CN100553740C - Method for organic waste gas recovery - Google Patents
Method for organic waste gas recovery Download PDFInfo
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- CN100553740C CN100553740C CNB2006100371295A CN200610037129A CN100553740C CN 100553740 C CN100553740 C CN 100553740C CN B2006100371295 A CNB2006100371295 A CN B2006100371295A CN 200610037129 A CN200610037129 A CN 200610037129A CN 100553740 C CN100553740 C CN 100553740C
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Abstract
The present invention discloses a kind of method for organic waste gas recovery, organic exhaust gas carries out preliminary treatment by filter and cooler earlier, is adsorbed by adsorption tanks again, adsorbs saturated back water vapour desorption, the mixing gas that desorption comes out after condenser condenses, enters oil water separator and isolates solvent and waste water again; Between adsorption tanks and condenser, increase a dividing wall type heat exchange waste water heater; Send into the waste water heater by the waste water that oil water separator comes out, the water vapour waste heat that utilizes the adsorption tanks desorption to come out heats by the dividing wall type heat exchange, the residual solvent in the evaporation waste water; The solvent that is evaporated recycles again, evaporate remaining waste water enter another active carbon adsorber or waste water processing station to the trace solvent adsorption treatment in the waste water to back up to standard discharging.The present invention makes full use of the water vapour waste heat heated waste water that the adsorption tanks desorption comes out, and reduces the organic solvent content of waste water, improves organic efficiency, reduces waste water processing cost again, reduces secondary pollution.
Description
Technical field
The invention belongs to a kind of industrial organic exhaust gas recovery method, relate to a kind of treatment technology that adopts charcoal absorption organic exhaust gas and desorption to reclaim improvement and desorption waste water.This recovery method can be used to recycle benzene,toluene,xylene, ethyl acetate, ethyl acetate, acetone, butanone, styrene, trichloro-ethylene, dichloroethylene, n-hexane, cyclohexane, gasoline ... etc. multiple organic solvent waste gas, the organic exhaust gas of original atmosphere pollution reclaimed make it to become liquid and reused.
Technical background
Use a large amount of organic solvents in the industrial processes such as rubber, chemical industry, electronics, adhesive tape, printing and dyeing, process hides, gluing, printing, these solvents are to discharge with the waste gas form.Domestic processing organic exhaust gas method has at present: burning disposal, concentrated catalytic combustion, methods such as absorption recovery, biological treatment and low-temperature plasma.Burning disposal only is suitable for little air quantity high-concentration organic waste gas to be handled, the operating cost height, and solvent can not reclaim, and resource can not reuse.The technology of biology and plasma treatment is also among inquiring into.And advantage such as have that operating cost is low, treatment effect good, the solvent after reclaiming is reusable is reclaimed in absorption, has both reached the cleaner production purpose, reaches resource circulation utilization again, meets the requirement of sustainable development.
At present, the flow chart of the recovery technology of domestic organic exhaust gas as shown in Figure 1, after the waste gas of production line carries out preliminary treatment and removes harmful substances to active carbon such as dust in the waste gas through filter 1 and cooler 2, after cooling off and going dust to handle, enter adsorption tanks 4 by air-introduced machine 3, organic exhaust gas is purified by charcoal absorption, clean air after the purification directly discharges, the mixing gas of organic solvent that desorption comes out and water vapour enters separator after condenser 5 is condensed to normal temperature, according to solvent properties, water-soluble solvent is adopted rectifying, methods such as extraction are separated, to water-insoluble solvent, enter oil water separator 6 and separate, the solvent of separating can further be handled or directly be recycled in the solvent tank 7, and the waste water of separating then directly discharges or enters the waste water processing station and further handle.
The problem that this recovery method exists is: still contain certain amount of organic solvent in the desorption waste water, at the organic solvent below 95 ℃, these organic solvents reduce organic efficiency with discharge of wastewater such as boiling point or azeotropic point, and waste water is the processing cost height again, causes secondary pollution easily.
Summary of the invention
The present invention aims to provide a kind of method for organic waste gas recovery, to reduce the organic solvent content of waste water, improves organic efficiency, reduces waste water processing cost again, reduces secondary pollution.
For reaching above-mentioned purpose, technical scheme of the present invention is:
Method for organic waste gas recovery, organic exhaust gas carries out preliminary treatment by filter and cooler earlier, is adsorbed by adsorption tanks again, adsorbs saturated back water vapour desorption, the mixing gas that desorption comes out after condenser condenses, enters oil water separator and isolates solvent and waste water again; Wherein, between adsorption tanks and condenser, increase a dividing wall type heat exchange waste water heater; Send into the waste water heater by the waste water that oil water separator comes out, the water vapour waste heat that utilizes the adsorption tanks desorption to come out heats by the partition heat exchange, the residual solvent in the evaporation waste water; The solvent that is evaporated recycles again, evaporate remaining waste water enter another active carbon adsorber or waste water processing station to the trace solvent adsorption treatment in the waste water to back up to standard discharging.
The described waste water that is come out by oil water separator enters in the evaporimeter residual solvent in the further evaporation waste water again behind the waste water heater.
The described solvent that is evaporated is undertaken entering oil water separator once more after the condensation by another condenser.
The described solvent that is evaporated is got back to adsorption tanks adsorption treatment again after adopting the high pressure positive blower of recovery system to be drawn into aforementioned filter, cooler.
After adopting said method, the present invention is under the situation that does not increase energy consumption, make full use of the water vapour waste heat that the adsorption tanks desorption comes out the waste water that oil water separator comes out is carried out the partition heat exchanger heats, the organic solvent that will be dissolved in waste water further reclaims, boiling point or azeotropic point both can have been improved in the Recovery of Organic Solvent efficient below 95 ℃, again the solvent of waste water is dropped to discharge or handle a little and get final product qualified discharge, make waste water accomplish the cleaning discharging, reduce waste water processing cost again, reduced secondary pollution.
Description of drawings
Fig. 1 is the flow chart of method for organic waste gas recovery in the prior art;
Fig. 2 is the flow chart of the embodiment of the invention one;
Fig. 3 is the flow chart of the embodiment of the invention two;
Fig. 4 is the flow chart of the embodiment of the invention three;
Fig. 5 is the flow chart of the embodiment of the invention four.
The specific embodiment
As shown in Figure 2, be the embodiment one of the method for organic waste gas recovery that discloses of the present invention, organic exhaust gas carries out preliminary treatment by filter 1 and cooler 2 (or again through a filter 1) earlier, entering adsorption tanks 4 via air-introduced machine 3 again adsorbs, adsorbing saturated back carries out desorption and regeneration with water vapour and must mix gas, the mixing gas that desorption comes out after condenser 5 condensations, enters oil water separator 6 and isolates solvent and waste water again.Improvement of the present invention is to increase a dividing wall type heat exchange waste water heater 8 after adsorption tanks 4, before the condenser 5; The waste water that is come out by oil water separator 6 is by being pumped into waste water heater 8, the water vapour waste heat that utilizes adsorption tanks 4 desorptions to come out, heat by the partition heat exchange, after being heated to the boiling point of this organic solvent or the above 2-10 of azeotropic point ℃, organic solvent fully is evaporated, residual solvent in the evaporation waste water, organic solvent content in the waste water is further reduced, such as reducing boiling point or azeotropic point at the organic solvent content below 95 ℃, residual solvent in the waste water fully is evaporated, the solvent that is evaporated recycles again, and the organic solvent organic efficiency that is dissolved in waste water is improved; Evaporate remaining waste water enter another active carbon adsorber or waste water processing station to the trace solvent adsorption treatment in the waste water to back up to standard discharging, reduced secondary pollution.
Not thorough for fear of the waste water evaporation of coming out by oil water separator 6, present embodiment one also increases an evaporimeter 9 that filler is housed after waste water heater 8, improve evaporation rate and evaporation effect by improving the vapour-liquid exchange area, further evaporate the residual solvent in the waste water.
In addition, the concrete grammar of " solvent that is evaporated recycles again " has a lot, is shown with three kinds of methods as Fig. 3,4,5.Shown in Figure 3 is after the solvent that will be evaporated carries out condensation by another condenser 10, to enter aforementioned oil water separator 6 once more and separate.Shown in Figure 4 be will be evaporated solvent get back to adsorption tanks 4 adsorption treatment again after adopting the high pressure positive blower of recovery system to be drawn into aforementioned filter 1, cooler 2.Shown in Figure 5 is the comprehensive of Fig. 3 and 4, the solvent gas that is evaporated is looked the size of tolerance, the high pressure positive blower of the employing recovery system of little tolerance is drawn into to be got back to adsorption tanks 4 behind aforementioned filter 1, the cooler 2 and adsorbs again, and another condenser 10 of the employing of atm number enters oil water separator 6 after with its condensation.Identical as for miscellaneous equipment label among Fig. 3-5 with Fig. 2, so do not give unnecessary details.
Claims (3)
1, method for organic waste gas recovery, organic exhaust gas carries out preliminary treatment by filter and cooler earlier, is adsorbed by adsorption tanks again, adsorbs saturated back water vapour desorption, the mixing gas that desorption comes out after condenser condenses, enters oil water separator and isolates solvent and waste water again; It is characterized in that: between adsorption tanks and condenser, increase a dividing wall type heat exchange waste water heater; Send into the waste water heater by the waste water that oil water separator comes out, utilize water vapour waste heat that the adsorption tanks desorption comes out to be heated to the boiling point of organic solvent or the above 2-10 of azeotropic point ℃ by the dividing wall type heat exchange, residual solvent in the evaporation waste water enters the residual solvent that further evaporates in the evaporimeter that filler is housed in the waste water again; The solvent that is evaporated recycles again, evaporate remaining waste water enter another active carbon adsorber or waste water processing station to the trace solvent adsorption treatment in the waste water to back up to standard discharging.
2, method for organic waste gas recovery as claimed in claim 1 is characterized in that: the solvent that is evaporated is undertaken entering oil water separator once more after the condensation by another condenser.
3, method for organic waste gas recovery as claimed in claim 1 is characterized in that: the solvent that is evaporated is got back to adsorption tanks adsorption treatment again after adopting the high pressure positive blower of recovery system to be drawn into aforementioned filter, cooler.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2006100371295A CN100553740C (en) | 2006-08-17 | 2006-08-17 | Method for organic waste gas recovery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2006100371295A CN100553740C (en) | 2006-08-17 | 2006-08-17 | Method for organic waste gas recovery |
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| Publication Number | Publication Date |
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| CN101125274A CN101125274A (en) | 2008-02-20 |
| CN100553740C true CN100553740C (en) | 2009-10-28 |
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| Application Number | Title | Priority Date | Filing Date |
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| CNB2006100371295A Expired - Fee Related CN100553740C (en) | 2006-08-17 | 2006-08-17 | Method for organic waste gas recovery |
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| CN104436988A (en) * | 2013-09-13 | 2015-03-25 | 中国科学院兰州化学物理研究所 | Industrial organic waste gas treatment and cleaning process |
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| CN107596859A (en) * | 2017-11-03 | 2018-01-19 | 成都来宝石油设备有限公司 | Petroleum chemical industry exhaust treatment system |
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| CN107854956A (en) * | 2017-11-03 | 2018-03-30 | 成都来宝石油设备有限公司 | Waste gas processing method based on activated carbon |
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| CN113413740B (en) * | 2021-06-30 | 2022-10-14 | 福建省利邦环境工程有限公司 | Plastic regeneration waste gas purification treatment device and working method thereof |
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Address after: 351110 Putian City, Fujian province Jiangkou Town Hanjiang District thick Peak Village No. 100 Patentee after: Cai Zhihuang Address before: Xinghua Road two 353000 Nanping City, Fujian province celery Yanping District No. 181 Patentee before: Cai Zhihuang |
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Granted publication date: 20091028 Termination date: 20210817 |