Blast furnace gas desulfurization method

Abstract

The invention relates to a blast furnace gas desulfurization method which comprises the following steps: S1, pretreating blast furnace gas to obtain dedusted blast furnace gas; s2, carrying out hydrolytic conversion on the dedusted blast furnace gas, and converting organic sulfur in the dedusted blast furnace gas into inorganic sulfur to obtain hydrolyzed blast furnace gas; s3, carrying out turbine power generation on the hydrolyzed blast furnace gas to reduce the pressure and temperature of the hydrolyzed blast furnace gas; s4, a desulfurizing agent is adopted for adsorption desulfurization of the blast furnace gas obtained in the S3, an adopted adsorbent is an amine liquid-ionic liquid composite desulfurizing agent, and the mass ratio of amine liquid to ionic liquid in the composite desulfurizing agent is 1: (0.1-0.15); s5, regenerating the adsorbent for adsorbing sulfur to obtain hydrogen sulfide; and step S6, carrying out oxidation treatment on the hydrogen sulfide to obtain elemental sulfur or sulfur. Desulfurization treatment can be carried out under low pressure, and the problem that traditional high-pressure desulfurization is high in difficulty is solved.

Description

Technical Field

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

[0002] The main components of typical blast furnace gas are N2, CO and CO2, of which the N2 content is about 52%-58% (volume fraction, the same below), the CO content is 20%-25%, the CO content is 18%-22%, and the rest is a small amount of H2, CH4 and O2. The sulfur in blast furnace gas can be divided into organic sulfur and inorganic sulfur according to its form, of which organic sulfur is mainly carbonyl sulfide (COS) with a content of 100-180mg / Nm3; inorganic sulfur is mainly H2S with a content of 30-60mg / Nm3. In order to achieve the ultra-low emission target of the steel industry, it is necessary to effectively desulfurize blast furnace gas.

[0003] The traditional end-of-line desulfurization method has a large gas processing volume, high investment, large floor space, and a large maintenance workload. Therefore, front-end desulfurization technology has become a practical option. Existing desulfurization technology mainly relies on alkali liquor reaction to generate sodium sulfide waste liquid. This method has many shortcomings: Generation of sodium sulfide waste liquid: Alkaline liquor reacts with hydrogen sulfide in blast furnace gas to generate a large amount of sodium sulfide waste liquid. The sodium sulfide solution needs further treatment and often reacts with oxygen in the air to generate sodium thiosulfate solution. Problems with the use of slag water: Sodium thiosulfate solution is generally used for blast furnace slag water. However, the temperature of blast furnace slag is greater than 1400 degrees Celsius. Under such high temperature conditions, sodium thiosulfate solution will decompose into sulfur dioxide (SO2), which may lead to disorderly emission of sulfur dioxide at the slag water site, and effective measures need to be taken to control emissions. Environmental protection and safety issues: The sodium sulfide and sodium thiosulfate solutions generated during the treatment process are corrosive, and improper treatment will cause damage to the environment and equipment. In addition, the disorderly emission of sulfur dioxide will have a negative impact on air quality. Summary of the invention

[0004] The main purpose of the present invention is to overcome the defects of the existing blast furnace gas desulfurization method and provide a new blast furnace gas desulfurization method. The technical problem to be solved is to improve the desulfurization efficiency, reduce costs, and be beneficial to environmental protection, so that it is more suitable for practical use and has industrial utilization value.

[0005] The purpose of the present invention and the technical problem to be solved are achieved by adopting the following technical solutions.

[0006] Compared with the prior art, the present invention has obvious advantages and beneficial effects. From the above technical scheme, it can be seen that in order to achieve the above-mentioned invention purpose, the main technical contents of the present invention are as follows:

[0007] The present invention provides a blast furnace gas desulfurization method, comprising:

[0008] Step S1, pre-treating blast furnace gas to obtain dust-removed blast furnace gas;

[0009] Step S2, hydrolyzing and converting the dust-removed blast furnace gas to convert organic sulfur in the dust-removed blast furnace gas into inorganic sulfur to obtain hydrolyzed blast furnace gas;

[0010] Step S3, using the hydrolyzed blast furnace gas to generate turbine electricity to reduce the pressure and temperature of the hydrolyzed blast furnace gas;

[0011] Step S4, using a desulfurizer to perform adsorption desulfurization on the blast furnace gas in step S3, wherein the adsorbent used is an amine liquid-ionic liquid composite desulfurizer, and the mass ratio of the amine liquid to the ionic liquid in the composite desulfurizer is 1:0.1-0.15;

[0012] Step S5, regenerating the adsorbent that adsorbs sulfur to obtain hydrogen sulfide;

[0013] Step S6, oxidizing the hydrogen sulfide to obtain elemental sulfur or sulfur.

[0014] In an optional embodiment, the dust content in the blast furnace gas after dust removal is less than 10 mg / m 3 .

[0015] In an optional embodiment, in step S2, the hydrolysis temperature is 130°C-150°C.

[0016] In an optional embodiment, in step S2, alumina is used as a hydrolysis catalyst when hydrolyzing and converting the blast furnace gas after dust removal, and the hydrolysis and conversion is carried out in a hydrolysis tower.

[0017] In an optional embodiment, in step S3, the hydrolyzed blast furnace gas is subjected to turbine power generation, the pressure of the blast furnace gas is reduced from 0.2MPa-0.3MPa to 0.1MPa-0.15MPa, and the temperature is reduced from 150℃-200℃ to 50℃-60℃.

[0018] In an optional embodiment, in step S3, the power generation pressure of the turbine power generation is 0.1MPa-0.15MPa, and the power generation temperature is 50℃-60℃.

[0019] In an optional embodiment, in step S4, the amine liquid is diethanolamine, and the ionic liquid is 1-butyl-3-methylimidazole dibutyl phosphate.

[0020] In an optional embodiment, in step S4, the ionized water in the solution of the composite desulfurizer accounts for 20%wt-45%wt of the solution of the composite desulfurizer.

[0021] In an optional embodiment, in step S4, after the blast furnace gas in step S3 is adsorbed by the desulfurizer, the H2S content in the blast furnace gas is less than 5 ppm.

[0022] In an optional embodiment, in step S5, the adsorbent that adsorbs sulfur is heated to 105°C-109°C and decompressed at 20kPa-59kPa to release hydrogen sulfide.

[0023] By means of the above technical solution, the present invention (name) has at least the following advantages:

[0024] The desulfurization method provided by the embodiment of the present invention reduces the dust content in the blast furnace gas by performing dust removal treatment on the blast furnace gas; converts the organic sulfur in the blast furnace gas after dust removal into inorganic sulfur by hydrolyzing and converting the blast furnace gas after dust removal, thereby improving the desulfurization efficiency of the blast furnace gas; performs turbine power generation on the hydrolyzed blast furnace gas to reduce the pressure and temperature of the hydrolyzed blast furnace gas, on the one hand, fully utilizes the capacity of the high-pressure blast furnace gas, and on the other hand, desulfurization treatment can be performed under low pressure, thereby solving the problem of high difficulty in traditional high-pressure desulfurization; sulfur adsorption can be well achieved by adopting an amine liquid-ionic liquid composite desulfurizer, and the amine liquid-ionic liquid composite desulfurizer can be suitable for desulfurization under low pressure conditions and has high desulfurization efficiency; by regenerating the adsorbent that adsorbs sulfur, the utilization efficiency of the adsorbent can be improved, and the environmental protection and economy of desulfurization can be achieved; finally, the regenerated hydrogen sulfide gas is oxidized to obtain elemental sulfur and sulfur, which can be continuously utilized, meets the requirements of environmental protection, is also suitable for the ultra-low emission requirements of the steel industry, and has broad application prospects.

[0025] In short, the desulfurization method provided by the embodiment of the present invention has the following beneficial effects: High-efficiency desulfurization: The desulfurizer can efficiently absorb hydrogen sulfide in blast furnace gas. Regeneration cycle: After the amine liquid-ionic liquid composite desulfurizer absorbs hydrogen sulfide, pure hydrogen sulfide can be released through regeneration, and the desulfurizer is restored to its initial state and can be recycled, which greatly reduces the operating cost. No waste liquid discharge: Unlike the traditional alkaline liquid method, the absorption regeneration system does not produce sodium sulfide waste liquid, avoiding the treatment problem of sodium sulfide and sodium thiosulfate, and reducing environmental pollution and treatment costs. Safety and environmental protection: The hydrogen sulfide released during the regeneration process can be centrally treated, avoiding the disorderly emission of sulfur dioxide and improving the safety and air quality of the working environment.

[0026] In summary, the special desulfurization method of the present invention reduces the dust content in the blast furnace gas by performing dust removal treatment on the blast furnace gas; converts the organic sulfur in the blast furnace gas after dust removal into inorganic sulfur by hydrolyzing and converting the blast furnace gas after dust removal, thereby improving the desulfurization efficiency of the blast furnace gas; performs turbine power generation on the hydrolyzed blast furnace gas to reduce the pressure and temperature of the hydrolyzed blast furnace gas, on the one hand, fully utilizes the capacity of the high-pressure blast furnace gas, and on the other hand, desulfurization treatment can be performed under low pressure, thereby solving the problem of high difficulty in traditional high-pressure desulfurization; sulfur adsorption can be well achieved by adopting an amine liquid-ionic liquid composite desulfurizer, and the amine liquid-ionic liquid composite desulfurizer can be suitable for desulfurization under low pressure conditions, and has high desulfurization efficiency; by regenerating the adsorbent for adsorbing sulfur, the utilization efficiency of the adsorbent can be improved, and the environmental protection and economy of desulfurization can be achieved; finally, the regenerated hydrogen sulfide gas is oxidized to obtain elemental sulfur and sulfur, which can be continuously utilized, meets the requirements of environmental protection, is also suitable for the ultra-low emission requirements of the steel industry, and has broad application prospects. It has the above-mentioned advantages and practical value, and no similar design has been publicly published or used in similar desulfurization methods, so it is indeed innovative. It has great improvements in both the desulfurization method and function, great progress in technology, and produces easy-to-use and practical effects. It has many improved functions compared with the existing desulfurization methods, so it is more suitable for practical use and has wide industrial utilization value. It is truly a novel, progressive and practical new design.

[0027] The above description is only an overview of the technical solution of the present invention. In order to more clearly understand the technical means of the present invention and implement it according to the contents of the specification, the following is a detailed description of the preferred embodiments of the present invention in conjunction with the accompanying drawings.

[0028] The specific desulfurization method of the present invention is given in detail by the following examples and their accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 A schematic flow chart of a desulfurization method provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0030] In order to further explain the technical means and effects adopted by the present invention to achieve the predetermined purpose of the invention, the specific implementation method, method, manufacturing method, processing method, steps, structure, characteristics and effects of the desulfurization method proposed in the present invention are described in detail below in combination with the accompanying drawings and preferred embodiments.

[0031] See also Figure 1 As shown, the blast furnace gas desulfurization method of a preferred embodiment of the present invention mainly comprises the following steps:

[0032] Step S1, pre-treating blast furnace gas to obtain dust-removed blast furnace gas.

[0033] Step S2, hydrolyzing and converting the dust-removed blast furnace gas to convert organic sulfur in the dust-removed blast furnace gas into inorganic sulfur to obtain hydrolyzed blast furnace gas.

[0034] Step S3, using the hydrolyzed blast furnace gas to generate turbine electricity to reduce the pressure and temperature of the hydrolyzed blast furnace gas.

[0035] Step S4, using a desulfurizer to perform adsorption desulfurization on the blast furnace gas in step S3, wherein the adsorbent used is an amine liquid-ionic liquid composite desulfurizer, and the mass ratio of the amine liquid to the ionic liquid in the composite desulfurizer is 1:0.1-0.15.

[0036] Step S5: regenerating the adsorbent that adsorbs sulfur to obtain hydrogen sulfide.

[0037] Step S6, oxidizing the hydrogen sulfide to obtain elemental sulfur or sulfur.

[0038] The desulfurization method provided by the embodiment of the present invention reduces the dust content in the blast furnace gas by performing dust removal treatment on the blast furnace gas; converts the organic sulfur in the blast furnace gas after dust removal into inorganic sulfur by hydrolyzing and converting the blast furnace gas after dust removal, thereby improving the desulfurization efficiency of the blast furnace gas; performs turbine power generation on the hydrolyzed blast furnace gas to reduce the pressure and temperature of the hydrolyzed blast furnace gas, on the one hand, fully utilizes the capacity of the high-pressure blast furnace gas, and on the other hand, desulfurization treatment can be performed under low pressure, thereby solving the problem of high difficulty in traditional high-pressure desulfurization; sulfur adsorption can be well achieved by adopting an amine liquid-ionic liquid composite desulfurizer, and the amine liquid-ionic liquid composite desulfurizer can be suitable for desulfurization under low pressure conditions and has high desulfurization efficiency; by regenerating the adsorbent that adsorbs sulfur, the utilization efficiency of the adsorbent can be improved, and the environmental protection and economy of desulfurization can be achieved; finally, the regenerated hydrogen sulfide gas is oxidized to obtain elemental sulfur and sulfur, which can be continuously utilized, meets the requirements of environmental protection, is also suitable for the ultra-low emission requirements of the steel industry, and has broad application prospects.

[0039] The method provided by the embodiment of the present invention will be further explained and described below through optional embodiments.

[0040] In step S1, blast furnace gas is pretreated to obtain dust-removed blast furnace gas.

[0041] In an optional embodiment, in step S1, the dust content in the blast furnace gas after dust removal is less than 10 mg / m 3 .

[0042] In the embodiment of the present invention, the blast furnace gas is dedusted by gravity dedusting and bag dedusting devices in sequence, and the dust content in the blast furnace gas after dedusting is less than 10 mg / m 3 This step is mainly to remove particulate matter in blast furnace gas to prevent clogging and wear of subsequent processing equipment.

[0043] In step S2, the blast furnace gas after dust removal is subjected to hydrolysis conversion, and the organic sulfur in the blast furnace gas after dust removal is converted into inorganic sulfur to obtain the hydrolyzed blast furnace gas.

[0044] Furthermore, the blast furnace gas after dust removal enters the hydrolysis conversion device to convert organic sulfur (such as carbonyl sulfide COS and carbon disulfide CS2) into inorganic sulfur (hydrogen sulfide H2S).

[0045] Exemplarily, the hydrolysis conversion device includes two processes: hydrolysis and distillation. In the hydrolysis process, blast furnace gas is usually hydrolyzed using a strong acid or a strong base to produce a hydrolysis reaction, releasing elements or molecules in the sample. This process can be carried out at high temperature, using a glass reactor or a heating plate to heat the sample. The distillation process is to cool the gas produced in the hydrolysis reaction through a cooler and convert it into a liquid state, and then collect it through a gas collector.

[0046] In an optional embodiment, in step S2, the hydrolysis temperature is 130°C-150°C.

[0047] Illustratively, the temperature of the hydrolysis may be 130°C, 132°C, 135°C, 140°C, 145°C, 146°C, 147°C, 148°C, 149°C, 150°C, etc.

[0048] In an optional embodiment, in step S2, alumina is used as a hydrolysis catalyst when hydrolyzing and converting the blast furnace gas after dust removal, and the hydrolysis and conversion is carried out in a hydrolysis tower.

[0049] In step S3, the hydrolyzed blast furnace gas is subjected to turbine power generation to reduce the pressure and temperature of the hydrolyzed blast furnace gas.

[0050] In an optional embodiment, in step S3, the power generation pressure of the turbine power generation is 0.1MPa-0.15MPa, and the power generation temperature is 50℃-60℃.

[0051] The hydrolyzed blast furnace gas enters the turbine generator (TRT), which uses the pressure and temperature of the gas to generate electricity, thereby improving energy efficiency. This step not only recovers part of the energy of the blast furnace gas, but also reduces the temperature of the gas, providing favorable conditions for subsequent desulfurization treatment.

[0052] In an optional embodiment, in step S3, the hydrolyzed blast furnace gas is subjected to turbine power generation, and the pressure of the blast furnace gas is reduced from 0.2MPa-0.3MPa to 0.1MPa-0.15MPa, and the temperature is reduced from 150℃-200℃ to 50℃-60℃.

[0053] Furthermore, the hydrolyzed blast furnace gas is introduced into a turbine power generation device to generate electricity using the pressure and temperature of the blast furnace gas, reducing the blast furnace gas pressure from 0.2MPa-0.3MPa to 0.1MPa-0.15MPa, and the temperature from 150℃-200℃ to 50℃-60℃.

[0054] In step S4, a desulfurizing agent is used to perform adsorption desulfurization on the blast furnace gas in step S3, wherein the adsorbent used is an amine liquid-ionic liquid composite desulfurizing agent, and the mass ratio of the amine liquid to the ionic liquid in the composite desulfurizing agent is 1:0.1-0.15.

[0055] Furthermore, the mass ratio of the amine liquid to the ionic liquid in the composite desulfurizer can be 1:0.1 or 1:0.15.

[0056] In an optional embodiment, in step S4, the amine liquid is diethanolamine, and the ionic liquid is 1-butyl-3-methylimidazole dibutyl phosphate.

[0057] In an optional embodiment, in step S4, the ionized water in the solution of the composite desulfurizer accounts for 20%wt-45%wt of the solution of the composite desulfurizer. Exemplarily, it can be 20%wt, 25%wt, 27%wt, 30%wt, 35%wt, 39%wt, 40%wt, 43%wt, 45%wt, etc.

[0058] In an optional embodiment, in step S4, after the blast furnace gas in step S3 is adsorbed by the desulfurizer, the H2S content in the blast furnace gas is less than 5 ppm.

[0059] Blast furnace gas enters the absorption device to absorb hydrogen sulfide in the blast furnace gas. Different from the traditional high-pressure desulfurization application scenario, the absorption technology of the present invention is suitable for the removal of hydrogen sulfide under low-pressure conditions. In order to achieve the best effect, the present invention uses a composite formula of amine liquid and ionic liquid, and through adaptation testing, ensures its efficient desulfurization ability under low pressure, which can reduce the hydrogen sulfide content from 300ppm to less than 5ppm.

[0060] In step S5, the adsorbent that adsorbs sulfur is regenerated to obtain hydrogen sulfide.

[0061] In an optional embodiment, in step S5, the adsorbent that adsorbs sulfur is heated to 105°C-109°C and decompressed at 20kPa-59kPa to release hydrogen sulfide.

[0062] The amine liquid-ion liquid is regenerated by a regeneration device, heated to 105°C-109°C and decompressed at 20kPa-59kPa to release hydrogen sulfide, and the amine liquid is restored to its initial state for recycling.

[0063] The embodiment of the present invention regenerates by a regeneration device to release hydrogen sulfide, and the amine liquid is restored to its initial state for recycling. The regeneration process usually adopts a heating and decompression method to precipitate hydrogen sulfide gas in the amine liquid-ionic liquid desulfurizer, and then the amine liquid is cooled and purified and put back into use. The regeneration cycle not only reduces the operating cost, but also reduces the consumption of chemicals and the generation of waste liquid.

[0064] In step S6, hydrogen sulfide is oxidized to obtain elemental sulfur or sulfur.

[0065] The released hydrogen sulfide is processed by subsequent treatment equipment to eventually generate sulfur or other usable sulfides. This step can be done in a variety of ways, such as oxidation of hydrogen sulfide to generate sulfur, or reaction with other chemical substances to generate reusable byproducts, ensuring the safe and environmentally friendly treatment of hydrogen sulfide.

[0066] The method provided by the embodiment of the present invention will be further explained and illustrated by optional embodiments below.

[0067] The method provided in the embodiment of the present invention may include the following steps:

[0068] Blast furnace gas pretreatment steps

[0069] After the blast furnace gas comes out from the furnace top, it first passes through the gravity dust removal and bag dust removal device to reduce the dust content to less than 10mg / m3. This step can prevent the blockage and wear of the subsequent treatment device and improve the stability and life of the system.

[0070] Hydrolysis conversion step

[0071] After dust removal, the blast furnace gas enters the hydrolysis conversion device, where it is hydrolyzed using a high-temperature catalyst (such as alumina) or a hydrolysis tower to convert organic sulfur (COS and CS2) into inorganic sulfur (H2S). The hydrolysis temperature is controlled at 130-150°C to ensure complete conversion of organic sulfur.

[0072] Turbine power generation (TRT) steps

[0073] The blast furnace gas after hydrolysis enters the turbine power generation device (TRT), and generates electricity using the pressure and temperature of the gas. The gas pressure drops from 0.2-0.3MPa to 0.1-0.15MPa, and the temperature drops from 150-200℃ to 50-60℃, providing favorable conditions for subsequent desulfurization treatment.

[0074] Desulfurization agent absorption step

[0075] Blast furnace gas enters the absorption tower and is absorbed at low pressure using composite amine liquid-ionic liquid (DEA and 1-butyl-3-methylimidazole dibutyl phosphate salt, mass ratio 1:0.12, desalted water accounts for 30%wt of the total absorption liquid). The absorption temperature is controlled at 40-50℃, which can reduce the H2S content in the gas from 300ppm to less than 5ppm.

[0076] Regeneration cycle steps

[0077] After absorbing hydrogen sulfide, the amine liquid-ion liquid is regenerated by a regeneration device. The regeneration process is heated to 105-109°C and decompressed at 20-59KPa to precipitate hydrogen sulfide gas. Then, the amine liquid-ion liquid is cooled to 40-50°C, restored to its initial state, and put back into use.

[0078] Hydrogen sulfide treatment

[0079] The released hydrogen sulfide is oxidized by air at 180-200°C in an oxidation reaction device (e.g., an oxidation tower) to generate sulfur, or sulfur is generated by a pressurized absorption reaction. The final product can be recycled to ensure the safe and environmentally friendly treatment of hydrogen sulfide.

[0080] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any form. Although the present invention has been disclosed as a preferred embodiment as above, it is not used to limit the present invention. Any technician familiar with this profession can make some changes or modifications to equivalent embodiments of equivalent changes by using the methods and technical contents disclosed above without departing from the scope of the technical solution of the present invention. However, any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present invention without departing from the content of the technical solution of the present invention still fall within the scope of the technical solution of the present invention.

Claims

1. A method for desulfurizing blast furnace gas, characterized in that: include: Step S1, pre-treating blast furnace gas to obtain dust-removed blast furnace gas; Step S2, hydrolyzing and converting the dust-removed blast furnace gas to convert organic sulfur in the dust-removed blast furnace gas into inorganic sulfur to obtain hydrolyzed blast furnace gas; Step S3, using the hydrolyzed blast furnace gas to generate turbine electricity to reduce the pressure and temperature of the hydrolyzed blast furnace gas; Step S4, using a desulfurizer to perform adsorption desulfurization on the blast furnace gas in step S3, wherein the adsorbent used is an amine liquid-ionic liquid composite desulfurizer, and the mass ratio of the amine liquid to the ionic liquid in the composite desulfurizer is 1:0.1-0.15; Step S5, regenerating the adsorbent that adsorbs sulfur to obtain hydrogen sulfide; Step S6, oxidizing the hydrogen sulfide to obtain elemental sulfur or sulfur.

2. The method for desulfurizing blast furnace gas according to claim 1, characterized in that: In step S1, the dust content in the blast furnace gas after dust removal is less than 10 mg / m 3 .

3. The method for desulfurizing blast furnace gas according to claim 1, characterized in that: In step S2, the hydrolysis temperature is 130°C-150°C.

4. The method for desulfurizing blast furnace gas according to claim 1, characterized in that: In step S2, alumina is used as a hydrolysis catalyst when hydrolyzing and converting the blast furnace gas after dust removal, and the hydrolysis and conversion is carried out in a hydrolysis tower.

5. The method for desulfurizing blast furnace gas according to claim 1, characterized in that: In step S3, the hydrolyzed blast furnace gas is subjected to turbine power generation, and the pressure of the blast furnace gas is reduced from 0.2MPa-0.3MPa to 0.1MPa-0.15MPa, and the temperature is reduced from 150℃-200℃ to 50℃-60℃.

6. The method for desulfurizing blast furnace gas according to claim 1, characterized in that: In step S3, the power generation pressure of the turbine power generation is 0.1MPa-0.15MPa, and the power generation temperature is 50℃-60℃.

7. The method for desulfurizing blast furnace gas according to claim 1, characterized in that: In step S4, the amine liquid is diethanolamine, and the ionic liquid is 1-butyl-3-methylimidazole dibutyl phosphate.

8. The method for desulfurizing blast furnace gas according to claim 1, characterized in that: In step S4, the ionized water in the composite desulfurizing agent solution accounts for 20%wt-45%wt of the composite desulfurizing agent solution.

9. The method for desulfurizing blast furnace gas according to claim 1, characterized in that: In step S4, after the blast furnace gas in step S3 is adsorbed by the desulfurizer, the H2S content in the blast furnace gas is less than 5 ppm.

10. The method for desulfurizing blast furnace gas according to claim 1, characterized in that: In step S5, the adsorbent that adsorbs sulfur is heated to 105°C-109°C and decompressed at 20kPa-59kPa to release hydrogen sulfide.

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