Novel plasma generator based on flash heating

Abstract

The invention discloses a novel plasma generator based on flash heating, belongs to the field of plasmas, and particularly relates to a pair of special carbon fiber reinforced electrodes for generating plasmas by utilizing flash heating. A carbon felt tube, a carbon felt rod, a positive electrode connected with a power supply and a negative electrode connected with a power supply are respectively arranged on two sides of the carbon felt electrode, a carbon fiber array is arranged on the surface, long carbon fibers extend and contact, and short carbon fibers are arranged perpendicular to the surface. After the generator is started, the defect point resistance of the long carbon fiber is high, the flash heating effect is remarkable, and spark discharge occurs at the fiber gap to trigger plasma; enhanced electric fields generated by the tips of the densely arranged short carbon fibers converge on the surfaces of the electrodes, so that uniform and stable plasmas are formed in a plasma generation region. Uniform, stable and ultrahigh-temperature (8000K) plasmas can be generated under the atmospheric pressure, the problems that a traditional plasma generator is poor in uniformity and stability and limited in temperature range are solved, and a new breakthrough of the plasma technology is achieved.

Description

Technical Field

[0001] The present invention belongs to the field of plasma, and in particular relates to a pair of specially made carbon fiber reinforced electrodes, and in particular utilizes flash heating to generate plasma. Background Art

[0002] Plasma can create an ultra-high temperature environment and is used for the synthesis and processing of various high-temperature resistant materials, elemental content analysis of refractory alloys, etc., and has broad application prospects. One way to generate plasma is to use a high-voltage discharge device to ionize argon gas, and use a high-frequency induction coil to generate huge heat energy and an alternating magnetic field to treat the gas. As various particles move at high speed, the gas is completely ionized to form a coil-shaped plasma torch area, where the temperature is as high as 8000K. However, the limited volume, instability and unevenness of plasma make this method less practical. The present invention proposes a new type of plasma generator based on flash heating, which can generate uniform, stable, ultra-high temperature plasma under atmospheric pressure. Summary of the Invention

[0003] The object of the present invention is to specify an improved embodiment or at least an alternative embodiment for the plasma-generated production of high-temperature-resistant materials, which embodiment in particular overcomes the disadvantages known from the prior art.

[0004] The present invention is based on the general idea of ​​utilizing flash heating to generate ultra-high temperature plasma in a uniform and stable manner, and in particular relates to a pair of specially made carbon fiber reinforced electrodes.

[0005] The technical solutions of the present invention are as follows:

[0006] A novel plasma generator based on flash heating is characterized by comprising a power supply, a carbon felt electrode, a carbon fiber array and other parts;

[0007] The carbon felt electrode includes a carbon felt tube and a carbon felt rod, which are respectively connected to the positive and negative electrodes of the power supply. A carbon fiber array is vertically arranged on the surface, and the carbon fiber array includes long carbon fibers and short carbon fibers.

[0008] The defective points of the long carbon fibers have a relatively high electrical resistance. When voltage is applied by a power supply, a significant flash heating effect occurs there, causing a sudden temperature rise. After the temperature rises instantaneously, the fibers break, forming extremely small gaps. A locally enhanced electric field is generated at the newly formed fiber tips, which promotes the emission of secondary electrons, causing spark discharges in the narrow fiber gaps to trigger plasma. Simultaneously, an enhanced electric field is generated at the tips of the short carbon fibers, merging with the surface of the carbon felt electrode, promoting the diffusion of local plasma and forming a uniform and stable plasma between the electrodes.

[0009] Preferably, the power supply can provide low current and voltage (<50A and <50V), without the need for expensive high-power power supply and control, and comes with a switch that can be used to start and stop the novel plasma generator.

[0010] Through the above technical solutions, the present invention can achieve the following beneficial effects:

[0011] 1. The device of the present invention has a simple structure and low cost. The required carbon materials are easily available and can generate plasma at a low cost.

[0012] 2. The present invention can generate plasma uniformly and stably under atmospheric pressure, with a temperature as high as 8000K. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] The invention is described in more detail below based on the preferred embodiments shown in the accompanying drawings. However, the scope of the invention to be protected should not be limited to the description shown or described below, but should be defined by the appended claims. In the accompanying drawings,

[0014] Figure 1 shows a schematic cross-sectional view of a novel plasma generator based on flash heating according to a preferred embodiment of the present invention;

[0015] Figure 2 1 shows a schematic top view of a novel plasma generator based on flash heating according to a preferred embodiment of the present invention (enlarged at a ratio of 2:1).

[0016] The meanings of the reference numerals are as follows:

[0017] 100. Plasma generator; 101. Carbon felt tube; 102. Plasma generating domain; 103. Carbon felt rod; 104. Power supply; 105. Switch; 106. Long carbon fiber; 107. Short carbon fiber. DETAILED DESCRIPTION

[0018] refer to Figure 1 According to a preferred embodiment of the present invention, a novel plasma generator 100 based on flash heating includes a carbon felt tube 101 , a plasma generating domain 102 , a carbon felt rod 103 , a power supply 104 and a switch 105 .

[0019] Power supply 104 provides voltage to the carbon felt electrodes. Its positive electrode is connected to carbon felt tube 101, and its negative electrode is connected to carbon felt rod 103. Cylindrical carbon felt rod 103 is placed within the hollow carbon felt tube 101, with plasma generating zone 102, containing a carbon fiber array, located between the two. Closing switch 105 and turning on power supply 104 causes plasma to be generated within plasma generating zone 102.

[0020] In particular, Figure 2A schematic top view of the novel plasma generator is shown, allowing a clearer view of the arrangement of the carbon fiber array within the plasma generating region 102. Both long carbon fibers 106 and short carbon fibers 107 are arranged perpendicularly to the surfaces of the carbon felt tube 101 and carbon felt rod 103. The long carbon fibers 106 on either side of the carbon felt electrode have small gaps and are easily accessible, while the short carbon fibers 107 are numerous and densely packed.

[0021] The working principle of the present invention is as follows:

[0022] When the plasma generator 100 is started, the switch 105 is closed and the power supply 104 is turned on. The long carbon fibers 106 initiate plasma in the plasma generating domain 102, and then the short carbon fibers 107 expand the plasma so that it can be evenly and stably arranged in the plasma generating domain 102. Under the coupling effect of the long carbon fibers 106 and the short carbon fibers 107, the plasma generator 100 can generate uniform, stable, ultra-high temperature plasma under atmospheric pressure.

[0023] The above is only a preferred embodiment of the present invention. It should be pointed out that for those skilled in the art, several improvements can be made without departing from the principles of the present invention. These improvements should also be considered as the scope of protection of the present invention.

Claims

1. A novel plasma generator based on flash heating for generating plasma, particularly a pair of specially made carbon fiber reinforced electrodes, characterized in that: Plasma is generated by flash heating. The plasma generator includes a carbon felt electrode, a carbon fiber array and a power supply. The power supply is equipped with a switch to supply energy to the carbon felt electrode. The switch is arranged between the carbon felt electrode and the power supply to control the start and stop of the plasma generator.

2. The tailor-made carbon fiber reinforced electrode according to claim 1, characterized in that: On both sides are carbon felt tubes and carbon felt rods, which are connected to the positive and negative poles of the power supply. In between is the plasma generating domain, where a carbon fiber array is arranged. The carbon fiber array includes long carbon fibers and short carbon fibers, wherein the long carbon fibers extend and contact, and the short carbon fibers are densely arranged in an array on the electrode surface.

3. The carbon felt tube and carbon felt rod according to claim 2, characterized in that: The use of carbon materials greatly reduces the cost of generating plasma.

4. The power supply according to claim 1 or 2, characterized in that: It can provide low current and voltage (<50A and <50V), without expensive high-power power supply and control. The power supply is provided with a switch, and when the switch is closed, the plasma generator is started to generate uniform and stable ultra-high temperature plasma.

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