Blast furnace gas desulfurization thermal coupling system

Abstract

The invention provides a blast furnace gas desulfurization thermal coupling system, and belongs to the technical field of blast furnace gas desulfurization. According to the blast furnace gas desulfurization thermal coupling system, a thermal coupling desulfurization tower is provided with a primary waste heat recovery bin and a desulfurization bin, a thermal coupling hydrolysis tower is provided with a secondary waste heat recovery bin and a hydrolysis bin, and an inlet of a gas heater is connected with a secondary pretreated gas outlet of the secondary waste heat recovery bin; an outlet of the coal gas heater is connected with a to-be-hydrolyzed coal gas inlet of the thermal coupling hydrolysis tower; the coal gas cooler is used for cooling coal gas to be desulfurized, an inlet of the coal gas cooler is connected with a hydrolyzed coal gas outlet of the thermal coupling hydrolysis tower, and an outlet of the coal gas cooler is connected with a coal gas inlet to be desulfurized of the thermal coupling desulfurization tower. According to the blast furnace gas desulfurization thermal coupling system, waste heat generated by gas desulfurization can be recycled, and energy consumption of blast furnace gas desulfurization is reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of blast furnace gas desulfurization, in particular to a blast furnace gas desulfurization heat coupling system. BACKGROUND

[0002] Blast furnace gas desulfurization is a key technology for steel industry to achieve clean production. The main forms of sulfur in blast furnace gas include hydrogen sulfide (H2S) and carbonyl sulfide (COS).

[0003] At present, carbonyl sulfide (COS) is removed by hydrolysis reaction first, and then hydrogen sulfide (H2S) is removed by desulfurization reaction. The blast furnace gas desulfurization system disclosed in the prior art comprises a pretreatment tower, a gas heater, a hydrolysis tower, a gas cooler and a desulfurization tower. The blast furnace gas after pretreatment is heated to meet the hydrolysis reaction conditions, and then the blast furnace gas after hydrolysis is cooled to meet the adsorption reaction conditions. The blast furnace gas after adsorption is sent to a user point or a gas storage device. In the above process, each reactor and heat exchange device is independently arranged, and the blast furnace gas purification is realized in series. There are problems of large occupied area and high energy consumption.

[0004] Patent CN 118813304 A discloses a blast furnace gas fine desulfurization unit and system, which comprises a washing tower, a gas heater, a hydrolysis tower, a gas cooler and a desulfurization tower connected in sequence. A heat exchanger is additionally arranged to exchange heat between the high-temperature gas after hydrolysis and the low-temperature gas before entering the gas heater, so as to realize the one-time heating of the low-temperature gas and the one-time cooling of the high-temperature gas after hydrolysis. That is, through the heat exchange between the high-temperature gas and the low-temperature gas, the heat energy is recycled in the system, thereby reducing the system energy consumption. However, the technical scheme still has the following problems:

[0005] Firstly, due to the large amount of blast furnace gas, the additional independent heat exchanger increases the system device occupied area, especially in the case of space shortage in the site of the transformation project. The heat coupling tower can be used to optimize the system heat energy recycling and reduce the heat exchanger heat load and equipment size, while recycling the heat energy and reducing the area occupied.

[0006] Secondly, the invention only recovers the heat of the high-temperature gas before the gas cooler after the hydrolysis tower through the additional heat exchanger.

[0007] Therefore, the present inventors, based on years of production and design experience in this field and related fields, have designed a blast furnace gas desulfurization heat coupling system through repeated tests, in order to solve the problems existing in the prior art. SUMMARY

[0008] The present application aims to provide a blast furnace gas desulfurization heat coupling system, which can recycle the waste heat generated by gas desulfurization and reduce the energy consumption of blast furnace gas desulfurization.

[0009] To achieve the above object, the present application provides a blast furnace gas desulfurization heat coupling system, wherein the blast furnace gas desulfurization heat coupling system comprises:

[0010] The heat coupling desulfurization tower is provided with a desulfurization gas inlet and a desulfurization gas outlet, and is provided with a primary waste heat recovery bin and a desulfurization bin inside, the desulfurization gas outlet is connected with the desulfurization bin, the primary waste heat recovery bin is provided with a primary hot fluid channel and a primary cold fluid channel for heat exchange, two ends of the primary hot fluid channel are connected with the desulfurization gas inlet and the desulfurization bin respectively, and two ends of the primary cold fluid channel are respectively provided with a primary pretreated gas inlet and a primary pretreated gas outlet;

[0011] The heat coupling hydrolysis tower is provided with a hydrolysis gas inlet and a hydrolysis gas outlet, and is provided with a secondary waste heat recovery bin and a hydrolysis bin inside, the hydrolysis gas inlet is connected with the hydrolysis bin, the secondary waste heat recovery bin is provided with a secondary hot fluid channel and a secondary cold fluid channel for heat exchange, two ends of the secondary cold fluid channel are respectively provided with a secondary pretreated gas inlet and a secondary pretreated gas outlet, the secondary pretreated gas inlet is connected with the primary pretreated gas outlet through a connecting pipeline, and two ends of the secondary hot fluid channel are respectively connected with the hydrolysis bin and the hydrolysis gas outlet;

[0012] The gas heater is used for heating the hydrolysis gas, the inlet of the gas heater is connected with the secondary pretreated gas outlet, and the outlet of the gas heater is connected with the hydrolysis gas inlet.

[0013] The gas cooler is used for cooling the desulfurization gas, the inlet of the gas cooler is connected with the hydrolysis gas outlet, and the outlet of the gas cooler is connected with the desulfurization gas inlet.

[0014] Compared with the prior art, the present application has the following characteristics and advantages:

[0015] The blast furnace gas desulfurization heat coupling system provided by the present application can recover heat from the high-temperature gas after hydrolysis through the primary waste heat recovery bin and the secondary waste heat recovery bin, and use the recovered heat to heat the hydrolysis gas, so that the heat load of the gas heater and the cold load of the gas cooler can be reduced at the same time, the heat coupling desulfurization tower and the heat coupling hydrolysis tower are respectively integrated with the heat coupling structure design, which optimizes the equipment layout, greatly reduces the number of independent external heat exchangers and the occupied area, and improves the space utilization rate. BRIEF DESCRIPTION OF DRAWINGS

[0016] The drawings described herein are for purposes of illustration only and are not intended to limit the scope of the present disclosure in any way. Additionally, the shapes and proportions of the various components depicted in the drawings are not intended to be specific, but rather are provided as illustrative examples for the purpose of understanding the present invention. Those skilled in the art will recognize that various modifications can be made to the shapes and proportions of the various components without departing from the scope of the present invention.

[0017] Figure 1 Structure diagram of the blast furnace gas desulfurization heat coupling system of the present application;

[0018] Figure 2 Sectional view of the primary waste heat recovery pipe group of the blast furnace gas desulfurization heat coupling system of the present application;

[0019] Figure 3 Sectional view of the secondary waste heat recovery pipe group of the blast furnace gas desulfurization heat coupling system of the present application.

[0020] Legend of reference numerals

[0021] 1. Blast furnace gas pretreatment system; 2. Gas holder or user;

[0022] 3. Connection pipeline 6. Connection valve;

[0023] 7. Desulfurized gas pipeline; 8. Secondary pretreatment valve;

[0024] 9. Primary pretreatment valve; 10. Heat coupling desulfurization tower;

[0025] 11. Desulfurization bin; 12. Primary waste heat recovery lower tray;

[0026] 13. Primary waste heat recovery bin; 14. Primary waste heat recovery upper tray;

[0027] 15. Primary waste heat recovery pipe group; 20. Heat coupling hydrolysis tower;

[0028] 21. Hydrolysis bin; 22. Secondary waste heat recovery lower tray;

[0029] 23. Secondary waste heat recovery bin; 24. Secondary waste heat recovery upper tray;

[0030] 25. Secondary waste heat recovery pipe group; 30. Gas cooler;

[0031] 40. Gas heater; 100. Blast furnace gas desulfurization heat coupling system. DETAILED DESCRIPTION

[0032] The details of the application can be more clearly understood in conjunction with the description of the drawings and the specific embodiments of the application. However, the specific embodiments of the application described herein are for the purpose of explaining the application only, and should not be understood as limiting the application in any way. Based on the teachings of the application, a skilled person can conceive any possible modification of the application, which should be considered as falling within the scope of the application.

[0033] As shown in Figure 1 The present application provides a blast furnace gas desulfurization heat coupling system, wherein the blast furnace gas desulfurization heat coupling system 100 comprises:

[0034] The heat coupling desulfurization tower 10 is provided with a desulfurization gas inlet and a desulfurization gas outlet, and is provided with a primary waste heat recovery bin 13 and a desulfurization bin 11 inside, the desulfurization gas outlet is connected with the desulfurization bin 11, the primary waste heat recovery bin 13 has a primary hot fluid channel and a primary cold fluid channel for heat exchange, the two ends of the primary hot fluid channel are connected with the desulfurization gas inlet and the desulfurization bin 11 respectively, and the two ends of the primary cold fluid channel are provided with a primary pretreated gas inlet and a primary pretreated gas outlet respectively;

[0035] The heat coupling hydrolysis tower 20 is provided with a hydrolysis gas inlet and a hydrolysis gas outlet, and is provided with a secondary waste heat recovery bin 23 and a hydrolysis bin 21 inside, the hydrolysis gas inlet is connected with the hydrolysis bin 21, the secondary waste heat recovery bin 23 has a secondary hot fluid channel and a secondary cold fluid channel for heat exchange, the two ends of the secondary cold fluid channel are provided with a secondary pretreated gas inlet and a secondary pretreated gas outlet respectively, the secondary pretreated gas inlet is connected with the primary pretreated gas outlet through a connecting pipeline 3, and the two ends of the secondary hot fluid channel are connected with the hydrolysis bin 21 and the hydrolysis gas outlet respectively;

[0036] The gas heater 40 is used for heating the hydrolysis gas, the inlet of the gas heater 40 is connected with the secondary pretreated gas outlet, and the outlet of the gas heater 40 is connected with the hydrolysis gas inlet;

[0037] The gas cooler 30 is used for cooling the desulfurization gas, the inlet of the gas cooler 30 is connected with the hydrolysis gas outlet, and the outlet of the gas cooler 30 is connected with the desulfurization gas inlet.

[0038] The blast furnace gas desulfurization heat coupling system provided by the present application embeds the primary waste heat recovery bin into the desulfurization tower and embeds the secondary waste heat recovery bin into the hydrolysis tower, so that the high-temperature gas after hydrolysis and the gas to be hydrolyzed are continuously heat-exchanged, thereby simultaneously reducing the heat load of the gas heater 40 and the gas cooler 30, making the heat energy utilization of the blast furnace gas desulfurization heat coupling system more sufficient, occupying less space, and the overall energy consumption and space occupation are superior to the prior art.

[0039] In an alternative embodiment of the present application, the primary waste heat recovery bin 13 is a shell-and-tube heat exchanger, the tube side of which is the primary hot fluid passage, and the shell side of which is the primary cold fluid passage. The hydrolyzed coal gas flows through the primary hot fluid passage, and the coal gas to be hydrolyzed flows through the primary cold fluid passage, so that the heat of the hydrolyzed high-temperature coal gas is exchanged to the low-temperature coal gas to be hydrolyzed, thereby achieving heat recovery of the hydrolyzed high-temperature coal gas. Furthermore, the primary waste heat recovery bin 13 and the desulfurization bin 11 are integrated in the heat-coupled desulfurization tower 10, so that an independent external heat exchanger is eliminated and the equipment footprint is reduced by virtue of the integrated structural design.

[0040] In an alternative example of this embodiment, the primary waste heat recovery bin 13 is located above the desulfurization bin 11, the inlet of the desulfurized coal gas is provided at the top of the heat-coupled desulfurization tower 10, and the outlet of the desulfurized coal gas is provided at the bottom of the heat-coupled desulfurization tower 10.

[0041] In an alternative example, the primary waste heat recovery bin 13 is composed of a primary waste heat recovery upper tray 14, a primary waste heat recovery tube group 15, and a primary waste heat recovery lower tray 12. The primary waste heat recovery upper tray 14 is horizontally arranged and is sealingly and fixedly connected to the upper tower wall of the heat-coupled desulfurization tower 10 at the outer edge thereof. The primary waste heat recovery lower tray 12 is located below the primary waste heat recovery upper tray 14 with a spacing therebetween and is also horizontally arranged and sealingly and fixedly connected to the upper tower wall of the heat-coupled desulfurization tower 10 at the outer edge thereof. The primary waste heat recovery upper tray 14, the primary waste heat recovery lower tray 12, and the upper tower wall of the heat-coupled desulfurization tower 10 form an enclosed area. The primary waste heat recovery tube group 15 is arranged between the primary waste heat recovery upper tray 14 and the primary waste heat recovery lower tray 12. The primary waste heat recovery tube group 15 is composed of a plurality of stainless steel pipes arranged in a cylindrical array heat exchange structure, and the upper and lower ends thereof are sealingly connected to the primary waste heat recovery upper tray 14 and the primary waste heat recovery lower tray 12, respectively.

[0042] Further, the interior of the stainless steel pipes of the primary waste heat recovery tube group 15 is the primary hot fluid passage, through which the high-temperature coal gas to be desulfurized after hydrolysis passes. The space outside the stainless steel pipes is the primary cold fluid passage, through which the low-temperature coal gas to be hydrolyzed passes and is heated by the high-temperature coal gas.

[0043] Preferably, the primary waste heat recovery upper tray 14 and the primary waste heat recovery lower tray 12 are made of stainless steel or carbon steel with a corrosion-resistant coating.

[0044] In operation, the high-temperature coal gas after hydrolysis enters from the desulfurization-ready coal gas inlet at the top of the heat-coupled desulfurization tower 10, flows through the primary hot fluid passage for secondary cooling, and then enters the desulfurization chamber 11. After desulfurization is completed in the desulfurization chamber 11, the desulfurized coal gas is discharged from the desulfurized coal gas outlet at the bottom. At the same time, the coal gas that needs to be desulfurized after pre-treatment enters the primary cold fluid passage and exchanges heat with the desulfurized coal gas after hydrolysis to be heated.

[0045] In this example, the primary waste heat recovery chamber 13 is located above the desulfurization chamber 11. The design can cooperate with the desulfurization-ready coal gas inlet at the top and the desulfurized coal gas outlet at the bottom to form a top-down flow path for the desulfurization-ready coal gas in the heat-coupled desulfurization tower 10. This ensures the continuous heat exchange and desulfurization process between the primary waste heat recovery chamber 13 and the desulfurization chamber 11. By arranging the waste heat recovery and desulfurization functions in the same tower, the land occupation of the heat-coupled desulfurization tower 10 is saved.

[0046] In an optional embodiment of the present application, the primary pre-treatment coal gas inlet is connected to the blast furnace coal gas pre-treatment system 1 through a primary pre-treatment coal gas pipeline. A primary pre-treatment valve 9 is arranged on the primary pre-treatment coal gas pipeline. The coal gas that needs to be desulfurized after pre-treatment of the blast furnace coal gas pre-treatment system 1 adjusts the flow through the primary pre-treatment valve 9, and then enters the primary waste heat recovery chamber 13 from the primary pre-treatment coal gas inlet. The coal gas exchanges heat with the hydrolyzed coal gas in the tube for the first time, and then continues to flow to the secondary waste heat recovery chamber 23 to realize continuous preheating and flow control. The primary pre-treatment valve 9 adjusts the flow of the coal gas entering the primary waste heat recovery chamber 13 to ensure the stability of the heat exchange conditions between the shell-side coal gas and the tube-side coal gas.

[0047] In an optional embodiment of the present application, the secondary waste heat recovery chamber 23 is also a tube-and-shell heat exchanger. The tube-side of the tube-and-shell heat exchanger is the secondary hot fluid passage, and the shell-side of the tube-and-shell heat exchanger is the secondary cold fluid passage. The hydrolyzed high-temperature coal gas flows in the secondary hot fluid passage, and the low-temperature coal gas that needs to be hydrolyzed flows in the secondary cold fluid passage to realize the second heat recovery.

[0048] In an optional example of this embodiment, the secondary waste heat recovery chamber 23 is located above the hydrolysis chamber 21. The desulfurization-ready coal gas inlet is arranged at the bottom of the heat-coupled hydrolysis tower 20, and the desulfurized coal gas outlet is arranged at the top of the heat-coupled hydrolysis tower 20.

[0049] In an optional example, the secondary waste heat recovery chamber 23 is composed of a secondary waste heat recovery upper tower tray 24, a secondary waste heat recovery tube group 25, and a secondary waste heat recovery lower tower tray 22. The secondary waste heat recovery chamber 23 is vertically located directly above the hydrolysis chamber 21.

[0050] The secondary waste heat recovery upper tray 24 is horizontally arranged, and the outer edge of the secondary waste heat recovery upper tray 24 is sealingly and fixedly connected with the upper tower wall of the thermally coupled hydrolysis tower 20. The secondary waste heat recovery lower tray 22 is located below the primary waste heat recovery upper tray and has a spacing. The secondary waste heat recovery lower tray 22 is also horizontally arranged, and the outer edge thereof is also sealingly and fixedly connected with the upper tower wall of the thermally coupled desulfurization tower 10. The secondary waste heat recovery upper tray 24, the secondary waste heat recovery lower tray 22 and the upper tower wall of the thermally coupled hydrolysis tower 20 form an enclosed area. The secondary waste heat recovery pipe group 25 is arranged between the secondary waste heat recovery upper tray 24 and the secondary waste heat recovery lower tray 22. The secondary waste heat recovery pipe group 25 is composed of a plurality of stainless steel pipes arranged in a cylindrical array heat exchange structure, and the upper and lower ends thereof are sealingly connected with the secondary waste heat recovery upper tray 24 and the secondary waste heat recovery lower tray 22 respectively.

[0051] Preferably, the secondary waste heat recovery upper tray 24 and the secondary waste heat recovery lower tray 22 are made of stainless steel or carbon steel with a corrosion-resistant coating.

[0052] In operation, the coal gas to be hydrolyzed enters the hydrolysis chamber 21 from the hydrolysis gas inlet at the bottom of the thermally coupled hydrolysis tower 20, and after the hydrolysis reaction is completed from bottom to top, high-temperature coal gas is generated and flows upward into the secondary heat fluid passage. At the same time, the coal gas to be hydrolyzed enters the secondary cold fluid passage and exchanges heat with the high-temperature coal gas in the pipe passage in a reverse direction. Finally, the high-temperature coal gas after the first cooling is discharged from the hydrolysis gas outlet at the top.

[0053] In the example, the secondary waste heat recovery chamber 23 is arranged above the hydrolysis chamber 21, which can cooperate with the gas inlet at the bottom and the gas outlet at the top to form a continuous flow path from bottom to top, thereby realizing the function integration of the hydrolysis reaction and the waste heat recovery.

[0054] In an optional embodiment of the present application, the secondary pretreated gas inlet is also connected with the blast furnace gas pretreatment system 1 through a secondary pretreated gas pipeline, and a secondary pretreated valve 8 is arranged on the secondary pretreated gas pipeline.

[0055] In an optional example, the coal gas to be hydrolyzed and desulfurized flowing out of the blast furnace gas pretreatment system 1 can be first heated in the primary waste heat recovery chamber 13 and then heated again in the secondary waste heat recovery chamber 23, thereby realizing the continuous two-time heating of the coal gas to be hydrolyzed and desulfurized.

[0056] In another optional example, the coal gas to be hydrolyzed and desulfurized flowing out of the blast furnace gas pretreatment system 1 has a high temperature and does not need to be heated twice. Therefore, the primary pretreated valve 9 is closed, the secondary pretreated valve 8 is opened, and the coal gas to be hydrolyzed and desulfurized is only heated once in the secondary waste heat recovery chamber 23.

[0057] Furthermore, a connecting valve 6 is installed on the connecting pipe 3 between the secondary pre-treated gas inlet and the primary pre-treated gas outlet.

[0058] In an optional embodiment of the present invention, the desulfurized gas outlet is connected to the gas holder or user 2 via the desulfurized gas pipeline 7. The gas that has undergone desulfurization in the desulfurization chamber 11 enters the desulfurized gas pipeline 7 through the desulfurized gas outlet at the bottom of the thermally coupled desulfurization tower 10, and is then sent to the gas holder or user 2, so that the purified blast furnace gas can be stored or directly used as needed, ensuring the effective connection between the entire desulfurization system and subsequent links.

[0059] In an optional embodiment of the present invention, the hydrolysis chamber 21 is filled with hydrolysis material, and the desulfurization chamber 11 is filled with desulfurization material. When the gas passes through the hydrolysis chamber 21 from bottom to top, it comes into contact with the hydrolysis material, converting organic sulfur into hydrogen sulfide. The gas then enters the desulfurization chamber 11 and reacts with the desulfurization material to remove the hydrogen sulfide, achieving continuous purification. The hydrolysis material and the desulfurization material are respectively fixed in their respective chambers, forming a stable reaction zone, ensuring efficient and continuous hydrolysis and desulfurization processes, and simplifying the device structure.

[0060] In one alternative embodiment of this implementation, the hydrolysis chamber 21 can be designed as a radial flow structure or an axial flow structure according to the hydrolysis requirements. The hydrolysis material can be filled in a single layer or multiple layers inside the hydrolysis chamber 21. The hydrolysis material can be selected from materials that can be repeatedly recycled or non-renewable materials that need to be replaced periodically, depending on the characteristics of the material itself.

[0061] In one alternative embodiment of this implementation, the desulfurization chamber 11 can be designed as a radial flow structure or an axial flow structure according to the desulfurization needs. The desulfurization material can be filled in a single layer or multiple layers inside the desulfurization chamber 11. The desulfurization material can be selected from materials that can be repeatedly recycled or non-renewable materials that need to be replaced periodically, depending on the characteristics of the material itself.

[0062] Now combined Figures 1 to 3 This invention provides a detailed explanation of the specific implementation principle and implementation principle of the blast furnace gas desulfurization thermal coupling system 100 proposed in this invention.

[0063] In this embodiment, the blast furnace gas desulfurization thermal coupling system 100 is located after the TRT (Total Refrigerant Response System). The blast furnace gas is processed by the blast furnace gas pretreatment system 1 and then sent to the blast furnace gas desulfurization thermal coupling system 100. The blast furnace gas pressure and flow rate entering the blast furnace gas desulfurization thermal coupling system 100 is 130,000 to 286,000 Nm³. 3 / h, pressure 10~22kPa, temperature 25~75℃.

[0064] 1. High-temperature operating conditions (blast furnace gas temperature > 40℃)

[0065] When the temperature of the blast furnace gas is greater than 40°C, the primary pretreatment valve 9 and the connecting valve 6 are closed, the secondary pretreatment valve 8 is opened, the blast furnace gas enters the bypass pipeline and enters the shell side of the secondary waste heat recovery bin 23 of the heat-coupled hydrolysis tower 20, exchanges heat with the high-temperature blast furnace gas in the tube side of the secondary waste heat recovery bin 23 at 80-120°C, the shell side gas is heated to about 60°C, and is discharged from the bottom outlet of the secondary waste heat recovery bin 23 and sent to the gas heater 40 to be heated to 80-120°C. The gas discharged from the outlet of the gas heater 40 enters the hydrolysis bin 21 through the lower inlet of the heat-coupled hydrolysis tower 20, flows from bottom to top through the hydrolysis bin 21 to complete the organic sulfur hydrolysis reaction, and is then sent to the tube side of the secondary waste heat recovery bin 23 to exchange heat with the low-temperature gas in the shell side, and is cooled to 60-100°C and discharged from the top of the tower, sent to the gas cooler 30 to be cooled to less than 40°C, and then sent to the heat-coupled desulfurization tower 10, enters the desulfurization bin 11 from top to bottom through the primary waste heat recovery bin 13, and completes desulfurization from top to bottom in the desulfurization bin 11, and is then sent to the gas storage device or user point through the bottom outlet.

[0066] 2. Low-temperature working condition (temperature of blast furnace gas < 40°C)

[0067] When the temperature of the blast furnace gas is less than 40°C, the primary pretreatment valve 9 and the connecting valve 6 are opened, the secondary pretreatment valve 8 is closed, the blast furnace gas enters the shell side of the primary waste heat recovery bin 13 of the heat-coupled desulfurization tower 10, exchanges heat with the high-temperature blast furnace gas in the tube side of the primary waste heat recovery bin 13 at 50-70°C, the shell side gas is heated to about 60°C, and is discharged from the bottom of the primary waste heat recovery bin 13, enters the shell side of the secondary waste heat recovery bin 23 of the heat-coupled hydrolysis tower 20, exchanges heat with the high-temperature blast furnace gas in the tube side of the secondary waste heat recovery bin 23 at 80-120°C, is heated to about 70°C, and is discharged from the bottom outlet of the secondary waste heat recovery bin 23 and sent to the gas heater 40 to be heated to 80-120°C. The gas discharged from the outlet of the gas heater 40 enters the hydrolysis bin 21 through the lower inlet of the heat-coupled hydrolysis tower 20, flows from bottom to top through the hydrolysis bin 21 to complete the organic sulfur hydrolysis reaction, and is then sent to the tube side of the secondary waste heat recovery bin 23 to exchange heat with the low-temperature gas in the shell side, and is cooled to 60-100°C and discharged from the top of the tower, sent to the gas cooler 30 to be cooled to 50-70°C, and then sent to the heat-coupled desulfurization tower 10, enters the desulfurization bin 11 from top to bottom through the primary waste heat recovery bin 13, and completes desulfurization from top to bottom in the desulfurization bin 11, and is then sent to the gas storage device or user point through the bottom outlet.

[0068] The above detailed description of the embodiments is only intended to explain the present application, so that the present application can be better understood, but these descriptions cannot be interpreted as limiting the present application in any way, and in particular, the features described in different embodiments can be arbitrarily combined with each other to form other embodiments, and these features should be understood as being applicable to any one embodiment, and not limited to the described embodiments, except for the explicitly opposite description.

Claims

1. A thermal coupling system for desulfurization of blast furnace gas, characterized in that, The blast furnace gas desulfurization thermal coupling system includes: A thermally coupled desulfurization tower is provided with an inlet for the gas to be desulfurized and an outlet for the desulfurized gas. The thermally coupled desulfurization tower is provided with a primary waste heat recovery chamber and a desulfurization chamber. The outlet for the desulfurized gas is connected to the desulfurization chamber. The primary waste heat recovery chamber has a primary hot fluid channel and a primary cold fluid channel for heat exchange. The two ends of the primary hot fluid channel are respectively connected to the inlet for the gas to be desulfurized and the desulfurization chamber. The two ends of the primary cold fluid channel are respectively provided with a primary pretreated gas inlet and a primary pretreated gas outlet. A thermally coupled hydrolysis tower is provided with an inlet for coal gas to be hydrolyzed and an outlet for hydrolyzed coal gas. The thermally coupled hydrolysis tower is provided with a secondary waste heat recovery chamber and a hydrolysis chamber. The inlet for coal gas to be hydrolyzed is connected to the hydrolysis chamber. The secondary waste heat recovery chamber has a secondary hot fluid channel and a secondary cold fluid channel for heat exchange. The two ends of the secondary cold fluid channel are respectively provided with a secondary pretreated coal gas inlet and a secondary pretreated coal gas outlet. The secondary pretreated coal gas inlet is connected to the primary pretreated coal gas outlet through a connecting pipe. The two ends of the secondary hot fluid channel are respectively connected to the hydrolysis chamber and the hydrolyzed coal gas outlet. A gas heater is used to heat the gas to be hydrolyzed. The inlet of the gas heater is connected to the outlet of the secondary pretreated gas, and the outlet of the gas heater is connected to the inlet of the gas to be hydrolyzed. A gas cooler is used to cool the gas to be desulfurized. The inlet of the gas cooler is connected to the outlet of the hydrolyzed gas, and the outlet of the gas cooler is connected to the inlet of the gas to be desulfurized.

2. The blast furnace gas desulfurization thermal coupling system as described in claim 1, characterized in that, The primary waste heat recovery chamber is a shell-and-tube heat exchanger, with the tube side serving as the primary hot fluid passage and the shell side serving as the primary cold fluid passage.

3. The blast furnace gas desulfurization thermal coupling system as described in claim 2, characterized in that, The primary waste heat recovery chamber is located above the desulfurization chamber, the inlet of the gas to be desulfurized is located at the top of the thermally coupled desulfurization tower, and the outlet of the desulfurized gas is located at the bottom of the thermally coupled desulfurization tower.

4. The blast furnace gas desulfurization thermal coupling system as described in claim 1, characterized in that, The secondary waste heat recovery chamber is a shell-and-tube heat exchanger, with the tube side serving as the secondary hot fluid channel and the shell side serving as the secondary cold fluid channel.

5. The blast furnace gas desulfurization thermal coupling system as described in claim 4, characterized in that, The secondary waste heat recovery chamber is located above the hydrolysis chamber, the inlet of the gas to be hydrolyzed is located at the bottom of the thermally coupled hydrolysis tower, and the outlet of the hydrolyzed gas is located at the top of the thermally coupled hydrolysis tower.

6. The blast furnace gas desulfurization thermal coupling system as described in claim 5, characterized in that, The primary pre-treated gas inlet is connected to the blast furnace gas pre-treatment system via a primary pre-treated gas pipeline, and a primary pre-treatment valve is installed on the primary pre-treated gas pipeline.

7. The blast furnace gas desulfurization thermal coupling system as described in claim 6, characterized in that, The secondary pre-treated gas inlet is also connected to the blast furnace gas pre-treatment system via a secondary pre-treated gas pipeline, and a secondary pre-treatment valve is installed on the secondary pre-treated gas pipeline.

8. The blast furnace gas desulfurization thermal coupling system as described in claim 1, characterized in that, A connecting valve is installed on the connecting pipe.

9. The blast furnace gas desulfurization thermal coupling system as described in claim 1, characterized in that, The desulfurized gas outlet is connected to the gas holder or user via a desulfurized gas pipeline.

10. The blast furnace gas desulfurization thermal coupling system as described in claim 1, characterized in that, The hydrolysis chamber is filled with hydrolysis materials, and the desulfurization chamber is filled with desulfurization materials.

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