CN201242995Y - Plasma generator for sterilizing gas - Google Patents

Abstract

The plasma generator used for gas disinfection has a shell, and the shell is provided with an air inlet and an exhaust port, and a microstructure composed of an anode layer, an insulating layer, and a cathode layer stacked from top to bottom is installed in the shell. Discharge structure, on the surface of the anode layer and the insulating layer, there are a number of micropores with vertical and horizontal equal distances and equal apertures; electrodes opposite to the micropores are fixed at 1-5 cm above the anode layer; the utility model The new type can sterilize large-area and large-capacity toxic gases, especially volatile toxic gases such as methane and benzene, to obtain clean gas, because the utility model can directly work in the air of atmospheric pressure or superatmospheric pressure , especially suitable for the treatment of industrial toxic gases.

Description

Plasma generators for gas disinfection

(1) Technical field: the utility model belongs to environmental protection equipment, specifically a kind of plasma generator for gas disinfection.

(2) Background technology: At present, the more mature technologies for disinfection of gas mainly include: ultraviolet disinfection, ozone disinfection, negative ion disinfection, etc., but they also have certain defects. The first is that it will cause certain harm to the human body. It is not suitable for large-area and large-capacity gas disinfection.

(3) Summary of the invention: the purpose of this utility model is to provide a plasma generator for gas disinfection; this plasma generator is based on the research results of high-pressure gas discharge in recent years, combined with industrial disinfection of toxic gases To deal with the increasing demand, it is designed by using the characteristics of non-thermal plasma source that can generate large volume of high pressure discharge plasma, which can disinfect large area and large capacity of toxic gas without causing harm to human body.

The utility model has a shell, which is provided with an air inlet and an exhaust port, and is characterized in that: a micro-discharge structure composed of an anode layer, an insulating layer, and a cathode layer stacked sequentially from top to bottom is installed in the shell, On the surface of the anode layer and the insulating layer, a number of micropores with equal vertical and horizontal distances and equal pore diameters are distributed; electrodes opposite to the micropores are fixed at 1-5 cm above the anode layer.

The anode layer, insulating layer and cathode layer are molybdenum sheet, Al ₂ O ₃ ceramic sheet and molybdenum sheet respectively.

The diameter of the micropores is 100 μm-250 μm.

The electrodes are tungsten needles.

An insulator is arranged between the cathode layer of the micro-discharge structure and the casing.

The design principle of the utility model is: the plasma volume formed by the single micro-discharge structure formed by the anode layer, the insulating layer and the cathode layer is too small, and a large-volume high-pressure glow discharge plasma is required for industrial application; therefore , analogous to similar discharge forms, the utility model adopts a micro-discharge structure and a third electrode (tungsten needle), the third electrode is placed on the anode side of the micro-discharge structure as the anode of the entire discharge, and electrons are extracted from the micro-discharge. The microdischarge acts as the cathode of the entire discharge. Using this structure to generate a stable DC glow discharge plasma with a scale of centimeters in atmospheric pressure air, the electron density can reach 10 ¹⁴ cm ^-3 , and the discharge structure has positive differential resistance characteristics in the entire discharge area. A large number of parallel operations can be performed without ballast resistors to form a larger discharge array. Therefore, a large number of self-sustained glow discharge arrays operate in parallel to form a plasma generator to generate a large volume of discharge plasma, which can sterilize industrial toxic gases.

The utility model is a glow discharge with high pressure and stability. The discharge pressure can reach or even exceed the atmospheric pressure. Its main features are: (1) There is non-thermal electron energy distribution, and the discharge area forms a high current density, and the electron density is between 10 ¹³ - 10 ¹⁶ cm ^-3 (DC discharge or pulsed DC discharge); (2) There is a very high power density in the discharge plasma. Because the discharge plasma has extremely high power density (generally greater than 10 ³ kW/cm ³ ), extremely high density of high-energy electrons (generally greater than 10 ¹³ cm ^-3 ), and extremely high gas temperature (generally greater than 2000K), these make It can effectively decompose gas and can be used to sterilize volatile toxic gases such as methane and benzene; (3) adopt pulsed DC discharge mode, which can increase the discharge power by about 50%; (4) adopt the combination of gas flow and diffusion cooling This method can quickly take away a large amount of heat generated by the discharge, reduce power loss, and improve the efficiency of the plasma generator. Controlling the flow rate of the polluting gas can effectively cool the discharge. In addition, the entire discharge shell is made of aluminum alloy with good heat dissipation effect to improve the effect of diffusion cooling; (5) Since the discharge pressure of the designed plasma generator can reach or even The pressure exceeds the atmospheric pressure, so the plasma generator requires less sealing, which reduces the manufacturing difficulty of the disinfection device.

(4) Description of drawings:

Fig. 1 is a schematic view of the overall structure of an embodiment of the utility model in a top view direction;

Fig. 2 is a schematic diagram of the cross-sectional structure of A-A' in Fig. 1;

Fig. 3 is a schematic diagram of the basic structure of a single micro-discharge;

Fig. 4 is a schematic diagram of a parallel operation structure of a self-sustained glow discharge composed of two micro-discharges and two tungsten needle electrodes.

(5) Specific implementation methods:

See Figure 1, Figure 2, Figure 3, and Figure 4, in the figure, 1-housing, 2-air inlet, 3-air outlet, 4-anode layer, 5-insulation layer, 6-cathode layer, 7-micro Hole, 8-tungsten needle electrode, 9-hole, 10-insulator, 11-ceramic tube.

The utility model has a housing 1 on which an air inlet 2 and an air outlet 3 are arranged. Generally, the air inlet and air outlet are arranged so that their central axis just passes through the plasma; referring to FIG. 1 , this embodiment adopts The shell is made of aluminum alloy material and subjected to oxygen polarization treatment; the shell is in the shape of a cuboid, and the shell is equipped with a micro-discharge structure composed of an anode layer 4, an insulating layer 5, and a cathode layer 6 sequentially stacked from top to bottom. Among them, the cathode layer and the anode layer are made of molybdenum sheets with a thickness of 0.1-0.2mm, and the insulating layer in the middle is made of Al ₂ O ₃ ceramic sheets with a thickness of generally 0.2-0.4mm. The cathode layer, the insulation layer and the anode layer are bonded together connected together. Distributed on the surface of the anode layer and the insulating layer are some micropores 7 that are equally spaced vertically and horizontally and have equal apertures. An opposite electrode 8, which generally uses a tungsten needle. In this embodiment, a hole 9 is drilled directly on the casing above the anode layer, and a tungsten needle electrode is placed in it. It is also possible to fix a suspension plate at an appropriate distance above the anode layer, punch out some holes one by one relative to the micropores on the suspension plate, and then install tungsten needle electrodes in the holes, which can also achieve the purpose of the present utility model. As shown in Figure 2, an insulator 10 is arranged between the cathode layer 6 and the housing of the micro-discharge structure, and all electrodes are insulated and isolated from the aluminum alloy housing by an insulating ceramic tube 11, the cathode layer, the anode layer and the tungsten needle electrode are respectively connected to the corresponding power supply.

The utility model is placed in the treatment chamber, the toxic gas enters through the air inlet, and flows out from the gas outlet after being treated. Experiments show that the removal of methane reaches 80%, and the removal of benzene reaches 90%.

Claims (5)

1. the plasma generator that is used for gas depoisoning, has housing, housing is provided with air inlet and exhaust outlet, it is characterized in that: the micro discharge structure that is overlapped successively from top to bottom by anode layer, insulating barrier, cathode layer is housed in housing, is distributed with some micropores equidistant in length and breadth, that the aperture equates at described anode layer and surface of insulating layer; The 1-5cm place is fixed with and described micropore electrode of opposite one by one above described anode layer.

2. the plasma generator that is used for gas depoisoning according to claim 1 is characterized in that: described anode layer, insulating barrier, cathode layer are respectively molybdenum sheet, Al ₂O ₃Potsherd, molybdenum sheet.

3. the plasma generator that is used for gas depoisoning according to claim 1 and 2 is characterized in that: the aperture of described micropore is 100 μ m-250 μ m.

4. the plasma generator that is used for gas depoisoning according to claim 1 is characterized in that: described electrode is the tungsten pin.

5. the plasma generator that is used for gas depoisoning according to claim 1 is characterized in that: be provided with insulator between described micro discharge structure cathode layer and the housing.

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