Coke oven gas desulfurization tower

Abstract

A coke oven gas desulfurization tower, comprising a cylinder, a gas distributor and a reaction bed, the top of the cylinder is fixedly provided with the gas distributor, two reaction beds are arranged in the cylinder from top to bottom, a gas distribution cavity is arranged between the upper reaction bed and the top of the cylinder, the gas distributor is used for uniformly distributing the coke oven gas on the cross section of the cylinder, the uniformly distributed coke oven gas passes through the two reaction beds from top to bottom in turn, the chemical adsorbent arranged in the upper reaction bed is a high dechlorination agent, the chemical adsorbent arranged in the lower reaction bed is a zinc oxide desulfurizer, and the coke oven gas is desulfurized and dechlorinated under the action of the high dechlorination agent and the zinc oxide desulfurizer. The design can not only make the coke oven gas fully contact with the high dechlorination agent and the zinc oxide desulfurizer through the gas distributor, effectively improve the desulfurization efficiency, but also prolong the contact time of the coke oven gas and the chemical adsorbent, effectively reduce the equipment volume.

Description

Technical Field

[0001] This invention relates to a desulfurization tower, and more particularly to a coke oven gas desulfurization tower. Background Technology

[0002] Coke oven gas, a byproduct of iron and steel smelting and coking industries, is a good feedstock for the synthesis of methanol, ammonia, and hydrogen. However, it contains high concentrations of impurities such as hydrogen sulfide, organic sulfur compounds, and chlorides. These impurities not only corrode production equipment and poison catalysts but also cause environmental pollution. Therefore, coke oven gas must undergo deep purification before it can be utilized as a resource.

[0003] Existing coke oven gas desulfurization typically employs a two-stage series desulfurization process using the HPF method, which utilizes GLT complexed iron desulfurization catalysts to convert hydrogen sulfide into elemental sulfur and water through redox reactions.

[0004] Although this type of desulfurization tower can be used for coke oven gas desulfurization, it still has the following drawbacks:

[0005] 1. The desulfurization reaction depends on the diffusion of hydrogen sulfide from the gas phase to the liquid phase. The specific surface area of ​​traditional packed towers is limited, resulting in low desulfurization efficiency.

[0006] 2. Due to the low mass transfer efficiency of a single tower, the HPF two-stage series desulfurization process often requires multiple desulfurization towers and regeneration towers, resulting in a large equipment volume.

[0007] The information disclosed in this background section is intended only to enhance understanding of the overall background of this application and should not be construed as an admission or in any way implying that the information constitutes prior art known to those skilled in the art. Summary of the Invention

[0008] The purpose of this invention is to overcome the shortcomings of low desulfurization efficiency and large equipment size in the existing technology, and to provide a coke oven gas desulfurization tower with high desulfurization efficiency and small equipment size.

[0009] To achieve the above objectives, the technical solution of the present invention is:

[0010] A desulfurization tower for coke oven gas, wherein the desulfurization tank comprises: a cylinder, a gas distributor, and a reaction bed;

[0011] The cylinder is a closed vertical cylindrical structure. A gas distributor is fixedly installed at the top of the cylinder, and an exhaust pipe is installed at the bottom of the cylinder.

[0012] The reaction bed is disposed inside the cylinder, and a chemical adsorbent is disposed inside the reaction bed;

[0013] The gas distributor is used to distribute coke oven gas evenly across the cross-section of the cylinder. As the coke oven gas passes through the cylinder, it undergoes desulfurization and dechlorination under the action of a chemical adsorbent.

[0014] The cylinder contains two reaction beds arranged from top to bottom. The upper reaction bed contains a high-efficiency dechlorination agent as the chemical adsorbent, while the lower reaction bed contains a zinc oxide desulfurization agent as the chemical adsorbent.

[0015] The gas distribution chamber is located between the upper reaction bed and the top of the cylinder, and the maintenance chamber is located between the two reaction beds. Manholes are provided on the side walls of both the gas distribution chamber and the maintenance chamber.

[0016] The reaction bed includes a bottom support device and a top limiting device, and a chemical adsorbent is filled between the bottom support device and the top limiting device.

[0017] The bottom support device includes a support grid plate, a bottom stainless steel wire mesh, multiple fire-resistant balls, multiple I-beams, and multiple supports. The multiple supports are evenly distributed on the inner wall of the cylinder along the circumferential direction. The multiple I-beams are fixedly installed on the top of each support. The support grid plate is fixedly installed on the top of each I-beam. The outer edge of the support grid plate is in contact with the inner wall of the cylinder. The bottom stainless steel wire mesh is installed directly above the support grid plate. The outer edge of the bottom stainless steel wire mesh is fixedly connected to the inner wall of the cylinder. The space between the bottom stainless steel wire mesh and the support grid plate is filled with multiple fire-resistant balls.

[0018] The top limiting device includes fire-resistant balls, a limiting grid plate, and a top stainless steel wire mesh. The outer edge of the limiting grid plate is fixedly connected to the inner wall of the cylinder. A top stainless steel wire mesh is provided directly above the limiting grid plate. The outer edge of the top stainless steel wire mesh is fixedly connected to the inner wall of the cylinder. The space between the top stainless steel wire mesh and the limiting grid plate is filled with multiple fire-resistant balls.

[0019] The bottom support device includes two layers of bottom stainless steel wire mesh with the mesh of the two layers of bottom stainless steel wire mesh arranged in an alternating pattern. The top limiting device includes two layers of top stainless steel wire mesh with the mesh of the two layers of top stainless steel wire mesh arranged in an alternating pattern.

[0020] The reaction bed also includes multiple thermometers, which are evenly arranged from top to bottom between the bottom support device and the top limiting device.

[0021] The signal output end of the thermometer passes through the side wall of the cylinder and is fixedly connected to the cylinder. The contact medium end of the thermometer is inserted into the chemical adsorbent and is set on the central axis of the reaction bed.

[0022] The exhaust pipe is installed horizontally on the cylinder, and the inside of the cylinder is connected to the outside through the exhaust pipe. The air inlet of the exhaust pipe is an anti-falling inclined port, and the inlet of the exhaust pipe has an inclination angle of 45 degrees.

[0023] The bottom of the cylinder is fixedly provided with a skirt-type support, the top of the cylinder is fixedly provided with a tower top hanging column, the inner wall of the cylinder is uniformly provided with a heat insulation layer, and the outer wall of the cylinder is uniformly provided with multiple heat insulation rings from top to bottom.

[0024] The bottom of the cylinder is provided with a drain port, the side wall of the skirt support is provided with an inspection port, and the side wall of the cylinder is provided with two discharge ports, which are respectively located in the middle of the two reaction beds.

[0025] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0026] 1. In a coke oven gas desulfurization tower of the present invention, a gas distributor is fixedly installed at the top of the cylinder. A gas distribution chamber is located between the upper reaction bed and the top of the cylinder. The gas distributor can uniformly distribute the coke oven gas within the gas distribution chamber. The uniformly distributed coke oven gas passes through two reaction beds sequentially from top to bottom, and is desulfurized and dechlorinated under the action of a high-dechlorination agent and a zinc oxide desulfurizing agent within the reaction beds. Therefore, this design can effectively improve the desulfurization efficiency by ensuring sufficient contact between the coke oven gas and the high-dechlorination agent and the zinc oxide desulfurizing agent through the gas distributor.

[0027] 2. In the coke oven gas desulfurization tower of the present invention, the reaction bed includes a correspondingly arranged bottom support device and a top limiting device. The support grid plate in the bottom support device is supported by I-beams and supports, which can withstand a large weight, thereby allowing a large amount of chemical adsorbent to be placed in the reaction bed. This prolongs the contact time between the coke oven gas and the chemical adsorbent, completing the desulfurization operation in one desulfurization tower. Therefore, this design can prolong the contact time between the coke oven gas and the chemical adsorbent, effectively reducing the equipment volume.

[0028] 3. In the coke oven gas desulfurization tower of this invention, the coke oven gas can be preheated, thereby improving the mass transfer efficiency between the coke oven gas and the chemical adsorbent, and thus further improving the desulfurization efficiency. Therefore, this design lays an insulation layer inside the cylinder and sets an insulation ring outside the cylinder for easy installation of insulation materials to maintain the temperature of the coke oven gas. At the same time, the temperature of the chemical adsorbent is monitored by multiple thermometers. Therefore, this design can further improve the desulfurization efficiency by increasing the reaction temperature. Attached Figure Description

[0029] Figure 1 This is a schematic diagram of the structure of the present invention.

[0030] Figure 2 yes Figure 1 A schematic diagram of the bottom support device.

[0031] Figure 3 yes Figure 1 A schematic diagram of the exhaust pipe structure.

[0032] In the diagram: 1. Cylinder body; 11. Exhaust pipe; 12. Gas distribution chamber; 13. Inspection chamber; 14. Skirt support; 15. Tower top hanging column; 16. Insulation layer; 17. Insulation ring; 18. Drain outlet; 19. Inspection port; 10. Unloading port; 20. Manhole; 21. Gas distributor; 32. Reactor bed; 31. Bottom support device; 32. Top limiting device; 33. Support grid plate; 34. Bottom stainless steel wire mesh; 35. Refractory ball; 36. I-beam; 37. Support; 38. Limiting grid plate; 39. Top stainless steel wire mesh; 30. Thermometer; 4. Chemical adsorbent. Detailed Implementation

[0033] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0034] Example 1:

[0035] See Figure 1 A desulfurization tower for coke oven gas, wherein the desulfurization tank comprises: a cylinder 1, a gas distributor 2, and a reaction bed 3;

[0036] The cylinder 1 is a closed vertical cylindrical structure. A gas distributor 2 is fixedly installed at the top of the cylinder 1, and an exhaust pipe 11 is installed at the bottom of the cylinder 1. The reaction bed 3 is installed inside the cylinder 1, and a chemical adsorbent 4 is installed inside the reaction bed 3. The gas distributor 2 is used to distribute the coke oven gas evenly on the cross section of the cylinder 1. When the coke oven gas passes through the cylinder 1, it is desulfurized and dechlorinated under the action of the chemical adsorbent 4.

[0037] The cylinder 1 contains two reaction beds 3 arranged from top to bottom. The upper reaction bed 3 contains a high-efficiency dechlorination agent 4, and the lower reaction bed 3 contains a zinc oxide desulfurizing agent 4. A gas distribution chamber 12 is located between the upper reaction bed 3 and the top of the cylinder 1, and a maintenance chamber 13 is located between the two reaction beds 3. Manholes 20 are provided on the side walls of both the gas distribution chamber 12 and the maintenance chamber 13.

[0038] The maintenance chamber 13 between the two reaction beds 3 not only facilitates maintenance, but also provides space for uniform airflow distribution;

[0039] The bottom support device 31 includes a support grid plate 33, a bottom stainless steel wire mesh 34, multiple refractory balls 35, multiple I-beams 36, and multiple supports 37. The supports 37 are evenly distributed along the circumferential direction on the inner wall of the cylinder 1. The multiple I-beams 36 are fixedly mounted on the top of each support 37. The support grid plate 33 is fixedly mounted on the top of each I-beam 36. The outer edge of the support grid plate 33 contacts the inner wall of the cylinder 1. The bottom stainless steel wire mesh 34 is positioned directly above the support grid plate 33, and the outer edge of the bottom stainless steel wire mesh 34 is... The inner wall of the cylinder 1 is fixedly connected, and the bottom stainless steel wire mesh 34 and the supporting grid plate 33 are filled with multiple fire-resistant balls 35; the top limiting device 32 includes fire-resistant balls 35, a limiting grid plate 38 and a top stainless steel wire mesh 39. The outer edge of the limiting grid plate 38 is fixedly connected to the inner wall of the cylinder 1, and the top stainless steel wire mesh 39 is provided directly above the limiting grid plate 38. The outer edge of the top stainless steel wire mesh 39 is fixedly connected to the inner wall of the cylinder 1, and the top stainless steel wire mesh 39 and the limiting grid plate 38 are filled with multiple fire-resistant balls 35.

[0040] The support grid plate in the bottom support device 31 is supported by I-beams and supports, which can withstand a large weight, so that a large amount of chemical adsorbent 4 can be placed in the reaction bed 3. Since the diameter of the reaction bed 3 remains unchanged, increasing the amount of chemical adsorbent 4 is equivalent to increasing the thickness of the reaction bed 3, thereby prolonging the contact time between the coke oven gas and the chemical adsorbent 4.

[0041] The exhaust pipe 11 is arranged horizontally on the cylinder 1. The interior of the cylinder 1 is connected to the outside through the exhaust pipe 11. The air inlet of the exhaust pipe 11 is an anti-falling inclined port, and the inlet inlet of the exhaust pipe 11 has an inclination angle of 45 degrees.

[0042] The inclined design of the air inlet can prevent the chemical adsorbent 4 above from falling into the exhaust pipe 11 through the gap in the bottom support device 31, thus preventing safety hazards.

[0043] Example 2:

[0044] Example 2 is basically the same as Example 1, except that:

[0045] The reaction bed 3 includes a bottom support device 31 and a top limiting device 32, and a chemical adsorbent 4 is filled between the bottom support device 31 and the top limiting device 32. The bottom support device 31 includes two layers of bottom stainless steel wire mesh 34, and the mesh of the two layers of bottom stainless steel wire mesh 34 is staggered. The top limiting device 32 includes two layers of top stainless steel wire mesh 39, and the mesh of the two layers of top stainless steel wire mesh 39 is staggered.

[0046] Setting two layers of stainless steel wire mesh can improve the support strength, while the staggered mesh of the stainless steel wire mesh can reduce the mesh count, effectively preventing catalyst leakage and uneven airflow distribution.

[0047] Example 3:

[0048] Example 3 is basically the same as Example 2, except that:

[0049] The reaction bed 3 also includes a plurality of thermometers 30, which are evenly arranged from top to bottom between the bottom support device 31 and the top limiting device 32. The signal output end of the thermometer 30 passes through the side wall of the cylinder 1 and is fixedly connected to the cylinder 1. The contact medium end of the thermometer 30 is inserted into the chemical adsorbent 4 and is set on the central axis of the reaction bed 3.

[0050] Multiple thermometers 30 can accurately monitor the temperature of the central part of the chemical adsorbent 4, thereby monitoring the desulfurization rate and avoiding safety hazards caused by excessive temperature.

[0051] The bottom of the cylinder 1 is fixedly provided with a skirt support 14, the top of the cylinder 1 is fixedly provided with a tower top hanging column 15, the inner wall of the cylinder 1 is uniformly provided with a heat insulation layer 16, and the outer wall of the cylinder 1 is uniformly provided with multiple heat insulation rings 17 from top to bottom.

[0052] The insulation ring 17 is used to fix the insulation material and provide a stable support structure for the insulation material, ensuring that the insulation material maintains its integrity and thermal insulation performance under complex working conditions;

[0053] The bottom of the cylinder 1 is provided with a drain port 18, the side wall of the skirt support 14 is provided with an inspection port 19, and the side wall of the cylinder 1 is provided with two discharge ports 10, which are respectively located in the middle of the two reaction beds 3.

[0054] The above description is only a preferred embodiment of the present invention. The scope of protection of the present invention is not limited to the above embodiments. Any equivalent modifications or changes made by those skilled in the art based on the content disclosed in the present invention should be included within the scope of protection set forth in the claims.

Claims

1. A coke oven gas desulfurization tower, characterized in that, The desulfurization tank includes: a cylinder (1), a gas distributor (2), and a reaction bed (3); The cylinder (1) is a closed vertical cylindrical structure. A gas distributor (2) is fixedly installed at the top of the cylinder (1), and an exhaust pipe (11) is installed at the bottom of the cylinder (1). The reaction bed (3) is set inside the cylinder (1), and a chemical adsorbent (4) is set inside the reaction bed (3). The gas distributor (2) is used to distribute the coke oven gas evenly on the cross section of the cylinder (1). When the coke oven gas passes through the cylinder (1), it is desulfurized and dechlorinated under the action of the chemical adsorbent (4).

2. The coke oven gas desulfurization tower according to claim 1, characterized in that, The cylinder (1) contains two reaction beds (3) arranged from top to bottom. The chemical adsorbent (4) in the upper reaction bed (3) is a high dechlorination agent, and the chemical adsorbent (4) in the lower reaction bed (3) is a zinc oxide desulfurizing agent. The gas distribution chamber (12) is located between the upper reaction bed (3) and the top of the cylinder (1), and the maintenance chamber (13) is located between the two reaction beds (3). Manholes (20) are provided on the side walls of the gas distribution chamber (12) and the maintenance chamber (13).

3. A coke oven gas desulfurization tower according to claim 2, characterized in that, The reaction bed (3) includes a bottom support device (31) and a top limiting device (32) respectively, and a chemical adsorbent (4) is filled between the bottom support device (31) and the top limiting device (32). The bottom support device (31) includes a support grid plate (33), a bottom stainless steel wire mesh (34), multiple fire-resistant balls (35), multiple I-beams (36) and multiple supports (37). The multiple supports (37) are evenly distributed on the inner wall of the cylinder (1) along the circumferential direction. The multiple I-beams (36) are fixedly installed on the top of each support (37). The support grid plate (33) is fixedly installed on the top of each I-beam (36). The outer edge of the support grid plate (33) is in contact with the inner wall of the cylinder (1). The bottom stainless steel wire mesh (34) is provided directly above the support grid plate (33). The outer edge of the bottom stainless steel wire mesh (34) is fixedly connected to the inner wall of the cylinder (1). The bottom stainless steel wire mesh (34) and the support grid plate (33) are filled by multiple fire-resistant balls (35). The top limiting device (32) includes fire-resistant balls (35), a limiting grid plate (38), and a top stainless steel wire mesh (39). The outer edge of the limiting grid plate (38) is fixedly connected to the inner wall of the cylinder (1). A top stainless steel wire mesh (39) is provided directly above the limiting grid plate (38). The outer edge of the top stainless steel wire mesh (39) is fixedly connected to the inner wall of the cylinder (1). The top stainless steel wire mesh (39) and the limiting grid plate (38) are filled by multiple fire-resistant balls (35).

4. A coke oven gas desulfurization tower according to claim 2, characterized in that, The bottom support device (31) includes two layers of bottom stainless steel wire mesh (34), with the mesh of the two layers of bottom stainless steel wire mesh (34) arranged in an alternating manner. The top limiting device (32) includes two layers of top stainless steel wire mesh (39), with the mesh of the two layers of top stainless steel wire mesh (39) arranged in an alternating manner.

5. A coke oven gas desulfurization tower according to claim 3 or 4, characterized in that: The reaction bed (3) also includes multiple thermometers (30), which are evenly arranged from top to bottom between the bottom support device (31) and the top limiting device (32). The signal output end of the thermometer (30) passes through the side wall of the cylinder (1) and is fixedly connected to the cylinder (1). The contact medium end of the thermometer (30) is inserted into the chemical adsorbent (4) and then placed on the central axis of the reaction bed (3).

6. A coke oven gas desulfurization tower according to claim 1, characterized in that, The exhaust pipe (11) is arranged horizontally on the cylinder (1). The interior of the cylinder (1) is connected to the outside through the exhaust pipe (11). The air inlet of the exhaust pipe (11) is an anti-dropping oblique opening. The inlet angle of the exhaust pipe (11) is 45 degrees.

7. A coke oven gas desulfurization tower according to claim 1, characterized in that, The bottom of the cylinder (1) is fixedly provided with a skirt support (14), the top of the cylinder (1) is fixedly provided with a tower top hanging column (15), the inner wall of the cylinder (1) is uniformly provided with a heat insulation layer (16), and the outer wall of the cylinder (1) is uniformly provided with multiple heat insulation rings (17) from top to bottom.

8. A coke oven gas desulfurization tower according to claim 7, characterized in that, The bottom of the cylinder (1) is provided with a drain port (18), the side wall of the skirt support (14) is provided with an inspection port (19), and the side wall of the cylinder (1) is provided with two discharge ports (10), which are respectively located in the middle of the two reaction beds (3).

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