Hydrogen wet compression system

Abstract

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

Description

Technical Field

[0001] This disclosure relates to the field of hydrogen technology, and more specifically, to a wet compression system for hydrogen. Background Technology

[0002] In related technologies, hydrogen in hydrogen tank trucks typically needs to be compressed by a compressor before being stored in a storage tank. Currently, the excessively high exhaust temperature of the compressor is a major reason why the exhaust pressure cannot be further increased. To reduce the exhaust temperature, an external chiller and an interstage heat exchanger are generally required, which makes the entire system structure quite complex. Summary of the Invention

[0003] The purpose of this disclosure is to provide a wet compression system for hydrogen that has a simple structure and achieves a reduction in compressor exhaust temperature without introducing other impurities.

[0004] To achieve the above objectives, this disclosure provides a wet compression system for hydrogen, the wet compression system comprising:

[0005] Hydrogen tanker truck;

[0006] Liquid hydrogen storage tank;

[0007] At least one stage compressor, including a single stage compressor; and

[0008] The connection structure includes a first pipeline and a second pipeline. The first pipeline is connected to the hydrogen tanker and is used to inject hydrogen into the first-stage compressor. The second pipeline includes a main pipeline and a first branch pipeline connected downstream of the main pipeline. 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 connection structure includes a first mixing element, the first pipeline connecting the hydrogen tanker and the first inlet of the first mixing element, the first branch line connecting to the second inlet of the first mixing element, and the inlet of the first-stage compressor connecting to the outlet of the first mixing element.

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

[0011] Optionally, the connection structure further includes a third pipeline and a second mixing component, the third pipeline being connected between the outlet of the first-stage compressor and the first inlet of the second mixing component;

[0012] The second pipeline also includes a second branch line connected downstream of the main pipeline, the second branch line being connected to a second inlet of the second mixing component;

[0013] The primary compressor also includes a secondary compressor, the inlet of which is connected to the outlet of the second mixing unit.

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

[0015] Optionally, both the first and second hybrid components are configured as tee 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 disposed on the first branch line, and the first temperature sensor is disposed at the outlet of the first stage compressor. The controller is used to control the opening degree 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 disposed on the second branch, and the second temperature sensor is disposed at the outlet of the secondary compressor. The controller is used to control the opening degree 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 solution, in the hydrogen wet compression system provided in this disclosure, during operation, hydrogen from the hydrogen tanker can be injected into the primary compressor via the first pipeline, and liquid hydrogen from the liquid hydrogen storage tank can be injected into the primary compressor via the first branch pipeline. Thus, when the primary compressor compresses the hydrogen, the heat absorption during vaporization of the liquid hydrogen effectively cools the high-temperature gas within the primary compressor, thereby effectively reducing the exhaust temperature and facilitating isothermal compression. The introduction of liquid hydrogen does not introduce new impurities into the wet compression system, and by utilizing the heat absorption during vaporization, the wet compression system of this disclosure eliminates the need for external chillers and interstage heat exchangers. Therefore, the structure of the wet compression system of this disclosure is simple, and it reduces the compressor exhaust temperature without introducing other impurities. Furthermore, the liquid hydrogen injected into the primary compressor, after vaporization, can increase the compressor's displacement and exhaust pressure. In addition, the reduction in exhaust temperature can significantly reduce high-temperature damage to seals such as valve seals and cylinder seals in the primary compressor, improving the operational reliability of the primary compressor.

[0021] Other features and advantages of this disclosure will be described in detail in the following detailed description section. Attached Figure Description

[0022] The accompanying drawings are provided to further illustrate the present disclosure and form part of the specification. They are used together with the following detailed description to explain the present disclosure, but do not constitute a limitation thereof. In the drawings:

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

[0024] Figure 2 This is a first experimental diagram of adding liquid hydrogen to a first-stage compressor according to an embodiment of this disclosure;

[0025] Figure 3 This is a second experimental diagram of adding liquid hydrogen to a secondary compressor according to an embodiment of this disclosure.

[0026] Explanation of reference numerals in the attached figures

[0027] 1-Hydrogen tanker, 2-Liquid hydrogen storage tank, 31-First stage compressor, 32-Second stage compressor, 41-First pipeline, 42-Second pipeline, 421-Main pipeline, 422-First branch pipeline, 423-Second branch pipeline, 43-First mixing unit, 44-Third pipeline, 45-Second mixing unit, 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 Implementation

[0028] The specific embodiments of this disclosure will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustration and explanation only and are not intended to limit this disclosure.

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

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

[0031] Through the above technical solution, in the hydrogen wet compression system provided in this disclosure, during operation, hydrogen from the hydrogen tanker 1 can be injected into the primary compressor 31 via the first pipeline 41, and liquid hydrogen from the liquid hydrogen storage tank 2 can be injected into the primary compressor 31 via the first branch pipeline 422. Thus, when the primary compressor 31 compresses the hydrogen, the heat absorption during vaporization of the liquid hydrogen effectively cools the high-temperature gas inside the primary compressor 31, thereby effectively reducing the exhaust temperature and facilitating isothermal compression. Here, the introduction of liquid hydrogen does not introduce new impurities into the wet compression system, and by utilizing the heat absorption during vaporization of liquid hydrogen, the wet compression system of this disclosure eliminates the need for external chillers and interstage heat exchangers. Therefore, the structure of the wet compression system of this disclosure is simple, and it reduces the compressor exhaust temperature without introducing other impurities. Furthermore, the liquid hydrogen injected into the primary compressor 31, after vaporization, can also increase the displacement and exhaust pressure of the primary compressor 31. In addition, the reduction in exhaust temperature can significantly reduce high-temperature damage to seals such as valve seals and cylinder seals in the first-stage compressor 31, thereby improving the operational reliability of the first-stage compressor 31.

[0032] It should be noted that "hydrogen" in this disclosure refers to gaseous hydrogen, which will not be elaborated upon further in this disclosure.

[0033] In an exemplary embodiment of this disclosure, reference is made to Figure 1 As shown, the connection structure may include a first mixing element 43, a first pipeline 41 connecting the hydrogen tanker 1 and the first inlet of the first mixing element 43, a first branch line 422 connecting the second inlet of the first mixing element 43, and the inlet of the first-stage compressor 31 connecting the outlet of the first mixing element 43. In this way, the hydrogen in the first pipeline 41 and the liquid hydrogen in the first branch line 422 can be mixed in the first mixing element 43 before being injected into the first-stage compressor 31, which helps to improve the cooling effect of the hydrogen during liquid hydrogen vaporization.

[0034] In an exemplary embodiment of this disclosure, reference is made to Figure 1As shown, an atomizer 5 can be installed on the main pipeline 421. Here, the atomizer 5 can convert liquid hydrogen into small droplets. This facilitates thorough mixing of the hydrogen in the first pipeline 41 and the liquid hydrogen in the first branch pipeline 422, and also improves the heat transfer efficiency during the liquid hydrogen phase change, i.e., during liquid hydrogen vaporization. Furthermore, in the embodiment where the primary compressor 31 is a diaphragm compressor, the atomizer 5 can prevent large droplets from impacting the diaphragm and membrane cavity, thus extending the service life of the primary compressor 31. Here, the atomizer 5 can be constructed as an ultrasonic atomizer; this disclosure does not limit its application to this.

[0035] In some embodiments of this disclosure, reference is made to Figure 1 As shown, the connecting structure may further include a third pipe 44 and a second mixing element 45. The third pipe 44 connects between the outlet of the first-stage compressor 31 and the first inlet of the second mixing element 45. The second pipe 42 also includes a second branch pipe 423 connected downstream of the main pipe 421, and the second branch pipe 423 is connected to the second inlet of the second mixing element 45. At least the first-stage compressor also includes a second-stage compressor 32, and the inlet of the second-stage compressor 32 is connected to the outlet of the second mixing element 45. In this way, two-stage compression of hydrogen can be achieved using the first-stage compressor 31 and the second-stage compressor 32. The hydrogen discharged from the first-stage compressor 31 can be mixed with the liquid hydrogen in the second branch pipe 423 before being injected into the second-stage compressor 32, which can effectively reduce the exhaust temperature of the second-stage compressor 32. In addition, when the second-stage compressor 32 is a diaphragm compressor, the atomizer 5 can also prevent large droplets from impacting the diaphragm and the diaphragm cavity, thereby improving the service life of the second-stage compressor 32.

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

[0037] In some embodiments of this disclosure, both the first mixing element 43 and the second mixing element 45 can be configured as a tee pipe. Of course, in other embodiments, the first mixing element 43 and the second mixing element 45 can also be configured as a mixing valve, and this disclosure does not limit this.

[0038] In an exemplary embodiment of this disclosure, reference is made to Figure 1As shown, 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 located on the first branch line 422, and the first temperature sensor 71 is located at the outlet of the first-stage compressor 31. The controller controls the opening degree of the first flow regulating valve 61 based on the first temperature sensor 71. In this way, the controller can flexibly adjust the opening degree 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, thereby realizing automatic control of the liquid hydrogen injection amount in the first-stage compressor 31.

[0039] In some embodiments of this disclosure, reference is made to Figure 2 As shown, the flow rate of the first flow regulating valve 61 can be 8.0 kg / h to 10.0 kg / 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-stage compressor 31 via the first branch line 422. Figure 2 This is the first experimental diagram showing the addition of liquid hydrogen to the first-stage compressor 31. Here, the hydrogen temperature in the hydrogen tanker 1 is set at 20℃, the exhaust pressure of the first-stage compressor 31 is 40 MPa, and the amount of hydrogen injected into the first-stage compressor 31 is 200 standard cubic meters per hour, or 17.8 kg / h. (Reference) Figure 2 It can be seen that as the flow rate of the first flow regulating valve 61 increases, the discharge temperature of the first-stage compressor 31 decreases significantly. When the flow rate is 8.0 kg / h to 10.0 kg / h, the discharge temperature of the first-stage compressor 31 is around 20°C. When the flow rate is 8.9 kg / h, the discharge temperature drops to 20°C. Therefore, by setting the flow rate of the first flow regulating valve 61 to 8.9 kg / 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 this disclosure, reference is made to Figure 1 As shown, 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 is located on the second branch 423, and the second temperature sensor 72 is located at the outlet of the secondary compressor 32. The controller controls the opening degree of the second flow regulating valve 62 based on the second temperature sensor 72. Similarly, the controller can flexibly adjust the opening degree of the second flow regulating valve 62 based on the second temperature sensor 72, that is, flexibly adjust the liquid hydrogen injection amount in the secondary compressor 32, thereby realizing automatic control of the liquid hydrogen injection amount in the secondary compressor 32.

[0041] In some embodiments of this disclosure, reference is made to Figure 3As shown, the flow rate of the second flow regulating valve 62 is 7.0 kg / h to 8.0 kg / 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 via the second branch. Figure 3 This is the first experimental diagram showing the addition of liquid hydrogen to the second-stage compressor 32. Here, the exhaust temperature of the first-stage compressor 31 is set to 20℃, the exhaust pressure of the second-stage compressor 32 is set to 90 MPa, and the amount of hydrogen injected into the second-stage compressor 32 is 200 Nm³ / h, or 17.8 kg / h. (Reference) Figure 3 It can be seen that as the flow rate of the second flow regulating valve 62 increases, the discharge temperature of the second-stage compressor 32 decreases significantly. When the flow rate is 7.0 kg / h to 8.0 kg / h, the discharge temperature of the second-stage compressor 32 is around 20°C. When the flow rate is 7.7 kg / h, the discharge temperature drops to 20°C. Therefore, by setting the flow rate of the second flow regulating valve 62 to 7.7 kg / h, isothermal compression of the second-stage compressor 32 can be achieved, and the displacement of the second-stage compressor can be effectively increased.

[0042] In some embodiments of this disclosure, reference is made to Figure 1 As shown, a third flow regulating valve 63 may be installed on the main pipeline 421, and a fourth flow regulating valve 64 may be installed on the first pipeline 41; this disclosure does not impose any limitations on this. Additionally, a pumping device 9 may be installed on the main pipeline 421 to facilitate the transport of liquid hydrogen. Furthermore, in an embodiment where the wet compression system includes a two-stage compressor, the outlet of the second-stage compressor 32 may be connected to the hydrogen storage tank 8.

[0043] The following will describe in detail the specific working process of the wet compression system in conjunction with the above-described specific embodiments. (Reference) Figure 1As shown, firstly, gaseous hydrogen in the hydrogen tanker 1 flows into the first mixing unit 43 via the first pipeline 41, and liquid hydrogen in the liquid hydrogen storage tank 2 flows to the atomizer 5 via the pumping device 9. Under the action of ultrasound, the liquid hydrogen is atomized into tiny droplets, which flow into the first mixing unit 43 via the first branch line 422. At this time, the gaseous hydrogen and the atomized liquid hydrogen are mixed in the first mixing unit 43 and then enter the first-stage compressor 31. In the membrane cavity of the first-stage compressor 31, a large amount of heat is generated during the gas compression process, so the gas temperature in the membrane cavity will rise rapidly. When liquid hydrogen is added, the high temperature environment in the membrane cavity of the first-stage compressor will cause the liquid hydrogen to undergo a phase change. During the process of liquid to gas conversion, a large amount of heat will be absorbed, thereby rapidly reducing the gas temperature in the membrane cavity, thus effectively reducing the exhaust temperature of the first-stage compressor 31 and facilitating the increase of the exhaust pressure of the first-stage compressor 31. Subsequently, the hydrogen discharged from the primary compressor 31 is mixed with the atomized liquid hydrogen in the second mixing unit 45 in the second branch 423, and then enters the secondary compressor 32. The vaporization of the liquid hydrogen can reduce the gas temperature in the membrane cavity of the secondary compressor 32, thereby reducing the exhaust temperature of the secondary compressor 32 and facilitating the increase of the exhaust pressure of the secondary compressor 32.

[0044] The preferred embodiments of this disclosure have been described in detail above with reference to the accompanying drawings. However, this disclosure is not limited to the specific details of the above embodiments. Within the scope of the technical concept of this disclosure, various simple modifications can be made to the technical solutions of this disclosure, and these simple modifications all fall within the protection scope of this 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, this disclosure will not describe the various possible combinations separately.

[0046] Furthermore, various different embodiments of this disclosure can be combined in any way, as long as they do not violate the spirit of this disclosure, they should also be regarded as the content disclosed in this disclosure.

Claims

1. A wet compression system for hydrogen, characterized in that, The wet compression system includes: Hydrogen tanker truck; Liquid hydrogen storage tank; At least one stage compressor, including a single stage compressor; and The connection structure includes a first pipeline and a second pipeline. The first pipeline is connected to the hydrogen tanker and is used to inject hydrogen into the first-stage compressor. The second pipeline includes a main pipeline and a first branch pipeline connected downstream of the main pipeline. 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. The connection structure includes a first mixing element, a first pipeline connecting the hydrogen tanker and a first inlet of the first mixing element, a first branch line connecting to a second inlet of the first mixing element, and an inlet of the first-stage compressor connecting to an outlet of the first mixing element. The connection structure also includes a third pipeline and a second mixing component, wherein the third pipeline is connected between the outlet of the first-stage compressor and the first inlet of the second mixing component; The second pipeline also includes a second branch line connected downstream of the main pipeline, the second branch line being connected to a second inlet of the second mixing component; The primary compressor also includes a secondary compressor, the inlet of which is connected to the outlet of the second mixing unit.

2. The wet compression system for hydrogen according to claim 1, characterized in that, An atomizer is installed on the main pipeline.

3. The wet compression system for hydrogen according to claim 1, characterized in that, Both the primary compressor and the secondary compressor are constructed as diaphragm compressors.

4. The wet compression system for hydrogen according to claim 1, characterized in that, Both the first and second hybrid components are constructed as tee pipes.

5. The wet compression system for hydrogen 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 located on the first branch line, and the first temperature sensor is located at the outlet of the first stage compressor. The controller is used to control the opening degree of the first flow regulating valve according to the first temperature sensor.

6. The wet compression system for hydrogen according to claim 5, characterized in that, The flow rate of the first flow regulating valve is 8.0 kg / h to 10.0 kg / h.

7. The wet compression system for hydrogen according to claim 1, 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 located on the second branch line, and the second temperature sensor is located at the outlet of the secondary compressor. The controller is used to control the opening degree of the second flow regulating valve according to the second temperature sensor.

8. The wet compression system for hydrogen according to claim 7, characterized in that, The flow rate of the second flow regulating valve is 7.0 kg / h to 8.0 kg / h.

Images