KR20110012175A - Plasma gasifier for integrated gasification combined cycle - Google Patents

Abstract

PURPOSE: A plasma gasifier for integrated gasification combined cycle is provided to safely generate plasma under the atmosphere by injecting the steam and oxygen mixed gas in a waveguide with being whirlpool shape. CONSTITUTION: A plasma gasifier(600a) for integrated gasification combined cycle comprises one or more plasma generating devices(200). The plasma generating device comprises an electromagnetic wave feed port, a discharge pipe, a gas supply part, a coal supply part, a firing part, and a gas discharge part. The electromagnetic wave feed port emits the electromagnetic wave of fixed frequency. The gas supply part injects the mixed gas of the oxygen and steam into the discharge pipe in whirlpool shape.

Description

Plasma gasifier for coal gasification combined cycle {Plasma gasifier for integrated gasification combined cycle}

The present invention relates to a plasma gasifier for coal gasification combined cycle, and more particularly, to an electromagnetic plasma gasifier used for coal gasification combined cycle power generation, and generates a stable plasma by injecting a mixture of steam and oxygen in a vortex form. In addition, the present invention relates to a coal gasification combined cycle plasma gasifier capable of easily producing a syngas containing carbon monoxide and hydrogen by controlling a ratio of steam and oxygen of the mixed gas.

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

Coal gasification combined cycle power generation has the biggest advantage in that it can generate power using coal resources that are widely distributed and rich in the world. In addition, in the case of coal gasification combined cycle power generation, the thermal efficiency is high, which can reduce the generation of carbon dioxide, sulfate, nitrogen oxide, and dust per unit power generation, and it 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 excellent technology. It is also attracting attention as a pivotal technology of future power generation that can be applied to carbon dioxide separation storage technology, hydrogen production technology, and fuel cell-linked systems.

8 is a view showing a conceptual diagram of such coal gas combined cycle power generation. As shown, the coal gasification combined cycle system first burns coal to generate syngas, and the generated syngas is injected into a gas turbine to produce electric power. Power can also be produced once more by turning the steam turbine with the heat of the exhaust gas emitted from the gas turbine. In addition, the syngas is not only used for power generation, but also liquefied fuel such as diesel, gasoline, DME, etc., chemical raw materials such as methanol and ethylene can be produced using coal liquefaction technology, and hydrogen can also be produced from syngas. have.

Thus, in the case of coal gas combined cycle power generation, there is an advantage in terms of efficiency and environmental pollution as well as in combination with various fields. However, conventional coal gasification combined cycle has the following problems.

First, in the conventional coal gasification combined cycle power generation, the coal is gasified by radiant heat of a high temperature furnace in the gasification process of coal, and thus preheating of 1300 to 1500 degrees Celsius is required for the operation of the gasifier. Therefore, it takes a lot of time and money for the preheating of the gasifier.

In addition, since the conventional coal gasification combined cycle power generation requires a high pressure of 25 atm or more for gasification, miniaturization of the gasifier itself is very difficult, and control of the gasifier is also difficult.

SUMMARY OF THE INVENTION An object of the present invention is to produce a stable plasma at a pressure of 1 atm by mixing a mixture of steam and oxygen in an eddy form in an electromagnetic plasma gasifier used in coal gasification combined cycle power generation. The present invention provides a plasma gasifier for coal gasification / complexation that can control the ratio of carbon monoxide and hydrogen in a syngas containing carbon monoxide and hydrogen.

Plasma gasifier used in coal gasification combined cycle power generation according to an embodiment of the present invention for achieving the above object includes at least one plasma generating device, the plasma generating device is an electromagnetic wave supply unit for generating an electromagnetic wave of a predetermined frequency, A discharge tube in which a plasma is generated from the electromagnetic wave supplied from the electromagnetic wave supply unit, and a mixed gas of steam and oxygen, a gas supply unit injecting a mixed gas of steam and oxygen into the discharge tube in a vortex form, and a solid in the plasma generated inside the discharge tube A coal supply unit for supplying coal in the form, an ignition unit for supplying initial electrons for plasma generation inside the discharge tube, and a gas discharge unit for discharging the synthesis gas synthesized from the reaction of plasma and coal generated in the discharge tube. .

At this time, the electromagnetic wave oscillated by the electromagnetic wave supply unit may be configured to have a frequency range of 902 ~ 928MHz or 886 ~ 896MHz.

The gas supply unit may include one or more steam supply pipes formed at a lower end portion of the discharge tube and having one end connected to the inside of the discharge tube to supply steam into the discharge tube; And one or more oxygen supply pipes whose one end is connected to the inside of the discharge tube to supply oxygen into the discharge tube.

In this case, the gas supply unit may include the same number of the steam supply pipe and the oxygen supply pipe, the one or more steam supply pipe and the one or more oxygen supply pipe, may be arranged at the same interval inside the gas supply.

The one or more steam supply pipes and the one or more oxygen supply pipes may be alternately arranged in the gas supply part.

The one or more steam supply pipes and the one or more oxygen supply pipes are connected to the inside of the discharge tube so that the steam and oxygen discharged into the discharge tube are discharged in parallel with the inner circumferential surface of the discharge tube, thereby ejecting the steam into the discharge tube. And oxygen may be mixed with each other to form a vortex.

On the other hand, the coal supply unit is formed in a form surrounding the discharge tube on the upper end of the gas supply unit, one end is connected to the interior of the discharge tube to supply one or more coal supply pipe to supply the coal in the form of solid in the plasma generated inside the discharge tube It may include.

In this case, the one or more coal supply pipes may be arranged at equal intervals inside the coal supply unit.

In addition, the at least one coal supply pipe is configured such that one end connected to the inside of the discharge pipe is directed toward the center of the plasma formed inside the discharge pipe, so that coal supplied through the coal supply pipe is ejected toward the center of the plasma. The coal discharged into the discharge tube may be configured to form a vortex by being connected to the inside of the discharge tube such that the coal discharged into the discharge tube is discharged in parallel with the inner circumferential surface of the discharge tube.

In this case, the one or more coal supply pipes may be disposed inside the coal supply unit such that the ejected coal forms a vortex in the same direction as the mixed gas of steam and oxygen supplied from the gas supply unit.

The coal supply unit may supply the coal into the discharge tube by mixing the coal with at least one gas of steam, oxygen, a mixed gas of steam and oxygen, or carbon dioxide.

The present invention has the advantage of generating a plasma stably at 1 atm by injecting a mixture of steam and oxygen in a vortex form into the waveguide.

In addition, by controlling the ratio of steam and oxygen of the mixed gas there is an advantage that can produce a synthesis gas of the desired form by controlling the ratio of carbon monoxide and hydrogen of the syngas (Syn-gas) containing carbon monoxide and hydrogen.

Hereinafter, a specific embodiment of the coal gasification combined cycle plasma gasifier according to the present invention will be described with reference to FIGS. 1 to 7B. However, this is only an example and the present invention is not limited thereto.

In describing the present invention, when it is determined that the detailed description of the known technology related to the present invention may unnecessarily obscure the subject matter of the present invention, the detailed description thereof will be omitted. The following terms are defined in consideration of the functions of the present invention, and may be changed according to the intention or custom of the user, the operator, and the like. Therefore, the definition should be based on the contents throughout this specification.

The technical spirit of the present invention is determined by the claims, and the following embodiments are merely one means for efficiently explaining the technical spirit of the present invention to those skilled in the art to which the present invention pertains.

1 is a block diagram showing the configuration of a coal gas combined cycle power generation system 100 according to an embodiment of the present invention.

As illustrated, in the coal gasification combined cycle system 100, coal is first combusted in the gasifier 102 to generate syngas. The syngas has hydrogen and carbon monoxide as main components and contains some impurities such as sulfur compounds. The generated syngas is purified through a gas purification process 104 to remove impurities such as sulfur compounds and dust, and to purify the syngas containing pure hydrogen and carbon monoxide only. Slag generated in the synthesis gas generation process is used as a building material, etc. The sulfur compound separated in the refining process may be recycled in a chemical plant.

The syngas generated and purified from coal is injected into the gas turbine 106 to produce electric power by turning the gas turbine 106. In addition, by collecting the heat of the exhaust gas emitted from the gas turbine 106 to generate steam in the steam generator 108 to turn the steam turbine 110 to produce power once again. If the power is produced through this process, the thermal efficiency of the existing coal-fired power plant currently in the 30% range can be increased to 40%, and the amount of carbon dioxide and sulfur compounds generated in the power generation process can be drastically lowered.

In addition, hydrogen may be produced by separating the syngas from the gas separator 112, and converting the syngas using coal liquefaction technology 114 to liquefied fuel such as diesel, gasoline, DME, methanol, ethylene, etc. Raw materials can also be produced.

2 is a block diagram of the plasma generator 200 included in the coal gasification combined cycle plasma gasifier according to an embodiment of the present invention.

As shown, the plasma generator 200 includes a power supply unit 202, an electromagnetic wave oscillator 204, a circulator 206, a tuner 208, a waveguide 210, a discharge tube 212, a gas supply unit 214, and coal. And a supply unit 216, an ignition unit 218, and a gas discharge unit 220.

The power supply unit 202 supplies power required for driving the plasma generator 200.

The electromagnetic wave oscillator 204 is connected to the power supply unit 202 and receives power from the power supply unit 202 to oscillate electromagnetic waves. In the present invention, an electromagnetic oscillator for oscillating an electromagnetic wave having a frequency range of 902 to 928 MHz or 886 to 896 MHz is used. Preferably, the electromagnetic wave having the frequency of 915 MHz or 896 MHz is oscillated using the electromagnetic wave oscillator 204.

The circulator 206 is connected to the electromagnetic wave oscillator 204 and protects the electromagnetic wave oscillator 204 by dissipating electromagnetic energy reflected by impedance mismatch while outputting electromagnetic waves oscillated from the electromagnetic wave oscillator 204.

The tuner 208 adjusts the intensity of the incident wave and the reflected wave of the electromagnetic wave output from the circulator 204 to induce impedance matching so that the electric field induced by the electromagnetic wave is maximized in the discharge tube 212.

The waveguide 210 transmits the electromagnetic wave input from the tuner 208 to the discharge tube 212. In the present invention, the size of the waveguide 210 is related to the frequency of the electromagnetic wave oscillated by the electromagnetic wave oscillator 204. As the frequency of the electromagnetic wave oscillated by the electromagnetic wave oscillator 204 decreases, the wavelength becomes longer. Therefore, when electromagnetic waves having different frequencies are introduced into a waveguide of a predetermined size, electromagnetic waves of frequencies lower than the inherent cutoff frequency do not flow into the waveguide. . In other words, the waveguide acts as a kind of high pass filter, and thus the waveguide is sized according to the frequency used.

The inherent cutoff frequency of the waveguide is determined by Equation 1 below.

In the above equation, f _c is the cutoff frequency, c is the speed of light, a is the width of the waveguide, b is the length of the waveguide, and m and n are the electromagnetic wave mode numbers in the waveguide.

In the present invention, the waveguide having the size of the width (a) * length (b) is 25cm * 12.5cm. In the present invention, since the electromagnetic wave is oscillated in the TE ₁₀ mode, the m value is 1 and the n value is 0. When the cutoff frequency of the waveguide 210 in the present invention is calculated, the following equation (2) is obtained.

As described above, since the electromagnetic wave oscillator 204 of the present invention oscillates electromagnetic waves having a frequency range of 902 to 928 MHz or 886 to 896 MHz, the electromagnetic wave oscillated by the electromagnetic wave oscillator 204 is higher than the cutoff frequency of the waveguide 210. It can be seen that it is introduced into the waveguide 210 without being blocked.

On the other hand, the cutoff wavelength in the waveguide 210 is obtained as shown in Equation 3 below.

If the oscillation frequency in the electromagnetic wave oscillator 204 is 915 MHz, the wavelength λ _{g in} the waveguide is expressed by Equation 4 below.

When the discharge tube 212 is inserted at a position 1/4 away from the end of the waveguide 210 at the wavelength λ _g of the tube, the wavelength at the position where the discharge tube is inserted is about 11 cm (# 43.5 / 4).

As shown, the power supply unit 202, the electromagnetic wave oscillator 204, the circulator 206, the tuner 208, and the waveguide 210 constitute the electromagnetic wave supply unit 222 in the present invention, the electromagnetic wave supply unit 222 ) Generates electromagnetic waves and supplies them to the discharge tube 212.

The discharge tube 212 generates a plasma from the mixed gas of the electromagnetic wave, steam, and oxygen supplied from the electromagnetic wave supply unit 222, and uses the generated plasma to gasify the coal in solid form to synthesize syn-gas. Create The synthesis gas is mainly composed of carbon monoxide (CO) and hydrogen (H ₂ ), in addition to impurities such as sulfur compounds.

As described above, the mixed gas of steam and oxygen injected into the discharge tube 212 stabilizes the generated plasma and forms a swirl in the discharge tube 212 to protect the inner wall of the discharge tube 212 from a high temperature plasma flame. do. In general, it is very difficult to generate plasma using pure steam only at atmospheric pressure, and there is a problem that the plasma is easily turned off even when generated. However, in the present invention, by using a mixed gas of steam and oxygen, much more than using pure steam. The plasma can be generated stably.

In addition, it is also possible to control the composition ratio of the synthesis gas (Syn-gas) generated by controlling the mixing ratio of the mixed gas of the steam (H ₂ O) and oxygen (O ₂ ). 3 is an optical emission spectrum obtained from an electromagnetic plasma torch using pure steam (H ₂ O) only. As shown, pure steam (H ₂ O) plasma produces OH, H, O, and the 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 mixture gas of steam and oxygen, if the mole fraction (%) of oxygen is gradually increased from 0 to 100, the oxygen atoms of 777 nm and 844.5 nm are generated from steam in the drawing. It is ahead of the amount of hydrogen atoms. Therefore, as the mixing ratio of oxygen increases, the amount of carbon monoxide generated is greater than that of hydrogen, and thereby 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 212 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 H ₂ : CO ratio of syngas is affected by this reaction.

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

Exothermic and very slow reaction.

Next, the gas supply unit 214 injects a mixed gas of steam and oxygen into the discharge tube 212 in a vortex form, and the coal supply unit 216 forms solid coal (pulverized coal) in the plasma generated inside the discharge tube 212. To supply. Detailed configurations of the gas supply unit 214 and the coal supply unit 216 will be described later.

The ignition unit 218 includes a pair of electrodes installed inside the discharge tube 212 and supplies initial electrons for generating plasma through the electrodes.

The gas discharge part 220 is provided at an upper end of the discharge tube 212 and discharges the syngas generated by the plasma to the outside. Syngas discharged through the gas discharge unit 220 is used to generate electric power or to produce liquefied fuel, chemical fuel, etc. through a gas purification process.

4 is a vertical cross-sectional view showing a portion where the waveguide 210 and the discharge tube 212 of the plasma generating apparatus 200 according to an embodiment of the present invention are connected.

As shown, the discharge tube 212 is connected to the waveguide 210 to provide a space in which the plasma is generated by the electromagnetic wave input through the waveguide 210. The discharge tube 212 is formed in a cylindrical shape to vertically guide the waveguide 210 at a point corresponding to 1/8 to 1/2 of the wavelength in the waveguide 210, preferably 1/4, from the end of the waveguide 210. It may be installed to penetrate, and may be made of quartz, alumina, or ceramic for easy transmission of electromagnetic waves. The discharge tube holder 300 formed under the waveguide 210 supports the discharge tube 212 so that the discharge tube 212 is stably inserted into the waveguide 210 and fixed.

The gas supply unit 214 is formed to surround the discharge tube 212 at the lower end of the discharge tube 212, and the coal supply unit 216 is an upper end of the gas supply unit 214, that is, the portion where the plasma is formed in the discharge tube 212. It is formed in a wrapping form.

5A to 5C are horizontal cross-sectional views showing the detailed configuration of the gas supply unit 214 of the plasma generating apparatus 200 according to an embodiment of the present invention.

As shown, the gas supply unit 214 of the plasma generating apparatus 200 according to an embodiment of the present invention includes one or more steam supply pipe 400 and one or more oxygen supply pipe 402. Each of the steam supply pipe 400 and the oxygen supply pipe 402 is configured to supply steam and oxygen to one end of the steam supply pipe 400 and the inside of the discharge pipe 212. Steam and oxygen supplied to each of the steam supply pipe 400 and the oxygen supply pipe 402 are mixed in the discharge tube 212 to form a mixed gas of steam and oxygen.

The steam supply pipe 400 and the oxygen supply pipe 402 may be formed in an appropriate number inside the gas supply unit 214 as necessary. 5A illustrates an embodiment in which one steam supply pipe 400 and one oxygen supply pipe 402 are formed, respectively, and FIGS. 5B and 5C illustrate embodiments in which two or three steam supply pipes 400 and oxygen supply pipes 402 are provided, respectively. It is shown. As shown, the steam supply pipe 400 and the oxygen supply pipe 402 may be formed in the gas supply unit 214 in the same number, respectively. That is, when two steam supply pipes 400 are formed, two oxygen supply pipes 402 may also be formed. In addition, the steam supply pipe 400 and the oxygen supply pipe 402 may be arranged at equal intervals around the discharge pipe 212 in the gas supply unit 214, as shown in the steam supply pipe 400 and the oxygen supply pipe 402 Alternately (ie, in the order of the steam supply pipe 400, the oxygen even pipe 402, the steam supply pipe 400, the oxygen supply pipe 402...) In the gas supply part 214.

The steam supply pipe 400 and the oxygen supply pipe 402 are supplied to the discharge tube 212 so that the mixed gas of the supplied steam and oxygen rotates in a vortex form along the inner circumferential surface of the discharge tube 212. To this end, as illustrated, the steam supply pipe 400 and the oxygen supply pipe 402 may discharge steam and oxygen discharged into the discharge tube 212 along the inner circumferential surface of the discharge tube 212 (that is, parallel to the inner circumferential surface). Is connected to the inside of 212. To this end, the steam supply pipe 400 and the oxygen supply pipe 402 is configured so that the advancing direction of the steam supply pipe 400 and the oxygen supply pipe 402 is parallel to the inner peripheral surface of the discharge pipe 212 near one end connected to the discharge tube 212. Should be. In this case, the supplied steam and oxygen are mixed with each other in the discharge tube 212 and rotate in one direction to form a vortex. Naturally, the directions of rotation of steam and oxygen supplied from the steam supply pipe 400 and the oxygen supply pipe 402 should be the same.

6A and 6B are horizontal cross-sectional views showing the detailed configuration of the coal supply unit 216 of the plasma generating apparatus 200 according to an embodiment of the present invention.

As shown, the coal supply unit 216 of the plasma generating apparatus 200 according to an embodiment of the present invention includes one or more coal supply pipes 500, and inside the discharge pipe 212 through the coal supply pipe 500. Powdered coal (pulverized coal) is supplied to the formed plasma.

The coal supply pipe 500 may also be formed in an appropriate number inside the coal supply unit 216 as necessary. Like the steam supply pipe 400 and the oxygen supply pipe 402, the coal supply pipe 500 may also be provided in the coal supply unit 216. In the discharge tube 212 may be arranged at equal intervals.

In one embodiment, the coal supply pipe 500 may be supplied to the discharge tube 212 so that the supplied powdered coal rotates in a vortex form along the inner circumferential surface of the discharge tube 212. To this end, as shown in FIG. 6A, the coal supply pipe 500 includes the discharge pipe 212 so that coal discharged into the discharge pipe 212 is discharged along the inner circumferential surface of the discharge pipe 212 (that is, parallel to the inner circumferential surface). It is connected to the inside. To this end, similarly to the steam supply pipe 400 and the oxygen supply pipe 402, the coal supply pipe 500 also has a traveling direction of the coal supply pipe 500 parallel to the inner circumferential surface of the discharge pipe 212 near one end connected to the discharge pipe 212. It must be constructed. In this case, the supplied coal rotates in one direction in the discharge tube 212 to have a vortex shape. At this time, the rotation direction of the vortex preferably corresponds to the rotation direction of the mixed gas of steam and oxygen.

In another embodiment illustrated in FIG. 6B, the coal supply pipe 500 may be formed to face the center of the plasma formed inside the discharge pipe 212. In this case, the pulverized coal ejected through the coal supply pipe 500 is directly injected toward the center of the plasma having a high temperature, so that partial combustion and gasification of coal may occur more easily.

Carbon dioxide (CO ₂ ) may be used as a carrier gas for supplying coal (pulverized coal) into the discharge tube 212. Synthesis gas generated in the plasma generating apparatus 200 according to the present invention includes a significant amount of carbon dioxide in addition to hydrogen (H ₂ ) and carbon monoxide. Therefore, when the carbon dioxide is separated from the synthesis gas and recycled as a carrier gas for transporting the coal, the coal can be effectively transferred to the plasma in the discharge tube 212 and at the same time, it is also possible to prevent environmental pollution due to the emission of carbon dioxide into the air. There is. In addition, as the carrier gas, a mixed gas of oxygen and steam may be used in the same manner as the gas supply unit 214, and pure steam or oxygen may also be used as the carrier gas.

FIG. 7A is a diagram illustrating an embodiment of a coal gasification / complexing plasma gasifier 600a including a plurality of plasma generators 200 as described above. As shown, the plasma gasifier 600a according to the present embodiment includes a plurality of plasma generators 200 around the cylindrical body 602a, and each plasma generator 200 includes a gas discharge unit ( 220 is coupled to the body 602a to be connected to the interior of the body 602a. Therefore, the synthesis gas generated from each plasma generator 200 is collected at the synthesis gas outlet 604a at the top of the body 602a, and the by-products generated in this process are discharged to the by-product discharge port 606a at the bottom.

FIG. 7B is a view showing another embodiment of the coal gasification combined cycle plasma gasifier 600b including a plurality of plasma generating apparatuses 200 as described above. As shown in FIG. 7A, the plasma gasifier 600b according to the present embodiment also includes a cylindrical body 602b, a syngas outlet 604b, and a by-product outlet 606a, and the plasma generator 200 includes the body 602b. All configurations are the same as the plasma gasifier 600a shown in FIG. 7A except that it is located at the top, not the bottom.

Although the present invention has been described in detail with reference to exemplary embodiments above, those skilled in the art to which the present invention pertains can make various modifications to the above-described embodiments without departing from the scope of the present invention. Will understand.

Therefore, the scope of the present invention should not be limited to the described embodiments, but should be defined by the claims below and equivalents thereof.

1 is a block diagram showing the configuration of a coal gas combined cycle power system according to an embodiment of the present invention.

2 is a block diagram of a plasma generator 200 used in a coal gasification combined cycle plasma gasifier according to an embodiment of the present invention.

3 is an optical emission spectrum obtained from an electromagnetic plasma torch using pure steam (H ₂ O) only.

4 is a vertical cross-sectional view showing a portion where the waveguide 210 and the discharge tube 212 of the plasma generating apparatus 200 according to an embodiment of the present invention are connected.

5A to 5C are horizontal cross-sectional views showing the detailed configuration of the gas supply unit 214 of the plasma generating apparatus 200 according to an embodiment of the present invention.

6A and 6B are horizontal cross-sectional views showing the detailed configuration of the coal supply unit 216 of the plasma generating apparatus 200 according to an embodiment of the present invention.

FIG. 7A is a diagram illustrating an embodiment of a plasma gasifier 600a for coal gasification combined cycle including a plurality of plasma generators 200.

FIG. 7B is a view showing another embodiment of the plasma gasifier 600b for coal gasification combined cycle including a plurality of plasma generators 200.

8 is a conceptual diagram of a coal gas combined cycle power generation system.

Claims (13)

As a plasma gasifier used in coal gasification combined cycle power generation, The plasma gasifier includes one or more plasma generators, The plasma generator, An electromagnetic wave supply unit for oscillating electromagnetic waves of a predetermined frequency; A discharge tube generating plasma from the electromagnetic wave supplied from the electromagnetic wave supply unit, and a mixed gas of steam and oxygen; A gas supply unit for injecting a mixed gas of steam and oxygen into the discharge tube in a vortex form; A coal supply unit supplying coal in solid form to the plasma generated inside the discharge tube; An ignition unit supplying initial electrons for generating plasma to the discharge tube; And A gas discharge part for discharging the synthesized synthesis gas from the reaction of the plasma generated in the discharge tube with coal; Plasma gasifier comprising a. The method of claim 1, The electromagnetic wave oscillated by the electromagnetic wave supply unit is configured to have a frequency range of 902 ~ 928MHz or 886 ~ 896MHz, plasma gasifier. The method of claim 1, The gas supply unit is formed in a form surrounding the discharge tube at the lower end of the discharge tube, One or more steam supply pipes whose one end is connected to the inside of the discharge pipe to supply steam into the discharge pipe; And One or more oxygen supply pipes whose one end is connected to the inside of the discharge pipe to supply oxygen into the discharge pipe; Plasma gasifier comprising a. The method of claim 3, The gas supply unit includes the same number of the steam supply pipe and the oxygen supply pipe, the plasma gasifier. The method of claim 3, The at least one steam supply pipe and the at least one oxygen supply pipe are disposed within the gas supply unit at equal intervals, the plasma gasifier. The method of claim 3, And the at least one steam supply pipe and the at least one oxygen supply pipe are alternately arranged within the gas supply. The method of claim 3, The one or more steam supply pipes and the one or more oxygen supply pipes are connected to the inside of the discharge tube so that the steam and oxygen discharged into the discharge tube are discharged in parallel with the inner circumferential surface of the discharge tube, thereby the steam spouted into the discharge tube and Wherein the oxygen is configured to mix with each other to form a vortex. The method of claim 1, The coal supply unit is formed in a form surrounding the discharge tube on the top of the gas supply unit, And at least one coal supply pipe, one end of which is connected to the inside of the discharge tube and supplies coal in solid form to the plasma generated inside the discharge tube. The method of claim 8, The one or more coal supply pipe, the plasma gasifier is arranged at equal intervals inside the coal supply. The method of claim 8, The at least one coal supply pipe is configured such that one end connected to the inside of the discharge pipe is directed toward the center of the plasma formed inside the discharge pipe, so that coal supplied through the coal supply pipe is ejected toward the center of the plasma. Plasma gasifier. The method of claim 8, The at least one coal supply pipe is connected to the inside of the discharge tube such that the coal discharged into the discharge tube is discharged in parallel with the inner circumferential surface of the discharge tube, so that the coal ejected into the discharge tube forms a vortex. Gasifier. The method of claim 11, Wherein said at least one coal supply pipe is disposed inside said coal supply such that ejected coal forms a vortex in the same direction as the mixed gas of steam and oxygen supplied from said gas supply. The method according to claim 1 or 8, The coal supply unit is a plasma gasifier for supplying the coal into the discharge vessel by mixing the coal with at least one of steam, oxygen, a mixed gas of steam and oxygen or carbon dioxide.

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