Hydrolysis and activated carbon-based fine desulfurization method and apparatus for blast furnace gas

Abstract

The present invention relates to a hydrolysis and activated carbon-based fine desulfurization method and apparatus for blast furnace gas. The apparatus comprises a pressure booster, a heater, a hydrolysis reactor, a cooler, a front activated carbon desulfurization tank, and a rear activated carbon desulfurization tank. Blast furnace gas piping is connected to the pressure booster; an outlet of the pressure booster is connected to a gas inlet of the heater; an outlet of the heater is connected to the hydrolysis reactor; an inlet steam pipe and an outlet steam pipe are connected to the heater; an outlet of the hydrolysis reactor is connected to the cooler by means of an outlet gas pipe; an outlet of the cooler is connected to the front activated carbon desulfurization tank and the rear activated carbon desulfurization tank; and outlets of the front activated carbon desulfurization tank and the rear activated carbon desulfurization tank are connected to rear-end main piping. The advantages are as follows: by using the method of the present invention for desulfurizing blast furnace gas, the desulfurization efficiency (i.e., the ratio of removed sulfur to total sulfur in the gas) is greater than 98%, and the total sulfur at the outlet is less than or equal to 10 mg / Nm3.

Description

A method and apparatus for fine desulfurization of coal gas using hydrolysis and activated carbon Technical Field

[0001] This invention belongs to the field of blast furnace gas purification, and particularly relates to a method and apparatus for fine desulfurization of coal gas using hydrolysis and activated carbon. Background Technology

[0002] Currently, the steel industry has officially entered the era of "ultra-low emissions," which requires that SO2 emissions from blast furnace gas combustion in the ironmaking process meet ultra-low emission limits. Some regions even have lower standards, with total sulfur at the export level ≤10mg / Nm³. 3 .

[0003] The concentration of gaseous sulfur pollutants in blast furnace gas is mostly concentrated in the range of 100–200 mg / Nm³. 3 Of the total sulfur in blast furnace gas, organic sulfur is mainly carbonyl sulfide (COS), accounting for about 70%; inorganic sulfur is mainly hydrogen sulfide (H2S), accounting for 25% to 30%. The sulfur composition of blast furnace gas is complex. Carbonyl sulfide (COS) is relatively stable and difficult to react directly with other compounds. Therefore, the removal of COS and H2S is both a key focus and a challenge.

[0004] Because the technology for fine desulfurization of blast furnace gas has only been around for a short time, many of the units that have been put into operation or are under construction have large footprints, especially in old plant areas, due to immature process routes, large fluctuations in gas conditions, and a series of problems with operating levels. This makes it difficult to arrange these units, resulting in poor long-term stable operation and low desulfurization efficiency. Summary of the Invention

[0005] The purpose of this invention is to provide a method and apparatus for fine desulfurization of blast furnace gas using hydrolysis and activated carbon, which can achieve a desulfurization efficiency (ratio of desulfurized amount to total sulfur in the gas) greater than 98% and an outlet total sulfur content ≤10 mg / Nm³. 3 It meets ultra-low emission requirements, has a small footprint, and can operate stably for a long time.

[0006] To achieve the above objectives, the present invention provides the following technical solution:

[0007] A hydrolysis and activated carbon coal gas desulfurization device includes a booster, a heater, a hydrolysis reactor, a cooler, a pre-activated carbon desulfurization tank, and a post-activated carbon desulfurization tank;

[0008] The blast furnace gas pipeline is connected to the pressure press, the pressure press outlet is connected to the heater inlet, the heater outlet is connected to the hydrolysis reactor, and the heater is connected to the inlet steam pipeline and the outlet steam pipeline.

[0009] The outlet of the hydrolysis reactor is connected to the cooler via the outlet gas pipeline; the outlet of the cooler is connected to the front activated carbon desulfurization tank and the rear activated carbon desulfurization tank, and the outlets of the front activated carbon desulfurization tank and the rear activated carbon desulfurization tank are connected to the rear main pipeline.

[0010] It also includes the main inlet gas pipeline of the desulfurization tank, the branch inlet gas pipelines of the desulfurization tank, the connection between the main inlet gas pipeline of the desulfurization tank and the outlet of the cooler, the connection between the main inlet gas pipeline of the desulfurization tank and the branch inlet gas pipelines of multiple desulfurization tanks, and the connection between the branch inlet gas pipelines of the desulfurization tank and the front activated carbon desulfurization tank and the rear activated carbon desulfurization tank.

[0011] Both the pre-activated carbon desulfurization tank and the post-activated carbon desulfurization tank are two-stage structures, each consisting of two tanks.

[0012] The desulfurization tank inlet gas main pipeline is connected to the oxygen replenishment pipeline.

[0013] The hydrolysis reactor is a square structure, connected to the pipeline by flanges and reducing pipes. A steam pipe is connected to the middle of the hydrolysis reactor to maintain the bed temperature by steam heating. The hydrolysis reactor is filled with carbonyl sulfur hydrolysis catalyst. The heated blast furnace gas passes through the carbonyl sulfur hydrolysis catalyst from bottom to top to complete the hydrolysis process of converting organic sulfur into inorganic sulfur.

[0014] The outlets of the pre-activated carbon desulfurization tank and the post-activated carbon desulfurization tank are connected to the front-end main pipeline and the rear-end main pipeline; a spare cross pipeline between the pre-activated carbon desulfurization tank and the post-activated carbon desulfurization tank is connected between the front-end main pipeline and the inlet gas main pipeline of the desulfurization tank.

[0015] It also includes a nitrogen purging pipeline, which is connected to the booster, heater, cooler, pre-activated carbon desulfurization tank, and post-activated carbon desulfurization tank.

[0016] A bypass pipeline is connected to the blast furnace gas pipeline.

[0017] A method for fine desulfurization of coal gas using hydrolysis and activated carbon includes the following steps:

[0018] 1) After the blast furnace gas is pressurized to 25-28 kPa by the pressure booster, it enters the heater;

[0019] 2) The low-pressure steam in the plant area is used as heat energy and sent to the heater to heat the blast furnace gas to 140-160℃;

[0020] 3) Blast furnace gas is desulfurized in a hydrolysis reactor using a carbonyl sulfur hydrolysis desulfurization catalyst, which reacts COS in the gas with water to convert it into H2S, and converts COS with a volume content of more than 85% in the blast furnace gas into hydrogen sulfide.

[0021] 4) Use clean circulating water in the cooler to cool the blast furnace gas. After the temperature of the blast furnace gas drops to 45-60℃, it enters the pre-activated carbon desulfurization tank and the post-activated carbon desulfurization tank for deep desulfurization. Finally, it is sent to the pipeline network through the back-end main pipeline.

[0022] The carbonyl sulfur hydrolysis catalyst mentioned in step 3) is prismatic in shape with a bulk density of 0.85–0.95 kg / m³. 3 The pre-activated carbon desulfurization tank and post-activated carbon desulfurization tank are filled with activated carbon desulfurizing agent, the bulk density of which is 0.48–0.58 kg / dm³. 3 Sulfur capacity ≥20%, carbon content ≥80%.

[0023] Compared with the prior art, the beneficial effects of the present invention are:

[0024] 1. The method of this invention for desulfurizing blast furnace gas achieves a desulfurization efficiency (ratio of desulfurized amount to total sulfur in the gas) greater than 98% and an outlet total sulfur content ≤10 mg / Nm³. 3 .

[0025] 2. This invention uses a carbonyl sulfur hydrolysis desulfurization catalyst in a hydrolysis reactor, achieving a hydrolysis rate of ≥85%, a service life of ≥3 years, and stable hydrolysis performance.

[0026] 3. The equipment of this invention has a compact layout and occupies a small area. Attached Figure Description

[0027] Figure 1 is a schematic diagram of the hydrolysis and activated carbon coal gas desulfurization device.

[0028] Figure 2 is a schematic diagram of the hydrolysis and activated carbon coal gas desulfurization device.

[0029] In the diagram: 1-Blast furnace gas pipeline; 2-Pressure press; 3-Pressure press outlet gas pipeline; 4-Heater; 5-Heater inlet steam pipeline; 6-Heater outlet steam pipeline; 7-Heater outlet gas pipeline; 8-Hydrolysis reactor; 9-Hydrolysis reactor outlet gas pipeline; 10-Cooler; 11-Cooler outlet gas pipeline; 12-Cooler inlet cooling water pipeline; 13-Cooler outlet cooling water pipeline; 14-Nitrogen purging main pipeline; 15-Nitrogen purging main pipeline. 16 - Nitrogen venting pipeline; 17 - Bypass pipeline; 18 - Desulfurization tank inlet gas main pipeline; 19 - Oxygen replenishment pipeline; 20 - Desulfurization tank inlet gas branch pipeline; 21 - Pre-activated carbon desulfurization tank; 22 - Desulfurization tank outlet gas branch pipeline; 23 - Desulfurization tank activated carbon outlet; 24 - Backup cross pipeline between pre-desulfurization tank and post-desulfurization tank; 25 - Post-activated carbon desulfurization tank; 26 - Desulfurization tank outlet gas front-end main pipeline; 27 - Desulfurization tank outlet gas rear-end main pipeline. Detailed Implementation

[0030] The present invention will now be described in detail with reference to the accompanying drawings, but it should be noted that the implementation of the present invention is not limited to the following embodiments.

[0031] As shown in Figures 1 and 2, a hydrolysis and activated carbon gas desulfurization device includes a booster 2, a heater 4, a hydrolysis reactor 8, a cooler 10, a pre-activated carbon desulfurization tank 21, and a post-activated carbon desulfurization tank 25. A blast furnace gas pipeline 1 is connected to the booster 2. The outlet of the booster 2 is connected to the heater 4 via a booster outlet gas pipeline 3. The outlet of the heater 4 is connected to the hydrolysis reactor 8 via a heater outlet gas pipeline 7. The heater 4 is connected to a heater inlet steam pipeline 5 and a heater outlet steam pipeline 6. The blast furnace gas pipeline 1 is equipped with blast furnace gas safety devices, namely a pneumatic gas quick-cut-off valve, an electric butterfly valve, and an electric blind valve. Additionally, a sulfur content detection device is connected to the blast furnace gas pipeline 1. A detection device is connected to the connecting pipeline between the outlet of the booster 2 and the inlet of the heater 4; this detection device measures pressure, temperature, and flow rate. A temperature and pressure detection device is connected to the heater outlet gas pipeline 7. The heater inlet steam pipeline 5 is connected to a shut-off valve and a regulating valve, which are interlocked with the temperature detection device on the heater outlet gas pipeline 7. The heater inlet steam pipeline 5 is also connected to pressure, temperature, and flow detection devices. A shut-off valve and a steam trap are installed on the heater outlet steam pipeline 6, which discharges into the nearest drainage well.

[0032] The outlet of hydrolysis reactor 8 is connected to cooler 10 via hydrolysis reactor outlet gas pipeline 9; the outlet of cooler 10 is connected to pre-activated carbon desulfurization tank 21 and post-activated carbon desulfurization tank 25 via cooler outlet gas pipeline 11, and the outlets of pre-activated carbon desulfurization tank 21 and post-activated carbon desulfurization tank 25 are connected to the rear main pipeline 27. Pressure and temperature detection devices are installed on hydrolysis reactor outlet gas pipeline 9.

[0033] The hydrolysis reactor 8 has a square structure and is connected to the pipeline via flanges and reducing pipes. External reinforcing ribs are installed. A steam pipe is connected to the center of the reactor to maintain the bed temperature using steam heating. The reactor 8 is filled with a carbonyl sulfur hydrolysis catalyst. Heated blast furnace gas passes through the catalyst from bottom to top, completing the hydrolysis process of converting organic sulfur into inorganic sulfur. The reactor 8 has five temperature sensors and four pressure sensors from top to bottom to monitor the hydrolysis status.

[0034] The hydrolysis and activated carbon gas desulfurization unit also includes a main inlet gas pipeline 18 for the desulfurization tanks and four branch inlet gas pipelines 20 for the four desulfurization tanks. The outlet of the cooler 10 is connected to the main inlet gas pipeline 18 for the desulfurization tanks via the cooler outlet gas pipeline 11. The main inlet gas pipeline 18 for the desulfurization tanks is connected to the four branch inlet gas pipelines 20 for the four desulfurization tanks. The branch inlet gas pipelines 20 for the desulfurization tanks are connected to the pre-activated carbon desulfurization tank 21 and the post-activated carbon desulfurization tank 25. An electric butterfly valve is installed on the main inlet gas pipeline 18 for the desulfurization tanks. The main inlet gas pipeline 18 for the desulfurization tanks is connected to an oxygen supply pipeline 19. The oxygen supply pipeline 19 is connected to a shut-off valve, a regulating valve, a venting pipeline 16, and a detection device, which includes pressure, temperature, and flow rate sensors. If the oxygen content in the desulfurization system is sufficient for the H2S reaction, the oxygen supply pipeline 19 does not need to be activated; otherwise, it needs to be activated.

[0035] Both the pre-activated carbon desulfurization tank 21 and the post-activated carbon desulfurization tank 25 are two-stage structures, each consisting of two tanks. Of the four inlet gas branch lines 20 for the desulfurization tanks, the first two connect to the pre-activated carbon desulfurization tank 21, and the latter two connect to the post-activated carbon desulfurization tank 25. Each of the four inlet gas branch lines 20 is equipped with an electric butterfly valve and an electric blind valve. At the bottom of both the pre-activated carbon desulfurization tank 21 and the post-activated carbon desulfurization tank 25, there is an activated carbon outlet 23. An electric ash discharge ball valve is connected to the activated carbon outlet 23; opening this valve releases the waste activated carbon, which is then transported away by truck.

[0036] Cooler 10 uses circulating water to cool the blast furnace gas. Since the gas temperature after passing through hydrolysis reactor 8 is high, cooler 10 is used to lower the blast furnace gas temperature to ensure the adsorption efficiency of activated carbon. The outlet temperature of the blast furnace gas from cooler 10 is 45–60°C. Cooler 10 is also connected to cooler inlet cooling water pipe 12 and cooler outlet cooling water pipe 13. Cooler inlet cooling water pipe 12 is equipped with a shut-off valve, a regulating valve, and a detection device. The detection device includes pressure and flow detection. The regulating valve is interlocked with the temperature detection device on cooler outlet gas pipe 11. Cooler outlet cooling water pipe 13 is equipped with a shut-off valve and a temperature detection device.

[0037] The cooled blast furnace gas is sent to the pre-activated carbon desulfurization tank 21 and the post-activated carbon desulfurization tank 25 for deep desulfurization. There are two stages of activated carbon adsorption, comprising four tanks, which can be used in pairs in parallel or simultaneously. Specifically, the outlets of the pre-activated carbon desulfurization tank 21 and the post-activated carbon desulfurization tank 25 are connected to the rear-end main pipeline 27 via the front-end main pipeline 26. A backup cross pipeline 24 between the front-end main pipeline 26 and the desulfurization tank inlet gas main pipeline 18 connects the pre-activated carbon desulfurization tank and the post-activated carbon desulfurization tank. All three pipelines are equipped with electric butterfly valves. Closing the desulfurization tank inlet gas main pipeline 18 and the front-end main pipeline 26, and opening the backup cross pipeline 24 between the pre-activated carbon desulfurization tank and the post-activated carbon desulfurization tank, allows the blast furnace gas to first undergo desulfurization through the two pre-activated carbon desulfurization tanks 21, and then through the post-activated carbon desulfurization tank 25, operating in pairs in parallel. If the main gas inlet pipeline 18 and the front-end main pipeline 26 of the desulfurization tank are opened, and the backup cross pipeline 24 between the front desulfurization tank and the rear desulfurization tank is closed, the blast furnace gas can simultaneously enter the front activated carbon desulfurization tank 21 and the rear activated carbon desulfurization tank 25 for desulfurization, and the working system is to use them simultaneously.

[0038] The pre-activated carbon desulfurization tank 21 and the post-activated carbon desulfurization tank 25 are respectively connected to four desulfurization tank outlet gas branch pipelines 22. Electric blind flange valves and electric butterfly valves are also installed on the desulfurization tank outlet gas branch pipelines 22. The four desulfurization tank outlet gas branch pipelines 22 are then connected to the front end main pipeline 26 of the desulfurization tank outlet gas. Pressure and temperature detection devices are installed on the front end of the desulfurization tank outlet gas. The front end of the desulfurization tank outlet gas is then directly connected to the rear end main pipeline 27 of the desulfurization tank outlet gas. Pressure, temperature, oxygen content, and sulfur content detection devices are installed on the rear end main pipeline 27 of the desulfurization tank outlet gas. Electric blind flange valves and electric butterfly valves are also installed. The rear end main pipeline 27 of the desulfurization tank outlet gas is connected to the pipeline network. The desulfurization efficiency can be calculated by comparing the sulfur content of the gas in the rear end main pipeline 27 of the desulfurization tank outlet gas with the sulfur content in the inlet gas pipeline of the press 2.

[0039] The hydrolysis and activated carbon gas desulfurization unit also includes a nitrogen purging pipeline, which is connected to the booster 2, heater 4, cooler 10, pre-activated carbon desulfurization tank 21, and post-activated carbon desulfurization tank 25. The nitrogen purging pipeline includes a main nitrogen purging pipeline 14, branch nitrogen purging pipelines 15, and nitrogen venting pipelines 16, all of which belong to the nitrogen purging system and are set up in accordance with the blast furnace gas safety regulations.

[0040] A bypass pipeline 17 is connected to the blast furnace gas pipeline 1. The bypass pipeline 17 is equipped with an electric butterfly valve and an electric blind valve. When the desulfurization system is under maintenance, the bypass pipeline 17 is opened, and the blast furnace gas flows through the bypass pipeline 17. The blast furnace gas does not pass through the hydrolysis and activated carbon gas fine desulfurization device, and does not affect normal production.

[0041] The hydrolysis and activated carbon coal gas desulfurization unit is arranged using the existing site. The roof of the control room and instrument room serves as the second platform, and a third platform is built. The front activated carbon desulfurization tank 21 and the rear activated carbon desulfurization tank 25 are arranged on the second and third platforms. The heater 4 and the cooler 10 are arranged using the gap between the two platforms where the desulfurization tanks 21 and 25 are located. The hydrolysis reactor 8 has a small planar size of only 1400×1400mm. Various large pipelines are arranged using the frame columns and beams for support. All of the above makes the entire unit and pipelines arranged within a horizontal rectangular 20000×6700mm frame, which greatly reduces the footprint of the unit.

[0042] The hydrolysis and activated carbon desulfurization method for coal gas includes the following steps:

[0043] 1) Blast furnace gas needs to pass through hydrolysis reactor 8 and activated carbon desulfurization tank, which inevitably leads to pressure loss and affects production. Therefore, a pressure booster 2 must be installed at the front end to meet production needs. After the pressure of blast furnace gas is increased to 25-28 kPa by the pressure booster 2, it enters heater 4.

[0044] 2) The low-pressure steam in the plant area is used as heat energy and sent to heater 4 to heat the blast furnace gas to 140-160℃ to meet the conditions for the hydrolysis reaction of organic sulfur.

[0045] 3) Blast furnace gas is desulfurized in hydrolysis reactor 8 using a carbonyl sulfur hydrolysis desulfurization catalyst. This catalyst reacts with water to convert COS in the gas into H2S, converting over 85% COS by volume into hydrogen sulfide. The catalyst has a long lifespan and provides stable hydrolysis results. The reaction process is as follows:

[0046] COS + H2O = H2S + CO2, reaction temperature: 140~160℃.

[0047] The carbonyl sulfur hydrolysis catalyst is white, prismatic in shape, measuring 135×135×500mm, with a bulk density of 0.85~0.95kg / m³. 3 This catalyst can effectively catalyze the hydrolysis of carbonyl sulfur at high hydrogen sulfide concentrations, allowing COS in coal gas to react with water and be converted into H2S.

[0048] 4) The blast furnace gas is cooled by using clean circulating water in the cooler 10. After the temperature of the blast furnace gas drops to 45-60℃, it enters the pre-activated carbon desulfurization tank 21 and the post-activated carbon desulfurization tank 25 for deep desulfurization. The H2S generated after hydrolysis in the gas and the residual H2S in the gas react with oxygen in the tank to generate elemental sulfur, which is adsorbed on the activated carbon, thus completing the deep desulfurization of the gas. Finally, it is sent to the gas pipeline network through the rear main pipeline 27.

[0049] The reaction process in this process is as follows:

[0050] 2H2S + O2 = 1 / 4S8 + 2H2O, reaction temperature: 45-60℃.

[0051] The pre-activated carbon desulfurization tank 21 and the post-activated carbon desulfurization tank 25 are filled with activated carbon desulfurizing agent, the specifications of which are as follows: Its bulk density is 0.48–0.58 kg / dm³. 3 Sulfur capacity ≥20%, carbon content ≥80%.

[0052] This invention utilizes a carbonyl sulfur hydrolysis desulfurization catalyst within a hydrolysis reactor, achieving a hydrolysis rate ≥85%, a service life ≥3 years, and stable hydrolysis performance. Using this method for desulfurization of blast furnace gas, the desulfurization efficiency (ratio of removed sulfur to total sulfur in the gas) is greater than 98%, and the outlet total sulfur is ≤10 mg / Nm³. 3 .

Claims

1. A hydrolysis and activated carbon coal gas desulfurization device, characterized in that, Includes a booster press, heater, hydrolysis reactor, cooler, pre-activated carbon desulfurization tank, and post-activated carbon desulfurization tank; The blast furnace gas pipeline is connected to the pressure press, the pressure press outlet is connected to the heater inlet, the heater outlet is connected to the hydrolysis reactor, and the heater is connected to the inlet steam pipeline and the outlet steam pipeline. The outlet of the hydrolysis reactor is connected to the cooler via the outlet gas pipeline; the outlet of the cooler is connected to the front activated carbon desulfurization tank and the rear activated carbon desulfurization tank, and the outlets of the front activated carbon desulfurization tank and the rear activated carbon desulfurization tank are connected to the rear main pipeline.

2. The hydrolysis and activated carbon coal gas desulfurization device according to claim 1, characterized in that, It also includes the main inlet gas pipeline of the desulfurization tank, the branch inlet gas pipelines of the desulfurization tank, the connection between the main inlet gas pipeline of the desulfurization tank and the outlet of the cooler, the connection between the main inlet gas pipeline of the desulfurization tank and the branch inlet gas pipelines of multiple desulfurization tanks, and the connection between the branch inlet gas pipelines of the desulfurization tank and the front activated carbon desulfurization tank and the rear activated carbon desulfurization tank.

3. The hydrolysis and activated carbon coal gas desulfurization device according to claim 2, characterized in that, Both the pre-activated carbon desulfurization tank and the post-activated carbon desulfurization tank are two-stage structures, each consisting of two tanks.

4. The hydrolysis and activated carbon coal gas desulfurization device according to claim 2, characterized in that, The desulfurization tank inlet gas main pipeline is connected to the oxygen replenishment pipeline.

5. The hydrolysis and activated carbon coal gas desulfurization device according to claim 1, characterized in that, The hydrolysis reactor is a square structure, connected to the pipeline by flanges and reducing pipes. A steam pipe is connected to the middle of the hydrolysis reactor to maintain the bed temperature by steam heating. The hydrolysis reactor is filled with carbonyl sulfur hydrolysis catalyst. The heated blast furnace gas passes through the carbonyl sulfur hydrolysis catalyst from bottom to top to complete the hydrolysis process of converting organic sulfur into inorganic sulfur.

6. The hydrolysis and activated carbon coal gas desulfurization device according to claim 1, characterized in that, The outlets of the pre-activated carbon desulfurization tank and the post-activated carbon desulfurization tank are connected to the front-end main pipeline and the rear-end main pipeline; a spare cross pipeline between the pre-activated carbon desulfurization tank and the post-activated carbon desulfurization tank is connected between the front-end main pipeline and the inlet gas main pipeline of the desulfurization tank.

7. The hydrolysis and activated carbon coal gas desulfurization device according to claim 1, characterized in that, It also includes a nitrogen purging pipeline, which is connected to the booster, heater, cooler, pre-activated carbon desulfurization tank, and post-activated carbon desulfurization tank.

8. The hydrolysis and activated carbon coal gas desulfurization device according to claim 1, characterized in that, A bypass pipeline is connected to the blast furnace gas pipeline.

9. A method for fine desulfurization of coal gas by hydrolysis and activated carbon implemented by the apparatus according to any one of claims 1-8, characterized in that, Includes the following steps: 1) After the blast furnace gas is pressurized to 25-28 kPa by the pressure booster, it enters the heater; 2) The low-pressure steam in the plant area is used as heat energy and sent to the heater to heat the blast furnace gas to 140-160℃; 3) Blast furnace gas is desulfurized in a hydrolysis reactor using a carbonyl sulfur hydrolysis desulfurization catalyst, which reacts COS in the gas with water to convert it into H2S, and converts COS with a volume content of more than 85% in the blast furnace gas into hydrogen sulfide. 4) Use clean circulating water in the cooler to cool the blast furnace gas. After the temperature of the blast furnace gas drops to 45-60℃, it enters the pre-activated carbon desulfurization tank and the post-activated carbon desulfurization tank for deep desulfurization. Finally, it is sent to the pipeline network through the back-end main pipeline.

10. The method for fine desulfurization of coal gas by hydrolysis and activated carbon according to claim 9, characterized in that, The carbonyl sulfur hydrolysis catalyst mentioned in step 3) is prismatic in shape with a bulk density of 0.85–0.95 kg / m³. 3 The pre-activated carbon desulfurization tank and post-activated carbon desulfurization tank are filled with activated carbon desulfurizing agent, the bulk density of which is 0.48–0.58 kg / dm³. 3 Sulfur capacity ≥20%, carbon content ≥80%.

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