Gravity return type hydrogen storage and gas supply device and system

Abstract

The utility model relates to a kind of gravity backflow type hydrogen storage and gas supply device, system.The device includes storage pipeline, multiple hydrogen storage tanks and at least two water storage tanks, and power mechanism.Storage pipeline is used to store hydrogen obtained by hydrogen production equipment into hydrogen storage tank.Each water storage tank is lower than each hydrogen storage tank in gravity direction, and each water storage tank is communicated with each hydrogen storage tank by first connecting pipeline and second connecting pipeline.Power mechanism is arranged between water storage tank and hydrogen storage tank, and water in water storage tank can be transferred to hydrogen storage tank via first connecting pipeline, so that hydrogen storage tank can provide hydrogen outward.When hydrogen storage tank completes gas supply outward, water in hydrogen storage tank can flow back to water storage tank via second connecting pipeline under the action of gravity, and water in next water storage tank can enter next hydrogen storage tank via first connecting pipeline under the action of power mechanism.The device has low power consumption, low cost, high safety, good operation economy.

Description

Technical Field

[0001] This utility model relates to the field of hydrogen storage and supply technology, and in particular to a gravity reflux type hydrogen storage and supply device and system. Background Technology

[0002] For applications where hydrogen is used as a raw material (such as for the production of green liquid fuels and pipeline hydrogen), direct hydrogen storage is the most economical and efficient method. A hydrogen storage and transportation system must be built. When renewable power is sufficient, multiple electrolyzers are used to accelerate the production and storage of hydrogen. When the output of renewable power decreases or stops, the stored hydrogen is then transported out.

[0003] Existing hydrogen storage methods include compressed hydrogen storage, liquid hydrogen storage, organic liquid storage, and metal hydrogen storage, among others. The most common method is compressed hydrogen storage, where hydrogen produced by water electrolysis is compressed by a compressor (or directly introduced into the storage tank at a pressure of 1.6MPa-3.0MPa after water electrolysis without compression) before entering the storage tank. When hydrogen is needed, the hydrogen in the tank is released. Because the tank pressure changes during the hydrogen storage and release process, a compressor must be used to compress the hydrogen when the pressure in the tank is lower than the hydrogen usage pressure. To release as much hydrogen as possible from the tank, the compressor inlet pressure is reduced, resulting in high power consumption for the hydrogen compressor. Due to the disadvantages of hydrogen, such as difficulty in compression, small molecular weight leading to easy leakage, wide explosive range, poor safety, and hydrogen embrittlement, existing compressed hydrogen storage devices involve large investments, high energy consumption, and poor safety.

[0004] Therefore, there is an urgent need for a hydrogen storage and supply system that is low in power consumption, low in cost, and high in safety. Utility Model Content

[0005] One objective of this invention is to overcome the shortcomings of existing technologies and provide a gravity-fed reflux hydrogen storage and supply device. To solve the aforementioned technical problems, this invention adopts the following technical solution:

[0006] A gravity reflux hydrogen storage and supply device includes:

[0007] Storage pipelines are used to connect to hydrogen production equipment to receive hydrogen gas;

[0008] Multiple hydrogen storage tanks are connected in parallel downstream of the hydrogen production equipment, and the storage pipeline can input the received hydrogen into each hydrogen storage tank for storage.

[0009] At least two water storage tanks, each water storage tank being lower than each hydrogen storage tank in the direction of gravity, and each water storage tank being connected to each hydrogen storage tank through a first connecting pipe and a second connecting pipe respectively;

[0010] The power mechanism is located between the water storage tank and the hydrogen storage tank. The power mechanism can transfer water in the water storage tank to the hydrogen storage tank through the first connecting pipeline, so that the hydrogen storage tank can supply hydrogen to the outside.

[0011] After the hydrogen storage tank finishes supplying gas, the water in the hydrogen storage tank can flow back to the water storage tank through the second connecting pipe under the action of gravity. At the same time, the water in the next water storage tank can enter the next hydrogen storage tank through the first connecting pipe under the action of the power mechanism.

[0012] In one embodiment, the time it takes for water to return from any hydrogen storage tank to any water storage tank coincides with the time it takes for water to enter another hydrogen storage tank from another water storage tank.

[0013] In one embodiment, the power mechanism includes a water pump and a speed regulator. The speed regulator is electrically connected to the water pump and can control the operation of the water pump according to the pipeline network pressure of the storage pipeline and the liquid level in each hydrogen storage tank and each water storage tank, so as to adjust the flow rate of the first connecting pipeline.

[0014] In one embodiment, each hydrogen storage tank is provided with a water inlet at the bottom, each water storage tank is provided with a water outlet at the bottom, and the two ends of each first connecting pipe are respectively connected to the water inlet and the water outlet.

[0015] An inlet valve is provided at the inlet, and an outlet valve is provided at the outlet.

[0016] In one embodiment, the inlet valve is a flow regulating valve, which is used to control the flow rate of water entering the hydrogen storage tank according to the pipeline network pressure and the liquid level in the hydrogen storage tank.

[0017] In one embodiment, each hydrogen storage tank is provided with a drain outlet at the bottom, each water storage tank is provided with a return water outlet on the side, and the two ends of each second connecting pipe are respectively connected to the drain outlet and the return water outlet.

[0018] A drain valve is installed at the drain outlet, and a return valve is installed at the return outlet.

[0019] In one embodiment, the gravity reflux hydrogen storage and supply device includes a heating device installed on the pipeline connecting the water tank and the hydrogen storage tank. The heating device is used to heat the water entering the hydrogen storage tank and the water tank.

[0020] In one embodiment, the heating device is a heat exchanger, and the heat of the heating device comes from the heat of combustion of hydrogen produced by the hydrogen production equipment.

[0021] Alternatively, the heating device can be an electric heater, which can directly use renewable electricity for heating.

[0022] In one embodiment, the gravity reflux hydrogen storage and supply device includes a hydrogen recovery device, which is connected to the top of each water storage tank. When the water in the hydrogen storage tank flows back into the water storage tank under the action of gravity, the hydrogen recovery device can recover the hydrogen in the water storage tank.

[0023] In one embodiment, the hydrogen recovery device includes an airbag that is connected to the top of each water storage tank.

[0024] In one embodiment, each hydrogen storage tank is connected to a gas phase pipeline at its top, and each gas phase pipeline is connected to a storage pipeline. Each gas phase pipeline is equipped with a gas phase valve.

[0025] In one embodiment, the gravity reflux hydrogen storage and supply device includes a hydrogen regulating valve, which is installed on the storage pipeline and is used to control the flow rate of hydrogen entering each hydrogen storage tank according to the hydrogen temperature in each hydrogen storage tank.

[0026] Another objective of this utility model is to provide a gravity reflux hydrogen storage and supply system, including a hydrogen production device and a gravity reflux hydrogen storage and supply device as described in any of the above, wherein the storage pipeline is connected to the outlet end of the hydrogen production device.

[0027] The outlet of the hydrogen production equipment is also connected to a hydrogen use pipeline. The hydrogen use pipeline is set up in parallel with the storage pipeline, and the hydrogen supplied by each hydrogen storage tank can be merged into the hydrogen use pipeline.

[0028] As can be seen from the above technical solution, this utility model has at least the following advantages and positive effects:

[0029] In this invention, a gravity-fed reflux hydrogen storage and supply device includes a storage pipeline, multiple hydrogen storage tanks, at least two water storage tanks, and a power mechanism. The storage pipeline stores hydrogen produced by the hydrogen production equipment into the hydrogen storage tanks. Each water storage tank is lower than each hydrogen storage tank in the direction of gravity, and each water storage tank is connected to each hydrogen storage tank via a first connecting pipeline and a second connecting pipeline. The power mechanism is located between the water storage tanks and the hydrogen storage tanks, and can transfer water from the water storage tanks to the hydrogen storage tanks via the first connecting pipeline, enabling the hydrogen storage tanks to supply hydrogen. After the hydrogen storage tanks have finished supplying hydrogen, the water in the hydrogen storage tanks can flow back to the water storage tanks under gravity via the second connecting pipeline, while water from the next water storage tank can enter the next hydrogen storage tank via the first connecting pipeline under the action of the power mechanism.

[0030] This invention relates to a gravity-fed reflux hydrogen storage and supply device. The device utilizes the hydrogen pressure from the hydrogen production equipment to fill each hydrogen storage tank. The system employs a power mechanism and uses water as the driving medium to sequentially supply hydrogen from multiple storage tanks. Therefore, the storage and supply process eliminates the need for expensive hydrogen compressors, resulting in improved safety, lower power consumption, higher reliability, and significantly reduced costs. Furthermore, the low residual hydrogen level in each filling and discharging process enhances the utilization rate of the hydrogen storage tanks, further saving on investment costs.

[0031] Furthermore, by setting each water storage tank lower than the hydrogen storage tank, once all the water in the water tank has been transferred to the hydrogen storage tank, allowing all the hydrogen in the hydrogen storage tank to be completely discharged, the water in the hydrogen storage tank can automatically flow back to the water storage tank under gravity. This effectively reduces pipeline complexity and control difficulty, decreases system operating energy consumption, and improves system operating economy. Moreover, while the water in the hydrogen storage tank is flowing back to one water tank, water from another water tank can be supplied to another hydrogen storage tank to achieve gas supply. This effectively improves the continuity of the gas supply process, saves process time, and increases gas supply efficiency. Attached Figure Description

[0032] Figure 1 This is a schematic diagram of the structure of a gravity reflux hydrogen storage and supply system according to an embodiment of the present invention.

[0033] Figure 2 yes Figure 1 The diagram shows the gas filling stage of the system during the large-scale hydrogen production process in the hydrogen production equipment. Figure 1 .

[0034] Figure 3 yes Figure 1 The diagram shows the gas filling stage of the system during the large-scale hydrogen production process in the hydrogen production equipment. Figure 2 .

[0035] Figure 4 yes Figure 1 The diagram shows the gas filling stage of the system when the hydrogen-using equipment does not require hydrogen.

[0036] Figure 5 yes Figure 1 The diagram shows the gas supply phase of the system when hydrogen production from the hydrogen production equipment is insufficient. Figure 1 .

[0037] Figure 6 yes Figure 1 The diagram shows the gas supply phase of the system when hydrogen production from the hydrogen production equipment is insufficient. Figure 2 .

[0038] Figure 7 yes Figure 1The diagram shows the gas supply phase of the system when hydrogen production from the hydrogen production equipment is insufficient. Figure 3 .

[0039] Figure 8 yes Figure 1 The diagram shows the gas supply phase of the system when the hydrogen production equipment stops working.

[0040] The annotations in the attached figures are explained as follows:

[0041] 10 - Hydrogen production equipment; 20 - Hydrogen consumption equipment; 30 - Hydrogen consumption pipelines;

[0042] 100 - Storage pipeline; 110 - Hydrogen regulating valve;

[0043] 200 - Hydrogen storage tank; 210 - Gas phase pipeline; 211 - Gas phase valve; 220 - Water inlet; 221 - Water inlet valve; 230 - Drain outlet; 231 - Drain valve;

[0044] 300 - Water storage tank; 310 - Water outlet; 311 - Water outlet valve; 320 - Water return port; 321 - Water return valve;

[0045] 400 - First connecting pipe; 500 - Second connecting pipe;

[0046] 600 - Power mechanism; 610 - Water pump; 620 - Speed ​​controller;

[0047] 700 - Heating device; 800 - Hydrogen recovery device; 810 - Airbag. Detailed Implementation

[0048] Typical embodiments embodying the features and advantages of this utility model will be described in detail in the following description. It should be understood that this utility model can have various variations in different embodiments, all of which do not depart from the scope of this utility model, and the descriptions and illustrations therein are for illustrative purposes only and not intended to limit this utility model.

[0049] In the description of this application, it should be understood that, in the embodiments shown in the accompanying drawings, the indications of direction or positional relationships (such as up, down, left, right, front, and back) are merely for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. These descriptions are appropriate when these elements are in the positions shown in the accompanying drawings. If the description of the positions of these elements changes, these directional indications also change accordingly.

[0050] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the stated features. In the description of this application, "a plurality of" means two or more, unless otherwise explicitly specified.

[0051] See Figure 1 As shown, this embodiment of the invention provides a gravity reflux hydrogen storage and supply system, including a hydrogen production device 10 and a gravity reflux hydrogen storage and supply device. The hydrogen production device 10 is used to produce hydrogen. For example, the hydrogen production device 10 can be an electrolysis water hydrogen production device 10, which can utilize renewable electricity to produce hydrogen. The renewable electricity can be wind power or solar power, etc.

[0052] The number of hydrogen production devices 10 can be one or more. When there are multiple hydrogen production devices 10, they are connected in parallel.

[0053] like Figure 1 As shown, the outlet end of the hydrogen production equipment 10 is connected to a hydrogen-using pipeline 30. The hydrogen production equipment 10 can be connected to a downstream hydrogen-using equipment 20 via the hydrogen-using pipeline 30 to supply hydrogen to the hydrogen-using equipment 20.

[0054] like Figure 1 As shown, the gravity reflux hydrogen storage and supply device includes a storage pipeline 100, which is connected to the outlet end of the hydrogen production equipment 10. The storage pipeline 100 and the hydrogen consumption pipeline 30 are connected in parallel. Therefore, the storage pipeline 100 and the hydrogen consumption pipeline 30 can simultaneously receive hydrogen produced by the hydrogen production equipment 10.

[0055] For example, the storage pipeline 100 can receive hydrogen produced by the hydrogen production equipment 10 and store the hydrogen in the hydrogen storage tank 200. For instance, when the hydrogen produced by the hydrogen production equipment 10 exceeds the hydrogen consumption of the downstream hydrogen-using equipment 20, the excess hydrogen can be transported through the storage pipeline 100 to each hydrogen storage tank 200 for storage, i.e., the system enters the filling stage.

[0056] like Figure 1 As shown, the storage pipeline 100 can be connected to the downstream hydrogen-using equipment 20 to supply hydrogen from the hydrogen storage tank 200 to the hydrogen-using equipment 20. For example, when the amount of hydrogen produced by the hydrogen production equipment 10 is less than the amount of hydrogen required by the downstream hydrogen-using equipment 20, the insufficient hydrogen can be supplemented by hydrogen from each hydrogen storage tank 200, that is, the system enters the gas supply stage.

[0057] The following detailed description, in conjunction with the accompanying drawings, describes specific embodiments of the gravity reflux hydrogen storage and supply device of this application.

[0058] See Figure 1 As shown, the gravity reflux hydrogen storage and supply device of this utility model embodiment includes a storage pipeline 100, a plurality of hydrogen storage tanks 200 and at least two water storage tanks 300, and a power mechanism 600.

[0059] The storage pipeline 100 is connected between the hydrogen production equipment 10 and the hydrogen consumption equipment 20, and is arranged in parallel with the hydrogen consumption pipeline 30. The storage pipeline 100 can be used to receive hydrogen produced by the hydrogen production equipment 10 and store the hydrogen in each hydrogen storage tank 200 so that the hydrogen in each hydrogen storage tank 200 can be delivered to the hydrogen consumption equipment 20 when needed.

[0060] like Figure 1 As shown, multiple hydrogen storage tanks 200 are arranged in parallel downstream of the hydrogen production equipment 10. Each hydrogen storage tank 200 can be a cylindrical tank. It is understood that in other embodiments, each hydrogen storage tank 200 can also be a spherical tank or a tank of other shapes.

[0061] like Figure 1 As shown, each hydrogen storage tank 200 is connected to the storage pipeline 100. Each hydrogen storage tank 200 can be used to store hydrogen. For example, when the system enters the charging stage, the hydrogen production equipment 10 can supply hydrogen to each hydrogen storage tank 200 through the storage pipeline 100.

[0062] See Figure 1 In one embodiment, each hydrogen storage tank 200 is connected to a gas phase pipeline 210 at its top, and each gas phase pipeline 210 is connected to a storage pipeline 100. Thus, the hydrogen production equipment 10 can be connected to the corresponding hydrogen storage tank 200 through the storage pipeline 100 and each gas phase pipeline 210. Each hydrogen storage tank 200 can also be connected to the downstream hydrogen-using equipment 20 through the corresponding gas phase pipeline 210 and storage pipeline 100.

[0063] like Figure 1 As shown, each gas phase pipeline 210 is equipped with a gas phase valve 211. The gas phase valve 211 can be a bidirectional valve. When hydrogen needs to be added to the hydrogen storage tank 200, the gas phase valve 211 on the gas phase pipeline 210 is opened, allowing the hydrogen produced by the hydrogen production equipment 10 to enter the hydrogen storage tank 200. When the hydrogen storage tank 200 supplies gas to the outside, the gas phase valve 211 on the gas phase pipeline 210 is opened, allowing the hydrogen in the hydrogen storage tank 200 to be supplied to the outside.

[0064] See Figure 1As shown, in one embodiment, the gravity reflux hydrogen storage and supply device includes a hydrogen regulating valve 110, which is installed on the storage pipeline 100. The hydrogen regulating valve 110 is used to control the flow rate of hydrogen entering each hydrogen storage tank 200 according to the hydrogen temperature in each hydrogen storage tank 200.

[0065] Specifically, when the temperature of hydrogen in the hydrogen storage tank 200 changes beyond a reasonable range, the hydrogen regulating valve 110 can adjust its opening to control the amount of hydrogen entering the hydrogen storage tank 200, thereby achieving the purpose of controlling the temperature change of hydrogen in the hydrogen storage tank 200 and ensuring that the temperature of hydrogen in the hydrogen storage tank 200 is maintained within a reasonable range.

[0066] Optionally, in some embodiments, when the temperature change of hydrogen in hydrogen storage tank 200 exceeds a reasonable range, the system can open the gas phase valve 211 of adjacent hydrogen storage tank 200. This allows the system to simultaneously fill multiple hydrogen storage tanks 200 with hydrogen, thereby reducing the temperature rise of the hydrogen.

[0067] For ease of description, the following description will use an example of a device consisting of four hydrogen storage tanks: 200A, 200B, 200C, and 200D. Figure 2 and Figure 3 As shown, when hydrogen is being charged into hydrogen storage tank 200A, if the system detects that the temperature change of hydrogen in hydrogen storage tank 200A exceeds a reasonable range, the gas phase valve 211 on hydrogen storage tank 200B can be opened. Then, the hydrogen production equipment 10 can charge hydrogen into hydrogen storage tank 200A and hydrogen storage tank 200B simultaneously through storage pipeline 100 to reduce the temperature rise of hydrogen.

[0068] Therefore, in the embodiments of this utility model, by regulating the hydrogen regulating valve 110, or by opening the gas phase valve 211 of the adjacent hydrogen storage tank 200, the hydrogen temperature in the hydrogen storage tank 200 can be maintained within a reasonable range. For example, the temperature variation range of the hydrogen in the hydrogen storage tank 200 can be kept within 50°C to 60°C.

[0069] See Figure 1 At least two water storage tanks 300 are arranged in parallel downstream of the hydrogen production equipment 10. Each water storage tank 300 can be a cylindrical tank. It is understood that in other embodiments, each water storage tank 300 can also be a spherical tank or a tank of other shapes.

[0070] In this invention, each water storage tank 300 is lower than each hydrogen storage tank 200 in the direction of gravity, and each water storage tank 300 is connected to each hydrogen storage tank 200 through a first connecting pipe 400 and a second connecting pipe 500. That is, each water storage tank 300 can be connected to a hydrogen storage tank 200 through a first connecting pipe 400, and each water storage tank 300 can also be connected to a hydrogen storage tank 200 through a second connecting pipe 500.

[0071] See Figure 5 and Figure 6 In this embodiment of the invention, the first connecting pipe 400 is used for water to flow from the water storage tank 300 to the hydrogen storage tank 200, and the second connecting pipe 500 is used for water to flow from the hydrogen storage tank 200 to the water storage tank 300, as detailed below. It is understood that in other embodiments, the functions of the first connecting pipe 400 and the second connecting pipe 500 can be interchanged.

[0072] like Figure 1 As shown, the power unit 600 is located between the water storage tank 300 and the hydrogen storage tank 200. The power unit 600 is mainly used to transfer the water in the water storage tank 300 to the hydrogen storage tank 200, so as to use the water to squeeze the hydrogen in the hydrogen storage tank 200 outward to the storage pipeline 100 and supply it to the downstream hydrogen-using equipment 20.

[0073] For example, when the system enters the gas supply phase, the power unit 600 can transfer water in the water storage tank 300 to the hydrogen storage tank 200 via the first connecting pipe 400, so that the hydrogen storage tank 200 can supply hydrogen to the outside. Here, the power unit 600 can be a water pump.

[0074] Therefore, in the gravity reflux hydrogen storage and supply device of this utility model, the hydrogen storage tank 200 can switch back and forth between the states of no load, water storage or hydrogen storage, and the water storage tank 300 can switch back and forth between the states of water storage or no load, thereby realizing the storage of hydrogen or the supply of hydrogen to the outside.

[0075] Optionally, the effective volume of each water storage tank 300 can be equal to or approximately equal to the effective volume of each hydrogen storage tank 200. Thus, when water in a water-filled storage tank 300 is completely transferred to a hydrogen-filled storage tank 200, the hydrogen in the hydrogen storage tank 200 can be completely discharged.

[0076] It should be noted that, in the embodiments of this utility model, the pressure of the hydrogen produced by the hydrogen production equipment 10 can be 1.6 MPa or higher. Therefore, the network pressure of the hydrogen pipeline 20 and the storage pipeline 100 can also be 1.6 MPa or higher. The pressure of each hydrogen storage tank 200 and each water storage tank 300 can also be 1.6 MPa or higher. The working pressure of the power mechanism 600 can be not less than 1.6 MPa. This ensures that the entire system maintains pressure balance during operation.

[0077] It is understood that when the hydrogen pressure required by the hydrogen-using device 20 is 1.6 MPa, the hydrogen supplied by the hydrogen production device 10 through the hydrogen-using pipeline 20 and the storage pipeline 100 in the system of this utility model can meet the pressure requirement of the hydrogen-using device 20. When the hydrogen pressure required by the hydrogen-using device 20 is greater than the hydrogen pressure produced by the hydrogen production device 10, pressurization equipment can be installed on the hydrogen-using pipeline 20 and the storage pipeline 100 to pressurize the hydrogen to the required pressure. The specific settings can be configured according to actual needs.

[0078] In this invention, after the hydrogen storage tank 200 has finished supplying gas, the water inside the hydrogen storage tank 200 can flow back to the water storage tank 300 through the second connecting pipe 500 under the action of gravity. For ease of description, the following description will use an example of a device including two water storage tanks 300A and 300B.

[0079] For example, refer to Figure 5 and Figure 6 As shown, when water in water storage tank 300A enters hydrogen storage tank 200A, it forces hydrogen outwards, completely expelling the hydrogen from hydrogen storage tank 200A. After this process, hydrogen storage tank 200A will be filled with water, while water storage tank 300A will become empty. Because water storage tank 300A is lower than hydrogen storage tank 200A in the direction of gravity, water in hydrogen storage tank 200A can flow back into water storage tank 300A via the second connecting pipe 500 under the influence of gravity.

[0080] In this invention, a second connecting pipe 500 is provided to connect the hydrogen storage tank 200 and the water storage tank 300, and the hydrogen storage tank 200 and the water storage tank 300 have a height difference so that the water in the hydrogen storage tank 200 can automatically return to the water storage tank 300. This effectively reduces the complexity of the pipeline and the difficulty of control, reduces the energy consumption of the system, and improves the economic efficiency of the system operation.

[0081] It is understandable that during the water return process, in addition to the effect of gravity, the water can also flow back to the water storage tank 300 through the second connecting pipe 500 under the expansion effect of the residual gas in the clearance volume of the hydrogen storage tank 200.

[0082] In this invention, while water in the hydrogen storage tank 200 flows back to the water storage tank 300, water in the next water storage tank 300 can enter the next hydrogen storage tank 200 via the first connecting pipe 400 under the action of the power mechanism 600. Specifically, refer to... Figure 5 and Figure 6 As shown, while the water in the hydrogen storage tank 200A flows back to the water storage tank 300A through the second connecting pipe 500, the water in the water storage tank 300B can enter the hydrogen outlet storage tank 200B through the first connecting pipe 400 under the action of the power mechanism 600.

[0083] In other words, in this invention, the return water from one water storage tank 300 and the outlet water from another water storage tank 300 occur simultaneously. This effectively improves the continuity of the system's gas supply process and saves process time.

[0084] Optionally, the return water time of any one water storage tank 300 is set to be equal to the outlet water time of the other water storage tank 300. That is, the time for water to return from any hydrogen storage tank 200 to any water storage tank 300 is consistent with the time for water to enter another hydrogen storage tank 200 from another water storage tank 300. This can effectively improve the continuity of the gas supply process, save process time, and improve the operating efficiency of the system.

[0085] For example, before the device is put into operation, the drainage speed of the hydrogen storage tank 200 can be controlled by setting the height difference between the water storage tank 300 and the hydrogen storage tank 200, and / or by designing the clearance volume inside the hydrogen storage tank 200, thereby controlling the return water time and ensuring that the return water time and the water outlet time are consistent.

[0086] During the operation of the device, the water discharge speed of the water storage tank 300 can be controlled by adjusting the frequency of the water pump and / or adjusting the water flow rate of the water storage tank 300, thereby controlling the water discharge time and ensuring that the return water time and the water discharge time are consistent.

[0087] Alternatively, the return water time can be controlled by adjusting the drainage flow rate of the hydrogen storage tank 200 to ensure that the return water time and the outlet water time are consistent.

[0088] See Figure 1 In some embodiments, the power mechanism 600 includes a water pump 610 and a speed regulator 620, with the speed regulator 620 electrically connected to the water pump 610. The speed regulator 620 can control the operation of the water pump 610 according to the network pressure of the storage pipeline 100 to adjust the flow rate of the first connecting pipeline 400, thereby controlling the water flow rate entering the hydrogen storage tank 200 and thus controlling the hydrogen supply to the hydrogen storage tank 200, which is beneficial to ensuring a constant hydrogen pressure.

[0089] It is understandable that the speed controller 620 can also control the operation of the water pump 610 according to the liquid level in each hydrogen storage tank 200 and the liquid level in each water storage tank 300, so as to adjust the water flow rate of the first connecting pipe 400, thereby controlling the water outlet time of the water storage tank 300 to ensure that the return water time and the water outlet time are consistent.

[0090] See Figure 1 In one embodiment, each hydrogen storage tank 200 is provided with a water inlet 220 at the bottom, and each water storage tank 300 is provided with a water outlet 310 at the bottom. The two ends of each first connecting pipe 400 are respectively connected to the water inlet 220 and the water outlet 310.

[0091] The water inlet 220 can be located on one side wall of the bottom of the hydrogen storage tank 200. Alternatively, in other embodiments, the water inlet 220 can be located at other positions on the bottom of the hydrogen storage tank 200.

[0092] The outlet 310 can be located at the lowest point of the bottom of the water storage tank 300 so that all the water in the water storage tank 300 can be discharged. Alternatively, in other embodiments, the outlet 310 can be located at other positions on the bottom of the water storage tank 300.

[0093] like Figure 1 As shown in the example, an inlet valve 221 is provided at the water inlet 220. The inlet valve 221 can be a flow regulating valve. The inlet valve 221 can control the water flow rate entering the hydrogen storage tank 200 according to the pipeline pressure of the storage pipeline 100. For example, during the gas supply phase, the inlet valve 221 can adjust the water flow rate entering the hydrogen storage tank 200 according to the pipeline pressure of the storage pipeline 100, thereby regulating the amount of hydrogen discharged from the hydrogen storage tank 200 to ensure a constant hydrogen pressure throughout the system.

[0094] Optionally, the inlet valve 221 can also control the water flow rate entering the hydrogen storage tank 200 according to the liquid level in the hydrogen storage tank 200, thereby indirectly controlling the water outlet speed of the water storage tank 300, which helps to ensure that the return water time and the water outlet time are consistent.

[0095] It is understood that in other embodiments, the water inlet valve 221 may also be a one-way valve. When it is necessary to input water from the water storage tank 300 into the hydrogen storage tank 200, the water inlet valve 221 can be opened. Conversely, the water inlet valve 221 is closed.

[0096] like Figure 1 As shown in the example, a water outlet valve 311 is provided at the water outlet 310. The water outlet valve 311 can be a one-way valve. When it is necessary to input water from the water storage tank 300 into the hydrogen storage tank 200, the water outlet valve 311 can be opened. Conversely, the water outlet valve 311 is closed.

[0097] It is understood that in other embodiments, the outlet valve 311 may also be a flow regulating valve. The outlet valve 311 can control the outlet flow of the water storage tank 300 according to the liquid level in the water storage tank 300, thereby helping to ensure that the return water time and the outlet water time are consistent.

[0098] See Figure 1 In one embodiment, each hydrogen storage tank 200 is provided with a drain outlet 230 at its bottom, and each water storage tank 300 is provided with a return water outlet 320 on its side. The two ends of each second connecting pipe 500 are respectively connected to the drain outlet 230 and the return water outlet 320.

[0099] The drain outlet 230 can be located at the lowest point of the bottom of the hydrogen storage tank 200 so that all the water in the hydrogen storage tank 200 can be drained out as much as possible. Alternatively, in other embodiments, the drain outlet 230 can be located at other positions at the bottom of the drain outlet 230.

[0100] The return water inlet 320 can be located on one side wall of the middle part of the water storage tank 300. Alternatively, in other embodiments, the return water inlet 320 can also be located at other positions on the side wall of the water storage tank 300, such as near the top.

[0101] like Figure 1 As shown in the example, a drain valve 231 is provided at the drain outlet 230. The drain valve 231 can be a one-way valve. When it is necessary to return water from the hydrogen storage tank 200 to the water storage tank 300, the drain valve 231 can be opened. Conversely, the drain valve 231 is closed.

[0102] It is understood that in other embodiments, the drain valve 231 can be a flow regulating valve. The drain valve 231 can control the drainage flow of the hydrogen storage tank 200 according to the liquid level in the hydrogen storage tank 200, thereby helping to ensure that the return water time and the outlet water time are consistent.

[0103] like Figure 1 As shown in the example, a return water valve 321 is provided at the return water inlet 320. The return water valve 321 can be a one-way valve. When it is necessary to return water from the hydrogen storage tank 200 to the water storage tank 300, the return water valve 321 can be opened. Conversely, the return water valve 321 is closed.

[0104] It is understood that in other embodiments, the return water valve 321 can be a flow regulating valve. The return water valve 321 can control the flow rate of water entering the water storage tank 300 according to the liquid level in the water storage tank 300, thereby helping to ensure that the return water time and the water outlet time are consistent.

[0105] See Figure 1In one embodiment, the gravity reflux hydrogen storage and supply device includes a heating device 700, which is installed on the pipeline connecting the water storage tank 300 and the hydrogen storage tank 200. The heating device 700 is used to heat the water entering the hydrogen storage tank 200 and the water storage tank 300.

[0106] For example, such as Figure 1 As shown, the heating device 700 can be installed on the first connecting pipe 400. When water in the water storage tank 300 enters the hydrogen storage tank 200 through the first connecting pipe 400, the heating device 700 can heat the water entering the hydrogen storage tank 200. Thus, when the water in the hydrogen storage tank 200 flows back to the water storage tank 300, the water in the water storage tank 300 is also heated water.

[0107] It is understood that in other embodiments, the heating device 700 may also be installed on the second connecting pipe 400. Thus, the heating device 700 can heat the water entering the water storage tank 300, and the heated water can then enter the hydrogen storage tank 200.

[0108] The heating device 700 can be a heat exchanger, and its heat source can be various forms such as waste heat provided by the downstream chemical process or the heat generated by the combustion of hydrogen produced by the hydrogen production equipment 10. For example, the downstream chemical process can be a liquid fuel synthesis process, utilizing the heat generated from the synthesis of alcohol fuels from hydrogen and carbon.

[0109] Alternatively, the heating device 700 can be an electric heater, which can directly use renewable electricity for electric heating.

[0110] In the embodiments of this utility model, by setting a heating device 700, the water entering the hydrogen storage tank 200 and the water storage tank 300 can be heated, avoiding the situation where the inner wall of the hydrogen storage tank 200 and the water storage tank 300 is prone to freezing when storing water in a low-temperature environment, thereby broadening the application range of the system.

[0111] For example, if the project site is located in a northern region where winter temperatures are low, the inner surface of the water storage tank 300 may freeze, affecting the hydrogen supply of the hydrogen storage tank 200. For instance, when the water temperature inside the tank is below 5°C, the heating device 700 needs to be turned on to raise the water temperature inside the tank and prevent freezing or melting.

[0112] In addition, depending on the actual situation of the project, in low-temperature areas, the equipment pipeline section, such as each first connecting pipeline 400 and each second connecting pipeline 500, can be provided with heat tracing to prevent local freezing and blockage of the pipeline.

[0113] See Figure 1In one embodiment, the gravity reflux hydrogen storage and supply device includes a hydrogen recovery device 800, which is connected to the top of each water storage tank 300. When the water in the hydrogen storage tank 200 flows back into the water storage tank 300 under the action of gravity, the hydrogen recovery device 800 can recover the hydrogen in the water storage tank 300.

[0114] It should be understood that during gas supply, the water in the water storage tank 300 is transferred to the hydrogen storage tank 200, which is filled with hydrogen. The water forces the hydrogen in the hydrogen storage tank 200 to the storage pipeline 100 for supply to the hydrogen-using equipment 20. During this process, a small amount of hydrogen dissolves in the water. When the water containing this dissolved hydrogen flows back to the water storage tank 300, the hydrogen recovery device 800 can recover this hydrogen from the water, reducing hydrogen waste and helping to maintain a constant pressure within the water storage tank 300, thus ensuring the safety of the device operation.

[0115] See Figure 6 In one embodiment, the hydrogen recovery device 800 includes an airbag 810, which is connected to the top of each water storage tank 300. By connecting the airbag 810 to the top of each water storage tank 300, hydrogen gas released from the tank can be recovered. The gas recovered by the airbag 810 can then be recycled in a downstream gas processing device. This not only reduces hydrogen waste but also helps maintain a constant pressure within the water storage tank 300, ensuring the safety of the device.

[0116] Alternatively, in other embodiments, the hydrogen recovery device 800 may include a gas-liquid separator, the inlet of which is connected to the bottom of the hydrogen storage tank 200, the liquid outlet of which is connected to the water storage tank 300, and the gas outlet of which can be connected to an external hydrogen storage structure or a hydrogen utilization structure, which can be configured according to actual needs.

[0117] Alternatively, in other embodiments, the hydrogen recovery device 800 may include a gas-liquid separator and an air bag, with the gas outlet of the gas-liquid separator connected to the air bag, which can be configured according to actual needs.

[0118] See Figures 2 to 8 The gravity reflux hydrogen storage and supply system of this utility model embodiment can operate in the following four modes. In the accompanying drawings, the purple-red lines with arrows represent hydrogen flow, the green lines with arrows represent water flow, and the yellow dashed lines represent control signals.

[0119] 1. When renewable power is sufficient, the system enters the charging phase.

[0120] like Figure 2As shown, taking a system comprising four hydrogen storage tanks 200 and two water storage tanks 300 as an example. The four hydrogen storage tanks are designated 200A, 200B, 200C, and 200D, and all four are empty. The two water storage tanks are designated 300A and 300B, and both are pre-filled with water.

[0121] When renewable electricity is abundant and the water electrolysis hydrogen production equipment 10 is operating at full load (with a large number of electrolyzers running) or at a high load, the hydrogen produced exceeds the downstream hydrogen consumption flow. At this time, in addition to being directly supplied to the hydrogen consumption equipment 20 through the hydrogen consumption pipeline 30, the excess hydrogen produced by the water electrolysis hydrogen production equipment 10 will be stored in each hydrogen storage tank 200 through the storage pipeline 100, that is, the system enters the gas filling stage.

[0122] At this time, the hydrogen regulating valve 110 and the gas phase valve 211 of the hydrogen storage tank 200A are opened, and excess hydrogen will be introduced into the hydrogen storage tank 200A through the hydrogen regulating valve 110. The opening degree of the hydrogen regulating valve 110 is related to the temperature of the hydrogen storage tank 200A to ensure that the hydrogen temperature in the hydrogen storage tank 200A is within a reasonable range. Furthermore, if the temperature change exceeds the reasonable range, the system can open the gas phase valve 211 of the adjacent hydrogen storage tank 200B to simultaneously introduce hydrogen into both hydrogen storage tanks 200A and 200B, ensuring that the hydrogen temperature in each hydrogen storage tank 200A is within a reasonable range. Specifically, as follows... Figure 3 As shown.

[0123] The hydrogen regulating valve 110 is also pressure-interlocked with the hydrogen storage tank 200A. When the pressure of the hydrogen storage tank 200A approaches the pipeline pressure (the difference between the two does not exceed 0.05 MPa), the hydrogen regulating valve 110 fully opens and disconnects from the pressure of the hydrogen storage tank 200A, while simultaneously closing the gas phase valve 211 of the hydrogen storage tank 200A. At this point, the filling of the hydrogen storage tank 200A is completed. Simultaneously, the system can automatically switch to the next hydrogen storage tank 200 to be filled based on the pressure interlock of each hydrogen storage tank 200, until all hydrogen storage tanks 200 are fully filled.

[0124] 2. When downstream hydrogen-using equipment is under maintenance, the system enters the gas charging stage.

[0125] like Figure 4 As shown, taking a system comprising four hydrogen storage tanks 200 and two water storage tanks 300 as an example. The four hydrogen storage tanks are designated 200A, 200B, 200C, and 200D, and all four are empty. The two water storage tanks are designated 300A and 300B, and both are pre-filled with water.

[0126] When the downstream hydrogen-using equipment 20 is under maintenance, it does not require hydrogen, and the hydrogen pipeline 30 is not in use. The hydrogen produced by the hydrogen production equipment 10 will then be stored in each hydrogen storage tank 200 via the storage pipeline 100, and the system will enter the filling stage.

[0127] It should be noted that the filling process for each hydrogen storage tank 200 can refer to the filling process under the first working condition mentioned above, and will not be repeated here.

[0128] 3. When renewable electricity is insufficient, the system enters the gas supply phase.

[0129] like Figure 5 As shown, taking a system comprising four hydrogen storage tanks 200 and two water storage tanks 300 as an example. The four hydrogen storage tanks are designated 200A, 200B, 200C, and 200D, and all four are filled with hydrogen. The two water storage tanks are designated 300A and 300B, and both are pre-stored with water.

[0130] When renewable power is interrupted or at low load, the water electrolysis hydrogen production equipment 10 operates at a corresponding low load (reducing the number of electrolyzers) or stops working, and the amount of hydrogen produced by the hydrogen production equipment 10 is lower than the downstream hydrogen consumption. At this time, all the hydrogen produced by the water electrolysis hydrogen production equipment 10 is directly supplied to the hydrogen consumption equipment 20 through the hydrogen consumption pipeline 30, and the insufficient hydrogen is supplemented by the hydrogen in each hydrogen storage tank 200, that is, the system enters the gas supply stage.

[0131] See Figure 5 When venting begins, the system automatically starts the power mechanism 600, such as a common water pump 610; the following description uses the water pump 610. The gas phase valve 211 of the hydrogen storage tank 200A is opened, as are the outlet valve 311 of the water storage tank 300A and the inlet valve 211 of the hydrogen storage tank 200A. Water from the water storage tank 300A can then enter the hydrogen storage tank 200A through the first connecting pipe 400 between the water storage tank 300A and the hydrogen storage tank 200A. As the liquid level in the water storage tank 300A gradually decreases to zero while the liquid level in the hydrogen storage tank 200A gradually increases from zero to near full, the water in the water storage tank 300A is completely transferred to the hydrogen storage tank 200A. The hydrogen in the hydrogen storage tank 200A is completely vented to the storage pipeline 100 and supplied to the hydrogen-using equipment 20. Venting of the hydrogen storage tank 200A is then complete. Meanwhile, the system can automatically switch the exhaust according to the liquid level change of hydrogen storage tank 200A, that is, stop the exhaust of hydrogen storage tank 200A and switch to the exhaust of hydrogen storage tank 200B.

[0132] See Figure 6After the hydrogen storage tank 200A is vented, the gas phase valve 211 of the hydrogen storage tank 200A is closed, and the gas phase valve 211 of the hydrogen storage tank 200B is opened. Simultaneously, the drain valve 231 of the hydrogen storage tank 200A, the return valve 321 of the water storage tank 300A, the outlet valve 311 of the water storage tank 300B, and the inlet valve 221 of the hydrogen storage tank 200B are opened. Then, under the influence of gravity and the expansion of residual gas in the clearance volume (gas pressure close to the venting pressure), the water in the hydrogen storage tank 200A can enter the water storage tank 300A through the second connecting pipe 500. When the liquid level in the hydrogen storage tank 200A gradually decreases to zero while the liquid level in the water storage tank 300A gradually increases from zero to near full level, the water in the hydrogen storage tank 200A is completely transferred to the water storage tank 300A.

[0133] Simultaneously, water from water tank 300B can enter hydrogen storage tank 200B via the first connecting pipe 400 between water tank 300B and hydrogen storage tank 200B. When the liquid level in water tank 300B gradually decreases to zero while the liquid level in hydrogen storage tank 200B gradually increases from zero to near full, the water in water tank 300B is completely transferred to hydrogen storage tank 200B, and the hydrogen in hydrogen storage tank 200B is completely discharged to storage pipeline 100 to supply hydrogen-using equipment 20, thus ending the venting process in hydrogen storage tank 200B. The system can also automatically switch venting based on changes in the liquid level of hydrogen storage tank 200B, i.e., stopping venting from hydrogen storage tank 200B and switching to venting from hydrogen storage tank 200C.

[0134] The return water of water storage tank 300A and the outlet water of water storage tank 300B are carried out simultaneously. The return water time of water storage tank 300A and the outlet water time of water storage tank 300B can be ensured to be consistent by setting the height difference and clearance volume of hydrogen storage tank 200 and water storage tank 300 and by adjusting the frequency of water pump 610.

[0135] See Figure 7After the hydrogen storage tank 200B is vented, the gas phase valve 211 of the hydrogen storage tank 200B is closed, and the gas phase valve 211 of the hydrogen storage tank 200C is opened. Simultaneously, the drain valve 231 of the hydrogen storage tank 200B, the return valve 321 of the water storage tank 300B, the outlet valve 311 of the water storage tank 300A, and the inlet valve 221 of the hydrogen storage tank 200C are opened. Then, under the influence of gravity and the expansion of residual gas in the clearance volume (gas pressure close to the venting pressure), the water in the hydrogen storage tank 200B can enter the water storage tank 300B through the second connecting pipe 500. When the liquid level in the hydrogen storage tank 200B gradually decreases to zero while the liquid level in the water storage tank 300B gradually increases from zero to near full level, the water in the hydrogen storage tank 200B is completely transferred to the water storage tank 300B. Meanwhile, water from storage tank 300A can enter hydrogen storage tank 200C via the first connecting pipe 400 under the action of water pump 610, causing the hydrogen in hydrogen storage tank 200C to be discharged. In this cycle, hydrogen from multiple hydrogen storage tanks 200 can be supplied to hydrogen-using equipment 20 in sequence.

[0136] The return water of water storage tank 300B and the outlet water of water storage tank 300A are carried out simultaneously. The return water time of water storage tank 300B and the outlet water time of water storage tank 300A can be ensured by setting the height difference and clearance volume of hydrogen storage tank 200 and water storage tank 300 and by adjusting the frequency of water pump 610.

[0137] 4. When there is no renewable electricity available, the system enters the gas supply phase.

[0138] like Figure 8 As shown, taking a system comprising four hydrogen storage tanks 200 and two water storage tanks 300 as an example. The four hydrogen storage tanks are designated 200A, 200B, 200C, and 200D, and all four are filled with hydrogen. The two water storage tanks are designated 300A and 300B, and both are pre-stored with water.

[0139] When renewable electricity is unavailable, the water electrolysis hydrogen production equipment 10 stops working, and the hydrogen pipeline 30 is not used. Furthermore, all the hydrogen required by the hydrogen production equipment 20 is replenished by the hydrogen in each hydrogen storage tank 200, i.e., the system enters the gas supply phase.

[0140] It should be noted that the process of multiple hydrogen storage tanks 200 supplying gas to the outside in sequence can refer to the gas supply process under the third working condition mentioned above, and will not be repeated here.

[0141] The following hydrogen-using equipment requires a continuous hydrogen supply of 50,000 NM for operation. 3 The following is a detailed explanation using / h as an example.

[0142] Assume that downstream hydrogen-using equipment 20 is used in methanol synthesis. Typically, green methanol synthesis requires a continuous supply of 50,000 NM.3 The hydrogen production equipment (hydrogen per hour) via water electrolysis has a maximum capacity of 150,000 NM. 3 / h, the electrolysis water hydrogen production equipment can meet the methanol plant's demand by working a total of 8 hours per day.

[0143] For ease of understanding, assume that the water electrolysis hydrogen production equipment 10 operates at full capacity for 8 hours a day and is shut down for the remaining 16 hours. During the shutdown period of the water electrolysis hydrogen production equipment 10, the hydrogen required for methanol synthesis is supplied by multiple hydrogen storage tanks 200.

[0144] For example, the hydrogen produced by the water electrolysis hydrogen production equipment 10 has a hydrogen pressure of 1.6 MPa. After the water electrolysis hydrogen production equipment 10 starts working, its hourly hydrogen storage capacity is 150,000 NM. 3 / h-50000NM 3 / h=100000NM 3 / h, hydrogen storage time 8h, hydrogen release time 16h, methanol synthesis plant operates continuously for 24 hours.

[0145] It is understandable that the total hydrogen storage capacity of the water electrolysis hydrogen production equipment operating for 8 hours a day is 800,000 NM. 3 / h (volume flow rate 57328m³) 3 If / h), then 2000m is required. 3 29 hydrogen storage tanks with a pressure of 1.6 MPa. During the 16 hours that the water electrolysis hydrogen production equipment 10 is not in operation, hydrogen will be supplied by these 29 hydrogen storage tanks 200.

[0146] like Figure 5 As shown, under gas supply conditions, water storage tanks 300A and 300B are filled with water, and the top gas phase pressure is 1.45 MPa. Each hydrogen storage tank 200 is filled with hydrogen at a pressure of 1.6 MPa and a temperature of 40°C. 50,000 Nm³ of hydrogen needs to be supplied. 3 / h hydrogen (volume flow rate 3583m³) 3 / h) is discharged into the pipeline network.

[0147] When venting begins, the water in storage tank 300A (flow rate 3583 m³ / h) 3 The hydrogen gas is completely transferred to hydrogen storage tank 200A at a time, and the hydrogen gas in hydrogen storage tank 200A is discharged. When the venting of hydrogen storage tank 200A is completed, the hydrogen pressure at the top of its tank gradually decreases to 0.1 MPa.

[0148] Calculations show that the effective hydrogen storage rate of each hydrogen storage tank 200 is 93.1%. The shaft power of water pump 610 is 1997 kW, and the power consumption for 16 hours a day is 16h × 1997 kW = 31952 kWh. Compared with the traditional method of using a hydrogen compressor for gas storage and supply, the power consumption of the gravity reflux hydrogen storage and supply device and system of this application is greatly reduced.

[0149] The gravity-fed reflux hydrogen storage and supply device and system in this embodiment utilizes the hydrogen pressure of the hydrogen production equipment to fill each hydrogen storage tank. The system employs a power mechanism and uses water as the driving medium to sequentially supply hydrogen from multiple storage tanks. Therefore, the storage and supply process of this device eliminates the need for expensive hydrogen compressors, resulting in better safety, lower power consumption, higher reliability, and significantly reduced costs. Furthermore, the hydrogen residue in each filling and discharging process is small, leading to higher utilization of the hydrogen storage tanks and saving on investment costs.

[0150] The gravity-fed reflux hydrogen storage and supply device and system in this embodiment of the invention, by setting the height difference between each water tank and the hydrogen storage tank and the internal clearance volume, allows the water in the water tank to be completely transferred to the hydrogen storage tank, resulting in the complete discharge of hydrogen from the hydrogen storage tank. The water in the hydrogen storage tank can then automatically flow back to the water tank under the influence of gravity and the expansion of residual gas in the clearance volume of the hydrogen storage tank. This effectively reduces the complexity of the pipeline and the difficulty of control, reduces the system's operating energy consumption, and improves the system's economic efficiency. Furthermore, while the water in the hydrogen storage tank is flowing back to one water tank, water from another water tank can be supplied to another hydrogen storage tank to achieve gas supply, thereby effectively improving the continuity of the system's gas supply process, saving process time, and increasing system operating efficiency.

[0151] The gravity reflux hydrogen storage and supply device and system in this embodiment of the invention, by setting the height difference between the water tank and the hydrogen storage tank, and / or designing the clearance volume inside the hydrogen storage tank, as well as adjusting the frequency conversion of the water pump and the flow rate of the first and second connecting pipes, can make the water return time of one water tank consistent with the water outlet time of the other water tank, thereby effectively improving the continuity of the system's gas supply process, saving process time, and improving the system's operating efficiency.

[0152] The gravity reflux hydrogen storage and supply device and system in this embodiment of the invention connects each water tank and each hydrogen storage tank via pipelines. Water in the water tanks can flow to the hydrogen storage tanks through a first connecting pipeline, and water in the hydrogen storage tanks can flow back to the water tanks through a second connecting pipeline. Because the water operates within a closed pipeline, it does not come into contact with air, effectively preventing corrosion of the inner walls of the water tanks and hydrogen storage tanks, and effectively extending the service life of the tanks.

[0153] The gravity reflux hydrogen storage and supply device and system in this embodiment of the utility model can achieve the purpose of venting multiple hydrogen storage tanks outward sequentially through two water storage tanks during gas supply, thereby reducing the system footprint and lowering the investment cost of water storage tanks.

[0154] The gravity reflux hydrogen storage and supply device and system in this embodiment of the invention, by setting up hydrogen regulating valves to control the flow rate of hydrogen entering each hydrogen storage tank according to the hydrogen temperature in each tank, can effectively control the temperature changes of hydrogen in the storage tanks, ensuring that the hydrogen temperature in the storage tanks is maintained within a reasonable range. This avoids the phenomenon that the temperature rise and fall of hydrogen in the storage tanks threatens the safe operation of the hydrogen storage tanks and reduces the hydrogen storage efficiency. Furthermore, by controlling the temperature fluctuation of the hydrogen storage tanks within a small range, the pressure fluctuation within the hydrogen storage tanks can be minimized, thereby improving the utilization rate of the hydrogen storage tanks.

[0155] The gravity reflux hydrogen storage and supply device and system in this embodiment of the utility model can heat the water entering the hydrogen storage tank and water storage tank by setting a heating device, so as to avoid the situation that the inner wall of the hydrogen storage tank and water storage tank is prone to freezing when storing water in low temperature environment, thereby expanding the application range of the system.

[0156] The gravity reflux hydrogen storage and supply device and system in this embodiment of the invention can recover hydrogen dissolved in water in the storage tank by setting up a hydrogen recovery device. This not only reduces hydrogen waste, but also helps maintain a constant pressure in the storage tank and ensures the safety of the device.

[0157] The above embodiments are merely illustrative examples of structures. The structures in each embodiment are not fixed combinations. In the absence of structural conflicts, the structures in multiple embodiments can be arbitrarily combined and used.

[0158] Although the present invention has been described with reference to several typical embodiments, it should be understood that the terminology used is descriptive and exemplary, and not restrictive. Since the present invention can be embodied in many forms without departing from the spirit or essence of the invention, it should be understood that the above embodiments are not limited to any of the foregoing details, but should be interpreted broadly within the spirit and scope defined by the appended claims. Therefore, all variations and modifications falling within the scope of the claims or their equivalents should be covered by the appended claims.

Claims

1. A gravity reflux hydrogen storage and supply device, characterized in that, include: Storage pipelines are used to connect to hydrogen production equipment to receive hydrogen gas; Multiple hydrogen storage tanks are connected in parallel downstream of the hydrogen production equipment, and the storage pipeline can input the received hydrogen into each of the hydrogen storage tanks for storage. At least two water storage tanks, each of which is lower than the hydrogen storage tank in the direction of gravity, and each water storage tank is connected to the hydrogen storage tank through a first connecting pipe and a second connecting pipe respectively; A power mechanism is provided between the water storage tank and the hydrogen storage tank. The power mechanism can transfer water in the water storage tank to the hydrogen storage tank through the first connecting pipeline, so that the hydrogen storage tank can supply hydrogen to the outside. After the hydrogen storage tank finishes supplying gas, the water in the hydrogen storage tank can flow back to the water storage tank through the second connecting pipe under the action of gravity. At the same time, the water in the next water storage tank can enter the next hydrogen storage tank through the first connecting pipe under the action of the power mechanism.

2. The gravity reflux hydrogen storage and supply device according to claim 1, characterized in that, The time when water is returned from any of the hydrogen storage tanks to any of the water storage tanks coincides with the time when water is introduced from one of the water storage tanks to another hydrogen storage tank.

3. The gravity reflux hydrogen storage and supply device according to claim 2, characterized in that, The power mechanism includes a water pump and a speed regulator. The speed regulator is electrically connected to the water pump. The speed regulator can control the operation of the water pump according to the pipeline pressure of the storage pipeline and the liquid level in each of the hydrogen storage tanks and the liquid level in each of the water storage tanks, so as to adjust the flow rate of the first connecting pipeline.

4. The gravity reflux hydrogen storage and supply device according to claim 1, characterized in that, Each of the hydrogen storage tanks is provided with a water inlet at the bottom, and each of the water storage tanks is provided with a water outlet at the bottom. The two ends of each of the first connecting pipes are respectively connected to the water inlet and the water outlet. The inlet is equipped with an inlet valve, and the outlet is equipped with an outlet valve.

5. The gravity reflux hydrogen storage and supply device according to claim 4, characterized in that, The inlet valve is a flow regulating valve, which is used to control the flow rate of water entering the hydrogen storage tank according to the pipeline pressure of the storage pipeline and the liquid level in the hydrogen storage tank.

6. The gravity reflux hydrogen storage and supply device according to claim 1, characterized in that, Each of the hydrogen storage tanks is provided with a drain outlet at the bottom, and each of the water storage tanks is provided with a return water outlet on the side. The two ends of each of the second connecting pipes are respectively connected to the drain outlet and the return water outlet. A drain valve is provided at the drain outlet, and a return valve is provided at the return outlet.

7. The gravity reflux hydrogen storage and supply device according to any one of claims 1 to 6, characterized in that, The device includes a heating device installed on the pipeline connecting the water storage tank and the hydrogen storage tank. The heating device is used to heat the water entering the hydrogen storage tank and the water storage tank.

8. The gravity reflux hydrogen storage and supply device according to claim 7, characterized in that, The heating device is a heat exchanger, and the heat of the heating device comes from the combustion heat of the hydrogen produced by the hydrogen production equipment. Alternatively, the heating device may be an electric heater capable of directly heating using renewable electricity.

9. The gravity reflux hydrogen storage and supply device according to any one of claims 1 to 6, characterized in that, The device includes a hydrogen recovery unit, which is connected to the top of each of the water storage tanks. When water in the hydrogen storage tank flows back into the water storage tank under the action of gravity, the hydrogen recovery unit can recover the hydrogen in the water storage tank.

10. The gravity reflux hydrogen storage and supply device according to claim 9, characterized in that, The hydrogen recovery device includes an air bladder, which is connected to the top of each of the water storage tanks.

11. The gravity reflux hydrogen storage and supply device according to any one of claims 1 to 6, characterized in that, Each of the hydrogen storage tanks is connected to a gas phase pipeline at its top, and each gas phase pipeline is connected to the storage pipeline. Each gas phase pipeline is equipped with a gas phase valve.

12. The gravity reflux hydrogen storage and supply device according to any one of claims 1 to 6, characterized in that, The system includes a hydrogen regulating valve, which is installed on the storage pipeline and is used to control the flow rate of hydrogen entering each of the hydrogen storage tanks according to the hydrogen temperature in each of the hydrogen storage tanks.

13. A gravity reflux hydrogen storage and supply system, characterized in that, The invention includes a hydrogen production device and a gravity reflux hydrogen storage and supply device as described in any one of claims 1-12, wherein the storage pipeline is connected to the outlet end of the hydrogen production device. The outlet of the hydrogen production equipment is also connected to a hydrogen use pipeline. The hydrogen use pipeline is arranged in parallel with the storage pipeline, and the hydrogen supplied by each of the hydrogen storage tanks can flow into the hydrogen use pipeline.

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