KR20120103018A - H2s removal apparatus and method using microwave plasma - Google Patents

Abstract

PURPOSE: An apparatus and a method for eliminating hydrogen sulfide are provided to generate combustible gas from hydrogen sulfide and to prevent the corrosion of an apparatus for eliminating hydrogen sulfide. CONSTITUTION: A method for eliminating hydrogen sulfide includes the following: mixed gas of plasma generating gas and syngas containing hydrogen sulfide is introduced into a hydrogen sulfide supplying chamber to be circulated; microwaves generated from a plasma generating unit is supplied to the mixed gas; the molecules of the plasma generating gas is dissociated based on the electric field of the microwaves; plasma flame is generated based on plasma discharging; the syngas containing hydrogen sulfide passes through the plasma flame to decompose the hydrogen sulfide into sulfur atoms and hydrogen atoms; the decomposed hydrogen atoms are re-combined to generate hydrogen gas as combustible gas; the sulfur atoms are coagulated to be solidified; and the hydrogen gas and the solidified sulfur are separated by a cyclone and are respectively collected. [Reference numerals] (AA) Introducing mixed gas containing hydrogen sulfide; (BB) Applying microwaves; (CC) Forming plasma flame; (DD) Decomposing hydrogen sulfide; (EE) Recombination; (FF) Separately collecting hydrogen gas and solid sulfur

Description

H2S Removal Apparatus and Method using Microwave Plasma}

The present invention relates to an apparatus and method for removing hydrogen sulfide using a microwave plasma, and more specifically, hydrogen sulfide (H ₂ S), which is a toxic gas contained in natural gas, crude oil refinery gas, and gasification synthesis gas, may be prepared using a microwave plasma. And to generate elemental sulfur and hydrogen therefrom.

Particularly, the synthesis gas produced through the synthesis gas production process in which the sulfur-containing hydrocarbon material is partially oxidized by steam and oxygen mixing in a reducing atmosphere contains a large amount of hydrogen sulfide. By decomposing the gas into elemental sulfur (S) and hydrogen (H ₂ ) and separating and decomposing the decomposed elemental sulfur and hydrogen into cyclones, the process for receiving additional flammable gas and elemental sulfur can be simplified to improve process efficiency and economic efficiency. The present invention relates to an apparatus and a method for removing hydrogen sulfide using a microwave plasma.

Plasma refers to an ionizing gas in which an atomic nucleus and an electron, called a fourth state of matter, are separated. The formation of the plasma, together with its generation, forms large amounts of radicals that can activate chemical reactions. Plasma can be classified into low temperature plasma and high temperature plasma. Low temperature plasma is used in fields requiring chemical reaction at a low temperature of 100 ° C. or lower, and in the case of high temperature plasma, a temperature of 5000 ° C. or higher can be raised in a short time, and thus it can be applied to fields such as incineration and melting requiring high temperature. Recently, high temperature plasma technology has been applied to various gasification technologies for simple incineration, process efficiency and combustion gas utilization. As the most widely used plasma method to date, a torch using an arc discharge has been applied. However, the limit of electrode life due to the high temperature generated during discharge and high electric current are required. Injecting the steam required to reduce the life of the electrode. Therefore, research on high temperature plasma application technology using microwaves has been actively conducted.

In addition, gasification refers to a process of converting a hydrocarbon-based material into a combustible mixed gas form such as hydrogen, carbon monoxide, and methane by reacting with a gasifying agent such as water vapor, oxygen, hydrogen, and carbon dioxide. At this time, impurities such as hydrogen sulfide, ammonia, ash, unreacted soot, and tar are generated in addition to the combustible mixed gas and are present together in the combustible mixed gas. Syngas containing hydrogen and carbon monoxide can be applied to combined cycle power generation through fuel cells, gas engines and steam turbines, liquid fuel production and chemical production. The impurities mentioned above must be removed. In particular, in the case of gasification reaction, the main component of the sulfur compound in the synthesis gas is hydrogen sulfide because it is made in a reducing atmosphere. These hydrogen sulfides are not only corrosive to the device but also very harmful to the human body and should be removed before acting on gas engines or venting to the atmosphere.

In the case of the existing syngas desulfurization system, a wet refining method for absorbing and removing sulfur compounds by using an absorbing liquid at low temperature has been put to practical use. The basic acid gas removal system is composed of a hydrogen sulfide absorption tower and a hydrogen sulfide regeneration tower. Hydrogen sulphide is removed from the syngas with an absorbent and hydrogen sulphide removed from the absorption tower is stripped in a regeneration tower and sent to the Claus process where it is converted to elemental sulfur. The converted elemental sulfur is sold as a high value added substance used in the manufacture of sulfuric acid, pharmaceuticals, cosmetics, fertilizers and rubber raw materials.

In the case of producing electric power using syngas, in terms of efficiency, supplying and combusting a gas engine at a high gas temperature can bring about high power generation efficiency. Therefore, it is preferable to use the syngas generated in the gasification reactor to generate hydrogen sulfide under high temperature as possible for power generation.

However, in the case of the existing commercial gas desulfurization technology, the absorption process is performed at a lower temperature of 50 ° C. or lower, so that the synthesis gas is supplied at a relatively low temperature, and thus, the generation efficiency is low. It has to go through three stages of Claus process for production, and it has a disadvantage of high process cost and energy consumption because it needs to replenish absorbent periodically. In addition, the sulfur absorbent and the synthesis gas is in contact with some of the sorbent scattered in the synthesis gas is introduced into the gas engine may cause gas engine corrosion and air pollution.

Therefore, there is a need for a new method for simplifying the process to improve the economics as well as increase the removal efficiency of hydrogen sulfide gas.

The hydrogen sulfide removal device and method using the microwave plasma of the present invention,

Hydrogen sulfide is decomposed into elemental sulfur (S) and hydrogen (H ₂ ) by contacting a synthesis gas containing hydrogen sulfide produced during gasification with an atmospheric pressure plasma, and the elemental sulfur and hydrogen are separated by a cyclone or gravity separator. In addition, the present invention aims to provide a device that can reduce facility costs and improve process efficiency by simplifying the process such as receiving flammable gas and high value elemental sulfur.

Hydrogen sulfide removal device using the microwave plasma of the present invention for solving the above problems,

In a hydrogen sulfide removal device that receives a synthesis gas generated from gasification of hydrocarbon fuel and decomposes and removes hydrogen sulfide contained in the synthesis gas under a high-temperature microwave plasma flame, a hydrogen sulfide-containing synthesis gas and a plasma generating gas are supplied. A hydrogen sulfide supply chamber which is a straight pipe; The microwave generated by the waveguide, which is a horizontal tube communicating with the hydrogen sulfide supply chamber, is moved to the portion communicating with the hydrogen sulfide supply chamber, and the electric field by microwave high density aggregation is raised to dissociate the supplied plasma generating gas. A plasma generator for forming a plasma flame by plasma discharge; A plasma decomposition chamber communicating with a lower end surface of the plasma generator waveguide, connected to the same axis as the hydrogen sulfide supply chamber, and having a plasma flame positioned therein, the supplied hydrogen sulfide being introduced into the plasma flame to decompose; A recombination chamber coupled in communication with a lower end of the plasma decomposition chamber, the recombination chamber being a vertical tube which recombines hydrogen in the hydrogen sulfide element decomposed into a plasma flame to separate sulfur from sulfur; A cyclone installed at a lower end of the recombination chamber to separate the synthesis gas and solid sulfur which are combustible gases; And a synthesis gas capture tank and a sulfur capture tank for collecting the synthesis gas and solid sulfur separated by the cyclone, respectively.

In addition, the hydrogen sulfide removal method using the apparatus according to the present invention,

A mixed gas supplying step including hydrogen sulfide for supplying a mixed gas including a plasma generation gas and a synthesis gas including hydrogen sulfide to be turned into a hydrogen sulfide supply chamber; A microwave supplying step of supplying microwaves generated by the plasma generator to the supplied mixed gas; A plasma flame forming step of dissociating molecules of the plasma generating gas in the mixed gas by an electric field of the supplied microwave to form a plasma flame by plasma discharge; A hydrogen sulfide decomposition step of decomposing hydrogen sulfide into elemental units of sulfur and hydrogen by passing a synthesis gas containing hydrogen sulfide through the plasma flame; A recombination step of recombining the decomposed hydrogen into a hydrogen gas which is a combustible gas, and sulfur condensing in a solid state; And separating and collecting the hydrogen gas and the solid sulfur through a cyclone and collecting each of them separately.

Hydrogen sulfide removal device and method using the microwave plasma of the present invention as described in detail above,

By passing the synthesis gas containing hydrogen sulfide gas without oxygen into the high temperature plasma region of 3000 ℃ or higher, hydrogen sulfide is decomposed atomically without the disappearance of flammable hydrogen, carbon monoxide and methane in the synthesis gas, and the bonding is performed first between hydrogens having strong bonding force in recombination. By generating hydrogen gas, it is separated into hydrogen gas and elemental sulfur. This can be separated and received by using a cyclone or a gravity dust collector at the rear of the reaction section, which can simplify the entire system and reduce the equipment cost, and prevent the corrosion of the device because hydrogen sulfide is not included in the combustible gas, and additional combustible gas from hydrogen sulfide It is effective to reduce the maintenance costs by generating and receiving high value elemental sulfur.

1 is a block diagram of a hydrogen sulfide removal device using a microwave plasma according to the present invention.
Figure 2 is a schematic diagram showing a combined state of the hydrogen sulfide supply chamber and the mixed gas supply pipe according to the present invention.
Figure 3 is a state diagram of the microwave plasma in the hydrogen sulfide removal apparatus according to the present invention.
Figure 4 is a block diagram showing a process for removing hydrogen sulfide of the present invention.
5 is a photograph showing a state of capture of solid sulfur according to an embodiment of the present invention.

Hereinafter, the present invention will be described in detail with the accompanying drawings.

1 is a block diagram showing a microwave plasma gasifier according to the present invention, Figure 2 is a schematic diagram showing a coupling state of the hydrogen sulfide supply chamber and the mixed gas supply pipe according to the present invention, Figure 3 is a micro It is a state diagram of a wave plasma gasifier.

As described above, the hydrogen sulfide removal device 1 using the microwave plasma of the present invention includes a hydrogen sulfide supply chamber 10, a plasma decomposition chamber 30, and a recombination chamber 40 installed on the same vertical axis.

The hydrogen sulfide supply chamber 10 is supplied with a plasma generating gas and an igniter 13 is installed at one side to ignite the supplied gas so that a flame is generated. The supplied plasma generating gas includes nitrogen and argon. Each gas supply line may include a filter for removing foreign substances in the gas, a flow controller for adjusting the amount of gas supplied thereto, and a valve for controlling the gas supply line. have.

The plasma generating gas supplied to the hydrogen sulfide supply chamber 10 may be supplied as one kind or mixed with a plurality of gases, and may be supplied as the plasma generating gas alone or as shown in the drawing. After mixing with the synthesis gas containing may be to be supplied through the mixed gas supply pipe 12 mixed gas.

In this case, the mixed gas supply pipe 12 communicating with the hydrogen sulfide supply chamber 10 may be supplied through one pipe or may be installed at equal intervals along the periphery of the hydrogen sulfide supply chamber.

In addition, the mixed gas supply pipe 12 is spaced apart laterally from the center of the axis of the hydrogen sulfide supply chamber 10, as shown in Figure 2, is installed to face the downward direction of the hydrogen sulfide supply chamber 10 as shown in FIG. The mixed gas is moved to a swirling air stream that rotates at an inner surface of the hydrogen sulfide supply chamber at high speed. That is, the mixed gas to be supplied hits the inner wall of the hydrogen sulfide supply chamber 10 vertically, thereby minimizing the decrease in the flow rate, so that the gas is supplied at a high speed. As such, when the gas flow rate is formed at a high speed, the formation length of the plasma flame 24 generated in the later process is increased to increase the time for the hydrogen sulfide contained in the synthesis gas to come into contact with the high temperature plasma, thereby easily dissociating in atomic units. (Decompose).

The supplied plasma generating gas is supplied to the plasma decomposition chamber 30 through the waveguide 22 of the plasma generating apparatus 20 while turning the hydrogen sulfide supply chamber 10.

The plasma generator 20 includes a microwave source 21 for generating microwaves, and a waveguide 22 associated with the microwave source.

An example of the microwave source 21 is a magnetron, and receives power to generate microwaves. In addition, the plasma controller 23 is installed at one side to adjust the generation output of the microwave.

In addition, the microwave generated from the microwave source is moved to one side by the waveguide (22). The waveguide may horizontally move the generated microwaves horizontally, and taper portions 221 may be formed on one side to agglomerate the microwaves with high density to maximize the output electric field.

In this way, the horizontal waveguide 22 has a hydrogen sulfide supply chamber 10 communicating with the upper end of the microwave where the generated microwaves are densely agglomerated, and the plasma decomposition chamber 30 communicates with the lower end of the waveguide on the same axis. . In addition, the hydrogen sulfide supply chamber and the portion adjacent to the plasma decomposition chamber communicate with the nitrogen supply pipe to form the internal pressure of the waveguide at the same or similar high pressure as that of the hydrogen sulfide supply chamber 10 or the plasma decomposition chamber 30 to supply the hydrogen sulfide supply chamber. Plasma generating gas that is moved from the plasma decomposition chamber to the inside of the waveguide is not dispersed.

In addition, the waveguide 22 is installed vertically with the quartz tube 25 at the end portion where the microwaves are agglomerated with high density, and the upper end of the quartz tube is installed in communication with the hydrogen sulfide supply chamber 10, the quartz coaxially Plasma decomposition class chamber 30 may be installed in communication with the lower end of the tube. This is to allow the mixed gas supplied through the hydrogen sulfide supply chamber to be supplied only to the plasma decomposition chamber without being dispersed into the waveguide. In addition, the quartz tube is not made of a metal material such as a gas supply chamber or a fuel supply chamber, so that the metal tube may be heated and melted by a high-density microwave, so that the quartz tube is placed in order to prevent this.

The communication between the waveguide 22, the hydrogen sulfide supply chamber 10, and the plasma decomposition chamber 30 is to facilitate plasma generation by microwaves, and the hydrogen sulfide supply chamber 10 in addition to the communicated form as shown. ) And the plasma decomposition chamber 30 may be formed as one chamber, and the chamber may be piped so as to be inserted into the waveguide so that an electric field by the microwave is formed inside the chamber.

The plasma generating gas passing through the waveguide 22 is in a dissociated state in which gas molecules are disconnected from the electric field applied by the waveguide, thereby forming a plasma flame. The plasma flame is formed long in the plasma decomposition chamber 30 by a high speed fluid flow.

The plasma decomposition chamber 30 has a plasma flame 24 formed long by the plasma generator is located inside the chamber. Therefore, the synthesis gas containing hydrogen sulfide mixed with the plasma generating gas is dissociated by contacting with the plasma flame in the plasma decomposition chamber, thereby disconnecting the molecules. That is, hydrogen sulfide (H ₂ S) is separated into H and S, and H ₂ and CO, which are other components of the syngas injected together, are also dissociated in atomic units.

The dissociated atoms pass through the recombination chamber 40 in communication with the lower portion of the plasma decomposition chamber, thereby forming interatomic bonds. At this time, the bonding force of HH, CO, NN is made stronger than the bonding force between HS, CS, OS, NS while passing through the recombination chamber is divided into the flammable gas of H ₂ , CO, N ₂ and sulfur (S) of the solid. In other words, if only the hydrogen sulfide is separated and judged, H ₂ and solid sulfur (S) are received upon recombination after dissociation by plasma to receive additional flammable gas and high value solid sulfur.

In addition, the internal flow path including the recombination chamber is controlled by a flow rate regulator so that the gas and solid sulfur (S) generated are moved to the lower portion of the recombination chamber and discharged through the discharge port 41.

Combustible gas and solid sulfur discharged through the outlet are separated by a cyclone 50, the separated flammable gas and solid sulfur (S) is to be collected in the synthetic gas capture tank 60 and sulfur capture tank 70, respectively. . Here, the combustible gas may be directly supplied to a using device such as a gas engine to be used.

Here, the gas component separated by the cyclone 50 may be analyzed by the component analyzer 80 to adjust the plasma generation gas supply amount or the synthesis gas supply amount or the microwave generation output of the plasma generator by the analysis value. In addition, the control may be performed through a separate control unit, and the plasma controller may be configured as a part of the control unit.

In addition, the hydrogen sulfide removal method using the hydrogen sulfide removal device of the present invention as described above with reference to Figure 4,

A mixed gas supplying step including hydrogen sulfide for supplying a mixed gas including a plasma generating gas and a synthesis gas including hydrogen sulfide to turn into a hydrogen sulfide supply chamber is performed. The step may include a gas mixing step of sufficiently mixing through the mixing device so that the synthesis gas and the plasma generating gas is mixed relatively uniformly.

Next, a microwave supply step of supplying a microwave generated by the plasma generator to the supplied mixed gas is made.

The plasma flame forming step of dissociating molecules of the plasma generating gas in the mixed gas by the electric field generated by the microwave supplied in the above step to discharge the plasma with an igniter to form a plasma flame. The plasma flame is formed by turning the mixed gas at a high pressure to form a plasma flame in the chamber.

When the synthesis gas containing hydrogen sulfide is passed through the plasma flame, the hydrogen sulfide decomposition step in which the hydrogen sulfide included in the synthesis gas is decomposed into elemental units of sulfur and hydrogen is performed.

The decomposed hydrogen and other combustible gases are recombined in a relatively strong bonding order while leaving the plasma flame and passing through the recombination chamber to generate hydrogen, carbon monoxide and nitrogen gas, and sulfur is moved or aggregated to a solid state. Is performed.

The hydrogen gas and solid sulfur are separated through a cyclone, and a separate collection step of collecting each of them into a separate collection tank is performed to decompose hydrogen sulfide included in the synthesis gas into a microwave plasma to receive additional combustible gases hydrogen and solid sulfur. By separating and removing, hydrogen sulfide in the syngas can be almost removed. This makes it possible to supply a high-temperature synthesis gas to a gas engine or gas power generation immediately and use it to significantly reduce the additional heating step to increase the gas temperature, thereby improving thermal efficiency.

The present invention will be described through the following examples.

Example 1

Hydrogen sulfide removal experiment was performed using a hydrogen sulfide removal apparatus using a microwave plasma according to the present invention shown in FIG.

In order to easily determine the decomposition of hydrogen sulfide, instead of using a synthesis gas containing hydrogen and carbon monoxide, a mixed gas diluted with hydrogen sulfide in nitrogen gas was used as a virtual synthesis gas.

The concentration of hydrogen sulfide gas in nitrogen gas ranged from 800ppm up to 1500ppm, and simulated a bad condition similar to or higher than 600ppm, which is the hydrogen sulfide concentration contained in syngas produced in the general coal gasification process.

At this time, the flow rate of the injected gas was fixed at 12 liters per minute, and the quantitative and qualitative analysis of the gas after the formation of the plasma flame was analyzed using GC and the detection tube. Table 1 shows the results of hydrogen sulfide decomposition using microwave plasma according to the plasma power and the concentration of hydrogen sulfide gas.

As shown in Table 1, it was confirmed that 96 ppm hydrogen sulfide was decomposed to 30 ppm after passing the plasma flame at 800 ppm of hydrogen sulfide-containing gas under 1.6 kW of plasma power, and 95% hydrogen sulfide even at a low plasma power of 1.2 kW. Decomposition rate results were obtained.

In addition, hydrogen sulfide decomposition rate of 93% and 91.5% was confirmed when 1,067 ppm and 1,524 ppm hydrogen sulfide-containing gas were treated with microwave plasma flame at 1.2 kW plasma power.

Therefore, when the concentration of hydrogen sulfide in the process gas is high, high plasma power is required to secure a high decomposition rate of the hydrogen sulfide concentration suitable for the post-stage process.

In addition, it was possible to confirm the generation of hydrogen in the exhaust gas due to decomposition of the hydrogen sulfide gas treated with the plasma flame, and the higher the amount of hydrogen sulfide gas before the treatment, the higher the amount of hydrogen produced.

Preferably, the plasma power of about 2.0 kW may be appropriate for the treatment and removal of high-purity hydrogen sulfide of 99% or more of the coal gasification process that produces a synthesis gas containing 12 L of hydrogen sulfide per minute.

Example 2

H ₂ S 3509 ppm, COS 1056 ppm, N ₂ was used as the synthesis gas and the hydrogen sulfide removal experiment was carried out by the same method as in Example 1, and the experimental conditions and the results are shown in Table 2.

As shown in Table 2, even when CO was included, it was found that the result of the decomposition of hydrogen sulfide was similar to that of Example 1, and in the absence of plasma flame, hydrogen sulfide was not completely decomposed.

In addition, Figure 5 is a photograph showing the solid sulfur collected in the sulfur collecting tank after the hydrogen sulfide removal experiment. As described above, since solid sulfur is adsorbed on the inner wall after the experiment, it can be seen that the solid sulfur is separated by plasma.

In addition, the above-mentioned example is only an example to demonstrate this invention. Therefore, it is obvious that the ordinary skilled in the art to which the present invention pertains uses the partial change with reference to the detailed description.

1: hydrogen sulfide removal device
10: hydrogen sulfide supply chamber 11: mixing device
12: mixed gas supply pipe 13: igniter
20: plasma generator 21: microwave source
22: waveguide 23: plasma controller
24: plasma flame 25: quartz tube
221 taper portion
30: plasma decomposition chamber
40: recombination chamber 41: outlet
50: cyclone
60: synthetic gas catch tank
70: Huangpu collection tank
80: Component Analyzer

Claims (4)

In the hydrogen sulfide removal device that receives the synthesis gas generated from the gasification of hydrocarbon fuel to decompose and remove hydrogen sulfide contained in the synthesis gas under a high temperature microwave plasma flame,
A hydrogen sulfide supply chamber 10 which is a vertical tube supplied with a synthesis gas containing hydrogen sulfide and a plasma generating gas;
The microwave generated by the waveguide 22, which is a horizontal tube communicating with the hydrogen sulfide supply chamber, is moved to a portion communicating with the hydrogen sulfide supply chamber, and the electric field generated by the high-density coagulation of the microwave is raised to raise the supplied plasma generating gas. A plasma generator (20) which dissociates and forms a plasma flame (24) by plasma discharge;
A vertical tube communicating with the lower end surface of the plasma generator waveguide 22 to be connected to the same axis as the hydrogen sulfide supply chamber 10, and having a plasma flame positioned therein so that the supplied hydrogen sulfide is introduced into the plasma flame and decomposed. A chain plasma decomposition chamber 30;
A recombination chamber 40 which is a vertical tube coupled to communicate with a lower end of the plasma decomposition chamber 30 to recombine and separate hydrogen from hydrogen sulfide elements decomposed into a plasma flame;
A cyclone (50) installed at a lower end of the recombination chamber to separate the synthesis gas and solid sulfur which are combustible gases;
Hydrogen sulfide removal apparatus using a microwave plasma, characterized in that it comprises a; synthetic gas capture tank (60) and sulfur capture tank (70) for collecting the synthesis gas and solid sulfur separated by the cyclone, respectively. The method of claim 1,
The plasma generator 20 is
A microwave source 21 that receives power to generate microwaves;
A waveguide 22 which is a horizontal tube having a taper portion 221 for maximizing the output electric field by moving the microwave generated from the microwave source to one side and agglomerating the microwave at high density in a moving process;
Hydrogen sulphide removal apparatus using a microwave plasma comprising a; plasma control unit for controlling the microwave generation output of the microwave source. The method of claim 1,
The plasma generating gas is nitrogen,
The synthesis gas and nitrogen containing the hydrogen sulfide are mixed by the mixing device 11, the mixed gas supply pipe 12 for supplying a mixed gas of the mixed synthesis gas and nitrogen is the side from the axis center of the hydrogen sulfide supply chamber (10) Hydrogen sulfide removal device using a microwave plasma, characterized in that the gas supplied to be installed to face the downward direction spaced apart to move while rotating the inside of the chamber at a high speed. Hydrogen sulfide supply chamber which is a vertical tube supplied with synthesis gas containing hydrogen sulfide and plasma generating gas, plasma decomposition chamber which is a vertical tube in which the supplied hydrogen sulfide is decomposed into a plasma flame, and sulfur by hydrogen recombining hydrogen among hydrogen sulfide decomposed elements Hydrogen sulfide using the apparatus according to claim 1 to 3 to vertically pipe the recombination chamber, which is a vertical pipe separating from the upper and lower ends, and to communicate the waveguide of the plasma generating device between the hydrogen sulfide supply chamber and the plasma decomposition chamber. In the removal method,
A mixed gas supplying step including hydrogen sulfide for supplying a mixed gas including a plasma generation gas and a synthesis gas including hydrogen sulfide to be turned into a hydrogen sulfide supply chamber;
A microwave supplying step of supplying microwaves generated by the plasma generator to the supplied mixed gas;
A plasma flame forming step of dissociating molecules of the plasma generating gas in the mixed gas by an electric field of the supplied microwave to form a plasma flame by plasma discharge;
A hydrogen sulfide decomposition step of decomposing hydrogen sulfide into elemental units of sulfur and hydrogen by passing a synthesis gas containing hydrogen sulfide through the plasma flame;
A recombination step of recombining the decomposed hydrogen into a hydrogen gas which is a combustible gas, and sulfur condensing in a solid state;
Separation collecting step of separating the hydrogen gas and solid sulfur through a cyclone and separately collecting each of the hydrogen sulfide removing method using a microwave plasma comprising a.

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