CN114712986B - VOCs commonplace mill waste gas classification collection and processing system - Google Patents
VOCs commonplace mill waste gas classification collection and processing system Download PDFInfo
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- CN114712986B CN114712986B CN202210478967.5A CN202210478967A CN114712986B CN 114712986 B CN114712986 B CN 114712986B CN 202210478967 A CN202210478967 A CN 202210478967A CN 114712986 B CN114712986 B CN 114712986B
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- 239000002912 waste gas Substances 0.000 title claims abstract description 109
- 239000012855 volatile organic compound Substances 0.000 title claims abstract description 51
- 238000012545 processing Methods 0.000 title description 2
- 239000007789 gas Substances 0.000 claims abstract description 162
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims abstract description 49
- 238000004519 manufacturing process Methods 0.000 claims abstract description 49
- 238000011282 treatment Methods 0.000 claims abstract description 49
- 239000003546 flue gas Substances 0.000 claims abstract description 42
- 239000003344 environmental pollutant Substances 0.000 claims abstract description 39
- 231100000719 pollutant Toxicity 0.000 claims abstract description 39
- 238000000034 method Methods 0.000 claims abstract description 20
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 claims abstract description 18
- 239000003595 mist Substances 0.000 claims abstract description 16
- 238000000746 purification Methods 0.000 claims abstract description 13
- 229910002091 carbon monoxide Inorganic materials 0.000 claims abstract description 7
- 239000010815 organic waste Substances 0.000 claims description 83
- 238000001179 sorption measurement Methods 0.000 claims description 74
- 239000002360 explosive Substances 0.000 claims description 53
- 230000003197 catalytic effect Effects 0.000 claims description 51
- 238000003795 desorption Methods 0.000 claims description 41
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- 239000003054 catalyst Substances 0.000 claims description 28
- 238000007254 oxidation reaction Methods 0.000 claims description 24
- 238000000926 separation method Methods 0.000 claims description 24
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- 238000006243 chemical reaction Methods 0.000 claims description 21
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 20
- 239000003921 oil Substances 0.000 claims description 16
- 239000006004 Quartz sand Substances 0.000 claims description 14
- 239000010805 inorganic waste Substances 0.000 claims description 14
- 150000001335 aliphatic alkanes Chemical class 0.000 claims description 13
- 239000002808 molecular sieve Substances 0.000 claims description 12
- URGAHOPLAPQHLN-UHFFFAOYSA-N sodium aluminosilicate Chemical compound [Na+].[Al+3].[O-][Si]([O-])=O.[O-][Si]([O-])=O URGAHOPLAPQHLN-UHFFFAOYSA-N 0.000 claims description 12
- 238000005516 engineering process Methods 0.000 claims description 9
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 9
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- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical class [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 6
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- HNPSIPDUKPIQMN-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical compound O=[Si]=O.O=[Al]O[Al]=O HNPSIPDUKPIQMN-UHFFFAOYSA-N 0.000 claims description 5
- 238000010438 heat treatment Methods 0.000 claims description 5
- 229910052710 silicon Inorganic materials 0.000 claims description 5
- 239000010703 silicon Substances 0.000 claims description 5
- 238000003860 storage Methods 0.000 claims description 5
- 238000009423 ventilation Methods 0.000 claims description 5
- 239000010457 zeolite Substances 0.000 claims description 5
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims description 4
- 239000010949 copper Substances 0.000 claims description 4
- 238000005238 degreasing Methods 0.000 claims description 4
- 230000000694 effects Effects 0.000 claims description 4
- 239000004744 fabric Substances 0.000 claims description 4
- DLCOPLYGCSRNAY-UHFFFAOYSA-N molybdenum titanium vanadium Chemical compound [Ti][Mo][V] DLCOPLYGCSRNAY-UHFFFAOYSA-N 0.000 claims description 4
- 229920006395 saturated elastomer Polymers 0.000 claims description 4
- WKXHZKXPFJNBIY-UHFFFAOYSA-N titanium tungsten vanadium Chemical compound [Ti][W][V] WKXHZKXPFJNBIY-UHFFFAOYSA-N 0.000 claims description 4
- 229910052720 vanadium Inorganic materials 0.000 claims description 4
- LEONUFNNVUYDNQ-UHFFFAOYSA-N vanadium atom Chemical compound [V] LEONUFNNVUYDNQ-UHFFFAOYSA-N 0.000 claims description 4
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 3
- 229910052802 copper Inorganic materials 0.000 claims description 3
- 230000007797 corrosion Effects 0.000 claims description 3
- 238000005260 corrosion Methods 0.000 claims description 3
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- 229910052684 Cerium Inorganic materials 0.000 claims description 2
- 229920000742 Cotton Polymers 0.000 claims description 2
- 238000007664 blowing Methods 0.000 claims description 2
- GWXLDORMOJMVQZ-UHFFFAOYSA-N cerium Chemical compound [Ce] GWXLDORMOJMVQZ-UHFFFAOYSA-N 0.000 claims description 2
- 238000001816 cooling Methods 0.000 claims description 2
- 238000004924 electrostatic deposition Methods 0.000 claims description 2
- 238000011049 filling Methods 0.000 claims description 2
- 238000001914 filtration Methods 0.000 claims description 2
- 239000003365 glass fiber Substances 0.000 claims description 2
- 239000007788 liquid Substances 0.000 claims description 2
- JRZJOMJEPLMPRA-UHFFFAOYSA-N olefin Natural products CCCCCCCC=C JRZJOMJEPLMPRA-UHFFFAOYSA-N 0.000 claims description 2
- 239000003973 paint Substances 0.000 claims description 2
- 239000002957 persistent organic pollutant Substances 0.000 claims description 2
- 238000006303 photolysis reaction Methods 0.000 claims description 2
- 230000015843 photosynthesis, light reaction Effects 0.000 claims description 2
- 238000005406 washing Methods 0.000 claims description 2
- 229910001385 heavy metal Inorganic materials 0.000 abstract description 23
- 238000004806 packaging method and process Methods 0.000 abstract description 8
- 238000007639 printing Methods 0.000 abstract description 8
- 230000008569 process Effects 0.000 abstract description 8
- 238000005265 energy consumption Methods 0.000 abstract description 4
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- 150000002894 organic compounds Chemical class 0.000 abstract description 3
- -1 particulate matters Substances 0.000 abstract description 3
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- 231100001261 hazardous Toxicity 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 238000013021 overheating Methods 0.000 description 2
- 239000004215 Carbon black (E152) Substances 0.000 description 1
- 229910021591 Copper(I) chloride Inorganic materials 0.000 description 1
- 239000013148 Cu-BTC MOF Substances 0.000 description 1
- OTMSDBZUPAUEDD-UHFFFAOYSA-N Ethane Chemical compound CC OTMSDBZUPAUEDD-UHFFFAOYSA-N 0.000 description 1
- 229910010413 TiO 2 Inorganic materials 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- HSFWRNGVRCDJHI-UHFFFAOYSA-N alpha-acetylene Natural products C#C HSFWRNGVRCDJHI-UHFFFAOYSA-N 0.000 description 1
- 229960000892 attapulgite Drugs 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000001273 butane Substances 0.000 description 1
- 239000002041 carbon nanotube Substances 0.000 description 1
- 229910021393 carbon nanotube Inorganic materials 0.000 description 1
- 238000007084 catalytic combustion reaction Methods 0.000 description 1
- 238000009841 combustion method Methods 0.000 description 1
- 230000002860 competitive effect Effects 0.000 description 1
- 238000010668 complexation reaction Methods 0.000 description 1
- OXBLHERUFWYNTN-UHFFFAOYSA-M copper(I) chloride Chemical group [Cu]Cl OXBLHERUFWYNTN-UHFFFAOYSA-M 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000004200 deflagration Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
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- 125000002534 ethynyl group Chemical group [H]C#C* 0.000 description 1
- 239000012467 final product Substances 0.000 description 1
- 239000002737 fuel gas Substances 0.000 description 1
- 230000036541 health Effects 0.000 description 1
- 229930195733 hydrocarbon Natural products 0.000 description 1
- 150000002430 hydrocarbons Chemical class 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 125000002496 methyl group Chemical group [H]C([H])([H])* 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- IJDNQMDRQITEOD-UHFFFAOYSA-N n-butane Chemical compound CCCC IJDNQMDRQITEOD-UHFFFAOYSA-N 0.000 description 1
- OFBQJSOFQDEBGM-UHFFFAOYSA-N n-pentane Natural products CCCCC OFBQJSOFQDEBGM-UHFFFAOYSA-N 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 229910052625 palygorskite Inorganic materials 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 230000001902 propagating effect Effects 0.000 description 1
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- 238000006479 redox reaction Methods 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 231100000331 toxic Toxicity 0.000 description 1
- 230000002588 toxic effect Effects 0.000 description 1
- NOSIKKRVQUQXEJ-UHFFFAOYSA-H tricopper;benzene-1,3,5-tricarboxylate Chemical compound [Cu+2].[Cu+2].[Cu+2].[O-]C(=O)C1=CC(C([O-])=O)=CC(C([O-])=O)=C1.[O-]C(=O)C1=CC(C([O-])=O)=CC(C([O-])=O)=C1 NOSIKKRVQUQXEJ-UHFFFAOYSA-H 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
- 239000002351 wastewater Substances 0.000 description 1
- 239000013172 zeolitic imidazolate framework-7 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
- B01D53/02—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
- B01D53/06—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 moving adsorbents, e.g. rotating beds
-
- 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
- B01D53/047—Pressure swing adsorption
-
- 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
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/86—Catalytic processes
- B01D53/8621—Removing nitrogen compounds
- B01D53/8625—Nitrogen oxides
-
- 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
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/86—Catalytic processes
- B01D53/864—Removing carbon monoxide or hydrocarbons
-
- 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
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/86—Catalytic processes
- B01D53/8665—Removing heavy metals or compounds thereof, e.g. mercury
-
- 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
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/86—Catalytic processes
- B01D53/8678—Removing components of undefined structure
- B01D53/8687—Organic components
-
- 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
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/86—Catalytic processes
- B01D53/869—Multiple step processes
-
- 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
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- Analytical Chemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Health & Medical Sciences (AREA)
- Biomedical Technology (AREA)
- Exhaust Gas Treatment By Means Of Catalyst (AREA)
- Treating Waste Gases (AREA)
Abstract
The invention belongs to the technical field of air pollution control, and discloses a VOCs commonplace factory waste gas classification collection and treatment system. The system is designed aiming at the characteristics of multiple types, complex components and wide concentration range of the exhaust gas of the VOCs common factory, and carries out classified collection and classified treatment on volatile organic compounds, volatile malodorous organic compounds, oil mist, particulate matters, nitrogen oxides, carbon monoxide, heavy metals and other pollutants in the production exhaust gas and the boiler flue gas, wherein the purification efficiency of the system is more than 95%. The invention focuses on the pertinence and safety of the treatment process in design, solves the treatment problems of various types, concentrations and multiple rows of waste gas in the VOCs common factories, realizes the efficient purification of various gaseous pollutants, has the advantages of low energy consumption, long service life, no secondary pollution and the like, has the advantages of simplicity, low investment cost, wide application range and the like in investment operation, and is suitable for the waste gas treatment in industrial common factories in industries of industrial coating, packaging printing, furniture manufacturing and the like.
Description
Technical Field
The invention belongs to the technical field of air pollution control, and particularly relates to a VOCs common factory waste gas classification collection and treatment system.
Background
The efficient VOCs treating technology includes direct combustion, adsorption concentration oxidation, catalytic combustion, heat accumulating burning, oxidizing absorption, microbe purifying, etc. VOCs commonplace mill relates to a plurality of process links, and the waste gas of discharging kind is many, the composition is complicated, concentration range is wide, still contains hazardous gas in the waste gas. If the single VOCs treatment technology is adopted to intensively treat the waste gas, the problems of low treatment efficiency, short service life of a treatment system and the like can occur; the adoption of the combined process for centralized treatment of the waste gas can face the problems of high investment cost, high operation and maintenance difficulty, complex operation and the like, and is not beneficial to the operation and popularization of a common factory. The direct combustion method has the advantages of simplicity, high efficiency, long service life and the like, but has the potential safety hazard of inflammability and explosiveness, and is not suitable for waste gas treatment of VOCs common factories. There is a great need to develop a VOCs common factory waste gas treatment system with low energy consumption, high treatment efficiency, high safety and strong economic feasibility, which can solve the pollution treatment problem of various gaseous pollutants in a concentrated way and promote the green development of industry.
Disclosure of Invention
In order to solve the defects and shortcomings of the prior art, the exhaust gas of the VOCs common factory generally comprises boiler exhaust gas and production exhaust gas, and the invention provides a VOCs common factory exhaust gas classification and treatment system aiming at the production characteristics and the exhaust gas emission characteristics of the VOCs common factory. The system is designed aiming at the characteristics of multiple types, complex components and wide concentration range of the waste gas of the common factory, and is used for classifying, collecting and treating pollutants such as Volatile Organic Compounds (VOCs), volatile malodorous organic compounds (MVOCs), oil mist, particulate matters, nitrogen oxides, carbon monoxide, heavy metals and the like in the waste gas of the production and the boiler according to the physical and chemical characteristics of the waste gas, realizing the efficient purification of various gaseous pollutants, and being suitable for the waste gas treatment of the common factory in industries such as industrial coating, packaging printing, furniture manufacturing and the like. The invention adopts the following technical scheme:
the VOCs commonplace factory waste gas classifying, collecting and treating system comprises a waste gas classifying, collecting system and a waste gas treating system; the waste gas classified collection system comprises a collection system, a pretreatment system, a classified adsorption system and a desorption system; the waste gas treatment system comprises a heat exchange device, a dust removal system, a low-temperature catalytic oxidation system and a medium-temperature catalytic system; the specific steps of waste gas classified collection and treatment by the VOCs common factory waste gas classified collection and treatment system are as follows:
(1) The boiler flue gas exchanges heat through a flue to a heat exchange device, the temperature of the flue gas is reduced to 50-100 ℃ after heat exchange, and then the flue gas enters a dust removal system to remove granular pollutants in the flue gas; the flue gas after dust removal enters a medium-temperature catalytic system for treatment, the reaction temperature is 250-350 ℃, and nitrogen oxides and carbon monoxide in the flue gas are removed;
(2) The production waste gas of the VOCs common factory is pretreated by a pretreatment system through a collection system, and oil mist, paint mist, water and granular pollutants in the production waste gas are removed at normal temperature;
(3) The production waste gas is pretreated and enters a classification adsorption system, a pressure swing adsorption separation method is adopted, and a separating agent carries out secondary pressure swing adsorption on inflammable and explosive organic waste gas at normal temperature; then the organic waste gas is dynamically adsorbed by the adsorbent at normal temperature by using an adsorption concentration method, so that classified collection is realized;
(4) After the inflammable and explosive organic waste gas and the organic waste gas are adsorbed and saturated, the production waste gas is sent to a buffer tank for temporary storage, a desorption valve and an inflammable and explosive organic waste gas desorption fan are opened, purging and desorption are carried out at normal temperature, the inflammable and explosive organic waste gas is separated out by a separating agent, and the inflammable and explosive organic waste gas is sent to a low-temperature catalytic oxidation system for treatment at 70-90 ℃ to remove inflammable and explosive organic pollutants in the production waste gas; opening a desorption valve and an organic waste gas desorption fan, blowing and desorbing at 250-350 ℃, heating an adsorbent to separate out high-concentration organic waste gas, and feeding the high-concentration organic waste gas into a boiler through a flame arrester for high-temperature incineration treatment to remove Volatile Organic Compounds (VOCs) and volatile malodorous organic compounds (MVOCs); the rest inorganic waste gas is directly connected to a medium-temperature catalytic system for treatment, so that carbon monoxide and nitrogen oxides in the production waste gas are removed; realizing various waste gas classification treatments;
(5) The treated boiler flue gas and the treated production waste gas are uniformly discharged through a chimney after reaching standards.
The boiler is one of a gas boiler, an oil boiler, a special boiler for burning biomass and a biomass gasification furnace.
The granular pollutants are dust, heavy metals and the like.
The medium-temperature catalytic system in the step (1) and the step (4) comprises a medium-temperature catalyst, quartz sand, a catalytic fixed bed and a heat conducting pipe. Wherein, the medium temperature catalyst is at least one of vanadium-tungsten-titanium, vanadium-molybdenum-titanium and perovskite catalyst; the medium-temperature catalytic system utilizes the heat-conducting pipe to heat the reaction temperature to 250-350 ℃, and the pollutant removal efficiency is more than 97%.
The low-temperature catalytic oxidation system in the step (4) comprises a low-temperature catalyst, quartz sand, a catalytic fixed bed and a heat conduction pipe. Wherein, the low-temperature catalyst is at least one of cerium-based, vanadium-based, copper-based and molecular sieve catalysts. The reaction temperature of the low-temperature catalytic oxidation system is maintained at 70-90 ℃, and the pollutant removal efficiency is up to more than 95%.
And (2) arranging capillary heat conduction pipes in the heat exchange device in the step (1), wherein the capillary heat conduction pipes are perpendicular to the flue gas direction, and after the flue gas (400-500 ℃) exchanges heat, heat is continuously supplied to an organic waste gas desorption fan and a catalytic oxidation system in an oil or steam mode. The heat after heat exchange is directly communicated with the organic waste gas desorption fan and the medium-temperature catalytic system through the heat conducting pipe, so that the temperature of the organic waste gas desorption fan and the medium-temperature catalytic system is kept between 250 ℃ and 350 ℃. The heat is consumed by the medium-temperature catalytic system and then is introduced into the low-temperature catalytic oxidation system, and the temperature is regulated by the cooling fan, so that the reaction temperature of the system is kept between 70 and 90 ℃.
The dust removing system in the step (1) comprises at least one of cloth bag dust removal, cyclone dust removal, electrostatic dust removal, wet electric dust removal and water film dust removal. The dust concentration in the treated flue gas is 10mg/m 3 In the following, the relevant emission standard requirements are fulfilled.
The collecting system in the step (2) comprises collecting facilities such as integral ventilation, a gas collecting hood, a gas suction arm and the like, and waste gas conveying facilities such as a corrosion-resistant gas collecting pipeline, a flue and the like. The waste gas collecting facilities are selected by taking the factors such as production process, operation mode, waste gas discharge mode, waste gas property, treatment method and the like into consideration, and run under negative pressure, so that the collecting efficiency is ensured to be more than 85%. The waste gas conveying facility should be airtight, and fully consider the corrosion characteristic of conveying medium, to high concentration organic waste gas transport, the pipeline needs fully consider antistatic property.
The pretreatment system in the step (2) comprises a pre-degreasing device, a dry filter and a pre-dedusting device. The treatment technology of the pre-degreasing device can adopt at least one of the purification technologies such as filtration adsorption, mechanical separation, electrostatic deposition, wet washing, ultraviolet photolysis and the like; the dry filter achieves the effects of water removal and demisting by filling with a filter material, wherein the filter material can adopt at least one of quartz cotton, a glass fiber net and a water removal agent; the pre-dust removing device can adopt one of cloth bag dust removing and cyclone dust removing technologies.
The classified adsorption system in the step (3) comprises a flammable and explosive organic waste gas separation module, an organic waste gas concentration module and an inorganic waste gas module.
The pressure swing adsorption separation method in the step (3) is applied to a flammable and explosive organic waste gas separation module, secondary pressure swing adsorption is carried out on the flammable and explosive organic waste gas through a transformer, a fixed adsorption bed layer and a separating agent, and the separation of gaseous pollutants is realized by using the adsorption selectivity of the separating agent. Preferably, the first pressure swing adsorption preferentially separates flammable and explosive alkane and alkyne gases in the waste gas, and the flammable and explosive alkane and alkyne gases contain methane, ethane, butane, acetylene and the like; and the second pressure swing adsorption separates inflammable and explosive olefin in the waste gas, and contains ethylene, propylene and the like. The separating agent is at least one of pi complexing adsorbent, metal Organic Framework (MOFs), high silicon molecular sieve, mesoporous material, modified activated carbon and Engelhard Titanosilicate (ETS), and can be selectively used according to the exhaust gas components. The adsorption pressure of the pressure swing adsorption is 2-6mbar.
And (3) carrying out adsorption concentration on the organic waste gas by using the fixed adsorption bed layer and the adsorbent through the adsorption concentration method. The adsorbent can be at least one of zeolite molecular sieve, porous carbon material and clay-based adsorbent. The adsorption concentration method is applied to an organic waste gas concentration module.
Preferably, in order to prevent local overheating during adsorption, the separating agent and the adsorbent can be mixed with quartz sand and placed on a fixed adsorption bed, and the proportion of the quartz sand is controlled between 30% and 50%.
The flame arrester in the step (4) comprises a flame arrester core, a flame arrester shell and accessories, and is a safety device for preventing flame spread of flammable gas and flammable liquid steam. Means for preventing the passage of a propagating flame (deflagration or detonation), typically mounted in a conduit for transporting combustible gases, or on a ventilated tank.
And (5) after the step is finished, the waste gas can be regulated to a classified adsorption system through a three-way valve, a desorption valve is closed, a buffer valve and a gas communication valve are opened, and a new round of classified collection and treatment are started, so that the waste gas is reciprocated, and various gaseous pollutants are accurately and efficiently treated.
The exhaust gas emission points of the common industrial plants of VOCs are numerous and various, and most of the exhaust gas also contains inflammable and explosive gas, so that the exhaust gas emission points become the difficult points for treating the exhaust gas of the common industrial plants. The invention integrally considers the characteristics of the waste gas of the common factory and the production lifting point, divides the waste gas of the common factory into the waste gas of the production discharged in the process and the flue gas discharged in the thermal combustion equipment such as a boiler, and the like, and realizes the efficient removal of gaseous pollutants by classifying, collecting and treating the waste gas of the common factory; secondly, precisely classifying the production waste gas; thirdly, the waste gas is accurately treated.
In the aspect of accurate collection, the process of a common factory is various, so that the emission mode of the production waste gas is various, the collection efficiency is improved through different gas collection modes, the flue gas emission mode is single, and the flue gas is collected separately from the production waste gas.
In the aspect of accurate classification, the invention adopts a pressure swing adsorption separation method and an adsorption concentration method to classify inflammable and explosive organic waste gas, organic waste gas and inorganic waste gas in production waste gas, and the key point is separation of inflammable and explosive organic waste gas. The pressure swing adsorption separation method is realized by the adsorption selectivity of the separating agent to flammable and explosive gas components and the adsorption quantity is continuously changed along with the adjustment of pressure. The preferential separation of alkane mainly utilizes the interaction between methyl and alkane on the separating agent, and the preferential separation of alkene mainly utilizes the hydrogen bonding action, pore size, molecular diffusion rate difference or pi complexation action of the separating agent, and the flammable and explosive organic waste gas is separated after the separating agent is adsorbed and saturated by normal temperature purging and desorption. The adsorption concentration method is realized by mainly utilizing the mutual attraction force between the surface of an adsorbent and the molecules of the organic waste gas to generate physical adsorption (also called Van der Waals adsorption), and the high-concentration organic waste gas is obtained by using hot air to desorb after the adsorption is saturated.
In the aspect of accurate treatment, the invention selects a catalytic and high-temperature incineration treatment process according to the chemical characteristic difference of inflammable and explosive organic waste gas, high-concentration organic waste gas and inorganic waste gas. Inflammable and explosive organic waste gas in catalyst and O 2 Under the action of the catalyst, catalytic oxidation reaction is carried out, and the waste gas is purified into CO at low temperature 2 And H 2 O; inorganic waste gas and flue gas are subjected to oxidation-reduction reaction under the action of catalyst and reducing gas carbon monoxide in the waste gas, and the waste gas is purified into N at medium temperature 2 、CO 2 And H 2 O, the reaction mechanism followed the Eley-Rideal (E-R) or Langmuir-Hinshellwood (L-H) model. The high-concentration organic waste gas is sent into a boiler to be used as fuel gas for combustion, and the final product of the combustion is CO 2 、H 2 O and NOx.
Compared with the prior art, the invention has the following advantages:
1. the waste gas of the VOCs common factory realizes classified collection and classified treatment, and solves the treatment problems of various types, multi-concentration and multi-discharge waste gas.
2. The system has strong safety. The organic waste gas generally contains hazardous gases such as toxic and harmful gases, inflammable and explosive gases and the like, and at present, most of VOCs common factories are low in waste gas collection efficiency, so that waste gas is scattered in an unorganized manner, the human health is affected, the flammable and explosive gases are not considered in the collection and treatment system design, and accidents such as explosion and fire are easily caused. The invention has the advantages of ensuring personal safety and production safety, precisely collecting waste gas, sealing and conveying, and reducing unorganized dispersion; secondly, the collection and treatment of inflammable and explosive organic waste gas are fully considered, and the whole process is carried out at normal temperature or low temperature; thirdly, the flame arrestor is additionally arranged in front of the organic waste gas desorption fan, so that the flame propagation of the boiler during desorption is effectively prevented, and the occurrence of explosion and detonation is avoided; fourth, the separating agent and the adsorbent are mixed with the quartz sand in proportion to prevent local overheating during adsorption.
3. The waste gas treatment has the advantages of remarkable purification effect, low energy consumption, long service life, no secondary pollution and the like. The purification efficiency of the low-temperature catalytic oxidation system reaches more than 95%, the purification efficiency of the medium-temperature catalytic oxidation system reaches more than 97%, and various pollutants are removed efficiently; the energy consumption of the system is reduced by utilizing a heat exchange mode of the boiler; the pretreatment of the waste gas is focused before waste gas classification and treatment, substances affecting the adsorption performance and the reactivity of materials are removed, and the service life of the system is ensured; adopts dry treatment technology, and no waste water and waste residue are produced.
4. The investment operation aspect has the advantages of simplicity, low investment cost, wide application range and the like. The system is simple and convenient to operate and maintain; the existing boiler bears part of treatment functions, so that the investment cost is greatly reduced; is suitable for waste gas treatment of common factories of industrial coating, packaging printing, furniture manufacturing and the like.
Drawings
FIG. 1 is a schematic flow chart of the present invention.
Detailed Description
The invention is further described below with reference to examples and figuresThe embodiments of the present invention are not limited thereto. The normal temperature and unspecified reaction temperature of the present invention are 30-35 ℃. MOFs used in the examples are Cu-BTC and ZIF-7, the high-silicon molecular sieve is ITQ, the zeolite molecular sieve is ZSM-5, and the pi complexing adsorbent is CuCl.C 2 H 4 The porous carbon material is carbon nano tube, and the vanadium-based catalyst is V-Ce/TiO 2 The clay-based adsorbent is attapulgite clay, the mesoporous material is SBA-15, and the perovskite catalyst is La 1 (Mn 0.2 Pt 0.8 )O 3 -SO 4 - TNTs, cu/Al as Cu-based catalyst 2 O 3 ETS is Na-ETS-10.
Example 1
The invention is applied to a common factory in the packaging and printing industry, and selects a gas boiler. The boiler combustion temperature is 900 ℃, the flue gas temperature is 400 ℃, and the initial concentration of the flue gas pollutants is CO 5000mg/m 3 、NOx 350mg/m 3 80mg/m of particulate matter 3 Heavy metal 5mg/m 3 The initial concentration of the pollutant in the production waste gas is VOCs 2000ppm and CO 500mg/m 3 70mg/m of particulate matter 3 Heavy metal 3mg/m 3 15mg/m of oil mist 3 The humidity of the waste gas is 10%, and VOCs are mainly alkane.
The flue gas is subjected to heat exchange by a flue to a heat exchange device, the temperature of the flue gas is reduced to 50 ℃ after heat exchange, the flue gas enters a medium-temperature catalytic system after dust removal by a dust removal system, pollutants react with a vanadium-tungsten-titanium catalyst at the system reaction temperature of 250 ℃, and the emission concentration of the purified flue gas is 150mg/m 3 、NOx 10mg/m 3 2.4mg/m of particulate matter 3 Heavy metal 0.15mg/m 3 . Meanwhile, the production waste gas is collected by the integral ventilation, the gas collecting hood and the gas suction arm and then is pretreated by the pretreatment system, and the treated waste gas enters the classified adsorption system and sequentially passes through the inflammable and explosive organic waste gas separation module, the organic waste gas concentration module and the inorganic waste gas module. The first pressure swing adsorption of inflammable and explosive organic waste gas at 30 deg.c and pressure of 2mbar separates alkane and alkyne with MOFs + modified active carbon +30% quartz sand, and the second pressure swing adsorption at 30 deg.c and pressure of 4mbar separates alkene with high silicon molecular sieve + modified active carbon +40% quartz sandThe hydrocarbon and then the organic off-gas are dynamically adsorbed at 30 ℃ over zeolite molecular sieves +50% silica sand. After the adsorption saturation, the production waste gas is regulated to a buffer tank for temporary storage through a three-way valve, a buffer valve, a No. 1 gas communication valve, a No. 2 gas communication valve and a transformer are closed, a No. 1 desorption valve and a flammable and explosive organic waste gas desorption fan are opened, purging and desorption are carried out at 30 ℃, the flammable and explosive organic waste gas is separated out from a separating agent, the flammable and explosive organic waste gas is conveyed to a low-temperature catalytic oxidation system, and pollutants, a vanadium-based catalyst and O are mixed at 70 DEG C 2 The reaction takes place. And (3) opening a No. 2 desorption valve and an organic waste gas desorption fan to carry out desorption at the temperature of 250 ℃, heating the adsorbent to separate out high-concentration organic waste gas, and enabling the high-concentration organic waste gas to enter a boiler at the temperature of 900 ℃ through a flame arrester to be incinerated and purified. The rest inorganic waste gas is directly introduced into a medium-temperature catalytic system, and the pollutants react with the vanadium-tungsten-titanium catalyst at the reaction temperature of 250 ℃ to be purified. The emission concentration of the purified production waste gas is 100ppm of VOCs and 25mg/m of CO 3 3.5mg/m of particulate matter 3 Heavy metal 0.15mg/m 3 0mg/m of oil mist 3 The humidity of the exhaust gas is 3%.
Example 2
The invention is applied to industrial coating industry common factories, selects oil-fired boilers, the combustion temperature of the boilers is 1000 ℃, the smoke temperature is 500 ℃, and the initial concentration of smoke pollutants is CO 2000mg/m 3 、NOx 450mg/m 3 60mg/m of particulate matter 3 Heavy metal 6mg/m 3 The initial concentration of the pollutant in the production waste gas is 2500ppm of VOCs and 1000mg/m of CO 3 70mg/m of particulate matter 3 Heavy metal 3mg/m 3 20mg/m of oil mist 3 The humidity of the waste gas is 8%, and VOCs are mainly olefins.
The flue gas is subjected to heat exchange by a flue to a heat exchange device, the temperature of the flue gas is reduced to 100 ℃ after heat exchange, the flue gas enters a medium-temperature catalytic system after dust removal by a dust removal system, pollutants react with a vanadium-molybdenum-titanium catalyst at the system reaction temperature of 350 ℃, and the emission concentration of the purified flue gas is 40mg/m 3 、NOx 9mg/m 3 1.2mg/m of particulate matter 3 Heavy metal 0.12mg/m 3 . Meanwhile, the production waste gas is collected by the integral ventilation and gas collection cover and then is pretreated by the pretreatment system, and the treated waste gas enters the classified adsorption system and sequentially passes through inflammable materialsAn explosive organic waste gas separation module, an organic waste gas concentration module and an inorganic waste gas module. The first pressure swing adsorption of inflammable and explosive organic waste gas at 35 deg.c and pressure of 3mbar separates alkane and alkyne through pi complexing adsorbent and MOFs and 40% quartz sand, the second pressure swing adsorption at 33 deg.c and pressure of 5mbar separates alkene through mesoporous material and ETS and 40% quartz sand, and the subsequent dynamic adsorption of organic waste gas at 30 deg.c through porous carbon material and zeolite molecular sieve and 40% quartz sand. After the adsorption saturation, the production waste gas is regulated to a buffer tank for temporary storage through a three-way valve, a buffer valve, a No. 1 gas communication valve, a No. 2 gas communication valve and a transformer are closed, a No. 1 desorption valve and a flammable and explosive organic waste gas desorption fan are opened, purging and desorption are carried out at 35 ℃, the flammable and explosive organic waste gas is separated out from a separating agent, the flammable and explosive organic waste gas is conveyed to a low-temperature catalytic oxidation system, and pollutants, a copper-based catalyst and O at 90℃ are conveyed to a low-temperature catalytic oxidation system 2 The reaction takes place. And (3) opening a No. 2 desorption valve and an organic waste gas desorption fan to carry out desorption at 350 ℃, heating the adsorbent to separate out high-concentration organic waste gas, and enabling the high-concentration organic waste gas to enter a boiler at 1000 ℃ through a flame arrester to be incinerated and purified. The rest inorganic waste gas is directly introduced into a medium-temperature catalytic system, and pollutants react with the vanadium-molybdenum-titanium catalyst at the reaction temperature of 350 ℃ to be purified. The emission concentration of the purified production waste gas is 50ppm of VOCs and 20mg/m of CO 3 1.4mg/m of particulate matter 3 Heavy metal 0.06mg/m 3 0mg/m of oil mist 3 The humidity of the exhaust gas is 2.5%.
Example 3
The invention is applied to common factories in furniture manufacturing industry, and selects a special boiler for burning biomass and a biomass gasification furnace for burning biomass, wherein the average combustion temperature of the boiler is 1000 ℃, the average smoke temperature is 450 ℃, and the average initial concentration of smoke pollutants is 2300mg/m 3 、NOx 410mg/m 3 100mg/m of particulate matter 3 Heavy metal 12mg/m 3 The initial concentration of the pollutant in the production waste gas is 2300ppm of VOCs and 500mg/m of CO 3 150mg/m of particulate matter 3 Heavy metal 6mg/m 3 10mg/m of oil mist 3 The humidity of the waste gas is 9%, and VOCs are mainly alkane and alkyne.
The flue gas is subjected to heat exchange by a flue gas channel to a heat exchange device, the temperature of the flue gas is reduced to 70 ℃ after the heat exchange, and the flue gas is subjected to dust removalThe dust removed by the system enters a medium-temperature catalytic system, the reaction temperature of the system is 300 ℃, the pollutant reacts with the perovskite catalyst, and the emission concentration of the purified flue gas is CO 26mg/m 3 、NOx 5mg/m 3 3mg/m of particulate matter 3 Heavy metal 0.2mg/m 3 . Meanwhile, the production waste gas is collected by the integral ventilation and air suction arm and then is pretreated by the pretreatment system, and the treated waste gas enters the classified adsorption system and sequentially passes through the inflammable and explosive organic waste gas separation module, the organic waste gas concentration module and the inorganic waste gas module. The first pressure swing adsorption of inflammable and explosive organic waste gas at 31 deg.c and 5mbar pressure separates alkane and alkyne through mesoporous material, modified active carbon and 40% quartz sand, the second pressure swing adsorption at 35 deg.c and 3mbar pressure separates alkene through high silicon molecular sieve, ETS and 40% quartz sand, and the subsequent dynamic adsorption of organic waste gas at 30 deg.c through clay-based adsorbent, porous carbon material and 20% quartz sand. After the adsorption saturation, the production waste gas is regulated to a buffer tank for temporary storage through a three-way valve, a buffer valve, a No. 1 gas communication valve, a No. 2 gas communication valve and a transformer are closed, a No. 1 desorption valve and a flammable and explosive organic waste gas desorption fan are opened, purging and desorption are carried out at 32 ℃, and the flammable and explosive organic waste gas is separated out by a separating agent and is conveyed to a low-temperature catalytic oxidation system, and pollutants, a molecular sieve catalyst and O at 77℃ are conveyed to a low-temperature catalytic oxidation system 2 The reaction takes place. And (3) opening a No. 2 desorption valve and an organic waste gas desorption fan to carry out desorption at 300 ℃, heating the adsorbent to separate out high-concentration organic waste gas, and enabling the high-concentration organic waste gas to enter a boiler at 1000 ℃ through a flame arrester to be incinerated and purified. The rest inorganic waste gas is directly introduced into a medium-temperature catalytic system, and the pollutants react with the perovskite catalyst for purification at the reaction temperature of 350 ℃. The emission concentration of the purified production waste gas is 44ppm of VOCs and 10mg/m of CO 3 2mg/m of particulate matter 3 Heavy metal 0.1mg/m 3 0mg/m of oil mist 3 The humidity of the exhaust gas is 4%.
Comparative example 1
Simulation example 1 application scenario and exhaust gas atmosphere, namely: the method is applied to a common factory in the packaging and printing industry, and selects a gas boiler, wherein the combustion temperature of the boiler is 900 ℃, the temperature of smoke is 400 ℃, and the initial concentration of the smoke pollutants is CO 5000mg/m 3 、NOx 350mg/m 3 80mg/m of particulate matter 3 Heavy metal 5mg/m 3 The initial concentration of the pollutant in the production waste gas is VOCs 2000ppm and CO 500mg/m 3 70mg/m of particulate matter 3 Heavy metal 3mg/m 3 15mg/m of oil mist 3 The humidity of the waste gas is 10%, and VOCs are mainly alkane. The waste gas of production gets into categorised adsorption system, does not carry out pressure swing adsorption separation to the inflammable and explosive gas in the waste gas of production, can have serious potential safety hazard, does not possess the running condition, because: the waste gas produced by VOCs common factories such as packaging and printing industry common factories contains inflammable and explosive gas, and after adsorption concentration, thermal desorption and incineration treatment can lead to detonation/detonation of the system and the boiler.
Comparative example 2
Simulation example 1 application scenario and exhaust gas atmosphere, namely: the method is applied to a common factory in the packaging and printing industry, and selects a gas boiler, wherein the combustion temperature of the boiler is 900 ℃, the temperature of smoke is 400 ℃, and the initial concentration of the smoke pollutants is CO 5000mg/m 3 、NOx 350mg/m 3 80mg/m of particulate matter 3 Heavy metal 5mg/m 3 The initial concentration of the pollutant in the production waste gas is VOCs 2000ppm and CO 500mg/m 3 70mg/m of particulate matter 3 Heavy metal 3mg/m 3 15mg/m of oil mist 3 The humidity of the waste gas is 10%, and VOCs are mainly alkane. The waste gas produced by the process enters a classification adsorption system without pretreatment, and the flammable and explosive organic waste gas separation module adopts normal pressure adsorption separation. The following problems occur without pretreatment: 1. the separating agent and the adsorbent are inactivated when meeting water; 2. the granular pollutants are blocked and deposited on the surface structures of the separating agent and the adsorbent, the adsorption sites are rapidly reduced, and the separating and adsorbing performances are reduced. At normal temperature and pressure, the adsorption and separation effects of flammable and explosive organic waste gas are very weak, and the flammable and explosive gas which is not completely separated enters the organic gas adsorption and concentration module, so that the system and the boiler detonate.
Comparative example 3
Simulation example 1 application scenario and exhaust gas atmosphere, namely: the method is applied to a common factory in the packaging and printing industry, and selects a gas boiler, wherein the combustion temperature of the boiler is 900 ℃, the temperature of smoke is 400 ℃, and the initial concentration of the smoke pollutants is CO 5000mg/m 3 、NOx 350mg/m 3 80mg/m of particulate matter 3 Heavy metal 5mg/m 3 The initial concentration of the pollutant in the production waste gas is VOCs 2000ppm and CO 500mg/m 3 70mg/m of particulate matter 3 Heavy metal 3mg/m 3 15mg/m of oil mist 3 The humidity of the waste gas is 10%, and VOCs are mainly alkane. Finally, the boiler flue gas and the production waste gas enter a low-temperature catalytic oxidation system for purification treatment, and the emission concentration of the purified flue gas is CO 2730mg/m 3 、NOx 193mg/m 3 2.4mg/m of particulate matter 3 Heavy metal 0.15mg/m 3 . The emission concentration of the purified production waste gas is 1100ppm of VOCs and 300mg/m of CO 3 3.5mg/m of particulate matter 3 Heavy metal 0.15mg/m 3 0mg/m of oil mist 3 The humidity of the exhaust gas is 3%. The purification efficiency is reduced from 95% of the embodiment 1 to below 50% because the low-temperature catalytic oxidation system and the medium-temperature catalytic system have different purification principles, the low-temperature catalytic oxidation system has low reaction temperature and is designed for inflammable and explosive waste gas, the concentration and reaction energy of boiler flue gas, organic waste gas and inorganic waste gas are higher, and high-efficiency removal is realized by means of medium-high temperature, catalyst and reducing gas. Secondly, various gases may produce competitive adsorption, and the purification efficiency is lowered.
Claims (7)
1. The VOCs commonplace factory waste gas classifying, collecting and treating system is characterized by comprising a waste gas classifying, collecting system and a waste gas treating system; the waste gas classified collection system comprises a collection system, a pretreatment system, a classified adsorption system and a desorption system; the waste gas treatment system comprises a heat exchange device, a dust removal system, a low-temperature catalytic oxidation system and a medium-temperature catalytic system; the specific steps of waste gas classified collection and treatment by the VOCs common factory waste gas classified collection and treatment system are as follows:
(1) The boiler flue gas exchanges heat through a flue to a heat exchange device, the temperature of the flue gas is reduced to 50-100 ℃ after heat exchange, and then the flue gas enters a dust removal system to remove granular pollutants in the flue gas; the flue gas after dust removal enters a medium-temperature catalytic system for treatment, the reaction temperature is 250-350 ℃, and nitrogen oxides and carbon monoxide in the flue gas are removed;
(2) The production waste gas of the VOCs common factory is pretreated by a pretreatment system through a collection system, and oil mist, paint mist, water and granular pollutants in the production waste gas are removed at normal temperature; the collecting system comprises an integral ventilation hood, an air suction arm collecting facility, a corrosion-resistant air collecting pipeline and a flue; the pretreatment system comprises a pre-degreasing device, a dry filter and a pre-dedusting device;
(3) The production waste gas is pretreated and enters a classification adsorption system, a pressure swing adsorption separation method is adopted, and a separating agent carries out secondary pressure swing adsorption on inflammable and explosive organic waste gas at normal temperature; then the organic waste gas is dynamically adsorbed by the adsorbent at normal temperature by using an adsorption concentration method, so that classified collection is realized; the classified adsorption system comprises a flammable and explosive organic waste gas separation module, an organic waste gas concentration module and an inorganic waste gas module; the pressure swing adsorption separation method is applied to a flammable and explosive organic waste gas separation module, and is used for carrying out secondary pressure swing adsorption on the flammable and explosive organic waste gas through a transformer, a fixed adsorption bed layer and a separating agent, and the gaseous pollutant separation is realized by utilizing the adsorption selectivity of the separating agent; the adsorption concentration method is characterized in that organic waste gas is subjected to adsorption concentration through a fixed adsorption bed layer and an adsorbent; the adsorbent is at least one of zeolite molecular sieve, porous carbon material and clay-based adsorbent; the adsorption concentration method is applied to an organic waste gas concentration module;
(4) After the inflammable and explosive organic waste gas and the organic waste gas are adsorbed and saturated, the production waste gas is sent to a buffer tank for temporary storage, a desorption valve and an inflammable and explosive organic waste gas desorption fan are opened, purging and desorption are carried out at normal temperature, the inflammable and explosive organic waste gas is separated out by a separating agent, and the inflammable and explosive organic waste gas is sent to a low-temperature catalytic oxidation system for treatment at 70-90 ℃ to remove inflammable and explosive organic pollutants in the production waste gas; opening a desorption valve and an organic waste gas desorption fan, blowing and desorbing at 250-350 ℃, heating an adsorbent to separate out high-concentration organic waste gas, and feeding the high-concentration organic waste gas into a boiler through a flame arrester for high-temperature incineration treatment to remove volatile organic matters and volatile malodorous organic matters; the rest inorganic waste gas is directly connected to a medium-temperature catalytic system for treatment, so that carbon monoxide and nitrogen oxides in the production waste gas are removed; realizing various waste gas classification treatments;
(5) The treated boiler flue gas and the treated production waste gas are uniformly discharged through a chimney after reaching standards.
2. The VOCs commonplace plant exhaust gas classifying, collecting and treating system according to claim 1, wherein:
the medium-temperature catalytic system in the step (1) and the step (4) comprises a medium-temperature catalyst, quartz sand, a catalytic fixed bed and a heat conducting pipe;
the low-temperature catalytic oxidation system in the step (4) comprises a low-temperature catalyst, quartz sand, a catalytic fixed bed and a heat conduction pipe.
3. The VOCs commonplace plant exhaust gas classifying, collecting and treating system according to claim 2, wherein: the medium-temperature catalyst is at least one of vanadium-tungsten-titanium, vanadium-molybdenum-titanium and perovskite catalysts; the medium-temperature catalytic system heats the reaction temperature to 250-350 ℃;
the low-temperature catalyst is at least one of cerium-based, vanadium-based and copper-based catalysts; the low-temperature catalytic oxidation system maintains the reaction temperature at 70-90 ℃.
4. The VOCs commonplace plant exhaust gas classifying, collecting and treating system according to claim 1, wherein: the capillary heat conduction pipe is arranged in the heat exchange device in the step (1), is vertical to the flue gas direction, and after the flue gas exchanges heat, heat is continuously supplied to the organic waste gas desorption fan and the catalytic oxidation system in the form of oil or steam, wherein the heat after the heat exchange is directly communicated with the organic waste gas desorption fan and the medium-temperature catalytic system through the heat conduction pipe, so that the temperature of the organic waste gas desorption fan and the medium-temperature catalytic system is kept between 250 ℃ and 350 ℃; the heat is consumed by the medium-temperature catalytic system and then is introduced into the low-temperature catalytic oxidation system, and the temperature of the system is regulated by the cooling fan, so that the reaction temperature of the system is kept between 70 and 90 ℃.
5. The VOCs commonplace plant exhaust gas classifying, collecting and treating system according to claim 1, wherein: flammable and explosive alkane and alkyne gases in the waste gas are separated through first pressure swing adsorption; the flammable and explosive olefin in the waste gas is separated by the second pressure swing adsorption; the separating agent is at least one of metal organic framework material, high silicon molecular sieve and modified activated carbon.
6. The VOCs commonplace plant exhaust gas classifying, collecting and treating system according to claim 1, wherein: the treatment technology of the pre-degreasing device adopts at least one of filtration adsorption, mechanical separation, electrostatic deposition, wet washing and ultraviolet photolysis purification technology; the dry filter achieves the water removal effect by filling a filter material, wherein the filter material adopts at least one of quartz cotton, a glass fiber net and a water removal agent; the pre-dust removing device adopts one of cloth bag dust removing and cyclone dust removing technologies.
7. The VOCs commonplace plant exhaust gas classifying, collecting and treating system according to claim 1, wherein: the dust removing system in the step (1) comprises at least one of cloth bag dust removal, cyclone dust removal, electrostatic dust removal, wet electric dust removal and water film dust removal; the flame arrestor of step (4) comprises a flame arrestor core and a flame arrestor housing, a safety device for preventing the flame propagation of flammable gases and flammable liquid vapors.
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| CN106310871A (en) * | 2016-08-31 | 2017-01-11 | 浙江奇彩环境科技股份有限公司 | Method for joint degradation of waste gases in coal chemical industry |
| CN108744882A (en) * | 2018-05-29 | 2018-11-06 | 浙江天采云集科技股份有限公司 | A kind of LED-MOCVD processing procedures exhaust gas method that warm journey pressure-variable adsorption puies forward ammonia recycling entirely |
| CN109381964A (en) * | 2018-09-28 | 2019-02-26 | 中科天龙（厦门）环保股份有限公司 | Organic exhaust gas recovery and processing system and method |
| CN111495136A (en) * | 2020-04-23 | 2020-08-07 | 生态环境部华南环境科学研究所 | Full-flow low-temperature dry-method deep treatment system for waste heat treatment flue gas |
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