CN102476013A - Novel organic waste gas recovery method and system - Google Patents
Novel organic waste gas recovery method and system Download PDFInfo
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- CN102476013A CN102476013A CN2010105544013A CN201010554401A CN102476013A CN 102476013 A CN102476013 A CN 102476013A CN 2010105544013 A CN2010105544013 A CN 2010105544013A CN 201010554401 A CN201010554401 A CN 201010554401A CN 102476013 A CN102476013 A CN 102476013A
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Abstract
The invention relates to a novel organic waste gas recovery method and a novel organic waste gas recovery system, which belong to the field of environmental protection. By the organic waste gas recovery method utilizing activated carbon fibers and utilizing nitrogen gas as a desorption medium, organic waste gas and nitrogen gas can be recovered and reutilized simultaneously by the aid of a fixed-bed adsorber through hot nitrogen gas desorption, wherein the fixed-bed adsorber utilizes activated carbon fibers as adsorbent. Due to hot nitrogen gas desorption, secondary pollutant can be avoided, environment-friendly emission reaching the standards can be realized, an adsorption layer is kept dry, the utilization rate of the activated carbon fibers is increased, and the service life of the activated carbon fibers is prolonged. Since water vapor desorption is omitted, corrosion of equipment is avoided and manufacturing cost of equipment is reduced greatly. In addition, the novel organic waste gas recovery method has excellent effect on recovering solvent with high water solubility or easy to be hydrolyzed and organic waste gas with high boiling point, products recovered by the method is low in water content, solvent quality is high, and operating cost can be reduced.
Description
Technical field
The present invention relates to the environmental protection field; From vapourous mixture, reclaiming higher boiling gaseous compound such as normality be liquid compound, relates in particular to from what industries such as printing, light industry, coating, chemical industry, electronics produced in process of production to contain multiple organic exhaust gas of recovery and cyclic utilization method organic waste gas waste gas.
Background technology
NACF (ACF) is also claimed fibrous activated carbon, is high-efficiency activated sorbing material and environment-friendly engineering material that performance is superior to active carbon.Its carbon atom above 50% is positioned at surfaces externally and internally, is built into unique adsorption structure, is called as the superficiality solid.It is by fibrous presoma, forms through the certain procedure carbonization-activation.Flourishing specific area and narrower pore-size distribution make it have adsorption/desorption speed and bigger adsorption capacity faster; And because it can be processed as different shapes such as felt, cloth, paper easily; And have the acid and alkali-resistance corrosion resistance characteristic, make one of which come out just to obtain that people pay close attention to widely and deep research.Be used widely in fields such as environmental protection, catalysis, medicine, military projects at present.
The NACF solvent recovery process was mainly used in toluene, xylenes, thiacyclohexane, halogenated hydrocarbons etc. and was insoluble in the organic recovery of water in the past; For example; Chinese patent ZL200510200344.8 discloses a kind of method of automatic reclaiming process for industrial organic exhaust gas, the method that above-mentioned patent adopts water vapour desorption, static layering to reclaim.Though have the heat of transformation high with the water vapour desorption, desorption fully, be prone to advantage such as condensation, also have following shortcoming:
(1) produce secondary emission thing sewage, sewage intractable when particularly reclaiming the big organic matter of solubility, it is high to handle operating cost with rectifying column.
(2) when desorption, a large amount of water vapor condensations are arranged in the carbon fiber adsorption and catalytic combustion layer, though still very high through the water content of dry wind purging NACF, influence its absorption property, reduced utilization rate.When containing material such as facile hydrolysis material or halogenated hydrocarbons in organic waste gas, under the effect of high-temperature water vapor, equipment very easily corrodes, and it is many to reclaim in the product impurity.
When (3) work condition environment was relatively poor, the impurity such as dust that air-flow is carried secretly can be accumulated in NACF, saltout, NACF loses activity under the effect such as filling.
(4) some are contained the occasion of high boiling substance, because effectively desorb of water vapour, adsorption rate can descend much after above-mentioned technology and device moved a period of time, can not normally move.
Summary of the invention
To the prior art problem, the present invention proposes novel method for organic waste gas recovery, expands the application of activated carbon fiber adsorbing substance, and the stripping gas after the enrichment reclaims through condensation or absorption pattern, realizes zero release of pollutant.
The present invention also provides novel organic waste gas recycling system.
With nitrogen is the active carbon fiber organic gas recovery method of desorption medium, comprises the steps: 1, adsorbs, and organic exhaust gas is adsorbed by absorber after gas gathering system is collected; 2, desorption, organic exhaust gas obtains the desorption mist through the desorbing agent desorption: 3, reclaim, the desorption mist can be recycled; It is characterized in that: said absorber comprise two groups above be the fixed-bed adsorber of adsorbent with the NACF, said desorbing agent is a hot nitrogen, said recycling comprises the recycling of organic exhaust gas and nitrogen.
Said hot nitrogen temperature is 90-400 ℃, and the mode of heating of said nitrogen is electrical heating, heat-conducting oil heating or high-pressure water vapor heating.
Said recovery is adopted the condensing and recycling mode or is absorbed way of recycling.
Said organic exhaust gas before absorption through supercooling, filtration.
Through the subcooled water cooling, the heat of displacement is used to add thermal desorption nitrogen to said desorption mist before recovery.
Before the said desorption, need carrying out online oxygen content and temperature monitoring in the absorber.
A kind of is the activated carbon fiber organic waste gas recycling system of desorption medium with nitrogen; Comprise gas gathering system, adsorption system, desorption system and recovery system, it is characterized in that: said adsorption system comprise two groups above be the fixed-bed adsorber of adsorbent with the NACF, adopting hot nitrogen in the said desorption system is desorbing agent.
Said organic exhaust gas needs through pretreatment system before getting into adsorption system, and said pretreatment system comprises filter and forecooler.
Comprise online oxygen content and temperature monitoring system in the said desorption system.
Said online oxygen content and temperature monitoring system are with PLC or the chain in two stages control of DCS; When oxygen content>buzzer gives the alarm 2% the time; Heater stops heating; Replenish the gas outlet exhaust of nitrogen circulation blower fan from absorber and carry out nitrogen replacement, be lower than 2% up to oxygen content, heater is carried out desorption again; When oxygen content>buzzer gives the alarm 5% the time, heater stops heating, and emergent nitrogen valve is opened automatically, charges into a large amount of nitrogen from absorber and replaces.
As the desorb medium, with the organic matter desorption that is enriched on the NACF, organic exhaust gas in the desorption gaseous mixture and nitrogen reclaim through condensation or absorption pattern the novel method for organic waste gas recovery of the present invention with hot nitrogen, realize zero release of pollutant.With the NACF is the fixed-bed adsorber of adsorbent; Be divided into two groups; One absorption, one desorption, the nitrogen desorb influences its absorption property thereby avoided water vapour to be condensate in the carbon fiber adsorption and catalytic combustion layer; Thereby also solved the decomposition reaction that under the effect of high-temperature water vapor, produces because of the part organic exhaust gas simultaneously and caused reclaiming the many problems of product impurity; Because the heating-up temperature of nitrogen can reach about 400 ℃, for the effective higher boiling organic gas of desorb of water vapour, effectively desorb of high temperature nitrogen.The inventive method is for water-soluble big or the recovering effect of the solvent of facile hydrolysis and high-boiling-point waste organic gas is good especially, and it is low to reclaim in the product water content, and the solvent quality height can reduce operating cost.
Organic exhaust gas preferably through filtering and the cooling preprocessor, for low boiling point solvent, just can reclaim it in the cooling preprocessing process, and need not get into whole absorption, desorption process before absorption, has practiced thrift resource; When work condition environment was relatively poor, the impurity such as dust that air-flow is carried secretly can be accumulated in NACF in adsorption process, and its absorption micropore is stopped up, and caused absorption property to descend.
The desorption mist through the heat exchanger heat exchange, has effectively utilized waste heat before recovery, reduced follow-up (recovery) and handled energy consumption, and the heat of displacement can be used for heated nitrogen simultaneously, has practiced thrift the energy.
Before heating desorption, carry out nitrogen replacement, with online temperature and oxygen content test macro monitoring system ruuning situation, and control nitrogen safety valve, ensured the safe operation of reclaimer.Compared following advantage with traditional NACF solvent recovery process:
(1) uses the hot nitrogen desorption, do not produce secondary pollution, can realize the environment protection standard discharging.
(2) adsorption layer keeps dry, and has improved the utilization rate of NACF, has prolonged the service life of NACF.
(3) owing to,, greatly reduce the device fabrication cost so equipment does not have etching problem without the water vapour desorption.
(4) for water-soluble big or the solvent recovery effect of facile hydrolysis is good, it is low to reclaim in the product water content, and solvent quality is high, can reduce operating cost.
(5) because desorption gas can be heated to about 400 degree,, expand the range of application of retracting device so retracting device can be applied to contain the recovery of high-boiling-point waste organic gas.
Description of drawings
Fig. 1 is the process chart of the inventive method
Wherein each label is listed as follows among the figure: 1-organic exhaust gas collection wind system, 2-air inducing blower fan, 3-air-flow control triple valve, 4-filter and forecooler pretreatment system; The 5-cooling blower, 6-heater, 7-heat exchanger, 8-forecooler; 9-desorption circulating fan, 10-solvent recovery unit, 11-displacement gas floss hole, 12-organic matter holder; Al, Bl-organic exhaust gas inlet, A7, B7-cold gas inlet valve, A6, B6-desorption mixed gas outlet, A5, B5-purified gas floss hole; A2, B2-hot nitrogen inlet, A3, B3-normally replace nitrogen inlet, A4, the emergent nitrogen inlet of B4-, A, B-absorber.
The specific embodiment
Fig. 1 is the process chart of the inventive method, and organic exhaust gas collection wind system 1 has been collected working air current pending in the process of the present invention.Air inducing blower fan 2 provides power, and 3 controls of air-flow control triple valve flow to, and when system works, opens air inlet and organic exhaust gas is introduced processor adsorbs, and when system maintenance, opens the organic exhaust gas exhaust outlet.Filter and forecooler pretreatment system 4 can be removed most suspended substances and granule foreign in the air-flow, and can regulate EGT and humidity, with service life, the raising adsorption effect that prolongs NACF.Cooling blower 5 can be introduced absorber A, B through cold gas inlet valve A7, B7 with environment gas, reduces the adsorption layer temperature.Heater 6 can be heated to the 80-400 degree with nitrogen, and high temperature nitrogen is used for the regeneration of NACF.A3, B3-normally replace nitrogen inlet, scalable flow size, and can accurate metered flow.A4, the emergent nitrogen inlet of B4-can charge into a large amount of nitrogen during valve open at short notice.The carbon fiber adsorption and catalytic combustion core is equipped with in absorber A, B inside, two absorbers hocket absorption, desorption, cooling procedure.Heat exchanger 7 can utilize the preceding desorption gas of back desorption gas heat, makes full use of waste heat, reduces energy consumption.Forecooler 8 usefulness cold water are further lowered the temperature desorption gas, reduce the subsequent treatment energy consumption.Solvent recovery unit 12 reclaims the solvent in the desorption gas, can be that the condensing and recycling device also can be to absorb recover.The desorption circulating fan can make desorption nitrogen form closed circuit, practices thrift nitrogen use level.
Operational process of craft
1. open air-flow control triple valve 3, air inlet air inducing blower fan 2; The waste gas that contains multiple organic exhaust gas that the workshop produces is introduced in the airduct by gas gathering system 1; Remove most suspended substances and large granular impurity through filter and condenser pretreatment system 4; Regulate gas flow temperature and humidity, send into carbon fiber adsorption and catalytic combustion device A absorption through organic exhaust gas inlet Al then, purified gas passes through purified gas outlet A5 from the absorber top discharge.Another absorber B handles holding state or desorption, the state of cooling at this moment.
2. when absorber A feeds organic exhaust gas a period of time arrival breakthrough point; Close organic exhaust gas inlet Al; Organic exhaust gas switches to another absorber B and adsorbs, and opens normal displacement nitrogen inlet A3 and replaces, and online oxygen content monitor test oxygen content was less than 2% o'clock; Normal displacement nitrogen inlet A3 and purified gas outlet A5; Open desorption gas inlet A2, desorption mixed gas outlet A6, circulation desorption blower fan 9, this moment, heater 6 was started working, and nitrogen is heated to the 80-400 degree carbon fiber adsorption and catalytic combustion layer is carried out desorption.Displacement nitrogen and desorption nitrogen flow are effectively made full use of to guarantee nitrogen by the strict control of mass flowmenter.Be located at line oxygen content and temperature monitoring system interior oxygen content and the adsorption bed temperature of monitoring system at any time in addition.With the chain in two stages control of PLC, in desorption process when oxygen content buzzer gives the alarm 2% the time, heater 6 stops heating, opens normal displacement nitrogen inlet A3 and floss hole 11 air inlet nitrogen replacements, restarts desorption process after oxygen content is lower than 2%; Oxygen content>5% o'clock remove buzzer and give the alarm, heater 6 stops outside the heating, opens emergent nitrogen inlet A4, sprays into the nitrogen of a large amount of (3-5 of amount is doubly at ordinary times), to reduce oxygen content.
3. desorption finishes, and closes A2 and desorption mixed gas outlet A6, opens cold gas inlet valve A7, clean gas outlet valve A5, feeds a large amount of environmental gas to reduce the adsorption box temperature, so that the organic exhaust gas in the waste gas is adsorbed in next circulation effectively by cooling blower 5.
4. above-mentioned steps 1-3 process Automatic Cycle is carried out, and two absorbers replace absorption, desorption, cooling.
5. the desorption air-flow is lowered the temperature through heat exchanger 7, forecooler 8, the organic exhaust gas that reclaims in the desorption gas through solvent recycler 10 again, and recovered solvent is stored in the storage tank 12.Recovery tower can be the condensing and recycling device, also can be the absorption tower.
The condensing and recycling method is formed according to organic exhaust gas, for prevent low-boiling-point organic compound the condenser pipe surface condensation become solid influence recovering effect can branch single-stage condensing and recycling or multi-stage condensing reclaim, condensate liquid gets into storage tank, clean gas can be sent the workshop back to make full use of nitrogen.The solvent that the condensing and recycling method is collected not like generally with fixed bed with steam method of reproduction recovered solvent, its moisture is extremely low, but direct reuse.
Because organic matter is through the NACF enrichment, the desorption throughput is little, and organic concentration is high, and absorption process can reclaim organic exhaust gas effectively.
6. for the waste gas reclaimer that contains a small amount of high boiling point organic compound, organic efficiency descends after operation a period of time, can under nitrogen protection, nitrogen temperature be heated to about 400 degree, makes the high boiling point organic compound desorption that is adsorbed on the NACF.Because of high boiling substance content is few, the desorption temperature when moving at ordinary times is controlled at about 100 degree, and regularly high-temperature activation can keep carbon fiber adsorption and catalytic combustion efficient can save operating cost again.
7. the occasion big for air quantity, that concentration is high can be designed to the second adsorption device, promptly is recycled to another absorber again through the organic exhaust gas that once adsorbs and carries out second adsorption, and this covering device needs at least three adsorption boxes.Because the charcoal fiber is desorption medium with the hot nitrogen, so the adsorption layer air penetrability is high, windage is little, and second adsorption is easy to implement, thereby further reduces organic content in the discharging gas.
Claims (4)
1. novel method for organic waste gas recovery comprises the steps: 1), absorption, organic exhaust gas is adsorbed by absorber after gas gathering system is collected; 2), desorption, organic exhaust gas obtains the desorption mist through the desorbing agent desorption; 3), reclaim, the desorption mist can be recycled; It is characterized in that: said absorber comprise two groups above be the fixed-bed adsorber of adsorbent with the NACF, said desorbing agent is a hot nitrogen, said recycling comprises the recycling of organic exhaust gas and nitrogen.
2. novel method for organic waste gas recovery according to claim 1, said recovery adopt the condensing and recycling mode or absorb way of recycling.
3. novel organic waste gas recycling system; Comprise gas gathering system, adsorption system, desorption system and recovery system, it is characterized in that: said adsorption system comprise two groups above be the fixed-bed adsorber of adsorbent with the NACF, adopting hot nitrogen in the said desorption system is desorbing agent.
4. novel organic waste gas recycling system according to claim 3, said organic exhaust gas needs through pretreatment system before getting into adsorption system, and said pretreatment system comprises filter and forecooler.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010105544013A CN102476013A (en) | 2010-11-23 | 2010-11-23 | Novel organic waste gas recovery method and system |
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| CN2010105544013A CN102476013A (en) | 2010-11-23 | 2010-11-23 | Novel organic waste gas recovery method and system |
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| CN102476013A true CN102476013A (en) | 2012-05-30 |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105169884A (en) * | 2015-09-06 | 2015-12-23 | 天津奥展兴达化工技术有限公司 | Solid adsorbent regeneration purifying technology and apparatus thereof |
| CN108273356A (en) * | 2018-03-05 | 2018-07-13 | 江苏汇金环保科技有限公司 | A kind of high-temp waste gas activated carbon adsorption nitrogen stripping condensate recovery system |
| CN110975851A (en) * | 2019-12-26 | 2020-04-10 | 江苏南大环保科技有限公司 | Resin desorption regeneration method for adsorbing organic matters |
| CN111167257A (en) * | 2018-11-13 | 2020-05-19 | 吉能科技股份有限公司 | High-efficiency and high-safety solvent recovery equipment |
| CN113617183A (en) * | 2021-06-23 | 2021-11-09 | 佛山市科蓝环保科技股份有限公司 | VOCs desorption device and VOCs desorption method of activated carbon assembly |
| CN114392632A (en) * | 2022-01-30 | 2022-04-26 | 浙江省生态环境科学设计研究院 | Nitrogen-protected organic waste gas condensation and recovery treatment method for degreasing process |
-
2010
- 2010-11-23 CN CN2010105544013A patent/CN102476013A/en active Pending
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105169884A (en) * | 2015-09-06 | 2015-12-23 | 天津奥展兴达化工技术有限公司 | Solid adsorbent regeneration purifying technology and apparatus thereof |
| CN108273356A (en) * | 2018-03-05 | 2018-07-13 | 江苏汇金环保科技有限公司 | A kind of high-temp waste gas activated carbon adsorption nitrogen stripping condensate recovery system |
| CN111167257A (en) * | 2018-11-13 | 2020-05-19 | 吉能科技股份有限公司 | High-efficiency and high-safety solvent recovery equipment |
| CN110975851A (en) * | 2019-12-26 | 2020-04-10 | 江苏南大环保科技有限公司 | Resin desorption regeneration method for adsorbing organic matters |
| CN110975851B (en) * | 2019-12-26 | 2022-06-03 | 江苏南大环保科技有限公司 | Resin desorption regeneration method for adsorbing organic matters |
| CN113617183A (en) * | 2021-06-23 | 2021-11-09 | 佛山市科蓝环保科技股份有限公司 | VOCs desorption device and VOCs desorption method of activated carbon assembly |
| CN114392632A (en) * | 2022-01-30 | 2022-04-26 | 浙江省生态环境科学设计研究院 | Nitrogen-protected organic waste gas condensation and recovery treatment method for degreasing process |
| CN114392632B (en) * | 2022-01-30 | 2022-11-11 | 浙江省生态环境科学设计研究院 | Nitrogen-protected organic waste gas condensation and recovery treatment method for degreasing process |
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Application publication date: 20120530 |