Chemical coke oven gas debenzolization device

Abstract

The utility model relates to a chemical coke oven gas debenzolization device which comprises an adsorption tower, the bottom surface of the adsorption tower is connected with a third communication pipeline, the end part of the third communication pipeline is connected with a coke oven gas inlet pipeline, the surface of the adsorption tower is fixedly connected with a second communication pipeline, and the second communication pipeline is connected with a second discharge pipeline. And a third program-controlled pump is fixedly mounted on the second communicating pipeline. An aluminum oxide ceramic ball layer, a first steel wire mesh layer, a mesoporous silica gel layer, a second steel wire mesh layer and a fine-pore silica gel layer are sequentially arranged in the adsorption tower from bottom to top. The end of the third communication pipeline is connected with a fourth communication pipeline, the fourth communication pipeline is connected with a fan, and one side of the fan is connected with a fuel gas system. The second communication pipeline is connected with a first communication pipeline, the first communication pipeline is connected with a first discharge pipeline, and a fourth program-controlled pump and a fifth program-controlled pump are mounted on the first communication pipeline. The waste gas recycling device has the beneficial effects of more reasonable structural design, novel conception, convenience in operation, energy conservation, environment friendliness, reliability in use and capability of recycling waste gas.

Description

Technical Field

[0001] The utility model relates to the technical field of debenzenization of coke oven gas, in particular to a debenzenization device for coke oven gas used in chemical industry. Background Art

[0002] The debenzenization technology of coke oven gas has always been a key factor restricting the use of coke oven gas to produce hydrogen. In particular, the content of benzene impurities in coke oven gas is relatively high. How to effectively remove benzene has become a bottleneck in the process technology of hydrogen production from coke oven gas. The benzene impurities in coke oven gas will not only cause blockage in the bed of the hydrogenation reactor, the bed of the desulfurization tower and the furnace tube of the converter, but also cause the process to be unable to operate stably for a long time. In addition, the cost of replacing catalysts and desulfurizers is relatively high, which brings an economic burden to enterprises. Therefore, it is particularly important to solve the problem of debenzenization of coke oven gas.

[0003] At present, the more commonly used technologies for debenzening coke oven gas include steam heating, tubular furnace heating and negative pressure debenzening. However, these technologies have some obvious disadvantages and cannot perfectly solve the problem of debenzening coke oven gas. For example, the steam heating method consumes a lot of energy, while the tubular furnace heating method has high requirements for equipment. In addition, although the negative pressure debenzening method can effectively remove benzene impurities, it is complicated to operate and has high costs.

[0004] Therefore, in order to break through the bottleneck of coke oven gas debenzenization technology and continuously explore new solutions, possible directions include developing new adsorbents to more efficiently remove benzene impurities; optimizing the existing debenzenization process to improve its stability and efficiency; exploring cross-applications with other fields, such as chemical engineering or environmental engineering, to seek better solutions.

[0005] In summary, coke oven gas debenzenization technology is an important factor restricting the use of coke oven gas to produce hydrogen. Although there are several commonly used debenzenization technologies, their shortcomings limit their effectiveness in practical applications. Therefore, researchers need to continue to work hard to find more effective and environmentally friendly solutions to promote the development of coke oven gas hydrogen production process. Utility Model Content

[0006] The utility model aims to provide a chemical coke oven gas debenzening device which has a more reasonable structural design, novel concept, convenient operation, energy saving and environmental protection, reliable use, and can realize waste gas recovery and utilization.

[0007] The utility model discloses a debenzenization device for chemical coke oven gas, comprising an adsorption tower, a third connecting pipe is fixedly connected to the bottom surface of the adsorption tower, an end of the third connecting pipe is connected to the coke oven gas inlet pipe, a second connecting pipe is fixedly connected to the surface of the adsorption tower, the second connecting pipe is connected to the second discharge pipe, and a third program-controlled pump is fixedly installed on the second connecting pipe.

[0008] The adsorption tower is provided with an alumina ceramic ball layer, a first steel wire mesh layer, a medium-pore silica gel layer, a second steel wire mesh layer and a fine-pore silica gel layer in sequence from bottom to top.

[0009] The coke oven gas inlet pipe and the third connecting pipe are provided to sequentially introduce the coke oven gas. The coke oven gas enters the adsorption tower and is adsorbed sequentially through the alumina ceramic ball layer, the first steel mesh layer, the medium-porous silica gel layer, the second steel mesh layer, and the fine-porous silica gel layer. The alumina ceramic ball layer is provided to support the adsorbent and also has the functions of absorbing water and distributing the airflow uniformly. The first steel mesh layer is provided to isolate the alumina ceramic ball layer from the medium-porous silica gel layer, and the second steel mesh layer is provided to isolate the medium-porous silica gel layer and the fine-porous silica gel layer. The medium-porous silica gel layer and the fine-porous silica gel layer are provided to remove benzene from the coke oven gas and purify the coke oven gas. After the adsorption is completed, the adsorption tower immediately enters the desorption step to prepare for the next adsorption process, that is, the coke oven gas after adsorption passes through the second connecting pipe and the second discharge pipe and enters the decarbonization process, which can be used as a purging gas source. The third programmable pump provided can control the amount and time of gas passing through.

[0010] The end of the third connecting pipe is connected to a fourth connecting pipe, the fourth connecting pipe is connected to a fan, and one side of the fan is connected to a fuel gas system.

[0011] The third connecting pipe and the fourth connecting pipe are set to discharge the remaining coke oven gas in the adsorption tower, which enters the fan to be pressurized, and then enters the fuel gas system after the pressurization operation, so as to realize the recycling of waste gas and save energy and protect the environment; the purge gas enters the adsorption tower from the decarbonization process through the second discharge pipe and the second connecting pipe, and purges the benzene adsorbed on the medium-pore silica gel layer and the fine-pore silica gel layer, and is brought into the fuel gas system for combustion by the remaining coke oven gas.

[0012] The second communicating pipe is connected to the first communicating pipe, the first communicating pipe is connected to the first discharge pipe, and the fourth program-controlled pump and the fifth program-controlled pump are fixedly installed on the first communicating pipe.

[0013] The second connecting pipe, the first connecting pipe and the first discharge pipe are set up. The coke oven gas adsorbed by the adsorption tower can enter the desulfurization process through the above pipes. Finally, the gas enters the adsorption tower in the next process through the first discharge pipe and the first connecting pipe to prepare for the adsorption work.

[0014] The beneficial effects of the utility model are:

[0015] 1) The coke oven gas inlet pipe and the third connecting pipe are provided to sequentially introduce the coke oven gas. The coke oven gas enters the adsorption tower and is adsorbed by the alumina ceramic ball layer, the first steel mesh layer, the mesoporous silica gel layer, the second steel mesh layer, and the fine-porous silica gel layer in sequence. The alumina ceramic ball layer is provided to support the adsorbent and also has the functions of absorbing water and distributing the airflow uniformly. The first steel mesh layer is provided to isolate the alumina ceramic ball layer from the mesoporous silica gel layer, and the second steel mesh layer is provided to isolate the mesoporous silica gel layer and the fine-porous silica gel layer. The mesoporous silica gel layer and the fine-porous silica gel layer are provided to remove benzene from the coke oven gas and purify the coke oven gas. The adsorption structure used above can be recycled and reused, which is energy-saving and environmentally friendly and safer and more reliable to use. At the same time, it can also greatly reduce the energy consumption in the production process. After the adsorption is completed, the adsorption tower immediately enters the desorption step to prepare for the next adsorption process, that is, the coke oven gas after adsorption passes through the second connecting pipe and the second discharge pipe and enters the decarbonization process, which can be used as a purging gas source. The third programmable pump provided can control the amount and time of the gas passing through.

[0016] 2) The third connecting pipe and the fourth connecting pipe are set to discharge the remaining coke oven gas in the adsorption tower and enter the fan to achieve pressurization. After the pressurization operation, it enters the fuel gas system, which can realize the recycling of waste gas and save energy and protect the environment. The purge gas enters the adsorption tower from the decarbonization process through the second discharge pipe and the second connecting pipe, and purges the benzene adsorbed on the medium-pore silica gel layer and the fine-pore silica gel layer, and is brought into the fuel gas system by the remaining coke oven gas for combustion, avoiding the need to recover the impurity benzene, realizing the continuous debenzenization of coke oven gas, solving the problem of the bed layer of the hydrogenation reactor, the bed layer of the desulfurization tower, and the furnace tube of the converter being blocked by the impurity benzene, and realizing the long-term stable production of the device.

[0017] 3) The second connecting pipe, the first connecting pipe and the first discharge pipe are set up. The coke oven gas adsorbed by the adsorption tower can enter the desulfurization process through the above pipes, and finally the gas enters the adsorption tower in the next process through the first discharge pipe and the first connecting pipe to prepare for the adsorption work.

[0018] 4) The device has a reasonable structural design, convenient operation and novel concept. It has been put into production and use with good results and is worthy of large-scale promotion and application. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a structural schematic diagram of the utility model.

[0020] In the figure: coke oven gas inlet pipeline 1, adsorption tower 2, alumina ceramic ball layer 3, first steel mesh layer 4, medium-pore silica gel layer 5, second steel mesh layer 6, fine-pore silica gel layer 7, first program-controlled valve 8, second program-controlled valve 9, third program-controlled valve 10, fourth program-controlled valve 11, fifth program-controlled valve 12, first discharge pipeline 13, second discharge pipeline 14, fan 15, fuel gas system 16, first connecting pipeline 17, second connecting pipeline 18, third connecting pipeline 19, fourth connecting pipeline 20. DETAILED DESCRIPTION

[0021] Example 1.

[0022] The following will be combined with the attached Figure 1 The utility model is further described.

[0023] The utility model comprises a coke oven gas inlet pipeline 1, an adsorption tower 2, an alumina ceramic ball layer 3, a first steel mesh layer 4, a medium-pore silica gel layer 5, a second steel mesh layer 6, a fine-pore silica gel layer 7, a first program-controlled valve 8, a second program-controlled valve 9, a third program-controlled valve 10, a fourth program-controlled valve 11, a fifth program-controlled valve 12, a first discharge pipeline 13, a second discharge pipeline 14, a fan 15, a fuel gas system 16, a first connecting pipeline 17, a second connecting pipeline 18, a third connecting pipeline 19, and a fourth connecting pipeline 20. The specific structure comprises an adsorption tower 2, a third connecting pipeline 19 is fixedly connected to the bottom surface of the adsorption tower 2, an end of the third connecting pipeline 19 is connected to the coke oven gas inlet pipeline 1, a second connecting pipeline 18 is fixedly connected to the surface of the adsorption tower 2, the second connecting pipeline 18 is connected to the second discharge pipeline 14, and a third program-controlled pump 10 is fixedly installed on the second connecting pipeline 18.

[0024] The adsorption tower 2 is provided with an alumina ceramic ball layer 3, a first steel wire mesh layer 4, a medium-pore silica gel layer 5, a second steel wire mesh layer 6, and a fine-pore silica gel layer 7 in order from bottom to top.

[0025] The end of the third connecting pipe 19 is connected to the fourth connecting pipe 20, the fourth connecting pipe 20 is connected to the fan 15, and one side of the fan 15 is connected to the fuel gas system.

[0026] The diameter of the alumina ceramic ball layer 3 is 50 mm, and the alumina ceramic ball layer 3 is filled with alumina ceramic ball adsorbent solidified into a spherical shape; the aperture of the first steel mesh layer 4 and the second steel mesh layer 6 is 20 mesh; the fine-porous silica gel layer 7 is filled with silica gel particles with a particle size of 2.5 nm; and the mesoporous silica gel layer 5 is filled with silica gel particles with a particle size of 4.5-7.0 nm.

[0027] The blower 15 is a Roots blower, model TGS-350A; the models of the first program-controlled valve 8, the second program-controlled valve 9, the third program-controlled valve 10, the fourth program-controlled valve 11, and the fifth program-controlled valve 12 are: CXJ641F.

[0028] The coke oven gas has a pressure of 0.43 MPa, a temperature of 40° C., and a benzene content of about 2000 mg / Nm3. After the desulfurization process, the benzene content of the debenzenized purified gas is less than 10 mg / Nm3.

[0029] Usage: The coke oven gas enters the adsorption tower 2 through the coke oven gas inlet pipe 1 and the third connecting pipe 19, and is adsorbed by the alumina ceramic ball layer 3, the first steel mesh layer 4, the mesoporous silica gel layer 5, the second steel mesh layer 6, and the fine-porous silica gel layer 7 in sequence. The mesoporous silica gel layer 5 and the fine-porous silica gel layer 7 are used to remove benzene from the coke oven gas. After the adsorption is completed, the adsorption tower 2 immediately enters the desorption step to prepare for the next adsorption process, that is, the coke oven gas after adsorption passes through the second connecting pipe 18 and the second discharge pipe 14 and enters the decarbonization process, which can be used as a purging gas source. The third programmable pump 10 is provided to control the amount and time of gas passing through; the third connecting pipe 19 and the fourth connecting pipe 20 are provided to discharge the remaining coke oven gas in the adsorption tower 2, and enter the fan 15 to achieve pressurization, and then enter the fuel gas system after the pressurization operation, so as to realize the recycling of waste gas and save energy and protect the environment; the purge gas enters the adsorption tower 2 from the decarbonization process through the second discharge pipe 14 and the second connecting pipe 18, and purges the benzene adsorbed on the mesoporous silica gel layer 5 and the fine-porous silica gel layer 7, and is brought into the fuel gas system by the remaining coke oven gas for combustion.

[0030] Example 2.

[0031] The utility model comprises a coke oven gas inlet pipeline 1, an adsorption tower 2, an alumina ceramic ball layer 3, a first steel mesh layer 4, a medium-pore silica gel layer 5, a second steel mesh layer 6, a fine-pore silica gel layer 7, a first program-controlled valve 8, a second program-controlled valve 9, a third program-controlled valve 10, a fourth program-controlled valve 11, a fifth program-controlled valve 12, a first discharge pipeline 13, a second discharge pipeline 14, a fan 15, a fuel gas system 16, a first connecting pipeline 17, a second connecting pipeline 18, a third connecting pipeline 19, and a fourth connecting pipeline 20. The specific structure comprises an adsorption tower 2, a third connecting pipeline 19 is fixedly connected to the bottom surface of the adsorption tower 2, an end of the third connecting pipeline 19 is connected to the coke oven gas inlet pipeline 1, a second connecting pipeline 18 is fixedly connected to the surface of the adsorption tower 2, the second connecting pipeline 18 is connected to the second discharge pipeline 14, and a third program-controlled pump 10 is fixedly installed on the second connecting pipeline 18.

[0032] The adsorption tower 2 is provided with an alumina ceramic ball layer 3, a first steel wire mesh layer 4, a medium-pore silica gel layer 5, a second steel wire mesh layer 6, and a fine-pore silica gel layer 7 in order from bottom to top.

[0033] The end of the third connecting pipe 19 is connected to the fourth connecting pipe 20, the fourth connecting pipe 20 is connected to the fan 15, and one side of the fan 15 is connected to the fuel gas system.

[0034] The second communicating pipe 18 is connected to the first communicating pipe 17 , the first communicating pipe 17 is connected to the first discharge pipe 13 , and the fourth program-controlled pump 11 and the fifth program-controlled pump 12 are fixedly installed on the first communicating pipe 17 .

[0035] The diameter of the alumina ceramic ball layer 3 is 50 mm, and the alumina ceramic ball layer 3 is filled with alumina ceramic ball adsorbent solidified into a spherical shape; the aperture of the first steel mesh layer 4 and the second steel mesh layer 6 is 20 mesh; the fine-porous silica gel layer 7 is filled with silica gel particles with a particle size of 2.5 nm; and the mesoporous silica gel layer 5 is filled with silica gel particles with a particle size of 4.5-7.0 nm.

[0036] The blower 15 is a Roots blower, model TGS-350A; the models of the first program-controlled valve 8, the second program-controlled valve 9, the third program-controlled valve 10, the fourth program-controlled valve 11, and the fifth program-controlled valve 12 are: CXJ641F.

[0037] The coke oven gas has a pressure of 0.43 MPa, a temperature of 40° C., and a benzene content of about 2000 mg / Nm3. After the desulfurization process, the benzene content of the debenzenized purified gas is less than 10 mg / Nm3.

[0038] Method of use: The coke oven gas enters the adsorption tower 2 through the coke oven gas inlet pipe 1 and the third connecting pipe 19, and is adsorbed by the alumina ceramic ball layer 3, the first steel mesh layer 4, the medium-porous silica gel layer 5, the second steel mesh layer 6, and the fine-porous silica gel layer 7 in sequence. The medium-porous silica gel layer 5 and the fine-porous silica gel layer 7 are used to remove benzene from the coke oven gas. After the adsorption is completed, the adsorption tower 2 immediately enters the desorption step to prepare for the next adsorption process, that is, the coke oven gas after adsorption passes through the second connecting pipe 18 and the second discharge pipe 14 and enters the decarbonization process, which can be used as a purge gas source. The third programmable pump 10 can control the amount and time of the gas passing through; the third connecting pipe 19 and the fourth connecting pipe 20 are set. , the remaining coke oven gas in the adsorption tower 2 can be discharged and enter the fan 15 to be pressurized, and then enter the fuel gas system after the pressurization operation, so as to realize the recycling of waste gas and save energy and protect the environment; the purge gas enters the adsorption tower 2 from the decarbonization process through the second discharge pipe 14 and the second connecting pipe 18, and purges the benzene adsorbed on the medium-pore silica gel 5 and the fine-pore silica gel 7, and is brought into the fuel gas system by the remaining coke oven gas for combustion; the coke oven gas adsorbed by the adsorption tower 2 can enter the desulfurization process through the second connecting pipe 18, the first connecting pipe 17 and the first discharge pipe 13, and finally the gas enters the adsorption tower in the next process through the first discharge pipe 13 and the first connecting pipe 17 to prepare for the adsorption work.

Claims

1. A chemical coke oven gas debenzenization device, characterized in that: The adsorption tower (2) comprises a third connecting pipe (19) fixedly connected to the bottom surface of the adsorption tower (2), the end of the third connecting pipe (19) being connected to a coke oven gas inlet pipe (1), a second connecting pipe (18) fixedly connected to the surface of the adsorption tower (2), the second connecting pipe (18) being connected to a second discharge pipe (14), and a third programmable pump (10) fixedly mounted on the second connecting pipe (18).

2. A chemical coke oven gas debenzening device as claimed in claim 1, characterized in that: The adsorption tower (2) is provided with an alumina ceramic ball layer (3), a first steel wire mesh layer (4), a medium-pore silica gel layer (5), a second steel wire mesh layer (6), and a fine-pore silica gel layer (7) in order from bottom to top.

3. A chemical coke oven gas debenzening device as claimed in claim 2, characterized in that: The end of the third connecting pipe (19) is connected to a fourth connecting pipe (20), the fourth connecting pipe (20) is connected to the fan (15), and one side of the fan (15) is connected to the fuel gas system.

4. A chemical coke oven gas debenzening device as claimed in claim 3, characterized in that: The second communicating pipe (18) is connected to the first communicating pipe (17), the first communicating pipe (17) is connected to the first discharge pipe (13), and the first communicating pipe (17) is fixedly mounted with a fourth programmable pump (11) and a fifth programmable pump (12).

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