Hydrogen wet compression system

Abstract

The present disclosure relates to a wet compression system of hydrogen, the wet compression system comprising: a hydrogen tank car (1); a liquid hydrogen storage tank (2); the at least one-stage compressor comprises a first-stage compressor (31); and a communication structure; comprising a first pipeline (41) and a second pipeline (42), and the first pipeline (41) is communicated with the hydrogen tank car (1) and used for injecting hydrogen into the first-stage compressor (31); the second pipeline (42) comprises a main pipeline (421) and a first branch pipeline (422) communicated with the downstream of the main pipeline (421), the main pipeline (421) is communicated with the liquid hydrogen storage tank (2), and the first branch pipeline (422) is used for injecting liquid hydrogen into the first-stage compressor (31). The wet compression system is simple in structure, and other impurities cannot be introduced while the exhaust temperature of the compressor is reduced.

Description

Technical Field

[0001] The present disclosure relates to the field of hydrogen technology, and in particular, to a hydrogen wet compression system. Background Art

[0002] In the related technology, the hydrogen in the hydrogen tank truck generally needs to be compressed by a compressor and then stored in a gas tank. At present, the high exhaust temperature of the compressor is an important reason that restricts the exhaust pressure from being further increased. In order to reduce the exhaust temperature, an external chiller and interstage heat exchanger are generally required, which makes the structure of the entire system more complicated. Summary of the invention

[0003] An object of the present disclosure is to provide a hydrogen wet compression system, which has a simple structure and does not introduce other impurities while achieving the goal of reducing the exhaust temperature of the compressor.

[0004] In order to achieve the above object, the present disclosure provides a wet compression system for hydrogen, the wet compression system comprising:

[0005] Hydrogen tank truck;

[0006] Liquid hydrogen storage tanks;

[0007] at least one compressor, including a first compressor; and

[0008] A connecting structure; comprising a first pipeline and a second pipeline, wherein the first pipeline is connected to the hydrogen tank truck and is used to inject hydrogen into the first-stage compressor; the second pipeline comprises a main pipeline and a first branch pipeline connected to the downstream of the main pipeline, wherein the main pipeline is connected to the liquid hydrogen storage tank, and the first branch pipeline is used to inject liquid hydrogen into the first-stage compressor.

[0009] Optionally, the connecting structure includes a first mixing element, the first pipeline is connected between the hydrogen tank truck and the first inlet of the first mixing element, the first branch is connected to the second inlet of the first mixing element, and the inlet of the first compressor is connected to the outlet of the first mixing element.

[0010] Optionally, an atomizer is provided on the main pipe.

[0011] Optionally, the communication structure further includes a third pipeline and a second mixing element, wherein the third pipeline is connected between the outlet of the first-stage compressor and the first inlet of the second mixing element;

[0012] The second pipeline further includes a second branch pipeline connected to the downstream of the main pipeline, and the second branch pipeline is connected to the second inlet of the second mixing element;

[0013] The at least one compressor further comprises a secondary compressor, wherein an inlet of the secondary compressor is communicated with an outlet of the second mixing element.

[0014] Optionally, both the primary compressor and the secondary compressor are configured as diaphragm compressors.

[0015] Optionally, the first mixing element and the second mixing element are both configured as three-way pipes.

[0016] Optionally, the wet compression system includes a controller and a first flow regulating valve and a first temperature sensor electrically connected to the controller, the first flow regulating valve is arranged on the first branch road, the first temperature sensor is arranged at the outlet of the first-stage compressor, and the controller is used to control the opening of the first flow regulating valve according to the first temperature sensor.

[0017] Optionally, the flow rate of the first flow regulating valve is 8.0 kg / h to 10.0 kg / h.

[0018] Optionally, the wet compression system includes a controller and a second flow regulating valve and a second temperature sensor electrically connected to the controller, the second flow regulating valve is arranged on the second branch line, the second temperature sensor is arranged at the outlet of the secondary compressor, and the controller is used to control the opening of the second flow regulating valve according to the second temperature sensor.

[0019] Optionally, the flow rate of the second flow regulating valve is 7.0 kg / h to 8.0 kg / h.

[0020] Through the above technical scheme, in the wet compression system of hydrogen provided by the present disclosure, when the wet compression system is working, the hydrogen in the hydrogen tank truck can be injected into the first-stage compressor through the first pipeline, and the liquid hydrogen in the liquid hydrogen storage tank can be injected into the first-stage compressor through the first branch road, so that when the first-stage compressor compresses the hydrogen, the high-temperature gas in the first-stage compressor can be fully cooled by utilizing the gasification heat absorption of liquid hydrogen, thereby effectively reducing the exhaust temperature and facilitating isothermal compression. Here, the introduction of liquid hydrogen will not add new impurities to the wet compression system, and by utilizing the gasification heat absorption of liquid hydrogen, the wet compression system disclosed in the present disclosure can omit structures such as an external chiller and an interstage heat exchanger, so the structure of the wet compression system disclosed in the present disclosure is simple, and other impurities will not be introduced while reducing the exhaust temperature of the compressor. In addition, after the liquid hydrogen injected into the first-stage compressor is gasified, it can also increase the displacement and exhaust pressure of the first-stage compressor. In addition, the reduction in exhaust temperature can also significantly reduce the high-temperature damage of seals such as valve seals and cylinder seals in the first-stage compressor, thereby improving the operating reliability of the first-stage compressor.

[0021] Other features and advantages of the present disclosure will be described in detail in the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The accompanying drawings are used to provide a further understanding of the present disclosure and constitute a part of the specification. Together with the following specific embodiments, they are used to explain the present disclosure but do not constitute a limitation of the present disclosure. In the accompanying drawings:

[0023] Figure 1 is a structural schematic diagram of a hydrogen wet compression system provided according to an embodiment of the present disclosure;

[0024] Figure 2 is a first experimental diagram when liquid hydrogen is added to a first-stage compressor according to an embodiment of the present disclosure;

[0025] Figure 3 This is a second experimental diagram when the secondary compressor is filled with liquid hydrogen according to an embodiment of the present disclosure.

[0026] Description of Reference Numerals

[0027] 1-hydrogen tank truck, 2-liquid hydrogen storage tank, 31-first compressor, 32-second compressor, 41-first pipeline, 42-second pipeline, 421-main pipeline, 422-first branch road, 423-second branch road, 43-first mixing element, 44-third pipeline, 45-second mixing element, 5-atomizer, 61-first flow regulating valve, 62-second flow regulating valve, 63-third flow regulating valve, 64-fourth flow regulating valve, 71-first temperature sensor, 72-second temperature sensor, 8-hydrogen storage tank, 9-pumping device. DETAILED DESCRIPTION

[0028] The specific implementation of the present disclosure is described in detail below in conjunction with the accompanying drawings. It should be understood that the specific implementation described herein is only used to illustrate and explain the present disclosure, and is not used to limit the present disclosure.

[0029] In this disclosure, unless otherwise stated, directional words such as "inside" and "outside" refer to the inside and outside of the contour of each component itself. "Upstream" and "downstream" are defined based on the flow direction of the fluid. The terms "first" and "second" are used to distinguish one element from another element and do not have order or importance.

[0030] According to an exemplary embodiment of the present disclosure, a wet compression system for hydrogen is provided, referring to Figure 1As shown in the figure, the wet compression system includes: a hydrogen tank truck 1; a liquid hydrogen storage tank 2; at least one stage compressor, including a stage compressor 31; and a connecting structure; including a first pipeline 41 and a second pipeline 42, the first pipeline 41 is connected to the hydrogen tank truck 1, and is used to inject hydrogen into the stage compressor 31; the second pipeline 42 includes a main pipeline 421 and a first branch pipeline 422 connected to the downstream of the main pipeline 421, the main pipeline 421 is connected to the liquid hydrogen storage tank 2, and the first branch pipeline 422 is used to inject liquid hydrogen into the stage compressor 31.

[0031] Through the above technical scheme, in the wet compression system of hydrogen provided by the present invention, when the wet compression system is working, the hydrogen in the hydrogen tank truck 1 can be injected into the first-stage compressor 31 through the first pipeline 41, and the liquid hydrogen in the liquid hydrogen storage tank 2 can be injected into the first-stage compressor 31 through the first branch 422. In this way, when the first-stage compressor 31 compresses hydrogen, the high-temperature gas in the first-stage compressor 31 can be fully cooled by utilizing the vaporization heat absorption of liquid hydrogen, thereby effectively reducing the exhaust temperature and facilitating isothermal compression. Here, the introduction of liquid hydrogen will not add new impurities to the wet compression system, and by utilizing the vaporization heat absorption of liquid hydrogen, the wet compression system of the present invention can omit structures such as an external chiller and an interstage heat exchanger. Therefore, the wet compression system of the present invention has a simple structure and does not introduce other impurities while reducing the exhaust temperature of the compressor. In addition, after the liquid hydrogen injected into the first-stage compressor 31 is vaporized, it can also increase the displacement and exhaust pressure of the first-stage compressor 31. In addition, the reduction in exhaust temperature can also significantly reduce high-temperature damage to seals such as valve seals and cylinder seals in the first-stage compressor 31 , thereby improving the operating reliability of the first-stage compressor 31 .

[0032] It should be noted that the “hydrogen” in the present disclosure refers to gaseous hydrogen, which will not be elaborated in the present disclosure.

[0033] In the exemplary embodiment of the present disclosure, referring to Figure 1 As shown in , the communication structure may include a first mixer 43, a first pipeline 41 is connected between the hydrogen tanker 1 and the first inlet of the first mixer 43, a first branch 422 is connected to the second inlet of the first mixer 43, and the inlet of the first compressor 31 is connected to the outlet of the first mixer 43. In this way, the hydrogen in the first pipeline 41 and the liquid hydrogen in the first branch 422 can be mixed in the first mixer 43 and then injected into the first compressor 31, which is conducive to improving the cooling effect of the hydrogen when the liquid hydrogen is gasified.

[0034] In the exemplary embodiment of the present disclosure, referring to Figure 1As shown in , an atomizer 5 can be provided on the main line 421. Here, the atomizer 5 can convert liquid hydrogen into small particle droplets. In this way, on the one hand, it is conducive to the full mixing of the hydrogen in the first pipeline 41 and the liquid hydrogen in the first branch line 422. On the other hand, it can also improve the heat transfer efficiency when the liquid hydrogen phase changes, that is, when the liquid hydrogen is gasified. In addition, when the first-stage compressor 31 is a diaphragm compressor, the setting of the atomizer 5 can also avoid the impact of large particle droplets on the diaphragm and the membrane cavity, thereby improving the service life of the first-stage compressor 31. Here, the atomizer 5 can be constructed as an ultrasonic atomizer, which is not limited in the present disclosure.

[0035] In some embodiments of the present disclosure, reference Figure 1 As shown in , the connecting structure may also include a third pipeline 44 and a second mixing element 45, the third pipeline 44 is connected between the outlet of the first compressor 31 and the first inlet of the second mixing element 45; the second pipeline 42 also includes a second branch 423 connected to the downstream of the main pipeline 421, and the second branch 423 is connected to the second inlet of the second mixing element 45; at least one compressor also includes a secondary compressor 32, and the inlet of the secondary compressor 32 is connected to the outlet of the second mixing element 45. In this way, the two-stage compression of hydrogen can be achieved by using the first compressor 31 and the second compressor 32, wherein the hydrogen discharged from the first compressor 31 can be mixed with the liquid hydrogen in the second branch 423 and then injected into the second compressor 32, so that the exhaust temperature of the second compressor 32 can be effectively reduced. In addition, when the second compressor 32 is a diaphragm compressor, the above-mentioned atomizer 5 can also avoid the impact of large particle droplets on the diaphragm and the membrane cavity, thereby improving the service life of the second compressor 32.

[0036] It should be noted that in the wet compression system of the present invention, three or more stages of compressors can be set according to actual needs. In this case, the second pipeline 42 includes branch pipelines corresponding to each stage of the compressor, so as to inject liquid hydrogen into the corresponding compressor of each stage.

[0037] In some embodiments of the present disclosure, the first mixing element 43 and the second mixing element 45 can be configured as a tee. Of course, in other embodiments, the first mixing element 43 and the second mixing element 45 can also be configured as a mixing valve, which is not limited by the present disclosure.

[0038] In the exemplary embodiment of the present disclosure, referring to Figure 1As shown in , the wet compression system includes a controller and a first flow regulating valve 61 and a first temperature sensor 71 electrically connected to the controller. The first flow regulating valve 61 is arranged on the first branch 422, and the first temperature sensor 71 is arranged at the outlet of the first-stage compressor 31. The controller is used to control the opening of the first flow regulating valve 61 according to the first temperature sensor 71. In this way, the controller can flexibly adjust the opening of the first flow regulating valve 61 according to the first temperature sensor 71, that is, flexibly adjust the liquid hydrogen injection amount in the first-stage compressor 31, and realize automatic control of the liquid hydrogen injection amount in the first-stage compressor 31.

[0039] In some embodiments of the present disclosure, reference Figure 2 As shown in , the flow rate of the first flow regulating valve 61 can be 8.0kg / h to 10.0kg / h. Here, the flow rate of the first flow regulating valve 61 can be understood as the flow rate of liquid hydrogen injected into the first compressor 31 through the first branch 422. Figure 2 This is the first experimental diagram when the first stage compressor 31 is filled with liquid hydrogen. Here, the hydrogen temperature in the hydrogen tanker 1 is set to 20°C, the exhaust pressure of the first stage compressor 31 is 40Mpa, and the hydrogen injected into the first stage compressor 31 is 200 standard cubic meters / hour, that is, 17.8kg / h. Figure 2 It can be seen that with the increase of the flow rate of the first flow regulating valve 61, the exhaust temperature of the first-stage compressor 31 is significantly reduced. When the flow rate is 8.0kg / h~10.0kg / h, the exhaust temperature of the first-stage compressor 31 is about 20°C. When the flow rate is 8.9kg / h, the exhaust temperature is reduced to 20°C. Therefore, by setting the flow rate of the first flow regulating valve 61 to 8.9kg / h, isothermal compression of the first-stage compressor 31 can be achieved, and the displacement of the first-stage compressor 31 can be effectively increased.

[0040] In some embodiments of the present disclosure, reference Figure 1 As shown in , the wet compression system may include a controller and a second flow regulating valve 62 and a second temperature sensor 72 electrically connected to the controller, the second flow regulating valve 62 being arranged on the second branch 423, the second temperature sensor 72 being arranged at the outlet of the secondary compressor 32, and the controller being used to control the opening of the second flow regulating valve 62 according to the second temperature sensor 72. Similarly, the controller may flexibly adjust the opening of the second flow regulating valve 62 according to the second temperature sensor 72, that is, flexibly adjust the amount of liquid hydrogen injected into the secondary compressor 32, and realize automatic control of the amount of liquid hydrogen injected into the secondary compressor 32.

[0041] In some embodiments of the present disclosure, reference Figure 3As shown in , the flow rate of the second flow regulating valve 62 is 7.0kg / h to 8.0kg / h. Here, the flow rate of the second flow regulating valve 62 can be understood as the flow rate of liquid hydrogen injected into the secondary compressor 32 through the second branch. Figure 3 This is the first experimental diagram when the secondary compressor 32 is filled with liquid hydrogen. Here, the exhaust temperature of the primary compressor 31 is set to 20°C, the exhaust pressure of the secondary compressor 32 is set to 90Mpa, and the hydrogen injected into the secondary compressor 32 is 200 standard cubic meters / hour, that is, 17.8kg / h. Figure 3 It can be seen that with the increase of the flow rate of the second flow regulating valve 62, the exhaust temperature of the secondary compressor 32 is significantly reduced. When the flow rate is 7.0kg / h~8.0kg / h, the exhaust temperature of the secondary compressor 32 is about 20°C. When the flow rate is 7.7kg / h, the exhaust temperature is reduced to 20°C. Therefore, by setting the flow rate of the second flow regulating valve 62 to 7.7kg / h, isothermal compression of the secondary compressor 32 can be achieved, and the displacement of the secondary compressor can be effectively increased.

[0042] In some embodiments of the present disclosure, reference Figure 1 As shown in , the main pipeline 421 may be provided with a third flow regulating valve 63, and the first pipeline 41 may be provided with a fourth flow regulating valve 64, which is not limited in the present disclosure. In addition, a pumping device 9 may be provided on the main pipeline 421 to achieve the delivery of liquid hydrogen. In addition, in the embodiment where the wet compression system includes a two-stage compressor, the outlet of the secondary compressor 32 may be connected to the hydrogen storage tank 8.

[0043] Next, the present disclosure will provide a detailed introduction to the specific working process of the wet compression system in combination with the above specific implementations. Figure 1As shown in the figure, first, the gaseous hydrogen in the hydrogen tank truck 1 flows into the first mixing element 43 through the first pipeline 41, and the liquid hydrogen in the liquid hydrogen storage tank 2 flows to the atomizer 5 through the pumping device 9. Under the action of ultrasonic waves, the liquid hydrogen is atomized into tiny droplets and flows into the first mixing element 43 through the first branch 422. At this time, the gaseous hydrogen and the atomized liquid hydrogen are mixed in the first mixing element 43 and enter the first-stage compressor 31. In the membrane cavity of the first-stage compressor 31, a large amount of heat will be generated during the gas compression process. Therefore, the gas temperature in the membrane cavity will rise rapidly. After adding liquid hydrogen, the high temperature environment in the membrane cavity of the first-stage compressor will cause the liquid hydrogen to undergo a phase change. In the process of converting the liquid state to the gas state, a large amount of heat will be absorbed. Therefore, the gas temperature in the membrane cavity can be rapidly reduced, thereby effectively reducing the exhaust temperature of the first-stage compressor 31, which is beneficial to increasing the exhaust pressure of the first-stage compressor 31. Afterwards, the hydrogen discharged from the first-stage compressor 31 is mixed with the atomized liquid hydrogen in the second branch 423 in the second mixing element 45, and then enters the second-stage compressor 32. The gasification of the liquid hydrogen can reduce the gas temperature in the membrane cavity of the second-stage compressor 32, thereby reducing the exhaust temperature of the second-stage compressor 32, which is beneficial to increasing the exhaust pressure of the second-stage compressor 32.

[0044] The preferred embodiments of the present disclosure are described in detail above in conjunction with the accompanying drawings; however, the present disclosure is not limited to the specific details in the above embodiments. Within the technical concept of the present disclosure, a variety of simple modifications can be made to the technical solution of the present disclosure, and these simple modifications all fall within the protection scope of the present disclosure.

[0045] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, the present disclosure will not further describe various possible combinations.

[0046] In addition, various embodiments of the present disclosure may be arbitrarily combined, and as long as they do not violate the concept of the present disclosure, they should also be regarded as the contents disclosed by the present disclosure.

Claims

1. A hydrogen wet compression system, characterized in that: The wet compression system comprises: Hydrogen tank truck; Liquid hydrogen storage tanks; at least one compressor, including a first compressor; and A connecting structure; comprising a first pipeline and a second pipeline, wherein the first pipeline is connected to the hydrogen tank truck and is used to inject hydrogen into the first-stage compressor; the second pipeline comprises a main pipeline and a first branch pipeline connected to the downstream of the main pipeline, wherein the main pipeline is connected to the liquid hydrogen storage tank, and the first branch pipeline is used to inject liquid hydrogen into the first-stage compressor.

2. The wet compression system of hydrogen according to claim 1, characterized in that: The connecting structure includes a first mixing element, the first pipeline is connected between the hydrogen tank truck and the first inlet of the first mixing element, the first branch is connected to the second inlet of the first mixing element, and the inlet of the first compressor is connected to the outlet of the first mixing element.

3. The wet compression system of hydrogen according to claim 1 or 2, characterized in that: The main pipe is provided with an atomizer.

4. The wet compression system of hydrogen according to claim 3, characterized in that: The communication structure further includes a third pipeline and a second mixing element, wherein the third pipeline is connected between the outlet of the first-stage compressor and the first inlet of the second mixing element; The second pipeline further includes a second branch pipeline connected to the downstream of the main pipeline, and the second branch pipeline is connected to the second inlet of the second mixing element; The at least one compressor further comprises a secondary compressor, wherein an inlet of the secondary compressor is communicated with an outlet of the second mixing element.

5. The wet compression system of hydrogen according to claim 4, characterized in that: The primary compressor and the secondary compressor are both configured as diaphragm compressors.

6. The hydrogen wet compression system according to claim 4, characterized in that: The first mixing element and the second mixing element are both configured as tee pipes.

7. The hydrogen wet compression system according to claim 1, characterized in that: The wet compression system includes a controller and a first flow regulating valve and a first temperature sensor electrically connected to the controller. The first flow regulating valve is arranged on the first branch road, and the first temperature sensor is arranged at the outlet of the first-stage compressor. The controller is used to control the opening of the first flow regulating valve according to the first temperature sensor.

8. The hydrogen wet compression system according to claim 7, characterized in that: The flow rate of the first flow regulating valve is 8.0 kg / h to 10.0 kg / h.

9. The hydrogen wet compression system according to claim 4, characterized in that: The wet compression system includes a controller and a second flow regulating valve and a second temperature sensor electrically connected to the controller, the second flow regulating valve is arranged on the second branch line, the second temperature sensor is arranged at the outlet of the secondary compressor, and the controller is used to control the opening of the second flow regulating valve according to the second temperature sensor.

10. The hydrogen wet compression system according to claim 9, characterized in that: The flow rate of the second flow regulating valve is 7.0kg / h to 8.0kg / h.

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