A blast furnace gas fine desulfurization system and method

Abstract

The present invention relates to the technical field of coal gas desulfurization, and more particularly to a blast furnace gas fine desulfurization system and method. The system comprises: a catalytic hydrolysis system and a scrubbing tower, wherein the catalytic hydrolysis system is connected to the scrubbing tower; the catalytic hydrolysis system is used to catalytically hydrolyze the blast furnace gas; and the scrubbing tower is used to finely desulfurize the blast furnace gas after the catalytic hydrolysis to obtain desulfurized blast furnace gas, which is then discharged through a gas outlet at the top of the scrubbing tower. The system improves the processing efficiency of the fine desulfurization of blast furnace gas, prevents blast furnace gas from corroding pipelines and equipment, reduces production pollution, and saves costs.

Description

Technical Field

[0001] The present invention relates to the technical field of coal gas desulfurization, and in particular to a blast furnace coal gas fine desulfurization system and method. Background Art

[0002] The steel and metallurgical industry is a key foundational sector of my country's heavy industry, yet it is also highly polluting, energy-intensive, and has a complex industrial structure. Blast furnace gas (BFG) is a high-temperature, high-pressure, flammable, and explosive gas. It also contains a high sulfide content and small amounts of chlorides, causing severe corrosion to BFG pipelines and equipment. Furthermore, it fails to meet national ultra-low emission standards for the steel industry, significantly harming the environment. Currently, BFG fine desulfurization systems suffer from low treatment efficiency, resulting in poor removal of sulfides from BFG. Summary of the Invention

[0003] The embodiments of the present application solve the technical problem of low processing efficiency of blast furnace gas fine desulfurization in the prior art by providing a blast furnace gas fine desulfurization system and method, thereby achieving the technical effects of improving the processing efficiency of blast furnace gas fine desulfurization, preventing blast furnace gas from corroding pipelines and equipment, reducing production pollution, and saving costs.

[0004] In a first aspect, an embodiment of the present invention provides a blast furnace gas fine desulfurization system, comprising: a catalytic hydrolysis system and a cleaning tower, wherein the catalytic hydrolysis system is connected to the cleaning tower;

[0005] The catalytic hydrolysis system is used to perform catalytic hydrolysis treatment on blast furnace gas;

[0006] The cleaning tower is used to carry out fine desulfurization treatment on the blast furnace gas after catalytic hydrolysis to obtain desulfurized blast furnace gas, and discharge the desulfurized blast furnace gas through the gas outlet at the top of the cleaning tower.

[0007] Preferably, the system further comprises: a blast furnace gas waste pressure turbine power generation TRT system,

[0008] The TRT system is arranged on the pipeline connecting the catalytic hydrolysis system and the cleaning tower, and is used to transmit the blast furnace gas after the catalytic hydrolysis to the air inlet at the bottom of the cleaning tower.

[0009] Preferably, the cleaning tower comprises: an air distribution grid, a circulating alkali water nozzle and an alkali liquid nozzle arranged from bottom to top in the cleaning tower;

[0010] The gas distribution grid is used to evenly distribute the blast furnace gas after the catalytic hydrolysis;

[0011] The circulating alkali water nozzle is used to carry out fine desulfurization treatment on the blast furnace gas after the catalytic hydrolysis by spraying the circulating alkali water;

[0012] The alkali solution spray head is used to perform fine desulfurization treatment on the blast furnace gas after fine desulfurization treatment by spraying alkali solution water.

[0013] Preferably, the cleaning tower further comprises: a demister,

[0014] The demister is arranged in the cleaning tower and above the alkali solution nozzle.

[0015] Preferably, the cleaning tower further comprises: a production water nozzle;

[0016] The production water nozzle is arranged in the cleaning tower and above the demister, and is used for flushing the demister.

[0017] Preferably, the system further comprises: a gas pipeline nozzle,

[0018] The gas pipeline nozzle is arranged on the pipeline connecting the TRT system and the cleaning tower, and is used for desulfurization pretreatment of the blast furnace gas after catalytic hydrolysis by spraying the circulating alkaline water.

[0019] Preferably, the system further comprises: a circulating alkali solution pool and a circulating alkali solution pump;

[0020] The water inlet of the circulating alkali liquid pool is connected to the bottom of the cleaning tower and is used to collect the alkali liquid water flowing out of the cleaning tower; the water outlet of the circulating alkali liquid pool is connected to the gas pipeline nozzle and the circulating alkali liquid water nozzle through the circulating alkali liquid water pump;

[0021] The circulating alkali liquid water pump is used to transmit the circulating alkali liquid water drawn from the circulating alkali liquid water pool to the gas pipeline nozzle and the circulating alkali liquid water nozzle.

[0022] Preferably, the system further comprises: an alkali solution tank, an alkali solution pump, a soft water tank and an alkali solution dilution pump;

[0023] The alkali liquid tank is connected to the outlet pipe of the alkali liquid dilution pump through the alkali liquid pump and is used to store the alkali liquid;

[0024] The soft water tank is connected to the water inlet pipe of the alkali solution dilution pump;

[0025] The water outlet pipe of the alkali solution dilution pump is connected to the alkali solution nozzle and is used for extracting soft water from the soft water pool to dilute the alkali solution with the soft water and transmit the diluted alkali solution to the alkali solution nozzle.

[0026] Preferably, the system further comprises: a production water pool and a production water pump; the production water pool is connected to the production water nozzle via the production water pump.

[0027] Based on the same inventive concept, in a second aspect, the present invention further provides a method for fine desulfurization of blast furnace gas, comprising:

[0028] After controlling the blast furnace gas to pass through the catalytic hydrolysis system, catalytically hydrolyzed blast furnace gas is obtained;

[0029] The blast furnace gas after the catalytic hydrolysis is subjected to fine desulfurization treatment through a cleaning tower; wherein the cleaning tower is connected to the catalytic hydrolysis system;

[0030] After the fine desulfurization treatment, the desulfurized blast furnace gas is released.

[0031] One or more technical solutions in the embodiments of the present invention have at least the following technical effects or advantages:

[0032] In the embodiments of the present application, a catalytic hydrolysis system is used to catalytically hydrolyze blast furnace gas to produce catalytically hydrolyzed blast furnace gas, which is then transferred to a scrubber. The scrubber then performs fine desulfurization on the catalytically hydrolyzed blast furnace gas to produce desulfurized blast furnace gas, which is then discharged through the outlet at the top of the scrubber. This system improves the efficiency of fine desulfurization of blast furnace gas, prevents corrosion of pipelines and equipment by blast furnace gas that has not undergone fine desulfurization, reduces production pollution, and saves costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Various other advantages and benefits will become apparent to those skilled in the art upon reading the detailed description of the preferred embodiment below. The accompanying drawings are for illustration purposes only and are not to be considered as limiting the present invention. Throughout the drawings, the same reference figures denote the same components. In the drawings:

[0034] Figure 1 A schematic structural diagram of a blast furnace gas fine desulfurization system according to an embodiment of the present invention is shown;

[0035] Figure 2 A schematic flow chart of the steps of a blast furnace gas fine desulfurization method according to an embodiment of the present invention is shown. DETAILED DESCRIPTION

[0036] Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although exemplary embodiments of the present disclosure are shown in the accompanying drawings, it should be understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments set forth herein. Rather, these embodiments are provided to enable a more thorough understanding of the present disclosure and to fully convey the scope of the present disclosure to those skilled in the art.

[0037] Example 1

[0038] The first embodiment of the present invention provides a blast furnace gas fine desulfurization system, such as Figure 1 As shown, it includes: a catalytic hydrolysis system 101 and a cleaning tower 102, and the catalytic hydrolysis system 101 is connected to the cleaning tower 102;

[0039] The catalytic hydrolysis system 101 is used to catalytically hydrolyze blast furnace gas;

[0040] The cleaning tower 102 is used to perform fine desulfurization treatment on the blast furnace gas after catalytic hydrolysis to obtain desulfurized blast furnace gas, and discharge the desulfurized blast furnace gas through the gas outlet at the top of the cleaning tower 102.

[0041] It should be noted that, through the catalytic hydrolysis system 101 , the blast furnace gas is catalytically hydrolyzed to generate catalytically hydrolyzed blast furnace gas, which contains about 90% hydrogen sulfide and the remaining blast furnace gas.

[0042] In this embodiment, catalytic hydrolysis system 101 catalytically hydrolyzes blast furnace gas to produce catalytically hydrolyzed blast furnace gas, which is then transferred to scrubbing tower 102. Scrubbing tower 102 then performs fine desulfurization on the catalytically hydrolyzed blast furnace gas to produce desulfurized blast furnace gas, which is then discharged through the outlet at the top of scrubbing tower 102. This system improves the efficiency of fine desulfurization of blast furnace gas, prevents corrosion of pipelines and equipment by blast furnace gas that has not undergone fine desulfurization, reduces production pollution, and saves costs.

[0043] The system also includes a blast furnace gas recovery turbine (TRT) system (Blast Furnace Top Gas Recovery Turbine Unit) 103. The TRT system 103 is installed on the pipeline connecting the catalytic hydrolysis system 101 and the scrubbing tower 102 and is used to transmit the catalytically hydrolyzed blast furnace gas to the air inlet at the bottom of the scrubbing tower 102.

[0044] The TRT system 103 not only provides the driving force for the transmission of blast furnace gas after catalytic hydrolysis, but also converts the pressure energy and thermal energy of the blast furnace gas into electrical energy, reflecting the advantages of environmental protection, low energy consumption and low cost.

[0045] The system further includes a gas pipeline nozzle 104. The gas pipeline nozzle 104 is provided on the pipeline connecting the TRT system 103 and the cleaning tower 102, and is used to perform desulfurization pretreatment on the blast furnace gas after catalytic hydrolysis by spraying circulating alkaline water.

[0046] The gas pipeline nozzle 104 is provided to pre-react the blast furnace gas after catalytic hydrolysis, initially remove a portion of sulfides, and then allow the blast furnace gas after catalytic hydrolysis to enter the cleaning tower 102 to wait for entering the fine desulfurization process.

[0047] After catalytic hydrolysis, the blast furnace gas enters the air inlet at the bottom of the cleaning tower 102 and gradually rises. During the rise, it reacts with substances sprayed by the relevant equipment installed in the cleaning tower 102 from bottom to top, achieving the effect of fine desulfurization of the blast furnace gas.

[0048] It should also be noted that the blast furnace gas fine desulfurization system also includes a nitrogen plant 114. This plant is connected to the pipeline connecting the TRT system 103 and the scrubber 102, and is also connected to the outlet pipe of the alkali dilution pump. Nitrogen plant 114 is connected to the pipeline connecting the TRT system 103 and the scrubber 102. Nitrogen plant 114 is used to deliver nitrogen to the pipeline connecting the catalytic hydrolysis system 101 and the scrubber 102, thereby increasing the reaction area between the catalytically hydrolyzed blast furnace gas and the circulating alkali water, allowing the catalytically hydrolyzed blast furnace gas to fully react with the circulating alkali water sprayed through the gas pipeline nozzle 104.

[0049] Next, the relevant equipment in the cleaning tower 102 is introduced:

[0050] The cleaning tower 102 of this embodiment includes: an air distribution grid 1021, a circulating alkali water nozzle 1022, an alkali nozzle 1023, a demister 1024 and a production water nozzle 1025, which are arranged in sequence from bottom to top in the cleaning tower 102.

[0051] Gas distribution grid 1021 is used to evenly distribute the catalytically hydrolyzed blast furnace gas entering from the air inlet at the bottom of scrubber 102. This grid is designed to evenly distribute the blast furnace gas, increase its reaction area, and ensure sufficient fine desulfurization of the blast furnace gas.

[0052] Circulating alkali water nozzle 1022 is used to perform fine desulfurization on blast furnace gas after catalytic hydrolysis by spraying circulating alkali water. The circulating alkali water sprayed by circulating alkali water nozzle 1022 performs a fine desulfurization reaction on the blast furnace gas after catalytic hydrolysis, removing most of the sulfides in the blast furnace gas after catalytic hydrolysis. Furthermore, the circulating alkali water is recycled. Using reusable circulating alkali water not only saves costs and reduces energy consumption, but also improves the efficiency of fine desulfurization of blast furnace gas after catalytic hydrolysis, reducing production pollution.

[0053] The alkali spray nozzle 1023 is used to perform a further fine desulfurization on the blast furnace gas after fine desulfurization by spraying alkali water. The alkali water sprayed by the alkali spray nozzle 1023 is fresh alkali water, which performs a further fine desulfurization reaction on the blast furnace gas after catalytic hydrolysis. This removes the final sulfides in the catalytic hydrolysis blast furnace gas, ensuring the effectiveness of fine desulfurization of the blast furnace gas and improving its treatment efficiency. Furthermore, the fresh alkali water used becomes recycled alkali water, saving costs and energy.

[0054] Demister 1024, located within cleaning tower 102 and above alkali solution nozzle 1023, is used to remove mist from cleaning tower 102. Fine desulfurization of catalytically hydrolyzed blast furnace gas produces mist particles. Demister 1024 is required to prevent these mist particles from being emitted with the desulfurized blast furnace gas, ensuring the cleanliness of the desulfurized blast furnace gas.

[0055] The production water nozzle 1025 is provided in the cleaning tower 102 above the demister 1024 and is used to spray production water to flush the demister 1024. The production water nozzle 1025 is provided to clear the demister 1024, prevent the demister 1024 from being blocked, and ensure the demisting effect of the demister 1024.

[0056] The various related equipment in the cleaning tower 102 have been introduced. Next, it is necessary to introduce the equipment connected to the related equipment in the cleaning tower 102.

[0057] The system of this embodiment further includes a circulating alkali water tank 105 and a circulating alkali water pump 106. The water inlet of the circulating alkali water tank 105 is connected to the bottom of the cleaning tower 102 to collect the alkali water flowing out of the cleaning tower 102. The water outlet of the circulating alkali water tank 105 is connected to the gas pipeline nozzle 104 and the circulating alkali water nozzle 1022 via the circulating alkali water pump 106. The circulating alkali water tank 105 collects the circulating alkali water from the fine desulfurization process and the fresh alkali water from the secondary fine desulfurization process. The liquid in the circulating alkali water tank 105 is collectively referred to as the circulating alkali water.

[0058] The circulating alkali water pump 106 is provided on the pipe connecting the circulating alkali water pool 105 and the gas pipeline nozzle 104 , and is used to transfer the circulating alkali water extracted from the circulating alkali water pool 105 to the gas pipeline nozzle 104 and the circulating alkali water nozzle 1022 .

[0059] The system of this embodiment further includes: an alkali solution tank 107, an alkali solution pump 108, a soft water tank 109 and an alkali solution dilution pump 110;

[0060] The alkali liquid tank 107 is used to store high-concentration alkali liquid. The alkali liquid tank 107 is connected to the outlet pipe of the alkali liquid dilution pump 110 through the alkali liquid pump 108, indicating that the alkali liquid tank 107 is pumped with high-concentration alkali liquid to the outlet pipe of the alkali liquid dilution pump 110 by the alkali liquid pump 108.

[0061] The soft water tank 109 is used to store soft water and is connected to the water inlet pipe of the alkali solution dilution pump 110.

[0062] The outlet pipe of the alkali solution dilution pump 110 is connected to the alkali solution nozzle 1023 and is used to extract soft water from the soft water tank 109 through the alkali solution dilution pump 110 to dilute the high-concentration alkali solution with the soft water and transmit the diluted alkali solution to the alkali solution nozzle 1023.

[0063] It should also be noted that the nitrogen equipment 114 is also connected to the water outlet pipe of the alkali solution dilution pump 110, and is used to add some nitrogen to the diluted alkali solution to make the water mist sprayed by the alkali solution nozzle 1023 more uniform and fine, which is conducive to the removal reaction.

[0064] The system of this embodiment further includes: a production water pool 111 and a production water pump 112 ; the production water pool 111 is connected to the production water nozzle 1025 via the production water pump 112 .

[0065] The system of this embodiment further includes a wastewater pool 113 , which is connected to the bottom of the cleaning tower 102 and is used to collect wastewater discharged from the cleaning tower 102 , including substances such as used alkali water.

[0066] One or more technical solutions in the embodiments of the present invention have at least the following technical effects or advantages:

[0067] In this embodiment, the catalytic hydrolysis system catalytically hydrolyzes blast furnace gas to produce catalytically hydrolyzed blast furnace gas, which is then transferred to a scrubber. The scrubber then undergoes fine desulfurization to produce desulfurized blast furnace gas, which is then discharged through an outlet at the top of the scrubber. This system improves the efficiency of fine desulfurization of blast furnace gas, prevents corrosion of pipelines and equipment by undesulfurized blast furnace gas, reduces production pollution, and saves costs.

[0068] Example 2

[0069] Based on the same inventive concept, the second embodiment of the present invention also provides a blast furnace gas fine desulfurization method, such as Figure 2 As shown, including:

[0070] S201, after controlling the blast furnace gas to pass through the catalytic hydrolysis system 101, obtaining catalytically hydrolyzed blast furnace gas;

[0071] S202, performing fine desulfurization treatment on the blast furnace gas after catalytic hydrolysis through the cleaning tower 102; wherein the cleaning tower 102 is connected to the catalytic hydrolysis system 101;

[0072] S203, after fine desulfurization treatment, the desulfurized blast furnace gas is released.

[0073] As an optional embodiment, after obtaining the catalytically hydrolyzed blast furnace gas, the method further includes:

[0074] The blast furnace gas after catalytic hydrolysis is transmitted to the air inlet at the bottom of the cleaning tower 102 through the TRT system 103; wherein the TRT system 103 is arranged on the pipeline connecting the catalytic hydrolysis system 101 and the cleaning tower 102.

[0075] As an optional embodiment, the fine desulfurization treatment of the blast furnace gas after catalytic hydrolysis includes:

[0076] First, the blast furnace gas after the catalytic hydrolysis is evenly distributed through the gas distribution grid 1021; then, circulating alkali water is sprayed through the circulating alkali water nozzle 1022 to perform fine desulfurization treatment on the blast furnace gas after the catalytic hydrolysis; then, alkali water is sprayed through the alkali liquid nozzle 1023 to perform fine desulfurization treatment on the blast furnace gas after the fine desulfurization treatment again; wherein, the cleaning tower 102 includes: a gas distribution grid 1021, a circulating alkali liquid water nozzle 1022 and an alkali liquid nozzle 1023 arranged from bottom to top in the cleaning tower 102.

[0077] As an optional embodiment, the fine desulfurization treatment of the blast furnace gas after catalytic hydrolysis includes:

[0078] The mist in the cleaning tower 102 is removed by the demister 1024 ; wherein the demister 1024 is arranged in the cleaning tower 102 and above the alkali solution nozzle 1023 .

[0079] As an optional embodiment, the fine desulfurization treatment of the blast furnace gas after catalytic hydrolysis includes:

[0080] The demister 1024 is flushed through a production water nozzle 1025 ; wherein the production water nozzle 1025 is arranged in the cleaning tower 102 and above the demister 1024 .

[0081] As an optional embodiment, the step of transmitting the catalytically hydrolyzed blast furnace gas to the gas inlet at the bottom of the cleaning tower 102 includes:

[0082] The circulating alkaline water is sprayed through a gas pipeline nozzle 104 to perform desulfurization pretreatment on the blast furnace gas after catalytic hydrolysis; wherein the gas pipeline nozzle 104 is set on the pipeline connecting the TRT system 103 and the cleaning tower 102.

[0083] As an optional embodiment, the fine desulfurization treatment of the blast furnace gas after catalytic hydrolysis includes:

[0084] The alkaline liquid water flowing out of the cleaning tower 102 is collected by a circulating alkaline liquid water pool 105; wherein the water inlet of the circulating alkaline liquid water pool 105 is connected to the bottom of the cleaning tower 102;

[0085] The circulating alkali water is extracted from the circulating alkali water pool 105 through the circulating alkali water pump 106 and transmitted to the gas pipeline nozzle 104 and the circulating alkali water nozzle 1022; wherein, the water outlet of the circulating alkali water pool 105 is connected to the gas pipeline nozzle 104 and the circulating alkali water nozzle 1022 through the circulating alkali water pump 106.

[0086] As an optional embodiment, the fine desulfurization treatment of the blast furnace gas after catalytic hydrolysis includes:

[0087] When the soft water in the soft water tank 109 is extracted by the alkali dilution pump 110, the alkali stored in the alkali tank 107 is extracted by the alkali pump 108;

[0088] After controlling the soft water to dilute the alkali solution, the diluted alkali solution is transferred to the alkali solution nozzle 1023; wherein, the alkali solution tank 107 is connected to the outlet pipe of the alkali solution dilution pump 110 through the alkali solution pump 108, and the soft water tank 109 is connected to the water inlet pipe of the alkali solution dilution pump 110; the outlet pipe of the alkali solution dilution pump 110 is connected to the alkali solution nozzle 1023.

[0089] As an optional embodiment, the fine desulfurization treatment of the blast furnace gas after catalytic hydrolysis includes:

[0090] The production water extracted from the production water pool 111 is delivered to the production water nozzle 1025 via the production water pump 112 ; wherein the production water pool 111 is connected to the production water nozzle 1025 via the production water pump 112 .

[0091] Since the blast furnace gas fine desulfurization method introduced in this embodiment is the method adopted for implementing the blast furnace gas fine desulfurization system in Example 1 of this application, based on the blast furnace gas fine desulfurization system introduced in Example 1 of this application, those skilled in the art can understand the specific implementation methods and various variations of the blast furnace gas fine desulfurization method of this embodiment, so how the blast furnace gas fine desulfurization method implements the system in Example 1 of this application will not be described in detail here. As long as those skilled in the art implement the method adopted by the blast furnace gas fine desulfurization system in Example 1 of this application, it falls within the scope of protection to be provided by this application.

[0092] It will be understood by those skilled in the art that embodiments of the present invention may be provided as methods, systems, or computer program products. Thus, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment, or an embodiment combining software and hardware. Furthermore, the present invention may take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to magnetic disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0093] The present invention is described with reference to flowcharts and / or block diagrams of methods, devices (systems), and computer program products according to embodiments of the present invention. It should be understood that each process and / or block in the flowcharts and / or block diagrams, as well as combinations of processes and / or blocks in the flowcharts and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowcharts and / or block diagrams. Figure 1 a process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0094] These computer program instructions may also be stored in a computer readable memory that can direct a computer or other programmable data processing device to work in a specific manner, so that the instructions stored in the computer readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 a process or multiple processes and / or boxes Figure 1 The function specified in one or more boxes.

[0095] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operational steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing the instructions executed on the computer or other programmable device for implementing the process. Figure 1 a process or multiple processes and / or boxes Figure 1 A step that specifies a function in one or more boxes.

[0096] Although the preferred embodiments of the present invention have been described, those skilled in the art may make additional changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications that fall within the scope of the present invention.

[0097] Obviously, those skilled in the art may make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if such changes and modifications fall within the scope of the claims and their equivalents, the present invention is intended to include such changes and modifications.

Claims

1. A blast furnace gas fine desulfurization system, characterized in that: include: A catalytic hydrolysis system and a cleaning tower, wherein the catalytic hydrolysis system is connected to the cleaning tower; The catalytic hydrolysis system is used to perform catalytic hydrolysis treatment on blast furnace gas; The cleaning tower is used to perform fine desulfurization on the blast furnace gas after catalytic hydrolysis to obtain desulfurized blast furnace gas, and discharge the desulfurized blast furnace gas through the gas outlet at the top of the cleaning tower; The system also includes: a blast furnace gas waste pressure turbine power generation TRT system, The TRT system is provided on the pipeline connecting the catalytic hydrolysis system and the cleaning tower, and is used to transmit the blast furnace gas after the catalytic hydrolysis to the air inlet at the bottom of the cleaning tower; The cleaning tower comprises: an air distribution grid, a circulating alkali water nozzle and an alkali liquid nozzle arranged from bottom to top in the cleaning tower; The gas distribution grid is used to evenly distribute the blast furnace gas after the catalytic hydrolysis; The circulating alkali water nozzle is used to carry out fine desulfurization treatment on the blast furnace gas after the catalytic hydrolysis by spraying the circulating alkali water; The alkali liquid spray head is used to perform fine desulfurization treatment on the blast furnace gas after fine desulfurization treatment by spraying alkali liquid water; The system also includes: a gas pipeline nozzle, The gas pipeline nozzle is provided on the pipeline connecting the TRT system and the cleaning tower, and is used to perform desulfurization pretreatment on the blast furnace gas after the catalytic hydrolysis by spraying the circulating alkaline water; The system also includes: a lye tank, a lye pump, a soft water tank and a lye dilution pump; The alkali liquid tank is connected to the outlet pipe of the alkali liquid dilution pump through the alkali liquid pump and is used to store the alkali liquid; The soft water tank is connected to the water inlet pipe of the alkali solution dilution pump; The outlet pipe of the alkali solution dilution pump is connected to the alkali solution nozzle and is used to extract soft water from the soft water tank, dilute the alkali solution with the soft water, and transmit the diluted alkali solution to the alkali solution nozzle; The blast furnace gas fine desulfurization system further comprises: a nitrogen device connected to a pipeline connecting the TRT system and the cleaning tower; The nitrogen equipment is used to deliver nitrogen to the pipeline connecting the catalytic hydrolysis system and the cleaning tower, thereby increasing the reaction area between the blast furnace gas after the catalytic hydrolysis and the circulating alkali water; The nitrogen equipment is also connected to the water outlet pipe of the alkali solution dilution pump and is used to add part of the nitrogen into the diluted alkali solution to make the water mist sprayed from the alkali solution nozzle more uniform and delicate.

2. The system according to claim 1, wherein The cleaning tower also includes: a demister, The demister is arranged in the cleaning tower and above the alkali solution nozzle.

3. The system according to claim 2, wherein: The cleaning tower further comprises: a production water nozzle; The production water nozzle is arranged in the cleaning tower and above the demister, and is used for flushing the demister.

4. The system according to claim 1, wherein: The system further comprises: a circulating alkali solution water tank and a circulating alkali solution water pump; The water inlet of the circulating alkali liquid pool is connected to the bottom of the cleaning tower and is used to collect the alkali liquid water flowing out of the cleaning tower; the water outlet of the circulating alkali liquid pool is connected to the gas pipeline nozzle and the circulating alkali liquid water nozzle through the circulating alkali liquid water pump; The circulating alkali liquid water pump is used to transmit the circulating alkali liquid water drawn from the circulating alkali liquid water pool to the gas pipeline nozzle and the circulating alkali liquid water nozzle.

5. The system according to claim 1, wherein: The system further comprises: a production water pool and a production water pump; the production water pool is connected to the production water nozzle via the production water pump.

6. A method for fine desulfurization of blast furnace gas, characterized in that: The method is applied to the blast furnace gas fine desulfurization system according to any one of claims 1 to 5, and the method comprises: After controlling the blast furnace gas to pass through the catalytic hydrolysis system, catalytically hydrolyzed blast furnace gas is obtained; The blast furnace gas after the catalytic hydrolysis is subjected to fine desulfurization treatment through a cleaning tower; wherein the cleaning tower is connected to the catalytic hydrolysis system; After the fine desulfurization treatment, the desulfurized blast furnace gas is released.

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