Gravity backflow type hydrogen storage and supply device and system

Abstract

The invention relates to a gravity backflow type hydrogen storage and supply device and system. The device comprises a storage pipeline, a plurality of hydrogen storage tanks, at least two water storage tanks and a power mechanism. And the storage pipeline is used for storing hydrogen produced by the hydrogen production equipment into the hydrogen storage tank. Each water storage tank is lower than each hydrogen storage tank in the gravity direction, and each water storage tank is communicated with each hydrogen storage tank through a first connecting pipeline and a second connecting pipeline. The power mechanism is arranged between the water storage tank and the hydrogen storage tank and 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 provide hydrogen outwards. After the hydrogen storage tank supplies gas outwards, water in the hydrogen storage tank can flow back into the water storage tank through the second connecting pipeline under the action of gravity, and meanwhile water in the next water storage tank can enter the next hydrogen storage tank through the first connecting pipeline under the action of the power mechanism. The device is low in power consumption, low in cost, high in safety and good in operation economy.

Description

Technical Field

[0001] The present invention relates to the technical field of hydrogen storage and supply, and in particular to a gravity reflux hydrogen storage and supply device and system. Background Art

[0002] For situations where hydrogen is used as a raw material (such as in the production of green liquid fuel and pipeline hydrogen), direct hydrogen storage is the most economical and effective method. A hydrogen storage and transportation system must be built. When renewable electricity is sufficient, multiple electrolyzers are used to accelerate the production and storage of hydrogen. The stored hydrogen can then be transported out when the renewable electricity output decreases or stops.

[0003] Existing hydrogen storage methods include compressed hydrogen storage, liquid hydrogen storage, organic liquid storage, metal hydrogen storage and other methods. Among them, the most commonly used is compressed hydrogen storage, that is, the hydrogen produced by electrolysis of water is compressed by a compressor (or directly enters the storage tank without compression at a pressure of 1.6MPa-3.0MPa after electrolysis of water) and then enters the hydrogen storage tank. The hydrogen in the storage tank is released when the hydrogen is needed. Since the storage tank pressure changes during the hydrogen storage and dehydrogenation process, the hydrogen pressure in the storage tank must be compressed by a compressor when it is lower than the hydrogen use pressure. In order to release the hydrogen in the storage tank as much as possible, the compressor inlet pressure is reduced, resulting in a large power consumption of the hydrogen compressor. Due to the disadvantages of hydrogen being difficult to compress, having a small molecular weight and easy to leak, a wide explosion range, poor safety and hydrogen embrittlement, the existing compressed hydrogen storage devices require large investments, high energy consumption and poor safety.

[0004] Therefore, there is an urgent need for a hydrogen storage and supply system with low power consumption, low cost and high safety. Summary of the Invention

[0005] One object of the present invention is to address the deficiencies in the prior art and to provide a gravity reflux hydrogen storage and supply device. To solve the above technical problems, the present invention adopts the following technical solutions:

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

[0007] a storage pipeline for connecting to a hydrogen production device to receive hydrogen;

[0008] A plurality of hydrogen storage tanks are arranged in parallel downstream of the hydrogen production equipment, and a storage pipeline is capable of inputting the received hydrogen into each hydrogen storage tank for storage;

[0009] At least two water 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 through a first connecting pipeline and a second connecting pipeline respectively;

[0010] a power mechanism disposed between the water storage tank and the hydrogen storage tank, the power mechanism being capable of transferring water in the water storage tank to the hydrogen storage tank via the first connecting pipe, so that the hydrogen storage tank can provide hydrogen to the outside;

[0011] When the hydrogen storage tank has completed gas supply to the outside, 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 when any hydrogen storage tank returns water to any water storage tank is consistent with the time when another water storage tank feeds water to another hydrogen storage tank.

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

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

[0015] A water inlet valve is provided at the water inlet, and a water outlet valve is provided at the water outlet.

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

[0017] In one embodiment, a drain port is provided at the bottom of each hydrogen storage tank, a water return port is provided at the side of each water storage tank, and both ends of each second connecting pipe are connected to the drain port and the water return port respectively;

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

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

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

[0021] Alternatively, the heating device is an electric heater, which can directly perform electrical heating using renewable electricity.

[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 air bag connected to the top of each water storage tank.

[0024] In one embodiment, the top of each hydrogen storage tank is connected to a gas phase pipeline, each gas phase pipeline is connected to the storage pipeline, and each gas phase pipeline is provided with a gas phase valve.

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

[0026] Another object of the present invention is to provide a gravity reflux hydrogen storage and supply system, comprising a hydrogen production equipment and any one of the gravity reflux hydrogen storage and supply devices described above, wherein the storage pipeline is connected to the outlet end of the hydrogen production equipment;

[0027] The outlet end of the hydrogen production equipment is also connected to a hydrogen pipeline, which is arranged in parallel with the storage pipeline. The hydrogen provided to the outside by each hydrogen storage tank can be collected into the hydrogen pipeline.

[0028] It can be seen from the above technical solutions that the present invention has at least the following advantages and positive effects:

[0029] In the present invention, the gravity reflux hydrogen storage and gas supply device includes a storage pipeline, multiple hydrogen storage tanks and at least two water storage tanks, and a power mechanism. The storage pipeline is used to store the hydrogen produced by the hydrogen production equipment in the hydrogen storage tank. 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 arranged between the water storage tank and the hydrogen storage tank, and can transfer the water in the water storage tank to the hydrogen storage tank via the first connecting pipeline, so that the hydrogen storage tank can provide hydrogen to the outside. After the hydrogen storage tank completes the gas supply to the outside, the water in the hydrogen storage tank can flow back to the water storage tank via the second connecting pipeline under the action of gravity, and at the same time, the water in 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] The gravity backflow type hydrogen storage and gas supply device can utilize the hydrogen pressure of the hydrogen production equipment to inflate each hydrogen storage tank, and the system uses a power mechanism as the power to realize the purpose of sequentially supplying gas from the hydrogen storage tanks to the outside by using water as the driving medium. Therefore, the gas storage and gas supply process of the device does not need to use a hydrogen compressor with high cost, and the safety is better, the power consumption is lower, the reliability is higher, and the cost is greatly reduced. Moreover, the hydrogen residual amount of the hydrogen storage tank is small in each inflation and deflation process, so that the utilization rate of the hydrogen storage tank is higher, and the investment cost of the hydrogen storage tank is saved.

[0031] In addition, by setting each water storage tank to be lower than the hydrogen storage tank, when the water in the water storage tank is completely transferred to the hydrogen storage tank to make the hydrogen in the hydrogen storage tank completely discharged, the water in the hydrogen storage tank can automatically flow back to the water storage tank under the action of gravity, thereby effectively reducing the complexity and control difficulty of the pipeline, reducing the operation energy consumption of the system, and improving the economy of the system operation. When the water in the hydrogen storage tank flows back to one water storage tank, the water in the other water storage tank can flow to another hydrogen storage tank to realize gas supply, so that the continuity of the system gas supply process can be effectively improved, the process flow time can be saved, and the gas supply efficiency can be improved. BRIEF DESCRIPTION OF DRAWINGS

[0032] Figure 1 is a structural schematic diagram of a gravity backflow type hydrogen storage and gas supply system according to an embodiment of the present application.

[0033] Figure 2 is Figure 1 a flowchart of the inflation stage of the system shown in FIG. 1 when the hydrogen production equipment produces a large amount of hydrogen. Figure 1 .

[0034] Figure 3 is Figure 1 a flowchart of the inflation stage of the system shown in FIG. 1 when the hydrogen production equipment produces a large amount of hydrogen. Figure 2 .

[0035] Figure 4 is Figure 1 a flowchart of the inflation stage of the system shown in FIG. 1 when the hydrogen production equipment does not need to use hydrogen.

[0036] Figure 5 is Figure 1 a flowchart of the gas supply stage of the system shown in FIG. 1 when the hydrogen production equipment produces insufficient hydrogen. Figure 1 .

[0037] Figure 6 is Figure 1 a flowchart of the gas supply stage of the system shown in FIG. 1 when the hydrogen production equipment produces insufficient hydrogen. Figure 2 .

[0038] Figure 7 is Figure 1The system shown is a schematic diagram of the gas supply phase when the hydrogen production equipment produces insufficient hydrogen. Figure 3 .

[0039] Figure 8 yes Figure 1 The flow chart of the system shown is a schematic diagram of the gas supply stage when the hydrogen production equipment stops working.

[0040] The following are the descriptions of the reference numerals:

[0041] 10-Hydrogen production equipment; 20-Hydrogen use equipment; 30-Hydrogen pipeline;

[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 pipeline; 500-second connecting pipeline;

[0046] 600-power mechanism; 610-water pump; 620-speed regulator;

[0047] 700-Heating device; 800-Hydrogen recovery device; 810-Airbag. DETAILED DESCRIPTION

[0048] Typical embodiments embodying the features and advantages of the present invention are described in detail in the following description. It should be understood that the present invention is capable of various variations in different embodiments without departing from the scope of the present invention, and that the descriptions and illustrations herein are intended to be illustrative rather than limiting.

[0049] In the description of this application, it should be understood that in the embodiments shown in the drawings, indications of directions 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 devices or elements referred to must have a specific orientation, be constructed, or operate in a specific orientation. These descriptions are appropriate when these elements are in the positions shown in the drawings. If the descriptions of the positions of these elements change, the indications of these directions will 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 the technical features being referred to. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the described features. Throughout the description of this application, "plurality" means two or more, unless otherwise specifically defined.

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

[0052] The number of hydrogen production equipment 10 can be one or more. When there are more than one hydrogen production equipment 10, the multiple hydrogen production equipment 10 are arranged in parallel.

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

[0054] like Figure 1 As shown, the gravity reflux hydrogen storage and supply apparatus includes a storage pipeline 100 connected to the outlet of the hydrogen production equipment 10. The storage pipeline 100 and the hydrogen supply pipeline 30 are arranged in parallel. Therefore, the storage pipeline 100 and the hydrogen supply 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 tanks 200. For example, when the hydrogen produced by the hydrogen production equipment 10 exceeds the hydrogen consumption of the downstream hydrogen consumption equipment 20, the excess hydrogen can be transported via the storage pipeline 100 to the hydrogen storage tanks 200 for storage, indicating that the system enters the charging stage.

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

[0057] The following is a detailed description of the specific embodiments of the gravity reflux hydrogen storage and supply device of the present application with reference to the accompanying drawings.

[0058] See also Figure 1 As shown, the gravity reflux hydrogen storage and supply device according to an embodiment of the present invention includes a storage pipeline 100 , a plurality of hydrogen storage tanks 200 , 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 the hydrogen storage tanks 200 so that the hydrogen in the hydrogen storage tanks 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 body 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 deliver hydrogen to each hydrogen storage tank 200 through the storage pipeline 100.

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

[0063] like Figure 1 As shown, each gas phase pipeline 210 is provided with a gas phase valve 211. The gas phase valve 211 can be a two-way conducting 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 to allow the hydrogen produced by the hydrogen production equipment 10 to enter the hydrogen storage tank 200. When the hydrogen storage tank 200 needs to supply gas to the outside, the gas phase valve 211 on the gas phase pipeline 210 is opened to allow the hydrogen in the hydrogen storage tank 200 to be supplied to the outside.

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

[0065] Specifically, when the temperature change of hydrogen in the hydrogen storage tank 200 exceeds a reasonable range, the hydrogen regulating valve 110 can adjust its own 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 hydrogen temperature in the hydrogen storage tank 200 is maintained within a reasonable range.

[0066] Optionally, in some embodiments, when the temperature of the hydrogen in the hydrogen storage tank 200 changes beyond a reasonable range, the system can open the gas phase valve 211 of the adjacent hydrogen storage tank 200. Thus, the system can simultaneously charge hydrogen into multiple hydrogen storage tanks 200 to reduce the rise in hydrogen temperature.

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

[0068] Therefore, in the embodiment of the present invention, the hydrogen temperature in the hydrogen storage tank 200 can be maintained within a reasonable range through the regulation of the hydrogen regulating valve 110 or by opening the gas phase valve 211 of the adjacent hydrogen storage tank 200. For example, the temperature of the hydrogen in the hydrogen storage tank 200 is maintained within a range of no more than 50°C to 60°C.

[0069] See also 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 body of other shapes.

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

[0071] See also Figure 5 and Figure 6 In the embodiment of the present invention, the first connecting pipe 400 is used to supply water from the water storage tank 300 to the hydrogen storage tank 200, and the second connecting pipe 500 is used to return water from the hydrogen storage tank 200 to the water storage tank 300. Details will be described below. It is understood that in other embodiments, the functions of the first connecting pipe 400 and the second connecting pipe 500 may be interchanged.

[0072] like Figure 1 As shown, the power mechanism 600 is arranged between the water storage tank 300 and the hydrogen storage tank 200. The power mechanism 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 provide it to the downstream hydrogen-using equipment 20.

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

[0074] Therefore, in the gravity reflux hydrogen storage and supply device of the present invention, the hydrogen storage tank 200 can be switched back and forth between the empty, water storage or hydrogen storage states, and the water storage tank 300 can be switched back and forth between the water storage or empty states, thereby realizing the storage of hydrogen or the external supply of hydrogen.

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

[0076] It should be noted that in the embodiments of the present invention, the pressure of the hydrogen produced by the hydrogen production equipment 10 can be 1.6 MPa or higher. Consequently, 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 operating pressure of the power mechanism 600 can be no less than 1.6 MPa. This ensures that the entire system maintains pressure balance during operation.

[0077] It will be appreciated that when the hydrogen pressure required by the hydrogen-consuming device 20 is 1.6 MPa, the hydrogen provided by the hydrogen-generating device 10 in the system of the present invention via the hydrogen-consuming pipeline 20 and the storage pipeline 100 can meet the pressure requirement of the hydrogen-consuming device 20. If the hydrogen pressure required by the hydrogen-consuming device 20 is greater than the pressure of the hydrogen produced by the hydrogen-generating device 10, pressurizing equipment can be installed on the hydrogen-consuming pipeline 20 and the storage pipeline 100 to increase the hydrogen pressure to the required level. The specific setting can be determined based on actual needs.

[0078] In the present invention, after the hydrogen storage tank 200 has finished supplying gas to the outside, the water in 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 is based on an example in which the device includes two water storage tanks 300A and 300B.

[0079] For example, refer to Figure 5 and Figure 6 As shown, when the water in water tank 300A enters hydrogen tank 200A and pushes the hydrogen outward, completely discharging the hydrogen from hydrogen tank 200A, hydrogen tank 200A is filled with water, while water tank 300A becomes empty. Because water tank 300A is lower than hydrogen tank 200A in the direction of gravity, the water in hydrogen tank 200A can flow back into water tank 300A through second connecting pipe 500 under the action of gravity.

[0080] In the present invention, a second connecting pipe 500 is provided to connect the hydrogen storage tank 200 and the water storage tank 300, and a height difference is made between the hydrogen storage tank 200 and the water storage tank 300 so that the water in the hydrogen storage tank 200 can automatically return to the water storage tank 300, thereby effectively reducing the complexity and control difficulty of the pipeline, reducing the operating energy consumption of the system, and improving the economy of the system operation.

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

[0082] In the present invention, while the water in the hydrogen storage tank 200 flows back to the water storage tank 300, the water in the next water storage tank 300 can enter the next hydrogen storage tank 200 through the first connecting pipe 400 under the action of the power mechanism 600. 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 tank 200B through the first connecting pipe 400 under the action of the power mechanism 600.

[0083] In other words, in the present invention, the return of water from any one water tank 300 and the discharge of water from another water tank 300 are carried out simultaneously, thereby effectively improving the continuity of the system gas supply process and saving process time.

[0084] Optionally, the return time of any one water tank 300 is set to be equal to the water discharge time of another water tank 300. That is, the time it takes for any hydrogen storage tank 200 to return water to any other water tank 300 coincides with the time it takes for another water tank 300 to supply water to another hydrogen storage tank 200. This effectively improves the continuity of the system's gas supply process, saves process time, and enhances system operational efficiency.

[0085] For example, before the device is operated, 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 designing the residual volume in the hydrogen storage tank 200, thereby controlling the return water time to ensure that the return water time and the water discharge time are consistent.

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

[0087] Alternatively, the water return time can be controlled by adjusting the drainage flow of the hydrogen storage tank 200 to ensure that the water return time is consistent with the water discharge time.

[0088] See also Figure 1 In some embodiments, the power mechanism 600 includes a water pump 610 and a speed regulator 620, which is 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 flow rate of water entering the hydrogen storage tank 200 and thus controlling the gas supply volume of the hydrogen storage tank 200, and facilitating the maintenance of a constant hydrogen pressure.

[0089] It can be understood that the speed regulator 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 to adjust the water flow rate of the first connecting pipe 400, thereby controlling the water discharge time of the water storage tank 300 to ensure that the return water time and the water discharge time are consistent.

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

[0091] The water inlet 220 may be disposed on a side wall of the bottom of the hydrogen storage tank 200. Alternatively, in other embodiments, the water inlet 220 may also be disposed at other locations on the bottom of the hydrogen storage tank 200.

[0092] The water outlet 310 can be set at the lowest point of the bottom of the water tank 300 so that the water in the water tank 300 can be discharged as much as possible. Alternatively, in other embodiments, the water outlet 310 can also be set at other positions at the bottom of the water tank 300.

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

[0094] Optionally, the water inlet valve 221 can also control the water flow 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 is beneficial 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 the water in the water storage tank 300 needs to be input into the hydrogen storage tank 200, the water inlet valve 221 can be opened. Otherwise, the water inlet valve 221 is closed.

[0096] like Figure 1 As shown, for 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 the water in the water storage tank 300 needs to be input into the hydrogen storage tank 200, the water outlet valve 311 can be opened. Otherwise, the water outlet valve 311 is closed.

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

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

[0099] The drain port 230 may be located at the lowest point of the bottom of the hydrogen storage tank 200 so that the water in the hydrogen storage tank 200 can be drained as completely as possible. Alternatively, in other embodiments, the drain port 230 may be located at other locations on the bottom of the drain port 230 .

[0100] The water return port 320 may be disposed on a side wall in the middle of the water storage tank 300. Alternatively, in other embodiments, the water return port 320 may also be disposed at other locations on the side wall of the water storage tank 300, such as near the top.

[0101] like Figure 1 As shown, for example, a drain valve 231 is provided at the drain port 230. The drain valve 231 can be a one-way valve. When the water in the hydrogen storage tank 200 needs to flow back to the water storage tank 300, the drain valve 231 can be opened. Otherwise, the drain valve 231 is closed.

[0102] It can be understood that in other embodiments, the drain valve 231 can be a flow regulating valve, and 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 ensuring that the return water time and the water discharge time are consistent.

[0103] like Figure 1 As shown, for example, a return valve 321 is provided at the return water port 320. The return valve 321 can be a one-way valve. When the water in the hydrogen storage tank 200 needs to flow back to the water storage tank 300, the return valve 321 can be opened. Otherwise, the return valve 321 is closed.

[0104] It is understandable that in other embodiments, the return valve 321 can be a flow regulating valve, which can control the flow of water entering the water tank 300 according to the liquid level in the water tank 300, thereby ensuring that the return time and the water discharge time are consistent.

[0105] See also Figure 1In one embodiment, the gravity reflux hydrogen storage and supply device includes a heating device 700, which is disposed on a 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, Figure 1 As shown, the heating device 700 can be provided on the first connecting pipe 400. When the water in the water tank 300 enters the hydrogen tank 200 via the first connecting pipe 400, the heating device 700 can heat the water entering the hydrogen tank 200. Thus, when the water in the hydrogen tank 200 flows back to the water tank 300, the water in the water tank 300 is also heated.

[0107] It is understood that in other embodiments, the heating device 700 may also be provided 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 may be a heat exchanger, and its heat source may come from various sources, such as waste heat provided by a downstream chemical process or heat from the combustion of hydrogen produced by the hydrogen production equipment 10. For example, the downstream chemical process may be a liquid fuel synthesis process, which utilizes heat generated by hydrogen and carbon to synthesize alcohol fuels.

[0109] Alternatively, the heating device 700 may be an electric heater that can directly perform electrical heating using renewable electricity.

[0110] In an embodiment of the present invention, by providing a heating device 700, the water entering the hydrogen storage tank 200 and the water storage tank 300 can be heated to avoid the occurrence of freezing on the inner walls of the hydrogen storage tank 200 and the water storage tank 300 when storing water in a low-temperature environment, thereby broadening the application scope of the system.

[0111] For example, if the project is located in northern China during the cold winter, ice may form on the inner surface of the water tank 300, affecting the hydrogen supply of the hydrogen storage tank 200. For example, when the water temperature in the tank is below 5°C, the heating device 700 needs to be activated to increase the water temperature to prevent freezing or ice melting.

[0112] In addition, according to the actual situation of the project, in low-temperature areas, equipment pipelines, such as the first connecting pipelines 400 and the second connecting pipelines 500, can be provided with auxiliary heat insulation to prevent local freezing of the pipelines.

[0113] See also 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 when the system is supplying gas, the water in the water tank 300 is transferred to the hydrogen tank 200, which is filled with hydrogen. The water squeezes the hydrogen in the hydrogen tank 200 into the storage pipeline 100 and is supplied to the hydrogen-consuming device 20. During this process, a small amount of hydrogen dissolves in the water. When the water containing a small amount of hydrogen in the hydrogen tank 200 flows back to the water tank 300, the hydrogen recovery device 800 can recover this hydrogen from the water, thereby reducing hydrogen waste and helping to maintain a constant pressure in the water tank 300, ensuring the safety of the device.

[0115] See also Figure 6 In one embodiment, the hydrogen recovery device 800 includes a gas bag 810 that communicates with the top of each water tank 300. By providing the gas bags 810 with communication with the tops of each water tank 300, hydrogen released from the water tanks 300 can be recovered. The gas recovered by the gas bags 810 can then be recycled and reused in a downstream gas processing device. This not only reduces hydrogen waste but also helps maintain a constant pressure within the water tanks 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 the gas-liquid separator is connected to the bottom of the hydrogen storage tank 200, the liquid outlet of the gas-liquid separator is connected to the water storage tank 300, and the gas outlet of the gas-liquid separator can be connected to an external hydrogen storage structure or a hydrogen-using structure, which can be specifically set according to actual needs.

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

[0118] See also Figures 2 to 8 The gravity reflux hydrogen storage and supply system of the present invention can operate in the following four modes. In each figure, the purple-red arrowed lines represent the flow of hydrogen, the green arrowed lines represent the flow of water, and the yellow dotted lines represent control signals.

[0119] 1. When renewable electricity is sufficient, the system enters the inflation stage

[0120] like Figure 2As shown, a system includes four hydrogen storage tanks 200 and two water storage tanks 300. The four hydrogen storage tanks are 200A, 200B, 200C, and 200D, and all are empty. The two water storage tanks are 300A and 300B, and both are pre-stored with water.

[0121] When renewable electricity is abundant and the water electrolysis hydrogen production equipment 10 is operating at full load (a large number of electrolyzers are in operation) or at a high load, the hydrogen produced exceeds the downstream hydrogen consumption flow. In this case, the hydrogen produced by the water electrolysis hydrogen production equipment 10 is not only directly supplied to the hydrogen consumption equipment 20 via the hydrogen consumption pipeline 30, but the excess hydrogen is stored in the hydrogen storage tanks 200 via the storage pipeline 100, indicating that the system enters the charging phase.

[0122] At this time, the hydrogen regulating valve 110 and the gas phase valve 211 of the hydrogen storage tank 200A are opened, and the excess hydrogen will be filled into the hydrogen storage tank 200A through the hydrogen regulating valve 110. Among them, the opening 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. In addition, if the temperature changes beyond a reasonable range, the system can open the gas phase valve 211 of the adjacent hydrogen storage tank 200B to simultaneously inflate the hydrogen storage tank 200A and the hydrogen storage tank 200B to ensure that the hydrogen temperature in each hydrogen storage tank 200 is within a reasonable range, as shown in FIG. Figure 3 shown.

[0123] The hydrogen regulating valve 110 is also pressure-interlocked with the hydrogen tank 200A. When the pressure of the hydrogen tank 200A approaches the pipeline pressure (with a difference of no more than 0.05 MPa), the hydrogen regulating valve 110 fully opens and disconnects from the pressure of the hydrogen tank 200A. Simultaneously, the gas phase valve 211 of the hydrogen tank 200A closes, completing the charging of the hydrogen tank 200A. The system automatically switches to the next hydrogen tank 200 to be charged based on the pressure interlock of each hydrogen tank 200 until all hydrogen tanks 200 are fully filled.

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

[0125] like Figure 4 As shown, a system includes four hydrogen storage tanks 200 and two water storage tanks 300. The four hydrogen storage tanks are 200A, 200B, 200C, and 200D, and all are empty. The two water storage tanks are 300A and 300B, and both are pre-stored with water.

[0126] When the downstream hydrogen-using equipment 20 is under maintenance, the hydrogen-using equipment 20 does not need to use hydrogen, and the hydrogen pipeline 30 is not used. The hydrogen produced by the hydrogen production equipment 10 will be completely stored into each hydrogen storage tank 200 through the storage pipeline 100, and the system enters the charging stage.

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

[0128] 3. When renewable power is insufficient, the system enters the gas supply stage

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

[0130] When renewable power stops or is low, the electrolytic water hydrogen production equipment 10 works at low load (reduces the number of electrolytic cells) or stops working accordingly, and the amount of hydrogen produced by the hydrogen production equipment 10 is less than the amount of hydrogen used downstream. At this time, the hydrogen produced by the electrolytic water hydrogen production equipment 10 is directly supplied to the hydrogen-using equipment 20 through the hydrogen 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] Referring to Figure 5 , when the exhaust starts, the system automatically starts the power mechanism 600, such as a common water pump 610, and the following description uses the water pump 610. Open the gas phase valve 211 of the hydrogen storage tank 200A, open the water outlet valve 311 of the water storage tank 300A, and open the water inlet valve 211 of the hydrogen storage tank 200A. Then the water in the water storage tank 300A can enter the hydrogen storage tank 200A through the first connection pipeline 400 between the water storage tank 300A and the hydrogen storage tank 200A. When the liquid level of the water storage tank 300A gradually decreases to zero and the liquid level of the hydrogen storage tank 200A gradually increases from zero to a specified near-full liquid, 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 exhausted to the storage pipeline 100 and supplied to the hydrogen-using equipment 20, and the exhaust of the hydrogen storage tank 200A ends. At the same time, the system can automatically switch the exhaust according to the change of the liquid level of the hydrogen storage tank 200A, that is, stop the exhaust of the hydrogen storage tank 200A, and switch to the exhaust of the hydrogen storage tank 200B.

[0132] Referring to Figure 6After hydrogen tank 200A is vented, gas phase valve 211 of hydrogen tank 200A is closed, and gas phase valve 211 of hydrogen tank 200B is opened. Simultaneously, drain valve 231 of hydrogen tank 200A and return valve 321 of water tank 300A, as well as outlet valve 311 of water tank 300B and inlet valve 221 of hydrogen tank 200B, are opened. Under the influence of gravity and the expansion of residual gas in the tank's interstitial volume (gas pressure close to the exhaust pressure), the water in hydrogen tank 200A can enter water tank 300A through second connecting pipe 500. When the liquid level in hydrogen tank 200A gradually decreases to zero and the liquid level in water tank 300A gradually increases from zero to a predetermined level close to full, the water in hydrogen tank 200A is completely transferred to water tank 300A.

[0133] At the same time, water from water tank 300B can enter hydrogen tank 200B via first connecting line 400 between water tank 300B and hydrogen tank 200B. When the liquid level in water tank 300B gradually decreases to zero and the liquid level in hydrogen tank 200B gradually increases from zero to a predetermined level close to full, the water in water tank 300B is completely transferred to hydrogen tank 200B, and the hydrogen in hydrogen tank 200B is completely discharged into storage line 100 and supplied to hydrogen-consuming equipment 20, completing the exhaust of hydrogen tank 200B. The system can also automatically switch exhaust modes based on changes in the liquid level of hydrogen tank 200B, stopping exhaust from hydrogen tank 200B and switching to exhaust from hydrogen tank 200C.

[0134] Among them, the return water of water tank 300A and the water discharge of water tank 300B are carried out simultaneously, and the return water time of water tank 300A and the water discharge time of water tank 300B can be ensured to be consistent by setting the height difference and clearance volume between the hydrogen storage tank 200 and the water storage tank 300 and the frequency conversion adjustment of the water pump 610.

[0135] See also Figure 7After the exhaust of hydrogen storage tank 200B is completed, the gas phase valve 211 of hydrogen storage tank 200B is closed, and the gas phase valve 211 of hydrogen storage tank 200C is opened. At the same time, the drain valve 231 of hydrogen storage tank 200B and the backwater valve 321 of water storage tank 300B are opened, and the water outlet valve 311 of water storage tank 300A and the water inlet valve 221 of hydrogen storage tank 200C are opened. Then, the water in hydrogen storage tank 200B can enter water storage tank 300B under the action of the gravity of the water and the expansion of the residual gas in the tank (the gas pressure is close to the exhaust pressure) via the second connecting pipeline 500. When the liquid level of hydrogen storage tank 200B gradually decreases to zero and the liquid level of water storage tank 300B gradually increases from zero to a specified near-full-liquid level, the water in hydrogen storage tank 200B is completely transferred to water storage tank 300B. At the same time, the water in water storage tank 300A can enter hydrogen storage tank 200C under the action of the water pump 610 via the first connecting pipeline 400, so that the hydrogen in hydrogen storage tank 200C is exhausted. In this way, the hydrogen in multiple hydrogen storage tanks 200 can be sequentially supplied to the downstream hydrogen-consuming equipment 20.

[0136] Among them, the backwater of water storage tank 300B and the water outlet of water storage tank 300A are performed simultaneously, and the backwater time of water storage tank 300B and the water outlet time of water storage tank 300A can be ensured to be consistent by setting the height difference and the residual volume of the hydrogen storage tank 200 and the water storage tank 300 and frequency regulation of the water pump 610.

[0137] 4. When there is no renewable power, the system enters the gas supply stage

[0138] As shown in Figure 8 , the system includes four hydrogen storage tanks 200 and two water storage tanks 300. Among them, the four hydrogen storage tanks are 200A, 200B, 200C and 200D, and the four hydrogen storage tanks are all filled with hydrogen. The two water storage tanks are 300A and 300B, and the two water storage tanks are pre-stored with water.

[0139] When there is no renewable power, the water electrolysis hydrogen production equipment 10 stops working, and the hydrogen pipeline 30 is not used. And the hydrogen required by the hydrogen-consuming equipment 20 is all supplemented by the hydrogen in each hydrogen storage tank 200, that is, the system enters the gas supply stage.

[0140] It should be noted that the process of multiple hydrogen storage tanks 200 sequentially supplying hydrogen outward can refer to the gas supply process in the above-mentioned third working condition, which will not be described here.

[0141] The following will be described in detail taking the downstream hydrogen-consuming equipment 20 continuously operating with a hydrogen demand of 50000NM 3 / h as an example.

[0142] Suppose the downstream hydrogen-consuming equipment 20 is a methanol synthesis process equipment. Generally, green methanol synthesis needs to be continuously supplemented with 50000NM3 / h, electrolytic water hydrogen production equipment 10 maximum capacity of 150000NM 3 / h, electrolytic water hydrogen production equipment 10 every day cumulative work 8 hours can meet the methanol plant's dosage.

[0143] For ease of understanding, assume that electrolytic water hydrogen production equipment 10 every day full load work 8 hours, the remaining 16 hours downtime, electrolytic water hydrogen production equipment 10 downtime stage methanol synthesis required by hydrogen from a plurality of hydrogen storage tank 200.

[0144] For example, electrolytic water hydrogen production equipment 10 generated hydrogen pressure is 1.6Mpa. Electrolytic water hydrogen production equipment 10 starts to work, the hydrogen storage capacity per hour is 150000NM 3 / h-50000NM 3 / h=100000NM 3 / h, hydrogen storage time 8h, hydrogen release time 16h, methanol synthesis plant 24h continuous operation.

[0145] It can be understood that electrolytic water hydrogen production equipment 10 every day work 8h hydrogen storage capacity is 800000NM 3 / h(volume flow 57328m 3 / h), then need 2000m 3 , 1.6MPa hydrogen storage tank 29. In electrolytic water hydrogen production equipment 10 stop running in 16 hours, by the 29 hydrogen storage tank 200 provides hydrogen.

[0146] As Figure 5 shown, in the gas supply condition, water storage tank 300A, 300B filled with water, the top gas phase pressure is 1.45Mpa. Each hydrogen storage tank 200 is full of hydrogen, the pressure is 1.6MPa, the temperature is 40 DEG C, need to 50000NM 3 / h hydrogen (volume flow 3583m 3 / h) into the pipe network.

[0147] When the exhaust starts, the water storage tank 300A tank (flow 3583m 3 / h) is completely transferred to the hydrogen storage tank 200A, and the hydrogen in the hydrogen storage tank 200A is discharged. When the hydrogen storage tank 200A exhaust ends, the top hydrogen pressure gradually reduces to 0.1MPa.

[0148] It is calculated that the effective hydrogen storage rate of each hydrogen storage tank 200 is 93.1%. The shaft power of water pump 610 is 1997kw, and the daily power consumption is 16h x 1997kw = 31952kwh. Compared with the traditional hydrogen compressor for gas storage and gas supply mode, the power consumption of the gravity backflow type hydrogen storage and gas supply device and system of the application is greatly reduced.

[0149] The gravity backflow type hydrogen storage and gas supply device and system in the embodiment of the present application utilizes the hydrogen pressure of the hydrogen production equipment to charge each hydrogen storage tank, and uses a power mechanism as power to achieve the purpose of sequentially supplying gas from multiple hydrogen storage tanks by using water as driving medium. Therefore, the gas storage and supply process of the device does not need to use a hydrogen compressor with high cost, and has better safety, lower power consumption, higher reliability and greatly reduced cost. In addition, the residual amount of hydrogen in the hydrogen storage tank is small in each charging and discharging process, so that the utilization rate of the hydrogen storage tank is higher, and the investment cost of the hydrogen storage tank is saved.

[0150] The gravity backflow type hydrogen storage and gas supply device and system in the embodiment of the present application sets the height difference between each water storage tank and hydrogen storage tank and the residual space volume in the tank. After the water in the water storage tank is completely transferred to the hydrogen storage tank to make the hydrogen in the hydrogen storage tank completely discharged, the water in the hydrogen storage tank can automatically backflow to the water storage tank under the action of gravity and the expansion of the residual gas in the residual space volume in the hydrogen storage tank, thereby effectively reducing the complexity and control difficulty of the pipeline, reducing the operation energy consumption of the system and improving the economy of the system operation. While the water in the hydrogen storage tank backflows to one water storage tank, the water in the other water storage tank can be supplied to another hydrogen storage tank to realize gas supply, thereby effectively improving the continuity of the system gas supply process, saving process flow time and improving the operation efficiency of the system.

[0151] The gravity backflow type hydrogen storage and gas supply device and system in the embodiment of the present application sets the height difference between each water storage tank and hydrogen storage tank and / or designs the residual space volume in the hydrogen storage tank, and adjusts the frequency of the water pump, the flow of the first connecting pipeline and the second connecting pipeline, so that the water backflow time of one water storage tank is consistent with the water discharge time of the other water storage tank, thereby effectively improving the continuity of the system gas supply process, saving process flow time and improving the operation efficiency of the system.

[0152] The gravity backflow type hydrogen storage and gas supply device and system in the embodiment of the present application are connected with each other through pipelines between each water storage tank and each hydrogen storage tank, that is, the water in the water storage tank can flow to the hydrogen storage tank through the first connecting pipeline, and the water in the hydrogen storage tank can backflow to the water storage tank through the second connecting pipeline. Since the water operates in a closed pipeline, the water has no contact with air, thereby effectively preventing the corrosion of the inner wall of each water storage tank and each hydrogen storage tank, and effectively prolonging the service life of the storage tank.

[0153] The gravity backflow type hydrogen storage and gas supply device and system in the embodiment of the present application can realize the purpose of sequentially discharging gas from multiple hydrogen storage tanks by using two water storage tanks when supplying gas, thereby reducing the land occupation area of the system and reducing the investment cost of the water storage tank.

[0154] The gravity backflow type hydrogen storage and gas supply device and system in the embodiment of the present application can effectively control the temperature change of hydrogen in the hydrogen storage tank by setting the hydrogen regulating valve to control the hydrogen flow into each hydrogen storage tank according to the hydrogen temperature in each hydrogen storage tank, thereby ensuring that the hydrogen temperature in the hydrogen storage tank is maintained within a reasonable range, avoiding the phenomenon that the safe operation of the hydrogen storage tank is threatened and the hydrogen storage efficiency of the hydrogen storage tank is reduced due to the temperature rise and fall of hydrogen in the hydrogen storage tank.

[0155] The gravity backflow type hydrogen storage and gas supply device and system in the embodiment of the present application can heat the water entering the hydrogen storage tank and the water storage tank by setting the heating device, thereby avoiding the situation that the inner wall of the tank is easy to freeze when the hydrogen storage tank and the water storage tank store water in a low temperature environment, thereby widening the application range of the system.

[0156] The gravity backflow type hydrogen storage and gas supply device and system in the embodiment of the present application can recover the hydrogen dissolved in the water in the water storage tank by setting the hydrogen recovery device, which not only can reduce hydrogen waste, but also is beneficial to maintaining the constant pressure in the water storage tank and ensuring the safety of the device.

[0157] The above embodiments are only exemplary descriptions of structures, and the structures in each embodiment are not fixedly combined structures. In the absence of structural conflicts, the structures in multiple embodiments can be arbitrarily combined for use.

[0158] Although the present application has been described with reference to several exemplary embodiments, it is understood that the terms used are illustrative and exemplary, rather than restrictive. Since the present application can be embodied in various forms without departing from the spirit or essential characteristics thereof, it should also be understood that the above-described embodiments are not limited to any of the aforementioned details, but are to be construed broadly within the spirit and scope of the appended claims, and all changes and modifications that fall within the metes and bounds of the claims, or equivalents of such metes and bounds, are therefore intended to be embraced by the appended claims.

Claims

1. A gravity reflux hydrogen storage and supply device, characterized in that: include: a storage pipeline for connecting to a hydrogen production device to receive hydrogen; A plurality of hydrogen storage tanks are arranged in parallel downstream of the hydrogen production equipment, and the storage pipeline is capable of inputting the received hydrogen into each of the hydrogen storage tanks for storage; At least two water storage tanks, each of which is lower than each of the hydrogen storage tanks in the direction of gravity, and each of the water storage tanks is connected to each of the hydrogen storage tanks via a first connecting pipe and a second connecting pipe respectively; a power mechanism disposed between the water storage tank and the hydrogen storage tank, the power mechanism being capable of transferring water in the water storage tank to the hydrogen storage tank via the first connecting pipe, so that the hydrogen storage tank can provide hydrogen to the outside; When the hydrogen storage tank completes gas supply to the outside, 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, and 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 any one of the hydrogen storage tanks returns water to any one of the water storage tanks is consistent with the time when another one of the water storage tanks feeds water into the other one of the hydrogen storage tanks.

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, which is electrically connected to the water pump. The speed regulator can control the action of the water pump according to the pipeline pressure of the storage pipeline and the liquid level in each hydrogen storage tank and the liquid level in each water storage tank to adjust the flow of the first connecting pipeline.

4. The gravity reflux hydrogen storage and supply device according to claim 1, characterized in that: A water inlet is provided at the bottom of each hydrogen storage tank, a water outlet is provided at the bottom of each water storage tank, and both ends of each first connecting pipe are connected to the water inlet and the water outlet respectively; A water inlet valve is provided at the water inlet, and a water outlet valve is provided at the water outlet.

5. The gravity reflux hydrogen storage and supply device according to claim 4, characterized in that: The water inlet valve is a flow regulating valve, which is used to control the flow of water entering the hydrogen storage tank according to the pipe network 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: The bottom of each hydrogen storage tank is provided with a drain port, the side of each water storage tank is provided with a water return port, and the two ends of each second connecting pipe are connected to the drain port and the water return port respectively; A drain valve is provided at the drain outlet, and a return valve is provided at the return water outlet.

7. The gravity reflux hydrogen storage and supply device according to any one of claims 1 to 6, characterized in that: It includes a heating device, which is arranged on a pipeline connecting the water storage tank and the hydrogen storage tank, and is used to heat 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 is an electric heater, which can directly perform electrical 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: A hydrogen recovery device is included, 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.

10. The gravity reflux hydrogen storage and supply device according to claim 9, characterized in that: The hydrogen recovery device includes an air bag, which is communicated with the top of each water storage tank.

11. The gravity reflux hydrogen storage and supply device according to any one of claims 1 to 6, characterized in that: The top of each hydrogen storage tank is connected to a gas phase pipeline, each gas phase pipeline is connected to the storage pipeline, and each gas phase pipeline is provided 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: It includes a hydrogen regulating valve, which is arranged on the storage pipeline and is used to control the flow of hydrogen entering each hydrogen storage tank according to the hydrogen temperature in each hydrogen storage tank.

13. A gravity reflux hydrogen storage and supply system, characterized in that: It comprises a hydrogen production equipment and a gravity reflux hydrogen storage and gas supply device according to any one of claims 1 to 12, wherein the storage pipeline is connected to the outlet end of the hydrogen production equipment; The outlet end of the hydrogen production equipment is also connected to a hydrogen pipeline, which is arranged in parallel with the storage pipeline. The hydrogen provided to the outside by each hydrogen storage tank can be collected into the hydrogen pipeline.

Images