device are reasonably and compactly jointed; collection efficiency is high; and the painting fog is efficiently removed while a trouble in frequently exchanging filter cotton is avoided. The invention also discloses a method for utilizing the recycling device for the exhaust gas of the painted organic solvent to recycle the organic solvent. The method comprises the following steps: removing the painting fog; absorbing; desorbing steam; condensing; and separating oil from water, wherein the step of removing the painting fog is carried out by changing the painting fog into painting powder and then efficiently removing the painting fog. Compared with a traditional process, the method is more reasonable, compact and labor-saving.

Description

Organic solvent waste gas recovering device and organic solvent recovery method spray paint
Technical field
Organic solvent waste gas recovery technology field, the device that the organic solvent waste gas that specifically sprays paint reclaims and the method for utilizing this device recovery organic solvent the present invention relates to spray paint.
Background technology
Lacquer spraying technique is widely used in industries such as machinery, electrical equipment, household electrical appliances, automobile, boats and ships, furniture.Raw material sprays paint---and coating is made up of non-volatile part and fugitive constituent, non-volatile part comprises film forming matter and auxiliary film forming matter, fugitive constituent refers to curing agent and diluent, diluent is a kind of in order to reduce resin viscosity, improve its processing performance and add with resin compatibility better fluid material, add curing agent and be and promote paint rapid draing, increase adhesiveness and lacquer painting intensity, improve the chemical stability of paint.Lacquer spraying waste gas is mainly formed by volatile curing agent, diluent molecule and nonvolatile coating cloud molecular mixing.Because small, the viscosity of coating cloud particle is big, easy coherent substance surface, purify and must remove coating cloud before reclaiming organic exhaust gas, traditional coating cloud removal method generally is divided into dry method, wet method dual mode.
What dry method adopted is the filtration, purification mode, and the paint spray booth forms negative pressure under the effect of coating cloud cleaning system induced draft blower withdraws, and coating cloud is under suction function, be introduced into the coating cloud filter, by filtering filtering materials such as silk floss, filter plate, filter paper, filter liquid lacquer and drip, reach the purpose of removing coating cloud.But also there are some shortcomings, 1, because coating cloud viscosity is big, easily stick to the filter cotton surface, along with filter cotton contains the increase of lacquer amount, exhaust resistance increases sharply, and therefore must select high-head air draft blower fan, and electrical power is multiplied, and operating cost improves greatly; 2, the filter cotton use of can't regenerating after inhaling full coating cloud can only be changed, and the filter cotton use amount is very big, and operating cost is surprising; 3, inhaling the filter cotton of the coating cloud of having satisfied can only landfill or burning disposal, forms secondary pollution, increases the expense of post processing; 4, filter efficiency is low, does not filter completely that the coating cloud granule easily stops up the active carbon hole, and active carbon lost efficacy easily; 5, the adsorption tanks utilization rate is not high, and the organic solvent rate of recovery is low.In addition, traditional handicraft is generally used the method for single jar of desorption of single jar of absorption, and the organic solvent rate of recovery is not high, another kind is just to have used the absorption of directly connecting of two adsorption tanks when just having adsorbed, need many increases equipment to drop into, utilization rate of equipment and installations is not high, increases the equipment investment expense yet.
It is treatment facility that wet method adopts the cascade paint spray booth, and the equipment front is the water curtain plate, is overflow launder above the water curtain plate, and water curtain plate back is multistage cascade filter.When spraying paint, the coating cloud that enters the paint spray booth at first meets with water curtain, is washed in the water tank.All the other coating clouds are intercepted in the water by multistage cascade filter the time.Water in the water tank is overflowed on the water curtain plate and is formed water curtain by the spilling water groove of water pump lifting to water curtain and multistage cascade filter top.But also there are many shortcomings in this method, 1, along with the various places lack of water is serious day by day, water price goes up and the use problem of restricting water supply causes that its operating cost is higher 2, environmental regulation perfect, the sewage of discharging is also wanted purified treatment, also be a considerable operating cost, 3, water-washing process is actual is process to the waste gas humidification, the humidity height, very big to the charcoal absorption influential effect, finally have influence on waste gas Recovery of Organic Solvent efficient.
Summary of the invention
The invention provides a kind of organic solvent waste gas recovering device, its purpose is to overcome that the demist efficient that prior art exists is low, the easy premature failure of active carbon and need often to change defective such as filter pulp.Another object of the present invention is to provide a kind of organic solvent recovery method, and its purpose is efficiently to remove coating cloud, and improves the utilization rate of adsorption tanks, thereby is beneficial to Recovery of Organic Solvent.
Technical scheme of the present invention is as follows:
The organic solvent waste gas recovering device sprays paint, comprise the coating cloud removal device, blower fan, adsorption tanks, condenser and the oil water separator that connect successively, described coating cloud removal device comprises air collector, cyclone dust collectors and the sack cleaner for temporary organic solvent waste gas, the entrance of described air collector is connected with the organic solvent flue gas leading of japanning room, the outlet of air collector is connected with the entrance of cyclone dust collectors, and the outlet of cyclone dust collectors is connected with the entrance of sack cleaner; The outlet of sack cleaner is connected with fans entrance.
The cavity that has a temporary organic solvent waste gas in the described air collector is equiped with deflection plate or eddy flow plate or at air collector top dress venturi filter paper in the described cavity.
Described blower fan is centrifugal high pressure fan; Be separated with gripper shoe between in the described adsorption tanks, this gripper shoe top is filled with fibrous activated carbon; This gripper shoe is under-filled corallite or renewable absorbent charcoal functional ceramic.
The described organic solvent waste gas recovering device that sprays paint comprises at least two adsorption tanks, all be connected with organic exhaust gas on each adsorption tanks and enter pipe and organic exhaust gas arm, each organic exhaust gas enters on pipe and the organic exhaust gas arm valve is installed, it is parallel with one another that described organic exhaust gas enters pipe, and it all is connected in the outlet of blower fan; Described organic exhaust gas arm is parallel with one another.
The described organic solvent waste gas recovering device that sprays paint also comprises an automatic control system, and each valve and oil water separator on described cyclone dust collectors, sack cleaner, blower fan, the adsorption tanks all are connected with automatic control system.
A kind of utilization organic solvent waste gas recovering device that sprays paint reclaims the method for organic solvent, it may further comprise the steps successively, remove coating cloud, absorption, water vapour desorption, condensation and water-oil separating, described removal coating cloud step comprises: organic solvent waste gas is temporary in makes it pre-air-dry and begin to take shape the lacquer powder in the air collector earlier, then enter in the cyclone dust collectors air-dry and form the lacquer powder again; The preliminary lacquer powder of removing enters at last again and removes the lacquer powder in the sack cleaner simultaneously.More reasonable with respect to former technology, the compact and saving labour of this method.
By the above-mentioned description of this invention as can be known, compare with prior art, the invention has the advantages that:
1, the organic solvent waste gas recovering device that sprays paint of the present invention, use air collector to carry out air-dry to coating cloud in advance earlier, then utilize the pre-dedusting of cyclone dust collectors and further air-dry coating cloud powdering particle, carry out high efficiency through sack cleaner again and remove lacquer powder after air-dry, each parts linking of retracting device is reasonable, compact, efficiency of dust collection is high, and has saved the trouble of frequent replacing filter pulp in efficient removal coating cloud.
2, the present invention fills the adsorption filtration of once coating with lacquer powder again when renewable corallite or renewable absorbent charcoal functional ceramic make organic exhaust gas enter charcoal absorption in the adsorption tanks bottom, prevent the sack cleaner dedusting thoroughly or reason such as broken bag make the active carbon hole be coated with lacquer powder to stop up, thereby prolonged service life and the adsorption efficiency of active carbon.
3, automatic control system is regulated the opening of each valve on the adsorption tanks, thereby the mutual series and parallel of corresponding adsorption tanks ground is adsorbed or desorption and regeneration.Utilize adsorption time long, the characteristics that the desorption and regeneration time is short can be carried out the absorption simultaneously of majority jar, and the minority jar carries out desorption and regeneration, and avoid or reduce the idle time of desorption and regeneration jar, thus the utilization rate of raising adsorption tanks.
4, automatic control system of the present invention can adopt the micro computer Automatic Control, and the man-machine interface operation can show the working condition with monitoring system in real time; According to different operating modes, system can design multiple tracks and control security alarm and chain protection automatically, makes whole flow operations simple, stable, safe and reliable.In addition, automatic control system can also be controlled the opening of each valve on the adsorption tanks, thereby regulates the annexation of each adsorption tanks, and adsorb without any confusion, reproduction operation.
Description of drawings
Fig. 1 is structural representation of the present invention.
The specific embodiment
The specific embodiment of the present invention is described with reference to the accompanying drawings.
With reference to Fig. 1, the organic solvent waste gas recovering device sprays paint, comprise successively the air collector 1 that connects, cyclone dust collectors 2, sack cleaner 3, centrifugal high pressure fan 4, two adsorption tanks 51,52, condenser 6 and oil water separator 7, it comprises that also a cover is used for the automatic control system (figure does not draw) of above-mentioned each parts of regulation and control.The entrance of air collector 1 is connected with the organic solvent flue gas leading of japanning room (not drawing among the figure), and the outlet of air collector 1 is connected with the entrance of cyclone dust collectors 2; The outlet of cyclone dust collectors 2 is connected with the entrance of sack cleaner 3; The outlet of sack cleaner 3 is connected with centrifugal high pressure fan 4 entrances; The outlet of centrifugal high pressure fan 4 is connected with adsorption tanks 51,52 entrance simultaneously; Adsorption tanks 51,52 outlet all are connected in condenser 6 entrances; The outlet of condenser 6 is connected with oil water separator 7.
The cavity that has a temporary organic solvent waste gas in the air collector 1, can adorn deflection plate or eddy flow plate in this cavity or (these are prior art at air collector top dress venturi filter paper, its internal structure of not drawing among the figure), to improve the air-dry speed of coating cloud.In addition, in order to obtain stronger absorption property, be filled with fibrous activated carbon in the adsorption tanks 51,52 usually; For preventing that above-mentioned paint removal powder from thoroughly not making the lacquer powder stop up life-span and the adsorption effect that the active carbon hole influences active carbon, fill reproducible corallite or renewable absorbent charcoal functional ceramic in adsorption tanks 51,52 bottoms, the adsorption filtration of once coating with lacquer powder again when the microporosity of utilizing these fillers to exist makes organic exhaust gas enter charcoal absorption.In addition, above-mentioned cyclone dust collectors 2, sack cleaner 3, centrifugal high pressure fan 4, condenser 6 and oil water separator 7 are all comparatively common in the prior art, do not repeat them here.
Be separated with gripper shoe (not drawing among the figure) between in the adsorption tanks 51,52, this gripper shoe top is filled with fibrous activated carbon; This gripper shoe is under-filled corallite or renewable absorbent charcoal functional ceramic.All be connected with organic exhaust gas on the adsorption tanks 51,52 and enter pipe 511,521 and organic exhaust gas arm 512,522, organic exhaust gas enters on pipe 511,521 and the organic exhaust gas arm 512,522 valve 53 all is installed, it is parallel with one another that organic exhaust gas enters pipe 511,521, and it all is connected in the outlet of centrifugal high pressure fan 4; Organic exhaust gas arm 512,522 parallel with one another.During use, automatic control system is controlled to be shaped on the valve 53 that machine waste gas enters pipe 511,521 and to open, at this moment, adsorption tanks 51,52 parallel connections, organic exhaust gas enters adsorption tanks 51,52 absorption simultaneously; Automatic control system also can only enter organic exhaust gas the valve 53 that pipe 511 or organic exhaust gas enter pipe 521 and open, at this moment, adsorption tanks 51,52 series connection, organic exhaust gas successively enters adsorption tanks 51 or adsorption tanks 52 absorption.
Continuation is with reference to Fig. 1, a kind of method of utilizing the above-mentioned organic solvent waste gas recovering device recovery organic solvent that sprays paint, the organic exhaust gas that contains coating cloud that painting line comes out connects air collector 1 through the organic solvent flue gas leading, because the cushioning effect in the cavity of air collector 1, the organic exhaust gas that contains coating cloud is done short stay at air collector 1, it is air-dry that coating cloud obtains the short time, reduces the short grained viscosity of coating cloud; The centrifugal force that air-dry exhaust organic gas containing paint mist of short time utilizes cyclone dust collectors 2 dust-contained airflows to rotate and produce by cyclone dust collectors 2, with coating cloud granule separation and collection from gas, remove the part initial stage at the air-dry lacquer powder of air collector 1, outside cyclone dust collectors 2, under the interior whirlwind effect, the further air-dry lacquering powder of molecule in the not air-dry fully coating cloud also; The organic exhaust gas of initial stage except coating cloud enters sack cleaner 3, and the distinctive feature of utilizing 3 pairs of fine particles of sack cleaner to handle is carried out high efficiency dedusting, and the deashing device (Fig. 1 does not show) of lacquer pruinescence bag-type dust equipment is handled; The organic solvent waste gas dust content that is come out by sack cleaner 3 is very low, this part organic solvent waste gas is sent into adsorption tanks 51 by centrifugal high pressure fan 4, organic solvent waste gas further adsorbs, filters out residue lacquer powder through reproducible corallite or the renewable absorbent charcoal functional ceramic of adsorption tanks 51 bottoms earlier, enter activated carbon adsorption layer then, utilize active carbon that the adsorption capacity of organic solvent gas is adsorbed, the Purge gas organic solvent content that adsorbed reaches the discharge standard requirement, directly discharges in the atmosphere by adsorption tanks 51 exhaust outlets; Active carbon through being adsorbed with the machine solvent after a while switches to the desorption and regeneration state near saturation state by automatic control system, and desorption and regeneration is medium with the water vapour, is undertaken by feeding the water vapour form to adsorption tanks 51; Organic vapor behind the desorption and water vapour enter condenser 7 and are cooled to liquid state, send into oil water separator 8 at last and utilize organic solvent and the difference of specific gravity of water to carry out separating of organic solvent and water.When adsorption tanks 51 initial adsorption, active carbon only is in load organic solvent a little, adopt single jar of absorption can reach emission request, the adsorption tanks 52 of this moment carry out the water vapour desorption, when adsorption tanks 51 during near leakage point, adsorption tanks 52 active carbons have been regenerated and have been finished, and adsorption tanks 51 at this moment can be connected in series to adsorption tanks 52, so can not accept superfluous organic solvent because adsorption tanks 52 have load, adsorption tanks 51 are more near saturation state.Two adsorption tanks 51,52 absorption, desorptions hocket, and so move in circles, and guarantee the continuous recovery of organic solvent waste gas.In adsorption tanks 51 desorptions, adsorption tanks 52 begin to adsorb, and upon adsorption jars 52 when carrying out desorption, adsorption tanks 51 adsorb again, so move in circles, and have guaranteed the continuous recovery of organic solvent waste gas, have improved adsorption tanks 51,52 utilization rate of equipment and installations.
In addition, above-mentioned sack cleaner 3 adopts the off-line ash-clearing Low-Pressure Pulse Bag Filter usually, and this sack cleaner 3 has the following advantages: a) drag losses is little.Dusty gas enters each filter chamber, unit also by the flue gas guiding device in the ash bucket by mozzle, since in the design bag end from air inlet vertical range suitable for reading have enough, rational headroom, air-flow, reaches whole filtration indoor air flow and is evenly distributed to distribution by suitable water conservancy diversion and spontaneous current; Granule dust in the dusty gas directly falls into ash bucket, all the other dust under the guiding of flow guide system by the natural subsidence separation, and casing filtering area in entering with air-flow is adsorbed on the filter bag outer surface.Clean gas after the filtration sees through filter bag and discharges through upper box, exhaust duct; B) unique design of deduster off-line valve makes this sack cleaner 3 have off-line ash-clearing function and on-line maintenance function; C) waterproof and oilproof PO PE NT PTFE material, purification style are outside filtering type; D) use the long service-life diaphragm electromagnetic impulse valve to carry out the low pressure jetting deashing, the deashing ability improves; E) at the deduster handling characteristics, multinomial online detection, watch-dogs such as the detection of deduster operating pressure, material level detection, operational outfit fault detect are set.Certain sack cleaner of the present invention 3 also can be selected other equipment that has same dust removal performance and meet economy beyond the example for use.The off-line ash-clearing Low-Pressure Pulse Bag Filter is prior art, does not repeat them here.
Above-mentioned condenser 7 cooling mediums adopt the water-cooled form, and the hot water that condenser 7 comes out is sent into condenser 7 after sending cooling tower (not drawing among Fig. 1) cooling again, forms hydronic effect.
Above-mentioned only is the specific embodiment of the present invention, but design concept of the present invention is not limited thereto, and allly utilizes this design that the present invention is carried out the change of unsubstantiality, all should belong to the behavior of invading protection domain of the present invention.

Claims (6)

1. the organic solvent waste gas recovering device sprays paint, comprise the coating cloud removal device, blower fan, adsorption tanks, condenser and the oil water separator that connect successively, it is characterized in that: described coating cloud removal device comprises air collector, cyclone dust collectors and the sack cleaner for temporary organic solvent waste gas, the entrance of described air collector is connected with the organic solvent flue gas leading of japanning room, the outlet of air collector is connected with the entrance of cyclone dust collectors, and the outlet of cyclone dust collectors is connected with the entrance of sack cleaner; The outlet of sack cleaner is connected with fans entrance; Be separated with gripper shoe between in the described adsorption tanks, this gripper shoe top is filled with fibrous activated carbon; This gripper shoe is under-filled corallite or renewable absorbent charcoal functional ceramic.
2. the organic solvent waste gas recovering device that sprays paint as claimed in claim 1 is characterized in that: have the cavity of a temporary organic solvent waste gas in the described air collector, be equiped with deflection plate or eddy flow plate in the described cavity or at air collector top dress venturi filter paper.
3. the organic solvent waste gas recovering device that sprays paint as claimed in claim 1, it is characterized in that: described blower fan is centrifugal high pressure fan.
4. the organic solvent waste gas recovering device that sprays paint as claimed in claim 1, it is characterized in that: the described organic solvent waste gas recovering device that sprays paint comprises at least two adsorption tanks, all be connected with organic exhaust gas on each adsorption tanks and enter pipe and organic exhaust gas arm, each organic exhaust gas enters on pipe and the organic exhaust gas arm valve is installed, it is parallel with one another that described organic exhaust gas enters pipe, and it all is connected in the outlet of blower fan; Described organic exhaust gas arm is parallel with one another.
5. the organic solvent waste gas recovering device that sprays paint as claimed in claim 4, it is characterized in that: the described organic solvent waste gas recovering device that sprays paint also comprises an automatic control system, and each valve and oil water separator on described cyclone dust collectors, sack cleaner, blower fan, the adsorption tanks all are connected with automatic control system.
6. method of utilizing the described device of claim 1 to reclaim organic solvent, it may further comprise the steps successively, remove coating cloud, absorption, water vapour desorption, condensation and water-oil separating, it is characterized in that, described removal coating cloud step comprises: organic solvent waste gas is temporary in makes it pre-air-dry and begin to take shape the lacquer powder in the air collector earlier, then enter in the cyclone dust collectors air-dry and form the lacquer powder again; The preliminary lacquer powder of removing enters at last again and removes the lacquer powder in the sack cleaner simultaneously.
CN201110311140.7A 2011-10-14 2011-10-14 Recycling device for exhaust gas of painted organic solvent and method for recycling organic solvent Expired - Fee Related CN102389684B (en)

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CN102614731B (en) * 2012-04-05 2014-03-26 泉州市天龙环境工程有限公司 Purifying device for paint spraying organic waste gas and solvent recovering method thereof
CN102814103B (en) * 2012-08-27 2013-12-18 浙江大学 Four-stage sludge drying tail gas treatment system
CN103446841B (en) * 2013-09-27 2016-03-09 天津赛智科技发展有限公司 Be exclusively used in the spray filter of purifying industrial volatile organic pollutants
CN104923051B (en) * 2015-05-11 2017-06-13 苏州瑞钰特自动化科技有限公司 A kind of coating waste gas, waste water, waste residue one cleaning system
CN105107232B (en) * 2015-09-17 2017-03-29 湖州新奥特医药化工有限公司 A kind of pre- cold mould refrigerated separation structure
CN107120666A (en) * 2017-04-24 2017-09-01 航天凯天环保科技股份有限公司 One kind spraying exhaust gas purifying method and device
CN108926966A (en) * 2018-07-19 2018-12-04 李田英 A kind of exhaust gas combined treatment equipment and its treatment process containing coating cloud and VOCs
CN109200728A (en) * 2018-11-02 2019-01-15 青岛理工大学 A kind of lacquer spraying waste gas processing unit

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