CN111111368A - Method for condensing and photocatalytic degradation of organic waste gas by two-stage method - Google Patents
Method for condensing and photocatalytic degradation of organic waste gas by two-stage method Download PDFInfo
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- CN111111368A CN111111368A CN201911275226.1A CN201911275226A CN111111368A CN 111111368 A CN111111368 A CN 111111368A CN 201911275226 A CN201911275226 A CN 201911275226A CN 111111368 A CN111111368 A CN 111111368A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/002—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by condensation
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- 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
- B01D53/005—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 heat treatment
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/007—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 irradiation
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/26—Drying gases or vapours
- B01D53/265—Drying gases or vapours by refrigeration (condensation)
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—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
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- 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
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2259/00—Type of treatment
- B01D2259/80—Employing electric, magnetic, electromagnetic or wave energy, or particle radiation
- B01D2259/804—UV light
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- 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
Abstract
The invention relates to a method for condensing and photocatalytic degrading organic waste gas by a two-stage method, which adopts a two-stage heat exchange method to reduce the temperature and the humidity of the organic waste gas and then adopts a photocatalytic method to remove Volatile Organic Compounds (VOC) in the organic waste gasS) And the harmless treatment of the organic waste gas is realized. The invention can effectively remove harmful substances in the waste gas, reduce the pollution degree of the waste gas to the air and improve the air quality; the waste gas is subjected to two-stage heat exchange, so that the humidity of the discharged gas is reduced, and the photocatalytic equipment and the photocatalyst are effectively protected; and the water vapor condensed water in the waste gas is discharged into a municipal sewage pipeline and reused after being purified, so that water resources are saved.
Description
Technical Field
The invention belongs to the technical field of industrial tail gas (organic waste gas) treatment, and particularly relates to a method for condensing and degrading organic waste gas by a two-stage method.
Background
The environmental management problem becomes an important problem which is expected by people and needs to be solved urgently in China.
Enterprises such as petrochemical industries often produce large amounts of organic waste gases (VOCs). If the VOCs are discharged into the natural environment, the environment is greatly polluted, the life quality of people is influenced, and the economic benefit of enterprises is reduced. The condensation adsorption integration technology has been widely used by people for recovering VOCs due to its characteristics of stability, safety and the like.
Common condensation and adsorption integration technologies include a condensation method and an absorption method. The condensation method is to directly introduce organic waste gas into a condenser, recover valuable organic matters through the actions and reactions of links such as adsorption, absorption, analysis, separation and the like, recover waste heat of the waste gas and purify the waste gas, so that the waste gas reaches the emission standard. However, the waste gas (containing water vapor and non-condensable gas) is cooled by using one-stage condensation, so that the waste heat cannot be well utilized and is directly discharged, and harmful components in the waste gas cannot be effectively removed, thereby causing air pollution; if one-section method is used for directly carrying out photocatalytic degradation after cooling, the photocatalytic system can be damaged due to high humidity of the discharged waste gas, the service life is influenced, and the operation cost is increased.
Therefore, the two-stage method is introduced to condense the waste gas, so that the heat can be effectively utilized, valuable components can be recovered, and the UV photocatalytic decomposition system can also effectively remove pollutants in the waste gas to further purify the gas.
Disclosure of Invention
The invention aims to provide a method for condensing and photocatalytic degrading organic waste gas by a two-stage method, so as to solve the problems that the prior art cannot well utilize waste heat and has low harmful substance removal efficiency.
The purpose of the invention is realized by the following technical scheme:
a method for condensing and photocatalytic degradation of organic waste gas by two-stage method is characterized in that the temperature and humidity of the organic waste gas are reduced by two-stage heat exchange method, and then the Volatile Organic Compounds (VOC) in the organic waste gas are removed by photocatalytic methodS) The harmless treatment of the organic waste gas is realized;
the organic waste gas includes: formaldehyde organic waste gas, benzene series organic waste gas such as benzene, toluene, xylene and the like, acetone and butanone organic waste gas, ethyl acetate waste gas, oil mist organic waste gas, furfural organic waste gas, styrene and acrylic acid organic waste gas, resin organic waste gas, additive organic waste gas and paint mist organic waste gas; the organic waste gas contains air, water vapor and volatile organic compounds.
More specifically, the invention relates to a method for condensing and photocatalytic degrading organic waste gas by a two-stage method, which comprises the following steps: (1) sending the organic waste gas into a first heat exchanger for heat exchange cooling, condensing part of water vapor into water and discharging to obtain waste gas A; (2) feeding the waste gas A into heating equipment to be heated to a certain temperature to obtain waste gas B; (3) then the waste gas B is sent into a second heat exchanger, and the temperature is continuously reduced and the water vapor is removed to obtain waste gas C; (4) and (3) conveying the waste gas C into a photocatalytic device, and removing volatile organic compounds in the waste gas C under the catalytic reaction of a photocatalyst so as to reach the emission standard.
Further, the first heat exchanger is a condensation tower, and a condensation medium is water; the second heat exchanger is VOCSThe gas condensation recovery device, the condensation medium is water; the photocatalytic equipment is a UV photocatalytic decomposition system.
Further, the temperature of the organic waste gas is 100-120 ℃; the temperature of the waste gas A is 70-90 ℃; the temperature of the waste gas B is 90-100 ℃; the temperature of the waste gas C is 60-70 ℃.
Further, the photocatalyst is TiO2TiO 2 nanoparticles2Or TiO2One or more of the following materials.
Further, the emission standard is the primary emission standard of GB 16297 Integrated emission Standard for atmospheric pollutants 1996.
The invention adopts two-stage heat exchange and adds a photocatalytic system to treat the waste gas, (1) harmful substances in the waste gas can be effectively removed, the pollution degree of the waste gas to the air is reduced, and the air quality is improved; (2) because the outlet water temperature of the condensed water after heat exchange is high, the condensed water can be added into a municipal heating system for centralized utilization, and the heat energy is effectively utilized; (3) the waste gas is subjected to two-stage heat exchange, so that the humidity of the discharged gas is reduced, the photocatalytic equipment and the photocatalyst are effectively protected, and the service life of the photocatalytic equipment and the photocatalyst is guaranteed; (4) and the water vapor condensed water in the waste gas is discharged into a municipal sewage pipeline and reused after being purified, so that water resources are saved.
Drawings
FIG. 1 is a schematic flow diagram of the present invention, wherein: 1-a first heat exchanger, 2-a heating device, 3-a second heat exchanger, 4-a photocatalytic device, 5-a municipal sewage treatment system and 6-a municipal heat supply system.
Detailed Description
It should be understood by those skilled in the art that the present embodiment is only for illustrating the present invention and is not to be used as a limitation of the present invention, and changes and modifications of the embodiment can be made within the scope of the claims of the present invention.
A method for condensing and photocatalytic degradation of organic waste gas by a two-stage method comprises the following steps: (1) sending the organic waste gas into a first heat exchanger 1 for heat exchange cooling, condensing part of water vapor into water and discharging to obtain waste gas A; (2) feeding the waste gas A into a heating device 2 to be heated to a certain temperature to obtain waste gas B; (3) then the waste gas B is sent into a second heat exchanger 3, and the temperature is continuously reduced and the water vapor is removed to obtain waste gas C; (4) and (3) sending the waste gas C into a photocatalytic device 4, and removing volatile organic compounds in the waste gas C under the catalytic reaction of a photocatalyst so as to reach the emission standard.
Further, in the first heat exchanger 1 and the second heat exchanger 3, the heated condensed water can be sent to a municipal heat supply system 6 for centralized utilization; the water vapor condensed water in the organic waste gas is discharged into a municipal sewage treatment system 5.
Example 1
(1) Feeding noncondensable waste gas containing ethanol (T110 deg.C, humidity 80.2%, ethanol content 16%) into a first heat exchanger for heat exchange cooling, condensing part of water vapor into water, and discharging to obtain waste gas A at 85 deg.C and humidity 65.7%; (2) feeding the waste gas A into a heating fan to be heated to 98 ℃ to obtain waste gas B; (3) the waste gas B is sent into a second heat exchangerContinuously cooling and removing water vapor to obtain waste gas C, wherein the temperature is 67 ℃, the humidity is reduced to 42.5 percent, the humidity is in accordance with the indoor humidity at normal temperature, and the photocatalytic system is not damaged; (4) the waste gas C is sent into a photocatalysis device, and photocatalyst nano TiO is adopted2Carrying out catalytic reaction to remove volatile organic ethanol, and finally reducing the ethanol content in the exhaust gas to 6%.
Example 2
(1) Conveying the noncondensable gas containing methane (T is 114 ℃, the humidity is 79.3%, the methane content is 32%) into a first heat exchanger for heat exchange cooling, condensing part of water vapor into water and discharging the water to obtain waste gas A, wherein the temperature is 77 ℃, and the humidity is 68.1%; (2) feeding the waste gas A into a heating fan to be heated to 90.2 ℃ to obtain waste gas B; (3) sending the waste gas B into a second heat exchanger, continuously cooling and removing water vapor to obtain waste gas C, wherein the temperature is 62 ℃, the humidity is reduced to 40.5%, the waste gas C meets the indoor humidity of the room temperature, and the photocatalytic system is not damaged; (4) the waste gas C is sent into a photocatalysis device, and a photocatalyst TiO is adopted2The graphene composite material is subjected to catalytic reaction, volatile organic matter methane in the graphene composite material is removed, and finally the methane content in the discharged gas is reduced to 10%.
Claims (8)
1. A method for condensing and photocatalytic degradation of organic waste gas by two-stage method is characterized in that the temperature and humidity of the organic waste gas are reduced by two-stage heat exchange method, and then the Volatile Organic Compounds (VOC) in the organic waste gas are removed by photocatalytic methodS) And the harmless treatment of the organic waste gas is realized.
2. The two-stage method for condensing and photocatalytically degrading an organic waste gas according to claim 1, wherein the organic waste gas comprises: formaldehyde organic waste gas, benzene series organic waste gas such as benzene, toluene, xylene and the like, acetone and butanone organic waste gas, ethyl acetate waste gas, oil mist organic waste gas, furfural organic waste gas, styrene and acrylic acid organic waste gas, resin organic waste gas, additive organic waste gas and paint mist organic waste gas; the organic waste gas contains air, water vapor and volatile organic compounds.
3. The two-stage method for condensing and photocatalytically degrading organic waste gas according to claim 1, comprising the steps of: (1) sending the organic waste gas into a first heat exchanger for heat exchange cooling, condensing part of water vapor into water and discharging to obtain waste gas A; (2) feeding the waste gas A into heating equipment to be heated to a certain temperature to obtain waste gas B; (3) then the waste gas B is sent into a second heat exchanger, and the temperature is continuously reduced and the water vapor is removed to obtain waste gas C; (4) and (3) conveying the waste gas C into a photocatalytic device, and removing volatile organic compounds in the waste gas C under the catalytic reaction of a photocatalyst so as to reach the emission standard.
4. The two-stage method for condensing and photocatalytically degrading organic waste gas according to claim 3, wherein the first heat exchanger is a condensing tower, and the condensing medium is water; the second heat exchanger is VOCSThe gas condensation recovery device, the condensation medium is water; the photocatalytic equipment is a UV photocatalytic decomposition system.
5. The two-stage method for condensing and photocatalytic degradation of organic waste gas according to claim 3, wherein the temperature of the organic waste gas is 100-120 ℃; the temperature of the waste gas A is 70-90 ℃; the temperature of the waste gas B is 90-100 ℃; the temperature of the waste gas C is 60-70 ℃.
6. The two-stage method for condensing and photocatalytically degrading organic waste gas according to claim 3, wherein the photocatalyst is TiO2TiO 2 nanoparticles2Or TiO2One or more of the following materials.
7. The two-stage method for condensing and photocatalytic degradation of organic waste gas according to claim 3, wherein the heated condensed water in the first heat exchanger and the second heat exchanger can be sent to a municipal heating system for centralized utilization; and discharging the water vapor condensed water in the organic waste gas into a municipal sewage treatment system.
8. The two-stage method for condensing and photocatalytic degradation of organic waste gas according to claim 3, wherein the emission standard is the first grade emission standard of GB 16297 and 1996 Integrated emission Standard for atmospheric pollutants.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201911275226.1A CN111111368A (en) | 2019-12-12 | 2019-12-12 | Method for condensing and photocatalytic degradation of organic waste gas by two-stage method |
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| CN201911275226.1A CN111111368A (en) | 2019-12-12 | 2019-12-12 | Method for condensing and photocatalytic degradation of organic waste gas by two-stage method |
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Cited By (2)
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| CN114939597A (en) * | 2022-05-27 | 2022-08-26 | 江苏省环境科学研究院 | Skid-mounted rapid emergency soil thermal desorption device |
| CN116196737A (en) * | 2023-03-11 | 2023-06-02 | 重庆清研理工智能控制技术研究院有限公司 | Organic matter vapor mixed tail gas heat recovery dehydration system and equipment |
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Application publication date: 20200508 |