CN108970363B - Interval type low-temperature plasma generator filled with ozone decomposer - Google Patents
Interval type low-temperature plasma generator filled with ozone decomposer Download PDFInfo
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- CBENFWSGALASAD-UHFFFAOYSA-N Ozone Chemical compound [O-][O+]=O CBENFWSGALASAD-UHFFFAOYSA-N 0.000 title claims abstract description 21
- 239000003795 chemical substances by application Substances 0.000 claims description 14
- 230000004888 barrier function Effects 0.000 claims description 9
- 238000005949 ozonolysis reaction Methods 0.000 claims description 9
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical group [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 5
- 239000002808 molecular sieve Substances 0.000 claims description 5
- URGAHOPLAPQHLN-UHFFFAOYSA-N sodium aluminosilicate Chemical compound [Na+].[Al+3].[O-][Si]([O-])=O.[O-][Si]([O-])=O URGAHOPLAPQHLN-UHFFFAOYSA-N 0.000 claims description 5
- 229910052799 carbon Inorganic materials 0.000 claims description 3
- 238000000354 decomposition reaction Methods 0.000 claims description 3
- 239000002184 metal Substances 0.000 claims 1
- 239000003344 environmental pollutant Substances 0.000 abstract description 17
- 239000002245 particle Substances 0.000 abstract description 17
- 231100000719 pollutant Toxicity 0.000 abstract description 17
- 230000015556 catabolic process Effects 0.000 abstract description 13
- 238000006731 degradation reaction Methods 0.000 abstract description 13
- 238000006243 chemical reaction Methods 0.000 abstract description 7
- 210000002381 plasma Anatomy 0.000 description 72
- UHOVQNZJYSORNB-UHFFFAOYSA-N Benzene Chemical compound C1=CC=CC=C1 UHOVQNZJYSORNB-UHFFFAOYSA-N 0.000 description 24
- 239000007789 gas Substances 0.000 description 17
- 238000012360 testing method Methods 0.000 description 14
- 238000000034 method Methods 0.000 description 11
- 239000002351 wastewater Substances 0.000 description 11
- 239000004215 Carbon black (E152) Substances 0.000 description 9
- 229930195733 hydrocarbon Natural products 0.000 description 9
- 150000002430 hydrocarbons Chemical class 0.000 description 9
- 229910052760 oxygen Inorganic materials 0.000 description 9
- 150000003254 radicals Chemical class 0.000 description 9
- 239000012855 volatile organic compound Substances 0.000 description 8
- 239000002912 waste gas Substances 0.000 description 8
- 210000004027 cell Anatomy 0.000 description 6
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 6
- 239000010815 organic waste Substances 0.000 description 6
- 230000000052 comparative effect Effects 0.000 description 5
- 230000000694 effects Effects 0.000 description 5
- 239000010865 sewage Substances 0.000 description 5
- 238000002347 injection Methods 0.000 description 4
- 239000007924 injection Substances 0.000 description 4
- 238000005215 recombination Methods 0.000 description 4
- 230000006798 recombination Effects 0.000 description 4
- 239000000126 substance Substances 0.000 description 4
- 238000002474 experimental method Methods 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 238000003491 array Methods 0.000 description 2
- 239000003054 catalyst Substances 0.000 description 2
- 230000000593 degrading effect Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000000746 purification Methods 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- 239000013543 active substance Substances 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010170 biological method Methods 0.000 description 1
- 230000003197 catalytic effect Effects 0.000 description 1
- 238000009841 combustion method Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 230000005684 electric field Effects 0.000 description 1
- 230000036541 health Effects 0.000 description 1
- 238000005338 heat storage Methods 0.000 description 1
- 239000002440 industrial waste Substances 0.000 description 1
- 230000002401 inhibitory effect Effects 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 230000010534 mechanism of action Effects 0.000 description 1
- 229910044991 metal oxide Inorganic materials 0.000 description 1
- 150000004706 metal oxides Chemical class 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 230000001699 photocatalysis Effects 0.000 description 1
- 238000007146 photocatalysis Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000010926 purge Methods 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 231100000331 toxic Toxicity 0.000 description 1
- 230000002588 toxic effect Effects 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
Classifications
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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
-
- 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
-
- 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
-
- 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
- B01D53/76—Gas phase processes, e.g. by using aerosols
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/46—Treatment of water, waste water, or sewage by electrochemical methods
- C02F1/4608—Treatment of water, waste water, or sewage by electrochemical methods using electrical discharges
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/72—Treatment of water, waste water, or sewage by oxidation
- C02F1/78—Treatment of water, waste water, or sewage by oxidation with ozone
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2257/00—Components to be removed
- B01D2257/70—Organic compounds not provided for in groups B01D2257/00 - B01D2257/602
- B01D2257/708—Volatile organic compounds V.O.C.'s
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2259/00—Type of treatment
- B01D2259/80—Employing electric, magnetic, electromagnetic or wave energy, or particle radiation
- B01D2259/818—Employing electrical discharges or the generation of a plasma
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
- Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
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- Oil, Petroleum & Natural Gas (AREA)
- Health & Medical Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Life Sciences & Earth Sciences (AREA)
- Water Supply & Treatment (AREA)
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Abstract
The invention relates to a gap-type low-temperature plasma generator filled with an ozone decomposer, which comprises a low-temperature plasma power supply, a low-temperature plasma discharge unit and a low-temperature plasma reactor, wherein two or more low-temperature plasma discharge units are inserted into the reactor and are distributed at intervals in the flowing direction of a medium, the low-temperature plasma separates the low-temperature plasma reactor into a non-discharge area and a discharge area, and the ozone decomposer is placed in the non-discharge area. The invention can improve O in the low-temperature plasma generator by placing ozone decomposer in the non-discharge area 3 The reaction probability of the active particles and pollutants is further improved, so that the degradation efficiency of the pollutants is further improved, and the generation probability of secondary pollutants is reduced.
Description
Technical Field
The invention relates to a low-temperature plasma generator for wastewater and waste gas treatment, in particular to a space-type low-temperature plasma generator filled with an ozone decomposer.
Background
Volatile Organic Compounds (VOCs) are a significant source of atmospheric pollutants. A large amount of VOCs are discharged into the atmosphere and NOx, SOx, O 3 And complicated physicochemical reactions occur, so that haze is generated, and serious harm is brought to human health. At present, conventional treatment methods of VOCs include an activated carbon adsorption method, an absorption method, a heat storage combustion method, a catalytic oxidation method, a biological method, a photocatalysis method and the like, but various adverse factors such as incomplete purification, high operation cost and the like generally exist. The method for purifying industrial waste gas by decomposing various gaseous pollutant molecules by adopting a plasma technology has the advantages of wide pollutant range, strong concentration and flow fluctuation resistance, high purification efficiency and the like, and is capable of stopping and treating immediately.
In order to treat these toxic and harmful gases with low-temperature plasma, a great deal of basic research has been conducted on the mechanism of action of low-temperature plasma in exhaust gas treatment and the method of generating low-temperature plasma. The transfer of energy in a low temperature plasma is generally: electrons get energy from the electric field, and the energy is converted into internal energy and kinetic energy of molecules through collisions, so that the molecules getting energy are excited, and at the same time, part of the molecules are ionized, and the activated particles collide with each other to cause a series of complex physicochemical reactions. The plasma technology provides conditions for treating VOCs and malodorous substances through chemical reaction due to a large amount of active particles such as ions, electrons, excited atoms, molecules, free radicals and the like which are rich in the plasma. However, in the process of degrading VOCs and malodorous substances, the active particles are often not combined with new active particles which are excited by newly generated high-energy electrons when the VOCs and malodorous substances react, so that the utilization rate of the active particles is not high.
In addition, O can be generated when the discharge medium of the low-temperature plasma is air or oxygen 3 Ozone has a longer life than other active particles and, if underutilized, has a portion of O 3 The molecules are compounded by the newly generated active particles, so that the utilization rate of the active particles is not high, and secondary pollutants such as nitrogen oxides and the like can be generated.
Therefore, the recombination probability of active particles in the low-temperature plasma generator is reduced, which means that the efficiency of the active particles for degrading VOCs and malodorous substances is improved, and the generation probability of secondary pollutants is reduced.
Aiming at the problems, although the patent CN204429064U, CN204380489U, CN201830541U, CN103418217B, CN204485611U, CN203002160U refers to multistage series discharge, the technical proposal of the patents only simply increases the stage number and the total input power of the plasma generator, and the invention has the advantages that the plasma generators are arranged at intervals on the premise of the same power input, the recombination probability of active components is effectively reduced, and the treatment effect on waste water or waste gas is improved, which is essentially different in mechanism and effect; in addition, these patents have attempted to increase the processing effect by extending the discharge time for each stage, which is essentially different from the present patent, which shortens the discharge time for each stage.
In addition, O in active substances generated by low-temperature plasmas 3 The service life of the molecule is longer, if the molecule is not fully utilized and enters a new plasma generation area, the molecule is compounded by newly generated active particles, so that the utilization rate of the active particles is not high, and secondary pollution is generatedSuch as nitrogen oxides, etc.
Disclosure of Invention
In view of the above problems, the present invention can improve O in a low-temperature plasma generator by placing an ozonolysis agent in a non-discharge region in the middle of a spaced-apart low-temperature plasma discharge region along the flow direction of a medium 3 The reaction probability of the active particles and pollutants is further improved, so that the degradation efficiency of the pollutants is further improved, and the generation probability of secondary pollutants is reduced.
The invention provides a gap-type low-temperature plasma generator filled with an ozone decomposer, which comprises a low-temperature plasma power supply, a low-temperature plasma discharge unit and a low-temperature plasma reactor, wherein two or more low-temperature plasma discharge units are inserted into the low-temperature plasma reactor, are distributed at intervals in the flowing direction of a medium, are divided into a discharge area and a non-discharge area, and are used for placing the ozone decomposer in the non-discharge area.
Preferably, the time for the medium to pass through the non-discharge region between the discharge cells arranged at intervals is 0.1s to 50s.
Preferably, the ozonolysis agent is a carbon-based or molecular sieve-based decomposition agent loaded with a single or double metal oxide of Co, mn, ni.
Preferably, the low-temperature plasma power supply is any one of a high-voltage power supply, a direct-current power supply and a pulse power supply.
Preferably, the discharge pattern of the low-temperature plasma discharge unit is any one of corona discharge, single dielectric barrier discharge, double dielectric barrier discharge, glow discharge and radio frequency discharge.
Preferably, the low temperature plasma generator is any one of grid type, wire cylinder type or plate wire type.
The invention has the beneficial effects that:
(1) According to the invention, a plurality of groups of discharge units are arranged along the flowing direction of the waste water and the waste gas, and the waste water or the waste gas is discharged at intervals, so that the recombination probability of active particles in the low-temperature plasma generator can be reduced, and the degradation efficiency of the active particles on pollutants is improved;
(2) Along the medium flowOzone decomposer is placed in the non-discharge area in the direction to improve O in the low-temperature plasma generator 3 The reaction probability of the active particles and pollutants further improves the degradation efficiency of the pollutants and reduces the generation probability of secondary pollutants.
The effect of inhibiting the recombination of the low-temperature plasma active components is analyzed by changing the total hydrocarbon degradation effect of the organic waste gas:
(1) The discharge units are arranged along the flowing direction of the wastewater and the exhaust gas, so that the disturbance of the gas flow can be effectively enhanced, and the mixing of media is promoted, thereby increasing the collision and reaction probability of active free radicals and pollutant molecules and improving the utilization efficiency of the active free radicals. The data of the pilot, pilot and industry experiments show that a single discharge cell is turned on, and an unopened discharge cell is placed after that, compared with the prior art without the discharge unit, the degradation efficiency of the total hydrocarbon of the organic waste gas is improved by 3 percent through the two-stage dielectric barrier discharge equipment;
(2) The generation of active radicals in dielectric barrier discharge depends on the energy injection in the discharge process, and generally, as the injection energy increases, the yield of active radicals increases, but the increase gradually slows down, and the injection energy of a single discharge unit and the generation density of active radicals have upper limits. Therefore, under certain power consumption, a plurality of groups of discharge units are adopted to reasonably distribute energy injection, and the method has an important influence on the yield of active free radicals. The pilot test and pilot test experiment researches show that the total hydrocarbon degradation efficiency of the discharge equipment which is subjected to two-stage dielectric barrier is obviously higher than that of the discharge equipment which is only provided with a single discharge unit by adopting the single discharge unit and arranging an unopened discharge unit after the single discharge unit;
(3) Experiments show that the power of each discharge unit is 180W, the contact time of the organic waste gas and the low-temperature plasma generator is 0.1s, the distance between the two low-temperature plasma generators is increased from 0.3m to 1.0m, and the total hydrocarbon degradation efficiency is 81%. Under the condition of certain total power consumption, compared with a single discharge unit, the total hydrocarbon degradation efficiency of starting two groups of discharge units is improved by 19% by increasing the discharge interval.The reason is that O and O generated during the discharge process 3 The isoactive free radical has higher density and longer service life (> 1 s), is difficult to completely consume when generated by the first discharge unit and reaches the second discharge unit along with the flowing of the gas, and has a large amount of O and O around the second discharge unit 3 The presence of isoactive radicals which inhibit the second discharge cells O and O 3 Thus, when two discharge cells are arranged closely, the total O and O are generated 3 The quantity is lower than the sum generated when the two discharge units are arranged independently, and the invention adopts a design with adjustable spacing, so that the problem is effectively avoided.
Drawings
FIG. 1 is a schematic illustration of the location of an ozone-decomposing agent in a compartmentalized low temperature plasma generator according to the present invention;
fig. 2 is a schematic view of a spaced-apart low temperature plasma generator according to the present invention.
Description of the reference numerals:
1-a low temperature plasma reactor; 2-a low temperature plasma generator; 3-a low temperature plasma power supply;
4-junction box; 5-window; 6-a sewage outlet; 7-purge port.
Detailed Description
Example 1
The parameters set for the low temperature plasma generator filled with ozone decomposer layer were as follows: the 2 double-dielectric barrier discharge low-temperature plasma generators are distributed at intervals of 0.6m in the flowing direction of the medium, an ozonolysis agent layer (carbon-based decomposition agent loaded with Co) with the thickness of 5cm is filled between the two low-temperature plasma generators, the total input power is 360W, the flowing speed of the medium is 1m/s, the contact time of the medium and each plasma generator is 0.05s, and the residence time of the medium in a non-discharge area is 0.1s.
Taking organic volatile gas generated by a sewage treatment device of a certain oil refinery to test, wherein the benzene content in the waste gas is 120mg/Nm before the test 3 After the degradation by the above-mentioned interval type low-temperature plasma generator, the benzene content was 46mg/Nm 3 The benzene removal rate reaches 61%.
Comparative example 1
The setting parameters of the interval type temperature plasma generator are as follows: the 2 double-dielectric barrier discharge low-temperature plasma generators are distributed at intervals of 0.6m in the flowing direction of the medium, an ozonolysis agent layer is not arranged, the total input power is 360W, the flowing speed of the medium is 1m/s, the contact time of the medium and each plasma generator is 0.05s, and the residence time of the medium in a non-discharge area is 0.1s.
The same organic volatile gas as in example 1 was used for the test, and the benzene removal rate was 42%.
Example 2
The parameters set for the low temperature plasma generator filled with ozone decomposer layer were as follows: 2 single-dielectric-barrier, wire-cylinder type low-temperature plasma generators are arranged at intervals of 1.0m in the medium flow direction, an ozonolysis agent layer (Mn-loaded molecular sieve-based decomposer) with a thickness of 5cm is filled behind each low-temperature plasma generator, the distance from the front low-temperature plasma generator is 0.6m, the total input power is 360W, the medium flow speed is 0.5m/s, the contact time of the medium and each plasma generator is 0.3s, and the residence time of the medium in a non-discharge area is 3s.
Taking organic volatile waste gas generated by a sewage treatment device of a certain oil refinery to test, wherein the benzene content in the waste gas is 80mg/Nm before the test 3 After the degradation by the above-mentioned interval type low-temperature plasma generator, the benzene content was 14mg/Nm 3 The benzene removal rate reaches 83%.
Comparative example 2
The setting parameters of the interval type low temperature plasma generator are as follows: 2 single-medium-blocking and linear-cylinder low-temperature plasma generators are continuously distributed for 1.0m in the flowing direction of a medium, an ozonolysis agent layer is not arranged, the total input power is 360W, the flowing speed of the medium is 0.5m/s, the contact time of the medium and each plasma generator is 0.3s, and the residence time of the medium in a non-discharge area is 3s.
The same organic waste gas as in example 2 was used for the test, and the benzene removal rate was 57%.
Example 3
The parameters set for the low temperature plasma generator filled with ozone decomposer layer were as follows: 3 double-medium-blocking grid-type low-temperature plasma generators are distributed at intervals of 1.0m in the medium flow direction, an ozonolysis agent layer (molecular sieve based decomposing agent loaded with Ni) with the thickness of 5cm is filled between the two low-temperature plasma generators in the medium flow direction, the distance from the front low-temperature plasma generator is 0.8m, the total input power is 360W, the medium flow speed is 1m/s, the contact time of the medium and each plasma generator is 0.1s, and the residence time of the medium in a non-discharge area is 5s.
Taking organic waste gas volatile gas generated by a sewage treatment device of a certain oil refinery to test, wherein the total hydrocarbon content in the waste gas is 760mg/Nm before the test 3 After degradation by the above-mentioned intermittent low-temperature plasma generator, the total hydrocarbon content was 80mg/Nm 3 The total hydrocarbon removal rate reaches 89%.
Comparative example 3
The setting parameters of the interval type low temperature plasma generator are as follows: the outer electrodes of the 3 double-dielectric-barrier grid-type low-temperature plasma generators are distributed at intervals of 1.0m in the flowing direction of the medium, an ozone decomposer layer is not arranged, the total input power is 360W, the flowing speed of the medium is 1m/s, the contact time of the medium and each plasma generator is 0.1s, and the residence time of the medium in a non-discharge area is 5s.
The same organic waste gas as in example 3 was used for the test, and the total hydrocarbon removal rate was 70%.
Example 4
The parameters set for the low temperature plasma generator filled with ozone decomposer layer were as follows: 4 corona discharge arrays and plate-line type low-temperature plasma generators are distributed at intervals of 0.3m, an ozone catalyst layer (molecular sieve based decomposer loaded with Mn and Ni bimetallic oxide) with the thickness of 5cm is filled between the two low-temperature plasma generators in the flowing direction of the medium, the distance from the front low-temperature plasma generators is 0.8m, the total input power is 360W, the contact time of the medium and each plasma generator is 30s, and the residence time of the medium in a non-discharge area is 50s.
Taking effluent of a sewage treatment device of a certain oil refinery for test, wherein before the test, the content of COD in the wastewater is 90mg/L, and after the degradation of the intermittent low-temperature plasma generator, the content of COD is 4.5mg/L, and the removal rate is 95%.
Comparative example 4
The setting parameters of the interval type low temperature plasma generator are as follows: 4 corona discharge arrays and plate-line type low-temperature plasma generators are distributed at intervals of 0.3m, an ozone catalyst is not arranged, the total input power is 360W, the contact time of wastewater and each plasma generator is 30s, and the residence time of wastewater in a non-discharge area is 50s.
The same wastewater as in example 4 was used for the test, and the COD removal rate was 60%.
As can be seen from the above examples 1 to 4 and comparative examples 1 to 4, arranging a plurality of sets of discharge cells along the flow direction of the wastewater or exhaust gas can significantly improve the removal rate of pollutants by discharging the wastewater or exhaust gas at intervals while placing an ozonolysis agent in the non-discharge region along the flow direction of the medium.
Claims (4)
1. An interval type low-temperature plasma generator filled with ozone decomposer comprises a low-temperature plasma power supply, a low-temperature plasma discharge unit and a low-temperature plasma reactor, and is characterized in that two or more low-temperature plasma discharge units are inserted into the low-temperature plasma reactor, are distributed at intervals in the flowing direction of a medium, the low-temperature plasma reactor is divided into a discharge area and a non-discharge area, and the ozone decomposer is placed in the non-discharge area;
the time of the medium passing through the non-discharge area between the plasma discharge units distributed at intervals is 0.1s-50s;
the ozonolysis agent is a carbon-based or molecular sieve-based decomposition agent loaded with Co, mn and Ni single metal or bimetallic oxide.
2. The ozone decomposer-filled, compartmentalized, low temperature plasma generator of claim 1 wherein the low temperature plasma source is any one of a high voltage source, a dc source, and a pulsed source.
3. The ozone decomposer-filled space type low temperature plasma generator of claim 1, wherein the discharge pattern of the low temperature plasma discharge unit is any one of corona discharge, single dielectric barrier discharge, double dielectric barrier discharge, glow discharge and radio frequency discharge.
4. The ozone decomposer-filled, compartmentalized, low temperature plasma generator of claim 1, wherein the low temperature plasma generator is any one of grid format, wire cylinder, or plate and wire.
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| CN2017206346623 | 2017-06-02 | ||
| CN201720634662 | 2017-06-02 |
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| CN108970363B true CN108970363B (en) | 2023-11-03 |
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| CN201721001058.3U Active CN207576103U (en) | 2017-06-02 | 2017-08-11 | A kind of compartment low-temperature plasma generator for filling ozone-decomposing agent |
| CN201710684060.3A Active CN108970363B (en) | 2017-06-02 | 2017-08-11 | Interval type low-temperature plasma generator filled with ozone decomposer |
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| CN117531365A (en) * | 2023-12-04 | 2024-02-09 | 山西博允环保新科技有限公司 | Purification method for long-acting decomposition of harmful gas and application thereof |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN204429064U (en) * | 2014-11-28 | 2015-07-01 | 上海译琅环保科技有限公司 | A kind of device of plasma for purification industrial waste gas |
| CN105066271A (en) * | 2015-08-12 | 2015-11-18 | 无锡伦宝环保科技有限公司 | Multi-ion-field indoor air purifier |
| CN105833677A (en) * | 2016-04-19 | 2016-08-10 | 中国石油化工股份有限公司 | Method and equipment for treating volatile organic compounds by low-temperature plasma coupling adsorption |
| CN207576103U (en) * | 2017-06-02 | 2018-07-06 | 中国石油化工股份有限公司 | A kind of compartment low-temperature plasma generator for filling ozone-decomposing agent |
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| EP2012904A2 (en) * | 2006-02-17 | 2009-01-14 | Plasma Clean Limited | Gas treatment using a plurality of plasma generating reactor units |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN204429064U (en) * | 2014-11-28 | 2015-07-01 | 上海译琅环保科技有限公司 | A kind of device of plasma for purification industrial waste gas |
| CN105066271A (en) * | 2015-08-12 | 2015-11-18 | 无锡伦宝环保科技有限公司 | Multi-ion-field indoor air purifier |
| CN105833677A (en) * | 2016-04-19 | 2016-08-10 | 中国石油化工股份有限公司 | Method and equipment for treating volatile organic compounds by low-temperature plasma coupling adsorption |
| CN207576103U (en) * | 2017-06-02 | 2018-07-06 | 中国石油化工股份有限公司 | A kind of compartment low-temperature plasma generator for filling ozone-decomposing agent |
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