Hydrogen refueling station hydrogen cooling system adopting phase change cold storage

Abstract

The utility model provides a hydrogen refueling station hydrogen cooling system adopting phase change cold storage, which comprises a cold water main machine, a cooler, a gas filling machine, a cold supply water pump, a hydrogen storage device, a phase change cold storage device and a hydraulic module, the hydrogen storage device is communicated with the gas filling machine through a cooler, and the phase change cold storage device is connected into a cold supply loop through a hydraulic module. Therefore, the problems of long-time low-load operation and frequent starting and stopping of a traditional cooling system in the daytime can be solved, the equipment performance is improved, the service life is prolonged, meanwhile, a large amount of operation cost can be saved through the peak-valley electricity price difference, and the power grid load is balanced.

Description

Technical Field

[0001] This utility model relates to cooling technology, and more particularly to a hydrogen cooling system for hydrogen refueling stations that uses phase change cold storage. Background Technology

[0002] Hydrogen energy boasts advantages such as wide availability, being green and pollution-free, and high energy density, making it considered the most ideal clean energy source with enormous development potential. With the development of hydrogen energy technology, new energy vehicles powered by hydrogen are gradually gaining market recognition and promotion. As the basic energy supply infrastructure for hydrogen fuel cell vehicles, hydrogen refueling stations are currently a crucial hub for the demonstration and application of hydrogen energy in the transportation sector, significantly impacting the commercialization of hydrogen fuel cell technology and even the commercial application of the entire hydrogen energy industry. Countries and regions worldwide that prioritize environmentally friendly and clean energy development are actively participating in the deployment of hydrogen refueling stations.

[0003] Currently, hydrogen refueling stations are equipped with hydrogen cooling processes because the temperature of the hydrogen gas rises during the refueling process, which can affect the safety and continuity of the refueling operation. For this reason, existing hydrogen refueling stations are equipped with hydrogen cooling processes, as shown in the attached diagram. Figure 1 As shown, it typically uses an ethylene glycol chiller to produce low-temperature ethylene glycol, and then cools the flowing hydrogen through a cooler. However, this existing technology also has certain shortcomings. On the one hand, due to the intermittent and random nature of hydrogen refueling vehicles, the conventional hydrogen cooling system will start and stop frequently, resulting in unstable operating load, which seriously affects the performance and service life of the chiller and related auxiliary equipment. On the other hand, hydrogen refueling operations mainly occur during peak or off-peak electricity prices in the daytime, resulting in higher electricity costs for the chiller.

[0004] Therefore, there is an urgent need for an economical and reliable hydrogen cooling system to meet the requirements of "full charging and partial discharging", controllable start-stop, and safe and energy-saving use. Utility Model Content

[0005] Therefore, the main objective of this invention is to provide a hydrogen cooling system for hydrogen refueling stations that employs phase change cold storage, in order to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, according to one aspect of the present invention, a hydrogen cooling system for a hydrogen refueling station using phase change cold storage is provided, comprising: a chiller, a cooler, a gas dispenser, a chilled water pump, and a hydrogen storage device, further comprising: a phase change cold storage device and a hydraulic module, wherein the chiller establishes a cooling circuit with the cooler via the chilled water pump, the hydrogen storage device is connected to the gas dispenser via the cooler, and the phase change cold storage device is connected to the cooling circuit via the hydraulic module.

[0007] Preferably, the phase change cold storage device is provided with at least three parallel cooling modules, each of the parallel cooling modules is connected to the inlet and outlet of the phase change cold storage device through an electric valve, and the hydraulic module is communicated with the inlet and outlet of the phase change cold storage device.

[0008] Preferably, the hydraulic module comprises a plurality of electric on-off valves, an electric regulating valve, a first pipeline, a second pipeline, a third pipeline and a fourth pipeline, the inlet and outlet of the phase change cold storage device are connected to the fourth pipeline through the first pipeline and the third pipeline respectively, the second pipeline is communicated with the third pipeline and the output pipeline of the cooling circuit respectively, the fourth pipeline is connected to the input pipeline of the cooling circuit, the electric regulating valve is arranged on the first pipeline, the electric on-off valve is arranged on the second pipeline, the third pipeline and the fourth pipeline are communicated through the electric on-off valve, and the electric on-off valve is arranged on the fourth pipeline.

[0009] Preferably, the phase change material is stored in a container in the parallel cooling module, and the container is not in direct contact with the cooling medium transmitted by the water chiller in the cooling circuit.

[0010] Preferably, the container is in any one of a plate type, a ball type and a bag type.

[0011] Preferably, the container is made of any one of metal and plastic.

[0012] Preferably, the phase change material in the phase change cold storage device is inorganic hydrated salt.

[0013] Preferably, the cooling medium transmitted by the water chiller in the cooling circuit is ethylene glycol.

[0014] The hydrogen cooling system of the hydrogen station using phase change cold storage changes the system architecture of the traditional water chiller as the main cooling core, and instead designs a cold storage bypass including a phase change cold storage device and a hydraulic module in the traditional cooling circuit, so as to take the water chiller as a cold storage power source and take the phase change cold storage device as a system cooling core. This completely changes the low-level logic of the existing cooling system architecture, so that the water chiller can be operated at full load at night to store cold for the phase change cold storage device, and at the same time, the phase change cold storage device can be used for cooling during the daytime working period. Therefore, the problems of long-time low-load operation and frequent start-stop of the traditional cooling system during the daytime can be solved, the equipment performance and service life are improved, a large amount of operation cost can be saved by using the peak-valley electricity price difference, the power grid load is balanced, the power demand side management is improved, the continuous and stable operation of the gas filling operation is ensured, and considerable economic and social benefits are obtained. BRIEF DESCRIPTION OF DRAWINGS

[0015] The accompanying drawings, which form a part of this application, are included to provide a further understanding of the application and are incorporated in and constitute a part of this application. The embodiments of the application illustrated in the drawings are provided to enable a person skilled in the art to make or use the application and to explain the principles of the application. In the drawings:

[0016] Figure 1 Structure schematic diagram of hydrogen cooling system of prior art;

[0017] Figure 2 Structure schematic diagram of hydrogen cooling system of hydrogen filling station adopting phase change cold storage of the present application;

[0018] Figure 3 Structure schematic diagram of connection pipe of phase change cold storage device, hydraulic module and cold supply circuit of hydrogen cooling system of hydrogen filling station adopting phase change cold storage of the present application.

[0019] Explanation of reference signs

[0020] Cold water main machine 1, cooler 2, cold water supply pump 3, hydrogen storage device 4, gas dispenser 5, phase change cold storage device 6, hydraulic module 7, cold supply circuit 8, first pipeline 71, second pipeline 72, third pipeline 73, fourth pipeline 74. DETAILED DESCRIPTION

[0021] In order to make the purpose, technical scheme and advantages of the embodiments of the present application more clear, the technical scheme of the embodiments of the present application will be described clearly and completely below in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. The components of the embodiments of the present application described and shown in the drawings can be arranged and designed in various different configurations.

[0022] Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the claimed application, but only represents selected embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application.

[0023] It should be noted that: similar reference signs and letters represent similar items in the following drawings, therefore, once an item is defined in one drawing, it does not need to be further defined and explained in the subsequent drawings.

[0024] In the description of the utility model, it needs to be explained that, the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like indicate the orientation or positional relationship shown in the drawings, or the orientation or positional relationship commonly used when the utility model product is used, which is only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply that the indicated device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the utility model. In addition, the terms "first", "second", "third" and the like are only used for differentiation in description and cannot be understood as indicating or implying relative importance. The terms "include" and "have" and any variations thereof are intended to cover non-exclusive inclusion.

[0025] In addition, the terms "horizontal", "vertical", "overhanging" and the like do not mean that the components must be absolutely horizontal or overhanging, but can be slightly inclined. For example, "horizontal" only means that it is more horizontal relative to "vertical", and does not mean that the structure must be completely horizontal, but can be slightly inclined.

[0026] In the description of the utility model, it also needs to be explained that, unless otherwise specified and limited, the terms "set", "arrangement", "installation", "connected", "connected" should be broadly understood, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium, or it can be connected inside two elements. For ordinary skilled persons in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances and the prior art. In addition, the embodiments in the utility model and the features in the embodiments can be combined with each other without conflict. One or more of the components in the diagram can be necessary or unnecessary, and the relative positional relationship between the components in the above diagram can be adjusted according to actual needs.

[0027] In order to solve the problems of frequent start and stop, unstable operation load, affecting the performance and service life of the cold water host and related auxiliary equipment, and high electricity cost of the conventional hydrogen cooling system. The utility model intends to change the traditional system architecture with the cold water host as the main cooling core, and instead ingeniously set up a cold storage bypass mode including a phase change cold storage device and a hydraulic module in the traditional cooling circuit, so as to change the low-level logic of the existing cooling system architecture by taking the cold water host as a cold storage power source and the phase change cold storage device as a system cooling core, to solve the problems of frequent start and stop and high electricity cost.

[0028] For example, Figures 2 to 3As shown, the hydrogen cooling system of the hydrogen station using phase change cold storage provided by the utility model, examples include: cold water host 1, cooler 2, gas dispenser 5, cold water pump 3, hydrogen storage device 4, phase change cold storage device 6, hydraulic module 7, wherein the cold water host 1 is connected with the cooler 2 through the cold water pump 3 to establish a cold supply circuit 8, the hydrogen storage device 4 is communicated with the gas dispenser 5 through the cooler 2, the phase change cold storage device 6 is connected with the cold supply circuit 8 through the hydraulic module 7.

[0029] Specifically, as Figure 2 As shown, in the example, three parallel cooling modules (which can be expanded according to actual needs) are arranged in the phase change cold storage device 6, and each parallel cooling module is controlled by electric valves V1-V6 to access the inlet and outlet A / B of the phase change cold storage device 6, and the hydraulic module 7 is communicated with the inlet and outlet A / B of the phase change cold storage device 6.

[0030] In addition, in the preferred embodiment, the parallel cooling modules adopt unitized packaging, and inorganic hydrated salt phase change materials such as sodium chloride hydrated salt, potassium chloride hydrated salt, sodium carbonate hydrated salt and potassium carbonate hydrated salt are stored in the container to maintain non-direct contact with the cooling medium (such as glycol solution) transmitted in the cold supply circuit 8 by the cold water host 1, so as to ensure the safety and stability of the system.

[0031] The container structure is not limited to plate type, ball type, bag type, etc., and the packaging container material is preferably made of any one of metal (such as aluminum material) and plastic (such as polypropylene) to have the characteristics of large structural strength, corrosion resistance and oxidation resistance.

[0032] Through the above arrangement, power control and weak, medium and strong mode matching during the cold storage and release process can be realized, that is, V1-V4 switch controls the first parallel module, V2-V5 controls the second parallel module, and V3-V6 controls the third parallel module. When one of the parallel modules is opened, the weak cooling mode is corresponding, and single-gun gas filling is realized at this time; when two of the parallel modules are opened, the medium cooling mode is corresponding, and double-gun gas filling is realized at this time; when three of the parallel modules are opened, the strong cooling mode is corresponding, and three-gun gas filling is realized at this time, and so on, so as to realize controllable power. In addition, the three parallel cooling modules are relatively independent, and are easy to maintain and replace;

[0033] Among them, as Figure 2As shown, the water power module 7 in this example includes: several electrically operated on-off valves V7-V9, an electrically operated regulating valve V10, a first pipeline 71, a second pipeline 72, a third pipeline 73, and a fourth pipeline 74, wherein the inlet and outlet A / B of the phase change cold storage device 6 are connected with the C port of the first pipeline 71 and the D port of the third pipeline 73 respectively, and the first pipeline 71 and the third pipeline 73 are connected with the fourth pipeline 74 respectively; one end of the second pipeline 72 is connected with the third pipeline 73, and the G port at the other end is in communication with the output pipeline J of the cooling supply loop 8; the E port and the F port of the fourth pipeline 74 are connected with the H port and the I port of the input pipeline of the cooling supply loop 8 respectively; in addition, the first pipeline 71 is provided with the electrically operated regulating valve V10 for controlling the communication, the second pipeline 72 is provided with the electrically operated on-off valve V7 for controlling the communication, the third pipeline 73 and the fourth pipeline 74 are in communication through the electrically operated on-off valve V8, and the fourth pipeline 74 is provided with the electrically operated on-off valve V9 for controlling the communication.

[0034] Through the above arrangement, the following operation modes can be realized through the switching of the valve group in the water power module 7.

[0035] In the phase change cold storage mode, the low-temperature glycol solution is prepared by the cold water host 1 during the night valley electricity and hydrogenation idle period, and the prepared low-temperature glycol solution is delivered to the phase change cold storage device 6 by the cooling water pump 3 through the cooling supply loop 8 to store cold in the phase change cold storage device 6. At this time, V8 and V9 are closed, and V7 and V10 are opened.

[0036] In the phase change cold release mode, the cold water host 1 is not started during the day when the electricity price is high and the hydrogenation is concentrated, the cooling water pump 3 is started, and the glycol solution is used as a medium to deliver the cold in the phase change cold storage device 6 to the cooler 2 for hydrogen cooling. At this time, V7 and V9 are closed, V8 is opened, and V10 is regulated.

[0037] In the storage and supply mode, the cold water host 1 and the cooling water pump 3 are started during the night when the cold is stored and the hydrogenation is needed, the glycol solution is used as a medium to deliver the low-temperature glycol solution prepared by the cold water host 1 to the phase change cold storage device 6 and the cooler 2, and the cold storage of the phase change cold storage device 6 and the hydrogen cooling are completed at the same time. At this time, V9 is closed, V7 and V8 are opened, and V10 is regulated.

[0038] In the conventional cooling supply mode, the cold water host 1 provides the low-temperature glycol solution to the cooler 2 through the cooling water pump 3. When there is hydrogenation operation, the high-temperature hydrogen flows out from the hydrogen storage device 4, is cooled by the cooler 2 after heat exchange with the prepared low-temperature glycol solution, and then enters the gas dispenser 5. At the same time, the glycol solution is heated and flows back to the cold water host 1 through the cooling supply loop 8. At this time, V7, V8 and V10 are closed, and V9 is opened.

[0039] Experimental Example

[0040] Assuming a hydrogen station of 1000 kg hydrogen reserves, hydrogen cooling temperature difference 20 DEG C, hydrogen specific heat 14 kj / kg DEG C, hydrogen cooling required cold quantity 1000*14*20 / 1000 / 3.6=78 kwh, 80 kwh phase change cold storage module is configured to complete the daily hydrogen cooling required cold quantity.

[0041] According to the peak-valley electricity price difference 0.7 yuan / kwh, the compressor of the cold water host 1 has the energy efficiency ratio 2.5, and the annual operation cost can be saved 80*0.7*360 / 2.5=8064 yuan, which has considerable economic benefits.

[0042] If the technology is popularized in 1000 hydrogen stations, each hydrogen station can transfer 80 Kwh / 4h / 2.5=8kw of daytime peak power, and 1000 hydrogen stations can transfer 8000kw of peak power, which is beneficial to balance the power grid load, provide power grid efficiency, delay power plant construction, and has significant social value.

[0043] As described above, the hydrogen cooling system of the hydrogen station using the phase change cold storage changes the traditional system architecture of taking the cold water host 1 as the main cooling core, and instead designs a cold storage bypass including the phase change cold storage device 6 and the hydraulic module 7 in the traditional cooling circuit 8, so that the cold water host 1 is used as a cold storage power source, and the phase change cold storage device 6 is used as a system cooling core.

[0044] This completely changes the low-level logic of the existing cooling system architecture, so that the cold water host 1 can run at full load at night to store cold for the phase change cold storage device 6, and during the daytime working period, the phase change cold storage device 6 can be used for cooling, so that the problems of long-time low-load operation and frequent start-stop of the traditional cooling system during the day can be solved, the equipment performance and service life are improved, and a large amount of operation cost can be saved by using the peak-valley electricity price difference, the power grid load is balanced, and the power demand side management is improved, so that the continuous and stable operation of the gas filling operation is ensured, and the economic and social benefits are considerable.

[0045] The preferred embodiments of the utility model disclosed above are only used to help explain the utility model. The preferred embodiments do not describe all the details, and the utility model is limited to the specific implementation. Obviously, according to the content of the specification, many modifications and changes can be made. The embodiments are selected and described in the specification in order to better explain the principle and practical application of the utility model, so that the person skilled in the art can well understand and use the utility model. The utility model is limited by the claims and the whole scope and equivalents, and any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the utility model shall be included in the protection scope of the utility model.

[0046] Besides, various different embodiments of the utility model embodiment can be combined arbitrarily, as long as it does not violate the thought of the utility model embodiment, it should be considered as the content disclosed by the utility model embodiment.

Claims

1. A hydrogen cooling system for a hydrogen refueling station employing phase change cold storage, comprising: The cold water main engine, the cooler, the gas filling machine, the cold water supply pump, the hydrogen storage device, characterized in that further comprising: phase change cold storage device, hydraulic module, wherein the cold water main engine through the cold water supply pump and the cooler to establish the cold supply circuit, the hydrogen storage device and the gas filling machine through the cooler communication, the phase change cold storage device through the hydraulic module access to the cold supply circuit.

2. The phase change cryogenically cooled hydrogen station hydrogen cooling system of claim 1, wherein, The phase change cold storage device is provided with at least three parallel cooling modules, each of which is connected to the inlet and outlet of the phase change cold storage device through an electric valve.

3. The phase change cold storage hydrogen cooling system of claim 2, wherein, The hydraulic module comprises a plurality of electrically operated on-off valves, electrically operated regulating valves, first pipes, second pipes, third pipes and fourth pipes, wherein the inlet and outlet of the phase change cold storage device are connected to the fourth pipes through the first pipes and the third pipes, the second pipes are connected to the third pipes and the output pipes of the cold supply circuit, the fourth pipes are connected to the input pipes of the cold supply circuit, the first pipes are provided with electrically operated regulating valves, the second pipes are provided with electrically operated on-off valves, the third pipes and the fourth pipes are connected through electrically operated on-off valves, and the fourth pipes are provided with electrically operated on-off valves.

4. The phase change cryogenically cooled hydrogen station hydrogen cooling system of claim 2, wherein, The parallel cooling modules use containers to store phase change materials, which are not in direct contact with the cooling medium transmitted in the cold supply circuit by the cold water main engine.

5. The phase change cold storage hydrogen cooling system of claim 4, wherein, The containers are in any one of the forms of plate type, ball type and bag type.

6. The phase change cold storage hydrogen cooling system of claim 4, wherein, The containers are made of any one of metal and plastic.

7. The phase change cold accumulation hydrogen cooling system for a hydrogen station according to any one of claims 1 to 6, characterized by, The phase change materials in the phase change cold storage device are inorganic hydrated salts.

8. The phase change cold accumulation hydrogen cooling system for a hydrogen station according to any one of claims 1 to 6, characterized by, The cooling medium transmitted in the cold supply circuit by the cold water main engine is ethylene glycol.

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