Low-altitude hydrogen storage agriculture and light complementary system

Abstract

The invention provides a low-altitude hydrogen storage agriculture and light complementary system which is characterized in that a plurality of normal-pressure hydrogen bags are attached to a photovoltaic cell string to form a photovoltaic hydrogen string integrating photovoltaic cells and the normal-pressure hydrogen bags; the electricity generated by photovoltaic hydrogen series is supplied to hydrogen production equipment for use, and the generated hydrogen is injected into a normal-pressure hydrogen bag for normal-pressure storage; the photovoltaic hydrogen strings are hung above the cultivated land at certain safe intervals. According to the invention, the investment and kilowatt-hour cost of energy storage equipment are reduced through comprehensive application of agriculture, light and energy storage, and agricultural production is promoted.

Description

Technical Field

[0001] The present application belongs to the field of agricultural production, photovoltaic power generation and hydrogen energy storage technology, and specifically relates to a low-altitude hydrogen storage agricultural-photovoltaic complementary system. Background Art

[0002] "Photovoltaic power generation method and photovoltaic power generation cable at high altitude on cultivated land (CN117792235B)" authorizes a method and photovoltaic power generation cable for photovoltaic power generation at high altitude on cultivated land. This method lays photovoltaic cell modules on a load-bearing cable with high tensile strength to make a photovoltaic power generation cable (also a photovoltaic cell string), and erects the photovoltaic power generation cable in the air through a towering support, which can not only absorb the surplus solar energy in the air for power generation, but also realize water transport and irrigation, and promote the complementary development of agricultural production and photovoltaic power generation. This method has a large span, few pile foundations, and little impact on agricultural machinery operations. Compared with the existing technology, it overcomes the problems of large wind resistance, high cost, large power generation fluctuation, difficult high-altitude erection, high installation cost, difficult cleaning and maintenance, short service life, and insufficient and effective exploitation of surplus solar energy resources above cultivated land on the photovoltaic cell string on the existing flexible photovoltaic bracket such as "A rocky desertification control system for a large-span flexible bracket photovoltaic power station (CN219812768U)". Its photovoltaic power generation cable is figuratively called photovoltaic line in the market. Photovoltaic lines break through the limitation of traditional photovoltaic panels that need to occupy a large area of ​​land, and achieve the invention purpose of photovoltaics without occupying land. As a clean energy technology, the cost of photovoltaic power generation has dropped significantly in recent years. It is reported that the cost of some photovoltaic power stations has dropped to RMB 0.10 over the entire life cycle. Although the cost of photovoltaic power generation has been greatly reduced, the cost of energy storage is still high, which has become the main obstacle to large-scale replacement of traditional thermal power.

[0003] The development of energy storage technology has undergone decades of evolution, and now it has formed a variety of forms including battery energy storage, pumped energy storage, compressed air energy storage, flywheel energy storage, hydrogen energy storage, etc. Battery energy storage has a high energy conversion efficiency (usually between 85% and 95%). At present, the most mature electrochemical energy storage technology is lithium iron phosphate battery technology, but its cost is still high. The latest report shows that the full life cycle cost is RMB 0.62 / kWh. Pumped energy storage technology is mature and has high economic efficiency. It can provide large-scale and long-term energy storage solutions and is suitable for peak and frequency regulation of power systems. The latest report shows that it is RMB 0.21 / kWh, but its initial construction investment is large, the site selection requirements are high, and its applicability is limited. Compressed air energy storage has the potential for large-scale and long-term energy storage, but the energy conversion efficiency is relatively low (between 40% and 70%), the system is complex and depends on geological conditions. Flywheel energy storage is known for its high power density, long life and fast response, and is suitable for short-term energy storage and high frequency regulation. However, its low energy density and high manufacturing cost limit its application in large-scale energy storage. Hydrogen production by water electrolysis and hydrogen energy storage can achieve ultra-long-term energy storage, which is particularly suitable for combination with renewable energy. However, its energy conversion efficiency is low (less than 50%), the cost of hydrogen production is high, and hydrogen storage and transportation face challenges. High-pressure gaseous hydrogen storage technology is currently the most mature and most commonly used hydrogen storage method. However, in the process of compressing hydrogen, about 15% of electrical energy or mechanical energy is consumed, which has high energy consumption and high cost. Because of its large size, large footprint, and uneconomical and practical nature, atmospheric pressure gaseous hydrogen storage has not been reported or used.

[0004] In-depth analysis and research show that in practical applications, high-pressure gaseous hydrogen storage technology faces problems such as high energy consumption in the compression and release process, large investment in high-pressure hydrogen storage tank equipment, large amount of land resources required, and high maintenance costs. Summary of the invention

[0005] The purpose of this application is to provide a low-altitude hydrogen storage and agricultural photovoltaic complementary system to reduce energy storage costs, promote agricultural production, and provide a new low-cost technical path for photovoltaic power generation to replace thermal power.

[0006] In order to achieve the above-mentioned invention objectives, the present application provides a low-altitude hydrogen storage and agricultural-photovoltaic complementary system as follows.

[0007] The present application provides a low-altitude hydrogen storage and agricultural photovoltaic complementary system, including a flexible photovoltaic support and a photovoltaic cell string installed thereon (such as a photovoltaic cell assembly used in suspension such as a photovoltaic power generation cable), characterized in that: the photovoltaic cell string is provided with a plurality of (in series or / and in parallel) normal-pressure hydrogen bags, and a set safety distance S (S≥0.15m is preferred, and S≥1.5m is the safest) is maintained between these hydrogen bags to form a photovoltaic hydrogen string integrating a photovoltaic cell (power generation unit) and a normal-pressure hydrogen bag (energy storage unit); the photovoltaic hydrogen string is connected to a hydrogen production device through a hydrogen pipeline to realize the preparation and transportation of hydrogen; the electric energy generated by the photovoltaic hydrogen string is supplied to the hydrogen production device, and the generated hydrogen is injected into the normal-pressure hydrogen bag through the hydrogen pipeline and stored at normal pressure; the photovoltaic hydrogen string is suspended from both ends by vertical supports and suspended above the cultivated land; a certain safety distance K (K≥0.5m is preferred, and K≥1.5m is the safest) is opened between the photovoltaic hydrogen strings.

[0008] The reason why this application uses retractable containers such as atmospheric pressure hydrogen bags to store hydrogen is that they can adjust gas storage and discharge, save energy, are easy to empty, and have low cost. The reason why this application uses atmospheric pressure hydrogen storage instead of high pressure hydrogen storage is that it is energy-saving and low-cost. The only disadvantage is that it occupies a large area. However, this application cleverly uses the idle space under the photovoltaic panels to solve the problem of large area occupied by atmospheric pressure hydrogen storage.

[0009] Preferably, the low-altitude hydrogen storage and agricultural-photovoltaic complementary system is characterized in that the atmospheric pressure hydrogen bag is provided with a protective shell (such as a protective sleeve, a protective cover, a protective net, a protective tube and other protective layers) to prevent accidental damage (such as piercing by sharp objects such as flying sand and rocks blown by strong winds, or corrosion by bird droppings or animal bites) and causing leakage.

[0010] Preferably, the low-altitude hydrogen storage and agricultural-photovoltaic complementary system is characterized in that: photovoltaic cells are laid on a protective shell, and the photovoltaic cells, protective shell, normal-pressure hydrogen bags, hydrogen holes, and exhaust holes together constitute a normal-pressure hydrogen storage photovoltaic tank that integrates a photovoltaic cell (power generation unit) and a normal-pressure hydrogen bag (energy storage unit).

[0011] Preferably, the low-altitude hydrogen storage and agricultural-photovoltaic complementary system is characterized in that the design working pressure of the normal-pressure hydrogen bag does not exceed 0.28MPa to ensure the low-pressure safe operation of the system. Studies have shown that when the air pressure in the bag is higher than 0.28MPa, the cost of the bag will increase significantly, the energy consumption of compressed hydrogen will also increase significantly, and it is easy to cause bursting and leakage. This application regards the safe working pressure of less than 0.28MPa that is not easy to cause bursting as normal pressure. That is, the normal pressure described in this application includes low pressure with a pressure ≤0.28MPa.

[0012] Preferably, the low-altitude hydrogen storage and agricultural-photovoltaic complementary system is characterized in that: the hydrogen pipeline is connected to a hydrogen fuel cell system for generating electricity when there is no sunlight, so as to achieve continuous and stable power supply to the power grid or electrical appliances; or, the hydrogen pipeline is connected to a hydrogen combustion power generation device for generating electricity instead of fossil fuels, so as to achieve continuous and stable power supply to the power grid or electrical appliances.

[0013] Preferably, the low-altitude hydrogen storage and agricultural photovoltaic complementary system is characterized in that a normal-pressure hydrogen bag is installed in a cylindrical photovoltaic power generation cable, and the cylindrical photovoltaic power generation cable also serves as a protective shell to prevent leakage caused by accidental bumps and damage.

[0014] Preferably, the low-altitude hydrogen storage and agricultural photovoltaic complementary system is characterized by: the safety thickness (also known as the safety height) G of the atmospheric pressure hydrogen bag is between 0.12-1.2 meters, the safety width D is between 0.12-1.2 meters (preferably D≤0.5 meters), and the safety length C is between 0.12-12.8 meters; the hanging safety spacing K of the photovoltaic hydrogen string is not less than 0.5 meters (or 1 meter or 2 meters or 3 meters), the hanging safety height H is not less than 1 meter (greater than 3 meters or 5 meters is better, because the higher the H, the faster the wind speed, in case of hydrogen leakage, the easier it is to spread with the wind, and the less likely it is to cause an explosion), the hanging safety space ratio D / K is not greater than 3 (or 2 or 1 or 0.5 or 0.3), and the hanging safety height ratio K / H is not greater than 2 (or 1 or 0.5 or 0.25); the shadow of the same photovoltaic hydrogen string stays on the same crop for no more than 30 minutes. The reason for this setting is that, according to the average power generation efficiency of existing photovoltaic cells of 23%, according to the local peak sunshine hours, each square meter of photovoltaic cells can generate 1 kWh of electricity per day, and according to the existing technical level of water electrolysis hydrogen production, 1 kWh can produce 0.2 standard cubic meters of hydrogen. That is, one square meter of photovoltaic cells can only produce 0.2 standard cubic meters of hydrogen with the electricity generated in one day. A 0.2-meter-thick normal-pressure hydrogen bag can only store hydrogen produced by the power generation on that day, while a 1.2-meter-thick normal-pressure hydrogen bag can store hydrogen produced by 6 days of power generation.

[0015] Preferably, the low-altitude hydrogen storage and agricultural photovoltaic complementary system is characterized by: ① The photovoltaic cell string is a photovoltaic power generation cable (capable of generating electricity through light) with a safety width of D (preferably D≤0.5m / if it is a circular cable, D is the diameter) encapsulated with photovoltaic cells; ② A certain safety distance K (K is also the distance between the shadows of the horizontal projection) is opened between (two adjacent) photovoltaic power generation cables, and they are erected above the cultivated land through supports and load-bearing cables; ③ D / K≤0.50, so as to ensure that the shadow of the photovoltaic power generation cable falling on the cultivated land can quickly pass over the same crop as the sun moves, thereby avoiding the same crop from staying in the shadow of the photovoltaic power generation cable for a long time, thereby reducing photosynthesis and causing crop yield reduction.

[0016] Preferably, the low-altitude hydrogen storage and agricultural photovoltaic complementary system is characterized in that the flexible photovoltaic panel is also used as a plate (part) of the protective shell, and the two are combined into one to form a normal pressure hydrogen storage photovoltaic tank. In this solution, the special material for the protective shell is omitted, and the cost of the normal pressure hydrogen storage photovoltaic tank can be greatly reduced.

[0017] The cultivated land mentioned in this application generally refers to the ground covered with green plants, including but not limited to woodland, grassland, farmland, hillside, gully, flower and tree orchard, including the ditch, canal, road and ridge in the cultivated land. In addition, it also includes the green belt in the middle of the road and on both sides. As the name implies, the photovoltaic cell string mentioned in this application is a photovoltaic cell assembly laid in a string.

[0018] Compared with the prior art, the present application has the following beneficial technical effects.

[0019] First, the photovoltaic cell (power generation unit) and the atmospheric pressure hydrogen bag (energy storage unit) are integrated into one, which can share space and flexible photovoltaic brackets, do not occupy land resources, and promote agricultural production. Like the "High-altitude photovoltaic power generation method for cultivated land and photovoltaic power generation cable (CN117792235B)", it has a large span and few piles, which can avoid serious interference with agricultural machinery operations and achieve the purpose of photovoltaics not occupying land. The electricity generated can be used to supplement the light of crops and pump water for irrigation, which can promote agricultural production and income.

[0020] Second, compared with high-pressure gaseous hydrogen storage, the energy conversion efficiency is greatly improved. High-pressure gaseous hydrogen storage consumes 10-15% of electricity in the process of compressing hydrogen, and 5-10% of electricity is required for heating during the process of releasing hydrogen for power generation. However, this application is for normal pressure hydrogen storage, which does not require electricity to compress hydrogen, and does not require electricity to heat and release hydrogen, thus saving 15-25% of energy consumption and increasing energy conversion efficiency by 15-25%. This significant efficiency improvement greatly reduces the cost of photovoltaic power generation and energy storage, and the economic value is considerable.

[0021] Third, the cost of containers is greatly reduced for normal pressure hydrogen storage. The cost of high-pressure hydrogen storage tanks accounts for an important proportion of the total cost of high-pressure gaseous hydrogen storage and power generation technology. According to publicly released information, the cost of carbon fiber composite materials can account for 75%-78% of the total cost of type IV hydrogen storage bottle systems. This shows that the cost of carbon fiber composite materials accounts for the vast majority of the total cost of type IV hydrogen storage tanks. It can be seen that the cost of high-pressure hydrogen storage tanks (including materials, manufacturing, testing and certification costs) accounts for a considerable proportion of the total cost of high-pressure gaseous hydrogen storage and power generation technology, and is the most important part of the total cost. Public data shows that the current cost of high-pressure hydrogen storage is higher than 4,000 yuan / kg. The normal-pressure hydrogen bag in this application costs less than 600 yuan / kg, is highly safe, and is not prone to leakage. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a schematic diagram of the appearance structure of a section (cylindrical) atmospheric pressure hydrogen storage photovoltaic tank in the present application (Example 1).

[0023] Figure 2 for Figure 1 Schematic diagram of the longitudinal cross-section structure of a medium-pressure hydrogen storage photovoltaic tank.

[0024] Figure 3 for Figure 1 Schematic diagram of the structure of an atmospheric pressure hydrogen bag used in a medium atmospheric pressure hydrogen storage photovoltaic tank.

[0025] Figure 4 for Figure 1 Schematic diagram of the appearance structure of multiple atmospheric pressure hydrogen storage photovoltaic tanks connected in series to form a photovoltaic hydrogen string.

[0026] Figure 5 for Figure 4 Schematic diagram of the structure in which multiple photovoltaic hydrogen strings are suspended above farmland.

[0027] Figure 6 This is a schematic diagram of the appearance structure of a section (box-type) atmospheric pressure hydrogen storage photovoltaic tank in the present application (Example 2).

[0028] Figure 7 for Figure 6 Schematic diagram of the longitudinal cross-section structure of a medium-pressure hydrogen storage photovoltaic tank.

[0029] Figure 8 for Figure 4 Schematic diagram of an application of a medium-atmospheric pressure hydrogen storage photovoltaic tank.

[0030] Fig. 9 This is a schematic diagram of the appearance structure of a streamlined atmospheric pressure hydrogen storage photovoltaic tank in the present application (Example 3).

[0031] Fig.10 This is a schematic diagram of the appearance structure of another streamlined atmospheric pressure hydrogen storage photovoltaic tank in the present application (Example 3).

[0032] Fig.11 This is another schematic diagram of the external structure of a photovoltaic hydrogen string in which multiple normal pressure hydrogen bags and photovoltaic panels are connected in series.

[0033] Explanation of the accompanying numbers: 1-photovoltaic cell, 2-normal pressure hydrogen bag, 3-hydrogen pipeline, 4-water electrolysis hydrogen generator, 5-hydrogen fuel cell, 6-protective casing, 7-hydrogen, 8-land, 9-normal pressure hydrogen storage photovoltaic tank, 10-load-bearing cable, 11-hydrogen hole, 12-photovoltaic hydrogen string, 13-support, 14-agricultural machinery, 15-crops, 16-photovoltaic wires, 17-grid, 18-hanging ring, 19-exhaust hole, 20-end cover. DETAILED DESCRIPTION

[0034] In order to make the technical means, creative features, objectives and effects achieved by this application easy to understand, this application is further explained below in conjunction with specific implementation methods.

[0035] In the description of the present application, it should be noted that the terms "upper", "lower", "inside", "inner", etc. indicating directions or positional relationships are based on the directions or positional relationships shown in the accompanying drawings and are only for the convenience of describing the present application and simplifying the description. They do not indicate or imply that the device referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they should not be understood as limitations on the present application.

[0036] It should be noted that, unless otherwise clearly specified and limited, the terms "installation", "placement", "connection", etc. should be understood in a broad sense. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0037] Embodiment 1.

[0038] like Figure 1 , Figure 2 , Figure 3 As shown, a double-pass plastic bottle with a diameter of 0.3 meters, a length of 2 meters, and a wall thickness of 3mm is injection molded as a protective shell 6, a layer of (flexible) photovoltaic cell 1 with an area of ​​1.4m×2m is attached to the surface of the upper half, and a biogas bag with a diameter of 0.28 meters and a length of 1.98 meters is installed inside as a normal-pressure hydrogen bag 2, and the hydrogen hole 11 of the normal-pressure hydrogen bag 2 is passed through the exhaust hole 19 of the protective shell 6. In this way, a photovoltaic cell 1 (power generation unit) and a normal-pressure hydrogen bag 2 (energy storage unit) for storing hydrogen 7 are made, which are composed of a photovoltaic cell 1, a protective shell 6, a normal-pressure hydrogen bag 2, a hydrogen hole 11, and an exhaust hole 19. The normal-pressure hydrogen storage photovoltaic tank 9 is integrated into one. The normal-pressure hydrogen bag 2 described in this application generally refers to a retractable container, such as a biogas bag, a rubber dam bag, a bellows, and other retractable containers. The exhaust hole 19 is used to exhaust the air between the protective shell 6 and the normal-pressure hydrogen bag 2 when injecting hydrogen 7 into the normal-pressure hydrogen bag 2, so that the internal pressure of the normal-pressure hydrogen bag 2 is balanced with the atmospheric pressure.

[0039] like Figure 4 As shown, the numerous atmospheric hydrogen storage photovoltaic tanks 9 made in the previous step are connected in series with two parallel horizontal load-bearing ropes 10 (for example, steel ropes with a diameter of 17.2 mm) and hanging rings 18, and the hydrogen holes 11 of the atmospheric hydrogen bags 2 are connected end to end, so as to make a photovoltaic hydrogen string 12 that integrates a photovoltaic cell 1 (power generation unit) and an atmospheric hydrogen bag 2 (energy storage unit). A certain safety distance S should be opened between adjacent atmospheric hydrogen bags 2, S should be ≥ 0.2 meters, S ≥ 0.5 meters is safer, and S ≥ 1.5 meters is the safest.

[0040] Preferably, if Fig.11 As shown, multiple rubber dams made of weather-resistant materials and atmospheric pressure hydrogen bags 2 that do not require a protective shell 6 are tied to the back of a photovoltaic cell 1 and connected by two parallel horizontal load-bearing cables 10 to form a photovoltaic hydrogen string 12, which is suspended above the cultivated land 8.

[0041] like Figure 5 As shown, the numerous photovoltaic hydrogen strings 12 made in the previous step are suspended above the cultivated land 8 through the vertical supports 13, so that the safe suspension spacing K ≥ 0.5 meters (preferably K ≥ 1.5 meters), the safe suspension height H ≥ 5 meters, the safe suspension spacing ratio D / K ≤ 3, and the safe suspension height ratio K / H ≤ 2, so that the shadow of the same photovoltaic hydrogen string 12 stays on the same crop for no more than 30 minutes. In this way, the cultivated land 8 can be efficiently utilized to avoid waste of land resources, and safety can be guaranteed. Even if a normal pressure hydrogen bag 2 accidentally explodes, it will not affect the adjacent normal pressure hydrogen bags 2, and will not cause a chain explosion.

[0042] like Figure 8 As shown, both ends of the photovoltaic hydrogen string 12 are connected to hydrogen production equipment such as a water electrolysis hydrogen generator 4 through a hydrogen pipeline 3 to achieve the preparation and transportation of hydrogen 7. When there is sufficient sunlight or surplus electricity, the electricity generated by the photovoltaic cells 1 in the photovoltaic hydrogen string 12 is supplied to the hydrogen production equipment through the photovoltaic wires 16, and the generated hydrogen 7 is injected into a plurality of normal pressure hydrogen bags 2 through the hydrogen pipeline 3 and stored at normal pressure.

[0043] Preferably, the safety thickness (also called safety height) G of the atmospheric pressure hydrogen bag is set to 0.12-1.2 meters, the width D of the atmospheric pressure hydrogen storage photovoltaic tank 9 is set to 0.12-1.2 meters (preferably D≤0.5 meters), and the length is set to 2 meters; the hanging safety spacing K of the photovoltaic hydrogen string 12 is ≥0.5 meters (or 1 meter or 2 meters or 3 meters), the hanging safety height H≥1 (or 2 meters or 5 meters), the hanging safety space ratio D / K≤3 (or 2 or 1 or 0.5 or 0.3), the hanging safety height ratio K / H≤2 (or 1 or 0.5 or 0.25), and the shadow of the same photovoltaic hydrogen string 12 stays on the same crop 15 for no more than 30 minutes. The reason for this setting is that according to the average power generation efficiency of the existing photovoltaic cell 1 of 23%, according to the local peak sunshine hours, each square meter of the photovoltaic cell 1 can generate 1 kWh of electricity per day, and according to the existing technical level of water electrolysis hydrogen production, 1 kWh can produce 0.2 standard cubic meters of hydrogen 7. That is to say, one square meter of photovoltaic cell 1 can only produce 0.2 standard cubic meters of hydrogen 7 with the electricity generated in one day. A 0.2-meter thick normal-pressure hydrogen bag 2 can only store hydrogen 7 produced by the power generation on that day, while a 1.2-meter thick normal-pressure hydrogen bag 2 can store hydrogen 7 produced by six days of power generation.

[0044] Preferably, the design working pressure of the atmospheric pressure hydrogen bag 2 does not exceed 0.28MPa to ensure safe operation. Studies have shown that when the air pressure in the bag is higher than 0.28MPa, the cost of the bag (for example, using a retractable container such as an inflatable rubber dam as the atmospheric pressure hydrogen bag 2) will increase significantly, the energy consumption of the compressed hydrogen 7 will also increase significantly, and it is easy to cause bursting and leakage. This application regards the safe working pressure of less than 0.28MPa that is not easy to cause bursting and leakage as normal pressure. That is, the normal pressure described in this application includes a low pressure of ≤0.28MPa.

[0045] Preferably, the hydrogen pipeline 3 is connected to a hydrogen fuel cell 5 system for generating electricity when there is no sunlight, so as to achieve continuous and stable power supply to the power grid or electrical equipment; or, the hydrogen pipeline 3 is connected to an existing hydrogen combustion power generation device (such as a gas turbine) for replacing fossil fuels (such as coal, natural gas, diesel) for generating electricity.

[0046] Embodiment 2.

[0047] like Figure 6 , Figure 7 As shown, an aluminum box with a width D of 0.3 meters, a thickness D of 0.3 meters, a length of 1.2 meters, and a wall thickness of 0.3 mm is processed as a protective shell 6, a layer of (monocrystalline silicon) photovoltaic cell 1 with an area of ​​0.3m×1.2m is attached to its upper surface, and a biogas bag with a width D of 0.27 meters, a thickness D of 0.27 meters, and a length of 1.1 meters is installed inside as a normal pressure hydrogen bag 2, and the hydrogen hole 11 of the normal pressure hydrogen bag 2 is passed through the pipe joint of the exhaust hole 19 of the protective shell 6. In this way, a rectangular box-type normal pressure hydrogen storage photovoltaic tank 9 consisting of a photovoltaic cell 1 plate, a rectangular box-type protective shell 6, a rectangular normal pressure hydrogen bag 2, a hydrogen hole 11, and an exhaust hole 19 is manufactured.

[0048] refer to Figure 8 , connect the rectangular box-type atmospheric pressure hydrogen storage photovoltaic tanks 9 end to end to form a photovoltaic hydrogen string 12, and suspend it in the air as in the above embodiment, and then connect it to hydrogen production equipment such as water electrolysis hydrogen generator 4 through hydrogen pipeline 3 to achieve the preparation and transportation of hydrogen 7. When there is sufficient sunlight or surplus electricity, the electricity generated by the photovoltaic cell 1 in the photovoltaic hydrogen string 12 is supplied to the hydrogen production equipment through photovoltaic wire 16, and the generated hydrogen 7 is injected into the atmospheric pressure hydrogen bag 2 through hydrogen pipeline 3 and stored at normal pressure. When there is no sunlight, the hydrogen 7 can be released to generate electricity to achieve continuous and stable power supply to power grids or electrical appliances and other electrical equipment.

[0049] Embodiment three.

[0050] In order to reduce wind resistance and improve the wind resistance of the photovoltaic hydrogen string 12, it is desirable that Fig. 9As shown, a streamlined atmospheric pressure hydrogen storage photovoltaic tank 9 is made by using a streamlined protective shell 6 and a flexible photovoltaic cell 1 plate.

[0051] Preferably, if Fig.10 As shown, a normal pressure hydrogen storage photovoltaic tank 9 is made by rolling a flexible photovoltaic cell 1 plate with a very small bending radius (e.g. less than 0.35 meters) and only the upper half having a cell sheet into a cylinder, and closing both ends with end caps 20, so as to make a normal pressure hydrogen storage photovoltaic tank 9. In this scheme, the cylindrical flexible photovoltaic cell 1 plate is also used as a protective shell 6, achieving two uses of one thing and saving the cost of a dedicated protective shell 6. Also refer to Figure 1 , Figure 2 , Figure 6 , Figure 7 , a photovoltaic cell 1 plate is used as (a part of) the plate of the protective shell 6 to make a normal pressure hydrogen storage photovoltaic tank 9.

[0052] What is disclosed above is only a preferred embodiment of the present application. The drawings are merely schematic structural diagrams and are not drawn according to the actual size ratio. They cannot be used to limit the scope of rights of the present application. Equivalent changes made based on the claims of the present application still fall within the scope covered by the present application.

Claims

1. A low-altitude hydrogen storage and agricultural photovoltaic complementary system, comprising a flexible photovoltaic support and a photovoltaic cell string installed thereon, characterized in that: A plurality of normal-pressure hydrogen bags are attached to the photovoltaic cell string, and a set safety distance S is maintained between the hydrogen bags to form a photovoltaic hydrogen string integrating photovoltaic cells and normal-pressure hydrogen bags; the photovoltaic hydrogen string is connected to the hydrogen production equipment through a hydrogen pipeline to realize the preparation and transportation of hydrogen; the electricity generated by the photovoltaic hydrogen string is supplied to the hydrogen production equipment, and the generated hydrogen is injected into the normal-pressure hydrogen bags through the hydrogen pipeline and stored at normal pressure; the photovoltaic hydrogen string is suspended from both ends by vertical supports and hung above the cultivated land; a certain safety distance K is opened between the photovoltaic hydrogen strings.

2. The low-altitude hydrogen storage and agricultural photovoltaic complementary system according to claim 1 is characterized by: The atmospheric pressure hydrogen bag is equipped with a protective shell to prevent leakage caused by accidental bumps and damage.

3. The low-altitude hydrogen storage and agricultural-photovoltaic complementary system according to claim 2 is characterized by: The photovoltaic cells are laid on the protective shell. The photovoltaic cells, the protective shell, the normal-pressure hydrogen bag, the hydrogen holes and the exhaust holes together constitute a normal-pressure hydrogen storage photovoltaic tank that integrates the photovoltaic cells and the normal-pressure hydrogen bag.

4. The low-altitude hydrogen storage and agricultural photovoltaic complementary system according to claim 1 is characterized by: The design working pressure of the atmospheric pressure hydrogen bag does not exceed 0.28MPa to ensure the low-pressure safe operation of the system.

5. The low-altitude hydrogen storage and agricultural-photovoltaic complementary system according to claim 1 is characterized by: The hydrogen pipeline is connected to a hydrogen fuel cell system for generating electricity when there is no sunlight, so as to achieve continuous and stable power supply to the power grid or electrical appliances; or, the hydrogen pipeline is connected to a hydrogen combustion power generation device for generating electricity instead of fossil fuels, so as to achieve continuous and stable power supply to the power grid or electrical appliances.

6. The low-altitude hydrogen storage and agricultural-photovoltaic complementary system according to claim 1, 2, 3, 4, or 5, characterized in that: The safety thickness G of the atmospheric pressure hydrogen bag is between 0.12-1.2 meters, the safety width D is between 0.12-1.2 meters, and the safety length C is between 0.12-12.8 meters; the hanging safety spacing K of the photovoltaic hydrogen string is not less than 0.5 meters, the hanging safety height H is not less than 1 meter, the hanging safety space ratio D / K is not greater than 3, and the hanging safety height ratio K / H is not greater than 2.

7. The low-altitude hydrogen storage and agricultural-photovoltaic complementary system according to claim 1, 2, 3, 4, or 5, characterized in that: Photovoltaic cell strings are photovoltaic power generation cables with a safety width of D, which are encapsulated with photovoltaic cells. A certain safety distance K is left between the photovoltaic power generation cables, and they are erected above the cultivated land through supports and load-bearing cables. D / K≤0.50, to ensure that the shadow of the photovoltaic power generation cable cast on the cultivated land can quickly pass through the same crop as the sun moves, avoiding the same crop from staying in the shadow of the photovoltaic power generation cable for a long time, thereby reducing photosynthesis.

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