CN111185073A - Method for improving efficiency of low-temperature plasma treatment of VOCs and malodorous gas by regulating humidity - Google Patents
Method for improving efficiency of low-temperature plasma treatment of VOCs and malodorous gas by regulating humidity Download PDFInfo
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- CN111185073A CN111185073A CN201811350211.2A CN201811350211A CN111185073A CN 111185073 A CN111185073 A CN 111185073A CN 201811350211 A CN201811350211 A CN 201811350211A CN 111185073 A CN111185073 A CN 111185073A
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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
- B01D53/32—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 electrical effects other than those provided for in group B01D61/00
- B01D53/323—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 electrical effects other than those provided for in group B01D61/00 by electrostatic effects or by high-voltage electric fields
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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
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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
- B01D53/38—Removing components of undefined structure
- B01D53/44—Organic components
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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
- B01D53/46—Removing components of defined structure
- B01D53/66—Ozone
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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
- B01D53/46—Removing components of defined structure
- B01D53/72—Organic compounds not provided for in groups B01D53/48 - B01D53/70, e.g. hydrocarbons
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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
- B01D53/75—Multi-step processes
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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
- B01D2259/818—Employing electrical discharges or the generation of a plasma
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Abstract
The invention discloses a method for improving the efficiency of treating VOCs and malodorous gas by low-temperature plasma by regulating and controlling humidity, which comprises the following steps: firstly, determining a proper air inlet humidity range according to the type of the selected low-temperature plasma and the components for treating the waste gas; then, adjusting the inlet air humidity by using a humidity regulator to enable the inlet air humidity to be in the determined inlet air humidity range; and (4) delivering the waste gas subjected to humidity adjustment into a low-temperature plasma unit for degradation, and discharging after degradation. The invention utilizes the humidity regulator to regulate the air inlet humidity of the low-temperature plasma equipment, so that the optimum treatment humidity of the component waste gas is achieved, the degradation efficiency of waste gas pollutants is improved, and the pollutant emission is reduced. Compared with the method for treating the waste gas by using the low-temperature plasma, the method can improve the treatment efficiency of the waste gas pollutants by 10-30 percent.
Description
Technical Field
The invention relates to a method for treating VOCs and malodorous gas by adopting low-temperature plasma, in particular to a method for improving the efficiency of treating VOCs and malodorous gas by adopting low-temperature plasma by regulating and controlling humidity.
Background
VOCs and malodorous gases are one of the important sources of exhaust gas pollution. Recently, a series of latest emission standards (such as GB 31571-2015) related to VOCs and malodorous gases in China put forward stricter requirements on the emission and treatment of VOCs and malodorous gases.
The low-temperature plasma is already applied to VOCs and malodorous gas treatment, and has the advantages of low energy consumption, strong adaptability, high treatment speed and the like. The ionization of water molecules in low-temperature plasma to generate hydroxyl radicals (OH) and the like is one of important oxidants in the low-temperature plasma to treat waste gas, and plays an important role in degrading pollutants. Under different humidities, the degradation efficiency of low-temperature plasma to different component pollutants is different, but because the inlet air humidity of industrial waste gas is not controllable or the inlet air humidity is not the optimum humidity, the degradation efficiency of low-temperature plasma to pollutants in waste gas is not optimal, the emission of treated waste gas is difficult to ensure to reach the standard, and the application of low-temperature plasma in the treatment of VOCs and malodorous gas is restricted.
Disclosure of Invention
Based on the technical problems, the invention provides a method for improving the efficiency of treating VOCs and malodorous gases by low-temperature plasma by regulating and controlling humidity.
The technical solution adopted by the invention is as follows:
a method for improving the efficiency of low-temperature plasma treatment of VOCs and malodorous gases by regulating humidity comprises the following steps:
firstly, determining a proper air inlet humidity range according to the type of the selected low-temperature plasma and the components for treating the waste gas; then, adjusting the inlet air humidity by using a humidity regulator to enable the inlet air humidity to be in the determined inlet air humidity range; and (4) delivering the waste gas subjected to humidity adjustment into a low-temperature plasma unit for degradation, and discharging after degradation.
In the above steps, the humidity regulator may be a dehumidifier or a humidifier.
In the above steps, the relative humidity of the intake air and the exhaust gas is controlled by the humidity regulator to be 10 to 70%, and more preferably 20 to 50%.
Preferably, the inlet and the outlet of the humidity regulator are respectively provided with a relative humidity sensor, the relative humidity sensors are connected with the controller, and the controller adjusts the operating power or the rotating speed of the humidity regulator according to the monitoring result of the relative humidity sensors.
The dehumidifier is preferably a freeze dehumidifier, a pressure swing dehumidifier or a rotary dehumidifier, and the humidifier is preferably an ultrasonic humidifier, a direct evaporation type humidifier, an electric heating type humidifier or a cold mist humidifier.
The low-temperature plasma unit comprises a low-temperature plasma reactor, a low-temperature plasma generator and a low-temperature plasma high-voltage power supply.
The low-temperature plasma reactor is preferably in the form of a wire barrel reactor, a shaft barrel reactor or a spacer reactor.
The discharge form of the low-temperature plasma generator is preferably any one of corona discharge, single dielectric barrier discharge, double dielectric barrier discharge, glow discharge, radio frequency discharge, sliding arc discharge and jet flow discharge.
The low-temperature plasma high-voltage power supply is preferably any one or any two combination of a high-voltage alternating-current power supply, a high-voltage direct-current power supply and a high-voltage pulse power supply.
In the above steps, after the low-temperature plasma unit degrades the waste gas, the undecomposed ozone is degraded by the ozone decomposition tower, and finally the waste gas is discharged up to the standard.
The beneficial technical effects of the invention are as follows:
the invention utilizes the humidity regulator to regulate the air inlet humidity of the low-temperature plasma equipment, so that the optimum treatment humidity of the component of waste gas is achieved, the degradation efficiency of waste gas pollutants is improved, and the pollutant emission is reduced. Compared with the method which only uses low-temperature plasma to treat the waste gas, the method of the invention can improve the treatment efficiency of waste gas pollutants by 10-30%.
Drawings
The invention will be further described with reference to the following detailed description and drawings:
fig. 1 is a schematic diagram of a structural principle of an implementation device related to the method of the present invention.
Detailed Description
The invention provides a method for improving the efficiency of treating VOCs and malodorous gas by low-temperature plasma by regulating and controlling humidity, which comprises the following steps: firstly, inquiring relevant documents and technical parameters to determine a proper air inlet humidity range according to the type of the selected low-temperature plasma and the components of the treated waste gas; then, adjusting the inlet air humidity by using a humidity regulator to enable the inlet air humidity to be in the determined inlet air humidity range; and (3) the waste gas after humidity adjustment is sent into a low-temperature plasma unit for degradation, and after the degradation is finished, the undecomposed ozone is degraded by an ozone decomposition tower, so that the waste gas is discharged up to the standard.
The steps are as follows: the relative humidity of the intake air exhaust gas is preferably controlled to 10 to 70%, more preferably 20 to 50%, by a humidity regulator.
The humidity regulator can adopt a dehumidifier or a humidifier. The dehumidifier can be a freezing dehumidifier, a pressure swing dehumidifier or a rotary dehumidifier, and the humidifier can be an ultrasonic humidifier, a direct evaporation type humidifier, an electric heating type humidifier or a cold mist humidifier.
The steps are as follows: all be provided with relative humidity sensor at humidity conditioner's business turn over mouth department, humidity conditioner's operating power or rotational speed are adjustable, and relative humidity sensor is connected with controller etc. and the controller adjusts humidity conditioner's operating power or rotational speed according to relative humidity sensor's monitoring result to adjust dehumidification volume or humidification volume.
The low-temperature plasma unit comprises a low-temperature plasma reactor, a low-temperature plasma generator and a low-temperature plasma high-voltage power supply. Wherein the low-temperature plasma reactor is in the form of a wire barrel type reactor, a shaft barrel type reactor or a spacing type reactor. The discharge form of the low-temperature plasma generator is any one of corona discharge, single-dielectric barrier discharge, double-dielectric barrier discharge, glow discharge, radio frequency discharge, sliding arc discharge and jet discharge. The low-temperature plasma high-voltage power supply is any one or any combination of a high-voltage alternating current power supply, a high-voltage direct current power supply and a high-voltage pulse power supply.
Fig. 1 is a schematic diagram of the structural principle of an implementation device related to the method of the invention, and as shown in the figure, the implementation device comprises an inlet total hydrocarbon analyzer 1, an exhaust gas flowmeter 2, a buffer tank 3, a humidity regulator 4, an exhaust gas electric butterfly valve 5, a low-temperature plasma unit 6, a fan 7, an ozone decomposition tower 8 and an outlet total hydrocarbon analyzer 9. The exhaust gas transmitted through the exhaust gas conveying pipeline is firstly detected by the inlet total hydrocarbon analyzer 1 for exhaust gas components and the like, then the flow is measured by the exhaust gas flowmeter 2, and the operation power or the rotating speed of the humidity regulator 4 is set or regulated according to the exhaust gas components, the flow and the like. The exhaust gas is buffered in a buffer tank 3 before entering the humidity regulator 4. The exhaust gas adjusted by the humidity regulator 4 enters the low-temperature plasma unit 6 for treatment, and the exhaust gas flow can be properly adjusted through the exhaust gas electric butterfly valve 5 between the two. The waste gas treated by the low-temperature plasma unit 6 enters an ozone decomposition tower 8 through the conveying of a fan 7, undecomposed ozone is degraded through the ozone decomposition tower 8, and finally the waste gas is discharged after reaching the standard after being detected to be qualified by an outlet total hydrocarbon analyzer 9.
In the operation process of the device, the exhaust gas treatment efficiency can reach the highest by continuously adjusting the inlet air humidity.
The invention is further illustrated by the following specific examples and comparative examples:
example 1
Organic volatile waste gas generated by a sewage treatment device of an oil refinery is taken for testing, and before the test, the content of benzene in the waste gas is 80 mg/Nm3The relative humidity of the waste gas is 98 percent, and the humidity of the waste gas is measured by a refrigeration dehumidifierReducing the benzene content to 30 percent, and then entering a low-temperature plasma reaction unit generator for degradation, wherein the benzene content is 4mg/Nm3The benzene removal rate reaches 95 percent.
Comparative example 1
The same organic waste gas as in example 1 was used for the experiment, and the content of benzene was 24mg/Nm after the waste gas was directly introduced into the low temperature plasma reaction unit generator without humidity regulator and degraded3The benzene removal rate was 70%.
Example 2
Taking the tail gas of a styrene butadiene rubber drying box of a certain chemical device for testing, wherein the content of non-methane total hydrocarbons in the waste gas is 1500mg/Nm3The relative humidity of the waste gas is 8 percent, the waste gas is increased to 30 percent through a direct evaporation type humidifier and then enters a low-temperature plasma reaction unit for degradation, and the concentration of non-methane total hydrocarbon is 90mg/Nm3The non-methane total hydrocarbon removal rate reaches 94 percent.
Comparative example 2
The same organic waste gas as that in example 2 was used for the experiment, and the concentration of non-methane hydrocarbons was 240mg/Nm after the waste gas directly entered the low temperature plasma reaction unit generator without humidity regulator and degraded3The non-methane total hydrocarbon removal was 84%.
Claims (10)
1. A method for improving the efficiency of low-temperature plasma treatment of VOCs and malodorous gases by regulating humidity is characterized by comprising the following steps:
firstly, determining a proper air inlet humidity range according to the type of the selected low-temperature plasma and the components of the treated waste gas; then, adjusting the inlet air humidity by using a humidity regulator to enable the inlet air humidity to be in the determined inlet air humidity range; and (4) delivering the waste gas subjected to humidity adjustment into a low-temperature plasma unit for degradation, and discharging after degradation.
2. The method according to claim 1, wherein the humidity is controlled to improve the efficiency of low-temperature plasma treatment of VOCs and malodorous gases, and the method comprises: the humidity regulator adopts a dehumidifier or a humidifier.
3. The method according to claim 1, wherein the humidity is controlled to improve the efficiency of low-temperature plasma treatment of VOCs and malodorous gases, and the method comprises: the relative humidity of the inlet air and the exhaust gas is controlled to be 10-70% by a humidity regulator.
4. The method according to claim 1, wherein the humidity is controlled to improve the efficiency of low-temperature plasma treatment of VOCs and malodorous gases, and the method comprises: the inlet and outlet of the humidity regulator are provided with relative humidity sensors, the relative humidity sensors are connected with the controller, and the controller adjusts the operating power or the rotating speed of the humidity regulator according to the monitoring result of the relative humidity sensors.
5. The method according to claim 2, wherein the humidity is controlled to improve the efficiency of low-temperature plasma treatment of VOCs and malodorous gases, and the method comprises: the dehumidifier adopts a freezing dehumidifier, a pressure swing dehumidifier or a rotary dehumidifier, and the humidifier adopts an ultrasonic humidifier, a direct evaporation type humidifier, an electric heating type humidifier or a cold mist humidifier.
6. The method according to claim 1, wherein the humidity is controlled to improve the efficiency of low-temperature plasma treatment of VOCs and malodorous gases, and the method comprises: the low-temperature plasma unit comprises a low-temperature plasma reactor, a low-temperature plasma generator and a low-temperature plasma high-voltage power supply.
7. The method according to claim 6, wherein the humidity is controlled to improve the efficiency of low-temperature plasma treatment of VOCs and malodorous gases, and the method comprises: the low-temperature plasma reactor is in the form of a wire barrel type reactor, a shaft barrel type reactor or a spacing type reactor.
8. The method according to claim 6, wherein the humidity is controlled to improve the efficiency of low-temperature plasma treatment of VOCs and malodorous gases, and the method comprises: the discharge form of the low-temperature plasma generator is any one of corona discharge, single-dielectric barrier discharge, double-dielectric barrier discharge, glow discharge, radio frequency discharge, sliding arc discharge and jet flow discharge.
9. The method according to claim 6, wherein the humidity is controlled to improve the efficiency of low-temperature plasma treatment of VOCs and malodorous gases, and the method comprises: the low-temperature plasma high-voltage power supply is any one or any combination of a high-voltage alternating-current power supply, a high-voltage direct-current power supply and a high-voltage pulse power supply.
10. The method according to claim 1, wherein the humidity is controlled to improve the efficiency of low-temperature plasma treatment of VOCs and malodorous gases, and the method comprises: after the low-temperature plasma unit degrades the waste gas, the unreacted ozone is degraded by the ozone decomposition tower, and finally the waste gas is discharged up to the standard.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201811350211.2A CN111185073A (en) | 2018-11-14 | 2018-11-14 | Method for improving efficiency of low-temperature plasma treatment of VOCs and malodorous gas by regulating humidity |
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| CN201811350211.2A CN111185073A (en) | 2018-11-14 | 2018-11-14 | Method for improving efficiency of low-temperature plasma treatment of VOCs and malodorous gas by regulating humidity |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112076597A (en) * | 2020-09-25 | 2020-12-15 | 浙大城市学院 | Low-temperature plasma multi-processing object experiment platform and processing method thereof |
| CN115228252A (en) * | 2021-04-23 | 2022-10-25 | 中国石油化工股份有限公司 | Low-temperature plasma organic waste gas treatment device and method |
| WO2023227172A1 (en) * | 2022-05-25 | 2023-11-30 | Continental Reifen Deutschland Gmbh | Method of offgas treatment |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112076597A (en) * | 2020-09-25 | 2020-12-15 | 浙大城市学院 | Low-temperature plasma multi-processing object experiment platform and processing method thereof |
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| CN115228252A (en) * | 2021-04-23 | 2022-10-25 | 中国石油化工股份有限公司 | Low-temperature plasma organic waste gas treatment device and method |
| WO2023227172A1 (en) * | 2022-05-25 | 2023-11-30 | Continental Reifen Deutschland Gmbh | Method of offgas treatment |
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