CN212687577U

CN212687577U - Hydrogen production tail gas recycle device

Info

Publication number: CN212687577U
Application number: CN202021036600.0U
Authority: CN
Inventors: 从洪伦
Original assignee: Hami Runda Jianeng Power Generation Co ltd
Current assignee: Xinjiang Xinyi Carbon Energy Environmental Protection Technology Co ltd
Priority date: 2020-06-09
Filing date: 2020-06-09
Publication date: 2021-03-12
Anticipated expiration: 2030-06-09

Abstract

The utility model discloses a hydrogen production tail gas recycle device, which comprises a methanol purge gas storage tank, a pretreatment unit, a PSA adsorption unit, a first output pipe, a reflux pipe, a hydrogen detector, a drying device, a compression device, a liquid ammonia storage tank, an air separation device, a deoxidation device, a second output pipe, an auxiliary reflux pipe and a nitrogen detector, wherein the output end of the methanol purge gas storage tank is connected with the pretreatment unit, the output end of the pretreatment unit is connected with the PSA adsorption unit, the output end of the PSA adsorption unit is provided with the first output pipe to be connected with the input end of the drying device, and the reflux pipe is arranged on the first output pipe to be connected with the pretreatment unit, so that the purity of hydrogen is improved by the arrangement of the PSA adsorption unit and the hydrogen detector, the hydrogen-rich tail gas and the waste nitrogen discharged by the air separation device are recycled, and the overall, a plurality of return pipes and detectors are arranged, so that substandard gas can be returned for reprocessing and recycling.

Description

Hydrogen production tail gas recycle device

Technical Field

The utility model relates to a hydrogen manufacturing technical field, concretely relates to hydrogen manufacturing tail gas recycle device.

Background

In the project for preparing the methanol from the coke oven gas, on one hand, the coke oven gas is rich in hydrogen and deficient in carbon, the content of hydrogen per se reaches 60 percent, even if the methanol preparation process adopts the conversion of pure oxygen in the coke oven gas to convert methane in the coke oven gas into CO, the hydrogen-carbon ratio in the converted synthesis gas feed gas is far higher than the ideal ratio required by the methanol synthesis, a large amount of hydrogen exists in purge gas, the purge gas is used as production waste gas of a methanol device, the volume fraction of the hydrogen is more than 70 percent and can be used as the feed gas for purifying the hydrogen, but the current purge gas is used as the waste gas, so that the utilization rate of the coke oven gas is reduced. On the other hand, coke oven gas requires pure oxygen in methane pure oxygen conversion, so an air separation device is generally configured, the air separation device only provides oxygen required for conversion for methanol production, and nitrogen does not participate in the process and is discharged as waste gas. Therefore, the hydrogen-rich tail gas and the exhaust gas N2 discharged by the air separation device need to be recycled, and the economic benefit of the device is increased.

SUMMERY OF THE UTILITY MODEL

The utility model aims at overcoming the defects of the prior art and providing a hydrogen production tail gas recycling device, which comprises a methanol purge gas storage tank, a pretreatment unit, a PSA adsorption unit, a first output pipe, a reflux pipe, a hydrogen detector, a drying device, a compression device, a liquid ammonia storage tank, an air separation device, a deoxidation device, a second output pipe, an auxiliary reflux pipe and a nitrogen detector, wherein the output end of the methanol purge gas storage tank is connected with the pretreatment unit, the output end of the pretreatment unit is connected with the PSA adsorption unit, the output end of the PSA adsorption unit is provided with the first output pipe which is connected with the input end of the drying device, the reflux pipe is connected with the pretreatment unit on the first output pipe, the hydrogen detector is arranged in the reflux pipe, the input end of the drying device is connected with the deoxidation device by arranging the second output pipe, and the input end, the second output tube is provided with an auxiliary return pipe connected with an air separation device, a nitrogen detector is arranged in the second output tube, and the output end of the drying device is connected with a liquid ammonia storage tank through a compression device.

Preferably, the methanol purge gas storage tank, the pretreatment unit, the PSA adsorption unit, the drying device, the compression device, the liquid ammonia storage tank, the air separation device and the deoxygenation device are directly connected through a conveying pipe, and a control valve is arranged in the conveying pipe.

Preferably, the PSA adsorption unit includes a first PSA adsorption column and a second PSA adsorption column, and the first PSA adsorption column and the second PSA adsorption column are connected in parallel, and output ends thereof are connected to the first output pipe.

Preferably, a first flow control valve is arranged in the return pipe, a second flow control valve is arranged in the auxiliary return pipe, and the first output pipe and the second output pipe are communicated with each other.

The utility model has the advantages that: simple structure, high durability and convenient operation, the purity that will improve its hydrogen through the setting of PSA adsorption unit cooperation hydrogen detector, be convenient for follow-up and nitrogen gas synthetic product liquid ammonia, realize that rich hydrogen tail gas and air separation plant discharge waste nitrogen gas and carry out recycle, increase the whole economic benefits of device, set up a plurality of back flows and detector simultaneously, will prevent the gaseous synthetic product not up to standard, can return to the processing unit retreatment with not up to standard gas, recycle carries out, avoid its discharge and influence synthetic product liquid ammonia.

Drawings

The invention will now be described, by way of example, with reference to the accompanying drawings, in which:

fig. 1 is a schematic structural diagram of the present invention.

In the figure: 1. a methanol purge gas storage tank; 2. a pre-processing unit; 3. a PSA adsorption unit; 4. a first output pipe; 5. a return pipe; 6. a hydrogen detector; 7. a drying device; 8. a compression device; 9. a liquid ammonia storage tank; 10. an air separation plant; 11. a deoxidation device; 12. a second output pipe; 13. an auxiliary return pipe; 14. a nitrogen detector; 15. a second flow control valve; 16. a control valve; 17. a delivery pipe; 18. a first PSA adsorption column; 19. a second PSA adsorption column; 20. a first flow control valve.

Detailed Description

Any feature disclosed in this specification may be replaced by alternative features serving equivalent or similar purposes, unless expressly stated otherwise. That is, unless expressly stated otherwise, each feature is only an example of a generic series of equivalent or similar features.

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

In the description of the present invention, it should be noted that the terms "upper", "lower", "inner", "outer", "front end", "rear end", "both ends", "one end", "the other end", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element to be referred must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted", "provided", "connected", and the like are to be construed broadly, such as "connected", which may be a fixed connection including welding, riveting, bonding, and the like; or the detachable connection comprises a threaded connection, a key connection, a pin connection and the like; or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

As shown in fig. 1, a hydrogen production tail gas recycling device includes a methanol purge gas storage tank 1, a pretreatment unit 2, a PSA adsorption unit 3, a first output pipe 4, a return pipe 5, a hydrogen detector 6, a drying device 7, a compression device 8, a liquid ammonia storage tank 9, an air separation device 10, a deoxidation device 11, a second output pipe 12, an auxiliary return pipe 13 and a nitrogen detector 14, wherein an output end of the methanol purge gas storage tank 1 is connected with the pretreatment unit 2, an output end of the pretreatment unit 2 is connected with the PSA adsorption unit 3, an output end of the PSA adsorption unit 3 is provided with the first output pipe 4 connected with an input end of the drying device 7, the return pipe 5 is provided on the first output pipe 4 and connected with the pretreatment unit 2, the hydrogen detector 6 is provided in the return pipe 5, an input end of the drying device 7 is connected with the deoxidation device 11 by providing the second output pipe 12, and an input end of the, an auxiliary return pipe 13 is arranged on the second output pipe 12 and connected with an air separation device 10, a nitrogen detector 14 is arranged in the second output pipe 12, and the output end of the drying device 7 is connected with a liquid ammonia storage tank 9 through a compression device 8. The methanol purge gas storage tank 1, the pretreatment unit 2, the PSA adsorption unit 3, the drying device 7, the compression device 8, the liquid ammonia storage tank 9, the air separation device 10 and the deoxidation device 11 are directly connected through a delivery pipe 17, and a control valve 16 is arranged in the delivery pipe 17. The PSA adsorption unit 3 comprises a first PSA adsorption tower 18 and a second PSA adsorption tower 19, the first PSA adsorption tower 18 and the second PSA adsorption tower 19 are connected in parallel, and the output ends of the first PSA adsorption tower 18 and the second PSA adsorption tower 19 are connected with a first output pipe 4. A first flow control valve 20 is arranged in the return pipe 5, a second flow control valve 15 is arranged in the auxiliary return pipe 13, and the first output pipe 4 is communicated with the second output pipe 12. The hydrogen detector 6 and the first flow control valve 20, the nitrogen detector 14 and the second flow control valve 15 are all electrically connected with the controller. The parallel arrangement of the first PSA adsorption tower 18 and the second PSA adsorption tower 19 can alternately perform adsorption and regeneration during the adsorption treatment, thereby ensuring that the impurities in the tail gas can be normally adsorbed.

The working principle of the specific embodiment is as follows: firstly, hydrogen-rich gas discharged from a methanol purge gas storage tank 1 passes through a pretreatment unit 2 and a PSA adsorption unit, then high-purity hydrogen is separated from nitrogen collected by an air separation device 10, the nitrogen passes through a deoxidation device 11, then passes through a second output pipe 12 to be mixed with the high-purity hydrogen in a first output pipe 4, then passes through a drying device 7 and a compression device 8 in sequence to synthesize a product liquid ammonia, the product liquid ammonia enters a liquid ammonia storage tank 9, a hydrogen detector 6 detects whether the hydrogen reaches the standard or not in the hydrogen output process, if the hydrogen does not reach the standard, a control valve 16 in the first output pipe 4 is closed, a first flow control valve 20 in a return pipe 5 is opened to enable the gas which does not reach the standard to flow back to the pretreatment unit 2, the gas is treated again, so that the effects of cyclic treatment and recycling are achieved, and meanwhile, if the nitrogen detector 14 detects whether the nitrogen reaches the standard or not, if the nitrogen does not reaches the standard, the control valve 16 in the second output pipe The target gas flows back to the air separation device 10 and is treated again, so that the influence on the product liquid ammonia caused by the substandard output gas is avoided.

The present invention is not limited to the foregoing embodiments. The invention extends to any novel feature or any novel combination of features disclosed in this specification, and to any novel method or process steps or any novel combination of features disclosed.

Claims

1. The utility model provides a hydrogen production tail gas recycle device, relaxs gassing storage tank (1), preprocessing unit (2), PSA adsorption unit (3), first output tube (4), back flow (5), hydrogen detector (6), drying device (7), compressor arrangement (8), liquid ammonia storage jar (9), air separation unit (10), deoxidation device (11), second output tube (12), supplementary back flow (13) and nitrogen gas detector (14) including methyl alcohol, its characterized in that: the output end of the methanol purge gas storage tank (1) is connected with the pretreatment unit (2), the output end of the pretreatment unit (2) is connected with the PSA adsorption unit (3), the output end of the PSA adsorption unit (3) is provided with a first output pipe (4) connected with the input end of a drying device (7), a return pipe (5) is arranged on the first output pipe (4) and is connected with the pretreatment unit (2), a hydrogen detector (6) is arranged in the return pipe (5), the input end of the drying device (7) is connected with a deoxidizing device (11) by arranging a second output pipe (12), the input end of the deoxidizing device (11) is connected with an air separation device (10), an auxiliary return pipe (13) is arranged on the second output pipe (12) and is connected with an air separation device (10), and set up nitrogen gas detector (14) in second output tube (12), drying device (7) output passes through compressor arrangement (8) and is connected with liquid ammonia storage jar (9).

2. The hydrogen production tail gas recycling device according to claim 1, characterized in that: methanol purge gas storage tank (1), pretreatment unit (2), PSA adsorption unit (3), drying device (7), compression device (8), liquid ammonia storage jar (9), air separation plant (10) and deoxidation device (11) are all directly connected through conveyer pipe (17), and are provided with control valve (16) in conveyer pipe (17).

3. The hydrogen production tail gas recycling device according to claim 1, characterized in that: the PSA adsorption unit (3) comprises a first PSA adsorption tower (18) and a second PSA adsorption tower (19), the first PSA adsorption tower (18) and the second PSA adsorption tower (19) are connected in parallel, and the output ends of the first PSA adsorption tower and the second PSA adsorption tower are connected with a first output pipe (4).

4. The hydrogen production tail gas recycling device according to claim 1, characterized in that: a first flow control valve (20) is arranged in the return pipe (5), a second flow control valve (15) is arranged in the auxiliary return pipe (13), and the first output pipe (4) is communicated with the second output pipe (12).