CN109045925A - A kind of VOCs waste gas recovery processing unit and method - Google Patents
A kind of VOCs waste gas recovery processing unit and method Download PDFInfo
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- CN109045925A CN109045925A CN201810939007.8A CN201810939007A CN109045925A CN 109045925 A CN109045925 A CN 109045925A CN 201810939007 A CN201810939007 A CN 201810939007A CN 109045925 A CN109045925 A CN 109045925A
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- 239000012855 volatile organic compound Substances 0.000 title claims abstract description 67
- 238000011084 recovery Methods 0.000 title claims abstract description 46
- 239000002912 waste gas Substances 0.000 title claims abstract description 43
- 238000000034 method Methods 0.000 title abstract description 29
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims abstract description 276
- 239000006096 absorbing agent Substances 0.000 claims abstract description 208
- 239000007789 gas Substances 0.000 claims abstract description 138
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 138
- 230000004087 circulation Effects 0.000 claims abstract description 59
- 238000003795 desorption Methods 0.000 claims abstract description 46
- 238000001179 sorption measurement Methods 0.000 claims abstract description 45
- 239000007788 liquid Substances 0.000 claims abstract description 40
- 238000010521 absorption reaction Methods 0.000 claims abstract description 35
- 238000009833 condensation Methods 0.000 claims abstract description 23
- 230000005494 condensation Effects 0.000 claims abstract description 23
- 238000010438 heat treatment Methods 0.000 claims abstract description 23
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 21
- 239000001301 oxygen Substances 0.000 claims abstract description 21
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 21
- 239000008246 gaseous mixture Substances 0.000 claims abstract description 12
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 72
- 238000001816 cooling Methods 0.000 claims description 44
- 239000003463 adsorbent Substances 0.000 claims description 14
- 239000000428 dust Substances 0.000 claims description 10
- 238000003672 processing method Methods 0.000 claims description 8
- 230000002159 abnormal effect Effects 0.000 claims description 6
- 238000006386 neutralization reaction Methods 0.000 claims description 5
- 238000001914 filtration Methods 0.000 claims description 4
- 230000008676 import Effects 0.000 claims description 3
- 239000000203 mixture Substances 0.000 claims description 2
- 238000007781 pre-processing Methods 0.000 claims description 2
- 230000008901 benefit Effects 0.000 abstract description 8
- 238000000926 separation method Methods 0.000 abstract description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 10
- 239000003960 organic solvent Substances 0.000 description 8
- 230000008569 process Effects 0.000 description 8
- 238000004064 recycling Methods 0.000 description 7
- 238000000746 purification Methods 0.000 description 6
- 239000002699 waste material Substances 0.000 description 5
- 229910052799 carbon Inorganic materials 0.000 description 4
- 230000007935 neutral effect Effects 0.000 description 4
- 239000005416 organic matter Substances 0.000 description 4
- 239000010865 sewage Substances 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 3
- 230000001681 protective effect Effects 0.000 description 3
- 230000001172 regenerating effect Effects 0.000 description 3
- 239000003610 charcoal Substances 0.000 description 2
- 239000000498 cooling water Substances 0.000 description 2
- 239000000835 fiber Substances 0.000 description 2
- 239000002808 molecular sieve Substances 0.000 description 2
- 239000008188 pellet Substances 0.000 description 2
- 230000008929 regeneration Effects 0.000 description 2
- 238000011069 regeneration method Methods 0.000 description 2
- URGAHOPLAPQHLN-UHFFFAOYSA-N sodium aluminosilicate Chemical compound [Na+].[Al+3].[O-][Si]([O-])=O.[O-][Si]([O-])=O URGAHOPLAPQHLN-UHFFFAOYSA-N 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 241000206761 Bacillariophyta Species 0.000 description 1
- 239000002250 absorbent Substances 0.000 description 1
- 230000002745 absorbent Effects 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000009835 boiling Methods 0.000 description 1
- 239000012267 brine Substances 0.000 description 1
- 239000003518 caustics Substances 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 238000009841 combustion method Methods 0.000 description 1
- 239000000110 cooling liquid Substances 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 229910001873 dinitrogen Inorganic materials 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 238000011049 filling Methods 0.000 description 1
- 150000008282 halocarbons Chemical class 0.000 description 1
- 230000036541 health Effects 0.000 description 1
- 230000007062 hydrolysis Effects 0.000 description 1
- 238000006460 hydrolysis reaction Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- QJGQUHMNIGDVPM-UHFFFAOYSA-N nitrogen group Chemical group [N] QJGQUHMNIGDVPM-UHFFFAOYSA-N 0.000 description 1
- 239000010815 organic waste Substances 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 238000005554 pickling Methods 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- HPALAKNZSZLMCH-UHFFFAOYSA-M sodium;chloride;hydrate Chemical compound O.[Na+].[Cl-] HPALAKNZSZLMCH-UHFFFAOYSA-M 0.000 description 1
- 239000002689 soil Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 241000894007 species Species 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 230000001839 systemic circulation Effects 0.000 description 1
- 239000003643 water by type Substances 0.000 description 1
Classifications
-
- 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
-
- 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2257/00—Components to be removed
- B01D2257/70—Organic compounds not provided for in groups B01D2257/00 - B01D2257/602
- B01D2257/708—Volatile organic compounds V.O.C.'s
-
- 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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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Analytical Chemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Treating Waste Gases (AREA)
Abstract
The present invention relates to a kind of VOCs waste gas recovery processing unit and methods, exhaust gas is carried out in absorber to carry out desorption processing after adsorption treatment reaches saturation, circulated air is provided using circulating fan, during absorber desorption is filled with nitrogen, the replacement of oxygen in absorber and nitrogen charging circulation line is come out by nitrogen discharge pipeline, so that being full of nitrogen in absorber, then nitrogen is heated by heating pipeline, the VOCs being adsorbed on absorber is desorbed in the nitrogen of heating, the VOCs and circulated air that desorption comes out are mixed into gaseous mixture, gas-liquid separation is carried out after condensation recycles VOCs, the gas released by nitrogen discharge pipeline enters another absorber in parallel through main air blower again and carries out adsorption treatment, while realization releases stress, it avoids being discharged into atmosphere pollution environment progress circulation absorption Processing, the present invention carry out desorption using anaerobic indirect heating manner to fast, the low advantage of operating cost with desorption rate.
Description
Technical field
The present invention relates to VOCs waste gas pollution control and treatment field more particularly to the waste gas recovery processing units and method of a kind of VOCs.
Background technique
VOCs is the volatile organic compound that a kind of boiling point is lower than 250 DEG C, is had very to human health and ecological environment
Big harmfulness.It is effectively recycled this kind of organic exhaust gas, is not only avoided that environmental pollution, but also turn waste into wealth, reduces enterprise
The operating cost of industry, social benefit and economic benefit with higher.
The currently used processing method of VOCs waste gas purification technology has combustion method, oxidizing process, absorption process, absorption method, biology
Method etc..Wherein absorption method is a kind of common organic waste-gas purification effective ways, is to utilize various solid absorbent (such as diatoms
Soil, active carbon (pellet, fiber, honeycomb), molecular sieve etc.) adsorption cleaning is carried out to the pollutant in discharge exhaust gas, wherein activity
Charcoal has the performances such as adsorption rate is high, bound species are wide, easy solution absorption, accordingly acts as adsorbent and is widely used.
Absorption method equipment is simple, applied widely, purification efficiency is high, is a kind of traditional waste gas pollution control and treatment technology and mesh
Preceding most widely used Treatment process.It needs to regenerate adsorbent (or being desorption), existing frequently-used regeneration after the completion of absorption
For steam regeneration and regenerated with hot air.At present using absorption method recovery processing VOCs method in, it is most widely used still with
It based on steam desorption, is first regenerated with active carbon of the steam to adsorption saturation, is become after the mixed gas desorbed is cooling
Liquid realizes the purpose of recycling.It has the following problems in this way:
1) after being desorbed, there are condensed waters in active carbon, cannot thoroughly dry, influence absorption property；
2) very big to equipment corrosion under hydrolysis when handling halogenated hydrocarbon substance；
3) it discharges and contains quantity of organic in water, be unable to direct emission, reprocess costly.
It is desorbed using hot-air, is generally used for the treatment process that continuous processing mode is burning.There are the problem of be mainly: 1)
In desorption process, the hidden danger that gas has burning or explosion is mixed.2) heat capacity of air value is smaller, and the air capacity used is larger,
Desorption temperature can be reached.
In recent years, it develops with organic exhaust gas recovery and treatment methods such as nitrogen desorptions.Such as application No. is
201310520571.3 Chinese patent discloses the technique of a kind of activated carbon adsorption, N2 desorption recovery processing organic exhaust gas,
It is first replaced with N2 when desorption, reusable heat N2 desorption, the gas being desorbed out passes through condensing recovery organic matter.Using doing for branch condensation
Method solves the problems, such as to be difficult to condense under systemic circulation air quantity, but in this way, significant fraction containing being not engaged in condensation of organic matter and
It is to be recycled directly back to charcoal bed, condensation efficiency is extremely low.Application No. is 201510347973.7 Chinese patent, discloses a kind of N2 and add
The active carbon VOCs treatment technique and its device of thermal vacuum desorption, are first vacuumized absorber with vacuum pump when being desorbed
Afterwards, it is passed through hot nitrogen and persistently vacuumizes desorption, recycle organic matter after the gas low temperature of extraction is condensed.This technique is first
When vacuumizing, expansion multiple is very big at low pressures for the gas in adsorption tanks, causes vacuum pump flow rate larger, and energy consumption is larger, and
And vacuum desorption is not thorough.
Summary of the invention
The technical problem to be solved by the present invention is in view of the deficiencies of the prior art, provide a kind of VOCs waste gas recovery processing
Device and method, at least one to solve the above technical problems.
On the one hand, the technical scheme to solve the above technical problems is that a kind of VOCs waste gas recovery processing unit,
Include:
Pipeline is adsorbed, the absorber in pipeline is adsorbed and adsorption treatment is carried out to exhaust gas, and gas is discharged by treated；
Nitrogen charging circulation line, when absorber is filled with nitrogen, nitrogen charging circulation line provides circulated air；
Nitrogen discharge pipeline, nitrogen discharge pipeline are used to be exhausted when pressure is more than designated value in absorber, discharge
Pressure in absorber simultaneously comes out the replacement of oxygen in absorber and nitrogen charging circulation line；It is discharged through nitrogen discharge pipeline useless
Gas is again introduced into absorber and carries out adsorption treatment；
Pipeline is heated, heat cycles pipeline heats nitrogen in the absorber being desorbed；Hot nitrogen is to suction
The VOCs invested in absorber is desorbed；
Condensing recovery circulation line, the VOCs that absorber is desorbed out condensing recovery circulation line carry out condensing recovery；
Cooling line, cooling cycle pipeline cool down the absorber for completing desorption；
Self-loopa is realized by circulating fan respectively in nitrogen charging circulation line and condensing recovery circulation line.
Based on the above technical solution, the present invention can also be improved as follows.
Further, including condenser and gas-liquid separator,
The absorber and the circulating fan constitute the nitrogen charging circulation line by piping connection；
Absorber, heater and circulating fan are by pipeline all at heat cycles pipeline；
Absorber, condenser, gas-liquid separator and circulating fan constitute condensing recovery circulation line by pipeline；
It is equipped with inside absorber outside heat exchange coil and/or absorber and heat exchange jacket is installed, heat exchange coil and/or changed
It is passed through water vapour in thermal jacket and constitutes the heating pipeline；
It is passed through recirculated water in heat exchange coil and/or heat exchange jacket and constitutes cooling line.
Further, absorption pipeline further includes main air blower and pretreatment unit, and pretreatment unit is for cooling down exhaust gas
And filtration treatment, pretreatment unit, main air blower and the absorber for carrying out adsorption treatment to exhaust gas pass sequentially through piping connection；
Exhaust gas after adsorption treatment is discharged from absorber.
It further, further include urgent cooling pipeline, the urgent pipeline that cools down when absorber temperature anomaly for cooling down
Processing.
Further, absorber be equipped with exhaust gas inlet, waste gas outlet, circulation wind inlet, circulated air outlet, nitrogen inlet,
Water inlet, discharge outlet, and it is correspondingly provided with exhaust gas inlet valve, waste gas outlet valve, circulated air inlet valve, circulated air outlet valve, nitrogen
Inlet valve, water inlet valve, scupper valve；The gas outlet of pretreatment unit and the air inlet of main air blower pass through piping connection, main wind
The gas outlet of machine is connect with exhaust gas inlet by gas inlet pipeline；The air outlet of circulation wind inlet and circulating fan passes through pipeline
Connection；
Condenser and gas-liquid separator are successively set between the circulated air outlet of absorber and the air inlet of circulating fan
Pipeline on；And condenser and gas-liquid separator parallel connection one condense bypass line, the air inlet of condenser, condensation bypass line,
The gas outlet of gas-liquid separator is respectively equipped with condenser valve, condensation bypass line valve, gas-liquid separator valve；
Urgent cooling pipeline includes water inlet pipe and drainpipe, and water inlet pipe is connect with water inlet, and drainpipe is connect with discharge outlet；
The air outlet of nitrogen discharge piping connection circulating fan and the air inlet of main air blower and nitrogen discharge pipeline is equipped with
Nitrogen discharge valve；
The heat exchange coil and/or the heat exchange jacket be equipped with steam inlet, steam condensate (SC) outlet, circulating water intake,
Circulating water outlet, and it is correspondingly provided with steam inlet valve, steam condensate (SC) outlet valve, circulating water intake valve, circulating water outlet valve；
Wherein, absorber is to be arranged in parallel multiple, and multiple absorbers can alternately work.
On the other hand, the technical scheme to solve the above technical problems is that the following steps are included:
S1: absorption: exhaust gas enters absorber and carries out adsorption treatment, until adsorbent bed penetrates, discharge exhaust gas reaches certain dense
Degree；
S2: nitrogen charging: carrying out nitrogen charging to the absorber that need to be desorbed, and by circulating fan offer circulated air, during nitrogen charging,
When the pressure in absorber be greater than 5-10KPa, be vented by nitrogen discharge pipeline, discharge absorber in pressure, and will absorption
Replacement of oxygen in device and nitrogen charging circulation line, which comes out, makes oxygen content drop to 0.1-5% or less；Wherein, through the nitrogen discharge pipe
The exhaust gas of road discharge is again introduced into absorber and carries out adsorption treatment；
S3: heating: nitrogen in the absorber that need to be desorbed is heated by heating pipeline, is heated to temperature in absorber
Reach 100-140 DEG C, absorber is desorbed in hot nitrogen；
S4: condensing recovery: circulated air passes through absorber and is mixed to get the gaseous mixture containing VOCs with the VOCs being desorbed out, right
VOCs in gaseous mixture condense and separated and recovered with gas-liquid separator；
S5: cooling: after condensing recovery 0.2-4 hours, cooling drop being carried out to the absorber for completing desorption by cooling line
Temperature.
Further, step S1 further includes pretreatment, and the exhaust gas containing VOCs is pre-processed: the temperature of exhaust gas is adjusted
To 0-40 DEG C, exhaust gas is adjusted to neutral (PH=7) by acid-base neutralization, the dust in exhaust gas is filtered, is less than dust content
5ppm removes the moisture content in removing exhaust gas, makes exhaust gas water content no more than 50%；Enter absorber by pretreated exhaust gas to be inhaled
Attached processing.
Further, water vapour is passed through into heat exchange coil and/or heat exchange jacket in step S3 to heat absorber；
Recirculated water is passed through into heat exchange coil and/or heat exchange jacket in step S4 to heat absorber.
Further, further include promptly cooling down, promptly cooled down to absorber absorber temperature is when in an abnormal state.
Further, exhaust gas enters one or several absorbers progress adsorption treatment in step S1, and adsorbent bed penetrates, and discharge is useless
Gas is switched to other one or several absorbers absorption in parallel after reaching a certain concentration.
Compared with prior art, the invention has the following beneficial effects:
(1) present invention carries out exhaust gas in absorber to carry out desorption processing after adsorption treatment reaches saturation, using circulated air
Machine provides circulated air, during absorber desorption is filled with nitrogen, is recycled absorber and nitrogen charging by nitrogen discharge pipeline
Replacement of oxygen in pipeline comes out, so that being full of nitrogen in absorber, then passes through heat exchange coil and/or heat exchange by water vapour
Collet heats nitrogen, and the VOCs being adsorbed on absorber is desorbed in the nitrogen of heating, the VOCs for being desorbed out with
Circulated air is mixed into gaseous mixture, and gas-liquid separation is carried out after condensation and recycles VOCs；
(2) present invention passes through setting nitrogen discharge pipeline, and the pressure during release nitrogen charging in absorber is arranged by nitrogen
It puts the gas that pipeline releases and enters another absorber progress adsorption treatment in parallel through main air blower again, realizing release pressure
While power, avoids being discharged into the progress circulation absorption processing of atmosphere pollution environment, improve waste gas purification rate；
(3) of the invention by the urgent cooling pipeline of setting, it is when in an abnormal state to absorber progress in absorber temperature
Urgent cooling；
(6) present invention loads adsorbent with a kind of completely new absorber to handle VOCs, and uses anaerobic indirect heating manner
It is desorbed, has not only avoided the formed sewage secondary pollution of water vapour desorption and recycling organic solvent is aqueous, but also solved directly
Hot nitrogen desorption as nitrogen thermal capacitance value it is low and caused by nitrogen use level it is big, air circulation is big, the big disadvantage of heat exchange area, thus
It is fast with desorption rate, the low advantage of operating cost, and the organic solvent quality recycled is good, to realize waste utilization, reaches
To environmentally protective purpose.
Detailed description of the invention
Fig. 1 is one embodiment of the invention schematic diagram；
In attached drawing, parts list represented by the reference numerals are as follows:
1- pretreatment unit, 2- main air blower, 3- condenser, 4- gas-liquid separator, 5- circulating fan.
Specific embodiment
The principle and features of the present invention will be described below with reference to the accompanying drawings, and the given examples are served only to explain the present invention, and
It is non-to be used to limit the scope of the invention.
One aspect of the present invention provides a kind of VOCs waste gas recovery processing unit, comprising:
Pipeline is adsorbed, the absorber in pipeline is adsorbed and adsorption treatment is carried out to exhaust gas, and gas is discharged by treated；
Nitrogen charging circulation line, when absorber is filled with nitrogen, nitrogen charging circulation line provides circulated air；
Nitrogen discharge pipeline, nitrogen discharge pipeline are used to be exhausted when pressure is more than designated value in absorber, discharge
Pressure in absorber simultaneously comes out the replacement of oxygen in absorber and nitrogen charging circulation line；It is discharged through nitrogen discharge pipeline useless
Gas is again introduced into absorber and carries out adsorption treatment；
Pipeline is heated, heat cycles pipeline heats nitrogen in the absorber being desorbed；Hot nitrogen is to suction
The VOCs invested in absorber is desorbed；
Condensing recovery circulation line, the VOCs that absorber is desorbed out condensing recovery circulation line carry out condensing recovery；
Cooling line, cooling cycle pipeline cool down the absorber for completing desorption；
Self-loopa is realized by circulating fan respectively in nitrogen charging circulation line and condensing recovery circulation line.
The present invention provides the emission-control equipments containing VOCs, carry out adsorption treatment to exhaust gas in absorber and reach saturation
After carry out desorption processing, in nitrogen charging circulation line, provide circulated air using circulating fan, be filled with the mistake of nitrogen in absorber desorption
Cheng Zhong is come out the replacement of oxygen in absorber and nitrogen charging circulation line by nitrogen discharge pipeline, so that oxygen in absorber
Content reduces, and is then heated by heating pipeline to nitrogen, and the nitrogen of heating carries out the VOCs being adsorbed on absorber
It is desorbed, the VOCs and circulated air for being desorbed out in condensing recovery circulation line are mixed into gaseous mixture, and gas-liquid is carried out after condensation
VOCs is separated and recovered, cooling line cools down the absorber for completing desorption, releases by nitrogen discharge pipeline
Gas enters another absorber progress adsorption treatment in parallel through main air blower again and avoids while realization releases stress
Be discharged into atmosphere pollution environment carry out circulation absorption processing, improve waste gas purification rate, the present invention using anaerobic indirect heating manner into
Row desorption, had not only avoided the formed sewage secondary pollution of water vapour desorption and recycling organic solvent is aqueous, but also solved direct heat
Nitrogen desorption as nitrogen thermal capacitance value it is low and caused by nitrogen use level it is big, air circulation is big, the big disadvantage of heat exchange area, to have
Have that desorption rate is fast, the low advantage of operating cost, and the organic solvent quality recycled is good, to realize waste utilization, reaches
Environmentally protective purpose.
As the preferred embodiments of the present invention, above-mentioned apparatus includes condenser and gas-liquid separator,
The absorber and the circulating fan constitute the nitrogen charging circulation line by piping connection；
Absorber, heater and circulating fan are by pipeline all at heat cycles pipeline；
The absorber, the condenser, the gas-liquid separator and the circulating fan are made up of described cold pipeline
Solidifying recycling circulation line；
It is equipped with inside the absorber outside heat exchange coil and/or the absorber and heat exchange jacket is installed, it is described to change
It is passed through water vapour in hot coil and/or the heat exchange jacket and constitutes the heating pipeline；
It is passed through recirculated water in the heat exchange coil and/or the heat exchange jacket and constitutes the cooling line；
Absorption pipeline further includes main air blower and pretreatment unit, and pretreatment unit is used to carry out at cooling and filtering exhaust gas
Reason, pretreatment unit, main air blower and the absorber for carrying out adsorption treatment to exhaust gas pass sequentially through piping connection；Adsorption treatment
Exhaust gas afterwards is discharged from absorber；
Absorber, condenser, gas-liquid separator, heater and circulating fan are passed through by pipe by piping connection in the present invention
Road connects into each circulation line, and circulating fan realizes that the function of circular treatment exhaust gas, the processing unit structure are simple, at low cost
And purifying rate is high.
It further include urgent cooling pipeline as the preferred embodiments of the present invention, the urgent pipeline that cools down is used for when absorption
Cooling processing is carried out when device temperature anomaly.
As the preferred embodiments of the present invention, absorber be equipped with exhaust gas inlet, waste gas outlet, circulation wind inlet,
Circulated air outlet, nitrogen inlet, water inlet, discharge outlet, and it is correspondingly provided with exhaust gas inlet valve, waste gas outlet valve, circulation wind inlet
Valve, circulated air outlet valve, nitrogen inlet valve, water inlet valve, scupper valve；The gas outlet of pretreatment unit and the air inlet of main air blower
By piping connection, the gas outlet of main air blower is connect with exhaust gas inlet by gas inlet pipeline mouth；Recycle wind inlet and circulation
The air outlet of blower passes through piping connection；
Condenser and gas-liquid separator are successively set between the circulated air outlet of absorber and the air inlet of circulating fan
Pipeline on；And condenser and gas-liquid separator parallel connection one condense bypass line, the air inlet of condenser, condensation bypass line,
The gas outlet of gas-liquid separator is respectively equipped with condenser valve, condensation bypass line valve, gas-liquid separator valve；
Urgent cooling pipeline includes water inlet pipe and drainpipe, and water inlet pipe is connect with water inlet, and drainpipe is connect with discharge outlet；
The air outlet of nitrogen discharge piping connection circulating fan and the air inlet of main air blower and nitrogen discharge pipeline is equipped with
Off-gas discharge valve；
The heat exchange coil and/or the heat exchange jacket be equipped with steam inlet, steam condensate (SC) outlet, circulating water intake,
Circulating water outlet, and it is correspondingly provided with steam inlet valve, steam condensate (SC) outlet valve, circulating water intake valve, circulating water outlet valve；
Absorber is to be arranged in parallel multiple, and multiple absorbers can alternately work, device at runtime, one or more
A absorber absorption, another or multiple absorbers desorb, and adsorb continuous operation.
Another aspect of the present invention provides a kind of VOCs waste gas recovery processing method, comprising the following steps:
S1: absorption: exhaust gas enters absorber and carries out adsorption treatment, until adsorbent bed penetrates, discharge exhaust gas reaches certain dense
Degree；
S2: nitrogen charging: carrying out nitrogen charging to the absorber that need to be desorbed, and by circulating fan offer circulated air, during nitrogen charging,
When the pressure in absorber be greater than 5-10KPa, be vented by nitrogen discharge pipeline, discharge absorber in pressure, and will absorption
Replacement of oxygen in device and nitrogen charging circulation line, which comes out, makes oxygen content drop to 0.1-5% or less；Wherein, through the nitrogen discharge pipe
The exhaust gas of road discharge is again introduced into absorber and carries out adsorption treatment；
S3: heating: nitrogen in the absorber that need to be desorbed is heated by heating pipeline, is heated to temperature in absorber
Reach 100-140 DEG C, absorber is desorbed in hot nitrogen；
S4: condensing recovery: circulated air passes through absorber and is mixed to get the gaseous mixture containing VOCs with the VOCs being desorbed out, right
VOCs in gaseous mixture condense and separated and recovered with gas-liquid separator；
S5: cooling: after condensing recovery 0.2-4 hours, cooling drop being carried out to the absorber for completing desorption by cooling line
Temperature.
As the preferred embodiments of the present invention, step S1 further includes pretreatment, the exhaust gas containing VOCs is carried out pre-
Processing: being adjusted to 0-40 DEG C for the temperature of exhaust gas, and exhaust gas is adjusted to neutral (PH=7) by acid-base neutralization, is filtered in exhaust gas
Dust, so that dust content is less than 5ppm, remove the moisture content in removing exhaust gas, make exhaust gas water content no more than 50%；By pretreatment
Exhaust gas enter absorber carry out adsorption treatment.
As the preferred embodiments of the present invention, step S5 further include: to heat exchange coil and/or heat exchange folder in step S3
Water vapour is passed through in set to heat absorber；
Recirculated water is passed through into heat exchange coil and/or heat exchange jacket in step S4 to heat absorber.
It further include promptly cooling down as the preferred embodiments of the present invention, it is when in an abnormal state in absorber temperature
Promptly cooled down to absorber.
As the preferred embodiments of the present invention, exhaust gas enters one or several absorbers and carries out at absorption in step S1
Reason, adsorbent bed penetrate, and discharge exhaust gas is switched to other one or several absorbers absorption in parallel after reaching a certain concentration, mention
Height absorption working efficiency.
The present invention loads adsorbent with a kind of completely new absorber to handle VOCs, and is carried out using anaerobic indirect heating manner
Desorption, had not only avoided the pollution of sewage secondary formed by water vapor desorption and recycling organic solvent is aqueous, but also solved direct hot nitrogen
Gas desorption as nitrogen thermal capacitance value it is low and caused by nitrogen use level it is big, air circulation is big, the big disadvantage of heat exchange area, to have
Desorption rate is fast, the low advantage of operating cost, and the organic solvent quality recycled is good, to realize waste utilization, reaches green
The purpose that colour circle is protected.
The emission-control equipment provided by the invention containing VOCs and method are illustrated below with reference to Fig. 1.
Embodiment 1:
As shown in Figure 1, the present embodiment is a kind of emission-control equipment containing VOCs, including pretreatment unit 1, main air blower 2,
Absorber A, absorber B, condenser 3, gas-liquid separator 4 and circulating fan 5.
Absorber A be equipped with exhaust gas inlet, waste gas outlet, circulation wind inlet, circulated air outlet, nitrogen inlet, water inlet,
Discharge outlet, and it is correspondingly provided with exhaust gas inlet valve F4, waste gas outlet valve F2, circulated air inlet valve F1, circulated air outlet valve F3, nitrogen
Inlet valve N1, water inlet valve S1, scupper valve S3；
Absorber B be equipped with exhaust gas inlet, waste gas outlet, circulation wind inlet, circulated air outlet, nitrogen inlet, water inlet,
Discharge outlet, and it is correspondingly provided with exhaust gas inlet valve F8, waste gas outlet valve F6, circulated air inlet valve F5, circulated air outlet valve F7, nitrogen
Inlet valve N2, water inlet valve S2, scupper valve S4；
The air inlet of the gas outlet of pretreatment unit 1 and main air blower 2 is by piping connection, the gas outlet of main air blower 2 and useless
Gas import is connected by gas inlet pipeline；The air outlet of circulation wind inlet and circulating fan 5 passes through piping connection；
Condenser 3 and gas-liquid separator 4 be successively set on absorber circulated air outlet and the air inlet of circulating fan 5 it
Between pipeline on；And condenser 3 and 4 parallel connection one of gas-liquid separator condense bypass line, the air inlet of condenser 3, condensation bypass
Pipeline, gas-liquid separator 4 gas outlet be respectively equipped with condenser valve F10, condensation bypass line valve F9, gas-liquid separator valve F11；
Urgent cooling pipeline includes water inlet pipe and drainpipe, and water inlet pipe is connect with water inlet, and drainpipe is connect with discharge outlet；
It is set on the air outlet of nitrogen discharge piping connection circulating fan 5 and the air inlet of main air blower 2 and nitrogen discharge pipeline
There is nitrogen discharge valve N3；
Adsorption tube routes pretreatment unit 1, main air blower 2 and absorber and is made up of piping connection, specifically, pretreatment dress
Setting 1 includes one or more of filter, caustic wash tower, pickling tower, water scrubber, demister, surface air cooler, and absorber is provided with suction
Enclosure material can be equipped with pellet active carbon, activated carbon fibre, absorption resin or molecular sieve according to the property of exhaust gas.
Specifically, exhaust gas by pretreatment unit 1 cooling and filtration treatment after pass through main air blower 2 by exhaust gas inlet into
Aspiration adnexa A, absorber A carry out adsorption treatment to exhaust gas, and VOCs is adsorbed in absorber A, and treated exhaust gas is from exhaust gas
Outlet is discharged through discharge pipe；
Absorber B absorption is switched to after absorber A penetrates saturation, then the absorber A of regenerative adsorption saturation.
Nitrogen charging circulation line is made up of absorber A, condensation bypass line and circulating fan 5 piping connection；
Stop injecting exhaust gas to absorber A, nitrogen is injected into absorber A by nitrogen inlet, and pass through circulating fan 5
The circulated air of offer reduces the oxygen content in absorber；When being filled with nitrogen, when the pressure in absorber is greater than 5-
10KPa opens nitrogen discharge valve, discharges the pressure in absorber, and by the replacement of oxygen in absorber and nitrogen charging circulation line
Out, the gas discharged by nitrogen discharge valve is adsorbed by main air blower 2 into absorber B.
Water vapour composition is passed through in heating tube routing heat exchange coil and/or heat exchange jacket.
Condensing recovery circulation line is passed through by absorber A, condenser 3, gas-liquid separator 4, heater 6 and circulating fan 5
Piping connection is constituted, one or more levels condenser 3 may be selected according to the property of handled exhaust gas in condenser 3, and circulatory mediator is optional
With recirculated water or/and low temperature cool brine；The VOCs and circulated air that absorber A is desorbed out are mixed into condenser 3 through condenser 3
Air inlet gas-liquid separator 4 separate and recycle to the VOCs isolated after condensation, and the gas isolated continues to participate in
Circulation.
Cooling line is constituted by being passed through recirculated water in heat exchange coil and/or heat exchange jacket, after condensing recovery is completed, is passed through
Recirculated water is passed through in heat exchange coil and/or heat exchange jacket to cool down absorber A.
In absorber temperature opening water inlet valve and a drain valve when in an abnormal state, cooling water is injected into absorber, it is right
Absorber is promptly cooled down.
The present embodiment purifies organic waste using three kinds of activated carbon adsorption purification, hot nitrogen desorption and condensing recovery group technologies
Gas, emission-control equipment are controlled by PLC or DCS, have the advantages that intelligent, efficient, safety.
The present embodiment with a kind of completely new absorber filling adsorbent to handle VOCs, and using anaerobic indirect heating manner into
Row desorption, had not only avoided the formed sewage secondary pollution of water vapour desorption and recycling organic solvent is aqueous, but also solved direct heat
Nitrogen desorption as nitrogen thermal capacitance value it is low and caused by nitrogen use level it is big, air circulation is big, the big disadvantage of heat exchange area, to have
Have that desorption rate is fast, the low advantage of operating cost, and the organic solvent quality recycled is good, to realize waste utilization, reaches
Environmentally protective purpose.
The workflow of the present embodiment are as follows:
As shown in Figure 1, through exhaust gas inlet after the pressurization of main air blower 2 after the preprocessed processing of device 1 to suitable absorption of exhaust gas
Valve F4 enters absorber A, and the VOCs in exhaust gas is after adsorbent adsorbs, and clean gas is by Waste gas outlet through waste gas outlet valve F2
Discharge.After absorber A saturation, waste gas outlet valve F6, the exhaust gas inlet valve F8 on absorber B are opened, absorber B is made to start to inhale
Waste gas outlet valve F2, exhaust gas inlet valve F4 attached, be then shut off on absorber A.
Then circulated air inlet valve F1, the circulated air outlet valve F3 on absorber A are opened, condensation bypass line is opened simultaneously
Valve F9 closes condenser valve F10, gas-liquid separator valve F11, opens circulating fan 5, opens nitrogen inlet valve N1 and carries out nitrogen charging,
Nitrogen discharge valve N3 is opened when pressure is greater than 5-10kPa in absorber A, when pressure is less than 2-4kPa, closes nitrogen discharge
Valve N3.When the oxygen content in absorber A is less than 0.1-5% (due to handling different organic matters, according to its physics, chemistry
The difference of property, the oxygen content limit and temperature of control will be different, so setting range herein), close nitrogen inlet
Valve N1 opens steam inlet valve Q1, either on or off steam condensate (SC) valve Q2, heats to absorber, when temperature in absorber A
When greater than 100-140 DEG C, condenser valve F10, gas-liquid separator valve F11 are opened, condensation bypass line valve F9 is closed, is condensed
Recycling opens circulating water intake valve S5 and circulating water outlet valve S6, opens condensation bypass line valve F9, close after 0.2-4 hours
Condenser valve F10 and gas-liquid separator valve F11 are closed, absorber is cooled down, when temperature is less than 30-50 DEG C in absorber A
Circulating water intake valve S5 and circulating water outlet valve S6 is closed, circulating fan 5 is closed, simultaneously closes off circulated air inlet valve F1, circulation
Wind outlet valve F3, opens waste gas outlet valve F2, and waiting is adsorbed next time.
After absorber B saturation, absorption valve waste gas outlet valve F2, the exhaust gas inlet valve F4 on absorber A are opened, makes to adsorb
Device A starts to adsorb, and waste gas outlet valve F6, exhaust gas inlet the valve F8, absorber B being then shut off on absorber B start repetition or more
Desorption process.
Above procedure is automatically controlled by PLC or DCS system, and two absorbers alternately adsorption and desorption makes adsorption process
Continuous operation.
Water inlet valve S1, water inlet valve S2 and scupper valve S3, scupper valve S4 are only applied to temperature and are in mid-winter
When use, as urgent cooling.
Embodiment 2
The present embodiment is a kind of waste gas processing method containing VOCs, comprising the following steps:
S1: pretreatment: the exhaust gas containing VOCs is pre-processed: the temperature of exhaust gas being adjusted to 0-40 DEG C, by exhaust gas
It is adjusted to neutral (PH=7) by acid-base neutralization, filters the dust in exhaust gas, so that dust content is less than 5ppm, goes in removing exhaust gas
Moisture content, make exhaust gas water content no more than 50%；Enter absorber by pretreated exhaust gas and carries out adsorption treatment；
S2: absorption: exhaust gas enters one or several absorbers and carries out adsorption treatment, and adsorbent bed penetrates, and discharge exhaust gas reaches
Other one or several absorbers absorption in parallel is switched to after a certain concentration；
S3: nitrogen charging: nitrogen charging is carried out to the absorber that need to be desorbed, and provides circulated air, nitrogen charging process by circulating fan 5
In, when the pressure in absorber be greater than 5-10KPa, be vented by nitrogen discharge pipeline, discharge absorber in pressure, and will inhale
Replacement of oxygen in adnexa and nitrogen charging circulation line, which comes out, makes oxygen content drop to 0.1-5% or less；Wherein, through the nitrogen discharge
The exhaust gas of pipeline discharge is again introduced into absorber and carries out adsorption treatment；
S4: heating: nitrogen in the absorber that need to be desorbed is heated by heating pipeline, is heated to temperature in absorber
Reach 100-140 DEG C, absorber is desorbed in hot nitrogen；
S5: condensing recovery: circulated air passes through absorber and is mixed to get the gaseous mixture containing VOCs with the VOCs being desorbed out, right
VOCs in gaseous mixture condense and separated and recovered with gas-liquid separator 4；
S6: cooling: after condensing recovery 0.2-4 hours, cooling drop being carried out to the absorber for completing desorption by cooling line
Temperature.
Specifically, step 1: VOCs exhaust gas being pre-processed, including temperature is adjusted to 0~40 DEG C, exhaust gas is passed through
Acid-base neutralization is adjusted to neutral (PH=7), filters the dust in exhaust gas, so that dust content is less than 5ppm, removes the water in removing exhaust gas
Part, make exhaust gas water content no more than 50%.
Step 2: enter one or several absorbers by pretreated exhaust gas and carry out adsorption treatment, adsorbent bed penetrates row
It puts after tail gas reaches a certain concentration and is switched to other one or several absorbers absorption, the then absorption of regenerative adsorption saturation
Device.
Step 3: exhaust gas inlet valve, the waste gas outlet valve for needing regenerative adsorption device are closed, its circulated air inlet valve is opened, follows
Ring wind outlet valve opens circulating fan 5, then opens nitrogen inlet valve nitrogen charging, opens or closes nitrogen discharge valve according to pressure,
Oxygen in absorber and pipeline is cemented out.Oxygen content is set to drop to 0.1-5% or less.
Step 4: opening steam inlet valve and steam condensate (SC) outlet valve carries out absorber to be heated to temperature in absorber
Reach 100-140 DEG C.
Step 5: opening condenser valve and gas-liquid separator valve, closes condensation by-passing valve, and the organic matter in gaseous mixture is cold
It coagulates, and is separated with gas-liquid separator 4.
Step 6: after condensation 30-120 minutes, closing condenser valve and gas-liquid separator valve, opens condensation by-passing valve, uses
Recirculated water carries out absorber to be cooled to 30-50 DEG C.
In absorber temperature opening water inlet valve and a drain valve when in an abnormal state, cooling water is injected into absorber, it is right
Absorber is promptly cooled down.
In the description of this specification, reference term " embodiment one ", " embodiment two ", " example ", " specific example " or
The description of " some examples " etc. means that specific method, device or feature described in conjunction with this embodiment or example are contained in this hair
In at least one bright embodiment or example.In the present specification, schematic expression of the above terms are necessarily directed to
Identical embodiment or example.Moreover, specific features, method, apparatus or the feature of description can be in any one or more realities
Applying can be combined in any suitable manner in example or example.In addition, without conflicting with each other, those skilled in the art can incite somebody to action
The feature of different embodiments or examples and different embodiments or examples described in this specification is combined.
The foregoing is merely presently preferred embodiments of the present invention, is not intended to limit the invention, it is all in spirit of the invention and
Within principle, any modification, equivalent replacement, improvement and so on be should all be included in the protection scope of the present invention.
Claims (10)
1. a kind of VOCs waste gas recovery processing unit characterized by comprising
Pipeline is adsorbed, the absorber in the absorption pipeline carries out adsorption treatment to exhaust gas, and gas is discharged by treated；
Nitrogen charging circulation line, when the absorber is filled with nitrogen, the nitrogen charging circulation line provides circulated air；
Nitrogen discharge pipeline, the nitrogen discharge pipeline are used to be exhausted when pressure is more than designated value in the absorber,
It discharges the pressure in the absorber and comes out the replacement of oxygen in absorber and nitrogen charging circulation line；Through the nitrogen discharge
The exhaust gas of pipeline discharge is again introduced into absorber and carries out adsorption treatment；
Pipeline is heated, the heating pipeline heats nitrogen in the absorber being desorbed；Hot nitrogen is to suction
The VOCs invested in the absorber is desorbed；
The VOCs that the absorber is desorbed out is condensed back to by condensing recovery circulation line, the condensing recovery circulation line
It receives；
Cooling line, the cooling line cool down the absorber for completing desorption；
Self-loopa is realized by circulating fan respectively in the nitrogen charging circulation line and condensing recovery circulation line.
2. a kind of VOCs waste gas recovery processing unit according to claim 1, which is characterized in that including condenser and gas-liquid point
From device,
The absorber and the circulating fan constitute the nitrogen charging circulation line by piping connection；
The absorber, the condenser, the gas-liquid separator and the circulating fan described in pipeline composition by being condensed back to
Receive circulation line；
It is equipped with inside the absorber outside heat exchange coil and/or the absorber and heat exchange jacket is installed, the heat exchange plate
It is passed through water vapour in pipe and/or the heat exchange jacket and constitutes the heating pipeline；
It is passed through recirculated water in the heat exchange coil and/or the heat exchange jacket and constitutes the cooling line.
3. a kind of VOCs waste gas recovery processing unit according to claim 2, which is characterized in that the absorption pipeline further includes
Main air blower and pretreatment unit, the pretreatment unit is used to carry out cooling down to exhaust gas and filtration treatment, the pretreatment unit,
The main air blower and for exhaust gas carry out adsorption treatment absorber pass sequentially through piping connection；Exhaust gas after adsorption treatment from
The absorber discharge.
4. a kind of VOCs waste gas recovery processing unit according to claim 3, which is characterized in that further include urgent cooling pipe
Road, the urgent cooling pipeline is for carrying out cooling processing when the absorber temperature anomaly.
5. a kind of VOCs waste gas recovery processing unit according to claim 4, which is characterized in that the absorber is equipped with useless
Gas import, waste gas outlet, circulation wind inlet, circulated air outlet, nitrogen inlet, water inlet, discharge outlet, and be correspondingly provided with exhaust gas into
Mouth valve, waste gas outlet valve, circulated air inlet valve, circulated air outlet valve, nitrogen inlet valve, water inlet valve, scupper valve；It is described pre-
The air inlet of the gas outlet of processing unit and the main air blower passes through piping connection, the gas outlet of the main air blower and the exhaust gas
Import is connected by gas inlet pipeline；The air outlet of the circulation wind inlet and the circulating fan passes through piping connection；
The circulated air that the condenser and the gas-liquid separator are successively set on the absorber exports and the circulating fan
Air inlet between pipeline on；And the condenser and gas-liquid separator parallel connection one condense bypass line, the condensation
The air inlet of device, it is described condensation bypass line, the gas-liquid separator gas outlet be respectively equipped with condenser valve, condensation bypass pipe
Road valve, gas-liquid separator valve；
The urgent cooling pipeline includes water inlet pipe and drainpipe, and the water inlet pipe is connect with the water inlet, the drainpipe
It is connect with the discharge outlet；
The air outlet of circulating fan described in the nitrogen discharge piping connection and the air inlet of the main air blower and nitrogen row
Pipeline is put equipped with nitrogen discharge valve；
The heat exchange coil and/or the heat exchange jacket are equipped with steam inlet, steam condensate (SC) outlet, circulating water intake, circulation
Water out, and it is correspondingly provided with steam inlet valve, steam condensate (SC) outlet valve, circulating water intake valve, circulating water outlet valve；
Wherein, the absorber is to be arranged in parallel multiple, and multiple absorbers can alternately work.
6. a kind of VOCs waste gas recovery processing method, which comprises the following steps:
S1: absorption: exhaust gas enters absorber and carries out adsorption treatment, until adsorbent bed penetrates, discharge exhaust gas reaches a certain concentration；
S2: nitrogen charging: carrying out nitrogen charging to the absorber that need to be desorbed, and by circulating fan offer circulated air, during nitrogen charging, works as suction
Pressure in adnexa is greater than 5-10KPa, is vented by nitrogen discharge pipeline, discharges the pressure in absorber, and by absorber and
Replacement of oxygen in nitrogen charging circulation line, which comes out, makes oxygen content drop to 0.1-5% or less；Wherein, through the nitrogen discharge tubes rows
Exhaust gas out is again introduced into absorber and carries out adsorption treatment；
S3: heating: nitrogen in the absorber that need to be desorbed is heated by heating pipeline, is heated in the absorber
Temperature reaches 100-140 DEG C, and the absorber is desorbed in hot nitrogen；
S4: condensing recovery: circulated air passes through the absorber and is mixed to get the gaseous mixture containing VOCs with the VOCs being desorbed out, right
VOCs in the gaseous mixture condense and separated and recovered with gas-liquid separator；
S5: cooling: after condensing recovery 0.2-4 hours, cooling drop being carried out to the absorber for completing desorption by cooling line
Temperature.
7. a kind of VOCs waste gas recovery processing method according to claim 6, which is characterized in that the step S1 further includes pre-
Processing, the exhaust gas containing VOCs is pre-processed: the temperature of exhaust gas is adjusted to 0-40 DEG C, and exhaust gas is passed through acid-base neutralization tune
It is whole to filter the dust in exhaust gas to neutrality, so that dust content is less than 5ppm, removes the moisture in removing exhaust gas, make exhaust gas water content not
Greater than 50%；Enter absorber by pretreated exhaust gas and carries out adsorption treatment.
8. a kind of VOCs waste gas recovery processing method according to claim 6, which is characterized in that described in the step S3
Water vapour is passed through in heat exchange coil and/or the heat exchange jacket to heat the absorber；
Recirculated water is passed through into the heat exchange coil and/or the heat exchange jacket in the step S4 to add the absorber
Heat.
9. a kind of VOCs waste gas recovery processing method according to claim 6, which is characterized in that it further include promptly cooling down,
The absorber temperature is when in an abnormal state promptly to cool down to the absorber.
10. a kind of VOCs waste gas recovery processing method according to claim 6, which is characterized in that exhaust gas in the step S1
Adsorption treatment is carried out into one or several absorbers, adsorbent bed penetrates, and discharge exhaust gas is switched to parallel connection after reaching a certain concentration
Other one or several absorbers absorption.
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Application publication date: 20181221 |