CN113499683A - VOC (volatile organic compound) based on catalytic oxidationsComposite processing system and method - Google Patents
VOC (volatile organic compound) based on catalytic oxidationsComposite processing system and method Download PDFInfo
- Publication number
- CN113499683A CN113499683A CN202110372527.7A CN202110372527A CN113499683A CN 113499683 A CN113499683 A CN 113499683A CN 202110372527 A CN202110372527 A CN 202110372527A CN 113499683 A CN113499683 A CN 113499683A
- Authority
- CN
- China
- Prior art keywords
- composite treatment
- catalytic oxidation
- ozone
- treatment device
- waste gas
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 230000003197 catalytic effect Effects 0.000 title claims abstract description 88
- 239000012855 volatile organic compound Substances 0.000 title claims abstract description 88
- 238000000034 method Methods 0.000 title claims abstract description 37
- 238000012545 processing Methods 0.000 title claims description 15
- 239000002131 composite material Substances 0.000 claims abstract description 156
- CBENFWSGALASAD-UHFFFAOYSA-N Ozone Chemical compound [O-][O+]=O CBENFWSGALASAD-UHFFFAOYSA-N 0.000 claims abstract description 94
- 238000001179 sorption measurement Methods 0.000 claims abstract description 91
- 238000007254 oxidation reaction Methods 0.000 claims abstract description 83
- 239000002912 waste gas Substances 0.000 claims abstract description 83
- 230000003647 oxidation Effects 0.000 claims abstract description 78
- 238000003795 desorption Methods 0.000 claims abstract description 57
- 239000007789 gas Substances 0.000 claims abstract description 51
- 238000001816 cooling Methods 0.000 claims abstract description 47
- 239000003054 catalyst Substances 0.000 claims abstract description 26
- 238000000354 decomposition reaction Methods 0.000 claims abstract description 23
- 239000013078 crystal Substances 0.000 claims abstract description 21
- 238000005265 energy consumption Methods 0.000 claims abstract description 4
- 238000000746 purification Methods 0.000 claims description 16
- 239000002957 persistent organic pollutant Substances 0.000 claims description 15
- 238000001914 filtration Methods 0.000 claims description 12
- 239000002245 particle Substances 0.000 claims description 12
- 239000000463 material Substances 0.000 claims description 10
- 229910044991 metal oxide Inorganic materials 0.000 claims description 7
- 150000004706 metal oxides Chemical class 0.000 claims description 7
- 229920006395 saturated elastomer Polymers 0.000 claims description 6
- 229920000742 Cotton Polymers 0.000 claims description 3
- 230000009471 action Effects 0.000 claims description 3
- 229910052782 aluminium Inorganic materials 0.000 claims description 3
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 3
- 239000000969 carrier Substances 0.000 claims description 3
- 239000003365 glass fiber Substances 0.000 claims description 3
- 238000005470 impregnation Methods 0.000 claims description 3
- 239000004745 nonwoven fabric Substances 0.000 claims description 3
- 239000012141 concentrate Substances 0.000 claims description 2
- 238000006555 catalytic reaction Methods 0.000 claims 1
- 238000003672 processing method Methods 0.000 claims 1
- 238000002156 mixing Methods 0.000 abstract description 4
- 230000008569 process Effects 0.000 description 21
- 239000002808 molecular sieve Substances 0.000 description 20
- URGAHOPLAPQHLN-UHFFFAOYSA-N sodium aluminosilicate Chemical compound [Na+].[Al+3].[O-][Si]([O-])=O.[O-][Si]([O-])=O URGAHOPLAPQHLN-UHFFFAOYSA-N 0.000 description 20
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 10
- YXFVVABEGXRONW-UHFFFAOYSA-N Toluene Chemical compound CC1=CC=CC=C1 YXFVVABEGXRONW-UHFFFAOYSA-N 0.000 description 9
- 230000000694 effects Effects 0.000 description 8
- 229910000510 noble metal Inorganic materials 0.000 description 6
- 239000010815 organic waste Substances 0.000 description 6
- 230000008929 regeneration Effects 0.000 description 6
- 238000011069 regeneration method Methods 0.000 description 6
- RNFJDJUURJAICM-UHFFFAOYSA-N 2,2,4,4,6,6-hexaphenoxy-1,3,5-triaza-2$l^{5},4$l^{5},6$l^{5}-triphosphacyclohexa-1,3,5-triene Chemical compound N=1P(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP=1(OC=1C=CC=CC=1)OC1=CC=CC=C1 RNFJDJUURJAICM-UHFFFAOYSA-N 0.000 description 5
- 229910002092 carbon dioxide Inorganic materials 0.000 description 5
- 239000001569 carbon dioxide Substances 0.000 description 5
- 239000003063 flame retardant Substances 0.000 description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 5
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 4
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 4
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 4
- 229910021536 Zeolite Inorganic materials 0.000 description 4
- 239000003463 adsorbent Substances 0.000 description 4
- HNPSIPDUKPIQMN-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical compound O=[Si]=O.O=[Al]O[Al]=O HNPSIPDUKPIQMN-UHFFFAOYSA-N 0.000 description 4
- 239000010457 zeolite Substances 0.000 description 4
- WJIFKOVZNJTSGO-UHFFFAOYSA-N 1-bromo-3-methylbenzene Chemical compound CC1=CC=CC(Br)=C1 WJIFKOVZNJTSGO-UHFFFAOYSA-N 0.000 description 3
- ZBTMRBYMKUEVEU-UHFFFAOYSA-N 1-bromo-4-methylbenzene Chemical compound CC1=CC=C(Br)C=C1 ZBTMRBYMKUEVEU-UHFFFAOYSA-N 0.000 description 3
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 3
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 3
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 3
- 238000001035 drying Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- VUZPPFZMUPKLLV-UHFFFAOYSA-N methane;hydrate Chemical compound C.O VUZPPFZMUPKLLV-UHFFFAOYSA-N 0.000 description 3
- 229910052760 oxygen Inorganic materials 0.000 description 3
- 239000001301 oxygen Substances 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- GISVICWQYMUPJF-UHFFFAOYSA-N 2,4-Dimethylbenzaldehyde Chemical compound CC1=CC=C(C=O)C(C)=C1 GISVICWQYMUPJF-UHFFFAOYSA-N 0.000 description 2
- KQOQXYPZBYTICM-UHFFFAOYSA-N 3-bromo-2,2-dimethylpropan-1-ol Chemical compound OCC(C)(C)CBr KQOQXYPZBYTICM-UHFFFAOYSA-N 0.000 description 2
- UFWIBTONFRDIAS-UHFFFAOYSA-N Naphthalene Chemical compound C1=CC=CC2=CC=CC=C21 UFWIBTONFRDIAS-UHFFFAOYSA-N 0.000 description 2
- 239000006227 byproduct Substances 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 2
- 239000004927 clay Substances 0.000 description 2
- 229910052570 clay Inorganic materials 0.000 description 2
- 239000011248 coating agent Substances 0.000 description 2
- 238000000576 coating method Methods 0.000 description 2
- 238000002485 combustion reaction Methods 0.000 description 2
- 239000010949 copper Substances 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 239000003344 environmental pollutant Substances 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 230000036541 health Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000012621 metal-organic framework Substances 0.000 description 2
- 231100000719 pollutant Toxicity 0.000 description 2
- 239000000377 silicon dioxide Substances 0.000 description 2
- 239000004408 titanium dioxide Substances 0.000 description 2
- 229920000049 Carbon (fiber) Polymers 0.000 description 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 208000033962 Fontaine progeroid syndrome Diseases 0.000 description 1
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 1
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 description 1
- 238000003723 Smelting Methods 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000004917 carbon fiber Substances 0.000 description 1
- 239000010941 cobalt Substances 0.000 description 1
- 229910017052 cobalt Inorganic materials 0.000 description 1
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 125000004122 cyclic group Chemical group 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 239000010411 electrocatalyst Substances 0.000 description 1
- 238000002290 gas chromatography-mass spectrometry Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 229910001385 heavy metal Inorganic materials 0.000 description 1
- 125000005842 heteroatom Chemical group 0.000 description 1
- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 1
- 230000008676 import Effects 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 229910052750 molybdenum Inorganic materials 0.000 description 1
- 239000011733 molybdenum Substances 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 239000005416 organic matter Substances 0.000 description 1
- 238000006385 ozonation reaction Methods 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 238000007639 printing Methods 0.000 description 1
- 238000004451 qualitative analysis Methods 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 235000012239 silicon dioxide Nutrition 0.000 description 1
- 238000002470 solid-phase micro-extraction Methods 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 238000000859 sublimation Methods 0.000 description 1
- 230000008022 sublimation Effects 0.000 description 1
- 229910052723 transition metal Inorganic materials 0.000 description 1
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 description 1
- 229910052721 tungsten Inorganic materials 0.000 description 1
- 239000010937 tungsten Substances 0.000 description 1
- 230000007306 turnover Effects 0.000 description 1
Images
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
- B01D53/34—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
- B01D53/02—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
- 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
- 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)
- Environmental & Geological Engineering (AREA)
- Health & Medical Sciences (AREA)
- Biomedical Technology (AREA)
- Treating Waste Gases (AREA)
- Exhaust Gas Treatment By Means Of Catalyst (AREA)
Abstract
本发明公开了一种基于催化氧化的VOCs复合处理系统及方法。本发明一种基于催化氧化的VOCs复合处理系统，包括废气引风机、主排风机、脱附主风机、冷却引风机、加热器、三个复合处理装置。三个复合处理装置结构相同，均包括吸附单元和臭氧催化氧化单元。吸附单元的输出口与臭氧催化氧化单元的输入口连接。吸附单元对VOCs废气进行吸附。臭氧催化氧化单元内设置有催化，在输入臭氧的情况下，对VOCs废气进行催化氧化分解。本发明中的催化剂是分别由α、β、γ晶型催化剂混合而成，发挥最大的热稳定性和高催化活性，不易烧结。此外，本发明通过催化氧化来实现VOCs废气的分解，能耗较低，且系统更加稳定可靠。
The invention discloses a VOC s composite treatment system and method based on catalytic oxidation. The present invention is a VOC s composite treatment system based on catalytic oxidation, which includes an exhaust gas induced draft fan, a main exhaust fan, a desorption main fan, a cooling induced draft fan, a heater, and three composite treatment devices. The three composite treatment devices have the same structure, including adsorption unit and ozone catalytic oxidation unit. The output port of the adsorption unit is connected with the input port of the ozone catalytic oxidation unit. The adsorption unit adsorbs VOCs exhaust gas. The ozone catalytic oxidation unit is equipped with a catalyst, and in the case of inputting ozone, the VOCs exhaust gas is catalytically oxidized and decomposed. The catalyst in the present invention is formed by mixing α, β and γ crystal type catalysts respectively, which exerts maximum thermal stability and high catalytic activity, and is not easy to sinter. In addition, the invention realizes the decomposition of VOCs waste gas through catalytic oxidation, the energy consumption is lower, and the system is more stable and reliable.
Description
Technical Field
The invention belongs to the technical field of treatment of organic waste gas with ultralow concentration and large air volume. In particular to a set of volatile organic compound composite treatment device and a treatment process thereof.
Background
VOCs waste gas has extremely strong volatility, and the generation ways of the VOCs waste gas are diversified and mainly come from coating, motor vehicle tail gas and heavy metal smelting. The air is seriously polluted, and the health of human bodies is also greatly influenced. Common treatment techniques for industrial VOCs include: adsorption, combustion, catalytic oxidation, absorption, and the like.
The adsorption method for removing organic matters is to intercept organic matter molecules by utilizing adsorbents such as active carbon, carbon fibers, molecular sieves and the like with large specific surface area and porous structures, and when waste gas passes through an adsorption bed, the organic matters are adsorbed in pores, so that the gas is purified. The adsorption method is mainly suitable for the recovery and treatment of VOCs gas with large air quantity, low humidity, low temperature and concentration less than 5000 ppm. The adsorption effect of the VOCs is influenced by many factors, and the physical properties and chemical properties of the adsorbent, the molecular structure of the VOCs, the temperature and humidity of the external environment, coexisting pollutants and the like all influence the process performance of the adsorption method. The molecular sieve rotating wheel is actually a concentrator, and the molecular sieve is used as an adsorbing material, so that VOCs waste gas with originally high air volume and low concentration can be converted into waste gas with low air volume and high concentration, and the concentration multiple reaches 5-20 times. The runner is of a honeycomb structure and can be divided into a treatment area, a regeneration area and a cooling area, and the concentration runner continuously runs in each area. VOCs are adsorbed and removed by the adsorbent in the treatment area, and purified air is discharged from the treatment area of the concentration rotating wheel. The organic waste gas VOCs adsorbed in the concentration rotating wheel is desorbed in a regeneration zone through hot air treatment. The concentration rotating wheel is cooled in the cooling zone, the air passing through the cooling zone is heated and then used as regeneration air, and the energy-saving effect is achieved.
Ozone catalytic oxidation is an advanced oxidation technology carried out under low temperature conditions, and the mechanism of the ozone catalytic oxidation is that in the catalytic oxidation reaction process, ozone and VOCs are adsorbed on the surface of a catalyst, the ozone is decomposed to generate active oxygen, and the active oxygen reacts with the VOCs to finally generate carbon dioxide and water. The research finds that the free radicals can be oxygen free radicals and hydroxyl free radicals, the two free radicals are extremely strong in oxidizability, and the oxidation capability of the two free radicals is in a linear relation with the number of the free radicals. At present, a supported catalyst is mostly adopted, and the carrier of the supported catalyst mainly comprises alumina, silica, titanium dioxide, zeolite and molecular sieve. The loaded active components comprise noble metals and non-noble metals. The catalytic ozonation process is simple, reliable and stable, and has an obvious purification effect on VOCs.
The organic waste gas has complex components and large concentration difference, and is especially the organic waste gas discharged in industrial production. For the treatment of different VOCs, only a single process is used, the treatment efficiency is low, and the defects of incomplete reaction, difficulty in controlling byproducts and the like exist when the single process is used alone, so that the VOCs are treated by adopting a method of combining two processes.
Disclosure of Invention
The invention aims to solve the technical problems and provide a VOC (volatile organic compound) based on catalytic oxidationsComposite processing system and method
The invention relates to a VOC (volatile organic compound) based on catalytic oxidationsThe composite treatment system comprises a waste gas draught fan, a main exhaust fan, a desorption main fan, a cooling draught fan, a heater and three composite treatment devices. The three composite treatment devices have the same structure and respectively comprise an adsorption unit and an ozone catalytic oxidation unit. The output port of the adsorption unit is connected with the input port of the ozone catalytic oxidation unit. The adsorption unit adsorbs the VOCs waste gas. The ozone catalytic oxidation unit is internally provided with a catalyst, and VOCs waste gas is subjected to catalytic oxidation decomposition under the condition of inputting ozone.
The three composite treatment devices are provided with five air vents which are respectively a waste gas inlet, a desorption inlet, a cooling inlet, an ozone inlet and a purification air outlet. The waste gas inlet, the desorption inlet and the cooling inlet are connected to the input port of the adsorption unit; the ozone inlet is connected to an ozone supply port of the ozone catalytic oxidation unit; the output port of the ozone catalytic oxidation unit is connected to the purification air outlet. The waste gas inlets of the three composite treatment devices are connected to a VOCs waste gas conveying pipeline. And an air outlet of the cooling induced draft fan is connected to cooling inlets of the three composite treatment devices. The purifying air outlets of the three composite treatment devices are connected to the chimney through three valves and connected to the air inlet of the main desorption fan through another three valves. The air outlet of the main desorption fan is connected to desorption air inlets of the three composite treatment devices through the heater and the valve. The ozone outlet of the ozone generator is connected to the ozone inlets of the three composite treatment devices. And an air outlet of the cooling induced draft fan is connected to cooling inlets of the three composite treatment devices.
Preferably, the composite treatment device has three operating states, namely an adsorption state, a desorption decomposition state and a cooling state. Under the adsorption state, VOCs waste gas is input from the waste gas inlet and is output from the purification gas outlet after organic pollutants are removed in the adsorption unit. Under the desorption decomposition state, hot air flow is input from a desorption inlet, so that organic pollutants in the adsorption unit are desorbed, and the concentration of VOCs waste gas is realized; the concentrated VOCs waste gas enters an ozone catalytic oxidation unit; ozone is input into the ozone catalytic oxidation unit from the ozone inlet, and the ozone catalytic oxidation unit carries out catalytic oxidation decomposition on the VOCs waste gas under the action of the ozone and the catalyst. In the cooling state, cold air flow is input from the cooling inlet, so that the temperature of the adsorption unit is reduced until the adsorption unit can adsorb the VOCs waste gas again.
Preferably, the catalyst adopted in the ozone catalytic oxidation unit is a MnOx-CeOx-LaOx catalyst prepared by a supersaturated impregnation method by using three metal oxide particles with different crystal forms as carriers.
Preferably, the crystal forms of the three metal oxide particles are alpha crystal forms, beta crystal forms and gamma crystal forms respectively. The mass ratio of the alpha, beta and gamma crystal forms of the metal oxide is 3:4: 3.
Preferably, the metal oxide is alumina.
Preferably, a mass flow meter and a flame retardant device are further arranged between the air outlet of the main desorption fan and the desorption air inlets of the three composite treatment devices.
Preferably, a second three-way valve is further arranged between the air outlet of the main desorption fan and the desorption air inlets of the three combined treatment devices. And a third air port of the second three-way valve is connected with the waste gas conveying pipeline.
Preferably, the adsorbing material in the adsorption unit is activated carbon, molecular sieve, clay, zeolite or metal organic framework material.
Preferably, the adsorption unit adopts a molecular sieve rotating wheel. The diameter of the rotating wheel of the molecular sieve rotating wheel is 2000-3000 mm, and the thickness of the rotating wheel is 500-600 mm.
Preferably, a waste gas draught fan and a dry filter box which are sequentially connected in series are arranged between the VOCs waste gas conveying pipeline and the three composite treatment devices.
Preferably, the dry filter box is internally provided with a primary filter, a medium filter and a high efficiency filter which are arranged in sequence. The primary filter, the intermediate filter and the high-efficiency filter all adopt quick-release aluminum frame filter bags. Wherein, the filter bag of the primary filter is made of filter cotton material, and the filtering grain size is more than or equal to 5 μm. The filter bag of the medium-efficiency filter is made of non-woven fabrics, and the filtering particle size is 1-5 mu m. The filter bag of the high-efficiency filter is made of glass fiber materials, and the filtering particle size is 0.1-1 mu m. Pressure difference meters are led out from the input port of the dry type filter box, between any two filters and the output port.
Preferably, a first three-way valve is arranged between the exhaust gas induced draft fan and the dry type filter box. The first vent of the first three-way valve is connected; and a second vent of the first three-way valve is connected with an input port of the dry type filter box. And a third air port of the first three-way valve is connected with a chimney. When a fault occurs, the VOCs waste gas is emptied by switching the first three-way valve.
Preferably, the waste gas inlet, the desorption inlet, the cooling inlet and the ozone inlet of the three composite treatment devices are respectively provided with a flap valve.
The VOC based on catalytic oxidationsThe specific treatment process of the composite treatment system is carried out according to the following steps:
and step one, defining the three composite processing devices as a first composite processing device, a second composite processing device and a third composite processing device respectively. The waste gas import and the purification gas outlet of first composite treatment device are opened, get into adsorption state, and the adsorption unit of first composite treatment device adsorbs the concentration to the organic pollutant in the VOCs waste gas of input.
And step two, after the adsorption unit in the first composite treatment device is adsorbed and saturated, the first composite treatment device enters a desorption decomposition state. The heater obtained by heating the heater enters the adsorption unit of the first composite treatment device from the desorption inlet of the first composite treatment device, so that the organic matters adsorbed in the first composite treatment device are desorbed and enter the ozone catalytic oxidation unit along with the air flow. Ozone generated by the ozone generator enters an ozone catalytic oxidation unit of the first composite treatment device; the ozone catalytic oxidation unit carries out catalytic oxidation on the organic pollutants. Meanwhile, the second combined treatment device enters an adsorption state.
And step three, after the adsorption unit in the second composite treatment device is saturated, the second composite treatment device enters a desorption decomposition state. The third composite processing device enters an adsorption state. The first composite treatment device enters a cooling state, and the cooling draught fan introduces cold air from the external environment to flow into the adsorption unit of the first composite treatment device, so that the temperature in the first composite treatment device is reduced, and the original adsorption capacity is recovered. The gas flow with the increased temperature output by the first composite treatment device is merged into the second composite treatment device in a desorption decomposition state, so that the energy consumption is reduced.
And step four, circularly switching the first composite treatment device, the second composite treatment device and the third composite treatment device among an adsorption state, a desorption decomposition state and a cooling state, so that one composite treatment device is in the adsorption state at any moment.
The invention has the beneficial effects that:
1. the invention has high purification efficiency of VOCs. The invention uses a set of 'composite' VOCs treatment device, the adopted adsorbent is a molecular sieve, the adsorption and desorption efficiency of the molecular sieve is high, most VOCs can be adsorbed and concentrated, and then the treatment is carried out through ozone catalytic oxidation, the VOCs gas is degraded into carbon dioxide and water by the ozone catalytic oxidation unit, and the carbon dioxide and the water are discharged when reaching the standard, and are circularly treated when not reaching the standard. In conclusion, the device of the invention has remarkable purification effect on VOCs. The energy-saving high-temperature conversion catalyst in the ozone catalytic oxidation device is formed by mixing alpha, beta and gamma crystal form catalysts respectively, exerts the maximum thermal stability and high catalytic activity and is not easy to sinter.
2. The invention is energy-saving and environment-friendly, and has no secondary pollutants. A small part of the tail gas after combustion enters the atmosphere, and the large part of the tail gas is sent to the cooling area of the adsorption unit and is used for recycling the molecular sieve rotating wheel, so that the heat energy required by catalytic oxidation and adsorption can be met, and the aim of saving energy is fulfilled. In addition, the pressure drop generated by the adsorption of VOCs by the molecular sieve rotating wheel is extremely low, and the power consumption can be greatly reduced. The VOCs are degraded into carbon dioxide and water by ozone catalytic oxidation, and the tail gas is discharged to the atmosphere only after reaching the standard through detection, so that other byproducts and secondary pollution are avoided.
3. The invention has simple treatment process, stability, easy control, safety and reliability. The process only comprises a filtering and adsorbing unit and an ozone catalytic oxidation unit, and is simple in treatment process, simple in equipment operation, stable, convenient and easy to manage through PLC control. The waste gas is pretreated by the dry filter, and the subsequent process is carried out after particulate matters mixed in the waste gas are removed, so that the ozone generator and the electric control equipment thereof for generating ozone can be placed at the far end and are not in direct contact with the waste gas. In addition, the invention adopts a modular design, has the minimum space requirement and provides a continuous and unmanned control mode. In addition, the invention adopts a PLC automatic control technology, realizes automatic control of the system, is started by a single key, is simple to operate, can be matched with a human-computer interface to monitor important operation data, flexibly and accurately controls the whole treatment process, and improves the stability and controllability of the whole process.
4. Low investment and operation cost and wide application range. Aiming at the treatment of industrial discharged waste gas with low concentration, large air volume and complex components, the molecular sieve rotating wheel is selected to convert VOCs waste gas with originally high air volume and low concentration into waste gas with low air volume and high concentration, the concentration multiple reaches 5-20 times, the specification of post-treatment equipment is greatly reduced, the operation cost is lower, the method is suitable for most VOCs discharge industries such as spraying, printing, coating production and the like, and is extremely suitable for medium and small industrial pollution enterprises.
5. The invention adopts a filtering technology, and utilizes the dry-type filter box to efficiently purify particles in the waste gas, thereby ensuring the stable and efficient operation of subsequent equipment.
Drawings
FIG. 1 is a flow diagram of an effluent treatment process of the present invention;
FIG. 2 is a comparison chart of the drying exhaust gas and the VOCs waste gas treatment result of the present invention in the specific example.
Detailed Description
The invention is further described below with reference to the accompanying drawings.
As shown in FIG. 1, a VOC based on catalytic oxidationsThe composite treatment system can perform adsorption and desorption-ozone catalytic oxidation composite treatment on volatile organic compounds and comprises a waste gas draught fan 1-1, a main exhaust fan 1-2, a desorption main fan 1-3, a cooling draught fan 1-4, a flame retardant device 3, a dry filter 4, a first three-way valve 5-1, a second three-way valve 5-1, a valve group, a mass flow meter 6, a heater 11, a first composite treatment device 8, a second composite treatment device 9 and a third composite treatment device 10. The first composite treatment device 8, the second composite treatment device 9 and the third composite treatment device 10 can perform adsorption and desorption and ozone catalytic oxidation composite treatment on volatile organic compounds.
The first composite treatment device 8, the second composite treatment device 9 and the third composite treatment device 10 have the same structure and are adsorption and desorption-ozone catalytic oxidation composite devices. The adsorption and desorption-ozone catalytic oxidation composite device comprises an adsorption unit and an ozone catalytic oxidation unit. The output port of the adsorption unit is connected with the input port of the ozone catalytic oxidation unit. The adsorption material adopts active carbon, molecular sieve, clay, zeolite or metal organic framework material. In this embodiment, the adsorption unit is preferably a molecular sieve rotating wheel. The molecular sieve wheel is divided into a treatment zone, a regeneration zone and a cooling zone. The diameter of the rotating wheel of the molecular sieve rotating wheel is 2000-3000 mm, and the thickness of the rotating wheel is 500-600 mm.
The ozone concentration of the ozone catalytic oxidation unit in the working process should be 1500-2000 mg/m3(ii) a The proportion of VOCs waste gas to ozone is 1: 15-1: 10. the ozone catalytic oxidation unit adopts a non-noble metal supported catalyst with energy-saving high-temperature conversion. Noble metals have many heteroatoms, are easy to sinter at higher temperature, cause loss of active components due to sublimation, reduce the activity, are expensive and cannot be used in a large scale. The activity of non-noble metal catalysts has been sufficient for industrial applications, and transition metal elements used to construct non-noble metal electrocatalysts include iron (Fe), cobalt (Co), nickel (Ni), copper (Cu), molybdenum (Mo), and tungsten (W). The carrier of the catalyst is alumina, silicon dioxide, titanium dioxide, zeolite or molecular sieve.
The catalyst is selected from alpha-A1 as a preferred technical scheme203、β-A1203、γ-A1203Three kinds of particles with different crystal forms are used as carriers, and the MnOx-CeOx-LaOx catalyst is prepared by adopting a supersaturation impregnation method. The carrier is formed by mixing three oxides with different crystal forms, wherein the three crystal forms are alpha crystal form, beta crystal form and gamma crystal form respectively. The catalyst has the maximum thermal stability and high catalytic activity, and is not easy to sinter. The initial crystal forms of different catalysts have great influence on the properties of the reduced catalyst, and in order to achieve the best catalytic activity, the mixing ratio of the catalysts used in the invention is respectively 30%, 40% and 30%.
The adsorption and desorption-ozone catalytic oxidation composite device is provided with five air vents which are respectively a waste gas inlet, a desorption inlet, a cooling inlet, an ozone inlet and a purification air outlet. The waste gas inlet, the desorption inlet and the cooling inlet are connected to the input port of the adsorption unit; the ozone inlet is connected to an ozone supply port of the ozone catalytic oxidation unit; the output port of the ozone catalytic oxidation unit is connected to the purification air outlet.
The adsorption-desorption-ozone catalytic oxidation composite device has three working states, namely an adsorption state, a desorption decomposition state and a cooling state. Under the adsorption state, VOCs waste gas is input from the waste gas inlet and is output from the purification gas outlet after organic pollutants are removed in the adsorption unit. Under the desorption decomposition state, hot air flow is input from a desorption inlet, so that organic pollutants in the adsorption unit are desorbed, and the concentration of VOCs waste gas is realized; the concentrated VOCs waste gas enters an ozone catalytic oxidation unit; ozone is input into the ozone catalytic oxidation unit from the ozone inlet, and the ozone catalytic oxidation unit carries out catalytic oxidation decomposition on the VOCs waste gas under the action of the ozone and the catalyst. In the cooling state, cold air flow is input from the cooling inlet, so that the temperature of the adsorption unit is reduced until the adsorption unit can adsorb the VOCs waste gas again.
An input port of the waste gas induced draft fan 1-1 is connected with a waste gas conveying pipeline, and an output port of the waste gas induced draft fan is connected with a first air vent of the first three-way valve 5-1; the second vent of the first three-way valve 5-1 is connected to the inlet of the dry filter tank 4. And a third air port of the first three-way valve 5-1 is connected with a chimney and is used for exhausting waste gas in an emergency manner in case of failure. And a third air port of the first three-way valve 5-1 is connected with a chimney and is used for exhausting waste gas in an emergency manner in case of failure. The valve group comprises a first flap valve 2-1, a second flap valve 2-2, a third flap valve 2-3, a fourth flap valve 2-4, a fifth flap valve 2-5, a sixth flap valve 2-6, a seventh flap valve 2-7, an eighth flap valve 2-8, a ninth flap valve 2-9, a tenth flap valve 2-10, an eleventh flap valve 2-11, a twelfth flap valve 2-12, a thirteenth flap valve 2-13, a fourteenth flap valve 2-14, a fifteenth flap valve 2-15, a sixteenth flap valve 2-16, a seventeenth flap valve 2-17, an eighteenth flap valve 2-18 and a nineteenth flap valve 2-19. An output port of the dry-type filter box 4 is connected with one end of the second flap valve 2-2, the fourth flap valve 2-4 and the sixth flap valve 2-6. The other ends of the second flap valve 2-2, the fourth flap valve 2-4 and the sixth flap valve 2-6 are respectively connected with the waste gas inlets of the first composite treatment device 8, the second composite treatment device 9 and the third composite treatment device 10.
The air inlet of the cooling draught fan 1-4 is connected with the external environment; and an air outlet of the cooling induced draft fan 1-4 is connected with one end of a fifteenth flap valve 2-15, a sixteenth flap valve 2-16 and a seventeenth flap valve 2-17. The other ends of the fifteenth flap valve 2-15, the sixteenth flap valve 2-16 and the seventeenth flap valve 2-17 are respectively connected with the cooling inlets of the first composite treatment device 8, the second composite treatment device 9 and the third composite treatment device 10. The purification air outlets of the first composite treatment device 8, the second composite treatment device 9 and the third composite treatment device 10 are respectively connected with one ends of the eighth flap valve 2-8, the tenth flap valve 2-10 and the twelfth flap valve 2-12. The other ends of the eighth flap valve 2-8, the tenth flap valve 2-10 and the twelfth flap valve 2-12 are connected to the air inlet of the main exhaust fan 1-2. The air outlet of the main exhaust fan 1-2 is communicated with a chimney for discharging outwards. One end of the fourteenth flap valve 2-14, one end of the eighteenth flap valve 2-18 and one end of the nineteenth flap valve 2-19 are respectively connected with the purification air outlets of the first composite treatment device 8, the second composite treatment device 9 and the third composite treatment device 10. The other ends of the fourteenth flap valve 2-14, the eighteenth flap valve 2-18 and the nineteenth flap valve 2-19 are connected with the air inlet of the main desorption fan 1-3. The air outlet of the desorption main fan 1-3 is connected with the input port of the flame retardant device 3 through a thirteenth flap valve 2-13. The output port of the flame retardant device 3 is connected with the input port of the heater 11; the output port of the heater 11 is connected to the first vent port of the second three-way valve 5-2 through the mass flow meter 6. The heater 11 can heat the gas passing through itself to form a hot gas flow. A second vent of the second three-way valve 5-2 is connected with one end of the first flap valve 2-1, one end of the third flap valve 2-3 and one end of the fifth flap valve 2-5 and an output port of the dry-type filter box 4. And a third air port of the second three-way valve 5-2 is connected with an air inlet of the waste gas induced draft fan 1-1. The other ends of the first flap valve 2-1, the third flap valve 2-3 and the fifth flap valve 2-5 are respectively connected with desorption air inlets of a first composite treatment device 8, a second composite treatment device 9 and a third composite treatment device 10. An ozone outlet of the ozone generator 7 is connected with one end of the seventh flap valve 2-7, the ninth flap valve 2-9 and the eleventh flap valve 2-11. The other ends of the seventh flap valve 2-7, the ninth flap valve 2-9 and the eleventh flap valve 2-11 are respectively connected with the ozone inlets of the first composite treatment device 8, the second composite treatment device 9 and the third composite treatment device 10.
The mass flow meter 6 monitors the exhaust gas after being degraded. If the emission standard is met, the waste gas is discharged to a chimney through the second three-way valve 5-2 and the fourteenth flap valve 2-14, or enters the molecular sieve rotating wheels of the first composite treatment device 8, the second composite treatment device 9 and the third composite treatment device 10 for reutilization through the second three-way valve 5-2, the first flap valve 2-1, the third flap valve 2-3 and the fifth flap valve 2-5. The chimney is connected with the external environment and used for outputting the purified gas. And if the tail gas does not reach the emission standard, the tail gas enters the first composite treatment device, the second composite treatment device and the third composite treatment device respectively through the second flap valve 2-2, the fourth flap valve 2-4 and the sixth flap valve 2-6 to be subjected to adsorption concentration again, and the cyclic treatment is carried out until the tail gas reaches the emission standard.
The invention adopts a three-gas path pipeline, and when a molecular sieve regeneration area works, hot gas flows respectively enter a first composite treatment device, a second composite treatment device and a third composite treatment device from a first flap valve, a third flap valve and a fifth flap valve. When the molecular sieve cooling area works, cold air flows respectively enter the first composite treatment device, the second composite treatment device and the third composite treatment device from the first flap valve, the third flap valve and the fifth flap valve.
The dry-type filter box 4 is internally provided with a primary filter, a medium filter and a high-efficiency filter which are arranged in sequence. The primary filter, the intermediate filter and the high-efficiency filter all adopt quick-release aluminum frame filter bags, and the weight is easy to replace. Wherein, the filter bag of the primary filter is made of filter cotton material, and the filtering grain size is more than or equal to 5 μm. The filter bag of the medium-efficiency filter is made of non-woven fabrics, and the filtering particle size is 1-5 mu m. The filter bag of the high-efficiency filter is made of glass fiber materials, and the filtering particle size is 0.1-1 mu m. Pressure difference meters are led out from the input port of the dry type filter box, between any two filters and the output port of the dry type filter box, so that the condition of pressure difference between two ends of the filter box can be monitored, and an operator is reminded to replace the filter. The filtering speed of each filter bag is 1-1.5 m/s, and the empty tower flow speed of the box body is 2-3 m/s.
The signal output line of each pressure difference meter and each flap valve in the valve group are connected with the controller; motors in the waste gas draught fan 1-1, the main exhaust fan 1-2 and the desorption main fan 1-3 are all connected with a controller through motor drivers. The controller adopts PLC. Therefore, the whole treatment process is controlled by a PLC automatic control system, and the PLC automatic control system consists of a programming system, an electric control cabinet (comprising a touch screen), an electric flap valve and a pressure sensor. The operation in-process is through controlling the electronic flap valve of waste gas business turn over pipeline, and three identical composite processing device realizes going on in turn, and 24 hours circulation alternate work, VOCs in the high-efficient purification waste gas, the gaseous discharge up to standard of chimney of passing through of after-treatment at last. The parameter adsorption time is controlled to be 1-2 h, and the desorption time is determined by the air inlet concentration and the desorption air quantity and is generally more than 0.5 h.
The specific treatment process of the volatile organic compound composite treatment device is carried out according to the following steps:
step one, the PLC is used for automatic control, the induced draft fan is started, organic waste gas enters the treatment system and enters the dry filter 4 through the induced draft fan, and particulate matters are removed.
And step two, opening the second flap valve and the eighth flap valve, enabling the first composite treatment device to enter an adsorption state, enabling the organic waste gas output from the dry filter 4 to enter the first composite treatment device through the second flap valve, and enabling an adsorption unit of the first composite treatment device to adsorb and concentrate organic pollutants in the VOCs waste gas. The tail gas after the organic pollutants are adsorbed is subjected to a composite emission standard and is discharged through a main exhaust fan 1-2 and a chimney. The whole adsorption concentration process is controlled within 1-2 h.
And step three, after the adsorption unit in the first composite treatment device is saturated (namely after 1-2 hours), automatically controlling by using a PLC (programmable logic controller), opening the first flap valve, the seventh flap valve and the fourteenth flap valve, closing the second flap valve, opening the desorption fans 1-3 and the ozone generator 7, and enabling the first composite treatment device to enter a desorption decomposition state. Under the suction force generated by the desorption main fan 1-3, airflow entering a regeneration area of an adsorption unit of the first composite treatment device through a thirteenth flap valve, the flame retardant device 3, the heater 11, the mass flow meter 6 and the first flap valve 2-1 is formed; the gas flow is heated by a heater 11, and organic matters are desorbed from the adsorption unit and then enter the ozone catalytic oxidation unit along with the gas flow, so that the VOCs waste gas is concentrated to a degree of 5-20 times. Ozone generated by the ozone generator 7 enters an ozone catalytic oxidation unit of the first composite treatment device; the ozone catalytic oxidation unit carries out catalytic oxidation on the organic pollutants, so that the organic pollutants are degraded into carbon dioxide and water vapor. The retention time of the tail gas after adsorption concentration in the ozone catalytic oxidation unit is 10-15 s. The air flow rate of the ozone catalytic oxidation unit was set to 4L/min. Tail gas output by the ozone catalytic oxidation unit passes through a desorption main fan 1-3 and a mass flow meter 6; the mass flow meter 6 detects the tail gas after catalytic oxidation, and if the tail gas reaches the emission standard, the tail gas is discharged to a chimney through the eighth flap valve 2-8; otherwise, the tail gas is input into the first composite treatment device again through the first flap valve 2-1 or is conveyed to the input port of the waste gas induced draft fan 1-1 through the first three-way valve 5-1.
Meanwhile, the fourth flap valve, the tenth flap valve and the eighteenth flap valve (providing a gas source of hot gas flow) are opened, and the second composite treatment device enters an adsorption state to adsorb the VOCs waste gas output by the dry filter 4.
And step four, after the adsorption unit in the second composite treatment device is saturated (namely after 1-2 hours), automatically controlling by using a PLC, opening a third flap valve and a ninth flap valve, closing a fourth flap valve, enabling the second composite treatment device to enter a desorption decomposition state, and carrying out catalytic oxidation on the organic pollutants adsorbed in the second composite treatment device.
Meanwhile, the sixth flap valve and the twelfth flap valve are opened, and the third composite treatment device enters an adsorption state to adsorb VOCs waste gas output by the dry filter 4. Opening a fifteenth flap valve and a fourteenth flap valve, closing the first flap valve, the seventh flap valve and the eighth flap valve, enabling the first composite treatment device to enter a cooling state, starting a cooling induced draft fan 1-4, and introducing cold air from the external environment to flow to an adsorption unit of the first composite treatment device to reduce the temperature in the first composite treatment device; the airflow with the increased temperature output by the first composite treatment device is converged into an air inlet of the desorption fan 1-3, so that the energy consumption is reduced; after cooling for 0.5h, the first combined treatment apparatus recovered its original adsorption capacity.
And step five, the PLC controls the first composite treatment device, the second composite treatment device and the third composite treatment device to be circularly switched among the adsorption state, the desorption decomposition state and the cooling state, so that one composite treatment device is in the adsorption state at any moment, and 24-hour continuous treatment of the VOCs waste gas is realized. The temperature of the whole composite device is controlled to be 0-100 ℃, the system is automatically controlled, the single key is started, the operation is simple, the temperature of each unit can be adjusted by matching with a human-computer interface, and the treatment effect of VOCs can reach more than 95%.
In addition, the whole process has operation protection measures: 1. when the follow-up device can not normally operate, the exhaust gas can be emptied by manually switching the first three-way valve 5-1, so that the exhaust gas in a workshop can be smoothly discharged, the accumulation of VOCs in the workshop is avoided, and the influence on the health of workers due to overhigh concentration is avoided. 2. The dry-type filter box and the adsorption device are both provided with differential pressure meters, so that the filter bag or the adsorption/catalyst is prevented from being blocked to influence the normal operation of the whole process.
The effect of the present invention on the treatment of VOCs waste gas is illustrated by the following experiment:
in a certain pharmaceutical manufacturing enterprise in Zhejiang, the tail gas is dried, and even if the tail gas is sprayed by tertiary alkali, the odor and the peculiar smell are still obvious. The invention is adopted to carry out field experiments; experimental results prove that the odor of the VOCs waste gas is obviously removed, the odor can not be smelled basically at the discharge port of the experimental device, and the odor dimensionless numerical value is less than 300 through three-party detection.
The samples to be tested were tested using Shimadzu GCMS-TQ8050 GC-MS and manual solid phase microextraction, and subjected to library search qualitative analysis using NIST14 standard mass library. The analysis results are shown in FIG. 2. In fig. 2, curve a corresponds to the case of drying only the tail gas, and curve B corresponds to the case after being processed by the technical solution described in the present invention. As can be seen from fig. 2, the main substances of the drying tail gas are toluene, m-and p-bromotoluene, 3-bromo-2, 2-dimethyl-1-propanol, naphthalene, 2, 4-dimethylbenzaldehyde, etc. The main substances of the tail gas treated by the adsorption-ozone catalytic oxidation composite device are toluene, m-bromotoluene, p-bromotoluene and the like. Shows that the component chromatographic peaks of the VOCs waste gas after being treated by the method and dried, such as toluene, m-bromotoluene, p-bromotoluene, 3-bromo-2, 2-dimethyl-1-propanol, 2, 4-dimethylbenzaldehyde and the like, are obviously reduced.
Claims (9)
1. Based onCatalytically oxidized VOCssThe combined treatment system comprises a waste gas induced draft fan (1-1), a main exhaust fan (1-2), a desorption main fan (1-3), a cooling induced draft fan (1-4), a heater (11) and three combined treatment devices; the method is characterized in that: the three composite treatment devices have the same structure and respectively comprise an adsorption unit and an ozone catalytic oxidation unit; the output port of the adsorption unit is connected with the input port of the ozone catalytic oxidation unit; the adsorption unit adsorbs VOCs waste gas; catalysis is arranged in the ozone catalytic oxidation unit, and VOCs waste gas is subjected to catalytic oxidation decomposition under the condition of inputting ozone;
the three composite treatment devices are provided with five air vents which are respectively a waste gas inlet, a desorption inlet, a cooling inlet, an ozone inlet and a purification air outlet; the waste gas inlet, the desorption inlet and the cooling inlet are connected to the input port of the adsorption unit; the ozone inlet is connected to an ozone supply port of the ozone catalytic oxidation unit; the output port of the ozone catalytic oxidation unit is connected to the purification air outlet; the waste gas inlets of the three composite treatment devices are connected to a VOCs waste gas conveying pipeline; the air outlets of the cooling induced draft fans (1-4) are connected to the cooling inlets of the three composite treatment devices; the purification air outlets of the three composite treatment devices are connected to a chimney through three valves and connected to the air inlet of a desorption main fan (1-3) through the other three valves; the air outlet of the main desorption fan (1-3) is connected to desorption air inlets of the three composite treatment devices through a heater (11) and a valve; an ozone outlet of the ozone generator (7) is connected to ozone inlets of the three composite treatment devices; the air outlets of the cooling draught fans (1-4) are connected to the cooling inlets of the three composite treatment devices.
2. A VOC based on catalytic oxidation according to claim 1sA composite processing system, characterized by: the composite treatment device has three working states, namely an adsorption state, a desorption decomposition state and a cooling state; in the adsorption state, VOCs waste gas is input from a waste gas inlet, and is output from a purified gas outlet after organic pollutants are removed in the adsorption unit; under the desorption decomposition state, hot air flow is input from the desorption inlet, so that organic pollutants in the adsorption unit are separated, and the VOCs waste gas is realizedConcentrating; the concentrated VOCs waste gas enters an ozone catalytic oxidation unit; ozone is input into the ozone catalytic oxidation unit from the ozone inlet, and the ozone catalytic oxidation unit carries out catalytic oxidation decomposition on the VOCs waste gas under the action of the ozone and the catalyst; in the cooling state, cold air flow is input from the cooling inlet, so that the temperature of the adsorption unit is reduced until the adsorption unit can adsorb the VOCs waste gas again.
3. The system of claim 1 for the combined treatment of VOCs based on catalytic oxidation, wherein: the catalyst adopted in the ozone catalytic oxidation unit selects three metal oxide particles with different crystal forms as carriers, and adopts a supersaturated impregnation method to prepare the MnOx-CeOx-LaOx catalyst.
4. The system of claim 3, wherein the system further comprises: the crystal forms of the three metal oxide particles are alpha crystal forms, beta crystal forms and gamma crystal forms respectively; the mass ratio of the alpha, beta and gamma crystal forms of the metal oxide is 3:4: 3.
5. The system of claim 1 for the combined treatment of VOCs based on catalytic oxidation, wherein: a mass flow meter (6), a flame arrester (3) and a second three-way valve (5-2) are also arranged between the air outlet of the main desorption fan (1-3) and the desorption air inlets of the three composite treatment devices.
6. The system of claim 1 for the combined treatment of VOCs based on catalytic oxidation, wherein: and a waste gas draught fan (1-1) and a dry type filter box (4) which are sequentially connected in series are arranged between the VOCs waste gas conveying pipeline and the three composite treatment devices.
7. The system of claim 6, wherein the system further comprises: the dry-type filter box (4) is internally provided with a primary filter, a medium-efficiency filter and a high-efficiency filter which are sequentially arranged; the primary filter, the intermediate filter and the high-efficiency filter all adopt quick-release aluminum frame filter bags; wherein, the filter bag of the primary filter is made of filter cotton material, and the filtering grain size is more than or equal to 5 μm; the filter bag of the medium-efficiency filter is made of non-woven fabrics, and the filtering particle size is 1-5 mu m; the filter bag of the high-efficiency filter is made of glass fiber, and the filtering particle size is 0.1-1 mu m; pressure difference meters are led out from the input port of the dry type filter box, between any two filters and the output port.
8. The system of claim 6, wherein the system further comprises: a first three-way valve (5-1) is arranged between the waste gas induced draft fan (1-1) and the dry type filter box (4); the first vent of the first three-way valve (5-1) is connected; a second vent of the first three-way valve (5-1) is connected with an input port of the dry type filter box (4); a third air port of the first three-way valve (5-1) is connected with a chimney; when a fault occurs, the VOCs waste gas is emptied by switching the first three-way valve.
9. A VOC based on catalytic oxidation as claimed in claim 2sA processing method for a composite processing system, comprising: step one, defining three composite processing devices as a first composite processing device, a second composite processing device and a third composite processing device respectively; the waste gas inlet and the purified gas outlet of the first composite treatment device are opened and enter an adsorption state, and the adsorption unit of the first composite treatment device adsorbs and concentrates organic pollutants in the input VOCs waste gas;
step two, when the adsorption unit in the first composite treatment device is saturated, the first composite treatment device enters a desorption decomposition state; a heater (11) heated by the heater (11) enters the adsorption unit of the first composite treatment device from the desorption inlet of the first composite treatment device, so that the organic matters adsorbed in the first composite treatment device are desorbed and enter the ozone catalytic oxidation unit along with the air flow; ozone generated by the ozone generator (7) enters an ozone catalytic oxidation unit of the first composite treatment device; the ozone catalytic oxidation unit carries out catalytic oxidation on the organic pollutants; meanwhile, the second composite treatment device enters an adsorption state;
step three, when the adsorption unit in the second composite treatment device is saturated, the second composite treatment device enters a desorption decomposition state; the third composite treatment device enters an adsorption state; the first composite treatment device enters a cooling state, and a cooling induced draft fan (1-4) introduces cold air flow from the external environment to an adsorption unit of the first composite treatment device, so that the temperature in the first composite treatment device is reduced, and the original adsorption capacity is recovered; the airflow with the increased temperature output by the first composite treatment device is converged into a second composite treatment device in a desorption decomposition state, so that the energy consumption is reduced;
and step four, circularly switching the first composite treatment device, the second composite treatment device and the third composite treatment device among an adsorption state, a desorption decomposition state and a cooling state, so that one composite treatment device is in the adsorption state at any moment.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110372527.7A CN113499683B (en) | 2021-04-07 | 2021-04-07 | VOC (volatile organic compound) based on catalytic oxidation s Composite processing system and method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110372527.7A CN113499683B (en) | 2021-04-07 | 2021-04-07 | VOC (volatile organic compound) based on catalytic oxidation s Composite processing system and method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN113499683A true CN113499683A (en) | 2021-10-15 |
| CN113499683B CN113499683B (en) | 2022-12-09 |
Family
ID=78009197
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110372527.7A Active CN113499683B (en) | 2021-04-07 | 2021-04-07 | VOC (volatile organic compound) based on catalytic oxidation s Composite processing system and method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113499683B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115957574A (en) * | 2023-02-20 | 2023-04-14 | 西安宝昱环境技术有限公司 | Be applied to interior low concentration exhaust-gas treatment equipment of CCL copper-clad plate factory gluing machine tower district |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111467885A (en) * | 2020-03-09 | 2020-07-31 | 浙江工业大学 | VOCs adsorption-plasma catalytic regeneration device and treatment system and process |
| CN113274840A (en) * | 2021-05-18 | 2021-08-20 | 浙江菲达环保科技股份有限公司 | Device and method for treating VOCs waste gas through activated carbon adsorption high-temperature desorption-catalytic oxidation |
-
2021
- 2021-04-07 CN CN202110372527.7A patent/CN113499683B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111467885A (en) * | 2020-03-09 | 2020-07-31 | 浙江工业大学 | VOCs adsorption-plasma catalytic regeneration device and treatment system and process |
| CN113274840A (en) * | 2021-05-18 | 2021-08-20 | 浙江菲达环保科技股份有限公司 | Device and method for treating VOCs waste gas through activated carbon adsorption high-temperature desorption-catalytic oxidation |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115957574A (en) * | 2023-02-20 | 2023-04-14 | 西安宝昱环境技术有限公司 | Be applied to interior low concentration exhaust-gas treatment equipment of CCL copper-clad plate factory gluing machine tower district |
Also Published As
| Publication number | Publication date |
|---|---|
| CN113499683B (en) | 2022-12-09 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| KR101143278B1 (en) | Air cleaner having regenerative filter, and method for regenerative of air cleaner filter | |
| CN204247047U (en) | Organic exhaust gas adsorption concentrates catalytic combustion and low-temperature plasma coupling purification system | |
| CN103920362A (en) | Exhaust gas treatment device and method by virtue of online desorption and degradation | |
| CN111467885B (en) | A volatile organic compound treatment system and process | |
| JP2004351312A (en) | Method and apparatus for regenerating activated carbon and air purifying system with the activated carbon incorporated | |
| CN105944500A (en) | Fixed bed type honeycomb VOCs adsorption and desorption device and method | |
| KR102136290B1 (en) | Low Energy Consumption Concentrating Rotor For Treating Malodor And VOCs Gases, And Treating System Comprising The Same | |
| CN106731481A (en) | A kind of activated carbon cyclone adsorbing processes the method and apparatus of VOC waste gas | |
| CN110394020B (en) | A nitrogen centralized desorption system for treating waste activated carbon containing VOCs | |
| CN113499683B (en) | VOC (volatile organic compound) based on catalytic oxidation s Composite processing system and method | |
| CN205760467U (en) | Fixed-bed type cellular VOCs adsorption/desorption device | |
| CN209302475U (en) | A kind of movable type VOC desorption purification device | |
| CN113719842B (en) | VOCs processing system of high-efficient heat recovery | |
| CN101322916A (en) | Sulfur-containing compound gas purification filter material device and method and catalyst adsorption material used by same | |
| CN110801706B (en) | Distributed processing device and method for volatile organic compounds | |
| CN211011697U (en) | Indoor Gas Purification Device Using Heterogeneous Advanced Oxidation of Hydrogen Peroxide | |
| CN210057812U (en) | Large-air-volume organic waste gas treatment system | |
| CN109107385B (en) | A VOCs gas treatment system | |
| CN215939499U (en) | Zeolite runner organic waste gas purification device | |
| CN202387370U (en) | Low-concentration volatile organic compound purification device in the environment | |
| CN108745328B (en) | Regeneration method of volatile organic pollutant adsorbent | |
| CN216321101U (en) | A system for enriching and purifying volatile organic waste gas and coupling with ironmaking | |
| CN211725246U (en) | VOCs adsorbs-catalytic combustion system | |
| CN214389519U (en) | VOCs adsorbs concentrated clean system | |
| CN210674789U (en) | Organic waste gas honeycomb zeolite adsorption concentration catalytic purification device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |