A coke oven gas purification system for reducing HPF desulfurization regeneration air consumption

Abstract

This invention relates to the technical field of coke oven gas purification equipment, specifically a coke oven gas purification system for reducing the amount of HPF desulfurization regeneration air used. The system includes: a regeneration tower, with a jet absorber assembly installed at the bottom and multiple bubble generators installed in the middle; the jet absorber assembly includes a double-layered pipe; a circulating pump passes through the mounting base and has a circulation port on its upper surface, with a pump impeller rotatably mounted inside the pump; the beneficial effects are: by installing the jet absorber assembly at the bottom of the regeneration tower, the desulfurization liquid and regeneration gas are mixed at high speed and turbulently, quickly completing the regeneration reaction. Combined with the forced circulation of the bubble generators, the overall height of the regeneration tower is reduced. A small portion of the exhaust gas discharged from the regeneration tower is sent to subsequent exhaust gas treatment, while the majority is used as desulfurization circulating gas, entering the circulating gas compressor and mixing with externally supplied compressed air before re-entering the regeneration tower for circulation, thereby reducing the amount of exhaust gas discharged and lowering the difficulty and cost of exhaust gas treatment.

Description

Technical Field

[0001] This invention relates to the technical field of coke oven gas purification equipment, specifically a coke oven gas purification system for reducing the amount of HPF desulfurization regeneration air required. Background Technology

[0002] The HPF method [H (hydroquinone), P (dinuclear titanium cobalt sulfonate ammonium sulfonate), F (ferrous sulfate)] for coke oven gas desulfurization and decyanation is a widely used wet oxidation method for coal gas desulfurization in China. To improve the desulfurization efficiency of the coal gas, two-stage desulfurization is generally used to ensure that the H2S content at the desulfurization outlet of the coal gas is controlled at 50 mg / m³. 3 the following.

[0003] In existing technologies, desulfurization regeneration towers use dispersed bubbling or nozzles to oxidize and regenerate the desulfurization liquid, and the treatment of regeneration tail gas generally employs methods such as acid washing, alkali washing, and adsorption.

[0004] However, currently, the gas-liquid mixing in the desulfurization regeneration tower is uneven, the regeneration reaction rate is slow, and gas-liquid flow deviation is prone to occur. Therefore, in order to increase the reaction time, the height of the desulfurization regeneration tower is relatively high (above 45 meters), and a large amount of waste gas is generated during the regeneration process, which is difficult to treat and has high equipment costs. To address these issues, this invention proposes a coke oven gas purification system for reducing the amount of air used in HPF desulfurization regeneration. Summary of the Invention

[0005] The purpose of this invention is to provide a coke oven gas purification system for reducing the amount of air used in HPF desulfurization regeneration, so as to solve the problems of high cost of coke oven gas desulfurization equipment and high difficulty in waste gas treatment mentioned in the background art.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a coke oven gas purification system for reducing the amount of HPF desulfurization regeneration air used, comprising:

[0007] The regeneration tower has a jet absorber assembly installed at its bottom and multiple bubble-combining machines installed in the middle of the regeneration tower, with the spacing between the multiple bubble-combining machines gradually increasing from bottom to top.

[0008] The jet absorber assembly includes a double-layer tube, which is configured as a double-layer structure. Multiple gas-liquid mixing tubes are arranged at equal intervals on the outer side of the double-layer tube, and both inner cavities of the double-layer tube are connected to the gas-liquid mixing tubes.

[0009] The bubble generator includes a mounting base fixed to the inner wall of the regeneration tower. The surface of the mounting base is provided with a bubble guide tube and a circulation pump. The inner cavity of the bubble guide tube is provided with a cutting mesh. The circulation pump passes through the mounting base and has a circulation port on its upper surface. The pump impeller is rotatably installed inside the circulation pump. The lower end of the circulation pump is connected to a guide bend and a bell mouth in sequence.

[0010] Preferably, the guide bend is bent vertically to form an "L" shape, the flared end is bent horizontally at an obtuse angle, and the upper opening of the circulation pump is covered with a top cover by bolts. A waterproof motor for driving the pump impeller is installed on the surface of the top cover.

[0011] Preferably, a shaft seat located in the inner cavity of the circulating pump is fixedly provided on the lower surface of the upper cover. A connecting shaft is rotatably mounted on the middle part of the shaft seat through a bearing. The lower end of the connecting shaft is fixedly connected to the pump impeller, and the upper end of the connecting shaft is drivenly connected to the output end of the waterproof motor through a coupling.

[0012] Preferably, one end of the double-layered tube penetrates the inner wall of the regeneration tower and extends to the outer side of the regeneration tower. The end of the double-layered tube is provided with a gas passage connector and a liquid passage connector. The gas passage connector communicates with the inner cavity of the double-layered tube, and the liquid passage connector communicates with the central inner cavity of the double-layered tube. Multiple double-layered tubes are provided and distributed at equal intervals. The lower end of the gas-liquid mixing tube is provided with a mixing chamber, and the lower end of the mixing chamber is connected to a liquid passage branch pipe. The liquid passage branch pipe penetrates the surface of the double-layered tube and communicates with the central inner cavity of the double-layered tube. The side of the mixing chamber is connected to a gas passage branch pipe, and the gas passage branch pipe communicates with the inner cavity of the double-layered tube.

[0013] Preferably, the bottom of the regeneration tower is fixedly connected to an alkali inlet pipe, and the upper side of the regeneration tower is connected to a level controller and a sulfur bubble discharge pipe. The level controller is provided with an overflow pipe that communicates with the inner cavity of the regeneration tower, and the outlet end of the overflow pipe and the outlet end of the sulfur bubble discharge pipe are at the same horizontal height.

[0014] Preferably, a circulating gas compressor is provided on the outside of the regeneration tower, an exhaust port is provided on the top of the regeneration tower and is connected to the air inlet of the circulating gas compressor through a pipe, and the air outlet of the circulating gas compressor is connected to the gas pipeline pipe.

[0015] Preferably, the regeneration tower is externally provided with a precooling tower, a desulfurization tower, a reaction tank, a foam tank, and a sulfur melting kettle. The precooling tower, desulfurization tower, reaction tank, regeneration tower, foam tank, and sulfur melting kettle are connected in sequence by pipelines. A circulating pipeline with reverse connection is provided between the reaction tank and the regeneration tower, and a connecting pipeline is provided between the sulfur melting kettle and the reaction tank.

[0016] Preferably, the precooling tower is filled with ammonia and coke oven gas, and a circulating precooling pump is installed at the top of the precooling tower. A catalyst is added to the reaction tank. The desulfurization circulating gas discharged from the top of the regeneration tower is mixed with compressed air by a circulating gas compressor and enters the inner cavity of the regeneration tower for circulation through a gas pipeline.

[0017] Preferably, the coke oven gas discharged from the desulfurization tower and the sulfur melting kettle is collected and fed into the precooling tower, and the desulfurization waste gas discharged from the top of the regeneration tower enters the subsequent tail gas treatment process.

[0018] Compared with the prior art, the beneficial effects of the present invention are:

[0019] This invention installs a jet absorber assembly at the bottom of the regeneration tower to mix the desulfurization liquid and regeneration gas at high speed and turbulent flow, thus quickly completing the regeneration reaction. Combined with the forced circulation of the bubble generator, the overall height of the regeneration tower is reduced. A small portion of the exhaust gas discharged from the regeneration tower is sent to subsequent exhaust gas treatment, while most of it is used as desulfurization circulating gas, enters the circulating gas compressor, mixes with externally supplied compressed air, and re-enters the regeneration tower for circulation. This reduces the amount of exhaust gas discharged, thereby reducing the difficulty and cost of exhaust gas treatment. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the coke oven gas treatment process of the present invention;

[0021] Figure 2 This is a half-sectional schematic diagram of the regeneration tower structure of the present invention;

[0022] Figure 3 This is a three-dimensional schematic diagram of the foaming machine structure of the present invention;

[0023] Figure 4 This is a three-dimensional schematic diagram of the circulating pump structure of the present invention;

[0024] Figure 5 This is a top view of the flared mouth structure of the present invention;

[0025] Figure 6 This is a half-sectional schematic diagram of the circulating pump structure of the present invention;

[0026] Figure 7 This is a three-dimensional schematic diagram of the jet absorber assembly structure of the present invention;

[0027] Figure 8 This is a schematic diagram of the gas-liquid mixing pipe structure of the present invention;

[0028] Figure 9 This is a front view of the gas-liquid mixing pipe structure of the present invention;

[0029] Figure 10 This is a schematic diagram illustrating the absorption reaction principle of the present invention;

[0030] Figure 11 This is a schematic diagram illustrating the catalytic desulfurization reaction principle of the present invention;

[0031] Figure 12 This is a schematic diagram illustrating the catalytic regeneration reaction principle of the present invention;

[0032] Figure 13This is a schematic diagram of the microbubble structure of the present invention.

[0033] In the diagram: 1. Regeneration tower; 2. Jet absorber assembly; 21. Double-layer pipe; 22. Gas connection pipe; 23. Liquid connection pipe; 24. Gas-liquid mixing pipe; 241. Mixing chamber; 242. Liquid branch pipe; 243. Gas branch pipe; 3. Bubble generator; 31. Mounting base; 32. Bubble guide pipe; 33. Cutting mesh; 34. Circulation pump; 341. Circulation port; 342. Pump impeller; 343. Shaft seat; 344. Connecting shaft; 345. Bearing; 35. Guide bend; 36. Trumpet mouth; 37. Top cover; 38. Waterproof motor; 4. Alkali inlet pipe; 5. Liquid level controller; 51. Overflow pipe; 6. Sulfur bubble discharge pipe. Detailed Implementation

[0034] To make the objectives, technical solutions, and advantages of the present invention clear and complete, the embodiments of the present invention will be further described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are only some, not all, embodiments of the present invention, and are merely illustrative of the embodiments of the present invention. They are not intended to limit the embodiments of the present invention. All other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0035] In the description of this invention, it should be noted that the terms "center," "middle," "upper," "lower," "left," "right," "inner," "outer," "top," "bottom," "side," "vertical," and "horizontal," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "a," "first," "second," "third," "fourth," "fifth," and "sixth" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0036] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0037] For purposes of simplicity and illustration, the principles of the embodiments are described primarily by way of example. In the following description, numerous specific details are set forth to provide a thorough understanding of the embodiments. However, it will be apparent to those skilled in the art that these embodiments may not be limited to these specific details in practice. In some instances, well-known methods and structures have not been described in detail to avoid unnecessarily obscuring these embodiments. Furthermore, all embodiments can be used in combination with each other.

[0038] Please see Figures 1 to 12 The present invention provides a technical solution:

[0039] Example 1: A coke oven gas purification system for reducing HPF desulfurization regeneration air consumption, comprising:

[0040] Regeneration tower 1, such as Figure 2 As shown, a jet absorber group 2 is installed at the bottom of the regeneration tower 1, and multiple bubble generators 3 are installed in the middle of the regeneration tower 1. The spacing between the multiple bubble generators 3 gradually increases from bottom to top. Alkali solution is left in the inner cavity of the regeneration tower 1 for reaction and regeneration with coke oven gas.

[0041] Among them, the jet absorber group 2 includes a double-layer tube 21, such as Figure 8 As shown, the double-layer tube 21 is configured with a double-layer structure. Multiple equally spaced gas-liquid mixing pipes 24 are arranged on the outer side of the double-layer tube 21. Both inner cavities of the double-layer tube 21 are connected to the gas-liquid mixing pipes 24. Sulfur-containing gas flows through the interlayer cavity of the double-layer tube 21, while desulfurization liquid flows through the central cavity. The desulfurization liquid and sulfur-containing gas undergo high-speed turbulent mixing inside the gas-liquid mixing pipes 24, generating a large number of fine bubbles which are then injected into the inner cavity of the regeneration tower 1, rapidly completing the regeneration reaction. The desulfurization regeneration reaction principle is as follows: Figure 10 , Figure 11 and Figure 12 As shown.

[0042] Furthermore, such as Figure 3 As shown, the bubble combiner 3 includes a mounting base 31 fixed to the inner wall of the regeneration tower 1. The surface of the mounting base 31 is provided with a bubble guide tube 32 and a circulation pump 34. The inner cavity of the bubble guide tube 32 is provided with a cutting net 33. The cutting net 33 allows bubbles to pass through the regeneration tower 1 from bottom to top. The circulation pump 34 passes through the mounting base 31 and has a circulation port 341 on its upper surface. The pump impeller 342 is rotatably installed inside the circulation pump 34. The lower end of the circulation pump 34 is connected to a guide bend 35 and a bell mouth 36 in sequence. The bubble combiner 3 allows the surrounding bubbles and liquid to circulate in a small space. Bubbles that are too large are broken up, and smaller bubbles combine with each other and mix the bubbles with the alkaline solution. The elemental sulfur generated in the liquid due to the reaction can fully contact and adhere to the bubbles, and then be carried away with the rising bubbles, thus realizing the flotation separation of elemental sulfur by the bubbles.

[0043] Furthermore, microbubbles are a key factor in the air flotation process. Air flotation requires the generation of a large number of well-dispersed microbubbles, and the ability to generate microbubbles that meet these requirements directly affects the quality of the air flotation effect; for example... Figure 13 As shown, under a microscope, it can be clearly seen that the surface film of the bubble is divided into two layers. The outer layer is more loosely arranged and is called the turbulent layer, while the inner layer is tightly arranged and is called the attachment layer. The outer film flows under the influence of gravity and resistance during the floating process and is called the flow layer. The inner film, together with the gas inside the bubble, forms a stable microbubble that floats. Under the action of van der Waals forces and hydrogen bonds, the inner film, which is composed of water molecules arranged in a directional and orderly manner, may be hydrophobic due to the weakening of polarity. Long-chain polymeric viscous substances in water can improve the toughness and strength of the bubble film.

[0044] Furthermore, the size and intensity of bubbles formed in water depend on the surface tension under various conditions when air is released. Due to the uneven forces acting on the surface molecules of a liquid, the liquid surface tends to shrink. Therefore, to form bubbles in water, the liquid surface area must be increased, which necessitates overcoming the force pulling the surface molecules into the liquid, requiring a certain amount of energy. This energy required to increase the liquid surface area is equal to the free energy gained by the surface molecules, called surface free energy. The calculation formula is: Es = αS, where α is the surface tension coefficient and S is the surface area.

[0045] Moreover, the finer the bubbles in water are broken down, the larger their specific surface area becomes, the more interfacial energy they possess, and the more unstable their thermodynamic properties become. Therefore, they tend to adsorb hydrophobic substances in water, thereby reducing their surface energy.

[0046] However, the bursting of bubbles is not caused by the impact of turbulent water flow or the local loss of the bubble membrane, leading to an imbalance of internal and external pressure. During violent impacts, bubbles deform, burst, and enlarge due to uneven stress on the bubble membrane. Adding long-chain polymers to the water can improve the toughness and strength of the bubble membrane. The longer the molecular chain, the greater the intermolecular attraction, resulting in a stronger membrane that is less prone to breakage. Similarly, the greater the viscosity and toughness of the polymer, the less likely the bubble membrane is to be lost, and the less likely the bubble is to burst. Both factors increase bubble stability, ensuring that sulfur, after adhering to the bubble surface, can float to the surface with the bubble, achieving air flotation separation.

[0047] In Example 2, based on Example 1, in order to cut the bubbles, the guide bend 35 of this application is bent vertically to form an "L" shape, and the flared opening 36 is bent horizontally at an obtuse angle, as shown below. Figure 3 and Figure 5As shown, the guide bend 35 and the flared mouth 36 work together to allow the gas and liquid discharged from the lower end of the circulating pump 34 to have a horizontal offset. When the bubbles enter the inner cavity of the bubble guide tube 32, a better cutting effect can be achieved, ensuring that large-volume bubbles are cut by the cutting net 33 and their volume is reduced. Small-volume bubbles are guided by the cutting net 33 and merge with other small bubbles, thereby ensuring that the volume of the bubbles is more uniform and stable. This avoids the unstable rupture of bubbles that are too large, which would cause sulfur to detach, and the limited amount of sulfur that can be adhered due to bubbles that are too small. In addition, a cover 37 is fixed to the upper opening of the circulating pump 34 by bolts. A waterproof motor 38 that drives the pump impeller 342 to rotate is installed on the surface of the cover 37. When the pump impeller 342 rotates, it can drive the gas and liquid in the inner cavity of the circulating pump 34 to flow from top to bottom and draw the gas and liquid on the upper side of the regeneration tower 1 into the inner cavity of the circulating pump 34 through the circulation port 341.

[0048] In embodiment three, based on embodiment two, this application further includes a shaft seat 343 fixedly disposed on the lower surface of the upper cover 37, located within the cavity of the circulating pump 34. A connecting shaft 344 is rotatably mounted on the middle of the shaft seat 343 via a bearing 345. The lower end of the connecting shaft 344 is fixedly connected to the pump impeller 342, and the upper end of the connecting shaft 344 is connected to the output end of the waterproof motor 38 via a coupling. Figure 6 As shown, the connecting shaft 344 is used to connect the output end of the waterproof motor 38 and the pump impeller 342, and the bearing 345 is provided to reduce the friction when the connecting shaft 344 rotates.

[0049] In Example 4, based on Example 3, one end of the double-layered tube 21 of this application penetrates the inner wall of the regeneration tower 1 and extends to the outside of the regeneration tower 1, as shown below. Figure 7 and Figure 8 As shown, the ends of the double-layer pipe 21 are provided with a gas passage connector 22 and a liquid passage connector 23. The gas passage connector 22 is connected to the inner cavity of the double-layer pipe 21, and the liquid passage connector 23 is connected to the central inner cavity of the double-layer pipe 21. Multiple double-layer pipes 21 are provided and distributed at equal intervals. The gas passage connector 22 sends external sulfur-containing gas into the inner cavity of the double-layer pipe 21, and the liquid passage connector 23 sends desulfurization liquid into the central inner cavity of the double-layer pipe 21. The lower end of the gas-liquid mixing pipe 24 is provided with a mixing chamber 241, and the lower end of the mixing chamber 241 is connected to a liquid passage connector. The liquid branch pipe 242 penetrates the surface of the double-layer pipe 21 and is connected to the central inner cavity of the double-layer pipe 21. The side of the mixing chamber 241 is connected to the gas branch pipe 243, which is connected to the interlayer inner cavity of the double-layer pipe 21. The desulfurization liquid is sent into the inner cavity of the mixing chamber 241 through the liquid branch pipe 242, and the sulfur-containing gas enters the inner cavity of the mixing chamber 241 through the gas branch pipe 243. The gas and liquid are mixed in the inner cavity of the mixing chamber 241 and then sprayed into the inner cavity of the regeneration tower 1 through the gas-liquid mixing pipe 24 for full reaction, thereby realizing desulfurization regeneration.

[0050] In Example 5, based on Example 4, in order to discharge elemental sulfur, this application further includes an alkali inlet pipe 4 fixedly connected to the bottom of the regeneration tower 1 for feeding alkali into the inner cavity of the regeneration tower 1 to ensure the normal implementation of the desulfurization regeneration reaction. A level controller 5 and a sulfur bubble discharge pipe 6 are connected to the upper side of the regeneration tower 1. The level controller 5 is equipped with an overflow pipe 51 connected to the inner cavity of the regeneration tower 1, and the outlet end of the overflow pipe 51 is at the same horizontal level as the outlet end of the sulfur bubble discharge pipe 6. Figure 1 As shown, the sulfur bubble discharge pipe 6 is used to remove the bubbles. Since elemental sulfur adheres to the bubbles, it can be separated. The level controller 5 and the overflow pipe 51 work together to control the liquid level in the regeneration tower 1, ensuring that the bubbles that float to the surface can be discharged from the sulfur bubble discharge pipe 6 in time, and that the liquid will not flow out of the sulfur bubble discharge pipe 6.

[0051] In Example 6, based on Example 5, in order to recycle the waste gas, this application further includes a recirculating gas compressor installed on the outside of the regeneration tower 1. The top of the regeneration tower 1 is provided with an exhaust port, which is connected to the air inlet of the recirculating gas compressor through a pipe. The air outlet of the recirculating gas compressor is connected to the gas pipeline 22. An exhaust port is left at the top of the regeneration tower 1 to discharge a small amount of waste gas, while most of the waste gas enters the recirculating gas compressor as desulfurization recirculating gas, mixes with the compressed air supplemented from the outside, and then re-enters the inner cavity of the regeneration tower 1 for desulfurization regeneration reaction.

[0052] Example 7, based on Example 6, further includes a precooling tower, a desulfurization tower, a reaction tank, a foam tank, and a sulfur melting kettle arranged outside the regeneration tower 1. The precooling tower, desulfurization tower, reaction tank, regeneration tower 1, foam tank, and sulfur melting kettle are sequentially connected by pipelines. A reverse-connecting circulation pipeline is provided between the reaction tank and the regeneration tower 1, and a connecting pipeline is provided between the sulfur melting kettle and the reaction tank. Figure 1 The coke oven gas treatment process shown in the figure involves first cooling the coke oven gas to a suitable temperature in a precooling tower, then sending it to a desulfurization tower for preliminary desulfurization, then adding a catalyst in a reaction tank, and finally sending it into the inner cavity of regeneration tower 1 for desulfurization and regeneration reaction. The reacted elemental sulfur is discharged from the inner cavity of regeneration tower 1 with the gas bubbles and collected in a foam tank, and then completely separated by a sulfur melting kettle.

[0053] Example 8, based on Example 7, further includes the following features: ammonia and coke oven gas are passed through the precooling tower, and a circulating precooling pump is installed at the top of the precooling tower to prevent the coke oven gas temperature from being too high and affecting the subsequent reaction; a catalyst is added to the reaction tank to improve the reaction efficiency of the desulfurization reaction; the desulfurization circulating gas discharged from the top of the regeneration tower 1 is mixed with compressed air by the circulating gas compressor and enters the inner cavity of the regeneration tower 1 through the gas pipeline 22 for circulation, reducing the generation of waste gas and allowing the sulfur-containing gas to be fully reacted.

[0054] Example 9: Based on Example 8, the desulfurization tower and sulfur melting kettle of this application discharge coke oven gas and collect it in a unified manner to add it to the precooling tower, thereby maximizing the treatment of coke oven gas. The desulfurization waste gas discharged from the top of the regeneration tower 1 enters the subsequent tail gas treatment process.

[0055] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A coke oven gas purification system for reducing the amount of HPF desulfurization regeneration air used, characterized in that: include: A regeneration tower (1) is provided with a jet absorber group (2) installed at the bottom of the regeneration tower (1) and a plurality of bubble combiners (3) installed in the middle of the regeneration tower (1), with the spacing between the plurality of bubble combiners (3) gradually increasing from bottom to top. The jet absorber group (2) includes a double-layer tube (21), which is configured as a double-layer structure. Multiple gas-liquid mixing tubes (24) are arranged at equal intervals on the outside of the double-layer tube (21). Both inner cavities of the double-layer tube (21) are connected to the gas-liquid mixing tubes (24). The bubble generator (3) includes a mounting base (31) fixed to the inner wall of the regeneration tower (1). The mounting base (31) is provided with a bubble conduit (32) and a circulation pump (34) on its surface. The bubble conduit (32) is provided with a cutting mesh (33) in its inner cavity. The circulation pump (34) passes through the mounting base (31) and has a circulation port (341) on its upper surface. The circulation pump (34) is rotatably mounted with a pump impeller (342) inside. The lower end of the circulation pump (34) is connected to a guide bend (35) and a bell mouth (36) in sequence. A circulating gas compressor is provided on the outside of the regeneration tower (1). An exhaust port is provided on the top of the regeneration tower (1) and is connected to the air inlet of the circulating gas compressor through a pipe. The air outlet of the circulating gas compressor is connected to the gas pipeline pipe (22). The regeneration tower (1) is equipped with a precooling tower, a desulfurization tower, a reaction tank, a foam tank and a sulfur melting kettle. The precooling tower, desulfurization tower, reaction tank, regeneration tower (1), foam tank and sulfur melting kettle are connected in sequence by pipelines. A circulating pipeline with reverse connection is provided between the reaction tank and the regeneration tower (1), and a connecting pipeline is provided between the sulfur melting kettle and the reaction tank. The precooling tower is filled with ammonia and coke oven gas, and a circulating precooling pump is installed at the top of the precooling tower. A catalyst is added to the reaction tank. The desulfurization circulating gas discharged from the top of the regeneration tower (1) is mixed with compressed air by the circulating gas compressor and enters the inner cavity of the regeneration tower (1) through the gas pipeline (22) for circulation.

2. A coke oven gas purification system for reducing HPF desulfurization regeneration air consumption according to claim 1, characterized in that: The guide bend (35) is bent vertically to form an "L" shape, the flared mouth (36) is bent horizontally at an obtuse angle, and the upper opening of the circulating pump (34) is covered with a cover (37) by bolts. A waterproof motor (38) that drives the pump impeller (342) to rotate is installed on the surface of the cover (37).

3. A coke oven gas purification system for reducing HPF desulfurization regeneration air consumption according to claim 2, characterized in that: The lower surface of the upper cover (37) is fixedly provided with a shaft seat (343) located in the inner cavity of the circulating pump (34). A connecting shaft (344) is rotatably mounted in the middle of the shaft seat (343) through a bearing (345). The lower end of the connecting shaft (344) is fixedly connected to the pump impeller (342), and the upper end of the connecting shaft (344) is connected to the output end of the waterproof motor (38) through a coupling.

4. A coke oven gas purification system for reducing HPF desulfurization regeneration air consumption according to claim 3, characterized in that: One end of the double-layer pipe (21) penetrates the inner wall of the regeneration tower (1) and extends to the outside of the regeneration tower (1). The end of the double-layer pipe (21) is provided with a gas pipe (22) and a liquid pipe (23). The gas pipe (22) is connected to the inner cavity of the double-layer pipe (21), and the liquid pipe (23) is connected to the central cavity of the double-layer pipe (21). Multiple double-layer pipes (21) are provided and are distributed at equal intervals. The lower end of the gas-liquid mixing pipe (24) is provided with a mixing chamber (241), and the lower end of the mixing chamber (241) is connected to a liquid branch pipe (242). The liquid branch pipe (242) penetrates the surface of the double-layer pipe (21) and is connected to the central cavity of the double-layer pipe (21). The side of the mixing chamber (241) is connected to a gas branch pipe (243), and the gas branch pipe (243) is connected to the inner cavity of the double-layer pipe (21).

5. A coke oven gas purification system for reducing HPF desulfurization regeneration air consumption according to claim 4, characterized in that: The bottom of the regeneration tower (1) is fixedly connected to an alkali inlet pipe (4), and the upper side of the regeneration tower (1) is connected to a liquid level controller (5) and a sulfur bubble discharge pipe (6). The liquid level controller (5) is provided with an overflow pipe (51) that is connected to the inner cavity of the regeneration tower (1), and the outlet end of the overflow pipe (51) and the outlet end of the sulfur bubble discharge pipe (6) are at the same horizontal height.

6. A coke oven gas purification system for reducing HPF desulfurization regeneration air consumption according to claim 5, characterized in that: The desulfurization tower and the sulfur melting kettle discharge coke oven gas and collect it in a unified manner to add it to the precooling tower. The top of the regeneration tower (1) discharges desulfurization waste gas into the subsequent tail gas treatment process.

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