CN114570156A - Adsorption treatment system for organic waste gas containing polar components - Google Patents
Adsorption treatment system for organic waste gas containing polar components Download PDFInfo
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- CN114570156A CN114570156A CN202210144282.7A CN202210144282A CN114570156A CN 114570156 A CN114570156 A CN 114570156A CN 202210144282 A CN202210144282 A CN 202210144282A CN 114570156 A CN114570156 A CN 114570156A
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- 238000001179 sorption measurement Methods 0.000 title claims abstract description 445
- 239000007789 gas Substances 0.000 title claims abstract description 179
- 239000010815 organic waste Substances 0.000 title claims abstract description 69
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 95
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims abstract description 42
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 32
- 239000002808 molecular sieve Substances 0.000 claims abstract description 32
- URGAHOPLAPQHLN-UHFFFAOYSA-N sodium aluminosilicate Chemical compound [Na+].[Al+3].[O-][Si]([O-])=O.[O-][Si]([O-])=O URGAHOPLAPQHLN-UHFFFAOYSA-N 0.000 claims abstract description 32
- 229910052759 nickel Inorganic materials 0.000 claims abstract description 21
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 claims abstract description 19
- 238000003795 desorption Methods 0.000 claims description 112
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 26
- 238000000034 method Methods 0.000 claims description 23
- 238000002485 combustion reaction Methods 0.000 claims description 21
- 239000003463 adsorbent Substances 0.000 claims description 11
- 229910001873 dinitrogen Inorganic materials 0.000 claims description 10
- 238000004891 communication Methods 0.000 claims description 8
- 238000010828 elution Methods 0.000 claims description 7
- 229920006395 saturated elastomer Polymers 0.000 claims description 4
- 230000002349 favourable effect Effects 0.000 claims description 3
- 239000011733 molybdenum Substances 0.000 abstract description 9
- 229910052750 molybdenum Inorganic materials 0.000 abstract description 9
- 239000000126 substance Substances 0.000 abstract description 4
- 239000012855 volatile organic compound Substances 0.000 description 21
- 239000000203 mixture Chemical class 0.000 description 15
- 239000000463 material Substances 0.000 description 12
- 238000007084 catalytic combustion reaction Methods 0.000 description 11
- 230000000694 effects Effects 0.000 description 10
- 150000003839 salts Chemical class 0.000 description 9
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 description 8
- 229910052757 nitrogen Inorganic materials 0.000 description 8
- 238000005516 engineering process Methods 0.000 description 7
- 229910052751 metal Inorganic materials 0.000 description 5
- 239000002184 metal Substances 0.000 description 5
- 230000003197 catalytic effect Effects 0.000 description 4
- 230000006378 damage Effects 0.000 description 4
- 238000005470 impregnation Methods 0.000 description 4
- 238000012545 processing Methods 0.000 description 4
- 238000010926 purge Methods 0.000 description 4
- 238000010532 solid phase synthesis reaction Methods 0.000 description 4
- UHOVQNZJYSORNB-UHFFFAOYSA-N Benzene Chemical compound C1=CC=CC=C1 UHOVQNZJYSORNB-UHFFFAOYSA-N 0.000 description 3
- XEKOWRVHYACXOJ-UHFFFAOYSA-N Ethyl acetate Chemical compound CCOC(C)=O XEKOWRVHYACXOJ-UHFFFAOYSA-N 0.000 description 3
- 238000001816 cooling Methods 0.000 description 3
- 238000001514 detection method Methods 0.000 description 3
- 238000011084 recovery Methods 0.000 description 3
- 230000008929 regeneration Effects 0.000 description 3
- 238000011069 regeneration method Methods 0.000 description 3
- 229910021586 Nickel(II) chloride Inorganic materials 0.000 description 2
- MQRWBMAEBQOWAF-UHFFFAOYSA-N acetic acid;nickel Chemical compound [Ni].CC(O)=O.CC(O)=O MQRWBMAEBQOWAF-UHFFFAOYSA-N 0.000 description 2
- APUPEJJSWDHEBO-UHFFFAOYSA-P ammonium molybdate Chemical compound [NH4+].[NH4+].[O-][Mo]([O-])(=O)=O APUPEJJSWDHEBO-UHFFFAOYSA-P 0.000 description 2
- 229940010552 ammonium molybdate Drugs 0.000 description 2
- 235000018660 ammonium molybdate Nutrition 0.000 description 2
- 239000011609 ammonium molybdate Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 2
- NEHMKBQYUWJMIP-UHFFFAOYSA-N chloromethane Chemical compound ClC NEHMKBQYUWJMIP-UHFFFAOYSA-N 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000001035 drying Methods 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 239000004615 ingredient Substances 0.000 description 2
- 238000002715 modification method Methods 0.000 description 2
- 229940078494 nickel acetate Drugs 0.000 description 2
- QMMRZOWCJAIUJA-UHFFFAOYSA-L nickel dichloride Chemical compound Cl[Ni]Cl QMMRZOWCJAIUJA-UHFFFAOYSA-L 0.000 description 2
- KBJMLQFLOWQJNF-UHFFFAOYSA-N nickel(ii) nitrate Chemical compound [Ni+2].[O-][N+]([O-])=O.[O-][N+]([O-])=O KBJMLQFLOWQJNF-UHFFFAOYSA-N 0.000 description 2
- 230000003647 oxidation Effects 0.000 description 2
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- 238000000746 purification Methods 0.000 description 2
- 150000003384 small molecules Chemical class 0.000 description 2
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- KMWBBMXGHHLDKL-UHFFFAOYSA-N [AlH3].[Si] Chemical class [AlH3].[Si] KMWBBMXGHHLDKL-UHFFFAOYSA-N 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 239000000443 aerosol Substances 0.000 description 1
- 238000003915 air pollution Methods 0.000 description 1
- 230000000593 degrading effect Effects 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 150000002148 esters Chemical class 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000002149 hierarchical pore Substances 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 239000002440 industrial waste Substances 0.000 description 1
- 239000011261 inert gas Substances 0.000 description 1
- 150000002576 ketones Chemical class 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 229940050176 methyl chloride Drugs 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
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- 238000007146 photocatalysis Methods 0.000 description 1
- 230000001699 photocatalysis Effects 0.000 description 1
- 238000006552 photochemical reaction Methods 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 238000002336 sorption--desorption measurement Methods 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
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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
- B01D53/0407—Constructional details of adsorbing systems
-
- 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
-
- 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
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
- Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
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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)
- Separation Of Gases By Adsorption (AREA)
Abstract
The invention relates to an adsorption treatment system for organic waste gas containing polar components, which comprises: a nonpolar component adsorption bed, a water vapor adsorption bed and a polar component adsorption bed; wherein the nonpolar component adsorption bed is filled with granular or honeycomb activated carbon; spherical molecular sieves are filled in the water vapor adsorption beds; a ZSM molecular sieve modified by nickel or molybdenum is filled in the polar component adsorption bed; the nonpolar component adsorption bed, the water vapor adsorption bed and the polar component adsorption bed are sequentially arranged according to the flow direction of the organic waste gas, so that the nonpolar component in the organic waste gas is firstly adsorbed and fixed by the nonpolar component adsorption bed, is then absorbed and dried by the water vapor adsorption bed, and finally the polar component in the organic waste gas is adsorbed and fixed by the polar component adsorption bed. The adsorption treatment system provided by the invention is used for treating the organic waste gas with large air quantity and low concentration and containing polar components, and can realize efficient and stable adsorption and standard emission of polar small molecular substances.
Description
Technical Field
The invention relates to the technical field of industrial waste gas treatment, in particular to an adsorption treatment system and method for organic waste gas containing polar components.
Background
The large amount of organic waste gas discharged in industrial production is PM2.5 and O3The aerosol generated by photochemical reaction is also an important component of PM10, and the existence of Volatile Organic Compounds (VOCs) seriously affects human health and environmental pollution. Relevant laws for preventing and controlling air pollution are issued successively for the emission of the VOCs in various countries to control the emission of the VOCs, strict emission limiting measures are set in various parts of China, the prevention and the control of the VOCs are widely regarded by various social circles, and the treatment method is continuously researched and practiced. Widely used terminal technologies for processing VOCs include destruction technologies and recovery technologies. For the treatment of large-air-volume low-concentration VOCs, whether a destruction technology or a recovery technology is adopted, adsorption concentration is a key pretreatment process. Wherein, the adsorption concentration effect is the key for determining whether the technology can be successfully applied. The adsorption method is a method for separating and enriching VOCs from a gas phase by using an adsorbing material with large specific surface area, and the adsorption performance of the adsorbent is the core of the adsorption technology. The activated carbon has wide sources, low cost, rich hierarchical pore structures and large specific surface area, has good adsorption effect on most VOCs such as benzene, esters and ketones, and is a common adsorption material in the industry at present.
However, when polar components such as methanol and methyl chloride exist in the organic waste gas, the non-polar surface of the activated carbon has weak ability to adsorb polar molecules, and the activated carbon can only be applied to occasions with small air volume, and the organic waste gas containing the polar components with large air volume and low concentration is difficult to reach the standard and discharge. Some solutions have been proposed for this purpose by the relevant researchers. For example, a utility model CN205613245U is proposed by zhang et al, which relates to a chemical organic waste gas treatment device, which uses activated carbon as adsorbent, but can only be used in a small air volume position such as a storage tank top breather valve. A utility model patent proposal CN208449008U, which relates to a combined organic waste gas purification and recovery device, and adopts the combined modes of spray washing, biological purification, activated carbon adsorption and photocatalysis to remove short-chain polar organic molecules, and the related procedures are various and the flow and control are complicated. In 2021, high dawn et al proposed an invention patent application CN202111471440.1, which relates to a polar organic waste gas adsorbent, and the adsorption problem of polar small molecules was well solved by using a modified silicon-aluminum molecular sieve. However, when polar components, nonpolar components and water vapor coexist in the organic waste gas, the nonpolar components and the water vapor can adversely affect the polar component adsorbent, so that the adsorption effect of the system on polar small molecules is not ideal.
Disclosure of Invention
Technical problem to be solved
In view of the above disadvantages and shortcomings of the prior art, the present invention provides an adsorption treatment system for organic waste gas containing polar components, which is a set of reasonable adsorption treatment system specially established for organic waste gas containing polar components with large air volume and low concentration, and can realize efficient and stable adsorption and standard discharge of polar small molecular substances when treating organic waste gas containing polar components with large air volume and low concentration.
(II) technical scheme
In order to achieve the purpose, the invention adopts the main technical scheme that:
in a first aspect, the present invention provides an adsorption treatment system for organic waste gas containing polar components, comprising: a nonpolar component adsorption bed, a water vapor adsorption bed and a polar component adsorption bed; wherein the nonpolar component adsorption bed is filled with granular or honeycomb activated carbon; spherical molecular sieves are filled in the water vapor adsorption beds; a ZSM molecular sieve modified by nickel or molybdenum is filled in the polar component adsorption bed;
the nonpolar component adsorption bed, the water vapor adsorption bed and the polar component adsorption bed are sequentially arranged according to the flow direction of the organic waste gas, so that the nonpolar component in the organic waste gas is firstly adsorbed and fixed by the nonpolar component adsorption bed, then is absorbed and dried by the water vapor adsorption bed, and finally the polar component in the organic waste gas is adsorbed and fixed by the polar component adsorption bed.
According to the preferred embodiment of the present invention, the spherical molecular sieve in the water vapor adsorption bed is one of spherical 3A, 4A, 5A and 13X molecular sieves; the ZSM molecular sieve in the polar component adsorption bed is any one of ZSM-4, ZSM-5, ZSM-12 and ZSM-20.
Experiments show that the ZSM molecular sieve modified by nickel or molybdenum has a particularly remarkable adsorption effect on polar small molecular organic matters such as methanol, and the adsorption rate is at least over 99.0%.
According to the preferred embodiment of the invention, the modification method of the nickel or molybdenum metal modified ZSM series molecular sieve comprises an impregnation method and a solid phase method; the impregnation method comprises the steps of impregnating the ZSM molecular sieve into nickel or molybdenum water-soluble salt, separating the molecular sieve, and carrying out aerobic roasting to obtain the nickel or molybdenum metal modified ZSM molecular sieve; the solid phase method is to ball mill and crush the oxides or metal salts of nickel or molybdenum, and mix and roast the crushed oxides or metal salts with the molecular sieve to obtain the ZSM molecular sieve modified by nickel or molybdenum metal. Ammonium molybdate can be used as the molybdenum water-soluble salt, and nickel acetate, nickel chloride, nickel nitrate, etc. can be used as the nickel water-soluble salt.
According to a preferred embodiment of the present invention, the nonpolar component adsorption bed, the water vapor adsorption bed and the polar component adsorption bed are provided with a first end and a second end, respectively; the first end of the nonpolar component adsorption bed is connected with the organic waste gas, and the second end of the nonpolar component adsorption bed is connected with the first end of the water vapor adsorption bed; the second end of the water vapor adsorption bed is connected with the first end of the polar component adsorption bed; and the second end of the polar component adsorption bed is connected with a fan, and the fan is connected with a chimney.
According to the preferred embodiment of the present invention, the first end of the non-polar component adsorption bed is provided with a first adsorption air inlet valve through which the organic offgas is connected; at least one communicating valve is arranged between the second end of the nonpolar component adsorption bed and the first end of the water vapor adsorption bed; at least one communicating valve is arranged between the second end of the water vapor adsorption bed and the first end of the polar component adsorption bed; at least one communicating valve is arranged between the second end of the polar component adsorption bed and the fan.
According to the preferred embodiment of the present invention, the first end of the non-polar component adsorption bed is provided with a first adsorption gas inlet valve, and the second end is provided with a first adsorption gas outlet valve; a second adsorption air inlet valve is arranged at the first end of the water vapor adsorption bed, and a second adsorption air outlet valve is arranged at the second end of the water vapor adsorption bed; the first end of the polar component adsorption bed is provided with a third adsorption air inlet valve, and the second end of the polar component adsorption bed is provided with a third adsorption air outlet valve; the first end of the nonpolar component adsorption bed is communicated with the organic waste gas through a first adsorption air inlet valve, and the second end of the nonpolar component adsorption bed is communicated with the first end of the water vapor adsorption bed through a first adsorption air outlet valve and a second adsorption air inlet valve; the second end of the water vapor adsorption bed is communicated with the first end of the polar component adsorption bed through a second adsorption gas outlet valve and a third adsorption gas inlet valve; and the second end of the polar component adsorption bed is communicated with the fan through a third adsorption gas outlet valve.
According to the preferred embodiment of the present invention, the flow space velocity of the organic waste gas in the nonpolar component adsorption bed, the water vapor adsorption bed and the polar component adsorption bed is 5000--1。
According to a preferred embodiment of the present invention, the adsorption treatment system further comprises a desorption system; the desorption system comprises a desorption medium supply end and a desorption gas treatment end; the adsorption medium supply end is connected with one end (preferably but not limited to the second end) of the nonpolar component adsorption bed, the water vapor adsorption bed and the polar component adsorption bed through pipelines and independent control valves respectively, and the desorption gas treatment end is connected with the other end (preferably but not limited to the first end) of the nonpolar component adsorption bed, the water vapor adsorption bed and the polar component adsorption bed through pipelines and independent control valves respectively.
According to a preferred embodiment of the present invention, the desorption gas treatment end connection comprises a burner, which combines the waste gas eluted from the non-polar component adsorption bed, the water vapor adsorption bed and the polar component adsorption bed to perform a combustion treatment and generate a tail gas; the desorption medium supply end is connected with a tail gas discharge port of the burner so as to obtain an elution medium with a certain initial temperature (250-280 ℃) and is also connected with a nitrogen gas source; the combustion tail gas and the nitrogen gas source which are connected with the desorption medium supply end can be switched.
Preferably, the flow space velocity of the combustion tail gas/nitrogen in the nonpolar component adsorption bed, the water vapor adsorption bed and the polar component adsorption bed is 500-1000h-1。
According to a preferred embodiment of the invention, the desorption medium supply end is connected with a main pipeline, and a flame arrester is arranged on the main pipeline close to the desorption medium supply end; the main pipeline is respectively connected with the second ends of the nonpolar component adsorption bed, the water vapor adsorption bed and the polar component adsorption bed through a plurality of branch pipes and independent control valves arranged on the branch pipes; wherein a cooler is arranged on a branch pipe connected with the nonpolar component adsorption bed. Preferably, the cooler is an air cooler, the temperature of the combustion tail gas at the temperature of 250-280 ℃ is reduced to 80-120 ℃, and the phenomenon that the temperature of the combustion tail gas entering the nonpolar component adsorption bed is too high to cause oxidation and even combustion of the activated carbon filled in the nonpolar component adsorption bed is avoided.
According to a preferred embodiment of the present invention, the chimney and the desorption gas treatment end are both provided with a gas component detector; the gas component detector is connected with a control center, and the control center controls and connects the adsorption air inlet valves and the adsorption air outlet valves at two ends of the nonpolar component adsorption bed, the water vapor adsorption bed and the polar component adsorption bed and the valves of the desorption system through signals;
when the adsorption treatment system starts to work, the control center controls the communication of the adsorption air inlet valves and the adsorption air outlet valves at the two ends of the nonpolar component adsorption bed, the water vapor adsorption bed and the polar component adsorption bed, and the valves of the desorption system are closed; at the moment, the organic waste gas flows through the nonpolar component adsorption bed, the water vapor adsorption bed and the polar component adsorption bed in sequence, and the tail gas enters a chimney; when a gas component detector arranged in the chimney detects that the tail gas does not reach the standard, the chimney indicates that at least one of the nonpolar component adsorption bed, the water vapor adsorption bed and the polar component adsorption bed is saturated in adsorption and needs to be subjected to desorption treatment, and at the moment, the control center controls the adsorption beds at the two ends of the nonpolar component adsorption bed, the water vapor adsorption bed and the polar component adsorption bedThe gas inlet valve and the adsorption gas outlet valves are closed, meanwhile, the valves of the desorption system are communicated, gas with higher initial temperature is supplied to the nonpolar component adsorption bed, the water vapor adsorption bed and the polar component adsorption bed from the desorption medium supply end for elution treatment, and the eluted gas enters a combustor at the desorption gas treatment end for combustion and generates combustion tail gas; when the gas component detector in the desorption gas treatment end detects that the VOC concentration is lower than the preset value (for example, the VOC concentration is less than 50 mg/m)3) And when the elution of each adsorption bed is finished, the control center controls the desorption medium supply end to be switched to a nitrogen gas source, the nitrogen gas source is used for purging and cooling the nonpolar component adsorption bed, the water vapor adsorption bed and the polar component adsorption bed to room temperature, then the valves of the desorption system are controlled to be closed, meanwhile, the adsorption air inlet valves and the adsorption air outlet valves at the two ends of the nonpolar component adsorption bed, the water vapor adsorption bed and the polar component adsorption bed are communicated, and the organic waste gas is adsorbed again.
According to a preferred embodiment of the present invention, the nonpolar component adsorption bed, the water vapor adsorption bed and the polar component adsorption bed are respectively provided with a temperature control device to ensure that the organic waste gas (nonpolar component, moisture and polar component) is at the most favorable adsorption temperature during the adsorption process. Preferably from 30 to 50 ℃.
The control center can control the communication or closing state of each valve, and can adjust the opening of each valve, the working power of the fan and the like according to the gas composition monitored by the gas composition detector in real time so as to adjust the air flow airspeed; meanwhile, the control center can also adjust the adsorption temperature of each adsorption bed according to the gas composition monitored by the gas composition detector in real time, so that the VOC in the organic waste gas is adsorbed and fixed to the maximum extent in each adsorption bed at the most appropriate airspeed and gas residence time in cooperation with the most appropriate adsorption temperature, enrichment and concentration are achieved, and the concentrated combustion/catalytic combustion treatment is facilitated.
According to a preferred embodiment of the present invention, the non-polar component adsorption bed, the water vapor adsorption bed and the polar component adsorption bed may be in the form of a tower body or a tank body, which is integrally closed, and the interior of which is uniformly filled with an adsorption medium, and both ends of which are respectively provided with a pipe connection portion. Preferably, the upper end of the tower body or the tank body is a first end, and the lower end of the tower body or the tank body is a second end; thus, the adsorption process is realized by adsorption from top to bottom in each adsorption bed body, and the desorption process is realized by elution from bottom to top.
According to the preferred embodiment of the present invention, the number of the nonpolar component adsorption beds, the water vapor adsorption beds and the polar component adsorption beds is 2 or more than 2, and the control center controls the 2 or more than 2 nonpolar component adsorption beds, the water vapor adsorption beds and the polar component adsorption beds to alternately perform adsorption and desorption (regeneration), so as to realize the relay continuous adsorption operation of the organic waste gas.
In a second aspect, the present invention provides a method for adsorption treatment of organic waste gas containing polar components, which is implemented by using the adsorption treatment system according to any one of the above embodiments.
(III) advantageous effects
The invention has the beneficial effects that:
the invention mainly aims at establishing a set of reasonable adsorption treatment system for the organic waste gas with large air quantity and low concentration containing polar components, respectively treating the nonpolar components, the water vapor and the polar components by adopting different adsorbent beds (filled with adsorbents with different properties) according to the adsorption treatment system and the method for the organic waste gas with the polar components, and removing most of the nonpolar components and the water vapor by adopting a proper adsorption material before the organic waste gas enters the polar component adsorption bed, so that the treatment efficiency and the treatment effect of the organic waste gas (especially the polar components) are greatly improved, and the polar components which are difficult to remove by a conventional means can be ensured to reach the standard and be discharged.
Further, the invention also comprises a desorption system. When the tail gas output by the adsorption bed is monitored to be not up to the standard (the tail gas still contains non-polar, water or polar small molecular VOC which exceeds the standard), the adsorption bed is indicated to be in a saturated state and needs to be regenerated. At this time, the adsorption mode is switched to the desorption mode, that is: the adsorption air inlet valve and the adsorption air outlet valve at the two ends of each adsorption bed are closed, each valve of a desorption system and a (catalytic) burner are opened, desorption media (tail gas generated by the burner) with certain initial temperature are introduced into each adsorption bed from a desorption media supply end, the effect of desorbing VOC in each adsorption bed is achieved (the effect of heating, evaporating and drying the water vapor adsorption bed), generated desorption gas is uniformly collected to the burner at a desorption gas treatment end for catalytic combustion, the effect of degrading VOC is achieved, and organic waste gas containing polar components is harmless. The tail gas generated by the combustion of the desorption gas treatment end is introduced to the desorption medium supply end to be used as the desorption medium, the initial temperature can reach 250-280 ℃, and the energy required by the temperature rise desorption (the desorption needs higher temperature) of the cold medium is saved. In order to control the safe production, a flame arrester is arranged near the desorption medium supply end. In order to avoid the phenomenon that the desorption medium entering the nonpolar component adsorption bed (active carbon) is too high in temperature to cause the oxidation of the active carbon, a cooler (such as an air cooler for exchanging with air and reducing the temperature) is arranged between the desorption medium and the nonpolar component adsorption bed, and the temperature of the desorption medium is reduced to 80-120 ℃.
The system is further provided with a control center and gas component detectors arranged near the chimney and the desorption gas treatment end, wherein the control center is in communication connection with the gas component detectors, and is also in communication connection with valves of the system, temperature control devices of adsorption beds, a fan, a burner, the induced air speed (the speed of introducing tail gas) of the desorption gas supply end, nitrogen of the desorption gas supply end, a tail gas switching valve and the like.
According to the invention, the adsorption material of the adsorption bed can be flexibly filled according to the composition condition of the organic waste gas, so that the adaptability of the system is improved; when a plurality of groups of nonpolar component adsorption beds, water adsorption beds and polar component adsorption beds are connected in parallel for operation, wherein the desorption gas treatment ends of the plurality of groups of adsorption beds can be connected to the same burner, and different groups of adsorption beds can be alternately adsorbed, desorbed and regenerated, so that the relay type continuous adsorption, fixation, enrichment and combustion operation of organic waste gas is realized, the treatment efficiency of the organic waste gas is improved, and the equipment damage caused by the repeated start and stop of the burner is avoided.
Drawings
Fig. 1 is a schematic view of an adsorption treatment system for organic waste gas containing polar components according to the present invention.
Fig. 2 is a control diagram of the adsorption treatment system for organic waste gas containing polar components according to the present invention.
Description of the drawings:
symbols 8-13 are for each valve in adsorption mode, respectively: a first adsorption air inlet valve 8, a first adsorption air outlet valve 9, a second adsorption air inlet valve 10, a second adsorption air outlet valve 11, a third adsorption air inlet valve 12 and a third adsorption air outlet valve 13; the symbols 14 to 19 indicate respective valves in the desorption mode.
4 is the fan, 5 is the chimney, 6 is the spark arrester, 7 is the air cooler, 20 is the gas composition detector of desorption gas processing end department, 21 is the gas composition detector of the tail gas that gets into the chimney, 22 is control center, 23 is desorption medium supply end, 231 is catalytic combustion tail gas input, 232 is nitrogen gas source input, 24 is desorption gas processing end, 241 is catalytic combustor.
Detailed Description
For the purpose of better explaining the present invention and to facilitate understanding, the present invention will be described in detail by way of specific embodiments with reference to the accompanying drawings.
As shown in fig. 1, a schematic diagram of an organic waste gas adsorption treatment system according to a preferred embodiment of the present invention includes a nonpolar component adsorption bed 1, a water vapor adsorption bed 2, a polar component adsorption bed 3, a fan 4, a chimney 5, a flame arrester 6, an air cooler 7, valve banks 8-13 of the adsorption system and valve banks 14-19 of the desorption system, a desorption medium supply port 23, an adsorbed gas treatment port 24, gas component detectors 20(21), and a control center 22, and a plurality of pipes. The pipeline includes: a connecting pipeline among the nonpolar component adsorption bed 1, the water vapor adsorption bed 2 and the polar component adsorption bed 3, a connecting pipeline between the desorption medium supply end 23 and each adsorption bed, a connecting pipeline between each adsorption bed and the adsorption gas treatment end 24, a tail gas pipeline from the adsorption gas treatment end 24 to the desorption medium supply end 23, a pipeline for organic waste gas to enter the nonpolar component adsorption bed 1, and the like.
Wherein the adsorbing material used by the nonpolar component adsorption bed 1 is one of granular or honeycomb activated carbon, and the adsorbing material used by the water vapor adsorption bed 2 is one of spherical 3A, 4A, 5A and 13X molecular sieves with the diameter of 2-5 mm. The adsorbing material used by the polar component adsorbing bed 3 is one of ZSM-4, ZSM-5, ZSM-12 and ZSM-20 modified by nickel or molybdenum metal.
The modification method of the ZSM molecular sieve modified by nickel or molybdenum metal comprises an impregnation method and a solid phase method; the impregnation method comprises the steps of impregnating the ZSM molecular sieve into nickel or molybdenum water-soluble salt, separating the molecular sieve, and carrying out aerobic roasting to obtain the nickel or molybdenum metal modified ZSM molecular sieve; the solid phase method is that after the oxide or metal salt of nickel or molybdenum is ball milled and crushed, the powder is mixed with a molecular sieve and roasted to obtain the ZSM molecular sieve modified by the nickel or molybdenum metal. Ammonium molybdate can be used as the molybdenum water-soluble salt, and nickel acetate, nickel chloride, nickel nitrate, etc. can be used as the nickel water-soluble salt. The nickel or molybdenum metal modified ZSM-based molecular sieves are also commercially available.
The method for treating the organic waste gas containing the polar components by using the adsorption treatment system comprises two processes of adsorption and desorption. When the adsorption process begins, closing each valve in the desorption valve groups 14-19 in the desorption pipeline, opening each valve in the adsorption valve groups 8-13 in the adsorption pipeline, and keeping the pressure in the adsorption pipeline at 5000-10000h-1The organic waste gas containing polar components sequentially passes through a nonpolar component adsorption bed 1, a water vapor adsorption bed 2, a polar component adsorption bed 3, a fan 4 and a chimney 5 at the space velocity of (2). And (4) discharging after the detection reaches the standard, and if the detection does not reach the standard, indicating that the adsorption bed is saturated, switching to a desorption process. During the adsorption, the temperatures of the nonpolar ingredient adsorption bed 1, the water vapor adsorption bed 2 and the polar ingredient adsorption bed 3 were controlled not to exceed 50 ℃. Wherein, a gas composition detector 21 can be arranged in the chimney 5 or before entering the chimney 5, the gas composition detector 21 is utilized to monitor whether the tail gas entering the chimney 5 meets the requirement in real time, and the gas composition detector 21 is in communication connection with a control center 22. In addition, the nonpolar component adsorption bed 1, the water vapor adsorption bed 2 and the polar component adsorption bed 3 are provided outsideAnd a temperature control device inside or outside, which enables each adsorption bed to adsorb the corresponding component of the organic waste gas under favorable temperature environment.
When the adsorption treatment system does not reach the standard after detection, when the adsorption treatment system enters a desorption mode (carries out desorption regeneration on the adsorption bed), closing each valve in an adsorption valve group 8-13 in an adsorption pipeline, opening each valve in a desorption valve group 14-19 in a desorption pipeline, introducing 250-plus 280 ℃ catalytic combustion tail gas as a desorption medium, respectively entering a nonpolar component adsorption bed 1 and a water vapor adsorption bed 2 from the bottom after passing through a flame arrester 6 (drying an adsorbent in the water vapor adsorption bed 2 by using a hot desorption medium), and entering a polar component adsorption bed from the bottom after the other strand of catalytic combustion tail gas is cooled to 80-120 ℃ by an air cooler 7; the concentrated gas flowing out from the tops of the nonpolar component adsorption bed 1, the water vapor adsorption bed 2 and the polar component adsorption bed 3 is combined and sent to the catalytic combustor 241 for further combustion treatment. A gas component detector 20 is arranged in front of the catalytic burner 241 and used for detecting the total VOC concentration in the desorbed concentrated gas, when the VOC concentration is less than 50mg/m3When the regeneration of the adsorption bed is finished, the desorption operation is stopped, the catalytic combustion tail gas input end 231 is switched to be the nitrogen input 232 at the normal temperature, the nitrogen is introduced into the adsorption bed to blow, cool and reduce the temperature of the nonpolar component adsorption bed 1, the water vapor adsorption bed 2 and the polar component adsorption bed 3 to the normal temperature, and the next round of adsorption operation mode can be quickly adapted after the normal temperature is reached. The desorption medium supplied by the desorption medium supply end 23 comes from combustion tail gas generated by the burner 241 of the desorption gas treatment end 24 burning and concentrating VOC, has a certain initial temperature, can be directly used as the desorption medium, and of course, can also be used for heating an external inert gas source by using heat generated by the burner 241 to perform desorption treatment on the polar component adsorption bed 1, the water vapor adsorption bed 2 and the polar component adsorption bed 3. Wherein the space velocity of the non-polar component adsorption bed 1, the water vapor adsorption bed 2 and the polar component adsorption bed 3 is 500--1。
As shown in fig. 2, the control center 22 can be connected to the gas composition detector 20 near the desorption gas treatment end and the gas composition detector 21 in the chimney 5 in a communication manner, and is also connected to the valves of the adsorption valve groups 8-13, the valves of the desorption valve groups 14-19, the nonpolar component adsorption bed 1, the temperature control devices outside or inside the water vapor adsorption bed 2 and the polar component adsorption bed 3, the driving circuit of the fan 4, the burner 241, the induced draft machine at the desorption gas supply end, the nitrogen and tail gas switching valve at the desorption gas supply end in a communication manner, so that the adsorption mode and the desorption mode can be automatically switched according to the degree of adsorption treatment and the degree of desorption treatment, the space velocity in the adsorption and desorption modes can be automatically adjusted and controlled, the adsorption/desorption temperature of the adsorption bed can be automatically switched, and the nitrogen gas source can be automatically used for cooling and purging the adsorption beds after desorption, in preparation for the re-adsorption operation.
After the technical scheme is adopted, the invention has the beneficial effects that: because the adsorption treatment system and the method for the organic waste gas containing the polar component respectively treat the nonpolar component, the water vapor and the polar component by adopting different adsorbents, the treatment efficiency and the treatment effect are greatly improved, and the polar component which is difficult to remove by a conventional means can be ensured to reach the standard and be discharged; the catalytic combustion tail gas is used as a desorption medium, so that the energy required by the temperature rise desorption of a cold medium (the desorption of the medium requiring higher temperature) is saved; the adsorption materials of the adsorption beds can be flexibly filled according to the composition condition of the organic waste gas, so that the adaptability of the system is improved; when a plurality of sets of nonpolar component adsorption beds, water adsorption beds and polar component adsorption beds are connected in parallel for operation, the desorption gas treatment ends of the plurality of sets of adsorption beds can be connected to the same burner, and different sets of adsorption beds can be alternately adsorbed, desorbed and regenerated, so that the relay type continuous adsorption, fixation, enrichment and combustion operation of the organic waste gas is realized, the treatment efficiency of the organic waste gas is improved, and the equipment damage caused by the repeated start and stop of the burner is avoided.
The following is an example of a specific application of the system for adsorption treatment of organic waste gas according to the present invention.
Example 1
The embodiment provides an adsorption treatment system for organic waste gas containing polar components, which consists of a nonpolar component adsorption bed 1, a water vapor adsorption bed 2, a polar component adsorption bed 3, a fan 4, a chimney 5, a flame arrester 6, an air cooler 7, adsorption valve banks 8-13, desorption valve banks 14-19, an adsorption pipeline, a desorption pipeline and a nitrogen purging pipeline, wherein the adsorption pipeline, the desorption pipeline and the nitrogen purging pipeline are communicated with the equipment. Wherein, the adsorption material used by the nonpolar component adsorption bed 1 is granular activated carbon, the adsorption material used by the water vapor adsorption bed 2 is in a spherical 3A molecular sieve with the diameter of 2mm, and the adsorption material used by the polar component adsorption bed 3 is nickel modified ZSM-5.
Examples 2 to 5
In examples 2 to 5, the same portions as in example 1 except that the polar component adsorption bed 1, the water vapor adsorption bed 2 and the polar component adsorption bed 3 were used with different adsorbing materials, and the tables are shown in Table 1.
Table 1 description of processing system embodiments
| Non-polar component adsorption bed | Water vapor adsorption bed | Polar component adsorption bed | |
| Example 2 | Granular activated carbon | 2mm3A molecular sieve | Molybdenum metal modified ZSM-4 |
| Example 3 | Honeycomb activated carbon | 3mm4A molecular sieve | Nickel metal modified ZSM-12 |
| Example 4 | Honeycomb activated carbon | 4mm5A molecular sieve | Molybdenum metal modified ZSM-5 |
| Example 5 | Honeycomb activated carbon | 5mm13X molecular sieve | Nickel metal modified ZSM-20 |
Example 6
The simulated organic waste gas contains 1000mg/m of ethyl acetate (non-polar component)3Steam of 850mg/m3Methanol (polar component) 1000mg/m3. The organic waste gas was treated by adsorption using the apparatus of example 1. Closing each valve in desorption valve groups 14-19 in the desorption pipeline, opening each valve in adsorption valve groups 8-13 in the adsorption pipeline, and keeping the temperature for 5000h-1The organic waste gas containing polar components sequentially passes through the nonpolar component adsorption bed 1, the water vapor adsorption bed 2, the polar component adsorption bed 3, the fan 4 and the chimney 5 at the airspeed, and after the organic waste gas is adsorbed for 1 hour, the concentration of the nonpolar components at the outlet is measured to be 4mg/m3The concentration of the polar component is 7mg/m3The total VOC concentration is 11mg/m3And the emission requirement is met.
When the desorption process occurs, closing each valve in the adsorption valve groups 8-13 in the adsorption pipeline, opening each valve in the desorption valve groups 14-19 in the desorption pipeline, introducing catalytic combustion tail gas at 250 ℃ as desorption medium, respectively entering the nonpolar component adsorption bed 1 and the water vapor adsorption bed 2 from the bottom after passing through the flame arrester 7, and cooling the other catalytic combustion tail gas to 80 ℃ through the air cooler 8 and then entering the polar component adsorption bed from the bottom; the concentrated gas flowing out from the tops of the nonpolar component adsorption bed 1, the water vapor adsorption bed 2 and the polar component adsorption bed 3 is combined and then sent to a catalytic combustion device for further combustion treatment. The space velocity of the desorption medium passing through the nonpolar component adsorption bed 1, the water vapor adsorption bed 2 and the polar component adsorption bed 3 is500h-1After 5h, the total VOC concentration in the concentrated gas is less than 50mg/m3And (3) after the desorption is finished, switching the catalytic combustion tail gas into normal-temperature nitrogen, and reducing the temperature of the nonpolar component adsorption bed 1, the water vapor adsorption bed 2 and the polar component adsorption bed 3 to normal temperature so as to carry out the next adsorption process.
Examples 7 to 10
In examples 7 to 10, the results are shown in Table 2, with the adsorption systems of examples 2 to 5, the organic waste gas composition being as in example 6, and the specific conditions for adsorption and desorption being changed.
As can be seen from the above table, the total outlet VOC concentration was measured to be 13-20mg/m after 1h of adsorption3And the emission requirement can be met. From examples 6-10, it can be seen that a set of reasonable adsorption treatment system established by the invention for the organic waste gas containing polar components with large air volume and low concentration containing polar components can realize efficient adsorption of polar small molecular substances and stable standard discharge when treating the organic waste gas with large air volume and low concentration containing polar components.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and these modifications or substitutions do not depart from the spirit of the corresponding technical solutions of the embodiments of the present invention.
Claims (10)
1. An adsorption treatment system for organic waste gas containing polar components, comprising: a nonpolar component adsorption bed, a water vapor adsorption bed and a polar component adsorption bed; wherein the nonpolar component adsorption bed is filled with granular or honeycomb activated carbon; a spherical molecular sieve is filled in the water vapor adsorption bed; a ZSM molecular sieve modified by nickel or molybdenum metal is filled in the polar component adsorption bed;
the nonpolar component adsorption bed, the water vapor adsorption bed and the polar component adsorption bed are sequentially arranged according to the flow direction of the organic waste gas, so that the nonpolar component in the organic waste gas is firstly adsorbed and fixed by the nonpolar component adsorption bed, then is absorbed and dried by the water vapor adsorption bed, and finally the polar component in the organic waste gas is adsorbed and fixed by the polar component adsorption bed.
2. The adsorption treatment system of claim 1 wherein the spherical molecular sieve in the water vapor adsorption bed is one of spherical 3A, 4A, 5A, 13X molecular sieves; the ZSM molecular sieve in the polar component adsorption bed is any one of ZSM-4, ZSM-5, ZSM-12 and ZSM-20.
3. The adsorption treatment system of claim 1, wherein the non-polar component adsorbent bed, the water vapor adsorbent bed, and the polar component adsorbent bed are provided with a first end and a second end, respectively; the first end of the nonpolar component adsorption bed is connected with the organic waste gas, and the second end of the nonpolar component adsorption bed is connected with the first end of the water vapor adsorption bed; the second end of the water vapor adsorption bed is connected with the first end of the polar component adsorption bed; and the second end of the polar component adsorption bed is connected with a fan, and the fan is connected with a chimney.
4. The adsorption treatment system of claim 3, wherein the non-polar component adsorption bed is provided at a first end with a first adsorption inlet valve and at a second end with a first adsorption outlet valve; a second adsorption air inlet valve is arranged at the first end of the water vapor adsorption bed, and a second adsorption air outlet valve is arranged at the second end of the water vapor adsorption bed; the first end of the polar component adsorption bed is provided with a third adsorption air inlet valve, and the second end of the polar component adsorption bed is provided with a third adsorption air outlet valve; the first end of the nonpolar component adsorption bed is communicated with the organic waste gas through a first adsorption air inlet valve, and the second end of the nonpolar component adsorption bed is communicated with the first end of the water vapor adsorption bed through a first adsorption air outlet valve and a second adsorption air inlet valve; the second end of the water vapor adsorption bed is communicated with the first end of the polar component adsorption bed through a second adsorption gas outlet valve and a third adsorption gas inlet valve; and the second end of the polar component adsorption bed is communicated with the fan through a third adsorption gas outlet valve.
5. The adsorption treatment system of claim 3 further comprising a desorption system; the desorption system comprises a desorption medium supply end and a desorption gas treatment end; the adsorption medium supply end is connected with one ends of the nonpolar component adsorption bed, the water vapor adsorption bed and the polar component adsorption bed through pipelines and independent control valves respectively, and the desorption gas treatment end is connected with the other ends of the nonpolar component adsorption bed, the water vapor adsorption bed and the polar component adsorption bed through pipelines and independent control valves respectively.
6. The system of claim 5, wherein the desorption gas treatment end connection comprises a burner for combining the off-gas eluted from the non-polar component adsorption bed, the water vapor adsorption bed and the polar component adsorption bed for combustion treatment and generating the off-gas; the desorption medium supply end is connected with a tail gas discharge port of the burner so as to obtain an elution medium with a certain initial temperature, and the desorption medium supply end is also connected with a nitrogen gas source; the combustion tail gas and the nitrogen gas source which are connected with the desorption medium supply end can be switched.
7. The adsorption treatment system of claim 6, wherein the desorption medium supply end is connected with a main pipe, and a flame arrester is arranged on the main pipe and close to the desorption medium supply end; the main pipeline is respectively connected with the second ends of the nonpolar component adsorption bed, the water vapor adsorption bed and the polar component adsorption bed through a plurality of branch pipes and independent control valves arranged on the branch pipes; and a cooler is arranged on a branch pipe connected with the nonpolar component adsorption bed, so that the combustion tail gas is introduced into the nonpolar component adsorption bed after the temperature of the combustion tail gas is reduced.
8. The adsorption treatment system according to claim 5, 6 or 7, wherein the chimney and the desorption gas treatment end are provided with gas component detectors; the gas component detector is connected with a control center, and the control center controls and connects the adsorption air inlet valves and the adsorption air outlet valves at two ends of the nonpolar component adsorption bed, the water vapor adsorption bed and the polar component adsorption bed and the valves of the desorption system through signals;
when the adsorption treatment system starts to work, the control center controls the communication of the adsorption air inlet valves and the adsorption air outlet valves at the two ends of the nonpolar component adsorption bed, the water vapor adsorption bed and the polar component adsorption bed, and the valves of the desorption system are closed; at the moment, the organic waste gas sequentially flows through a nonpolar component adsorption bed, a water vapor adsorption bed and a polar component adsorption bed, and the tail gas enters a chimney;
when a gas component detector arranged in the chimney monitors that the tail gas does not reach the standard, the chimney indicates that at least one of the nonpolar component adsorption bed, the water vapor adsorption bed and the polar component adsorption bed is saturated in adsorption and needs to be subjected to desorption treatment, at the moment, the control center controls the adsorption air inlet valves and the adsorption air outlet valves at the two ends of the nonpolar component adsorption bed, the water vapor adsorption bed and the polar component adsorption bed to be closed and simultaneously the valves of a desorption system to be communicated, gas with higher initial temperature is supplied to the nonpolar component adsorption bed, the water vapor adsorption bed and the polar component adsorption bed from a desorption medium supply end for elution treatment, and the eluted gas enters a combustor at the desorption gas treatment end for combustion and generates combustion tail gas;
when the gas component detector in the desorption gas treatment end detects that the VOC concentration is lower than a preset value, the elution of each adsorption bed is completed, at the moment, the control center controls the desorption medium supply end to be switched to a nitrogen gas source, the nonpolar component adsorption bed, the water vapor adsorption bed and the polar component adsorption bed are blown and cooled to the room temperature by the nitrogen gas source, then, the valves of the desorption system are controlled to be closed, meanwhile, the adsorption air inlet valves and the adsorption air outlet valves at the two ends of the nonpolar component adsorption bed, the water vapor adsorption bed and the polar component adsorption bed are communicated, and the organic waste gas is adsorbed again.
9. The adsorption treatment system of claim 8, wherein the nonpolar component adsorption bed, the water vapor adsorption bed and the polar component adsorption bed are further provided with temperature control devices respectively to ensure that the organic waste gas is at the most favorable adsorption temperature in the adsorption process; the control center can adjust the opening of each valve, the working power of the fan and the adsorption temperatures of the nonpolar component adsorption bed, the water vapor adsorption bed and the polar component adsorption bed.
10. The adsorption treatment system according to claim 5, 6 or 7, wherein the number of the nonpolar component adsorption beds, the water vapor adsorption beds and the polar component adsorption beds is 2 or more, and the control center controls the 2 or more nonpolar component adsorption beds, the water vapor adsorption beds and the polar component adsorption beds to alternately perform adsorption and desorption, thereby realizing relay continuous adsorption operation on the organic waste gas.
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