CN106268208B - The experimental system of Low Temperature Plasma Treating organic polluted soil thermal desorption tail gas - Google Patents
The experimental system of Low Temperature Plasma Treating organic polluted soil thermal desorption tail gas Download PDFInfo
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- CN106268208B CN106268208B CN201610652678.7A CN201610652678A CN106268208B CN 106268208 B CN106268208 B CN 106268208B CN 201610652678 A CN201610652678 A CN 201610652678A CN 106268208 B CN106268208 B CN 106268208B
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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
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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
- B01D53/02—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
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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
- B01D53/14—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 absorption
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09C—RECLAMATION OF CONTAMINATED SOIL
- B09C1/00—Reclamation of contaminated soil
- B09C1/06—Reclamation of contaminated soil thermally
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2253/00—Adsorbents used in seperation treatment of gases and vapours
- B01D2253/10—Inorganic adsorbents
- B01D2253/102—Carbon
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- Life Sciences & Earth Sciences (AREA)
- Soil Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- Plasma Technology (AREA)
- Treating Waste Gases (AREA)
Abstract
The present invention provides a kind of experimental system of Low Temperature Plasma Treating organic polluted soil thermal desorption tail gas, including carrier gas device, thermal desorption tail gas generating device, attemperator, apparatus for low-temperature plasma treatment and device for absorbing tail gas;The carrier gas device includes the first carrier gas access for providing common gases and for providing the second carrier gas access of mixed gas, wherein the mixed gas refers to the mixture of common gases and vapor;The thermal desorption tail gas generating device is for generating polluted gas;The attemperator is used to prevent condensation of the pollutant in pipeline in thermal desorption tail gas;The apparatus for low-temperature plasma treatment is for the pollutant in degradation treatment thermal desorption tail gas;The device for absorbing tail gas is for absorbing pollutant remaining in thermal desorption tail gas after degradation treatment.Experimental system structure of the invention is simple, and installation and debugging are convenient and efficient, and the technological parameter acquisition period is short, and energy consumption cost is low.
Description
Technical field
The invention belongs to field of environment engineering technology, and in particular to a kind of Low Temperature Plasma Treating organic polluted soil heat
The experimental system of desorption tail gas.
Background technique
With the adjustment of Industry Structure and the quickening of urbanization process, a large amount of chemical industry, pesticide producing enterprise is caused to be removed
It moves, inhabitation or commercial land etc. is much adjusted in original soil, these enterprises are in the daily production and operation, at waste
The reasons such as reason, chemical leakage and discharge of wastewater, have had resulted in serious soil pollution, especially organic pollution.It is related to
Pollutant include petroleum hydrocarbon, polycyclic aromatic hydrocarbon, benzene homologues, organo-chlorine pesticide, Polychlorinated biphenyls etc..Thermal desorption technology is by direct
Or indirect heat exchange, the soil containing pollutant is heated to sufficiently high temperature, thus make pollutant volatilize from soil or
Isolated process.Since treatment effeciency is high, repairing efficiency is short and the significant advantages such as soil is recycling after repairing, thermal desorption technology
It has been widely used in the repairing and treating of organic polluted soil.It is practical but since thermal desorption technology is a physically separate technology
On be process that pollutant is transferred to tail gas from soil, therefore in thermal desorption tail gas in the urgent need to address organic pollutant control
Problem.
Improvement for organic polluted soil thermal desorption tail gas, currently used method have condensation-absorption method and burning-suction
Attached method etc..Although condensation-absorption method can effectively remove the organic pollutant in tail gas, this method still needs to condensation-
Pollutant after absorption is disposed, and adsorbent consumption is big, at high cost.And combustion method is high to the removal efficiency of pollutant,
But need to consume a large amount of fuel, treated, and tail gas is also easy to produce dioxin in cooling discharge process, it is therefore desirable to after combustion
Increase quenching apparatus, processing cost is higher.
Therefore, this field needs the research and development system and method that cost is lower, effect preferably handles thermal desorption tail gas,
To solve the control problem of organic pollutant.
Summary of the invention
In view of this, the object of the present invention is to provide a kind of Low Temperature Plasma Treating organic polluted soil thermal desorption tail gas
Experimental system, at least solve one of the above-mentioned problems of the prior art.
To achieve the above object, the present invention provides a kind of Low Temperature Plasma Treating organic polluted soil thermal desorption tail gas
Experimental system, including carrier gas device, thermal desorption tail gas generating device, attemperator, apparatus for low-temperature plasma treatment and tail gas
Absorption plant;
The carrier gas device includes the first carrier gas access for providing common gases and for providing mixed gas
Two carrier gas accesses, wherein the mixed gas refers to the mixture of common gases and vapor;
The thermal desorption tail gas generating device is for generating polluted gas;
The attemperator is used to prevent condensation of the pollutant in pipeline in thermal desorption tail gas;
The apparatus for low-temperature plasma treatment is for the pollutant in degradation treatment thermal desorption tail gas;
The device for absorbing tail gas is for absorbing pollutant remaining in thermal desorption tail gas after degradation treatment.
The present invention also provides utilize Low Temperature Plasma Treating organic polluted soil thermal desorption tail gas as described above simultaneously
Experimental system method that organic polluted soil thermal desorption tail gas is handled, include the following steps:
The common gases that (1) first carrier gas access provides enter in thermal desorption tail gas generating device, by way of bubbling
Polluted gas is generated, after the mixture of common gases and vapor that the polluted gas and the second carrier gas access provide mixes,
Form thermal desorption tail gas;
(2) the thermal desorption tail gas is passed through the apparatus for low-temperature plasma treatment, presses pollutant therein in height
It is degraded under electricity;
(3) through apparatus for low-temperature plasma treatment, treated that tail gas is passed through the device for absorbing tail gas, makes wherein to remain
Pollutant and organic degradation product be absorbed the absorption of the organic solvent in bottle, inorganic catabolite inhaled by corresponding inorganic solvent
It receives.
Compared with prior art the present invention have following innovative point and the utility model has the advantages that the present invention relates to it is a kind of it is small-sized,
Can rapid evaluation Low Temperature Plasma Treating thermal desorption tail gas effect experimental system and one kind can quickly, systematically survey
The method for trying Low Temperature Plasma Treating effect.Tail gas generating device and processing unit are placed in by experimental system as a whole
In attemperator, temperature control is accurate, effectively prevents condensation of the half volatile pollutant in pipeline, reduces experiment and misses
Difference, to keep experimental data more accurate.Experimental system structure is simple, and installation and debugging are convenient and efficient, and technological parameter obtains the period
Short, energy consumption cost is low.
Experimental method in the present invention is to determine experiment condition according to the main feature of practical thermal desorption tail gas, is then existed
The degradation efficiency of pollutant in thermal desorption tail gas is tested under the experiment condition.Pollutant concentration, water vapor concentration, stop can be obtained
Influence of the key process parameters such as time, treatment temperature and electric parameter to contaminant degradation in thermal desorption tail gas is low temperature etc.
The practical application that gas ions handle thermal desorption tail gas provides scientific guidance and technical support, provides foundation for Practical Project, promotes
The development of soil thermal desorption recovery technique.
Detailed description of the invention
Fig. 1 is the structural diagram of the present invention.
[description of symbols]
1- gas bomb
2- mass flowmenter
3-high-temperature resistant polytetrafluoroethylmelt air inlet pipe
4-air dry ovens
5- is equipped with the vial of pollutant
6- oil bath pan
7- surge flask
8- steam generator
9- surge flask
10-high voltage power supplies
11-reaction of low temperature plasma devices
12-high-tension cables
13-absorption bottles
14-cycle condensers
15-corrosion-resistant soft air-guide pipes
16-active carbon adsorbers.
Specific embodiment
To make the objectives, technical solutions, and advantages of the present invention clearer, below in conjunction with specific embodiment, and reference
Attached drawing, the present invention is described in further detail.
The experimental system of Low Temperature Plasma Treating organic polluted soil thermal desorption tail gas provided by the invention, including carrier gas
Device, thermal desorption tail gas generating device, attemperator, apparatus for low-temperature plasma treatment and device for absorbing tail gas;
The carrier gas device includes the first carrier gas access for providing common gases and for providing mixed gas
Two carrier gas accesses, wherein the mixed gas refers to the mixture of common gases and vapor;
The thermal desorption tail gas generating device is for generating polluted gas;
The attemperator is used to prevent condensation of the pollutant in pipeline in thermal desorption tail gas;
The apparatus for low-temperature plasma treatment is for the pollutant in degradation treatment thermal desorption tail gas;
The device for absorbing tail gas is for absorbing pollutant remaining in thermal desorption tail gas after degradation treatment.
Preferably, the first carrier gas access includes first gas steel cylinder and the first mass flowmenter, the first gas
Steel cylinder connects the thermal desorption tail gas generating device, and first mass flowmenter is located at the connection first gas steel cylinder and institute
On the high-temperature resistant tube for stating thermal desorption tail gas generating device;
Preferably, the second carrier gas access includes that second gas steel cylinder, the second mass flowmenter and vapor fill
It sets, the second gas steel cylinder connects the water vapor generation device, and second mass flowmenter is located at connection described second
On the high-temperature resistant tube of gas bomb and the water vapor generation device.
It is highly preferred that the high-temperature resistant tube is high-temperature resistant polytetrafluoroethylmelt pipe.
Preferably, heretofore described common gases refer to air, oxygen, nitrogen or argon gas.
Preferably, the thermal desorption tail gas generating device includes pollution source device and heating device, the pollution source device
Middle splendid attire pollutant, the pollution source device are placed in the heating device.
Preferably, the device for absorbing tail gas includes absorption bottle and active carbon adsorber.
It is highly preferred that the quantity of the absorption bottle is two or more, connection type is series connection, nothing is contained in the absorption bottle
Solvent and organic solvent, with the corresponding inorganic catabolite absorbed in tail gas and remaining pollutant and organic degradation product.
It is highly preferred that the device for absorbing tail gas further includes cycle condenser, the absorption bottle is placed in the circulating condensing
In device.
Preferably, the thermal desorption tail gas generating device and apparatus for low-temperature plasma treatment are placed in institute as a whole
It states in attemperator.
The preferred air dry oven of attemperator.
Preferably, the apparatus for low-temperature plasma treatment includes high voltage power supply, high-tension cable and reactor, the high pressure
Power supply is realized by high-tension cable realizes electrion in inside reactor, with the pollutant in degradation treatment thermal desorption tail gas.
The present invention utilizes the experimental system of Low Temperature Plasma Treating organic polluted soil thermal desorption tail gas as described above
To the method that organic polluted soil thermal desorption tail gas is handled, include the following steps:
The common gases that (1) first carrier gas access provides enter in thermal desorption tail gas generating device, by way of bubbling
Polluted gas is generated, after the mixture of common gases and vapor that the polluted gas and the second carrier gas access provide mixes,
Form thermal desorption tail gas;
(2) the thermal desorption tail gas is passed through the apparatus for low-temperature plasma treatment, presses pollutant therein in height
It is degraded under electricity;
(3) through apparatus for low-temperature plasma treatment, treated that tail gas is passed through the device for absorbing tail gas, makes wherein to remain
Pollutant and organic degradation product be absorbed the absorption of the organic solvent in bottle, inorganic catabolite inhaled by corresponding inorganic solvent
It receives.
It is carried wherein it is preferred to which in step (1) first can be adjusted by the first mass flowmenter and the second mass flowmenter
The flow velocity of gas in gas access and the second carrier gas access can control gas in the residence time of low temperature plasma;
It preferably, can also be in the common gases and water that the polluted gas and the second carrier gas access provide in step (1)
Before the mixture mixing of steam, after being buffered each by surge flask respectively, remix to form thermal desorption tail gas;
Preferably, thermal desorption tail gas generating device described in step (1) can pass through the heating temperature of adjusting heating device
With the flow velocity for adjusting gas in the first carrier gas access and the second carrier gas access, to control the concentration of pollutant;
Preferably, the content of water vapour can be controlled by adjusting the power of steam generator in step (1);
Preferably, the anti-of plasma processing apparatus can be controlled by adjusting the temperature of attemperator in step (2)
Answer the temperature of device.
Embodiment 1
As shown in Figure 1, the experimental system of Low Temperature Plasma Treating organic polluted soil thermal desorption tail gas of the invention, packet
Include carrier gas device, attemperator, thermal desorption tail gas generating device, apparatus for low-temperature plasma treatment and device for absorbing tail gas.
The carrier gas device includes gas bomb 1, mass flowmenter 2 and high-temperature resistant polytetrafluoroethylmelt air inlet pipe 3, wherein resistance to
High temperature polytetrafluoroethylene (PTFE) air inlet pipe 3 is connected on the gas outlet of gas bomb, and mass flowmenter 2 is located at high-temperature resistant polytetrafluoroethylmelt
In air inlet pipe 3.
The attemperator is air dry oven 4, and chamber door body is equipped with observation window, working condition in energy clear view case.Drum
4 left and right sides wall of wind drying box is equipped with aperture, and high-temperature resistant polytetrafluoroethylmelt air inlet pipe 3 is passed through air dry oven 4 by tapping, opens
Thermal insulation material encapsulation process is used at hole accurately to control the temperature in air dry oven 4.For the safety of Protection personnel,
Air dry oven 4 does protective grounding processing.
The thermal desorption tail gas generating device is placed in air dry oven, and the pollutant in vial 5 is in oil bath pan 6
Interior high-temperature heating is in a liquid state, and gas is passed through in vial 5, and the gas with pollutant is generated by way of bubbling, then into
Enter surge flask 7;Another way carrier gas is connected with steam generator 8 first, generates the carrier gas for containing certain humidity, then passes to slow
Bottle 9 is rushed, the carrier gas come out by surge flask 9 is in surge flask 7 and gas mixing of the another way containing pollutant is uniform, as thermal desorption
Tail gas.
The apparatus for low-temperature plasma treatment includes high voltage power supply 10, high-tension cable 12 and reactor 11, high voltage power supply
10 are placed in outside air dry oven 4, and reactor 11 is placed in inside air dry oven 4, and reactor 11 and high-tension cable 12 are all made of
Material resistant to high temperature, high-tension cable 12 are connected by the aperture of air dry oven 4 with reactor 11, the high pressure of aperture junction
Cable 12 is wrapped up using the polyfluortetraethylene pipe of insulation high-temperature-resistant.
The device for absorbing tail gas includes that absorption bottle 13, cycle condenser 14, corrosion-resistant soft air-guide pipe 15 and active carbon are inhaled
Adnexa 16, is placed in outside air dry oven, and the aperture that reactor tip tube routes air dry oven is stretched out, and is led by corrosion-resistant
Gas hose 15 is connected with device for absorbing tail gas, and hose outlet side is connected with absorption bottle 13, absorption bottle 13 at least there are two and go here and there
It is linked togather, absorption bottle 13 is placed in cycle condenser 14, and the gas outlet of absorption bottle 13 is further through active carbon adsorber 16 and greatly
Gas connection.
Embodiment 2
It is tested using the system of embodiment 1, specific as follows:
Two-way gas is air, wherein the gas flow rate for being passed through pollutant generator is 0.5mL/min, in addition all the way
The flow velocity for compensating gas is 3mL/min.Select DDT as representative pollutant, oil bath heating temperature is 150 DEG C, forced air drying
Box temperature degree is 120 DEG C, and tow channel gas is entered after mixing in surge flask in reaction of low temperature plasma device, low-temperature plasma used
Body is corona discharge pulse low temperature plasma, reactor diameter 15cm, effective length 0.9m.The electricity of pulsed discharge is set
Pressure is respectively 15KV, 20KV, 25KV and 30KV, and it is de- to investigate DDT heat under different discharge voltages by fixed pulse frequency 50HZ
The removal situation of attached tail gas, the degradation efficiency of DDT increases with the increase of discharge voltage as the result is shown, and discharge voltage is
When 30KV, the degradation efficiency of DDT is 78%.
Above embodiments explanation, experimental system of the invention can quickly, systematically test Low Temperature Plasma Treating effect
The method of fruit.Tail gas generating device and processing unit are placed in hot environment by experimental system as a whole, temperature control
Accurately, condensation of the half volatile pollutant in pipeline is effectively prevented, experimental error is reduced, to make experimental data more
Accurately.Experimental system structure is simple, and installation and debugging are convenient and efficient, and the technological parameter acquisition period is short, and energy consumption cost is low.
Experimental method in the present invention is to determine experiment condition according to the main feature of practical thermal desorption tail gas, is then existed
The degradation efficiency of pollutant in thermal desorption tail gas is tested under the experiment condition.Pollutant concentration, water vapor concentration, stop can be obtained
Influence of the key process parameters such as time, treatment temperature and electric parameter to contaminant degradation in thermal desorption tail gas is low temperature etc.
The practical application that gas ions handle thermal desorption tail gas provides scientific guidance and technical support, provides foundation for Practical Project, promotes
The development of soil thermal desorption recovery technique.
Particular embodiments described above has carried out further in detail the purpose of the present invention, technical scheme and beneficial effects
Describe in detail bright, it should be understood that the above is only a specific embodiment of the present invention, is not intended to restrict the invention, it is all
Within the spirit and principles in the present invention, any modification, equivalent substitution, improvement and etc. done should be included in protection of the invention
Within the scope of.
Claims (9)
1. a kind of experimental system of Low Temperature Plasma Treating organic polluted soil thermal desorption tail gas, which is characterized in that including carrying
Device of air, thermal desorption tail gas generating device, attemperator, apparatus for low-temperature plasma treatment and device for absorbing tail gas;
The carrier gas device includes that the first carrier gas access for providing common gases and second for providing mixed gas carry
Gas access, wherein the mixed gas refers to the mixture of common gases and vapor;
The thermal desorption tail gas generating device is for generating polluted gas, wherein the common gases that the first carrier gas access provides into
Enter in thermal desorption tail gas generating device, polluted gas, the polluted gas and the second carrier gas access are generated by way of bubbling
After the common gases of offer and the mixture mixing of vapor, thermal desorption tail gas is formed;
The attemperator is used to prevent condensation of the pollutant in pipeline in thermal desorption tail gas, wherein the thermal desorption tail
Gas generating device and apparatus for low-temperature plasma treatment are located in the attemperator;
The apparatus for low-temperature plasma treatment is for the pollutant in degradation treatment thermal desorption tail gas;
The device for absorbing tail gas is for absorbing pollutant remaining in thermal desorption tail gas after degradation treatment.
2. experimental system according to claim 1, which is characterized in that the first carrier gas access includes first gas steel cylinder
With the first mass flowmenter, the first gas steel cylinder connects the thermal desorption tail gas generating device, first mass flow
Meter is located on the high-temperature resistant tube for connecting the first gas steel cylinder and the thermal desorption tail gas generating device;
The second carrier gas access includes second gas steel cylinder, the second mass flowmenter and water vapor generation device, and described second
Gas bomb connects the water vapor generation device, and second mass flowmenter is located at the connection second gas steel cylinder and institute
It states on the high-temperature resistant tube of water vapor generation device.
3. experimental system according to claim 1, which is characterized in that the common gases refer to air, oxygen, nitrogen or
Argon gas.
4. experimental system according to claim 1, which is characterized in that the thermal desorption tail gas generating device includes pollution sources
Device and heating device contain pollutant in the pollution source device, and the pollution source device is placed in the heating device;
The device for absorbing tail gas includes absorption bottle and active carbon adsorber.
5. experimental system according to claim 4, which is characterized in that the quantity of the absorption bottle is more than two, connection
Mode is series connection;Inorganic solvent and organic solvent are contained in the absorption bottle, with the corresponding inorganic catabolite absorbed in tail gas
With remaining pollutant and organic degradation product.
6. experimental system according to claim 4, which is characterized in that the device for absorbing tail gas further includes circulating condensing
Device, the absorption bottle are placed in the cycle condenser.
7. experimental system according to claim 1, which is characterized in that the attemperator is air dry oven.
8. utilizing the reality of the described in any item Low Temperature Plasma Treating organic polluted soil thermal desorption tail gas of claim 1~7
The method that check system handles organic polluted soil thermal desorption tail gas, which comprises the steps of:
The common gases that (1) first carrier gas access provides enter in thermal desorption tail gas generating device, are generated by way of bubbling
Polluted gas after the mixture of common gases and vapor that the polluted gas and the second carrier gas access provide mixes, is formed
Thermal desorption tail gas;
(2) the thermal desorption tail gas is passed through the apparatus for low-temperature plasma treatment, makes pollutant therein under electrion
It is degraded;
(3) through apparatus for low-temperature plasma treatment, treated that tail gas is passed through the device for absorbing tail gas, makes wherein remaining dirt
Dye object and organic degradation product are absorbed the absorption of the organic solvent in bottle, and inorganic catabolite is absorbed by corresponding inorganic solvent.
9. according to the method described in claim 8, it is characterized by:
The first carrier gas access and the second carrier gas access are adjusted by the first mass flowmenter and the second mass flowmenter in step (1)
The flow velocity of middle gas, residence time of the control gas in low temperature plasma;
The mixture of the common gases and vapor that provide in the polluted gas with the second carrier gas access in step (1) mixes it
Before, after being buffered each by surge flask respectively, remix to form thermal desorption tail gas;
Thermal desorption tail gas generating device described in step (1) is led to by adjusting the heating temperature of heating device and adjusting the first carrier gas
The flow velocity of gas in road and the second carrier gas access, to control the concentration of pollutant;
The content of water vapour is controlled by adjusting the power of steam generator in step (1);
The temperature of the reactor of plasma processing apparatus is controlled by adjusting the temperature of attemperator in step (2).
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