KR101334848B1 - Plasma Gasifier - Google Patents

Abstract

According to the present invention, an electromagnetic wave supply unit 124 for oscillating an electromagnetic wave of a predetermined frequency; A discharge tube 112 for generating a plasma from the electromagnetic wave and the auxiliary gas; A first gas supply unit 114 for injecting a first auxiliary gas into a vortex form into the discharge tube 112; Pulverized coal supply unit 116 for supplying pulverized coal to the plasma generated inside the discharge tube (112); The first auxiliary gas is formed on the discharge tube 112, and the flow of the first auxiliary gas is controlled so that the first auxiliary gas is changed from a vortex form into a linear motion in a direction parallel to the discharge direction of the plasma. A nozzle unit 118 for generating syngas by reaction with the pulverized coal; And a second gas supply unit 120 for injecting a second auxiliary gas flowing in a direction parallel to the discharge direction of the plasma along the inner wall of the nozzle unit 118.

Description

Plasma Gasifier

The present invention relates to a plasma gasifier, and more particularly, to a process for gasifying coal in a coal gasification combined cycle, and to a plasma gasifier for generating syngas from pulverized coal made of coal particles using plasma.

Integrated Gasification Combined Cycle (IGCC) is a form of generating electricity by converting coal into a synthesis gas composed mainly of hydrogen (H ₂ ) and carbon monoxide (CO), and then turning the gas turbine with this gas. Means development.

Coal gasification combined cycle power generation has the greatest advantage in that it can generate electricity by using the rich reserve of coal resources worldwide. In addition, in the case of coal gasification combined cycle power generation, high thermal efficiency can reduce the generation of carbon dioxide, sulfur oxides, nitrogen oxides and dusts per unit power generation, and can reduce the generation of warm water due to the low ratio of steam turbine output to plant output. It is evaluated as a very environmentally friendly technology. In addition, it is attracting attention as a pivotal technology of future type power generation that can be applied to carbon dioxide separation storage technology, hydrogen production technology, and fuel cell related system.

In the case of coal gasification combined-cycle power generation, there is an advantage in terms of efficiency and environmental pollution, as well as being able to combine with various fields, as compared with conventional thermal power generation using coal. However, in the case of the conventional coal gasification combined cycle power generation system, the coal is gasified by the radiant heat of the high temperature in the gasification process of the coal. Therefore, the preheating of 1300 to 1500 degrees Celsius is required for the operation of the gasifier, And it becomes costly. In addition, since a high pressure of 25 atm or higher is required for gasification, it is very difficult to miniaturize the gasifier itself, and control of the gasifier is also difficult.

In order to solve such a problem, a coal gasification technology using a plasma gasifier has been proposed. When using plasma, it is possible to gasify coal by a low-pressure (1 atm) process as compared with the prior art, and it is advantageous that the gasifier itself can be miniaturized.

In the case of plasma gasifiers, in order to stably generate plasma, an auxiliary gas such as steam is injected into the waveguide in a vortex form. However, when injecting the vortex-shaped auxiliary gas (swirl gas), the coal particles injected by the centrifugal force of the swirl gas escape the plasma, thereby lowering the gasification efficiency.

Korean Laid-Open Patent Publication No. 2011-0012175 (2011.02.09), a plasma gasifier for coal gasification combined cycle

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and an object of the present invention is to improve gasification efficiency by concentrating pulverized coal, which is moved outward from the plasma by the centrifugal force of swirl gas, to the center of the plasma in a plasma gasifier using plasma. The purpose is to provide a plasma gasifier.

Plasma gasifier according to the present invention for achieving the above object, the electromagnetic wave supply unit 124 for oscillating the electromagnetic wave of a predetermined frequency; A discharge tube 112 for generating a plasma from the electromagnetic wave and the auxiliary gas; A first gas supply unit 114 for injecting a first auxiliary gas into a vortex form into the discharge tube 112; Pulverized coal supply unit 116 for supplying pulverized coal to the plasma generated inside the discharge tube (112); The first auxiliary gas is formed on the discharge tube 112, and the flow of the first auxiliary gas is controlled so that the first auxiliary gas is changed from a vortex form into a linear motion in a direction parallel to the discharge direction of the plasma. A nozzle unit 118 for generating syngas by reaction with the pulverized coal; And a second gas supply unit 120 for injecting a second auxiliary gas flowing in a direction parallel to the discharge direction of the plasma along the inner wall of the nozzle unit 118.

According to the plasma gasifier according to the present invention, by changing the flow of the auxiliary gas supplied in the swirl form inside the nozzle portion in a straight line form, the pulverized coal deviating outward from the plasma by the centrifugal force of the swirl gas can be concentrated in the center of the plasma. It is possible to maximize the synthesis gas generation efficiency by the plasma.

1 is a block diagram showing the configuration of a plasma gasifier according to a preferred embodiment of the present invention;
2 is a vertical cross-sectional view showing a portion where the waveguide and the discharge tube of the plasma gasifier according to the present invention is connected;
Figure 3 is a horizontal cross-sectional view showing the configuration of the first gas supply unit according to a preferred embodiment of the present invention and the operation principle of the first auxiliary gas is discharged in a swirl form,
4 is a horizontal cross-sectional view taken along the line AA ′ of FIG. 2 showing the configuration of the guide groove according to the preferred embodiment of the present invention;
5 is a graph showing a state in which the moving speed of the first auxiliary gas for each position inside the nozzle unit is converted by the configuration of the guide groove according to the preferred embodiment of the present invention;
6 is a photograph showing a state in which pulverized coal particles are concentrated and discharged in a center where plasma is formed by a guide groove according to a preferred embodiment of the present invention;
7 is a photograph showing a state in which pulverized coal particles are radially spread and discharged in a state where the guide groove is not provided;
8 is a graph showing the composition of the synthesis gas generated in a state where the guide groove is not provided,
9 is a graph showing the composition of the synthesis gas generated in the state provided with a guide groove according to a preferred embodiment of the present invention,
10 is a horizontal cross-sectional view taken along line B-B 'of FIG. 2 showing a configuration of a second gas supply unit according to an exemplary embodiment of the present invention;
Figure 11 is a photograph showing the flow of pulverized coal particles discharged separately for each injection amount of the second auxiliary gas according to a preferred embodiment of the present invention,
12 is a cross-sectional view illustrating an operation principle in which pulverized coal injected by a guide groove and a second gas supply unit is concentrated to a plasma at a central portion according to a preferred embodiment of the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. Prior to this, terms and words used in the present specification and claims should not be construed as limited to ordinary or dictionary terms, and the inventor should appropriately interpret the concepts of the terms appropriately The present invention should be construed in accordance with the meaning and concept consistent with the technical idea of the present invention.

Therefore, the embodiments described in this specification and the configurations shown in the drawings are merely the most preferred embodiments of the present invention and do not represent all the technical ideas of the present invention. Therefore, It is to be understood that equivalents and modifications are possible.

1 is a block diagram showing the configuration of a plasma gasifier according to a preferred embodiment of the present invention. As shown, the plasma gasifier 100 according to the preferred embodiment of the present invention, the power supply unit 102, the electromagnetic wave oscillator 104, the circulator 106, the tuner 108, the waveguide 110, the discharge tube 112 , A first gas supply unit 114, a pulverized coal supply unit 116, a nozzle unit 118, a second gas supply unit 120, and a gas discharge unit 122.

First, the power supply unit 102 receives driving power from the outside to supply power for driving the plasma gasifier 100.

The electromagnetic wave oscillator 104 is connected to the power supply unit 102 and receives power from the power supply unit 102 to oscillate electromagnetic waves. In this embodiment, an electromagnetic wave oscillator (magnetron) of commercial frequency is used. For example, an electromagnetic oscillator having a frequency of 2.45 GHz or an electromagnetic oscillator for oscillating electromagnetic waves having a frequency range of 902 to 928 MHz (915 MHz magnetron) or 886 to 896 MHz (896 MHz magnetron) can be used.

The circulator 106 is connected to the electromagnetic wave oscillator 104, and outputs electromagnetic waves oscillated by the electromagnetic wave oscillator 104, and simultaneously dissipates electromagnetic energy reflected by impedance mismatch to protect the electromagnetic wave oscillator 104.

The tuner 108 adjusts the intensity of the incident wave and the reflected wave of the electromagnetic wave output from the circulator 106 to induce impedance matching so that the electric field induced by the electromagnetic wave is maximized in the discharge tube 112.

The waveguide 110 is connected between the tuner 108 and the discharge tube 112, and transmits an electromagnetic wave input from the tuner 108 to the discharge tube 112.

The power supply unit 102, the electromagnetic wave oscillator 104, the circulator 106, the tuner 108, and the waveguide 110 described above constitute the electromagnetic wave supply unit 124 in the present invention. That is, the electromagnetic wave supply unit 124 generates the electromagnetic waves of a preset frequency and supplies them to the discharge tube 112.

The discharge tube 112 generates a plasma from the electromagnetic wave and the first auxiliary gas supplied from the electromagnetic wave supply unit 120, and generates syngas by gasifying the pulverized coal using the generated plasma. The synthesis gas is mainly composed of carbon monoxide (CO) and hydrogen (H ₂ ), in addition to impurities such as sulfur compounds.

The first gas supply unit 114 injects the first auxiliary gas in a vortex form into the discharge tube 112. The first auxiliary gas may be composed of any one of oxygen, steam, or a mixed gas of oxygen and steam. As described above, the first auxiliary gas injected into the discharge tube 112 through the first gas supply unit 114 stabilizes the generated plasma by forming a swirl in the discharge tube 112 and at the same time a high temperature plasma flame. The inner wall of the discharge tube 112 is protected from.

On the other hand, it is also possible to control the composition ratio of the synthesis gas (Syn-gas) generated by controlling the mixing ratio of the steam (H ₂ O) and oxygen (O ₂ ) contained in the first auxiliary gas. For example, when pure steam (H ₂ O) is used as the first auxiliary gas, OH, H, and O are generated by plasma, and dominant species are OH and H. Therefore, when coal is gasified in a pure steam plasma, it can be predicted that the amount of hydrogen produced is greater than carbon monoxide from the reaction of coal and steam plasma.

However, when coal is gasified from a mixed gas of steam and oxygen, when the mole fraction of oxygen (Mole Fraction,%) is gradually increased from 0 to 100, the amount of oxygen atoms is increased more than the amount of hydrogen atoms generated from steam. . That is, as the mixing ratio of oxygen in the first auxiliary gas increases, the amount of carbon monoxide generated is greater than that of hydrogen. From this, the composition of the synthesis gas from coal gasification can be changed by controlling the mixing ratio of steam and oxygen.

The following reaction occurs in the discharge tube 112 by the plasma.

(1) Combustion by oxygen (oxidation reaction): C + O ₂ → CO ₂

This reaction is exothermic and occurs very quickly. This reaction can provide the heat required for gasification of coal.

(2) Gasification with oxygen (partial oxidation reaction): C + 1/2 O ₂ → CO

This reaction is also exothermic and occurs very quickly.

(3) Gasification with carbon dioxide (Boudouard reaction): C + CO ₂ → 2CO

This reaction is endothermic and slower than the oxidation reaction.

(4) Gasification by steam: C + H ₂ O ↔ CO + H ₂

Endothermic and slower than the oxidation reaction. It is the preferred reaction at high temperatures and low pressures.

(5) Gasification with Hydrogen: C + 2H ₂ ↔ CH ₄

Exothermic and slow reaction. At high pressures, however, the reaction rate is exceptionally fast.

(6) Water gas shift (WGS) reaction: Dussan reaction: CO + H ₂ O ↔ H ₂ + CO ₂

-It is rather endothermic and rapid. The H2: CO ratio of the syngas is affected by this reaction.

(7) Methane Formation Reaction: CO + 3H ₂ ↔ CH ₄

Exothermic and very slow reaction.

The pulverized coal supply unit 116 is disposed below the discharge tube 112 and supplies pulverized coal made of coal particles, which are raw materials for syngas production, to the plasma generated inside the discharge tube 112.

The nozzle unit 118 is formed on the upper portion of the discharge tube 112, so that the first auxiliary gas is changed from a vortex form to a linear movement in a direction parallel to the discharge direction of the plasma. The flow is controlled, and syngas is generated by the reaction with the plasma and pulverized coal.

The second gas supply unit 120 injects a second auxiliary gas flowing in a direction parallel to the discharge direction of the plasma along the inner wall of the nozzle unit 118. The second auxiliary gas may include one or more of steam (H ₂ O), oxygen (O ₂ ), air (Air), or carbon dioxide (CO ₂ ). Detailed configuration of the second gas supply unit 120 will be described in detail below.

The gas discharge part 122 (refer to FIG. 1) is provided at an upper end of the discharge tube 112 and discharges the syngas generated by the plasma to the outside. Syngas discharged through the gas discharge unit 122 is used to generate electric power or to produce liquefied fuel, chemical fuel, etc. through a gas purification process.

2 is a vertical cross-sectional view showing a portion where the waveguide 110 and the discharge tube 112 are connected to the plasma gasifier according to the preferred embodiment of the present invention. As shown, the discharge tube 112 is connected to the waveguide 110 to provide a space 200 in which a plasma is generated by the electromagnetic waves input through the waveguide 110.

The discharge tube 112 is formed in a cylindrical shape to guide the waveguide 110 at a point corresponding to 1/8 to 1/2 of the wavelength within the waveguide 110 from the end of the waveguide 110, preferably 1/4. It is installed to penetrate vertically, and may be made of quartz, alumina, or ceramic for easy transmission of electromagnetic waves. The discharge tube supporter 202 formed to surround the waveguide 110 on the outer surface of the waveguide 110 supports the discharge tube 112 so that the discharge tube 112 is stably inserted into the waveguide 110 and fixed.

The nozzle unit 118 is formed on the upper end of the discharge tube 112, and is formed in a cylindrical shape having the same diameter as the discharge tube (112).

The first gas supply unit 114 is formed at the lower end of the discharge tube 112, and the pulverized coal supply unit 116 is formed at the lower end of the nozzle unit 118. As shown in FIG. 3, the first gas supply unit 114 may be arranged at equal intervals, and may include one or more first gas supply pipes 300 supplying the first auxiliary gas into the discharge tube 112. .

The first gas supply pipe 300 is supplied to the discharge tube 112 so that the supplied first auxiliary gas rotates in a vortex form along the inner circumferential surface of the discharge tube 112. As shown, the first gas supply pipe 300 is connected to the inside of the discharge tube 112 such that the first auxiliary gas discharged into the discharge tube 112 is discharged along the inner circumferential surface of the discharge tube 112, that is, parallel to the inner circumferential surface. .

To this end, in the vicinity of one end where the first gas supply pipe 300 is connected to the discharge tube 112, the traveling direction of the first gas supply pipe 300 is configured to be parallel to the inner circumferential surface of the discharge tube 112. 1 The auxiliary gas is swirled while rotating in one direction along the inner wall of the discharge tube 112 in the discharge tube (112). Naturally, the rotation direction of the first auxiliary gas supplied from the first gas supply pipe 300 should be configured to be the same. Meanwhile, in the illustrated embodiment, four first gas supply pipes 300 have been shown to be arranged at equal intervals, but this is exemplary and may include an appropriate number of first gas supply pipes 300 as necessary. have.

On the other hand, Figure 4 is a horizontal cross-sectional view taken along the line AA 'of Figure 2 showing the configuration of a guide groove according to a preferred embodiment of the present invention. As shown, the nozzle unit 118 is formed in a cylindrical shape, the main cylinder 400 is configured to penetrate the plasma into the interior of the cylinder, and one or more guide grooves formed on the inner peripheral surface of the main cylinder 400 402.

Here, the main cylinder 400, the inner diameter is configured to be the same as the inner diameter of the discharge tube 112, whereby the plasma formed in the discharge tube 112 is configured to be easily discharged through the main cylinder 400. The guide grooves 402 may be arranged at equal intervals on the inner circumferential surface of the main cylinder 400 in the form of a semi-circular groove, for example. The guide groove 402 as described above changes the flow of the first auxiliary gas passing through the discharge tube 112 in a swirl flow form in a straight flow form. That is, the vortex-shaped first auxiliary gas is changed while the movement direction is guided by the guide groove 402 while passing through the nozzle unit 118 to linearly move in a direction parallel to the discharge direction of the plasma. As described above, since the guide groove 402 is arranged along the inner circumferential surface of the main cylinder 400, this gas flow change occurs most strongly at the edge of the nozzle unit 118, and toward the center of the nozzle unit 118 Weakens.

5 is a graph showing a state in which the moving speed of the first auxiliary gas for each position inside the nozzle unit is changed by the configuration of the guide groove according to the preferred embodiment of the present invention. As shown, the moving speed of the first auxiliary gas is slowed toward the center of the nozzle unit 118 by the guide groove 402 arranged along the inner circumferential surface of the main cylinder 400, and the auxiliary gas moves as it is out of the center. It will be faster. In accordance with such a speed difference, the pressure inside the nozzle unit 118 is also lowered toward the center and becomes higher as it departs from the center. Accordingly, the pulverized coal injected into the nozzle unit 118 is formed by the nozzle unit in which the plasma is formed due to the pressure difference ( 118).

On the other hand, when the inner diameter of the main cylinder 400 is R, the inner diameter of the guide groove 402 is R ', it is configured to satisfy R: R' = 1: 0.1 to 1: 1. If R 'is greater than R, the guide groove 402 may not be substantially formed on the inner wall of the main cylinder 400, and if the value of R' is less than 1/10 of R, the size of the guide groove 402 This is because is too small to sufficiently change the flow direction of the first auxiliary gas.

6 and 7 illustrate the effect of the guide groove 402 according to the preferred embodiment of the present invention, and FIG. 6 shows that the powdered coal particles are plasma by the guide groove 402 according to the preferred embodiment of the present invention. It shows a state that is discharged concentrated in the center formed, Figure 7 shows a state in which fine coal particles are radially spread and discharged in a state where the guide groove 402 is not provided. As shown, when the guide groove 402 is provided, the pulverized coal particles are concentrated in the center where plasma is formed, and when the guide groove 402 is not provided, the particles are radially spread.

8 and 9 are for explaining the effect of improving the pulverized coal gasification efficiency of the guide groove 402 according to the preferred embodiment of the present invention, Figure 8 is a synthesis gas generated in the state that the guide groove 402 is not provided 9 is a graph showing the composition of Figure 9 is a graph showing the composition of the synthesis gas generated in the state provided with a guide groove 402 according to an embodiment of the present invention. As shown, when the ratio of pulverized coal to steam is about 0.4: 1, when the guide groove 402 is not provided, the content of hydrogen is about 40% and the content of carbon dioxide is about 39%, but the guide groove 402 When it is provided that the content of hydrogen is increased to about 48% and the content of carbon dioxide can be seen to decrease to about 35%. That is, according to the present invention, gasification by plasma occurs more efficiently than in the prior art.

10 is a horizontal cross-sectional view taken along line B-B 'of FIG. 2 showing a configuration of a second gas supply unit according to an exemplary embodiment of the present invention. As shown, the nozzle unit 118 is formed in a cylindrical shape is configured to penetrate the plasma into the cylinder. The second gas supply part 120 is formed below the nozzle part 118 and injects a second auxiliary gas flowing in a direction parallel to the discharge direction of the plasma along an inner wall of the nozzle part 118. As an element, it is provided at the lower end of the nozzle unit 118, and includes a plurality of gas supply pipe for supplying a second auxiliary gas as shown.

Here, each gas supply pipe may be matched with each guide groove 402 and arranged at equal intervals. In addition, each gas supply pipe has an end 120a connected to the inner circumferential surface of the nozzle unit 118 so as to be parallel to the plasma discharge direction in the guide groove 402 so that the first along the guide groove 402. 2 Auxiliary gas is formed to be discharged. Accordingly, as indicated by the arrow of FIG. 12, the second auxiliary gas injected into the gas supply pipe is changed in the direction at the end 120a and the inner peripheral surface of the nozzle unit 118 is parallel to the discharge direction of the plasma. Along a straight line.

The flow of the second auxiliary gas occurs most strongly at the edge of the nozzle unit 118 and becomes weaker toward the center of the nozzle unit 118. That is, the moving speed of the second auxiliary gas is the fastest at the edge of the nozzle unit 118 and the slowest at the center of the nozzle unit 118. In accordance with such a speed difference, the pressure inside the nozzle unit 118 is also lowered toward the center and becomes higher as it departs from the center. Accordingly, the pulverized coal injected into the nozzle unit 118 is formed by the nozzle unit in which the plasma is formed due to the pressure difference ( 118).

In addition, when the second auxiliary gas supply amount per unit time supplied from the second gas supply unit 120 is M, and the first auxiliary gas supply amount per unit time supplied from the first gas supply unit 114 is N, M: N = 2: 1 to 4: 1. If the amount of supply of the second auxiliary gas is too small, it is impossible to form a sufficient pressure gradient to concentrate the pulverized coal.

FIG. 11 is a photograph showing the flow of pulverized coal particles discharged for each injection amount of a second auxiliary gas according to a preferred embodiment of the present invention. The flow of pulverized coal particles when the injection amount of the auxiliary gas is changed to 0lpm, 20lpm, 40lpm, 60lpm, 80lpm, and 100lpm is shown. As shown, when the injection amount of the second auxiliary gas is less than 60lpm, which is twice the supply amount of the first auxiliary gas, the pulverized coal particles are radially spread, but when the amount of the second auxiliary gas is more than 60lpm, the particles are gradually concentrated to the center.

By the above-described effects, in the case of the present invention, the injected pulverized coal is concentrated in the plasma of the center, thereby increasing the production efficiency of syngas compared to the conventional art. That is, when the guide groove 402 and the second gas supply pipe 120 having the above-described shape are not provided in the nozzle unit 118, the pulverized coal particles injected by the centrifugal force according to the first auxiliary gas having the vortex form the plasma. To get away from it. However, in the case of the present invention, as shown in Figure 12, the first auxiliary gas flows in a swirl form by the first gas supply unit 114 is guided by the guide groove 402 while the direction of movement is linear And change in a direction parallel to the discharge direction of the plasma to concentrate the pulverized coal in the plasma direction, and disposed inside the guide groove 402 to supply the second auxiliary gas in a direction parallel to the discharge direction of the plasma. The degree of concentration of the pulverized coal in the plasma direction is further increased by the second gas supply unit 120, thereby maximizing the generation efficiency of syngas.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments. It is to be understood that various modifications and changes may be made without departing from the scope of the appended claims.

102 Power supply 104 Electromagnetic wave oscillator
106.Circulator 108 ... Tuner
110 ... waveguide 112 ... discharger
1st gas supply unit 116 pulverized coal supply unit
118.Nozzle section 120.2nd gas supply section
122 ... gas discharge part 124 ... electromagnetic wave supply part
200 ... plasma generating space 202 ... discharger support
300 gas supply pipe 400 main cylinder
402 ... Guide groove

Claims (7)

An electromagnetic wave supply unit 124 for oscillating electromagnetic waves of a preset frequency;
A discharge tube 112 for generating a plasma from the electromagnetic wave and the auxiliary gas;
A first gas supply unit 114 for injecting a first auxiliary gas into a vortex form into the discharge tube 112;
Pulverized coal supply unit 116 for supplying pulverized coal to the plasma generated inside the discharge tube (112);
The first auxiliary gas is formed on the discharge tube 112, and the flow of the first auxiliary gas is controlled so that the first auxiliary gas is changed from a vortex form into a linear motion in a direction parallel to the discharge direction of the plasma. A nozzle unit 118 for generating syngas by reaction with the pulverized coal; And
And a second gas supply unit 120 for injecting a second auxiliary gas flowing in a direction parallel to the discharge direction of the plasma along the inner wall of the nozzle unit 118.
The nozzle unit 118,
A main cylinder 400 formed in a cylindrical shape and configured to penetrate the plasma into the cylinder;
Plasma gasifier characterized in that it comprises one or more guide grooves (402) formed along the extended longitudinal direction of the main cylinder (400) on the inner circumferential surface of the main cylinder (400).
The method of claim 1,
The first auxiliary gas,
Plasma gasifier characterized in that any one of oxygen, steam or a mixed gas of oxygen and steam.
The method of claim 1,
The second auxiliary gas supply amount per unit time supplied from the second gas supply unit 120 and the first auxiliary gas supply amount per unit time supplied from the first gas supply unit 114 may be between 2: 1 and 4: 1. Plasma gasifier.
delete The method of claim 1,
The guide groove (402), the plasma gasifier, characterized in that disposed on the inner circumferential surface of the main cylinder 400 at equal intervals.
The method of claim 1,
The ratio of the inner diameter (R) of the main cylinder (400) and the inner diameter (R ') of the guide groove (402) is 1: 0.1 to 1: 1, characterized in that the plasma gasifier.
The method of claim 1,
The second gas supply unit 120,
An end 120a formed below the nozzle unit 118 and connected to an inner circumferential surface of the nozzle unit 118 is formed to be parallel to the discharge direction of the plasma in the guide groove 402 to guide the guide groove. And a plurality of gas supply pipes formed to discharge the second auxiliary gas along 402.

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