Hydrogen-containing waste gas purification treatment system

Abstract

The utility model belongs to the technical field of hydrogen recovery, and discloses a hydrogen-containing waste gas purification treatment system which comprises a reforming analysis gas pipeline, a water cooler, a buffer tank, a feed gas compressor, a first cooler, a first liquid separation tank, a second cooler, a second liquid separation tank, a raw material pretreatment tank and a hydrogen production purification system, the system comprises a reforming device, a diesel oil hydrofining device and a diesel oil hydro-upgrading device, a reforming desorption gas pipeline is connected into a water cooler, the water cooler is communicated with a buffer tank through a feed gas pipeline, and a feed gas compressor comprises a first-stage compressor and a second-stage compressor. The raw material gas is pressurized and recovered by the raw material gas compressor and then is conveyed to the VPSA and PSA devices to recover hydrogen, so that the hydrogen production is efficient, the hydrogen utilization is reasonable, the recovery is sufficient, the problems of unreasonable hydrogen utilization rate and insufficient recovery are solved, the hydrogen cost is reduced, the fuel gas is saved, and the economic benefit of the whole plant is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of hydrogen recovery, and in particular to a hydrogen-containing waste gas purification and processing system. Background Art

[0002] After collecting statistics on hydrogen usage and output data of hydrogen production and hydrogen-using devices throughout the plant, and analyzing their fuel gas and waste gas components, it was found that the waste gas discharged into the fuel gas pipeline network by many hydrogen-using devices has a very high hydrogen content, which not only causes a waste of hydrogen resources, but also has a low calorific value when used directly as fuel, affecting the efficiency of the heating furnace and increasing fuel gas consumption. Utility Model Content

[0003] The purpose of the utility model is to provide a hydrogen-containing waste gas purification treatment system to effectively solve the problems existing in the above-mentioned technology.

[0004] The utility model is achieved in this way:

[0005] A hydrogen-containing waste gas purification treatment system, comprising a reforming and decomposing gas pipeline, a water cooler, a buffer tank, a raw gas compressor, a first cooler, a first liquid separator tank, a second cooler, a second liquid separator tank, a raw material pretreatment tank and a hydrogen production and purification system, wherein the reforming and decomposing gas pipeline is connected to the water cooler, the water cooler is connected to the buffer tank through the raw gas pipeline, the raw gas compressor comprises a primary compressor and a secondary compressor, the buffer tank is connected to the primary compressor inlet through the buffer tank outlet pipeline, the primary compressor outlet is connected to the first cooler through the primary outlet line, the first A cooler is connected to the first liquid separator tank through a first liquid separator tank feed pipeline, the first liquid separator tank is connected to the inlet of the second compressor through a second feed pipeline, the outlet of the second compressor is connected to the second cooler through a second outlet pipeline, the second cooler is connected to the second liquid separator tank through a second liquid separator tank feed pipeline, the second liquid separator tank is connected to the raw material pretreatment tank through a compressed gas pipeline, the raw material pretreatment tank is connected to the hydrogen production and purification system through a PSA system feed pipeline, and the hydrogen production and purification system is connected to the hydrogen pipeline network and the fuel gas pipeline network in two ways.

[0006] In one embodiment of the utility model, the feed pipeline of the first-stage liquid separation tank is connected in series with the refined low-gas pipeline.

[0007] In one embodiment of the utility model, the secondary liquid separation tank feed pipeline is connected in series with the reformed low-gas pipeline.

[0008] In one embodiment of the utility model, the raw gas pipeline is connected to the secondary feed pipeline via a primary gas return pipeline, and the primary liquid separator tank feed pipeline and the compressed gas pipeline are connected via a secondary gas return pipeline.

[0009] In one embodiment of the utility model, the hydrogen purification system includes VPSA, PSA, a vacuum pump and a desorption gas compressor, the PSA system feed pipeline is connected to the VPSA, the VPSA and the PSA are connected through the PSA feed pipeline, the PSA is connected to the hydrogen pipeline network through a hydrogen pipeline, the VPSA is connected to the vacuum pump through a vacuum pump pipeline, the vacuum pump is connected to the desorption gas compressor through a vacuum pump outlet pipeline, the desorption gas compressor is connected to the fuel gas pipeline network through a fuel gas pipeline, and the PSA is connected to the desorption gas compressor through a PSA exhaust pipeline.

[0010] In one embodiment of the present invention, the PSA system feed pipeline is connected in series with the methanol-to-hydrogen reaction system.

[0011] Compared with the prior art, the beneficial effects of the utility model are:

[0012] Through hydrogen network system analysis and integrated optimization, this system recovers the hydrogen-containing waste gas from the reforming unit, diesel hydrotreating unit, and diesel hydrotreating unit through pressurization by the raw gas compressor and then sends it to the VPSA and PSA units to recover the hydrogen therein, thereby achieving efficient hydrogen production, reasonable hydrogen use, and sufficient recovery, solving the problems of unreasonable hydrogen utilization and insufficient recovery, reducing hydrogen costs, saving fuel gas, and improving the economic benefits of the entire plant. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] In order to more clearly illustrate the technical solution of the implementation mode of the utility model, the drawings required for use in the implementation mode will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the utility model and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying creative work.

[0014] Figure 1 It is a schematic diagram of the overall structure of the utility model.

[0015] Explanation of the reference numerals: 1. reforming and analyzing gas pipeline; 2. water cooler; 3. raw gas pipeline; 4. buffer tank; 5. buffer tank outlet pipeline; 6. raw gas compressor; 7. primary outlet line; 8. first cooler; 9. refined low-fraction gas pipeline; 10. primary liquid separator tank feed pipeline; 11. first liquid separator tank; 12. primary gas phase return pipeline; 13. secondary feed pipeline; 14. secondary outlet pipeline; 15. second cooler; 16. reforming low-fraction gas pipeline; 17. secondary separator Liquid tank feed pipeline; 18. Second liquid separation tank; 19. Secondary gas phase return pipeline; 20. Compressed gas pipeline; 21. Raw material pretreatment tank; 22. PSA system feed pipeline; 23. Methanol hydrogen production reaction system; 24. VPSA; 25. PSA feed pipeline; 26. PSA; 27. Hydrogen pipeline; 28. Vacuum pump pipeline; 29. ​​Vacuum pump; 30. Vacuum pump outlet pipeline; 31. PSA exhaust gas pipeline; 32. Analysis gas compressor; 33. Fuel gas pipeline. DETAILED DESCRIPTION

[0016] In order to make the purpose, technical solution and advantages of the implementation of the utility model clearer, the technical solution in the implementation of the utility model will be clearly and completely described below in conjunction with the drawings in the implementation of the utility model. Obviously, the described implementation is a part of the implementation of the utility model, not all of the implementations. Based on the implementation of the utility model, all other implementations obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0017] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present invention.

[0018] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0019] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0020] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0021] Example

[0022] Refer to the attached Figure 1 As shown, the utility model provides a hydrogen-containing waste gas purification treatment system, including a reforming and analyzing gas pipeline 1, a water cooler 2, a buffer tank 4, a raw gas compressor 6, a first cooler 8, a first liquid separator 11, a second cooler 15, a second liquid separator 18, a raw material pretreatment tank 21 and a hydrogen production purification system, the reforming and analyzing gas pipeline 1 is connected to the water cooler 2, the water cooler 2 is connected to the buffer tank 4 through the raw gas pipeline 3, the raw gas compressor 6 includes a primary compressor and a secondary compressor, the buffer tank 4 is connected to the primary compressor inlet through the buffer tank outlet pipeline 5, and the primary compressor outlet is connected to the first cooler 8 through the primary outlet line 7. The first cooler 8 is connected with the first liquid separator 11 through the first liquid separator feed pipeline 10, the first liquid separator 11 is connected with the second compressor inlet through the second feed pipeline 13, the second compressor outlet is connected with the second cooler 15 through the second outlet pipeline 14, the second cooler 15 is connected with the second liquid separator 18 through the second liquid separator feed pipeline 17, the second liquid separator 18 is connected with the raw material pretreatment tank 21 through the compressed gas pipeline 20, the raw material pretreatment tank 21 is connected to the hydrogen production and purification system through the PSA system feed pipeline 22, and the hydrogen production and purification system is connected to the hydrogen pipeline network and the fuel gas pipeline network in two ways.

[0023] In one embodiment of the present utility model, further, the first-stage liquid separation tank feed pipeline 10 is connected in series with the refined low-gas pipeline 9 .

[0024] In an embodiment of the present invention, further, the secondary liquid separation tank feed pipeline 17 is connected in series with the reformed low-gas pipeline 16 .

[0025] In one embodiment of the utility model, further, the raw gas pipeline 3 and the secondary feed pipeline 13 are connected through the primary gas return pipeline 12, and the primary liquid separator feed pipeline 10 and the compressed gas pipeline 20 are connected through the secondary gas return pipeline 19.

[0026] In one embodiment of the utility model, further, the hydrogen purification system includes VPSA24, PSA26, a vacuum pump 29 and a desorption gas compressor 32, the PSA system feed pipeline 22 is connected to VPSA24, VPSA24 and PSA26 are connected through the PSA feed pipeline 25, PSA26 is connected to the hydrogen pipeline network through the hydrogen pipeline 27, VPSA24 is connected to the vacuum pump 29 through the vacuum pump pipeline 28, the vacuum pump 29 is connected to the desorption gas compressor 32 through the vacuum pump outlet pipeline 30, the desorption gas compressor 32 is connected to the fuel gas pipeline network through the fuel gas pipeline 33, and PSA26 is connected to the desorption gas compressor 32 through the PSA exhaust pipeline 31.

[0027] In one embodiment of the present invention, further, the PSA system feed pipeline 22 is connected in series with the methanol-to-hydrogen reaction system 23 .

[0028] Specifically, the analytical gas comes from the reforming device, is cooled and reformed by the water cooler 2, and then is sent to the raw gas buffer tank 4 through the raw gas pipeline 3. After the condensate in the raw gas is separated by the buffer tank 4, the raw gas is sent to the raw gas compressor 6 through the buffer tank outlet pipeline 5 to compress the raw gas. After being compressed by the first-stage compressor, it is sent to the first cooler 8 through the first-stage outlet line 7 for cooling, and the first-stage compressed raw gas is sent to the first liquid separator 11. At the same time, the low-fraction gas comes from the diesel hydrofining device through the refined low-fraction gas pipeline 9 in series with the first-stage liquid separator feed pipeline 10. The first-stage compressor The compressed raw gas is sent to the secondary compressor for secondary pressurization, and the secondary compressed raw gas is sent to the second cooler 15 to cool the secondary compressed raw gas; the secondary compressed raw gas is sent to the second liquid separator 18 through the secondary liquid separator feed pipeline 17, and at the same time, the low-fraction gas comes from the diesel hydrogenation reforming device, and is connected in series with the secondary liquid separator feed pipeline 17 through the reforming low-fraction gas pipeline 16. After the second liquid separator 18 separates the condensate in the secondary compressed raw gas, the compressed raw gas is pre-treated in the pretreatment tank through the compressed gas pipeline 20, and then the raw gas enters the hydrogen production and purification system through the PSA system feed pipeline 22;

[0029] After the pipeline of the methanol hydrogen production reaction system 23 is connected in series with the PSA system feed pipeline 22, the raw gas is decarbonized by VPSA 24 and then enters PSA 26 through PSA feed pipeline 25. After the hydrogen purity is improved by PSA 26, it enters the hydrogen network through hydrogen pipeline 27;

[0030] The non-condensable gas in VPSA24 is extracted by vacuum pump 29 while maintaining negative pressure of VPSA. The non-condensable gas enters into desorption gas compressor 32 through vacuum pump outlet pipeline 30 for pressurization and enters into fuel gas network through fuel gas pipeline 33 as fuel gas.

[0031] This system reuses methanol hydrogen production units VPSA24 and PSA26. Due to the different pressures of hydrogen-containing waste gas discharged from different locations, it is necessary to add a new raw gas compressor to collect the hydrogen-containing waste gas discharged from each unit, and enter the first and second compressors of the raw gas compressor 6 according to different pressure levels. After being pressurized and recovered by the compressor, the feed pressure of VPSA24 and PSA26 is met. After pressurization, the hydrogen-containing waste gas enters VPSA24 and PSA26 for purification. After being treated by VPSA24 and PSA26, the purity of hydrogen can reach 99.9%, meeting the hydrogen pipeline demand of the entire plant. After the waste gas separates the hydrogen, it enters the analytical gas compressor for pressurization and enters the fuel gas pipeline network.

[0032] Through hydrogen network system analysis and integrated optimization, this system recovers the hydrogen-containing waste gas from the reforming unit, diesel hydrotreating unit, and diesel hydrotreating unit through pressurization by the raw gas compressor and then sends it to VPSA24 and PSA26 to recover the hydrogen therein, achieving efficient hydrogen production, reasonable hydrogen use, and sufficient recovery, solving the problems of unreasonable hydrogen utilization and insufficient recovery, reducing hydrogen costs, saving fuel gas, and improving the economic benefits of the entire plant.

[0033] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may be modified and varied in various ways. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A hydrogen-containing waste gas purification treatment system, characterized in that: The invention comprises a reforming and decomposing gas pipeline (1), a water cooler (2), a buffer tank (4), a raw gas compressor (6), a first cooler (8), a first liquid separator tank (11), a second cooler (15), a second liquid separator tank (18), a raw material pretreatment tank (21) and a hydrogen production and purification system, wherein the reforming and decomposing gas pipeline (1) is connected to the water cooler (2), the water cooler (2) is connected to the buffer tank (4) through the raw gas pipeline (3), the raw gas compressor (6) comprises a primary compressor and a secondary compressor, the buffer tank (4) is connected to the inlet of the primary compressor through the buffer tank outlet pipeline (5), the outlet of the primary compressor is connected to the first cooler (8) through the primary outlet line (7), and the first cooler (8) is connected to the first compressor via the first outlet line (7). ) is connected to the first liquid separator tank (11) through a first liquid separator tank feed pipeline (10), the first liquid separator tank (11) is connected to the inlet of the second compressor through a second feed pipeline (13), the outlet of the second compressor is connected to the second cooler (15) through a second outlet pipeline (14), the second cooler (15) is connected to the second liquid separator tank (18) through a second liquid separator tank feed pipeline (17), the second liquid separator tank (18) is connected to the raw material pretreatment tank (21) through a compressed gas pipeline (20), the raw material pretreatment tank (21) is connected to the hydrogen production and purification system through a PSA system feed pipeline (22), and the hydrogen production and purification system is connected to the hydrogen pipeline network and the fuel gas pipeline network in two ways.

2. A hydrogen-containing waste gas purification treatment system according to claim 1, characterized in that: The first-stage liquid separation tank feed pipeline (10) is connected in series with the refined low-gas pipeline (9).

3. A hydrogen-containing waste gas purification treatment system according to claim 1, characterized in that: The secondary liquid separation tank feed pipeline (17) is connected in series with the reformed low-gas pipeline (16).

4. A hydrogen-containing waste gas purification treatment system according to claim 1, characterized in that: The raw gas pipeline (3) is connected to the secondary feed pipeline (13) via a primary gas phase return pipeline (12), and the primary liquid separation tank feed pipeline (10) is connected to the compressed gas pipeline (20) via a secondary gas phase return pipeline (19).

5. A hydrogen-containing waste gas purification treatment system according to claim 1, characterized in that: The hydrogen purification system comprises a VPSA (24), a PSA (26), a vacuum pump (29) and a desorption gas compressor (32); the PSA system feed pipeline (22) is connected to the VPSA (24); the VPSA (24) and the PSA (26) are connected via a PSA feed pipeline (25); the PSA (26) is connected to the hydrogen pipeline network via a hydrogen pipeline (27); the VPSA (24) is connected to the vacuum pump (29) via a vacuum pump pipeline (28); the vacuum pump (29) is connected to the desorption gas compressor (32) via a vacuum pump outlet pipeline (30); the desorption gas compressor (32) is connected to the fuel gas pipeline network via a fuel gas pipeline (33); the PSA (26) is connected to the desorption gas compressor (32) via a PSA exhaust pipeline (31).

6. A hydrogen-containing waste gas purification treatment system according to claim 5, characterized in that: The PSA system feed pipeline (22) is connected in series with the methanol-to-hydrogen reaction system (23).

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