An improved coke oven gas hydrogen extraction TSA treatment device and process

Abstract

The invention discloses an improved coke oven gas hydrogen stripping TSA treatment device and process, which comprises a separator, a pretreatment adsorption tower A, a pretreatment adsorption tower D, a regeneration gas steam heater, a pressure-equalizing tower regeneration gas shortcut valve, a heating regeneration gas valve, a cold blowing regeneration gas valve, a tower A coke oven gas inlet valve, a tower A coke oven gas outlet valve, a tower A pressure-equalizing valve, a tower A regeneration gas inlet valve, a tower A regeneration gas outlet valve, a tower A decompression gas recovery program-controlled valve, a tower B coke oven gas inlet valve, a tower B coke oven gas outlet valve, a tower B pressure-equalizing valve, a tower B regeneration gas inlet valve, a tower B regeneration gas outlet valve and a tower B decompression gas recovery program-controlled valve; the coke oven gas utilizes the decompression gas recovery program-controlled valve to recycle the coke oven gas discharged in the decompression process of the pretreatment adsorption tower that needs to be regenerated after completing the pressure-equalizing and decompression process, and at the same time, the analytical gas components are stabilized to the maximum extent, which is convenient for the working condition adjustment of the user unit, and provides a new research direction for the optimization and improvement of the coke oven gas hydrogen stripping TSA treatment process.

Description

Technical Field

[0001] The invention belongs to the technical field of deep purification of coke oven gas, and in particular relates to an improved coke oven gas hydrogen extraction TSA treatment device and process. Background Art

[0002] In the prior art, the conventional TSA process for hydrogen extraction from coke oven gas requires the regeneration of a pretreatment adsorption tower. After the pressure equalization and pressure reduction process is completed, the remaining coke oven gas in the pretreatment adsorption tower is discharged into the analytical gas network through a pressure reduction process and used as fuel gas. This results in a waste of coke oven gas resources. The higher the pretreatment pressure is, the greater the waste will be. In addition, since the composition of this part of the gas is quite different from that of the analytical gas, the operating conditions of the analytical gas-using unit will be temporarily unstable. Summary of the invention

[0003] The purpose of the present invention is to solve the above-mentioned technical problems existing in the prior art and to provide an improved coke oven gas hydrogen extraction TSA treatment device and process to overcome the shortcomings of the prior art.

[0004] In order to achieve the above-mentioned purpose, the present invention provides an improved coke oven gas hydrogen extraction TSA processing device on the one hand, which includes a separator, a pretreatment adsorption tower A, a pretreatment adsorption tower B, a pretreatment adsorption tower C, a pretreatment adsorption tower D, a regeneration gas steam heater, a pressure equalizing tower regeneration gas shortcut valve, a heating regeneration gas valve, a cold blowing regeneration gas valve, a tower A coke oven gas inlet valve, a tower A coke oven gas outlet valve, a tower A pressure equalizing valve, a tower A regeneration gas inlet valve, a tower A regeneration gas outlet valve, a tower A decompression gas recovery program-controlled valve, a tower B coke oven gas inlet valve, a tower B coke oven gas outlet valve, a tower B pressure equalizing valve, a tower B regeneration gas inlet valve, a tower B regeneration gas outlet valve and a tower B decompression gas recovery program-controlled valve;

[0005] The pretreatment adsorption tower A, the pretreatment adsorption tower B, the pretreatment adsorption tower C and the pretreatment adsorption tower D are connected in parallel, three of which are operated normally and one is regenerated; impurities such as tar, sulfur and naphthalene in the coke oven gas are removed;

[0006] The separator is connected to the pretreatment adsorption tower A through the coke oven gas inlet valve of the tower A to filter the oil, water and some impurities in the coke oven gas;

[0007] The separator is connected to the pretreatment adsorption tower B through the coke oven gas inlet valve of the tower B to filter the oil, water and some impurities in the coke oven gas;

[0008] The pretreatment adsorption tower A2 is connected to the coke oven gas outlet valve 11 of the tower A, and sends the pretreated qualified coke oven gas to the low pressure machine;

[0009] The pretreatment adsorption tower B is connected to the coke oven gas outlet valve of the tower B to send the pretreated qualified coke oven gas to the low pressure machine;

[0010] The pressure-equalizing tower regeneration gas shortcut valve discharges the hydrogen extraction and analysis gas directly to the analysis gas pipeline network, which is convenient for the pressure-equalizing tower of the pretreatment adsorption tower A and the pretreatment adsorption tower B;

[0011] The pretreatment adsorption tower A and the pretreatment adsorption tower B are connected through the tower A pressure equalizing valve and the tower B pressure equalizing valve; the coke oven gas in the pretreatment adsorption tower A that is saturated with adsorption is pressure-equalized to the pretreatment adsorption tower B that has been regenerated;

[0012] The pretreatment adsorption tower A is connected to the depressurized gas recovery program-controlled valve of the tower A, and the coke oven gas discharged from the depressurized pretreatment adsorption tower A is recovered to the coke oven gas pipeline network;

[0013] The heating regeneration gas valve is connected to the regeneration gas steam heater to heat the hydrogen extraction and decomposition gas to 140° C. with steam;

[0014] The regeneration gas steam heater is connected to the pretreatment adsorption tower A through the regeneration gas inlet valve of the tower A, and the heated regeneration gas is sent to the pretreatment adsorption tower A for high-temperature desorption of impurities;

[0015] The pretreatment adsorption tower A is connected to the regeneration gas outlet valve of the tower A, and the regeneration gas after high-temperature desorption of impurities is discharged to the analytical gas pipeline network;

[0016] The cold-blowing regeneration gas valve 9 is connected to the pretreatment adsorption tower A2 through the tower A regeneration gas inlet valve 13, and the hydrogen extraction and decomposition gas is sent to the pretreatment adsorption tower A2 for cooling the adsorbent bed;

[0017] The pretreatment adsorption tower A2 is connected to the regeneration gas outlet valve 14 of the tower A, and the regeneration gas after the cold blowing adsorbent bed is discharged to the analytical gas pipeline network;

[0018] The pretreatment adsorption tower B is connected to the coke oven gas outlet valve of the tower B, and the qualified coke oven gas after pretreatment is sent into the pretreatment adsorption tower B in reverse, and the pretreatment adsorption tower B is finally pressurized and incorporated into the system.

[0019] Another aspect of the present invention provides an improved coke oven gas hydrogen stripping TSA treatment process, comprising the following steps:

[0020] a. The coke oven gas from the gas holder section of the coking unit is pressurized by a screw compressor and enters the temperature swing adsorption (TSA) section;

[0021] b. Coke oven gas first enters the separator to separate the water and oil droplets entrained therein, and then enters from the bottom of the pretreatment adsorption tower;

[0022] c. There are 4 pretreatment adsorption towers in series, 3 of which (the specific number depends on the amount of coke oven gas to be treated) are in the desulfurization and denaphthalene state, and 1 is in the regeneration state. When the regeneration is completed, it will be switched to one of the remaining 3 for pressure equalization according to the program setting sequence. Each pretreatment adsorption tower is equipped with 4 layers of adsorbent, which adsorb tar, water, sulfur, naphthalene and other impurities from bottom to top;

[0023] d. When the pretreatment adsorption tower A is saturated with adsorption, it switches to the regeneration process with the pretreatment adsorption tower B after pressure equalization;

[0024] e. Regeneration pressure equalization and pressure reduction process: close the cold blowing regeneration gas valve and the regeneration gas steam heater, heat the regeneration gas inlet valve, open the pressure equalization tower regeneration gas shortcut valve, close the tower A coke oven gas inlet valve and tower B coke oven gas inlet valve, tower A coke oven gas outlet valve and tower B coke oven gas outlet valve, tower A regeneration gas inlet valve and tower B regeneration gas inlet valve, tower A regeneration gas outlet valve and tower B regeneration gas outlet valve on the pretreatment adsorption tower A and pretreatment adsorption tower B respectively, open the tower A equalizing valve and tower B equalizing valve on the pretreatment adsorption tower A and pretreatment adsorption tower B respectively, and close the tower A decompression gas recovery program-controlled valve and tower B decompression gas recovery program-controlled valve at the same time; the pretreatment adsorption tower A that needs to be regenerated will reverse the process of the coke oven gas with a higher pressure (P: 0.2MPa) in the tower along the tower A equalizing valve pipeline to the pretreatment adsorption tower B3 with a lower pressure that has been completed and needs to be put into use, so that the pressure of the pretreatment adsorption tower A and the pretreatment adsorption tower B is equalized at about 0.1MPa;

[0025] f. Regeneration depressurization process: close the equalizing valve of tower A that needs to be regenerated, and open the depressurized gas recovery program-controlled valve of tower A at the same time; the pretreatment adsorption tower A that needs to be regenerated is depressurized at the coke oven gas inlet in the opposite direction of the adsorption direction, that is, in the reverse direction, and the gas (P: 0.1MPa) is discharged to the coke oven gas pipe network in front of the screw compressor through the depressurized gas recovery program-controlled valve of tower A;

[0026] g. Regeneration heating desorption impurity process: close the pressure-equalizing tower regeneration gas shortcut valve and the cold-blowing regeneration gas valve, open the heating regeneration gas valve and the tower A regeneration gas inlet valve of the pretreatment adsorption tower A that needs to be regenerated; use the desorption gas (P: 0.03MPa T: 30°C) produced as a by-product of the pressure swing adsorption hydrogen extraction section, after being heated to about 140°C by the regeneration gas steam heater 6, to purge the adsorption layer against the adsorption direction through the tower A regeneration gas inlet valve, so that naphthalene, tar, sulfur and other aromatic compounds can be completely desorbed under heating, and the regenerated desorption gas (P: 0.03MPa) is discharged to the analytical gas network through the tower A regeneration gas outlet valve;

[0027] h. Regeneration reverse cold blowing adsorbent bed process: turn off the regeneration gas steam heater and the heating regeneration gas valve, and open the cold blowing regeneration gas valve at the same time; after the heating desorption is completed, stop heating the regeneration gas, and continue to use normal temperature regeneration gas (P: 0.03MPaT: 30℃) through the tower A regeneration gas inlet valve to purge the adsorption bed in the opposite direction of the inlet direction to cool it to the adsorption temperature; the desorbed gas (P: 0.03MPa) after cold blowing is discharged to the analytical gas network through the tower A regeneration gas outlet valve;

[0028] i. Regeneration completion tower equalization and pressure-raising process: close the cold-blowing regeneration gas valve, the regeneration gas steam heater and the heating regeneration gas valve, open the equalization tower regeneration gas shortcut valve, and respectively close the tower A coke oven gas inlet valve and tower B coke oven gas inlet valve, tower A coke oven gas outlet valve and tower B coke oven gas outlet valve, tower A regeneration gas inlet valve and tower B regeneration gas inlet valve, tower A regeneration gas outlet valve and tower B regeneration gas outlet valve on the pretreatment adsorption tower A and pretreatment adsorption tower B, open the tower A equalization valve and tower B equalization valve on the pretreatment adsorption tower A and pretreatment adsorption tower B, and close the tower A decompression gas recovery program-controlled valve and tower B decompression gas recovery program-controlled valve at the same time; use the coke oven gas with a higher pressure (P: 0.2MPa) from the pretreatment adsorption tower to be regenerated through the tower A equalization valve and tower B equalization valve, and reverse the process to increase the pressure of the pretreatment adsorption tower B with qualified cooling adsorbent, so that the pressure of the pretreatment adsorption tower A and the pretreatment adsorption tower B is equalized at about 0.1MPa;

[0029] j. The process of final pressurization and integration into the system after the regeneration tower is completed: close the tower B equalizing valve, tower B regeneration gas inlet valve, tower B regeneration gas outlet valve, tower B depressurization gas recovery program-controlled valve and tower B coke oven gas inlet valve of the pretreatment adsorption tower B, and open the tower B coke oven gas outlet valve at the same time, and use the qualified coke oven gas after pretreatment to pass through the tower B coke oven gas outlet valve, and pressurize the pretreatment adsorption tower B after equalization and pressure boosting to the adsorption pressure (P: 0.2MPa) in the reverse direction of the process. At this point, the pretreatment adsorption tower B can open the tower B coke oven gas inlet valve and be integrated into the system for a new round of adsorption.

[0030] Furthermore, the step e and the step i are performed simultaneously, and the step j is performed while the step f, the step g and the step h are performed.

[0031] The present invention utilizes a depressurized gas recovery programmable valve to recycle the coke oven gas discharged during the depressurization process after the pretreatment adsorption tower that needs to be regenerated completes the equalization and depressurization process. At the same time, the gas composition is stabilized to the maximum extent, which is convenient for the user to adjust the working conditions, and provides a new research direction for the optimization and improvement of the TSA treatment process for hydrogen extraction from coke oven gas. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 It is a structural schematic diagram of the present invention.

[0033] In the figure, 1. separator 2. pretreatment adsorption tower A (saturated adsorption) 3. pretreatment adsorption tower B (regeneration completed) 4. pretreatment adsorption tower C (normal adsorption) 5. pretreatment adsorption tower D (normal adsorption) 6. regeneration gas steam heater 7. equalizing tower regeneration gas shortcut valve 8. heating regeneration gas valve 9. cold blowing regeneration gas valve 10. tower A coke oven gas inlet valve 11. tower A coke oven gas outlet valve 12. tower A equalizing valve 13. tower A regeneration gas inlet valve 14. tower A regeneration gas outlet valve 15. tower A depressurization gas recovery program-controlled valve 16. tower B coke oven gas inlet valve 17. tower B coke oven gas outlet valve 18. tower B equalizing valve 19. tower B regeneration gas inlet valve 20. tower B regeneration gas outlet valve 21. tower B depressurization gas recovery program-controlled valve. DETAILED DESCRIPTION

[0034] Reference Figure 1 In one aspect, the present invention provides an improved coke oven gas hydrogen extraction TSA treatment device, which includes a separator, a pretreatment adsorption tower A, a pretreatment adsorption tower B, a pretreatment adsorption tower C, a pretreatment adsorption tower D, a regeneration gas steam heater, a pressure equalizing tower regeneration gas shortcut valve, a heating regeneration gas valve, a cold blowing regeneration gas valve, a tower A coke oven gas inlet valve, a tower A coke oven gas outlet valve, a tower A pressure equalizing valve, a tower A regeneration gas inlet valve, a tower A regeneration gas outlet valve, a tower A depressurized gas recovery program-controlled valve, a tower B coke oven gas inlet valve, a tower B coke oven gas outlet valve, a tower B pressure equalizing valve, a tower B regeneration gas inlet valve, a tower B regeneration gas outlet valve and a tower B depressurized gas recovery program-controlled valve;

[0035] The pretreatment adsorption tower A2, the pretreatment adsorption tower B3, the pretreatment adsorption tower C4 and the pretreatment adsorption tower D5 are connected in parallel, three of which are operated normally and one is regenerated; impurities such as tar, sulfur and naphthalene in the coke oven gas are removed;

[0036] The separator 1 is connected to the pretreatment adsorption tower A2 through the tower A coke oven gas inlet valve 10 to filter oil, water and some impurities in the coke oven gas;

[0037] The separator 1 is connected to the pretreatment adsorption tower B3 through the tower B coke oven gas inlet valve 16 to filter oil, water and some impurities in the coke oven gas;

[0038] The pretreatment adsorption tower A2 is connected to the coke oven gas outlet valve 11 of the tower A, and sends the pretreated qualified coke oven gas to the low pressure machine;

[0039] The pretreatment adsorption tower B3 is connected to the coke oven gas outlet valve 17 of the tower B, and sends the pretreated qualified coke oven gas to the low pressure machine;

[0040] The pressure-equalizing tower regeneration gas shortcut valve 7 discharges the hydrogen extraction and analysis gas directly to the analysis gas pipeline network, which is convenient for the pressure-equalizing tower of the pretreatment adsorption tower A2 and the pretreatment adsorption tower B3;

[0041] The pretreatment adsorption tower A2 and the pretreatment adsorption tower B3 are connected through the tower A equalizing valve 12 and the tower B equalizing valve 18; the coke oven gas in the pretreatment adsorption tower A2 that is saturated with adsorption is equalized to the regenerated pretreatment adsorption tower B3;

[0042] The pretreatment adsorption tower A2 is connected to the decompression gas recovery program-controlled valve 15 of the tower A, and the decompression discharged coke oven gas in the pretreatment adsorption tower A2 is recovered to the coke oven gas pipeline network;

[0043] The heating regeneration gas valve 8 is connected to the regeneration gas steam heater 6 to heat the hydrogen extraction and decomposition gas to 140°C with steam;

[0044] The regeneration gas steam heater 6 is connected to the pretreatment adsorption tower A2 through the tower A regeneration gas inlet valve 13, and sends the heated regeneration gas to the pretreatment adsorption tower A2 for high-temperature desorption of impurities;

[0045] The pretreatment adsorption tower A2 is connected to the regeneration gas outlet valve 14 of the tower A, and the regeneration gas after high-temperature desorption of impurities is discharged to the analytical gas pipeline network;

[0046] The cold-blowing regeneration gas valve 9 is connected to the pretreatment adsorption tower A2 through the tower A regeneration gas inlet valve 13, and the hydrogen extraction and decomposition gas is sent to the pretreatment adsorption tower A2 for cooling the adsorbent bed;

[0047] The pretreatment adsorption tower A2 is connected to the regeneration gas outlet valve 14 of the tower A, and the regeneration gas after the cold blowing adsorbent bed is discharged to the analytical gas pipeline network;

[0048] The pretreatment adsorption tower B3 is connected to the coke oven gas outlet valve 17 of tower B, and the qualified coke oven gas after pretreatment is sent into the pretreatment adsorption tower B3 in reverse, and the pretreatment adsorption tower B3 is finally pressurized and incorporated into the system.

[0049] Another aspect of the present invention provides an improved coke oven gas hydrogen stripping TSA treatment process, comprising the following steps:

[0050] a. The coke oven gas from the gas holder section of the coking unit is pressurized by a screw compressor and enters the temperature swing adsorption (TSA) section;

[0051] b. Coke oven gas first enters the separator to separate the water and oil droplets entrained therein, and then enters from the bottom of the pretreatment adsorption tower;

[0052] c. There are 4 pretreatment adsorption towers in series, 3 of which (the specific number depends on the amount of coke oven gas to be treated) are in the desulfurization and denaphthalene state, and 1 is in the regeneration state. When the regeneration is completed, it will be switched to one of the remaining 3 for pressure equalization according to the program setting sequence. Each pretreatment adsorption tower is equipped with 4 layers of adsorbent, which adsorb tar, water, sulfur, naphthalene and other impurities from bottom to top;

[0053] d. When the pretreatment adsorption tower A2 is saturated with adsorption, it switches to the regeneration pretreatment adsorption tower B3 for pressure equalization and enters the regeneration process;

[0054] e. Regeneration pressure equalization and pressure reduction process: close the cold blowing regeneration gas valve 9 and the regeneration gas steam heater 6, heat the regeneration gas inlet valve 8, open the pressure equalization tower regeneration gas shortcut valve 7, close the tower A coke oven gas inlet valve 10 and tower B coke oven gas inlet valve 16, tower A coke oven gas outlet valve 11 and tower B coke oven gas outlet valve 17, tower A regeneration gas inlet valve 13 and tower B regeneration gas inlet valve 19, tower A regeneration gas outlet valve 14 and tower B regeneration gas outlet valve 20 on the pretreatment adsorption tower A2 and pretreatment adsorption tower B3, respectively, and open the pretreatment adsorption tower A2 and pretreatment adsorption tower B3. The tower A equalizing valve 12 and the tower B equalizing valve 18 on the treatment adsorption tower A2 and the pretreatment adsorption tower B3 are closed, and the tower A decompression gas recovery program-controlled valve 15 and the tower B decompression gas recovery program-controlled valve 21 are closed at the same time; the pretreatment adsorption tower A2 that needs to be regenerated introduces the coke oven gas with a higher pressure (P: 0.2MPa) in the tower along the tower A equalizing valve 12 pipeline into the pretreatment adsorption tower B3 with a lower pressure that has been completed and needs to be put into use, so that the pressure of the pretreatment adsorption tower A2 and the pretreatment adsorption tower B3 is equalized at about 0.1MPa;

[0055] f. Regeneration depressurization process: close the equalizing valve 12 of tower A that needs to be regenerated, and open the depressurized gas recovery program-controlled valve 15 of tower A at the same time; the pretreatment adsorption tower A2 that needs to be regenerated is depressurized at the coke oven gas inlet in the opposite direction of the adsorption direction, that is, in the reverse direction, and the gas (P: 0.1MPa) is discharged to the coke oven gas pipe network in front of the screw compressor through the depressurized gas recovery program-controlled valve 15 of tower A;

[0056] g. Regeneration heating desorption impurity process: close the pressure-equalizing tower regeneration gas shortcut valve 7 and the cold-blowing regeneration gas valve 9, open the heating regeneration gas valve 8 and the tower A regeneration gas inlet valve 13 of the pre-treatment adsorption tower A2 that needs to be regenerated; use the desorption gas (P: 0.03MPa T: 30°C) produced as a by-product of the pressure swing adsorption hydrogen extraction section, after being heated to about 140°C by the regeneration gas steam heater 6, the adsorption layer is purged against the adsorption direction through the tower A regeneration gas inlet valve 13, so that naphthalene, tar, sulfur and other aromatic compounds can be completely desorbed under heating, and the regenerated desorption gas (P: 0.03MPa) is discharged to the analytical gas network through the tower A regeneration gas outlet valve 14;

[0057] h. Regeneration reverse cold blowing adsorbent bed process: turn off the regeneration gas steam heater 6 and the heating regeneration gas valve 8, and open the cold blowing regeneration gas valve 9 at the same time; after the heating desorption is completed, stop heating the regeneration gas, and continue to use normal temperature regeneration gas (P: 0.03MPa T: 30℃) through the tower A regeneration gas inlet valve 13 to purge the adsorption bed in the opposite direction of the inlet direction to cool it to the adsorption temperature; the desorbed gas (P: 0.03MPa) after cold blowing is discharged to the desorption gas network through the tower A regeneration gas outlet valve 14;

[0058] i. Regeneration tower equalization and pressure-raising process: close the cold-blowing regeneration gas valve 9, the regeneration gas steam heater 6 and the heating regeneration gas valve 8, open the equalization tower regeneration gas shortcut valve 7, and respectively close the tower A coke oven gas inlet valve 10 and tower B coke oven gas inlet valve 16, tower A coke oven gas outlet valve 11 and tower B coke oven gas outlet valve 17, tower A regeneration gas inlet valve 13 and tower B regeneration gas inlet valve 19, tower A regeneration gas outlet valve 14 and tower B regeneration gas outlet valve 20 on the pretreatment adsorption tower A2 and the pretreatment adsorption tower B3. The tower A equalizing valve 12 and the tower B equalizing valve 18 on the adsorption tower A2 and the pretreatment adsorption tower B3 are adjusted, and the tower A depressurization gas recovery program-controlled valve 15 and the tower B depressurization gas recovery program-controlled valve 21 are closed at the same time; the coke oven gas with a higher pressure (P: 0.2MPa) from the pretreatment adsorption tower to be regenerated is passed through the tower A equalizing valve 12 and the tower B equalizing valve 18, and the pretreatment adsorption tower B3 with qualified cooling adsorbent is pressurized in the reverse process, so that the pressure of the pretreatment adsorption tower A2 and the pretreatment adsorption tower B3 is equalized at about 0.1MPa;

[0059] j. The process of finally boosting the pressure of the tower after regeneration and incorporating it into the system: close the tower B equalizing valve 18, tower B regeneration gas inlet valve 19, tower B regeneration gas outlet valve 20, tower B depressurization gas recovery program-controlled valve 21 and tower B coke oven gas inlet valve 16 of the pretreatment adsorption tower B3, and open the tower B coke oven gas outlet valve 17 at the same time, and use the qualified coke oven gas after pretreatment to pass through the tower B coke oven gas outlet valve 17, and pressurize the pretreatment adsorption tower B3 after equalization and boosting to the adsorption pressure (P: 0.2MPa) in the reverse direction of the process. At this point, the pretreatment adsorption tower B3 can open the tower B coke oven gas inlet valve 16 and be incorporated into the system for a new round of adsorption.

[0060] Furthermore, the step e and the step i are performed simultaneously, and the step j is performed while the step f, the step g and the step h are performed.

[0061] The coke oven gas pressurized by the screw compressor in the present invention is separated from oil, water and some impurities by a separator, and enters three pretreatment adsorption towers running in parallel from the bottom to remove tar, water, sulfur, naphthalene and other impurities in turn. Qualified coke oven gas comes out from the top of the pretreatment adsorption tower to the low-pressure machine.

[0062] When the pretreatment adsorption tower is saturated with adsorption, it switches to the regeneration process by pressure equalization with the adsorption tower that has completed regeneration.

[0063] The pretreatment adsorption tower that needs to be regenerated will introduce the coke oven gas with higher pressure (P: 0.2MPa) in the tower through the pressure equalizing valve pipeline in reverse process into the pretreatment adsorption tower with lower pressure that has completed regeneration and needs to be put into use, so that the pressure of the two towers is equal to about 0.1MPa.

[0064] The pretreatment adsorption tower that needs to be regenerated is depressurized at the coke oven gas inlet end in the opposite direction of the adsorption, that is, in the reverse direction, and the gas (P: 0.1MPa) is discharged to the coke oven gas pipeline network in front of the screw machine through the pressure-reducing gas recovery programmable valve.

[0065] The desorbed gas (P: 0.03MPa, T: 30℃) produced as a by-product of the pressure swing adsorption hydrogen extraction process is heated to about 140℃ by a regeneration gas steam heater, and then the adsorption layer is purged in the opposite direction of adsorption through the regeneration gas inlet valve, so that naphthalene, tar, H2S and other aromatic compounds can be completely desorbed under heating. The regenerated desorbed gas (P: 0.03MPa) is discharged to the analytical gas network through the regeneration gas outlet valve.

[0066] After the heating and desorption is completed, stop heating the regeneration gas, and continue to use the room temperature regeneration gas (P: 0.03MPa T: 30℃) through the regeneration gas inlet valve to purge the adsorption bed in the opposite direction of the inlet to cool it to the adsorption temperature. The desorbed gas (P: 0.03MPa) after cold blowing is discharged to the analytical gas network through the regeneration gas outlet valve.

[0067] The coke oven gas with a higher pressure (P: 0.2MPa) from the pretreatment adsorption tower that needs to be regenerated is passed through a pressure equalizing valve to reverse the process to increase the pressure of the pretreatment adsorption tower with qualified cooling adsorbent, so that the pressure of the two towers is equal to about 0.1MPa.

[0068] The qualified coke oven gas after pretreatment passes through the coke oven gas outlet valve, and the pretreatment adsorption tower after equalization and pressure boosting is pressurized to the adsorption pressure (P: 0.2MPa) in the reverse process direction. At this point, the pretreatment adsorption tower can open the coke oven gas inlet valve and be integrated into the system for a new round of adsorption.

[0069] The equalizing pressure reduction of the saturation tower regeneration and the equalizing pressure increase of the regeneration completion tower are carried out simultaneously. While the regeneration tower is reducing the pressure → heating to desorb impurities → reverse cold blowing the adsorbent bed, the regeneration completion tower is finally pressurized and incorporated into the system.

[0070] The pressure of the coke oven gas pipeline network from the gas holder section of the coking unit (P: 0.002~0.003MPa) is low, which can maximize the recovery of the coke oven gas discharged from the regeneration tower. The gas holder of the coking unit is generally large in volume, and the depressurized gas recovery programmable valve of the pretreatment adsorption tower can be recovered in succession by controlling the valve opening, which will not affect the normal production of the gas holder section and the coking unit.

[0071] A set of pressure-reducing gas recovery program-controlled valves is added to the pipeline between the regeneration gas outlet valve of the pretreatment adsorption tower and the pretreatment adsorption tower. After the pressure equalization and pressure reduction process of the pretreatment adsorption tower that needs to be regenerated is completed, the pressure equalization valve is closed and the pressure-reducing gas recovery valve is opened to recover this part of the coke oven gas into the coking unit gas cabinet section to the coke oven gas pipeline network.

[0072] This improved process recycles and utilizes the pretreatment adsorption tower that needs to be regenerated. After completing the equalization and pressure reduction process, the coke oven gas discharged during the pressure reduction process is recovered and enters the coking unit gas holder section to the coke oven gas pipeline network. At the same time, the gas composition is stabilized to the maximum extent, which is convenient for the user unit to adjust the working conditions, and provides a new research direction for the optimization and improvement of the TSA treatment process for hydrogen extraction from coke oven gas.

Claims

1. An improved coke oven gas hydrogen extraction TSA treatment device, characterized by: It includes a separator, a pretreatment adsorption tower A, a pretreatment adsorption tower B, a pretreatment adsorption tower C, a pretreatment adsorption tower D, a regeneration gas steam heater, a pressure-equalizing tower regeneration gas shortcut valve, a heating regeneration gas valve, a cold-blowing regeneration gas valve, a tower A coke oven gas inlet valve, a tower A coke oven gas outlet valve, a tower A pressure-equalizing valve, a tower A regeneration gas inlet valve, a tower A regeneration gas outlet valve, a tower A pressure-reducing gas recovery program-controlled valve, a tower B coke oven gas inlet valve, a tower B coke oven gas outlet valve, a tower B pressure-equalizing valve, a tower B regeneration gas inlet valve, a tower B regeneration gas outlet valve and a tower B pressure-reducing gas recovery program-controlled valve; The pretreatment adsorption tower A, the pretreatment adsorption tower B, the pretreatment adsorption tower C and the pretreatment adsorption tower D are connected in parallel, three of which are operated normally and one is regenerated; tar, sulfur and naphthalene impurities in coke oven gas are removed; The separator is connected to the pretreatment adsorption tower A through the coke oven gas inlet valve of the tower A to filter the oil, water and some impurities in the coke oven gas; The separator is connected to the pretreatment adsorption tower B through the coke oven gas inlet valve of the tower B to filter the oil, water and some impurities in the coke oven gas; The pretreatment adsorption tower A2 is connected to the coke oven gas outlet valve (11) of the tower A to send the pretreated coke oven gas to the low pressure machine; The pretreatment adsorption tower B is connected to the coke oven gas outlet valve of the tower B to send the pretreated qualified coke oven gas to the low pressure machine; The pressure-equalizing tower regeneration gas shortcut valve discharges the hydrogen extraction and analysis gas directly to the analysis gas pipeline network, which is convenient for the pressure-equalizing tower of the pretreatment adsorption tower A and the pretreatment adsorption tower B; The pretreatment adsorption tower A and the pretreatment adsorption tower B are connected through the tower A pressure equalizing valve and the tower B pressure equalizing valve; the coke oven gas in the pretreatment adsorption tower A that is saturated with adsorption is pressure-equalized to the pretreatment adsorption tower B that has been regenerated; The pretreatment adsorption tower A is connected to the depressurized gas recovery program-controlled valve of the tower A, and the coke oven gas discharged from the depressurized pretreatment adsorption tower A is recovered to the coke oven gas pipeline network; The heating regeneration gas valve is connected to the regeneration gas steam heater to heat the hydrogen extraction and decomposition gas to 140° C. with steam; The regeneration gas steam heater is connected to the pretreatment adsorption tower A through the regeneration gas inlet valve of the tower A, and the heated regeneration gas is sent to the pretreatment adsorption tower A for high-temperature desorption of impurities; The pretreatment adsorption tower A is connected to the regeneration gas outlet valve of the tower A, and the regeneration gas after high-temperature desorption of impurities is discharged to the analytical gas pipeline network; The cold-blowing regeneration gas valve (9) is connected to the pretreatment adsorption tower A2 through the tower A regeneration gas inlet valve (13), and the hydrogen extraction and decomposition gas is sent to the pretreatment adsorption tower A2 to cool the adsorbent bed; The pretreatment adsorption tower A2 is connected to the regeneration gas outlet valve (14) of the tower A to discharge the regeneration gas after the cold blowing adsorbent bed layer to the analytical gas pipeline network; The pretreatment adsorption tower B is connected to the coke oven gas outlet valve of the tower B, and the qualified coke oven gas after pretreatment is sent into the pretreatment adsorption tower B in reverse, and the pretreatment adsorption tower B is finally pressurized and incorporated into the system.

2. An improved coke oven gas hydrogen extraction TSA treatment process, characterized by: The steps include: a. The coke oven gas from the gas cabinet section of the coking unit is pressurized by the screw compressor and enters the temperature swing adsorption section; b. Coke oven gas first enters the separator to separate the water and oil droplets entrained therein, and then enters from the bottom of the pretreatment adsorption tower; c. There are 4 pretreatment adsorption towers in series, 3 of which are in the desulfurization and naphthalene removal state, and 1 is in the regeneration state. After the regeneration is completed, it is switched to one of the remaining 3 towers for equalization pressure according to the program setting sequence. Each pretreatment adsorption tower is equipped with 4 layers of adsorbent, which adsorb tar, water, sulfur and naphthalene impurities from bottom to top respectively; d. When the pretreatment adsorption tower A is saturated with adsorption, it switches to the regeneration process with the pretreatment adsorption tower B after pressure equalization; e. Regeneration pressure-equalizing and pressure-reducing process: close the cold-blowing regeneration gas valve and the regeneration gas steam heater, heat the regeneration gas inlet valve, open the pressure-equalizing tower regeneration gas shortcut valve, and respectively close the tower A coke oven gas inlet valve and tower B coke oven gas inlet valve, tower A coke oven gas outlet valve and tower B coke oven gas outlet valve, tower A regeneration gas inlet valve and tower B regeneration gas inlet valve, tower A regeneration gas outlet valve and tower B regeneration gas outlet valve on the pretreatment adsorption tower A and pretreatment adsorption tower B, respectively open the tower A equalizing valve and tower B equalizing valve on the pretreatment adsorption tower A and pretreatment adsorption tower B, and simultaneously close the tower A decompression gas recovery program-controlled valve and tower B decompression gas recovery program-controlled valve; the pretreatment adsorption tower A that needs to be regenerated introduces the coke oven gas with a higher pressure in the tower into the pretreatment adsorption tower B3 with a lower pressure that has been completed and needs to be put into use along the tower A equalizing valve pipeline, wherein the pressure of the coke oven gas is 0.2MPa, so that the pressure of the pretreatment adsorption tower A and the pretreatment adsorption tower B is equalized at about 0.1MPa; f. Regeneration depressurization process: close the equalizing valve of tower A that needs to be regenerated, and open the depressurized gas recovery program-controlled valve of tower A at the same time; the pretreatment adsorption tower A that needs to be regenerated is depressurized in the opposite direction of the adsorption direction, that is, in the reverse direction at the coke oven gas inlet end, and the gas is discharged to the coke oven gas pipe network in front of the screw machine through the depressurized gas recovery program-controlled valve of tower A, where the gas pressure is 0.1MPa; g. Regeneration heating desorption impurity process: close the pressure-equalizing tower regeneration gas shortcut valve and the cold-blowing regeneration gas valve, open the heating regeneration gas valve and the tower A regeneration gas inlet valve of the pretreatment adsorption tower A to be regenerated; the desorbed gas produced as a byproduct of the pressure swing adsorption hydrogen extraction section is heated to 140° C. by a regeneration gas steam heater (6), wherein the pressure of the desorbed gas is 0.03 MPa and the temperature is 30° C., and the adsorption layer is purged against the adsorption direction through the tower A regeneration gas inlet valve, so that naphthalene, tar, sulfur and other aromatic compounds can be completely desorbed under heating, and the regenerated desorbed gas is discharged to the analytical gas network through the tower A regeneration gas outlet valve, wherein the pressure of the desorbed gas is 0.03 MPa; h. Regeneration reverse cold blowing adsorbent bed process: turn off the regeneration gas steam heater and the heating regeneration gas valve, and open the cold blowing regeneration gas valve at the same time; after the heating desorption is completed, stop heating the regeneration gas, and continue to use normal temperature regeneration gas through the tower A regeneration gas inlet valve, where the pressure of the normal temperature regeneration gas is 0.03MPa and the temperature is 30℃, and purge the adsorption bed in the opposite direction of the inlet direction to cool it to the adsorption temperature; the desorbed gas after cold blowing is discharged to the desorption gas network through the tower A regeneration gas outlet valve, where the pressure of the desorbed gas is 0.03MPa; i. Regeneration completion tower equalizing pressure boosting process: close the cold blowing regeneration gas valve, the regeneration gas steam heater and the heating regeneration gas valve, open the equalizing tower regeneration gas shortcut valve, close the tower A coke oven gas inlet valve and tower B coke oven gas inlet valve, tower A coke oven gas outlet valve and tower B coke oven gas outlet valve, tower A regeneration gas inlet valve and tower B regeneration gas inlet valve, tower A regeneration gas outlet valve and tower B regeneration gas outlet valve on the pretreatment adsorption tower A and pretreatment adsorption tower B respectively, open the tower A equalizing valve and tower B equalizing valve on the pretreatment adsorption tower A and pretreatment adsorption tower B, and close the tower A decompression gas recovery program-controlled valve and tower B decompression gas recovery program-controlled valve at the same time; use the coke oven gas with a higher pressure from the pretreatment adsorption tower that needs to be regenerated to pass through the tower A equalizing valve and the tower B equalizing valve, where the coke oven gas pressure is 0.2MPa, and reverse the process to boost the pretreatment adsorption tower B with qualified cooling adsorbent, so that the pressure of the pretreatment adsorption tower A and the pretreatment adsorption tower B is equalized at about 0.1MPa; j. The process of final pressurization and integration into the system after the regeneration tower is completed: close the tower B equalizing valve, tower B regeneration gas inlet valve, tower B regeneration gas outlet valve, tower B depressurization gas recovery program-controlled valve and tower B coke oven gas inlet valve of the pretreatment adsorption tower B, and open the tower B coke oven gas outlet valve at the same time, and use the qualified coke oven gas after pretreatment to pass through the tower B coke oven gas outlet valve, and pressurize the pretreatment adsorption tower B after equalization and pressure boosting to the adsorption pressure in the reverse process direction. The adsorption pressure is 0.2MPa. At this point, the pretreatment adsorption tower B can open the tower B coke oven gas inlet valve and be integrated into the system for a new round of adsorption.

3. The improved coke oven gas hydrogen stripping TSA treatment process according to claim 2 is characterized by: The step e is performed synchronously with the step i, and the step j is performed while the step f, the step g and the step h are performed.

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