JPH11147023A - Method and apparatus for burning hydrogen sulfide-containing gas - Google Patents

Abstract

PROBLEM TO BE SOLVED: To avoid to generate unburnt H2 S and SO2 when H2 S-contg. gas separated from a gas formed by coal gasification is burnt. SOLUTION: A gas with a lower oxygen concn. than the oxygen concn. of ordinary air is mixed in air for combustion for oxidizing H2 S fed to an H2 S combustion furnace 11 so as to make oxygen concn. of the air for combustion fed to the H2 S combustion furnace 11 lower concn. than the oxygen concn. of ordinary air, pref. an oxygen concn. of at most 16% and H2 S is burnt.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to a method for absorbing a sulfur compound represented by hydrogen sulfide (H ₂ S) contained in a gas produced by gasifying a fine solid carbonaceous raw material represented by coal. The present invention relates to a combustion method and an apparatus for burning an H ₂ S-containing gas obtained by desorbing an absorbed sulfur compound from the absorbent into sulfur dioxide (SO ₂ ).

[0002]

2. Description of the Related Art Conventionally, various types of furnaces for gasifying solid carbonaceous raw materials such as coal have been proposed, including a fixed bed, a fluidized bed, and an airflow bed. In these methods, the gas flow layer is used to make the raw material into fine powder and supply it to the furnace at a temperature (about 1300 to 1600 ° C) higher than the melting point of the raw ash together with oxidizing agents such as oxygen and air. It has features such as a higher gasification efficiency, a wider range of applied coal types, and superior environmental compatibility as compared with the above method. Therefore, this gas-bed coal gasification method is suitable for production of fuels and raw materials for syngas, combined cycle power generation, fuel cells and the like, and is being developed in Japan and overseas.

[0003] Coal contains sulfur (S), which is converted into hydrogen sulfide (H ₂ S) and carbonyl sulfide (COS) by gasification. The concentration of these sulfur compounds is governed by the S content in the raw material.
It is from 00 to several thousand ppm. Therefore, when the gas generated by coal gasification is used as a fuel and raw material for synthesis gas, combined power generation, fuel cells, and the like, it is necessary to remove the sulfur compounds in the produced gas. There is a wet method. The dry method is a method in which H ₂ S is reacted with a metal oxide such as iron or Ni, and then the H ₂ S is oxidized with an oxygen-containing gas and regenerated as a metal oxide. And it has not been put to practical use. On the other hand, the wet method has been conventionally developed in a petrochemical process, and uses an alkanolamine absorbing solution or the like to remove H _2.
After absorbing S, this liquid is introduced into another column, and then decompressed and heated to desorb H ₂ S, and then recovered as elemental S by the Claus reaction.

[0004] As a method for treating sulfur compounds generated by coal gasification, a wet method that has a proven track record is highly reliable. However, elemental sulfur recovered by the Claus method has drawbacks such as a sluggish market and hazardous materials. However, if it is finally recovered in the form of gypsum (CaSO ₄ ), it has marketability. Since it is not a hazardous material, it is preferable to recover it in the form of gypsum particularly in a plant that processes a large amount of coal such as an integrated coal gasification combined cycle. To recover in the form of plaster,
The desorbed high-concentration H ₂ S-containing gas may be oxidized to sulfur dioxide (SO ₂ ), and the SO ₂ may be introduced into a conventionally used limestone gypsum desulfurizer for treatment.

[0005]

SUMMARY OF THE INVENTION The present invention is directed to a high concentration H
_{The present invention} relates to a combustion furnace for oxidizing ₂ S-containing gas to SO ₂ by combustion.

[0006] The reaction formula for H ₂ S combustion is shown below.

H ₂ S + (3/2) O ₂ → SO ₂ + H ₂ O (1) 2H ₂ S + SO ₂ → 3S + 2H ₂ O (2) SO ₂ + (1/2) O ₂ → SO ₃ ... (3) SO ₃ + H ₂ O → H ₂ SO ₄ ... (4) Equation (1) is the target oxidation reaction of H ₂ S to SO ₂ , but in the case of insufficient air. When H ₂ S is burned and oxygen is lost, the remaining H ₂ S and the generated SO ₂ form solid S by the reaction of equation (2). The reaction of the formula (1) is fast,
The reaction of equation (2) is slow. In the Claus method for recovering solid S, the reaction of the formula (2) is accelerated by using a catalyst such as bauxite. Limestone gypsum method desulfurization apparatus installed downstream of the combustion furnace for a reactor to absorb SO ₂ in the limestone slurry, allowed to react by supplying an excess of oxygen with respect to H ₂ S (1) formula Therefore, it is necessary to prevent the reaction according to the formula (2) from taking place, and for that purpose, as described later, combustion with excess oxygen at an air ratio of 1.0 or more is performed. However, if the combustion is carried out with an excess of oxygen having an air ratio of 1 or more, oxygen is excessively present and the flame temperature becomes high. Therefore, according to the equation (3), SO ₂ is further oxidized to generate SO ₃ . This SO ₃ reacts with water to form a fine sulfuric acid mist according to the equation (4). This mist is not sufficiently recovered by the limestone gypsum desulfurization apparatus and is released into the atmosphere by the flow of the exhaust gas, which is environmentally undesirable. In addition, special consideration must be given to the corrosion of the material.

It is an object of the present invention to provide a combustion method for preventing unburned H ₂ S and SO ₃ from being generated from high concentration H ₂ S.

[0009]

Above object for Solving the Problems As a concentration lower than the oxygen concentration of the oxygen concentration of the oxidant air supplied in order to oxidize the H ₂ S, it can be achieved by burning H ₂ S.

The ignition temperature of H ₂ S is about 250 ° C., which is about 60 ° C., which is lower than the ignition temperature of hydrocarbon fuels such as methane and propane.
It is about 350 ° C. lower than 0 ° C. Therefore, H ₂ S
Is ignited at a low temperature and becomes SO ₂ by the reaction of (1). If the oxygen partial pressure is high, the reaction rate increases and the reaction is completed in a short time. However, when the oxygen concentration in the air supplied as the oxidant is low, the sensible heat is taken away by the nitrogen gas contained in the air, and the flame temperature decreases. Also, since the oxygen concentration is low, slow combustion is performed. Therefore, the reaction of SO _{2 due} to excess oxygen according to the equation (3) is suppressed, and the generation of SO ₃ is reduced. The inventors burned a gas containing 50% of H ₂ S in a combustion furnace while changing the oxygen concentration of the oxidizing agent, and measured the amount of SO ₃ generated. FIG. 5 shows the experimental results. It was found that when the oxygen concentration of the oxidizing agent was reduced, the amount of generated SO ₃ was reduced.

[0011] A first means of the present invention to achieve the above object is to absorb a sulfur compound contained in a gas generated by coal gasification into an absorbent, and to desorb the absorbed sulfur compound from the absorbent. A combustion method in which an oxidizing agent is supplied to an H ₂ S-containing gas obtained by the above-described method and the oxidizing agent is burned is characterized in that a gas having an oxygen concentration lower than that of air is subjected to a burning treatment as an oxidizing agent.

[0012] second means of the present invention to achieve the above object, in the first means guides the gas generated by the combustion of H ₂ S-containing gas to the SO ₂ absorption means, the SO ₂ absorption means wherein a portion of the passage gas mixed with air H ₂
It is characterized in that the oxidizing agent for combusting the S-containing gas is used.

[0013] A third means of the present invention for achieving the above object is the above-mentioned first means, wherein a part of exhaust gas of a gas turbine driven by using gas generated by gasification of coal as fuel is mixed with air. Wherein the H ₂ S-containing gas is used as the oxidizing agent for combustion treatment.

A fourth means of the present invention for achieving the above-mentioned object is characterized in that in any one of the first to third means, the oxygen concentration of the oxidizing agent is 16% or less.

A fifth means of the present invention for achieving the above object is to cause a sulfur compound contained in a gas generated by gasification of coal to be absorbed by an absorbent, and to remove the absorbed sulfur compound from the absorbent. In a combustion method in which an oxidizing agent is supplied to the H ₂ S-containing gas obtained as a result of the burning and the oxidizing agent is burned, the H ₂ S-containing gas obtained by desorbing from the absorbent has a lower oxygen concentration than the H ₂ S-containing gas. _The combustion process is performed by diluting the 2S-containing gas.

According to a sixth aspect of the present invention to achieve the above object, the fifth aspect is characterized in that a nitrogen gas separated from air by an air separator is used as a gas for diluting the H ₂ S-containing gas. And

A seventh means of the present invention for achieving the above object is the fifth means, wherein the exhaust gas of a gas turbine driven by using a gas generated by gasification of coal as a fuel is obtained by using the H ₂ S-containing gas. H ₂ used as a diluting gas
It is characterized in that the S-containing gas is diluted and burned.

According to an eighth aspect of the present invention to achieve the above object, there is provided a fuel cell system according to any one of the first to fourth means, wherein the oxygen concentration of the H ₂ S-containing gas obtained by desorbing the oxygen concentration from the absorbent is changed. The method is characterized in that the H ₂ S-containing gas is diluted with a gas having a concentration lower than that of the gas and subjected to combustion treatment.

According to a ninth aspect of the present invention for achieving the above object, in the above eighth aspect, a nitrogen gas separated from air by an air separation device is used as a gas for diluting the H ₂ S-containing gas. And

A tenth means of the present invention for achieving the above object is the above-mentioned eighth means, wherein the exhaust gas of a gas turbine driven by using a gas generated by gasification of coal as a fuel is provided with the H ₂ S-containing gas. H ₂ used as a diluting gas
It is characterized in that the S-containing gas is diluted and burned.

An eleventh means of the present invention for achieving the above object is to absorb a sulfur compound contained in a gas generated by coal gasification into an absorbent, and to desorb the absorbed sulfur compound from the absorbent. An H ₂ S combustion apparatus for supplying an oxidizing agent to an H ₂ S-containing gas obtained by the combustion and burning the gas, a pipe for supplying combustion air to the H ₂ S combustion apparatus, and a pipe connected to the pipe for air combustion. An oxygen diluent supply line for supplying a gas having a low oxygen concentration is provided.

According to a twelfth aspect of the present invention for achieving the above object, a sulfur compound contained in a gas generated by gasification of coal is absorbed by an absorbent, and the absorbed sulfur compound is desorbed from the absorbent. in H ₂ S combustion device for burning by supplying an oxidizing agent to the H ₂ S-containing gas obtained by, connected to the supply line of the H ₂ S-containing gas to the H ₂ S combustion device H ₂ S-containing gas H ₂ for supplying gas with lower oxygen concentration
An S diluent supply pipe is provided.

A thirteenth aspect of the present invention for achieving the above object is the eleventh aspect, wherein the H ₂ S combustion apparatus has an H ₂ S combustion apparatus.
An H ₂ S diluent supply line connected to a line for supplying an S-containing gas and supplying a gas having a lower oxygen concentration than the H ₂ S-containing gas is provided.

[0024]

(Embodiment 1) Hereinafter, the first embodiment of the present invention will be described.
The embodiment will be described with reference to FIG. FIG. 1 shows an absorption tower 3 for absorbing a sulfur compound in a gas generated in a gasification furnace into an absorbent 8, a desorption tower 4 for desorbing H ₂ S from the absorbent 8, and a first embodiment of the present invention. 1 illustrates an example H ₂ S combustion device. The absorption tower 3 and the desorption tower 4 constitute a desulfurization device.

The H ₂ S combustion apparatus shown in the figure is an H ₂ S combustion furnace 11 for burning H ₂ S, and H ₂ S is supplied from the desorption tower 4 to the H ₂ S combustion furnace 11.
A pipe 10 for supplying ₂ S-containing gas, a pipe 16 for supplying combustion air 13 to the H ₂ S combustion furnace 11, and connected to the pipe 16 and containing oxygen such as nitrogen and CO ₂ from a supply source such as a cylinder. Line 1, which is an oxygen diluent supply line for supplying unreacted gas
2 and a fan 14 interposed in the conduit 16.

The operation of the apparatus having the above configuration will be described below. Gas containing sulfur compounds such as H ₂ S generated in the pressurized gasification furnace is dedusted by a dedusting device (not shown).
The sulfur compound is led to the absorption tower 3 by the pipe 1 and is absorbed by the absorbent 8. The gas from which the sulfur compounds have been absorbed and removed is sent from a pipe 2 to a gas turbine (not shown). The absorbent 8 having absorbed the sulfur compound is supplied to the low-pressure desorption tower 4.
H ₂ S is desorbed by heating if necessary. The desorbed gas containing a high concentration of H ₂ S is sent to an H ₂ S combustion furnace 11 via a pipe 10 and burns to produce SO ₂ . The generated gas containing SO ₂ is sent to a limestone gypsum method desulfurization apparatus (not shown) through a pipe 15. A fan 14 is connected to the H ₂ S combustion furnace 11 via a pipe 16.

In this embodiment, a gas containing no oxygen, such as nitrogen or CO ₂ , is supplied to the pipe 12 from a supply source such as a cylinder.
To reduce the oxygen-containing gas sent to the H ₂ S combustion furnace 11, that is, the oxygen concentration of the oxidant,
It burns with excess air with an air ratio of 1 or more. Since the slow combustion of H ₂ in S combustion furnace 11 H ₂ S is carried out by doing so, to generate SO ₃ and unburned H ₂ S in the gas discharged from the H ₂ S combustion furnace 11 Thus, the H ₂ S-containing gas can be changed to the SO ₂ -containing gas without any change. Accordingly flows into the limestone gypsum method desulfurizer unburned H ₂ S is not shown, connected to the conduit 15, where it is possible without the released left out of the system not desulfurized and environment with the SO ₃ generated There is no surface problem, and there is no corrosion by SO ₃ .

As an operation method of this embodiment, the pipe 1
6 detects the oxygen concentration of the combustion air supplied to the H ₂ S combustion furnace 11, and determines the amount of oxygen-free gas to be injected into the line 16 from the line 12. May be controlled so as to be equal to or lower than a certain value lower than the oxygen concentration of the above. As is clear from FIG. 5, it is desirable that the constant value be 16%. Or fan 1
4 controls the amount of air sent to the H ₂ S combustion furnace 11 and adjusts the oxygen-free gas in accordance with the opening of a valve (not shown). The opening of the valve (not shown) is controlled in conjunction with the opening. I just need. Further, a method of controlling only the supply amount of the oxygen-free gas supplied from the pipe line 12 according to the high-concentration H ₂ S-containing gas amount may be used. In short, in this embodiment, the oxygen concentration of the air used for combustion of the H ₂ S-containing gas is set to a value lower than that of ordinary air, and combustion is performed with excess air.

In the above embodiment, a gas containing no oxygen, such as nitrogen or CO ₂ , is used as the diluting gas supplied from the pipe 12. However, a gas having a lower oxygen concentration than ordinary air, preferably a gas having an oxygen concentration of 16% or less, may be used.

(Embodiment 2) FIG. 2 shows a second embodiment of the present invention.
This will be described with reference to FIG. The embodiment shown in FIG. 2 is different from the first embodiment in that, in the embodiment shown in FIG. 1, a pipe 12 for supplying a gas containing no oxygen is connected to a pipe 16 and a gas containing no oxygen is provided. Is supplied to the combustion air flowing through the pipe 16 to reduce the oxygen concentration of the combustion air. In the present embodiment, the H ₂ S-containing gas is supplied to the H ₂ S combustion furnace 11 by the pipe 10. Is connected to a pipeline 12 for supplying a gas containing no oxygen such as nitrogen gas. The other configuration is the same as that of the first embodiment, so that the same reference numerals are given and the description is omitted.

In the present embodiment, a gas not containing oxygen, such as nitrogen or CO ₂ , is injected into the H ₂ S-containing gas flowing through the pipe 10 from a supply source such as a cylinder through the pipe 12.
H ₂ to reduce the concentration of H ₂ S in H ₂ S-containing gas to be sent to the S combustion furnace 11, and combustion air ratio of 1 or more excess air. Since the slow combustion of H ₂ in S combustion furnace 11 H ₂ S is carried out by doing so, to generate SO ₃ and unburned H ₂ S in the gas discharged from the H ₂ S combustion furnace 11 Thus, the H ₂ S-containing gas can be changed to the SO ₂ -containing gas without any change. Therefore, unburned H ₂ S is transferred to the line 15
No not be desulfurized in the connected limestone gypsum method desulfurization apparatus, not shown, to, also without problems environmental accompanying SO ₃ generation, further, the corrosion caused by SO ₃ is also become completely eliminated.

As an operation method of the present invention, the amount of oxygen-free gas to be injected into the pipe 10 corresponding to the amount of the H ₂ S-containing gas supplied from the pipe 10 to the H ₂ S combustion furnace 11 is described. May be controlled so that the ratio becomes constant.

In the above embodiment, a gas containing no oxygen, such as nitrogen or CO ₂ , is used as the dilution gas supplied from the pipe 12. However, H ₂ S flowing through the pipeline 10
A gas having a lower oxygen concentration than the contained gas may be used.

(Embodiment 3) FIG. 3 shows a combined cycle system according to a third embodiment of the present invention. The illustrated apparatus includes a pulverized coal storage tank 40, a coal gasification furnace 30 connected to the pulverized coal storage tank 40 by a pulverized coal pipeline 41, and a pipe 31 connected to the coal gasification furnace 30.
, A H ₂ S combustion furnace 11 connected to the desulfurization device 62 by a pipe 10, and a H ₂ S combustion system. A limestone gypsum desulfurization apparatus 70 connected to the furnace 11 by a pipe 15 and a gas turbine 90 connected to the desulfurization apparatus 62 by a pipe 91
An exhaust heat recovery boiler 100 connected to an exhaust gas outlet of a gas turbine 90 by an exhaust gas line 92;
Chimney 11 connected to the exhaust gas outlet at 00 by an exhaust pipe 93
0, a pipe 71 communicating the gas outlet of the limestone gypsum method desulfurization apparatus 70 with the exhaust pipe 93, and an air compressor 80 which is directly connected to the gas turbine 90 and compresses the air 83.
And the air outlet of the air compressor 80 and the gas turbine 90
Compressed air line 82 connecting the air inlet of the air, air separation device 50 connected to compressed air line 82 by air line 81 for the separation device, nitrogen outlet of air separation device 50 and pulverized coal line 41 Nitrogen line 51 connecting the air separation device 5
An oxygen pipe 52 connecting the oxygen outlet of the coal gasifier 30 to the oxygen outlet of the coal gasifier 30; a fan 14 connected to the H ₂ S combustion furnace 11 by a pipe 16 to blow the combustion air 13;
And a nitrogen line 53 communicating the nitrogen line 51, and a nitrogen line 53A communicating the nitrogen line 53 with the line 10.

In this embodiment, the H ₂ S combustion furnace 1 is prepared by mixing a nitrogen gas separated by an air separator as an oxygen-free gas into a combustion oxygen-containing gas (air) flowing through a pipe 16.
With lowering the oxygen concentration of the oxidizing agent to be supplied to 1, contaminating H ₂ S-containing gas and nitrogen gas separated by the air separation unit to the H ₂ S-containing gas flowing through the pipe 10 as a gas containing no oxygen Is burned with excess air having an air ratio of 1 or more.

According to this embodiment, the same effects as those of the first and second embodiments can be obtained.

(Embodiment 4) FIG. 4 shows a combined cycle system according to a third embodiment of the present invention. The difference between this embodiment and the third embodiment shown in FIG. 3 is that in this embodiment, the exhaust gas line 101 connecting the exhaust line 93 and the line 16 is used instead of the nitrogen lines 53 and 53A. A fan 103 interposed between the exhaust gas line 101 and the exhaust gas flowing through the exhaust line 93 to send the exhaust gas to the line 16, a line 34 communicating the line 71 with the line 16, and an interposed line in the line 34. And a fan 33 for sending the gas flowing through the pipeline 71 to the pipeline 16. The other configuration is the same as that of the first embodiment, so that the same reference numerals are given and the description is omitted.

In this embodiment, the low oxygen concentration discharged from the desulfurization unit 70 is used as a means for reducing the oxygen concentration of the air for combustion of hydrogen sulfide and burning the air under an oxygen excess condition of an air ratio of 1 or more. This is an example of a case in which a gas having a low oxygen concentration is discharged from the gas turbine 90 and passed through an exhaust heat recovery boiler. The nitrogen gas generated by the air separation device shown in FIG.
It is pressurized to Pa, and it is uneconomical to use this pressurized nitrogen gas under normal pressure. In this embodiment, H ₂ S
Recycling the SO ₂ discharged from the SO ₂ treatment apparatus such as a combustion furnace or limestone gypsum method desulfurizer almost free gas discharged from the atmospheric pressure of the gas or gas turbines, for the oxygen concentration decrease in the combustion air It is economical because it can be used.

When the combustion air is divided and, for example, the two-stage combustion is performed, the combustion reaction is performed by the Claus reaction shown in the equation (2).
In this embodiment, combustion air or H ₂
The H ₂ S-containing gas is burned without dividing the S-containing gas in the flow direction of the combustion gas.

[0040] In this embodiment or the first embodiment, further, H ₂ supplied to the H ₂ S combustion furnace from the desulfurizer
The S-containing gas may be nitrogen gas or CO ₂ gas supplied from a cylinder as shown in FIG. 2, nitrogen gas supplied from an air separation device as shown in FIG. 3, or gas turbine or limestone gypsum desulfurization. The same effect as in the third embodiment can be obtained by diluting with exhaust gas having a low oxygen concentration discharged from the apparatus. By combining any of the above-described means for reducing the oxygen concentration of the oxidizing agent with any of the means for diluting the H ₂ S-containing gas supplied to the H ₂ S combustion furnace from the desulfurization device, The effect obtained in the second embodiment can be obtained.

[0041]

According to the present invention, the H ₂ S-containing gas obtained by removing and desorbing sulfur compounds contained in the coal gasification gas can be produced without generating SO ₃ , S and unburned H ₂ S. ,
Since the sulfur compound can be changed by burning to the SO ₂ -containing gas, the sulfur compound can be desulfurized with high efficiency by the subsequent limestone gypsum method desulfurization apparatus. In particular, there is no corrosion trouble such as piping caused by SO ₃ .

[Brief description of the drawings]

FIG. 1 is a conceptual diagram showing a first embodiment of the present invention.

FIG. 2 is a conceptual diagram showing a second embodiment of the present invention.

FIG. 3 is a system configuration diagram showing a third embodiment of the present invention.

FIG. 4 is a system configuration diagram showing a fourth embodiment of the present invention.

FIG. 5: Oxygen concentration of oxidant and SO ₃ in H ₂ S combustion furnace
6 is a graph showing the experimental results of the relationship between the amounts of generation.

[Explanation of symbols]

1, 2 Pipeline 3 Absorption Tower 4 Desorption Tower 8 Absorbent 10 Pipeline 11 H ₂ S Combustion Furnace 12 Pipeline 13 Combustion Air 14 Fan 15, 16 Pipeline 30 Coal Gasifier 31 Pipeline 33 Fan 34 Pipe Road 40 Pulverized coal storage tank 41 Pulverized coal line 50 Air separation device 51 Nitrogen line 52 Oxygen line 53, 53A Nitrogen line 60 Dedusting device 62 Desulfurization device 70 Coal gypsum method desulfurization device 71 Line 80 Air compressor 81 Separator air line 82 Compressed air line 83 Air 90 Gas turbine 91 Line 92 Exhaust gas line 93 Exhaust line 100 Exhaust heat recovery boiler 101 Exhaust gas line 103 Fan 110 Chimney

Claims (13)

[Claims] 1. An H ₂ S-containing gas obtained by absorbing a sulfur compound contained in a gas generated by gasification of coal into an absorbent and desorbing the absorbed sulfur compound from the absorbent. A method of burning hydrogen sulfide-containing gas, comprising: performing combustion treatment by using a gas having an oxygen concentration lower than that of air as an oxidant in a combustion method of supplying and burning oxygen. 2. A combustion method hydrogen sulfide-containing gas according to claim 1, lead to gas generated by the combustion of H ₂ S-containing gas to the SO ₂ absorption means, the gas passing through the SO ₂ absorption means A method for burning a hydrogen sulfide-containing gas, wherein a part of the gas is mixed with air to be used as the oxidizing agent for burning the H ₂ S-containing gas. 3. The method for burning a hydrogen sulfide-containing gas according to claim 1, wherein a part of exhaust gas of a gas turbine driven by using gas generated by gasification of coal as fuel is mixed with air to form the H ₂ gas. A method for burning a hydrogen sulfide-containing gas, the method comprising using the oxidizing agent for performing a combustion treatment on an S-containing gas. 4. The method for burning a hydrogen sulfide-containing gas according to claim 1, wherein the oxygen concentration of the oxidizing agent is 16% or less. 5. An H ₂ S-containing gas obtained by absorbing a sulfur compound contained in a gas generated by coal gasification into an absorbent and desorbing the absorbed sulfur compound from the absorbent. Wherein the oxygen concentration is desorbed from the absorbent to obtain H ₂ S.
A method for burning a hydrogen sulfide-containing gas, comprising diluting the H ₂ S-containing gas with a gas having a lower oxygen concentration than the contained gas and performing a combustion treatment. 6. The method for burning a hydrogen sulfide-containing gas according to claim 5, wherein a nitrogen gas separated from air by an air separation device is used as a gas for diluting the H ₂ S-containing gas. How to burn the contained gas. 7. The method for burning a hydrogen sulfide-containing gas according to claim 5, wherein the exhaust gas of a gas turbine driven by using a gas generated by gasification of coal as the fuel is used as the H ₂ gas.
A method for burning a hydrogen sulfide-containing gas, comprising diluting an H ₂ S-containing gas and performing a combustion treatment using the S-containing gas as a diluting gas. 8. The method for burning a hydrogen sulfide-containing gas according to claim 1, wherein the oxygen concentration is lower than the oxygen concentration of the H ₂ S-containing gas obtained by desorbing from the absorbent. Wherein the H ₂ S-containing gas is diluted and subjected to combustion treatment. 9. The method for burning a hydrogen sulfide-containing gas according to claim 8, wherein nitrogen gas separated from air by an air separation device is used as a gas for diluting the H ₂ S-containing gas. How to burn the contained gas. 10. The method for burning a hydrogen sulfide-containing gas according to claim 8, wherein the exhaust gas of a gas turbine driven by using a gas generated by coal gasification as the fuel is H.
_A method for burning a hydrogen sulfide-containing gas, comprising diluting an H ₂ S-containing gas and performing a combustion treatment using the ₂ S-containing gas as a diluting gas. 11. An H ₂ S obtained by absorbing a sulfur compound contained in a gas generated by coal gasification into an absorbent and desorbing the absorbed sulfur compound from the absorbent.
In a H ₂ S combustion apparatus for supplying an oxidizing agent to a contained gas and burning it, a pipe for supplying combustion air to the H ₂ S combustion apparatus, and a gas connected to the pipe and having a lower oxygen concentration than air is supplied. A hydrogen sulfide-containing gas combustion apparatus, comprising: an oxygen diluent supply pipe; 12. H ₂ S obtained by absorbing a sulfur compound contained in a gas generated by coal gasification into an absorbent and desorbing the absorbed sulfur compound from the absorbent.
In an H ₂ S combustion apparatus for supplying an oxidizing agent to a contained gas and burning it, a gas connected to a pipe for supplying the H ₂ S-containing gas to the H ₂ S combustion apparatus and having a lower oxygen concentration than the H ₂ S-containing gas is removed. An apparatus for burning a hydrogen sulfide-containing gas, comprising a supply line for an H ₂ S diluent to be supplied. 13. The hydrogen sulfide-containing gas combustion device according to claim 11, wherein the gas is connected to a pipe for supplying the H ₂ S-containing gas to the H ₂ S combustion device and has a lower oxygen concentration than the H ₂ S-containing gas. A hydrogen sulfide-containing gas combustion device, comprising a H ₂ S diluent supply pipe for supplying hydrogen.