Process for fine desulfurization of blast furnace gas

Abstract

The present application belongs to the technical field of blast furnace waste gas purification treatment, and particularly relates to a process method for fine desulfurization of blast furnace gas, S1: after blast furnace gas is subjected to a dry dedusting system, the blast furnace gas is input into a dechlorination device to remove Cl ‑ from the blast furnace gas; S2: the blast furnace gas after dechlorination of the dechlorination device is transported into a deoxygenation device, and after the blast furnace gas is subjected to deoxygenation treatment, the oxygen volume content is 0.1-0.3%; S3: the blast furnace gas after deoxygenation has a temperature of 130-180 DEG C; 30% of the blast furnace gas passes through a bypass pipeline and is combined with blast furnace gas discharged from a residual pressure turbine power generation device in a main pipeline, and after the combination, the blast furnace gas temperature is adjusted by a blast furnace gas control valve to be 90-100 DEG C; S4: the combined blast furnace gas enters a hydrolysis catalytic tower, and COS in the blast furnace gas is catalytically converted into H2S by a medium-temperature hydrolysis catalyst; S5: the blast furnace gas after hydrolysis enters a desulfurization system, and is then transmitted to each user through a blast furnace gas pipeline network. The hydrolysis catalytic efficiency is effectively improved, and the desulfurization effect is improved.

Description

Technical Field

[0001] This invention belongs to the field of blast furnace exhaust gas purification and treatment technology, specifically relating to a process method for fine desulfurization of blast furnace gas. Background Technology

[0002] Blast furnace gas, a byproduct of blast furnace smelting, is an important resource in steel production. As a combustible gas, blast furnace gas is characterized by its large volume and low calorific value. It can be used in the hot blast stoves of the blast furnace system or supplied as fuel to downstream users such as steel rolling, coking, and sintering plants. However, because blast furnace gas contains sulfides, its combustion produces SO2, which pollutes the atmosphere. National regulations stipulate that the SO2 concentration in flue gas emissions should not exceed 35 mg / Nm³. 3 .

[0003] The main sulfides in blast furnace gas are carbonyl sulfide (COS) and H2S, accounting for 70% and 30%, respectively. Because COS is chemically stable and difficult to remove directly, it is generally converted to H2S by a hydrolysis catalyst before removal. Currently, the desulfurization process for blast furnace gas is: dry dust removal - dechlorination pretreatment - COS hydrolysis system - residual pressure turbine power generation system (TRT) - dry desulfurization system. However, this process has the following drawbacks: First, the temperature of the blast furnace gas decreases after TRT power generation, and the subsequent hydrolysis system uses a low-temperature hydrolysis catalyst, resulting in low hydrolysis efficiency and poor desulfurization effect. Second, the conversion of COS to H2S increases the corrosion of the downstream TRT. Third, due to the high gas temperature, the hydrolysis catalyst is prone to oxygen poisoning, sulfur deposition, and sulfation, leading to a decrease in catalyst activity. Summary of the Invention

[0004] In view of the above-mentioned problems such as low desulfurization efficiency of blast furnace gas, easy oxygen poisoning of hydrolysis catalyst, and easy corrosion of TRT by H2S generated by hydrolysis, this invention develops a process method for fine desulfurization of blast furnace gas.

[0005] To achieve the above and other related objectives, the present invention provides a process method for fine desulfurization of blast furnace gas.

[0006] S1: After passing through a dry dust removal system, the blast furnace gas is fed into a dechlorination unit to remove Cl from the gas. - ;

[0007] S2: Blast furnace gas after dechlorination by the dechlorination unit is transported to the deoxidation unit. After deoxidation, the oxygen volume content of the gas is 0.1-0.3%.

[0008] S3: The temperature of the deoxidized blast furnace gas is 130-180℃. By adjusting the gas control valve, 70% of the gas enters the residual pressure turbine power generation unit and pressure reducing valve group. After passing through the residual pressure turbine power generation unit, the gas temperature is 30-80℃. The remaining 30% of the gas passes through the bypass pipeline and merges with the gas discharged from the residual pressure turbine power generation unit in the main pipeline. After merging, the gas temperature is adjusted to 90-100℃ by adjusting the gas control valve. Gas flow meters are installed on both pipelines to monitor and adjust the gas ratio.

[0009] S4: The mixed blast furnace gas enters the hydrolysis catalytic tower, where COS in the gas is converted into H2S by a medium-temperature hydrolysis catalyst.

[0010] S5: The hydrolyzed blast furnace gas enters the desulfurization system, where H2S is removed under the catalytic action of iron oxide, and then it is transmitted to each user through the blast furnace gas pipeline network.

[0011] In an optional embodiment of the present invention, it includes blast furnace gas, a dry dust removal system, a dechlorination device, a deoxygenation device, a gas control valve, a first gas flow meter, a residual pressure turbine power generation device, a pressure reducing valve group, a second gas flow meter, a bypass pipeline, a temperature display, a hydrolysis catalytic tower, a desulfurization system, and a blast furnace gas pipeline network.

[0012] In an optional embodiment of the present invention, blast furnace gas enters a dry dust removal system through a pipeline. The dry dust removal system is connected to one end of a dechlorination device through a pipeline, and the other end of the dechlorination device is connected to a deoxygenation device through a pipeline. The deoxygenation device is connected to a gas control valve through a pipeline. The blast furnace gas is connected to a residual pressure turbine power generation unit and a pressure regulating valve group through the control valve. The blast furnace gas is also connected to one end of a bypass pipeline through the control valve. The other end of the bypass pipeline is connected to a hydrolysis catalytic tower. The residual pressure turbine power generation unit is connected to one end of the hydrolysis catalytic tower through a temperature display. The other end of the hydrolysis catalytic tower is connected to one end of a blast furnace gas desulfurization system. The other end of the blast furnace gas desulfurization system is connected to a blast furnace gas pipeline network.

[0013] In an optional embodiment of the present invention, a first gas flow meter is disposed between the gas control valve and the residual pressure turbine power generation device and the pressure regulating valve group.

[0014] In an optional embodiment of the invention, a second gas flow meter is disposed between the control valve and the bypass pipe.

[0015] In an optional embodiment of the present invention, a temperature display is provided between the bypass pipeline and the hydrolysis catalytic tower.

[0016] In an optional embodiment of the present invention, the dechlorination device is a fixed bed filled with dechlorinating agent, and the dechlorinating agent is a wide-temperature dechlorinating agent.

[0017] In an optional embodiment of the present invention, the deoxidation device is filled with a deoxidizing agent, which includes a noble metal deoxidizing agent or a non-noble metal deoxidizing agent. The deoxidizing agent reaction temperature is 80-120°C, and its space velocity is 3000-6000 h⁻¹. -1 .

[0018] In an optional embodiment of the present invention, the hydrolysis catalytic tower is provided with a feed port and a discharge port at the bottom, and is filled with a medium-temperature hydrolysis catalyst. The catalyst support is γ-Al2O3 or TiO2, the catalyst reaction temperature is 80-120℃, and the space velocity is 4000-10000 h⁻¹. -1 .

[0019] To achieve the above and other related objectives, the desulfurization system is equipped with a feed port and a discharge port at the bottom. It is filled with iron oxide desulfurizing agent, the reaction temperature of which is 30-110℃, and its space velocity is 1000-3000 h⁻¹. -1 .

[0020] In an optional embodiment of the present invention, the bypass pipeline is connected in parallel with the residual pressure turbine power generation device and the pressure regulating valve group. By adjusting the gas control valve, the gas flow ratio into the residual pressure turbine power generation device and the bypass pipeline is adjusted so that the temperature of the mixed gas is 90-100°C.

[0021] In an optional embodiment of the present invention, the temperature of the blast furnace gas after dust removal, dechlorination and deoxygenation is 130-180°C, and the temperature of the blast furnace gas after passing through the residual pressure turbine power generation device is 30-80°C. The gas control valve is introduced into the residual pressure turbine power generation device and the bypass pipeline in a ratio of 7:3, so that the temperature of the mixed gas is in the range of 90-100°C.

[0022] The technical effects of this invention are as follows:

[0023] This invention innovatively diverts and processes the deoxidized and dechlorinated blast furnace gas, using part of it for power generation in a residual pressure turbine power generation unit (hereinafter referred to as TRT), and retaining the heat in the original gas to increase the temperature of the gas after TRT. This allows the hydrolysis system to switch from a low-temperature hydrolysis catalyst to a medium-temperature hydrolysis catalyst, thereby effectively improving the hydrolysis catalytic efficiency.

[0024] This invention places the hydrolysis desulfurization system after the TRT, which reduces the corrosion and wear that acidic gases may cause to the TRT, extends the service life of the TRT blades and gas pipelines, and reduces the enterprise's production safety risks and operating costs.

[0025] This invention incorporates dechlorination and deoxygenation treatments before blast furnace gas desulfurization, which can significantly reduce the poisoning and deactivation of hydrolysis catalysts, extend catalyst life, and improve desulfurization efficiency.

[0026] The gas from the TRT power generation is mixed with bypass gas at a temperature range of 90-100℃. Since the condensation temperature of water vapor is 80℃, this invention can effectively reduce water precipitation, reduce pipeline corrosion, and improve the subsequent desulfurization effect. Attached Figure Description

[0027] Figure 1 This is an overall schematic diagram of the process method for fine desulfurization of blast furnace gas provided in the embodiments of the present invention.

[0028] Attached reference numerals: 1. Blast furnace gas; 2. Dry dust removal system; 3. Dechlorination unit; 4. Deoxygenation unit; 5. Gas control valve; 6. First gas flow meter; 7. Residual pressure turbine power generation unit; 8. Pressure reducing valve group; 9. Second gas flow meter; 10. Bypass pipeline; 11. Temperature display; 12. Hydrolysis catalytic tower; 13. Desulfurization system; 14. Blast furnace gas pipeline network. Detailed Implementation

[0029] The following specific examples illustrate the implementation of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that, unless otherwise specified, the following embodiments and features described therein can be combined with each other.

[0030] It should be noted that the illustrations provided in the following embodiments are only schematic representations of the basic concept of the present invention. Therefore, the illustrations only show the components related to the present invention and are not drawn according to the actual number, shape and size of the components in the actual implementation. In the actual implementation, the form, quantity and proportion of each component can be arbitrarily changed, and the layout of the components may also be more complex.

[0031] Please see Figure 1 As shown, the present invention provides a process for fine desulfurization of blast furnace gas, including blast furnace gas 1, dry dust removal system 2, dechlorination device 3, deoxygenation device 4, gas control valve 5, first gas flow meter 6, residual pressure turbine power generation device 7, pressure reducing valve group 8, second gas flow meter 9, bypass pipeline 10, temperature display 11, hydrolysis catalytic tower 12, desulfurization system 13 and blast furnace gas pipeline network 14;

[0032] Blast furnace gas 1 enters the dry dust removal system 2 through a pipeline. The dry dust removal system 2 is connected to one end of the dechlorination unit 3 through a pipeline. The other end of the dechlorination unit 3 is connected to the deoxygenation unit 4 through a pipeline. The deoxygenation unit 4 is connected to the gas control valve 5 through a pipeline. Blast furnace gas 1 is connected to the residual pressure turbine power generation unit 7 and the pressure regulating valve group 8 through the control valve 5. Partially retaining the heat in the original gas, this increases the temperature of the gas after passing through the residual pressure turbine power generation unit 7 (TRT), causing the hydrolysis system to switch from a low-temperature hydrolysis catalyst to a medium-temperature hydrolysis catalyst, thereby effectively improving the hydrolysis catalytic efficiency. Furthermore, blast furnace gas 1 is connected to one end of the bypass pipeline 10 through the control valve 5. The other end of the bypass pipeline 10 is connected to the hydrolysis catalytic tower 12. The residual pressure turbine power generation unit 7 is connected to one end of the hydrolysis catalytic tower 12 through a temperature display 11. The other end of the hydrolysis catalytic tower 12 is connected to one end of the blast furnace gas desulfurization system 13. The other end of the blast furnace gas desulfurization system 13 is connected to the blast furnace gas pipeline network 14.

[0033] In an optional embodiment of the present invention, a first gas flow meter 6 is disposed between the gas control valve 5 and the residual pressure turbine power generation device 7 and the pressure regulating valve group 8.

[0034] In an optional embodiment of the present invention, a second gas flow meter 9 is disposed between the control valve 5 and the bypass pipe 10.

[0035] In an optional embodiment of the present invention, a temperature display 11 is provided between the bypass pipe 10 and the hydrolysis catalytic tower 12.

[0036] In an optional embodiment of the present invention, the dechlorination device 3 is a fixed bed filled with dechlorinating agent, and the dechlorinating agent is a wide-temperature dechlorinating agent.

[0037] In an optional embodiment of the present invention, the deoxidation device 4 is filled with a deoxidizing agent, which includes a noble metal deoxidizing agent or a non-noble metal deoxidizing agent. The deoxidizing agent reaction temperature is 80-120°C, and its space velocity is 3000-6000 h⁻¹. -1 .

[0038] In an optional embodiment of the present invention, the hydrolysis catalytic tower 12 is provided with a feed port and a discharge port at the bottom, and is filled with a medium-temperature hydrolysis catalyst. The catalyst support is γ-Al2O3 or TiO2, the catalyst reaction temperature is 80-120℃, and the space velocity is 4000-10000 h⁻¹. -1 .

[0039] In an optional embodiment of the present invention, the desulfurization system 13 is provided with a feed port and a discharge port at the bottom, and is filled with iron oxide desulfurizing agent. The reaction temperature of the desulfurizing agent is 30-110°C, and its space velocity is 1000-3000 h⁻¹. -1 .

[0040] In an optional embodiment of the present invention, the bypass pipe 10 is connected in parallel with the residual pressure turbine power generation device 7 and the pressure regulating valve group 8. By adjusting the gas control valve 5, the gas flow ratio into the residual pressure turbine power generation device 7 and the bypass pipe 10 is adjusted so that the temperature of the mixed gas is 90-100°C.

[0041] In an optional embodiment of the present invention, the temperature of blast furnace gas 1 after dust removal, dechlorination and deoxygenation is 130-180°C. The temperature of blast furnace gas 1 after passing through the residual pressure turbine power generation device 7 is 30-80°C. The gas control valve 5 is introduced into the residual pressure turbine power generation device 7 and the bypass pipeline 10 in a ratio of 7:3, so that the temperature of the mixed gas is in the range of 90-100°C.

[0042] S1: Blast furnace gas 1, after passing through dry dust removal system 2, is fed into dechlorination unit 3 to remove Cl from the gas. - ;

[0043] S2: The blast furnace gas after dechlorination by the dechlorination unit 3 is transported to the deoxidation unit 4. After deoxidation, the oxygen volume content of the gas is 0.1-0.3%.

[0044] S3: The temperature of the deoxidized blast furnace gas is 130-180℃. By adjusting the gas control valve 5, 70% of the gas enters the residual pressure turbine power generation unit 7 and the pressure reducing valve group 8. After passing through the residual pressure turbine power generation unit 7, the gas temperature is 30-80℃. 30% of the gas passes through the bypass pipeline 10 and merges with the gas discharged from the residual pressure turbine power generation unit 7 in the main pipeline. After merging, the gas temperature is adjusted to 90-100℃ by adjusting the gas control valve 5. Gas flow meters are installed on both pipelines to monitor and adjust the gas ratio.

[0045] S4: The mixed blast furnace gas enters the hydrolysis catalytic tower 12, where COS in the gas is converted into H2S by a medium-temperature hydrolysis catalyst.

[0046] S5: The hydrolyzed blast furnace gas enters the desulfurization system 13, where H2S is removed under the catalytic action of iron oxide, and then it is transmitted to each user through the blast furnace gas pipeline network 14.

[0047] The present invention places the hydrolysis catalytic tower 12 and the desulfurization system 13 after the residual pressure turbine power generation unit 7, which reduces the corrosion and wear that acidic gases may cause to the residual pressure turbine power generation unit 7, extends the service life of the blades and gas pipelines of the residual pressure turbine power generation unit 7, and reduces the enterprise's production safety risks and operating costs.

[0048] The present invention sets up a dechlorination device 3 and a deoxygenation device 4 before the desulfurization of blast furnace gas, which can greatly reduce the poisoning and deactivation of hydrolysis catalyst, extend catalyst life, and improve desulfurization effect.

[0049] After the gas generated by the residual pressure turbine power generation device 7 is mixed with the bypass gas, the temperature range is 90-100℃. Since the water vapor condensation temperature is 80℃, it can effectively reduce water precipitation, reduce pipeline corrosion, and improve the subsequent desulfurization effect.

[0050] The above embodiments are merely illustrative of the principles and effects of the present invention and are not intended to limit the invention. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in the present invention should still be covered by the claims of the present invention.

[0051] Throughout this description, numerous specific details, such as examples of components and / or methods, are provided to provide a complete understanding of embodiments of the invention. However, those skilled in the art will recognize that embodiments of the invention may be practiced without one or more of these specific details or by other devices, systems, components, methods, parts, materials, components, etc. In other instances, well-known structures, materials, or operations have not been specifically shown or described in detail to avoid obscuring aspects of embodiments of the invention.

[0052] Throughout this specification, references to "an embodiment," "an embodiment," or "a specific embodiment" mean that a particular feature, structure, or characteristic described in connection with an embodiment is included in at least one embodiment of the invention, but not necessarily in all embodiments. Therefore, the various representations of the phrases "in one embodiment," "in an embodiment," or "in a specific embodiment" in different places throughout the specification do not necessarily refer to the same embodiment. Furthermore, a particular feature, structure, or characteristic of any specific embodiment of the invention can be combined with one or more other embodiments in any suitable manner. It should be understood that other variations and modifications of the invention and the embodiments shown herein may be based on the teachings herein and will be considered part of the spirit and scope of the invention.

[0053] It should also be understood that one or more of the elements shown in the figures may be implemented in a more separate or more integrated manner, or may even be removed because they are inoperable in certain circumstances or provided because they may be useful for a particular application.

[0054] Furthermore, unless otherwise expressly stated, any arrows in the accompanying drawings should be considered illustrative only and not limiting. Additionally, unless otherwise stated, the term "or" as used herein is generally intended to mean "and / or". Where a term is anticipated to provide a separation or combination capability that is unclear, a combination of components or steps will also be considered as indicated.

[0055] As used herein and throughout the claims below, unless otherwise specified, “a” and “the” include the plural references. Similarly, as used herein and throughout the claims below, unless otherwise specified, “in” means “in” and “on”.

[0056] The above description of the embodiments shown in this invention (including the content in the specification summary) is not intended to be exhaustive or to limit the invention to the precise forms disclosed herein. Although specific embodiments and examples of the invention have been described herein for illustrative purposes only, various equivalent modifications are possible within the spirit and scope of the invention, as will be recognized and understood by those skilled in the art. As indicated, these modifications can be made to the invention in accordance with the above description of the embodiments, and such modifications will be within the spirit and scope of the invention.

[0057] This document has generally described the systems and methods in detail to aid in understanding the invention. Furthermore, various specific details have been set forth to provide a general understanding of embodiments of the invention. However, those skilled in the art will recognize that embodiments of the invention can be practiced without one or more specific details, or using other means, systems, accessories, methods, components, materials, parts, etc. In other instances, well-known structures, materials, and / or operations have not been specifically shown or described in detail to avoid obscuring aspects of embodiments of the invention.

[0058] Therefore, although the invention has been described herein with reference to specific embodiments thereof, freedom of modification, various changes and substitutions are also within the scope of the foregoing disclosure, and it should be understood that in some cases, certain features of the invention may be adopted without departing from the scope and spirit of the invention and without corresponding use of other features. Thus, many modifications can be made to adapt a particular environment or material to the essential scope and spirit of the invention. The invention is not intended to be limited to the specific terminology used in the following claims and / or the specific embodiments disclosed as the best mode for carrying out the invention, but the invention will include any and all embodiments and equivalents falling within the scope of the appended claims. Therefore, the scope of the invention will be defined only by the appended claims.

Claims

1. A process for fine desulphurization of blast furnace gas, characterized in that, It comprises the following steps: S1: The blast furnace gas (1) is input into the dechlorination device (3) after passing through the dry dedusting system (2), and the Cl in the gas is removed - ; S2: the dechlorination device (3) transports the dechlorinated blast furnace gas to the deoxidation device (4), and the oxygen volume content of the gas after deoxidation treatment is 0.1-0.3%; S3: the temperature of the deoxidized blast furnace gas is 130-180℃, 70% of the gas enters the excess pressure turbine power generation device (7) and the pressure reducing valve group (8) by adjusting the gas control valve (5), and the temperature of the gas after the excess pressure turbine power generation device (7) is 30-80℃; 30% of the gas passes through the bypass pipeline (10) and is combined with the gas discharged from the excess pressure turbine power generation device (7) in the main pipeline, and the temperature of the combined gas is adjusted to 90-100℃ by adjusting the gas control valve (5), and the gas flow meters are arranged in the two pipelines respectively for monitoring and adjusting the gas ratio; S4: the mixed blast furnace gas enters the hydrolysis catalyst tower (12), and the COS in the gas is catalytically converted into H2S by a medium-temperature hydrolysis catalyst; S5: the hydrolyzed blast furnace gas enters the desulfurization system (13), H2S is removed under the catalysis of iron oxide, and then is transmitted to each user through the blast furnace gas pipeline network (14).

2. The process for fine desulphurization of blast furnace gas as claimed in claim 1 wherein, It also comprises a first gas flow meter (6), the blast furnace gas (1) enters the dry dedusting system (2) through a pipeline, the dry dedusting system (2) is connected to one end of the dechlorination device (3) through a pipeline, the other end of the dechlorination device (3) is connected to the deoxidation device (4) through a pipeline, the deoxidation device (4) is connected to the gas control valve (5) through a pipeline, the blast furnace gas (1) is connected to the excess pressure turbine power generation device (7) and the pressure regulating valve group (8) through the control valve (5), and the blast furnace gas (1) is connected to one end of the bypass pipeline (10) through the control valve (5), the other end of the bypass pipeline (10) is connected to the hydrolysis catalyst tower (12), one end of the excess pressure turbine power generation device (7) is connected to one end of the hydrolysis catalyst tower (12) through a temperature display (11), the other end of the hydrolysis catalyst tower (12) is connected to one end of the blast furnace gas desulfurization system (13), and the other end of the blast furnace gas desulfurization system (13) is connected to the blast furnace gas pipeline network (14). The first gas flow meter (6) is arranged between the gas control valve (5) and the excess pressure turbine power generation device (7) and the pressure regulating valve group (8).

3. The process for fine desulphurization of blast furnace gas as claimed in claim 1 wherein, It also comprises a second gas flow meter (9), which is arranged between the control valve (5) and the bypass pipeline (10).

4. The process for fine desulphurization of blast furnace gas as claimed in claim 1 wherein, A temperature display (11) is arranged between the bypass pipeline (10) and the hydrolysis catalyst tower (12).

5. The process for fine desulphurization of blast furnace gas as claimed in claim 4 wherein, The dechlorination device (3) is a fixed bed filled with dechlorination agents, and the dechlorination agents are wide-temperature dechlorination agents.

6. The process for fine desulphurization of blast furnace gas as claimed in claim 1 wherein, The deoxidizing device (4) is filled with deoxidizing agent, the deoxidizing agent includes noble metal deoxidizing agent or non-noble metal deoxidizing agent, the deoxidizing agent reaction temperature is 80-120 DEG C, and the space velocity is 3000-6000h -1 .

7. The process for fine desulphurization of blast furnace gas as claimed in claim 1 wherein, The hydrolysis catalytic tower (12) is provided with a feeding port and a discharging port at the bottom, and is filled with medium-temperature hydrolysis catalysts inside, the catalyst carrier is γ-Al2O3 or TiO2, the catalyst reaction temperature is 80-120℃, and the space velocity is 4000-10000h -1 .

8. The process for fine desulphurization of blast furnace gas as claimed in claim 1 wherein, The desulfurization system (13) bottom is equipped with feeding port and discharge port, its inside fills iron oxide desulfurizer, the desulfurizer reaction temperature is 30-110 ℃, its space velocity is 1000-3000 h -1 .

9. The process for fine desulphurization of blast furnace gas as claimed in claim 1 wherein: The bypass pipeline (10) is connected in parallel with the excess pressure turbine power generation device (7) and the pressure regulating valve group (8), the gas flow ratio entering the excess pressure turbine power generation device (7) and the bypass pipeline (10) is adjusted by adjusting the gas control valve (5), and the temperature of the mixed gas is 90-100℃.

10. The process for fine desulphurization of blast furnace gas as claimed in claim 1 wherein, The blast furnace gas (1) is de-dusted, de-chlorinated and de-oxygenated, and the temperature is 130-180 DEG C, the blast furnace gas (1) is passed through the residual pressure turbine power generation device (7), and the temperature is 30-80 DEG C, the coal gas control valve (5) is passed through the residual pressure turbine power generation device (7) and the bypass pipeline (10) according to the proportion of 7:3, and the temperature of the mixed gas is in the range of 90-100 DEG C.

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