CN105498446A - Method for recycling organic matter through organic waste gas adsorption, steam desorption and fractional condensation - Google Patents
Method for recycling organic matter through organic waste gas adsorption, steam desorption and fractional condensation Download PDFInfo
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- CN105498446A CN105498446A CN201610013453.7A CN201610013453A CN105498446A CN 105498446 A CN105498446 A CN 105498446A CN 201610013453 A CN201610013453 A CN 201610013453A CN 105498446 A CN105498446 A CN 105498446A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation 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
- B01D53/02—Separation 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
- B01D53/04—Separation 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 with stationary adsorbents
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation 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
- B01D53/002—Separation 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 condensation
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2253/00—Adsorbents used in seperation treatment of gases and vapours
- B01D2253/10—Inorganic adsorbents
- B01D2253/102—Carbon
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2253/00—Adsorbents used in seperation treatment of gases and vapours
- B01D2253/10—Inorganic adsorbents
- B01D2253/106—Silica or silicates
- B01D2253/108—Zeolites
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2253/00—Adsorbents used in seperation treatment of gases and vapours
- B01D2253/20—Organic adsorbents
- B01D2253/202—Polymeric adsorbents
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2259/00—Type of treatment
- B01D2259/40—Further details for adsorption processes and devices
- B01D2259/40083—Regeneration of adsorbents in processes other than pressure or temperature swing adsorption
- B01D2259/40088—Regeneration of adsorbents in processes other than pressure or temperature swing adsorption by heating
- B01D2259/4009—Regeneration of adsorbents in processes other than pressure or temperature swing adsorption by heating using hot gas
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- Treating Waste Gases (AREA)
Abstract
The invention relates to the field of organic waste gas recycling and provides a method for recycling organic matter through organic waste gas adsorption, steam desorption and fractional condensation. The method includes the steps that after gas to be treated is pretreated with filtering cotton, the gas enters an adsorber filled with an adsorbing agent and is used for removing organic matter, and the purified gas is exhausted into the atmosphere; desorption and regeneration of the adsorbing agent includes the steps of steam desorption and regeneration, hot air drying and cold air cooling, and steam and desorbed gas are separated through a two-stage condenser. By means of two-step fractional condensation, high-boiling-point organic matter and low-boiling-point organic matter are separated, and the concentration of the recycled organic matter is increased. A small amount of treated gas which is not condensed is introduced into a gas inlet and mixed with inlet waste gas, secondary adsorption is carried out, and it is guaranteed that no tail gas exceeding standards is exhausted in the whole process. Organic matter recycling purity is high, energy consumption is low, and secondary pollution is avoided.
Description
Technical field
The present invention relates to organic exhaust gas and reclaim field, particularly relate to a kind of organic exhaust gas adsorption-steam desorption-fractional condensaion and reclaim organic method and device.
Background technology
Volatile organic matter (VOCs) not only has serious toxic action to health, is also one of major reason of haze formation.In industrial production, a large amount of uses of organic solvent result in the generation of organic exhaust gas, not only to environment, are also the serious wastings of resources.At present, absorption-steam desorption-condensation recovery technology, because its treatment effect is good, safe coefficient is high, recyclable organic advantage, widely uses in the process of organic exhaust gas.But this technology is in operation, to there is condensate liquid separation costs high, the shortcoming of incoagulability tail gas discharge beyond standards.
Chinese invention patent CN104740973A discloses the retracting device of organic solvent in a kind of high-concentration organic waste gas, wherein the gas of institute's desorption outer row after condensation and gas-liquid separation, and not solidifying organic gas enters air on a small quantity, pollutes.Invention CN103585854A discloses a kind of charcoal absorption, N
2the technique of desorption recycling organic exhaust gas, it adopts hot nitrogen desorption, and because nitrogen is incoagulable gas, institute's desorption organic exhaust gas condensation rate of recovery is low, and energy consumption is high.Patent of invention CN104815518A discloses a kind of organic exhaust gas advanced purification treatment system and processing method thereof, and carry out separated to the organic solvent that condensation is reclaimed in the method, energy consumption is high.
Summary of the invention
The technical problem to be solved in the present invention is, overcomes the deficiencies in the prior art, provides a kind of organic exhaust gas adsorption-steam desorption-fractional condensaion and reclaims organic method and device.
For technical solution problem, solution of the present invention is:
A kind of organic exhaust gas adsorption-steam desorption-fractional condensaion is provided to reclaim organic method, comprise the following steps:
(1) pending gas is after filter pulp pretreatment, and send into the absorber having loaded adsorbent and remove organic matter, purified gas is disposed to air;
(2) desorption and regeneration of adsorbent
In absorber, pass into steam, desorption and regeneration is carried out to the adsorbent after using; When being realized desorption by adsorb organic compound and reaching more than 95%, stop passing into steam, in absorber, pass into hot-air, continue 15 ~ 30min, to carry out dry process to adsorbent and the organic matter that desorption is residual further; Then open blower fan, pass into cold air and absorber is cooled, continue 5 ~ 15min; The desorption and regeneration process of adsorbent completes, and absorber puts into operation again;
Carry out in the process of desorption and regeneration passing into steam, after steam and desorption gas discharge absorber, enter in the lump in primary condenser and carry out elementary condensation; Once condensed lime set is delivered to oil water separator and is separated (main component is water, high boiling point organic compound and water soluble organic substance), and on-condensible gas is then sent into secondary condenser and carried out time condensation; Lime set after time condensation sends into storage tank (main component is low-boiling-point organic compound), and remaining on-condensible gas is sent to exhaust gas inlet, again carries out adsorption treatment with after new pending gas and vapor permeation;
Carry out in dry process passing into hot-air, after hot-air and desorption gas discharge absorber, equally through condensed in two stages process, remaining on-condensible gas sends exhaust gas inlet back to for adsorption treatment again.
In the present invention, described absorber at least comprises two and is arranged in parallel, is used alternatingly; When using a part of absorber to carry out organic matter recycling, the process of adsorbent desorption and regeneration is carried out to other absorber.
In the present invention, in the desorption and regeneration process of adsorbent, the temperature of the water vapour passed in absorber is 110 ~ 200 DEG C; During dry process, the hot air temperature passed into is 60 ~ 90 DEG C; After passing into chilled air cools, the temperature in adsorption tanks is down to room temperature.
In the present invention, desorption gas is after primary condenser, and temperature is down to 50 ~ 80 DEG C; Desorption gas is after secondary condenser, and temperature is down to-50 ~ 10 DEG C.
In the present invention, described adsorbent is any one in Honeycombed active carbon absorbent, activated carbon fiber adsorbing substance, zeolite molecular sieve or polymeric adsorbent.
Present invention also offers one to reclaim organic device for organic exhaust gas adsorption-steam desorption-fractional condensaion, comprise the absorber that desorbing agent is housed; Described absorber at least comprises two and is arranged in parallel, is used alternatingly;
Exhaust gas entrance is connected to the bottom of each absorber respectively by pipeline, and pipeline is equipped with filter cotton; The top of absorber establishes purified gas delivery pipe, jet chimney and hot-air duct respectively; Absorber bottoms is also provided with desorption gas delivery pipe, and desorption gas delivery pipe connects with primary condenser, secondary condenser successively, and the outlet of secondary condenser is connected to exhaust gas entrance; Lime set delivery pipe bottom primary condenser is connected to oil water separator, and the lime set delivery pipe bottom secondary condenser is connected to lime set storage tank.
In the present invention, described primary condenser utilizes cooling water to realize heat exchange, connects primary condenser and circulating water cooling tower by water circulating pump through cooling water pipe.
In the present invention, be connected to a blower fan at the secondary condenser port of export.
In the present invention, described secondary condenser is any one in steam compression type condenser, absorption chiller, steam-sprayed condenser or semiconductor cooling condenser.
After treatment, in the oil water separator of apparatus of the present invention, isolate water soluble organic substance and high boiling point organic compound, in lime set storage tank, collect low-boiling-point organic compound.
Compared with prior art, the advantage that the present invention has is:
1, utilize two step fractional condensaions, higher boiling and low-boiling-point organic compound are separated from each other, improve reclaimed organic concentration.
2, for a small amount of on-condensible gas after treatment, pass into air inlet and mix with inlet exhaust, carry out second adsorption, ensure that overall process does not exceed standard exhaust emissions.
3, the NMHC class that the present invention is applicable to gasoline in gas station, the industry such as petroleum vapor recovery and chemical industry, application, synthetic leather, rubber plastic product, printing packaging, textile printing and dyeing, wooden industry, shoemaking, chemical fibre, Life service industry, storage transport, building decoration and electronic information of diesel oil is discharged, benzene homologues class, ester class, alcohols, ketone and the organic recycling of aldehydes, it is high that organic matter reclaims purity, energy consumption is low, non-secondary pollution.
Accompanying drawing explanation
Fig. 1 is the structural representation of organic exhaust gas adsorption-steam desorption-fractional condensaion recovery organic matter device with two absorbers.
1-exhaust gas inlet; 2-steam inlet; 3-hot-air inlets; 4,5-clean gas outlet;
6-cold gas exports; 7,8-filter cotton; 9,10-absorber; 11-primary condenser;
12-oily-water seperating equipment; 13-water circulating pump; 14-circulating water cooling tower;
15-secondary condenser; 16-lime set storage tank; 17-blower fan; 18-27 is valve.
Fig. 2 is the structural representation of organic exhaust gas adsorption-steam desorption-fractional condensaion recovery organic matter device with three absorbers.
28-exhaust gas inlet; 29-steam inlet; 30-hot-air inlets; 31,32,33-clean gas outlet; 34-cold gas exports; 35,36,37-filter cotton; 38,39,40-absorber; 41-primary condenser; 42-oily-water seperating equipment; 43-water circulating pump; 44-circulating water cooling tower;
45-secondary condenser; 46-lime set storage tank; 47-blower fan; 48-61 is valve.
Detailed description of the invention
Embodiment 1:
The present embodiment provides the organic exhaust gas adsorption-steam desorption-fractional condensaion with two absorbers to reclaim organic matter device, and structural representation is shown in Fig. 1.Device comprises: 1-exhaust gas inlet; 2-steam inlet; 3-hot-air inlets; 4,5-clean gas outlet; 6-cold gas exports; 7,8-filter cotton; 9,10-absorber; 11-primary condenser; 12-oily-water seperating equipment; 13-water circulating pump; 14-circulating water cooling tower; 15-secondary condenser; 16-lime set storage tank; 17-blower fan; 18-27 is valve.
Honeycombed active carbon absorbent is filled with in described absorber 9 and absorber 10.
Circulating water is adopted in described primary condenser 11; Steam compression type refrigeration is adopted in described secondary condenser 15.
Change when described filter cotton 7 and filter cotton 8 can utilize corresponding absorber to remain static.
By this application of installation in the process of certain factory's polluted air from paint booth, this waste gas air quantity is 4000m
3/ h, outlet temperature about 30 DEG C, main component is dimethylbenzene and NMHC, and total concentration is about 800mg/m
3.Utilize the organic exhaust gas adsorption-steam desorption-fractional condensaion in the present embodiment to reclaim this waste gas of organic matter device process, main operational steps is as follows:
(A1) open valve 18,19, this house exhaust enters treating apparatus from exhaust gas inlet 1, flows through filter pulp 7, removes particle and oiliness droplet, then enters absorption in absorber 9, and Purge gas enters air from clean gas outlet 4.When absorber 9 carries out adsorption operation, valve 22 remains closed, and absorber 10 does not carry out work;
(A2) adsorb after 7 days, open valve 22 and 23, absorber 10 starts to carry out adsorption operation.Valve-off 18 and 19, opens valve 20,21 and 26, passes into 110 DEG C of water vapours, carry out desorption and regeneration to acticarbon from steam inlet in absorber 9.Steam and desorption gas are discharged by valve 21 and are entered primary condenser 11 in absorber 9, by cooling water heat exchange condensation, temperature is down to 80 DEG C, lime set enters oil water separator 12 and is separated, and on-condensible gas enters secondary condenser 15, by vapour compression refrigeration system condensation, temperature is down to-10 DEG C, lime set enters lime set storage tank 16 and collects, and a small amount of on-condensible gas enters exhaust gas inlet 1, mixes carry out second adsorption with pending waste gas;
(A3) steam desorption is after 30 minutes, stops passing into steam, passes into 80 DEG C of hot-airs from hot-air inlets 3 in absorber 9, carries out dry process and the organic matter that desorption is residual further to adsorbent.Go out the hot-air of absorber 9 and desorption gas after condensed in two stages, a small amount of on-condensible gas enters exhaust gas inlet 1, mixes carry out second adsorption with pending waste gas;
(A4) heated air drying is after 15 minutes, valve-off 20 and 26, opens valve 19 and 27, opens blower fan 17, and the cold air extracting Wind Volume cools absorber 9;
(A5), after cooling 5 minutes, close blower fan 17, valve 19, valve 21 and valve 27, absorber 9 returns to normal temperature, enters static condition.After absorber 10 adsorbs 7 days, open valve 18 and valve 19, absorber 9 starts adsorption process.
Repeat the step of A2 ~ A5, complete the desorption and regeneration to absorber 10, package unit desorption completes, and enters absorption phase, so circulation, repeatedly.
After being processed by the method, this Painting Shop tail gas is purified, and dimethylbenzene, NMHC clearance all reach more than 99%.After desorption-condensation process completes, in oily-water seperating equipment 12, be recovered to a large amount of toluene and dimethylbenzene, be recovered to a large amount of NMHC in storage tank 16, and purity be high.
Embodiment 2:
The present embodiment provides the organic exhaust gas adsorption-steam desorption-fractional condensaion with two absorbers to reclaim organic matter device, and structural representation is shown in Fig. 1.Device comprises: 1-exhaust gas inlet; 2-steam inlet; 3-hot-air inlets; 4,5-clean gas outlet; 6-cold gas exports; 7,8-filter cotton; 9,10-absorber; 11-primary condenser; 12-oily-water seperating equipment; 13-water circulating pump; 14-circulating water cooling tower; 15-secondary condenser; 16-lime set storage tank; 17-blower fan; 18-26 is valve.
Activated carbon fiber adsorbing substance is filled with in described absorber 9 and absorber 10.
Circulating water is adopted in described primary condenser 11; Absorption refrigeration is adopted in described secondary condenser 15.
Change when described filter cotton 7 and filter cotton 8 can utilize corresponding absorber to remain static.
By this application of installation in the process of synthetic leather enterprise dry method waste gas, this waste gas air quantity is 10000m
3/ h, outlet temperature about 35 DEG C, main component is DMF, 2-butanone and methyl acetate, and total concentration is about 200mg/m
3.Utilize the organic exhaust gas adsorption-steam desorption-fractional condensaion in the present embodiment to reclaim this waste gas of organic matter device process, main operational steps is as follows:
(A1) open valve 18,19, this house exhaust enters treating apparatus from exhaust gas inlet 1, flows through filter pulp 7, removes particle and oiliness droplet, then enters absorption in absorber 9, and Purge gas enters air from clean gas outlet 4.When absorber 9 carries out adsorption operation, valve 22 remains closed, and absorber 10 does not carry out work;
(A2) adsorb after 10 days, open valve 22,23, absorber 10 starts to carry out adsorption operation.Valve-off 18 and valve 19, open valve 20, valve 21 and valve 26, passes into 120 DEG C of water vapours, carry out desorption and regeneration to acticarbon from steam inlet in absorber 9.Steam and desorption gas are discharged by valve 21 and are entered primary condenser 11 in absorber 9, by cooling water heat exchange condensation, temperature is down to 70 DEG C, lime set enters oil water separator 12 and is separated, and on-condensible gas enters secondary condenser 15, by vapour compression refrigeration system condensation, temperature is down to 10 DEG C, lime set enters storage tank 16 and collects, and a small amount of on-condensible gas enters exhaust gas inlet 1, mixes carry out second adsorption with pending waste gas;
(A3) steam desorption is after 30 minutes, stops passing into steam, passes into 100 DEG C of hot-airs from hot-air inlets 3 in absorber 9, carries out dry process and the organic matter that desorption is residual further to adsorbent.Go out the hot-air of absorber 9 and desorption gas after condensed in two stages, a small amount of on-condensible gas enters exhaust gas inlet 1, mixes carry out second adsorption with pending waste gas;
(A4) heated air drying is after 20 minutes, valve-off 20 and valve 26, opens valve 19 and 27, opens blower fan 17, and the cold air extracting Wind Volume cools absorber 9;
(A5), after cooling 5 minutes, close blower fan 17, valve 19, valve 21 and valve 27, absorber 9 returns to normal temperature, enters static condition.After absorber 10 adsorbs 7 days, open valve 18 and valve 19, absorber 9 starts adsorption process.
Repeat the step of A2 ~ A5, complete the desorption and regeneration to absorber 10, package unit desorption completes, and enters absorption phase, so circulation, repeatedly.
After being processed by the method, this Painting Shop tail gas is purified, and DMF, 2-butanone and methyl acetate clearance all reach more than 99%.After desorption-condensation process completes, be recovered to the DMF aqueous solution and 2-butanone in oily-water seperating equipment 12, be recovered to a large amount of methyl acetate in storage tank 16, and purity be high.
Embodiment 3:
The present embodiment provides the organic exhaust gas adsorption-steam desorption-fractional condensaion with three absorbers to reclaim organic matter device, and structural representation is shown in Fig. 2.Device comprises: 28-exhaust gas inlet; 29-steam inlet; 30-hot-air inlets; 31,32,33-clean gas outlet; 34-cold gas exports; 35,36,37-filter cotton; 38,39,40-absorber; 41-primary condenser; 42-oily-water seperating equipment; 43-water circulating pump; 44-circulating water cooling tower; 45-secondary condenser; 46-lime set storage tank; 47-blower fan; 48-61 is valve.
A certain amount of zeolite molecular sieve is filled with in described absorber 38,39,40.
Circulating water is adopted in described primary condenser 41; Semiconductor refrigeration system is adopted in described secondary condenser 45.
Change when described filter cotton 35,36,37 can utilize corresponding absorber to remain static.
By this application of installation in the process of certain vulcanization of rubber house exhaust, this waste gas air quantity is 70000m
3/ h, outlet temperature about 25 DEG C, main component is toluene and carbon disulfide, and total concentration is about 50mg/m
3.Utilize the organic exhaust gas adsorption-steam desorption-fractional condensaion in the present embodiment to reclaim this waste gas of organic matter device process, main operational steps is as follows:
(A1) valve 48,49,52 and 53 is opened, this house exhaust enters treating apparatus from exhaust gas inlet 28, flows through filter pulp 35 and 36, removes particle and oiliness droplet, enter absorption in absorber 38 and 39 again, Purge gas enters air from clean gas outlet 31 and 32.In this process, valve 56 remains closed, and absorber 40 does not carry out work;
(A2) adsorb after 14 days, open valve 56 and 57, absorber 40 starts adsorption operation.Valve-off 48 and valve 49, open valve 50,51 and 60, passes into 200 DEG C of steam, carry out desorption and regeneration to zeolite molecular sieve from steam inlet 29 in absorber 38.Steam and desorption gas are discharged by valve 51 and are entered primary condenser 41 in absorber 38, by cooling water heat exchange condensation, temperature is down to 50 DEG C, lime set enters oil water separator 42 and is separated, and on-condensible gas enters secondary condenser 45, by semiconductor refrigeration system condensation, temperature is down to-50 DEG C, lime set enters storage tank 46 and collects, and a small amount of on-condensible gas enters exhaust gas inlet 28, mixes carry out second adsorption with pending waste gas;
(A3) steam desorption is after 60 minutes, stops passing into steam, passes into 180 DEG C of hot-airs from hot-air inlets 30 in absorber 38, carries out dry process and the organic matter that desorption is residual further to adsorbent.Go out the hot-air of absorber 38 and desorption gas after condensed in two stages, a small amount of on-condensible gas enters exhaust gas inlet 28, mixes carry out second adsorption with pending waste gas;
(A4) heated air drying is after 30 minutes, valve-off 50 and valve 60, opens valve 49 and valve 61, opens blower fan 47, and the cold air extracting Wind Volume cools absorber 38;
(A5), after cooling 15 minutes, absorber 38 returns to normal temperature, and valve-off 49, valve 51, valve 61 and blower fan 47, absorber 38 enters static condition.Adsorb after 14 days, open valve 48 and valve 49, absorber 38 starts adsorption process.
Repeat the step of A2 ~ A5, complete the desorption and regeneration to absorber 39 and 40, package unit desorption completes, and enters absorption phase, so circulation, repeatedly.
After being processed by the method, this Painting Shop tail gas is purified, and toluene and carbon disulfide clearance all reach more than 99%.After desorption-condensation process completes, in oily-water seperating equipment 42, be recovered to a large amount of toluene and dimethylbenzene, be recovered to a large amount of carbon disulfide in storage tank 46, and purity be high.
Embodiment 4:
The present embodiment provides the organic exhaust gas adsorption-steam desorption-fractional condensaion with three absorbers to reclaim organic matter device, and structural representation is shown in Fig. 2.Device comprises: 28-exhaust gas inlet; 29-steam inlet; 30-hot-air inlets; 31,32,33-clean gas outlet; 34-cold gas exports; 35,36,37-filter cotton; 38,39,40-absorber; 41-primary condenser; 42-oily-water seperating equipment; 43-water circulating pump; 44-circulating water cooling tower; 45-secondary condenser; 46-lime set storage tank; 47-blower fan; 48-61 is valve.
A certain amount of polymeric adsorbent is filled with in described absorber 38,39,40.
Circulating water is adopted in described primary condenser 41; Steam-sprayed refrigeration is adopted in described secondary condenser 45.
Change when described filter cotton 35,36,37 can utilize corresponding absorber to remain static.
By this application of installation in the process of certain chemical enterprise waste gas, this waste gas air quantity is 20000m
3/ h, outlet temperature about 25 DEG C, main component is toluene, isopropyl alcohol and ethyl acetate, and total concentration is about 300mg/m
3.Utilize the organic exhaust gas adsorption-steam desorption-fractional condensaion in the present embodiment to reclaim this waste gas of organic matter device process, main operational steps is as follows:
(A1) valve 48,49,52 and 53 is opened, this house exhaust enters treating apparatus from exhaust gas inlet 28, flows through filter pulp 35 and 36, removes particle and oiliness droplet, enter absorption in absorber 38 and 39 again, Purge gas enters air from clean gas outlet 31 and 32.In this process, valve 56 remains closed, and absorber 40 does not carry out work;
(A2) adsorb after 14 days, open valve 56 and 57, absorber 40 starts adsorption operation.Valve-off 48 and valve 49, open valve 50,51 and 60, passes into 100 DEG C of steam, carry out desorption and regeneration to zeolite molecular sieve from steam inlet 29 in absorber 38.Steam and desorption gas are discharged by valve 51 and are entered primary condenser 41 in absorber 38, by cooling water heat exchange condensation, temperature is down to 50 DEG C, lime set enters oil water separator 42 and is separated, and on-condensible gas enters secondary condenser 45, by semiconductor refrigeration system condensation, temperature is down to 0 DEG C, lime set enters storage tank 46 and collects, and a small amount of on-condensible gas enters exhaust gas inlet 28, mixes carry out second adsorption with pending waste gas;
(A3) steam desorption is after 50 minutes, stops passing into steam, passes into 90 DEG C of hot-airs from hot-air inlets 30 in absorber 38, carries out dry process and the organic matter that desorption is residual further to adsorbent.Go out the hot-air of absorber 38 and desorption gas after condensed in two stages, a small amount of on-condensible gas enters exhaust gas inlet 28, mixes carry out second adsorption with pending waste gas;
(A4) heated air drying is after 20 minutes, valve-off 50 and valve 60, opens valve 49 and valve 61, opens blower fan 47, and the cold air extracting Wind Volume cools absorber 38;
(A5), after cooling 10 minutes, absorber 38 returns to normal temperature, and valve-off 49, valve 51, valve 61 and blower fan 47, absorber 38 enters static condition.Adsorb after 14 days, open valve 48 and valve 49, absorber 38 starts adsorption process.
Repeat the step of A2 ~ A5, complete the desorption and regeneration to absorber 39 and 40, package unit desorption completes, and enters absorption phase, so circulation, repeatedly.
After being processed by the method, this chemical industry tail gas is purified, and toluene, isopropyl alcohol and ethyl acetate clearance all reach more than 99%.After desorption-condensation process completes, in oily-water seperating equipment 42, be recovered to a large amount of toluene and aqueous isopropanol, be recovered to a large amount of ethyl acetate in storage tank 46, and purity be high.
Claims (9)
1. organic exhaust gas adsorption-steam desorption-fractional condensaion reclaims an organic method, it is characterized in that, comprise the following steps:
(1) pending gas is after filter pulp pretreatment, and enter the absorber having loaded adsorbent and remove organic matter, purified gas is disposed to air;
(2) desorption and regeneration of adsorbent
In absorber, pass into steam, desorption and regeneration is carried out to the adsorbent after using; When being realized desorption by adsorb organic compound and reaching more than 95%, stop passing into steam, in absorber, pass into hot-air, continue 15 ~ 30min, to carry out dry process to adsorbent and the organic matter that desorption is residual further; Then open blower fan, pass into cold air and absorber is cooled, continue 5 ~ 15min; The desorption and regeneration process of adsorbent completes, and absorber puts into operation again;
Carry out in the process of desorption and regeneration passing into steam, after steam and desorption gas discharge absorber, enter in the lump in primary condenser and carry out elementary condensation; Once condensed lime set delivers to oil water separator separation, and on-condensible gas is then sent into secondary condenser and carried out time condensation; Lime set after time condensation sends into storage tank, and remaining on-condensible gas is sent to exhaust gas inlet, again carries out adsorption treatment with after new pending gas and vapor permeation;
Carry out in dry process passing into hot-air, after hot-air and desorption gas discharge absorber, equally through condensed in two stages process, remaining on-condensible gas sends exhaust gas inlet back to for adsorption treatment again.
2. method according to claim 1, is characterized in that, described absorber at least comprises two and is arranged in parallel, is used alternatingly; When using a part of absorber to carry out organic matter recycling, the process of adsorbent desorption and regeneration is carried out to other absorber.
3. method according to claim 1, is characterized in that, in the desorption and regeneration process of adsorbent, the temperature of the steam passed in absorber is 110 ~ 200 DEG C; During dry process, the hot air temperature passed into is 60 ~ 90 DEG C; After passing into chilled air cools, the temperature in adsorption tanks is down to room temperature.
4. method according to claim 1, is characterized in that, desorption gas is after primary condenser, and temperature is down to 50 ~ 80 DEG C; Desorption gas is after secondary condenser, and temperature is down to-50 ~ 10 DEG C.
5. method according to claim 1, is characterized in that, described adsorbent is any one in Honeycombed active carbon absorbent, activated carbon fiber adsorbing substance, zeolite molecular sieve or polymeric adsorbent.
6. reclaim an organic device for organic exhaust gas adsorption-steam desorption-fractional condensaion, comprise the absorber that desorbing agent is housed; It is characterized in that, described absorber at least comprises two and is arranged in parallel, is used alternatingly;
Exhaust gas entrance is connected to the bottom of each absorber respectively by pipeline, and pipeline is equipped with filter cotton; The top of absorber establishes purified gas delivery pipe, jet chimney and hot-air duct respectively; Absorber bottoms is also provided with desorption gas delivery pipe, and desorption gas delivery pipe connects with primary condenser, secondary condenser successively, and the outlet of secondary condenser is connected to exhaust gas entrance; Lime set delivery pipe bottom primary condenser is connected to oil water separator, and the lime set delivery pipe bottom secondary condenser is connected to lime set storage tank.
7. device according to claim 5, is characterized in that, described primary condenser utilizes cooling water to realize heat exchange, connects primary condenser and circulating water cooling tower by water circulating pump through cooling water pipe.
8. device according to claim 5, is characterized in that, is connected to a blower fan at the secondary condenser port of export.
9. device according to claim 5, is characterized in that, described secondary condenser is any one in steam compression type condenser, absorption chiller, steam-sprayed condenser or semiconductor cooling condenser.
Priority Applications (1)
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|---|---|---|---|
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