CN1112228C - Method of treating organic waste gas containing vapor - Google Patents
Method of treating organic waste gas containing vapor Download PDFInfo
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- CN1112228C CN1112228C CN 00110696 CN00110696A CN1112228C CN 1112228 C CN1112228 C CN 1112228C CN 00110696 CN00110696 CN 00110696 CN 00110696 A CN00110696 A CN 00110696A CN 1112228 C CN1112228 C CN 1112228C
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- waste gas
- organic waste
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Abstract
The present invention relates to a catalytic combustion method for treating organic waste gas containing water vapour. After the organic waste gas containing a large amount of the water vapour is condensed to remove most of water vapour, the organic waste gas is mixed with air to enter a concentration homogenizer, and the organic waste gas enters a catalytic reactor finally to be oxidated to remove harmful components in the organic waste gas. The method of the present invention can reduce the water vapour to influence the performance of a catalyst for catalyzing combustion to a maximum extent and greatly reduce the size of a catalytic combustion device simultaneously, and can reduce the temperature shock to influence the catalytic reaction performance of the catalyst and prolong the catalyst life. The method of the present invention can be effectively used for the purification treatment of various organic waste gases containing the water vapour, such as DTA exhaust gas.
Description
The invention belongs to a kind of processing method that is rich in the water vapour organic exhaust gas, particularly relate to a kind of biphenyl/biphenyl ether heat carrier and purify the processing method that is rich in the water vapour organic exhaust gas that produces in the purification process.
With biphenyl/biphenyl ether eutectic mixture (U.S. title DowthermA is hereinafter to be referred as DTA) that 26.5/73.5 (w/w) forms, be the heat carrier of using always, particularly as the heat carrier of polyethylene production technology.In using the DTA process, the DTA decomposes produces the benzene series thing, needs reduction vaporization to keep DTA purity.Depressurized system adopts hydro-steam ejector pump, and jet pump water vapour and the catabolite extracted out from DTA etc. have constituted DTA waste gas, and wherein, the overwhelming majority is a water vapour, can reach 99w%; Other component is DTA, benzene, dimethylbenzene, cyclohexane, phenol, nitrogen etc.At present, DTA waste gas is not also had effective processing method, use the waste gas of several companies of this technology all directly to enter atmosphere, because well-known toxic action of benzene series thing and strong bad smell cause the atmosphere pollution of certain degree.
This waste gas belongs to a kind of organic compounds, and processing method commonly used has: heating power burning method, Production by Catalytic Combustion Process, absorption method, condensation absorption method etc.Wherein Production by Catalytic Combustion Process is suitable for handling that complicated component, organic concentration are low, the organic exhaust gas of no recovery value, advantage such as purifying rate height, energy consumption are low, non-secondary pollution that it has.Typical catalytic combustion technology is that waste gas feeds beds through after the preheating, and organic matter is CO by catalytic oxidation in the waste gas
2, H
2O.There are a lot of applied catalysis burning process to handle the example of organic exhaust gas both at home and abroad, adopt catalytic combustion technology to handle VOC waste gas (the Kosusko M et al.J Air Waste Management Assoc that the baking chamber produces as Massachusetts, United States one tame printing house, 1990,40 (2): 254), the Fujian China printing house also adopt Production by Catalytic Combustion Process handle organic compounds such as benzene,toluene,xylene (Liu Biwu etc. Industrial Catalysis, 1993, (4): 11); Improved absorption～catalytic combustion process integration (Howard J.ChemEngng, 1990, (9): be that catalytic combustion is combined with adsorption operations 106), handle big flow, low-concentration organic exhaust gas, this helps reducing unit scale and energy consumption.But these technologies all are unwell to the high vapour content of processing, organic concentration is low, organic concentration changes greatly, the DTA waste gas of complicated component.
The purpose of this invention is to provide a kind of processing method, can handle cost-effectively low with vapour content height, organic concentration, organic concentration changes greatly, complicated component is the DTA waste gas of feature.
Processing method of the present invention is: organic waste gas containing vapor at first carries out condensation, the fixed gas that produces with enter the concentration homogenizer that adsorbent is housed after oxygen-containing gas mixes, the gaseous mixture heating of coming out from the concentration homogenizer enters the reactor that catalyst for catalytic combustion is housed, with organic substance oxidation removal wherein.
Be the detail that example describes the inventive method in detail with the DTA treatment of waste gas below:
The DTA EGT that is produced by process units adopts condensation operation to make the DTA EGT reduce to 20～40 ℃ more than 100 ℃, and DTA waste gas is separated into condensate liquid and fixed gas two parts.Condensate liquid mainly consists of water and contains the low organic matter of macromolecule condensation point such as a small amount of DTA, can be by DTA water insoluble and density reclaim DTA greater than the characteristic of water, discharging of waste liquid is handled to the sewage-farm.Moisture content is in the fixed gas: 2.3%～6.2% (v), fixed gas organic concentration (total hydrocarbon) is 3000～60000mg/m
3, condensation operation can adopt conventional cooler, as shell-and-tube cooler, can take water-cooling method.
Allocate fixed gas into a certain proportion of oxygen-containing gas, be generally air, the coefficient of excess air ratio of air excess amount and theoretical requirement (add) is 1～4.Mist feeds the concentration homogenizer of filled with adsorbent, makes that the organic concentration fluctuation range diminishes in the on-condensible gas, obtains the metastable off-gas flows of organic concentration.Operable adsorbent comprises: active carbon, molecular sieve, activated alumina etc., the operation air speed is: 500～6000h
-1
Mist after the concentration homogenizing enters the catalytic reactor beds after being heated to uniform temperature, and reaction temperature is 200～400 ℃, is preferably 250～350 ℃, and volume space velocity is 2000～50000h
-1, be preferably 10000～40000h
-1, use sphere or honeycomb catalyst, adopt on the metal oxide and support noble metal, as Pd/Al
2O
3, Pd-Pt/Al
2O
3Deng, bullion content is 0.1～2w%, this catalyst should have or approaching following physical parameter: specific surface 200～300m
2/ g, pore volume 0.6～0.8cm
3/ g, bore dia (on average) 9～11nm.Liberated heat is by reclaiming with the heat exchange of catalytic reactor inlet waste gas in the course of reaction.
Treated DTA waste gas harmful constituent clearance can reach more than 90%, and NMHC concentration is lower than the 120mg/m of national standard to the regulation of emission source in a organized way when entering atmosphere
3(Technology Standards Division of State Bueau of Environmental Protection compiles, the atmospheric environmental standards operation manuals).
The inventive method also can be used for other vapour content and (surpass 30v% as vapour content greatly, the preferred water steam content surpasses 50v%) the purified treatment of organic exhaust gas, the processing of spraying vacuum distillation tower tail gas as the oil plant water vapour, and the processing of aqueous solution still-process discharging gas such as organic acid, alcohol, aldehyde, ketone, ester.
Utilize the inventive method, handle again fixed gas being carried out catalytic combustion after a large amount of moisture content condensation separation, avoiding a large amount of water vapours to introduce catalytic combustion reactor influences catalyst performance, reduces the scale of catalytic combustion system greatly simultaneously, and can the recovery section organic matter.By absorption, the desorption of adsorbent in the concentration homogenizer, gas concentration fluctuation is relaxed, avoid influencing the catalyst reactivity worth because gas concentration changes the reaction bed temperature cataclysm that causes greatly, thus prolongation catalyst service life; The effect that utilizes catalyst in the catalytic reactor with condensation-concentration homogenizing after waste gas fully be converted into innocuous gas, reached the purpose of effectively, stably handling various organic waste gas containing vapors.
Further specify below by embodiment:
Embodiment 1
Certain process units DTA toxic emission situation:
Delivery temperature: 104 ℃, discharge capacity: 400m
3/ h
Waste gas is formed: water vapour 99w%, organic matter 0.8w%, all the other are nitrogen, oxygen.
Organic matter is formed: benzene 4.5%, dimethylbenzene 22%, comonomer 4.7%, vinyl cyclohexane 27%, phenol 6.4%, cyclohexane 21.4% and other organic component.
After DTA waste gas is introduced into exhaust treatment system, at first enter condenser, condensation temperature is controlled to be 25 ℃, and condensate liquid enters the sewage-farm after reclaiming no value; Fixed gas organic matter mean concentration (total hydrocarbon): 60000mg/m
3, fixed gas enters the concentration homogenizer that loads active carbon in proportion with after air mixes; Enter catalytic reactor with the tail gas heat exchange and through behind the preheater, under the honeycomb catalyst effect that is loaded with noble metal, be converted into harmless tail gas and discharge emptying after heat recovery.Employed catalyst is the honeycombed catalyst, Pd-Pt/Al
2O
3, bullion content is 1.8w%, the physical parameter of catalyst: specific surface 260m
2/ g, pore volume 0.8cm
3/ g, bore dia (on average) 10nm.
Operating condition: condenser heat exchange area 36m
2, quantity of circulating water 21t/h
Coefficient of excess air is 4
Concentration homogenizer air speed 5000h
-1
Pd-Pt/Al
2O
3Honeycombed catalyst
300 ℃ of catalytic reactor inlet temperatures, air speed 40000h
-1
Result of the test: catalytic reactor total hydrocarbon clearance 93.6%
Tail gas NMHC concentration 76.7mg/m
3
Embodiment 2
DTA waste gas condenses to 35 ℃, organic concentration in the fixed gas (total hydrocarbon): 3000mg/m
3
Operating condition: coefficient of excess air 1
Concentration homogenizer air speed 500h
-1
Pd-Pt/Al
2O
3Honeycombed catalyst
300 ℃ of catalytic reactor inlet temperatures, air speed 20000h
-1
Other operating condition is with embodiment 1.
Result of the test: catalytic reactor total hydrocarbon clearance 94.9%
Tail gas NMHC 16.4mg/m
3
Embodiment 3
DTA waste gas, organic concentration (total hydrocarbon): 30000mg/m in the fixed gas after the condensation
3
Operating condition: coefficient of excess air is 2
Concentration homogenizer air speed 2500h
-1
Pd-Pt/Al
2O
3Honeycombed catalyst
280 ℃ of catalytic reactor inlet temperatures, air speed 10000h
-1
Other operating condition is with embodiment 1.
Result of the test: catalytic reactor total hydrocarbon clearance 94.6%
Tail gas NMHC 68.1mg/m
3
Embodiment 4
Certain water vapour sprays the jet pump discharging gas of vacuum tower, organic concentration (total hydrocarbon): 30000mg/m in the fixed gas after the condensation
3
Operating condition: coefficient of excess air 2
Concentration homogenizer air speed 2500h
-1
Pd/Al
2O
3Spherical catalyst, Pd content are 0.2w%
The physical parameter of catalyst: specific surface 240m
2/ g, pore volume 0.76cm
3/ g,
Bore dia (on average) 10nm.
350 ℃ of catalytic reactor inlet temperatures, air speed 10000h
-1
Other operating condition is with embodiment 1.
Result of the test: catalytic reactor total hydrocarbon clearance 95.0%
Tail gas NMHC 66.7mg/m
3
Claims (9)
1, a kind of processing method of organic waste gas containing vapor, organic waste gas containing vapor is carried out condensation, fixed gas mixes the back heating and enters the reactor that catalyst for catalytic combustion is housed with oxygen-containing gas, organic substance oxidation is wherein removed, it is characterized in that the gaseous mixture of fixed gas and oxygen-containing gas at first passes through the concentration homogenizer that adsorbent is housed before heating.
2, in accordance with the method for claim 1, the operating temperature that it is characterized in that described condensing steps is 20～40 ℃.
3, according to claim 1 or 2 described methods, it is characterized in that moisture content is in the described fixed gas: 2.3v%～6.2v%, fixed gas organic concentration are 3000～60000mg/m
3
4, in accordance with the method for claim 1, it is characterized in that described oxygen-containing gas is an air, coefficient of excess air is 1～4.
5, in accordance with the method for claim 1, it is characterized in that the employed adsorbent of described concentration homogenizer is selected from active carbon, molecular sieve, activated alumina.
6, in accordance with the method for claim 1, the volume space velocity that it is characterized in that described concentration homogenizer is: 500～6000h
-1
7, in accordance with the method for claim 1, the reaction temperature that it is characterized in that described catalytic reactor is 200～400 ℃, and volume space velocity is 2000～50000h
-1
8, according to claim 1 or 7 described methods, the reaction temperature that it is characterized in that described catalytic reactor is 250～350 ℃, and volume space velocity is 10000～40000h
-1
9, in accordance with the method for claim 1, it is characterized in that catalytic reactor uses sphere or honeycombed noble metal catalyst, bullion content is 0.1～2w%, and the physical property of catalyst is: specific surface 200～300m
2/ g, pore volume 0.6～0.8cm
3/ g, average pore diameter 9～11nm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 00110696 CN1112228C (en) | 2000-07-20 | 2000-07-20 | Method of treating organic waste gas containing vapor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 00110696 CN1112228C (en) | 2000-07-20 | 2000-07-20 | Method of treating organic waste gas containing vapor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1335197A CN1335197A (en) | 2002-02-13 |
| CN1112228C true CN1112228C (en) | 2003-06-25 |
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ID=4580675
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| CN 00110696 Expired - Lifetime CN1112228C (en) | 2000-07-20 | 2000-07-20 | Method of treating organic waste gas containing vapor |
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Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100342949C (en) * | 2005-01-21 | 2007-10-17 | 钟礼晖 | Purifying treatment of industrial organic waste gas with waste gas conversion into energy circulating utilization |
| JP3956993B1 (en) * | 2006-01-30 | 2007-08-08 | 石川島播磨重工業株式会社 | Volatile organic compound processing method and volatile organic compound processing system using gas turbine |
| CN101347684B (en) * | 2007-07-18 | 2010-05-19 | 中国石油化工股份有限公司 | Method for treating tail gas during production processes of polyalcohol |
| CN102049189B (en) * | 2009-10-27 | 2013-01-23 | 中国石油化工股份有限公司 | Method for purifying organic waste gas |
| CN102908799B (en) * | 2011-08-01 | 2014-08-20 | 中国石油化工股份有限公司 | Treatment method for emissions of aromatic hydrocarbon storage tank |
| CN103212274B (en) * | 2012-01-20 | 2015-06-17 | 杰智环境科技股份有限公司 | Organic exhaust gas concentration buffer bed and biological filter bed system using concentration buffer bed |
| CN103768822B (en) * | 2012-10-23 | 2016-06-22 | 中国石油化工股份有限公司 | A kind of processing method of unsaturated polyester (UP) steam |
| CN103768823B (en) * | 2012-10-23 | 2016-03-02 | 中国石油化工股份有限公司 | A kind of recycling processing method of unsaturated polyester (UP) waste gas |
| CN108993140A (en) * | 2018-09-26 | 2018-12-14 | 南京都乐制冷设备有限公司 | A kind of processing fuel oil VOC containing steamsCondensation adsorption catalytic oxidizing equipment and method |
-
2000
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