CN210958932U - Thermal plasma generator - Google Patents

Abstract

The utility model discloses a thermal plasma generator, which comprises a gun tip electrode, an electrode mounting seat, an auxiliary electrode, a refractory material protective layer, a refractory material protection pipe, an air pipe, a working gas inlet and a torch outlet. In the utility model, according to the characteristics of waste gas treatment, the structure of the gun head of the thermal plasma generator is improved, so that the discharge area can move dynamically with the electro-erosion loss of the electrode of the gun head, so as to prolong the service life of the gun head. In addition, in order to reduce the power consumption of the generator device, an auxiliary electrode is added inside the gun head, so that the gun head electrode can use a lower voltage high-current direct current to "continue the arc". The control of the high-voltage power supply makes the "arc ignition" of the tip electrode easier, and also makes the "continuation arc" of the tip electrode more difficult to break the arc.

Description

a thermal plasma generator

technical field

The utility model relates to the technical field of environmental protection, relates to a thermal plasma generating device, in particular to a thermal plasma generator.

Background technique

Thermal plasma technology is a very valuable treatment technology introduced into the field of environmental protection in recent years. Thermal plasma technology can convert electrical energy into heat-concentrated heat energy. The temperature generated by the energy-concentrated area can reach 3000 ° C to 5000 ° C. ℃, within this temperature range, it can completely decompose some difficult-to-decompose substances, such as dioxins and solid wastes in the exhaust gas.

The key components in the thermal plasma generating device, such as the torch tip for generating the thermal plasma torch, the service life of the torch tip and the power consumption of the device are the two major factors that affect the application of the thermal plasma generating device in the field of environmental protection. At present, although the service life of the gun head has reached 300h to 600h, there is still a big gap from the market requirements. At the same time, the high power consumption of the thermal plasma generation device itself is also a key problem that needs to be solved urgently.

The service life of the gun head and the power consumption of the device are related to the structure of the gun head and the discharge method used. According to the application characteristics of thermal plasma technology in the field of environmental protection, the two important contents of the present utility model are: 1. to improve the structure of the gun head; 2. to innovate the discharge method of the gun head.

Utility model content

The purpose of the utility model is to make up for the defects of the prior art, and to provide a thermal plasma generator structure applied in the field of environmental protection. move, thereby extending the life of the tip. At the same time, in order to reduce the power consumption of the device, the electrode of the gun tip uses high-current low-voltage direct current to "continue the arc", and through the control of the arc-starting power supply and the pulsed high-voltage power supply, the "arc-striking" of the electrode of the gun tip and the replacement of the gun head are realized. The uninterrupted "continuation arc" of the electrodes creates the conditions.

The utility model is achieved through the following technical solutions:

A thermal plasma generator includes a refractory material protection tube, an electrode mounting seat is fixedly installed at one end of the refractory material protection tube, the other end is a torch outlet, and a gun tip electrode is installed inside the refractory material protection tube. One end of the electrode is fixed on the electrode mounting seat, and the other end extends into the inside of the refractory material protection tube. There are two gun tip electrodes, and the distance between the two gun tip electrodes varies with the distance in the long axis direction of the electrode. Change, in which the area with the closest distance between the electrodes of the two gun tips is the arc striking area of the electrode, and the electrode area outside the arc striking area along the gas flow direction is the continuous arc area, and an air duct is also installed on the electrode mounting seat. One end of the air duct extends into the inside of the refractory material protection pipe, and an auxiliary electrode is installed between the air duct and the arc striking area of the electrode of the gun tip. The other end of the air duct is the gas inlet.

The auxiliary electrode is introduced from the electrode mounting seat to the position between the air duct and the arc striking area of the gun tip electrode, or is introduced from the wall of the refractory protection tube to the arc striking area of the air duct and the gun tip electrode. between regions.

The electrode shape at the continuous arc region of the torch tip electrode is linear, sawtooth, or arc.

A refractory protective layer is also provided inside the refractory protection tube, and is installed in close contact with the refractory protection tube.

The inside of the refractory protective layer is a hollow structure, and the refractory material is alumina or zirconia.

The refractory material protection pipe is a piece of metal pipe.

The auxiliary electrode is installed at the front end of the "arc ignition" area of the gun tip electrode. The auxiliary electrode is continuously discharged under the excitation of the pulsed high voltage power supply, and the generated charged particles are sent into the space where the gun tip electrode is located.

Moreover, the charged particles entering the "arc striking" area make the "arc striking" of the gun tip electrode easier, and the charged particles entering the "continuation arc" area make the "continuation arc" of the gun tip electrode difficult to break the arc;

The refractory material protective layer is placed in the refractory material protective pipe, and the refractory material protective layer can be made into a hollow structure of any shape, and is fitted and installed with the refractory material protective pipe.

Moreover, the hollow channel of the refractory protective layer is also the working gas channel of the thermal plasma generator of the present invention;

The refractory material protection pipe is a section of metal pipe used to protect the refractory material protective layer, one end of the refractory material protection pipe is connected with the electrode mounting seat, and the other end is the torch outlet;

The working gas enters the refractory protective layer channel of the utility model through the air duct installed on the electrode mounting seat, the auxiliary electrode generates charged particles under the excitation of the pulsed high-voltage power supply, and the charged particles are sent to the gun under the push of the airflow of the working gas. In the "arc striking" area and the "continuation arc" area of the head electrode, the "arc striking" is performed by the arc striking power supply, and the "arc continuing" is performed by the high current low-voltage DC power supply. The torch generated in the "continuation arc" area is pushed out through the torch outlet by the flow of working gas.

The advantages of the present utility model are: 1. The utility model is improved in the electrode of the gun tip, and the electrode area of "continuation arc" is increased, and any point of electrical erosion loss can be automatically replaced by other "continuation arc" areas, which prolongs the life of the gun tip electrode. service life.

2. The auxiliary electrode added by the utility model makes the "arc striking" of the gun tip electrode easier, and at the same time, the "continuation arc" is not easy to break the arc. In addition, a low "continuous arc" DC voltage can be used, and under the same "continuous arc" high current, the additional power consumption of the generator can be greatly reduced.

Description of drawings

FIG. 1 is a schematic half-section view of the structure of the device of the present invention.

FIG. 2 is a cross-sectional view taken along the line A-A in FIG. 1 .

FIG. 3 is a structural diagram of a gun tip electrode in FIG. 1 .

Detailed ways

As shown in Figures 1, 2, and 3, a thermal plasma generator structure, the generator includes a torch tip electrode 1, an electrode mounting seat 2, an auxiliary electrode 3, a refractory material protective layer 4, a refractory material protective tube 5, Air duct 6, working gas inlet 7, torch outlet 8;

The gun tip electrode 1 includes two electrodes, the two electrodes are made of metal materials, and the distance between the two electrodes changes with the distance in the direction of the long axis of the electrodes, wherein the closest distance between the two electrodes is the gun. "Arc strike" area of the head electrode.

Moreover, one end of the tip electrode 1 is connected to the electrode mounting seat 2, and the rest of the electrodes are inserted into the hollow interior of the refractory protective layer 4;

The electrode mounting base 2 is equipped with a tip electrode 1, an auxiliary electrode 3, and an air duct 6;

The auxiliary electrode 3 is installed at the front end of the "arc ignition" area of the gun tip electrode 1. The auxiliary electrode 3 is continuously discharged under the excitation of the pulsed high-voltage power supply, and the generated charged particles are sent into the space where the gun tip electrode 1 is located.

Moreover, the charged particles entering the "arc striking" area make the "arc striking" of the gun tip electrode 1 easier, and the charged particles entering the "continuation arc" area make the "continuation arc" of the gun tip electrode 1 difficult to break the arc ;

The refractory protective layer 4 is placed in the refractory protective tube 5 , and the refractory protective layer 4 can be made into a hollow structure of any shape, and is fitted with the refractory protective tube 5 .

Moreover, the hollow channel of the refractory protective layer 4 is also the working gas channel of the thermal plasma generator of the present invention;

The refractory material protection pipe 5 is a section of metal pipe used to protect the refractory material protective layer 4, one end of the refractory material protection pipe 5 is connected to the electrode mounting seat 2, and the other end is the torch outlet 8;

The working gas enters the channel of the refractory material protective layer 4 of the present invention through the air duct 6 installed on the electrode mounting base 2, and the auxiliary electrode 3 generates charged particles under the excitation of the pulsed high-voltage power supply, and the charged particles are driven by the airflow of the working gas. It is sent to the "arc initiation" area and the "continuation arc" area of the electrode 1 of the gun tip, and the "arc initiation" is performed by the arc initiation power supply, and the "arc initiation" is performed by the high-current low-voltage DC power supply. The torch generated in the "continuation arc" area is sent out through the torch outlet 8 under the impetus of the gas flow of the working gas.

The working gas is air or oxygen or other gas, which enters the auxiliary electrode and the electrode area of the gun head along the air duct, and blows the flame in the "continuous arc" area from the flame outlet;

Alternatively, the working gas is exhaust gas, which enters the ionization zone and high temperature zone in the "continuation arc" area, and directly decomposes the exhaust gas.

Claims (6)

1. a thermal plasma generator, it is characterized in that: comprise a refractory material protection tube, at one end of the refractory material protection tube, an electrode mounting seat is fixedly installed, and the other end is a torch outlet, and inside the refractory material protection tube is installed with Tip electrode, one end of the tip electrode is fixed on the electrode mounting seat, and the other end extends into the inside of the refractory material protection tube. There are two tip electrodes, and the distance between the two tip electrodes varies with the length of the electrode. The distance in the axial direction changes, and the area with the closest distance between the two gun tip electrodes is the arc striking area of the electrode, and the electrode area outside the arc striking area along the gas flow direction is the continuous arc area. An air duct is also installed, one end of the air duct extends into the inside of the refractory material protection pipe, and an auxiliary electrode is installed between the air duct and the arc striking area of the gun tip electrode. 2. A thermal plasma generator according to claim 1, characterized in that: the auxiliary electrode is introduced from the electrode mounting seat to the position between the air duct and the arc striking area of the torch tip electrode, Alternatively, it is introduced from the wall of the refractory protection tube to the position between the air duct and the arc striking area of the torch tip electrode. 3 . The thermal plasma generator according to claim 1 , wherein the electrode shape at the continuous arc region of the torch tip electrode is a straight line, a sawtooth shape, or a circular arc shape. 4 . 4 . The thermal plasma generator according to claim 1 , wherein a refractory protective layer is further provided inside the refractory protection tube, and is installed in a fit with the refractory protection tube. 5 . 5 . The thermal plasma generator according to claim 4 , wherein the interior of the refractory protective layer is a hollow structure, and the refractory material is alumina or zirconia. 6 . 6 . The thermal plasma generator according to claim 5 , wherein the refractory protection tube is a piece of metal pipeline. 7 .

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