CN209782234U - Utilize and produce surplus hydrogen for sealed recovery reservoir tail gas device - Google Patents
Utilize and produce surplus hydrogen for sealed recovery reservoir tail gas device Download PDFInfo
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- CN209782234U CN209782234U CN201920311577.2U CN201920311577U CN209782234U CN 209782234 U CN209782234 U CN 209782234U CN 201920311577 U CN201920311577 U CN 201920311577U CN 209782234 U CN209782234 U CN 209782234U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/30—Hydrogen technology
- Y02E60/34—Hydrogen distribution
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P90/00—Enabling technologies with a potential contribution to greenhouse gas [GHG] emissions mitigation
- Y02P90/45—Hydrogen technologies in production processes
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Abstract
The utility model relates to an utilize device from producing surplus hydrogen for sealed recovery oil depot tail gas, including diffusing gas dashpot, draught fan, hydrogen dashpot, pressure regulating valve, relief pressure valve, hydrogen self-supporting governing valve, nitrogen gas self-supporting governing valve, relief valve one, relief valve two, valve one, valve two, pressure recording control instrument PRC01 and pressure recording control instrument PRC 02. The beneficial effects are as follows: the surplus hydrogen produced by the PSA hydrogen production unit is used as a sealed gas source of the oil depot diffused gas system, and the diffused gas is recycled and sent to the raw material gas pipeline of the PSA hydrogen production unit under a controllable state, so that the problem of direct discharge of the diffused gas of the oil depot can be solved, the environmental pollution is reduced, the cost is low, and the oil depot hydrogen production system is energy-saving and environment-friendly.
Description
Technical Field
the utility model relates to a metallurgical coking technical field especially relates to an utilize device of surplus hydrogen for sealed recovery oil depot tail gas from the product.
background
In the metallurgical coking industry, the benzene hydrogenation device comprises a PSA pressure swing adsorption hydrogen production unit, a main device (comprising a pretreatment unit, a hydrogenation unit, an extractive distillation unit and a xylene distillation unit), an oil depot unit (comprising a raw material storage tank, a product storage tank and the like) and an automobile loading platform. The device comprises a main device, a negative pressure coal gas system and a negative pressure coal gas system, wherein the middle tank of the main device diffuses gas which takes nitrogen as sealing gas and is introduced into the negative pressure coal gas system through the diffusion tank; because of the particularity of the loading and unloading truck, the current loading and unloading truck adopts the absorption method mostly, and because the absorption effect of the washing oil on benzene gas is very good, the loading and unloading truck also adopts the condensation adsorption method; the oil depot adopts a metal inner floating roof tank without any sealing measure and is directly connected with the atmosphere. In recent years, with the gradual increase of national environmental protection requirements, ultra-clean emission is gradually rising, and the ultra-clean emission index also becomes one of the indexes which are preferably considered in the advanced selection of the production process. For an oil depot of a benzene hydrogenation device, although a metal inner floating roof tank is adopted, the requirement of ultra-clean discharge cannot be met, and the solution can meet the requirement in the same nitrogen sealing mode as that of a main device. However, this solution leads to an increase in the exhaust gas emission of the whole device, and during the peak period of the exhaust gas emission, it is highly likely to affect the quality of the gas in the gas suction pipeline and the stability of the operation of the gas purification system.
the hydrogen produced by the PSA pressure swing adsorption hydrogen production unit in the benzene hydrogenation device has a certain surplus, and the hydrogen produced by the PSA pressure swing adsorption hydrogen production unit has the hydrogen amount of 1700Nm (nanometers ) by taking the scale of 10 ten thousand t/a crude benzene hydrogenation as an example3The hydrogen production capacity is at least 200Nm3About/h, if the gas storage tank is used as a sealed gas source, the flow rate of the gas storage tank completely meets the requirement, and because the oil storage tank adopts a metal inner floating roof tank, the benzene vapor amount is very small, the tail gas is very clean and basically hydrogen, the gas storage tank can be directly mixed with the raw gas of the PSA pressure swing adsorption hydrogen production unit, namely the coal gas, to serve as the gas source, and the PSA pressure swing adsorption hydrogen production unit also has certain oil removal capacity, so that the waste gas amount of the diffused gas introduced into a negative pressure coal gas system can be reduced, of course, the part of the gas storage tank can also be introduced into the negative pressure coal gas system by taking the hydrogen as the tail gas of the sealed gas, and has no influence on.
in addition, in terms of price, because hydrogen is not consumed in the process of being used as sealing gas, and tail gas returns to raw material coal gas of the PSA hydrogen production unit, the processing cost of hydrogen is only considered, the processing cost of PSA hydrogen production is less than 0.5 yuan per cubic meter, and is close to the price of nitrogen, so the cost is reasonable, and the key is that the surplus hydrogen can be reasonably utilized.
Therefore, the process of using the surplus hydrogen produced by the PSA pressure swing adsorption hydrogen production unit as the oil depot sealing gas is scientific, economic and feasible, and needs to be researched and developed urgently.
SUMMERY OF THE UTILITY MODEL
For overcoming the prior art defect, the utility model provides an utilize from producing device of surplus hydrogen for sealed recovery oil depot tail gas is provided, the surplus hydrogen that adopts PSA pressure swing adsorption hydrogen manufacturing unit production is as the sealed air supply of oil depot gas system of diffusing, retrieves the raw materials gas pipeline of giving PSA pressure swing adsorption hydrogen manufacturing unit to the gas of diffusing under controllable state, can solve the direct outer row problem of gas that diffuses in oil depot, reduce environmental pollution, and is with low costs, energy-concerving and environment-protective.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
The device for recovering the tail gas of the oil depot by using the self-produced surplus hydrogen as a seal is characterized by comprising a diffused gas buffer tank, an induced draft fan, a hydrogen buffer tank, a pressure regulating valve, a pressure reducing valve, a hydrogen self-standing regulating valve, a nitrogen self-standing regulating valve, a first safety valve, a second safety valve, a first valve, a second valve, a pressure recording control instrument PRC01 and a pressure recording control instrument PRC02, wherein the pressure reducing valve, the hydrogen buffer tank and the hydrogen self-standing regulating valve are sequentially connected and are arranged on a hydrogen pipeline of a benzene-sending hydrogenation main device of a PSA pressure swing adsorption hydrogen production unit and led out and respectively connected to the hydrogen pipelines at the top of each oil depot; the pressure regulating valve is interlocked with a pressure recording control instrument PRC01 and is arranged on a diffused tail gas system pipeline which is led out from a diffused port at the top of each oil depot and is connected into a diffused gas buffer tank in a gathering way, after an induced draft fan arranged behind the diffused gas buffer tank is interlocked with the pressure recording control instrument PRC02, one path of the induced draft fan is connected with a first valve and then is connected into a hydrogen production gas pipeline of a PSA pressure swing adsorption hydrogen production unit, and the other path of the induced draft fan is connected with a second valve and then is connected into a main benzene hydrogenation device diffused pipe; the first safety valve is arranged on a safety pressure relief pipeline between the rear part of the pressure reducing valve and the rear part of the induced draft fan; the second safety valve is arranged on a safety pressure relief pipeline between the hydrogen self-supporting regulating valve and the diffused gas buffer tank; and the nitrogen self-supporting regulating valve is led out from the nitrogen main pipe and is connected to a hydrogen pipeline behind the hydrogen self-supporting regulating valve and in front of the safety valve II.
the maximum flow of the pressure reducing valve, the hydrogen self-supporting regulating valve and the nitrogen self-supporting regulating valve is the peak flow of the oil depot sealing system. The maximum flow of the pressure reducing valve, the hydrogen self-supporting regulating valve and the nitrogen self-supporting regulating valve is the peak flow of the oil depot sealing system.
The induced draft fan is a variable-frequency adjustable induced draft fan.
The storage tanks of the oil depot all adopt metal inner floating roof tanks, if a fixed roof tank is adopted, an oil washing and cleaning system is additionally arranged in front of an induced draft fan.
Compared with the prior art, the beneficial effects of the utility model are that:
1) The excessive hydrogen produced by the PSA pressure swing adsorption hydrogen production unit owned by the benzene hydrogenation device is used for replacing nitrogen as a sealed gas source of a diffused gas system, and the diffused gas is sent back to the raw material coal gas of the PSA pressure swing adsorption hydrogen production unit under a controllable state, so that the nitrogen introduced into a negative pressure coal gas system can be reduced, and the influence on the coal gas quality of a coal gas pipeline is reduced;
2) the process of the utility model only utilizes hydrogen, and because hydrogen is not consumed in the process of being used as sealing gas, tail gas returns to the raw material gas of the PSA pressure swing adsorption hydrogen production unit, and the raw material gas is not consumed, so only the processing cost of hydrogen is considered, the processing cost of hydrogen is close to the price of nitrogen, but the cost of nitrogen making equipment is saved, the cost is low, and the process is easy to realize;
3) The hydrogen is adopted to replace the nitrogen, the gas source is stable and reliable, and the condition that the nitrogen cannot be supplemented in time during the peak period and a large amount of air enters a negative pressure gas system in the prior art can be avoided;
4) The problem of direct discharge of oil depot diffused gas is solved, and environmental pollution is reduced.
Drawings
fig. 1 is a schematic view of the process of the present invention.
In the figure: 1-oil depot 2-gas diffusion buffer tank 3-induced draft fan 4-hydrogen buffer tank 5-pressure regulating valve 6-pressure reducing valve 7-hydrogen self-supporting regulating valve 8-nitrogen self-supporting regulating valve 9-safety valve I10-safety valve II 11-valve I12-valve II 13-PSA pressure swing adsorption hydrogen production unit 14-benzene hydrogenation main device diffusion tank 15-hydrogen production gas pipeline 16-benzene removal hydrogenation main device hydrogen pipeline 17-gas purge gas 18-benzene hydrogenation main device diffusion header pipe 19-gas absorption pipeline PRC01/PRC 02-pressure recording control instrument
Detailed Description
the following description of the embodiments of the present invention will be made with reference to the accompanying drawings:
As shown in fig. 1, a device for recovering oil depot tail gas in a sealed manner by using self-produced surplus hydrogen, which comprises a diffused gas buffer tank 2, an induced draft fan 3, a hydrogen buffer tank 4, a pressure regulating valve 5, a pressure reducing valve 6, a hydrogen self-supporting regulating valve 7, a nitrogen self-supporting regulating valve 8, a first safety valve 9, a second safety valve 10, a first valve 11, a second valve 12, a pressure recording control instrument PRC01 and a pressure recording control instrument PRC02, wherein the pressure reducing valve 6, the hydrogen buffer tank 4 and the hydrogen self-supporting regulating valve 7 are sequentially connected, are arranged on a hydrogen pipeline 16 of a benzene-sending and hydrogenation main device of a PSA pressure swing adsorption hydrogen production unit 13, are led out and respectively connected to hydrogen pipelines at the tops of the oil depots 1, and the self-produced surplus hydrogen are respectively sent to the top spaces of the oil depots 1 to form a hydrogen sealing system, and are used for sealing the hydrogen; the pressure regulating valve 5 is interlocked with a pressure recording control instrument PRC01, is arranged on a diffused tail gas system pipeline which is led out from a diffusion port at the top of each oil depot 1 and is connected into a diffused gas buffer tank 2 in a gathering way, an induced draft fan 3 arranged behind the diffused gas buffer tank 2 is interlocked with a pressure recording control instrument PRC02, one path of the induced draft fan 3 is connected with a first valve 11 and then connected into a hydrogen production gas pipeline 15 of a PSA pressure swing adsorption hydrogen production unit 13, the other path of the induced draft fan is connected with a second valve 12 and then connected onto a benzene hydrogenation main device diffusion main pipe 18, and the induced draft fan is sent to a gas absorption pipeline 19 of a gas purification system through a benzene hydrogenation main device diffusion tank; the selection of the gas circuit is controlled by a first valve 11 and a second valve 12; the safety valve I9 is arranged on a safety pressure relief pipeline between the back of the pressure reducing valve 6 and the back of the induced draft fan 3, and when the pressure of hydrogen passing through the pressure reducing valve 6 is more than or equal to 0.1MPa, redundant hydrogen is discharged and recycled, so that the safety of the system is ensured; the second safety valve 10 is arranged on a safety pressure relief pipeline between the back of the hydrogen self-supporting regulating valve 7 and the diffused gas buffer tank 2, and when the pressure of the hydrogen passing through the hydrogen self-supporting regulating valve 7 is more than or equal to 50kPa, redundant hydrogen is discharged and recycled, so that the safety of the system is ensured; the nitrogen gas self-supporting regulating valve 8 is led out from a nitrogen gas main pipe, is connected to a hydrogen pipeline behind the hydrogen gas self-supporting regulating valve 7 and before the safety valve II 10, and is used as a standby gas source of an oil depot sealing system during opening and shutdown, namely, when a main process device is operated before and after shutdown and has no hydrogen output, the nitrogen gas from the nitrogen gas main pipe is used for sealing the oil depot, and the direct emission of tail gas of the oil depot 1 is prevented from causing environmental pollution.
The maximum flow of the decompression 6, the hydrogen self-supporting regulating valve 7 and the nitrogen self-supporting regulating valve 8 is the peak flow of the oil depot sealing system.
The induced draft fan 3 is a variable-frequency adjustable induced draft fan.
The oil depot 1 adopts a metal inner floating roof tank in the storage tank, and if a fixed roof tank is adopted, an oil washing and cleaning system is additionally arranged in front of the induced draft fan 3.
The working principle comprises the following steps:
1) The hydrogen for sealing is led out from a hydrogen pipeline 16 of a benzene hydrogenation main device sent from a PSA (pressure swing adsorption) hydrogen production unit 13, is decompressed to 0.1MPa (1.6 MPa before decompression) by a decompression valve 6 and then is sent to a hydrogen buffer tank 4, is buffered and then is respectively sent to the top space of each oil depot 1 after the pressure of the hydrogen after being controlled to be 50kPa by a hydrogen self-supporting regulating valve 7, and the hydrogen for sealing each oil depot is implemented;
2) the diffused tail gas is led out from the diffusion ports at the top of each oil depot 1, the pressure of a diffused tail gas system is controlled and kept at 50kPa stably through a pressure regulating valve 5 (controlled by a pressure recording control instrument PRC01 in an interlocking manner), the redundant diffused tail gas is sent into a diffused gas buffer tank 2 and sent out by a draught fan 3 in two paths, one path of the diffused tail gas is sent into a hydrogen production gas pipeline 15 of a PSA (pressure swing adsorption) hydrogen production unit 13 to be recycled, the other path of the diffused tail gas is sent into a main benzene hydrogenation device diffusion header 18 for standby, and the diffused tail gas is sent into a gas absorption pipeline 19 of a gas purification system through a main benzene hydrogenation device diffusion tank 14 to be recycled;
3) When the pressure recording control instrument PRC02 shows that the pressure of the pipeline in front of the induced draft fan 3 is greater than or less than 10kPa, adjusting and controlling the induced draft rate of the induced draft fan 3, and keeping the pressure of the pipeline in front of the induced draft fan 3 constant at about 10 kPa;
4) The excessive hydrogen (more than or equal to 0.1MPa) behind the pressure reducing valve 6 is connected into a tail gas diffusing pipeline behind the induced draft fan 3 through a safety valve (I) 9 and is recycled;
5) The excessive hydrogen (more than or equal to 0.1MPa) behind the hydrogen self-supporting regulating valve is connected into a diffused gas buffer tank 2 in front of an induced draft fan 3 through a safety valve (II) 10 and is recycled;
6) nitrogen gas is drawn out from the nitrogen gas house steward, after reducing pressure to 50kPa through nitrogen gas self-supporting governing valve 8, insert behind the hydrogen self-supporting governing valve 7, on the hydrogen pipeline before the second 10 of relief valve, as the reserve air supply of the oil depot sealing system when opening, shutting down, before the main process units opens the worker, after shutting down promptly, when not having the hydrogen output, utilize the nitrogen gas sealing oil depot that comes from the nitrogen gas house steward, prevent that 1 tail gas of oil depot from directly diffusing outward, the polluted environment.
the above, only be the concrete implementation of the preferred embodiment of the present invention, but the protection scope of the present invention is not limited thereto, and any person skilled in the art is in the technical scope of the present invention, according to the technical solution of the present invention and the utility model, the concept of which is equivalent to replace or change, should be covered within the protection scope of the present invention.
Claims (2)
1. The device for recovering the tail gas of the oil depot by using the self-produced surplus hydrogen as a seal is characterized by comprising a diffused gas buffer tank, an induced draft fan, a hydrogen buffer tank, a pressure regulating valve, a pressure reducing valve, a hydrogen self-standing regulating valve, a nitrogen self-standing regulating valve, a first safety valve, a second safety valve, a first valve, a second valve, a pressure recording control instrument PRC01 and a pressure recording control instrument PRC02, wherein the pressure reducing valve, the hydrogen buffer tank and the hydrogen self-standing regulating valve are sequentially connected and are arranged on a hydrogen pipeline of a benzene-sending hydrogenation main device of a PSA pressure swing adsorption hydrogen production unit and led out and respectively connected to the hydrogen pipelines at the top of each oil depot; the pressure regulating valve is interlocked with a pressure recording control instrument PRC01 and is arranged on a diffused tail gas system pipeline which is led out from a diffused port at the top of each oil depot and is connected into a diffused gas buffer tank in a gathering way, after an induced draft fan arranged behind the diffused gas buffer tank is interlocked with the pressure recording control instrument PRC02, one path of the induced draft fan is connected with a first valve and then is connected into a hydrogen production gas pipeline of a PSA pressure swing adsorption hydrogen production unit, and the other path of the induced draft fan is connected with a second valve and then is connected into a main benzene hydrogenation device diffused pipe; the first safety valve is arranged on a safety pressure relief pipeline between the rear part of the pressure reducing valve and the rear part of the induced draft fan; the second safety valve is arranged on a safety pressure relief pipeline between the hydrogen self-supporting regulating valve and the diffused gas buffer tank; and the nitrogen self-supporting regulating valve is led out from the nitrogen main pipe and is connected to a hydrogen pipeline behind the hydrogen self-supporting regulating valve and in front of the safety valve II.
2. The device for recovering the tail gas of the oil depot by utilizing the self-produced surplus hydrogen for sealing as claimed in claim 1, wherein the maximum flow of the pressure reducing valve, the hydrogen self-supporting regulating valve and the nitrogen self-supporting regulating valve is the peak flow of the oil depot sealing system.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920311577.2U CN209782234U (en) | 2019-03-12 | 2019-03-12 | Utilize and produce surplus hydrogen for sealed recovery reservoir tail gas device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920311577.2U CN209782234U (en) | 2019-03-12 | 2019-03-12 | Utilize and produce surplus hydrogen for sealed recovery reservoir tail gas device |
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| Publication Number | Publication Date |
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| CN209782234U true CN209782234U (en) | 2019-12-13 |
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| CN201920311577.2U Active CN209782234U (en) | 2019-03-12 | 2019-03-12 | Utilize and produce surplus hydrogen for sealed recovery reservoir tail gas device |
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