WO2008131605A1 - Transferring arc device of plasma generator - Google Patents

Abstract

A transferring arc device of plasma generator comprises a transferring arc body (1) and a transferring arc head (3) which are made of cylindraceous magnetic and thermal conducting material, the external surface of the transferring arc head (3) have many alternate radiators (2) and wind cooling grooves (4) in axially, the transferring arc body (1) and the transferring arc head (3) are connected or founded to form an integrated structure, one end of the transferring arc body (1) is set on an anode, and is connected with an anode nozzle, one end of the transferring arc head (3) extends where arc plasma is demanded to arrive at.

Description

 BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention discloses a conveying arc device for a plasma generator, which is an auxiliary device of a plasma generator. BACKGROUND OF THE INVENTION DC atmospheric pressure arc plasma is one of the most widely studied plasma states. Because of the influence of the swirling and arc-stabilizing arc, the high-temperature and high-speed jet of the arc plasma is very serious in the entrapment of the surrounding gas after leaving the anode nozzle. The hot and cold airflow is rapidly mixed together, and the energy of the jet is rapidly attenuated, resulting in rapid decay of the jet. The arc plasma cools down in a short time and the gradient of the axial temperature is large. It is characterized by a short arc plasma jet length and can only obtain a high temperature effect at a distance close to the nozzle. Therefore, in a specific environment, such as a plasma ignition system of a pulverized coal boiler, when the arc plasma jet is delivered into the center cylinder of the plasma burner far from the anode nozzle, the temperature of the arc plasma jet reaching the center cylinder is very high. Low, causing pulverized coal to fail to ignite. If the current is increased or the medium gas flow rate is increased, on the one hand, the effect is not obvious in the case of a long distance, and on the other hand, the anode and the cathode head of the generator may cause greater damage. SUMMARY OF THE INVENTION It is an object of the present invention to provide a delivery arc device for a plasma generator that successfully solves the technical problem of delivering an arc plasma farther away from the anode nozzle under certain conditions of use.

 The object of the present invention is achieved in that the device is composed of a cylindrical arc-transferring and heat-conducting material conveying arc body and a conveying arc head, and the outer surface of the conveying arc head is axially interposed between the fin and the air-cooling groove. The conveying arc body and the conveying arc are first connected or cast into one body, and one end of the conveying arc body is sleeved on the anode of the plasma generator, and is connected with the anode nozzle, and the first end of the conveying arc extends to a place where the arc plasma is required to reach.

 The conveying arc device of the plasma generator as described above is coated with an insulating layer on the outer surface of the conveying arc.

 As the conveying arc device of the plasma generator as described above, the structure of the conveying arc head may be straight or curved, and the arc angle of the curved arc of the curved structure is between zero and ninety degrees. Realize the transmission of various conditions of arc plasma.

 The advantages of the invention are:

 1. It can continuously and stably transfer the arc plasma to a place far away from the anode nozzle, ensuring that the arc plasma can be applied to a large number of special environments;

2. The length of the anode holder, the cathode rod and the anode in the plasma generator is reduced, which saves a large Cost of quantity;

 3. Reduce maintenance space, reduce maintenance procedures and reduce maintenance costs;

 4. The application of arc plasma has been promoted to make arc plasma more flexible and applicable to various fields and different aspects in the same field. Especially for the ignition system of pulverized coal boilers, it saves the country huge sums of money and a lot of fuel. Brief Description of the Drawings Fig. 1 is a schematic structural view showing an embodiment of a conveying arc device of a plasma generator according to the present invention.

 Fig. 2 is a structural schematic view showing another embodiment of a conveying arc device of the plasma generator of the present invention. Embodiments of the Invention The present invention is composed of a conveying arc and a conveying arc. It continuously and stably transports the arc plasma from the nozzle of the anode to a specified place without changing the temperature of the arc plasma generated by the plasma generator and entraining the surrounding gas. The materials used in the device are magnetically conductive, thermally conductive materials such as iron, copper, and the like. After the device is used in the plasma generator, the arc plasma ejected from the anode nozzle can be transported to the designated distal end, and after the delivery is completed, the temperature change of the arc ion jet is small, and other properties are not significantly changed. .

 Since the entire conveying arc device is made of a magnetically permeable material, when the anode vent is inserted into the device and abuts the device, the magnetic field generated by the coil energization is also axially distributed in the conveying arc device, because the magnetic field can effectively The compressed arc plasma increases the rigidity of the arc and arc plasma jets, and continuously delivers the arc plasma to a location far from the plasma generator nozzle.

 On the outer surface of the conveying arc, there are axially spaced fins and air-cooling grooves, which increases the contact surface with the external atmosphere, and can quickly dissipate the heat generated by the arc of the arc due to contact arc and arc plasma, ensuring transportation. The life of the arc working; the swirling gas from the generator can be continued inside the conveying arc, thus ensuring the high concentration of the laminar arc plasma energy of the arc plasma in the swirling gas, and efficiently transporting the arc plasma to the designated The far end.

 Under special conditions of use, for example: in an igniting system for pulverized coal boilers, part of the outer surface of the device is coated with a heat-resistant insulating layer, which avoids the contact between the arc-feeding device and the plasma burner. The large attenuation ensures the strength of the internal magnetic field of the arc during normal operation.

The following is further illustrated by the example shown in the drawings - in the figure: 1 is the conveying arc, 2 is the fin, 3 is the conveying arc, and 4 is the air cooling trough. Embodiment 1: The conveying arc 1 and the conveying arc head 3 in Fig. 1 are respectively composed of a magnetic conductive and heat conducting material. The conveying arc 1 is welded to the conveying arc head 3, wherein the outer surface of the conveying arc 1 is coated with an insulating layer, and the outer surface of the conveying arc head 3 is provided with a fin and an air cooling groove. The transport arc is at an angle of 180 degrees between the arc and the arc of the transport to achieve axial transmission of the arc plasma.

 Embodiment 2: Fig. 2 shows a conveying arc device for realizing a radial rotation axial direction of a plasma generator. The structure of the conveying arc is curved, and the angle of the curved arc is between zero and ninety degrees, and the angle is adjusted according to the specific application.

 Embodiment 3: The conveying arc 1 and the conveying arc head 3 in Figs. 1 and 2 are cast into a whole by a magnetic conductive and heat conducting material, and other structures and processes are exactly the same as those in Fig. 1 or Fig. 2.

Claims

Claim A conveying arc device for a plasma generator, characterized in that the device is composed of a cylindrical arc-conducting and heat-conducting conveying arc body and a conveying arc head, and the outer surface of the conveying arc head is axially dispersed throughout the heat dissipation. The sheet and the air-cooling tank, the conveying arc body and the conveying arc are first connected or cast into one body, and one end of the conveying arc body is sleeved on the anode and connected with the anode nozzle, and the first end of the conveying arc extends to the place where the arc plasma is required to arrive. .  A transfer arc device for a plasma generator according to claim 1, wherein: the outer surface of the transport arc is coated with an insulating layer.  3. The apparatus of claim 1, wherein the conveying arc head structure can be straight or curved, and the arc angle of the curved arc of the curved structure. Between zero and ninety degrees.