CN111482064A - A kind of plasma purification device and purification method of waste gas in heat treatment workshop - Google Patents

Abstract

The invention provides a waste gas plasma purification device and a purification method in a heat treatment workshop, belonging to the technical field of waste gas treatment. It solves the problems that the existing heat treatment workshop waste gas treatment has low effect, poor waste gas selectivity and process conditions that do not meet the characteristics of the industry. It includes a mechanical dust removal module, an exhaust gas washing module, a plasma primary purification module and a plasma secondary purification module, which are arranged in series horizontally. The exhaust gas washing module purifies and separates water-soluble pollutants in the exhaust gas, the plasma primary purification module includes a first gas distribution plate, a dielectric barrier discharge assembly and a photolysis catalytic plate, and the plasma secondary purification module includes a first gas distribution plate, a dielectric barrier discharge assembly and a photolysis catalytic plate. Two gas distribution plates, needle mesh discharge components and activated carbon fiber filter. It is mainly used for purification of waste gas in heat treatment workshop.

Description

A kind of plasma purification device and purification method of waste gas in heat treatment workshop

technical field

The invention belongs to the technical field of waste gas treatment, and in particular relates to a waste gas plasma purification device and a purification method in a heat treatment workshop.

Background technique

Basic materials and their properties have always restricted China's economic and social development. Heat treatment of metal materials is an important part of it, and the waste gas generated during heat treatment processing is also increasingly polluting the environment. Due to the different equipment and processes in heat treatment, the waste gas pollutants are also different, including various types of soot, dust, oil fume, hydrocarbons and other harmful gases. As the fourth state of matter, plasma technology has been widely used in material surface treatment, gas purification and other fields. At present, the state advocates green manufacturing, and calls for the transformation and upgrading of the heat treatment industry by shutting down production, pollution control, and technological transformation. Efficient purification of exhaust gas is an urgent need for exhaust gas purification management in heat treatment workshops. At present, methods such as chemical neutralization are mainly used to purify the waste gas of the heat treatment workshop, but there are problems such as poor targeting and secondary pollution. The existing technologies and equipment such as plasma discharge treatment, but the effects are not high, the selectivity of waste gas, and the process conditions. Inconsistent with the characteristics of the industry and other problems, the heat treatment industry application market is in urgent need of a plasma purification device and purification method that can realize the exhaust gas of the heat treatment workshop.

SUMMARY OF THE INVENTION

In order to solve the problems in the prior art, the present invention proposes a plasma purification device and purification method for waste gas in a heat treatment workshop.

In order to achieve the above object, the present invention adopts the following technical solutions: a plasma purification device for waste gas in a heat treatment workshop, which includes a mechanical dust removal module, a waste gas washing module, a plasma primary purification module and a plasma secondary purification module arranged in series in sequence horizontally. , the mechanical dust removal module performs mechanical dust removal and separation on granular soot and dust in the exhaust gas, the exhaust gas washing module purifies and separates water-soluble pollutants in the exhaust gas, and the plasma primary purification module includes a first gas A distribution plate, a dielectric barrier discharge assembly and a photolysis catalytic plate, the first gas distribution plate is located in front of the dielectric barrier discharge assembly, the number of the dielectric barrier discharge assemblies is multiple, and the photolysis catalytic plate is placed between adjacent dielectric barrier discharge assemblies , the dielectric barrier discharge assembly includes a hollow cylindrical test tube structure and a rod-shaped electrode, the hollow cylindrical test tube structure is a dielectric barrier layer, the rod-shaped electrode is fixed in the center of the hollow cylindrical test tube structure to form a single electrode, and the number of the single electrode is Multiple, multiple single electrodes are arranged in an array structure, two single electrodes form a counter electrode, and more than two columns of counter electrodes form a dielectric barrier discharge assembly, the single electrodes are connected to the power supply in parallel, and the plasma two The stage purification module includes a second gas distribution plate, a needle mesh discharge assembly and an activated carbon fiber filter, the second gas distribution plate is located in front of the needle mesh discharge assembly, the activated carbon fiber filter is located behind the needle mesh discharge assembly, and the needle mesh discharge assembly. The mesh discharge assembly adopts a single needle as the electrode of the pulse power supply, and the mesh electrode is grounded to realize corona discharge at the needle tip. The plasma secondary purification module is connected to the exhaust tower to discharge the treated gas.

Further, the purification device further includes a main control module, and the main control module is respectively connected with the mechanical dust removal module, the exhaust gas washing module, the plasma primary purification module and the plasma secondary purification module.

Further, the main control module is respectively connected with the gas detection module and the power system module.

Further, the photolysis catalyst plate is a honeycomb aluminum base, and the surface is coated with a nanometer photolysis catalyst.

Further, the hollow cylindrical test tube structure is made of ceramic or quartz material.

Further, the rod-shaped electrode is made of stainless steel.

Further, the mechanical dust removal module includes a centrifugal separator, an electrostatic adsorption assembly and a mechanical filter element filter screen, the centrifugal separator, the electrostatic adsorption assembly and the mechanical filter element filter screen are connected in sequence, and a dust accumulation is arranged below the mechanical dust removal module. Hopper.

Further, the exhaust gas washing module includes a washing tower and a gas drying part, and the washing tower and the gas drying part are connected.

Further, a traction fan is arranged in the exhaust tower.

The present invention also includes a plasma purification method for waste gas in a heat treatment workshop, which comprises the following steps:

Step 1: The exhaust gas generated by the heat treatment process first enters the mechanical dust removal module. The exhaust gas passes through the centrifugal separator, the electrostatic adsorption component and the mechanical filter element filter screen in turn to remove the granular soot and dust, and the separated soot and dust fall into the dust hopper. subsequent cleaning;

Step 2: The exhaust gas after mechanical dust removal enters the exhaust gas washing module, and the water-soluble pollutants in the exhaust gas are purified and separated by the washing tower, and then the gas is dried by the gas drying part;

Step 3: The exhaust gas after the exhaust gas washing enters the plasma primary purification module and the plasma secondary purification module in turn, and undergoes plasma discharge and photolysis catalytic purification to realize the purification of oil fume and odor;

Step 4: The gas purified by the plasma is discharged through the exhaust tower under the action of the traction fan, collected and monitored by the gas detection module.

Compared with the prior art, the present invention has the beneficial effects that the present invention solves the problems of low effect, poor selectivity of exhaust gas, and unsuitable process conditions for waste gas treatment in existing heat treatment workshops.

According to the actual situation of heat treatment and processing, the invention can realize high-efficiency purification of various types of smoke, dust, oil fume, hydrocarbons and other harmful gases on the basis of the selection of purification modules. The invention is green and environmentally friendly, has reasonable and compact device structure, convenient maintenance and installation, stable performance, good purification effect and high purification efficiency, has strong pertinence and practicability, and overcomes the small application range, high investment and insufficient purification of current purification devices. Wait enough.

Description of drawings

FIG. 1 is a schematic structural diagram of a plasma purification device for waste gas in a heat treatment workshop according to the present invention.

1-Mechanical dust removal module, 2-Exhaust gas washing module, 3-Plasma primary purification module, 4-Plasma secondary purification module, 5-Main control module, 6-Centrifugal separator, 7-Electrostatic adsorption component, 8- Mechanical filter element filter screen, 9-dust hopper, 10-washing tower, 11-gas drying part, 12-first gas distribution plate, 13-dielectric barrier discharge assembly, 14-photolysis catalytic plate, 15-second gas Distribution plate, 16-needle mesh discharge assembly, 17-activated carbon fiber filter, 18-traction fan, 19-exhaust tower, 20-gas detection module, 21-power system module.

Detailed ways

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention.

Referring to FIG. 1 , the present embodiment is described, a plasma purification device for waste gas in a heat treatment workshop, which includes a mechanical dust removal module 1 , an exhaust gas washing module 2 , a plasma primary purification module 3 and a plasma secondary purification module 4 arranged in series in sequence horizontally. , the mechanical dust removal module 1 performs mechanical dust removal and separation on granular soot and dust in the exhaust gas, the exhaust gas washing module 2 purifies and separates the water-soluble pollutants in the exhaust gas, and the plasma primary purification module 3 includes The first gas distribution plate 12, the dielectric barrier discharge assembly 13 and the photolysis catalytic plate 14, the first gas distribution plate 12 is located in front of the dielectric barrier discharge assembly 13, the number of the dielectric barrier discharge assemblies 13 is multiple, and the adjacent dielectric barrier A photolysis catalytic plate 14 is placed between the discharge assemblies 13. The dielectric barrier discharge assembly 13 includes a hollow cylindrical test tube structure and a rod-shaped electrode. The hollow cylindrical test tube structure is a dielectric barrier layer, and the rod-shaped electrode is fixed on the hollow cylindrical test tube structure. A single electrode is formed in the center, the number of the single electrodes is multiple, and the multiple single electrodes are arranged in an array structure. Connected to the power supply in a parallel manner, the plasma secondary purification module 4 includes a second gas distribution plate 15, a needle mesh discharge assembly 16 and an activated carbon fiber filter screen 17, and the second gas distribution plate 15 is located in the needle mesh discharge assembly. In front of 16, the activated carbon fiber filter screen 17 is located behind the needle net discharge assembly 16. The needle net discharge assembly 16 uses a single needle as the electrode of the pulse power supply, and the mesh electrode is grounded to realize corona discharge at the needle tip. The stage purification module 4 is connected to the exhaust tower 19 to discharge the treated gas.

In this embodiment, the overall installation or module selection can be carried out according to the actual situation of the heat treatment process. In the overall structure of the device, each module is arranged in a horizontal series. The mechanical dust removal module 1 includes a centrifugal separator 6, an electrostatic adsorption component 7 and a mechanical filter element filter 8. The centrifugal separator 6, the electrostatic adsorption assembly 7 and the mechanical filter element filter 8 are connected in sequence, which can mechanically dedust and separate the particulate soot, dust, etc. in the exhaust gas. Clean up regularly. The exhaust gas washing module 2 includes a washing tower 10 and a gas drying part 11. The washing tower 10 is connected with the gas drying part 11, and can purify and separate water-soluble pollutants in the exhaust gas, and then perform gas drying. The function of the first gas distribution plate 12 and the second gas distribution plate 15 is to uniformly distribute the gas, which is beneficial to the subsequent plasma purification. The hollow cylindrical test tube structure is made of ceramic or quartz material, the rod-shaped electrode is made of stainless steel, and the dielectric barrier The discharge adopts a high-frequency high-voltage power supply, and the power supply is connected to a single electrode in a parallel manner. The photolysis catalytic plate 14 is a honeycomb aluminum base, and the surface is coated with a nano-photolysis catalyst. Purify. The needle mesh discharge assembly 16 uses a single needle as the electrode of the high-voltage pulse power supply, and the mesh electrode is grounded to realize corona discharge at the needle tip. The rear activated carbon fiber filter screen 17 mainly uses activated carbon fiber for the final adsorption and filtration, and the plasma secondary purification module 4 Mainly to achieve purification of odors. The purification device also includes a main control module 5, which is respectively connected with the mechanical dust removal module 1, the exhaust gas washing module 2, the plasma primary purification module 3 and the plasma secondary purification module 4, and the main control module 5 is respectively connected with the gas detection module. The module 20 is connected to the power system module 21, and the exhaust tower 19 is provided with a traction fan 18. Under the action of the power system module 21, the gas passing through the plasma secondary purification module 4 passes through the exhaust tower under the action of the traction fan 18. 19 is discharged, and the gas detection module 20 can collect and analyze the composition and air pressure of each process gas in real time, monitor the working status of each module in the whole process and guide the process.

The present invention also includes a plasma purification method for waste gas in a heat treatment workshop, which comprises the following steps:

Step 1: The exhaust gas generated in the heat treatment process first enters the mechanical dust removal module 1, and the exhaust gas passes through the centrifugal separator 6, the electrostatic adsorption component 7 and the mechanical filter element filter 8 in turn to remove the granular soot and dust, and the separated soot and dust fall into the accumulation area. Dust bucket, follow-up cleaning;

Step 2: The exhaust gas after mechanical dust removal enters the exhaust gas washing module 2, and the water-soluble pollutants in the exhaust gas are purified and separated by the washing tower 10, and then the gas is dried by the gas drying component 11;

Step 3: The exhaust gas after the exhaust gas washing enters the plasma primary purification module 3 and the plasma secondary purification module 4 in turn, and carries out plasma discharge and photolysis catalytic purification to realize the purification of oil fume and odor;

Step 4: The gas purified by the plasma is discharged through the exhaust tower 19 under the action of the traction fan 18 and collected and monitored by the gas detection module 20 .

A plasma purification device and purification method for waste gas in a heat treatment workshop provided by the present invention have been described above in detail. In this paper, specific examples are used to illustrate the principles and implementations of the present invention. The descriptions of the above embodiments are only for the purpose of Help to understand the method of the present invention and its core idea; at the same time, for those skilled in the art, according to the idea of the present invention, there will be changes in the specific implementation and application scope. In summary, the content of this specification It should not be construed as a limitation of the present invention.

Claims (10)

1. The utility model provides a heat treatment workshop waste gas plasma purifier which characterized in that: it includes horizontal mechanical dust removal module (1), waste gas washing module (2), plasma first grade purification module (3) and plasma second grade purification module (4) that series arrangement in proper order, mechanical dust removal module (1) carries out mechanical type dust removal separation to graininess smoke and dust in the waste gas, waste gas washing module (2) purifies the separation to the water-soluble pollutant in the waste gas, plasma first grade purification module (3) are including first gas distribution board (12), dielectric barrier discharge subassembly (13) and photodissociation catalysis board (14), first gas distribution board (12) are located dielectric barrier discharge subassembly (13) the place ahead, dielectric barrier discharge subassembly (13) quantity is a plurality of, places photodissociation catalysis board (14) between adjacent dielectric barrier discharge subassembly (13), dielectric barrier discharge subassembly (13) include hollow cylinder test tube structure and bar electrode, the hollow cylinder test tube structure is a medium barrier layer, the rod-shaped electrodes are fixed at the center of the hollow cylinder test tube structure to form a plurality of single electrodes, the single electrodes are arranged in an array structure, two single electrodes form a counter electrode, more than two counter electrodes form a medium barrier discharge assembly (13), the single electrodes are connected with a power supply in a parallel mode, the plasma secondary purification module (4) comprises a second gas distribution plate (15), a needle net discharge assembly (16) and an activated carbon fiber filter screen (17), the second gas distribution plate (15) is positioned in front of the needle net discharge assembly (16), the activated carbon fiber filter screen (17) is positioned behind the needle net discharge assembly (16), the needle net discharge assembly (16) adopts a single needle as an electrode of a pulse power supply, the mesh electrode is grounded, and needle point corona discharge is realized, and the plasma secondary purification module (4) is connected with an exhaust tower (19) and discharges the treated gas.

2. The plasma purification apparatus for exhaust gas of heat treatment plant according to claim 1, characterized in that: the purification device further comprises a main control module (5), wherein the main control module (5) is respectively connected with the mechanical dust removal module (1), the waste gas washing module (2), the plasma primary purification module (3) and the plasma secondary purification module (4).

3. The plasma purification apparatus for exhaust gas of heat treatment plant according to claim 1, characterized in that: the main control module (5) is respectively connected with the gas detection module (20) and the power system module (21).

4. The plasma purification apparatus for exhaust gas of heat treatment plant according to claim 1, characterized in that: the photolysis catalysis plate (14) is a honeycomb-shaped aluminum base, and the surface of the photolysis catalysis plate is coated with a nano photolysis catalyst.

5. The plasma purification apparatus for exhaust gas of heat treatment plant according to claim 1, characterized in that: the hollow cylindrical test tube structure is made of ceramic or quartz materials.

6. The plasma purification apparatus for exhaust gas of heat treatment plant according to claim 1, characterized in that: the rod-shaped electrode is made of stainless steel material.

7. The plasma purification apparatus for exhaust gas of heat treatment plant according to claim 1, characterized in that: mechanical dust removal module (1) includes centrifuge (6), electrostatic absorption subassembly (7) and mechanical filter core filter screen (8), centrifuge (6), electrostatic absorption subassembly (7) and mechanical filter core filter screen (8) link to each other in proper order, mechanical dust removal module (1) below is provided with laying dust hopper (9).

8. The plasma purification apparatus for exhaust gas of heat treatment plant according to claim 1, characterized in that: the waste gas washing module (2) comprises a washing tower (10) and a gas drying component (11), and the washing tower (10) is connected with the gas drying component (11).

9. The plasma purification apparatus for exhaust gas of heat treatment plant according to claim 1, characterized in that: and a traction fan (18) is arranged in the exhaust tower (19).

10. A purification method of the plasma purification apparatus for exhaust gas of heat treatment plant according to claim 1, characterized in that: it comprises the following steps:

the method comprises the following steps: waste gas generated in the heat treatment process firstly enters a mechanical dust removal module (1), the waste gas sequentially passes through a centrifugal separator (6), an electrostatic adsorption component (7) and a mechanical filter element filter screen (8) to remove granular smoke dust and dust, the separated smoke dust and dust fall into a dust accumulation hopper, and then the dust accumulation hopper is cleaned;

step two: the waste gas after mechanical dust removal enters a waste gas washing module (2), water-soluble pollutants in the waste gas are purified and separated through a washing tower (10), and then gas drying is carried out through a gas drying component (11);

step three: the waste gas after being washed enters a plasma primary purification module (3) and a plasma secondary purification module (4) in sequence, and is subjected to plasma discharge and photolysis catalytic purification, so that the purification of oil smoke and smell is realized;

step four: the gas purified by the plasma is discharged through an exhaust tower (19) under the action of a traction fan (18) and the collection and monitoring of a gas detection module (20).

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