Heat storage device coupled with metal hydride and photo-thermal power generation system

Abstract

The invention discloses a heat storage device coupled with metal hydride and a photo-thermal power generation system, and relates to the technical field of energy storage. The heat storage device coupled with the metal hydride comprises a high-temperature fused salt storage tank and a hydrogen storage tank, the high-temperature fused salt storage tank is provided with a high-temperature fused salt input port and a high-temperature fused salt output port, a metal hydride storage tank is arranged in the high-temperature fused salt storage tank, the metal hydride storage tank is filled with the metal hydride, and the metal hydride storage tank is communicated with the hydrogen storage tank. The high-temperature fused salt heats the metal hydride in the metal hydride storage tank, so that the metal hydride is heated to release hydrogen and the hydrogen is stored in the hydrogen storage tank. And after the temperature of the fused salt is reduced, hydrogen in the hydrogen storage tank is released to the metal hydride storage tank, so that the dehydrogenation-state material absorbs the hydrogen and releases heat to heat the fused salt in the high-temperature fused salt storage tank, and heat storage and heat release are achieved. By combining the high heat storage density of the metal hydride and the good fluidity of the fused salt, the heat transfer performance and the heat storage efficiency of the heat storage device are improved.

Description

Technical Field

[0001] This invention relates to the field of energy storage technology, and in particular to a thermal storage device coupled with a metal hydride and a solar thermal power generation system. Background Technology

[0002] Against the backdrop of continuously rising global energy demand and increasing pressure on environmental protection, the development and utilization of renewable energy has become an important trend in the global energy transition. Solar energy, as a clean and renewable energy source, has received widespread attention and research. Concentrated solar power (CSP) technology, as a highly efficient method of utilizing solar energy, heats a working medium by focusing the thermal energy of sunlight, thereby driving power generation equipment to produce electricity.

[0003] However, the power generation efficiency of concentrated solar power (CSP) is greatly affected by environmental factors, and it cannot achieve stable power generation around the clock, operating efficiently only during periods of abundant sunshine. Unfortunately, this peak power generation period often does not match the peak electricity demand period of the power grid, and there may even be a surplus of electricity during periods of low grid load, leading to wasted power. Conversely, during peak grid load periods, CSP is in a low-load period, unable to provide sufficient power support to the grid, thus creating a supply-demand imbalance.

[0004] The intermittent and unstable nature of solar energy leads to discontinuous energy supply. Therefore, researching and coupling thermal storage devices to balance energy supply and demand has become a core issue in the field of concentrated solar power (CSP). Metal hydride thermal storage technology has attracted much attention due to its high thermal density and excellent thermal cycle performance. In this technology, metal hydrides release hydrogen gas when absorbing heat, a process called dehydrogenation. Conversely, dehydrogenated metal hydrides can release heat after reabsorbing hydrogen gas, thus achieving efficient energy conversion. However, it is worth noting that metal hydrides remain solid throughout the heat storage and release processes, which limits the flow and transfer of heat, resulting in low thermal storage efficiency and poor heat transfer properties in the thermal storage device. Summary of the Invention

[0005] The main objective of this invention is to propose a thermal storage device and a solar thermal power generation system coupled with metal hydrides, aiming to solve the problem that metal hydrides remain in a solid state during the thermal storage and release process, which limits the flow and transfer of heat, resulting in low thermal storage efficiency and poor heat transfer.

[0006] To achieve the above objectives, the thermal storage device for coupled metal hydrides proposed in this invention includes a high-temperature molten salt storage tank and a hydrogen storage tank. The high-temperature molten salt storage tank is provided with a high-temperature molten salt inlet and a high-temperature molten salt outlet. A metal hydride storage tank is provided inside the high-temperature molten salt storage tank. The metal hydride storage tank is filled with metal hydride and is connected to the hydrogen storage tank.

[0007] In one embodiment, the thermal storage device coupled with the metal hydride further includes a hydrogen pipeline connecting the metal hydride storage tank and the hydrogen storage tank, and the hydrogen pipeline is equipped with a hydrogen valve.

[0008] In one embodiment, the high-temperature molten salt storage tank is provided with a plurality of metal hydride storage tanks, which are arranged in a matrix.

[0009] The present invention also proposes a solar thermal power generation system, which includes a heliostat, a heat collection tower, a heat storage device coupled with a metal hydride as described in any of the above embodiments, a steam generator, a generator set, and a low-temperature molten salt storage tank. The heliostat is positioned facing the heat collection tower. The heat collection tower, the high-temperature molten salt storage tank, the steam generator, and the low-temperature molten salt storage tank are connected in sequence. The low-temperature molten salt storage tank is connected to the heat collection tower, and the steam generator is connected to the generator set.

[0010] In one embodiment, the solar thermal power generation system further includes a first molten salt pipe and a second molten salt pipe. The first molten salt pipe connects the solar collector tower to the high-temperature molten salt inlet, and the second molten salt pipe connects the high-temperature molten salt outlet to the steam generator. A first molten salt valve is provided on the first molten salt pipe, and a second molten salt valve is provided on the second molten salt pipe.

[0011] In one embodiment, the steam generator includes a housing and a heat exchange pipe. A steam chamber is formed inside the housing, and the steam chamber contains a heat exchange liquid. The heat exchange pipe enters the steam chamber from the outer wall of the housing and exits the housing from the inner wall of the steam chamber. The inlet of the heat exchange pipe is connected to the second molten salt pipe, and the outlet of the heat exchange pipe is connected to the low-temperature molten salt storage tank.

[0012] In one embodiment, the solar thermal power generation system further includes a third molten salt pipe and a fourth molten salt pipe. The third molten salt pipe connects the outlet of the heat exchange pipe to the low-temperature molten salt storage tank, and the fourth molten salt pipe connects the low-temperature molten salt storage tank to the solar collector tower. The third molten salt pipe is equipped with a third molten salt valve, and the fourth molten salt pipe is equipped with a fourth molten salt valve.

[0013] In one embodiment, the generator set includes a steam input pipe, a steam turbine, a steam output pipe, and a generator. The steam input pipe connects the steam chamber to the steam input port of the steam turbine, the steam output pipe connects the steam output port of the steam turbine to the steam chamber, and the generator is connected to the output shaft of the steam turbine.

[0014] In one embodiment, the generator set further includes a condenser and a connecting pipe, wherein the steam output pipe, the condenser, the connecting pipe and the steam chamber are connected in sequence.

[0015] In one embodiment, the solar thermal power generation system includes a plurality of heliostats arranged circumferentially along the solar collector tower.

[0016] The thermal storage device coupled with metal hydrides proposed in this invention includes a high-temperature molten salt tank and a hydrogen storage tank. The high-temperature molten salt tank has a high-temperature molten salt inlet and a high-temperature molten salt outlet. A metal hydride storage tank is located inside the high-temperature molten salt tank and is filled with metal hydrides. The metal hydride storage tank is connected to the hydrogen storage tank. High-temperature molten salt enters the high-temperature molten salt tank through the high-temperature molten salt inlet and heats the metal hydride storage tank. The metal hydride in the metal hydride storage tank releases hydrogen upon heating and is stored in the hydrogen storage tank. When the temperature of the molten salt in the high-temperature molten salt tank decreases, hydrogen is released from the hydrogen storage tank to the metal hydride storage tank. The dehydrogenated material in the metal hydride storage tank absorbs the hydrogen and releases a large amount of heat, heating the molten salt in the high-temperature molten salt tank. The heated molten salt leaves the high-temperature molten salt tank through the high-temperature molten salt outlet. This achieves both heat storage and heat release, and is suitable for situations where peak power generation and peak power consumption do not occur simultaneously. This invention improves the heat transfer and heat storage efficiency of the heat storage device by using metal hydride thermal storage technology coupled with molten salt, combining the high thermal storage density of metal hydrides with the good fluidity of molten salt. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0018] Figure 1 A schematic diagram of a structural embodiment of the thermal storage device coupled with metal hydrides provided by the present invention;

[0019] Figure 2 This is a schematic diagram of an embodiment of the solar thermal power generation system provided by the present invention.

[0020] Explanation of icon numbers:

[0021] 1000. Thermal storage device coupled with metal hydride; 11. High-temperature molten salt storage tank; 11a. High-temperature molten salt inlet; 11b. High-temperature molten salt outlet; 12. Hydrogen storage tank; 13. Metal hydride storage tank; 14. Hydrogen pipeline; 141. Hydrogen valve;

[0022] 2000, Solar thermal power generation system; 21, Heliograph; 22, Solar collector tower; 23, Steam generator; 231, Shell; 231a, Steam chamber; 232, Heat exchange pipe; 241, Steam input pipe; 242, Steam turbine; 243, Steam output pipe; 244, Generator; 245, Condenser; 246, Connecting pipe; 25, Low-temperature molten salt storage tank; 26, First molten salt pipe; 261, First molten salt valve; 27, Second molten salt pipe; 271, Second molten salt valve; 28, Third molten salt pipe; 281, Third molten salt valve; 29, Fourth molten salt pipe; 291, Fourth molten salt valve.

[0023] The realization of the objective, functional features and advantages of the present invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0024] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0025] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative positional relationship and movement of the components in a specific posture. If the specific posture changes, the directional indications will also change accordingly.

[0026] Furthermore, if the embodiments of this invention involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the use of "and / or" or "and / or" throughout the text includes three parallel solutions. For example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this invention.

[0027] This invention proposes a thermal storage device 1000 coupled with a metal hydride.

[0028] Please see Figure 1In one embodiment of the present invention, the heat storage device 1000 coupled with metal hydride includes a high-temperature molten salt storage tank 11 and a hydrogen storage tank 12. The high-temperature molten salt storage tank 11 is provided with a high-temperature molten salt inlet 11a and a high-temperature molten salt outlet 11b. A metal hydride storage tank 13 is provided inside the high-temperature molten salt storage tank 11. The metal hydride storage tank 13 is filled with metal hydride and is connected to the hydrogen storage tank 12.

[0029] In this embodiment, the metal hydride storage tank 13 is filled with metal hydrides, such as TiFeH2-based, AlH3-based, or MgH2-based metal hydrides. The metal hydride storage tank 13 is built into the molten salt storage tank and connected to the hydrogen storage tank 12. The metal hydride storage tank 13 maintains a large contact area with the molten salt in the molten salt. The molten salt tank body is equipped with molten salt pipes for the flow of the molten salt medium.

[0030] The thermal storage device 1000 coupled with metal hydride proposed in this embodiment includes a high-temperature molten salt storage tank 11 and a hydrogen storage tank 12. The high-temperature molten salt storage tank 11 is provided with a high-temperature molten salt inlet 11a and a high-temperature molten salt outlet 11b. A metal hydride storage tank 13 is provided inside the high-temperature molten salt storage tank 11. The metal hydride storage tank 13 is filled with metal hydride and is connected to the hydrogen storage tank 12. High-temperature molten salt enters the high-temperature molten salt storage tank 11 through the high-temperature molten salt inlet, heating the metal hydride storage tank 13. The metal hydride in the metal hydride storage tank 13 releases hydrogen upon heating and stores it in the hydrogen storage tank 12. When the temperature of the molten salt in the high-temperature molten salt storage tank 11 decreases, the hydrogen in the hydrogen storage tank 12 is released into the metal hydride storage tank 13. The dehydrogenated material in the metal hydride storage tank 13 absorbs the hydrogen and releases a large amount of heat, heating the molten salt in the high-temperature molten salt storage tank 11. The heated molten salt then leaves the high-temperature molten salt storage tank 11 through the high-temperature molten salt outlet. This achieves both heat storage and heat release, making it suitable for situations where peak power generation and peak power consumption do not occur simultaneously. This invention, by coupling metal hydride thermal storage technology with molten salt, combines the high thermal density of metal hydrides with the good fluidity of molten salt, improving the heat transfer and thermal storage efficiency of the thermal storage device.

[0031] Further, please refer to Figure 1 In one embodiment of the present invention, the heat storage device 1000 coupled with metal hydride further includes a hydrogen pipeline 14, which connects the metal hydride storage tank 13 and the hydrogen storage tank 12, and is equipped with a hydrogen valve 141.

[0032] In this embodiment, a hydrogen pipeline 14 is provided between the metal hydride storage tank 13 and the hydrogen storage tank 12 to allow hydrogen to flow, and a hydrogen valve 141 is provided on the hydrogen pipeline 14.

[0033] During the heat storage process, high-temperature molten salt flows into the high-temperature molten salt storage tank 11 from the high-temperature molten salt inlet 11a, heating the metal hydride storage tank 13 inside the high-temperature molten salt storage tank 11. The metal hydride in the metal hydride storage tank 13 absorbs a large amount of heat in a short time and releases a large amount of hydrogen. At this time, the hydrogen valve 141 opens, and driven by the pressure difference, the hydrogen in the metal hydride storage tank 13 flows into the hydrogen storage tank 12.

[0034] During the heat release process, when the temperature of the molten salt drops, the hydrogen valve 141 is opened, and the hydrogen in the hydrogen storage tank 12 flows into the metal hydride storage tank 13. The dehydrogenated material in the metal hydride storage tank 13 absorbs the hydrogen and releases a large amount of heat, which heats the molten salt in the molten salt storage tank.

[0035] Further, please refer to Figure 1 In one embodiment of the present invention, a plurality of metal hydride storage tanks 13 are provided in the high-temperature molten salt storage tank 11, and the plurality of metal hydride storage tanks 13 are arranged in a matrix.

[0036] In this embodiment, the high-temperature molten salt storage tank 11 contains several smaller diameter metal hydride storage tanks 13 filled with metal hydride heat storage material, arranged in a matrix. The metal hydride storage tanks 13 maintain a large contact area with the molten salt, while the individual metal hydride storage tanks 13 do not contact each other. The metal hydride storage tanks 13 are connected by hydrogen pipelines 14 and ultimately connected to a hydrogen storage tank 12. Thus, while ensuring sufficient contact and fluidity between the molten salt and the metal hydride storage tanks 13, the limited space of the high-temperature molten salt storage tank 11 allows for the placement of as many metal hydride storage tanks 13 as possible, improving the heat storage capacity and efficiency of the coupled metal hydride heat storage device 1000.

[0037] The present invention also proposes a solar thermal power generation system 2000.

[0038] Please see Figure 2 In one embodiment of the present invention, the solar thermal power generation system 2000 includes a heliostat 21, a heat collection tower 22, a heat storage device 1000 coupled with a metal hydride as described in any of the above embodiments, a steam generator 23, a generator set 244, and a low-temperature molten salt storage tank 25. The heliostat 21 is positioned facing the heat collection tower 22. The heat collection tower 22, the high-temperature molten salt storage tank 11, the steam generator 23, and the low-temperature molten salt storage tank 25 are connected in sequence. The low-temperature molten salt storage tank 25 is connected to the heat collection tower 22, and the steam generator 23 is connected to the generator set 244.

[0039] The specific structure of the thermal storage device 1000 coupled with metal hydride is as described in the above embodiments. Since the solar thermal power generation system 2000 adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be described in detail here.

[0040] In this embodiment, multiple heliostats 21 are arranged around the solar collector 22 to form a heliostat field. The heliostat field reflects sunlight to the receiver at the top of the solar collector 22, heating the molten salt passing through the solar collector 22. A low-temperature molten salt storage tank 25 and a high-temperature molten salt storage tank 11 are respectively connected to the solar collector 22. The low-temperature molten salt storage tank 25 is used to store cooled molten salt, and the high-temperature molten salt storage tank 11 is used to store molten salt heated by the solar collector 22. A metal hydride storage tank 13 is installed inside the high-temperature molten salt storage tank 11, and a hydrogen storage tank 12 is installed next to the high-temperature molten salt storage tank 11, which is connected to the metal hydride storage tank 13. A steam generator 23 is installed between the high-temperature molten salt storage tank 11 and the low-temperature molten salt storage tank 25, and the steam generator 23 is connected to both the high-temperature molten salt storage tank 11 and the low-temperature molten salt storage tank 25, thus forming a closed loop for the molten salt. Steam generator 23 is connected to generator 244 to convert thermal energy into electrical energy.

[0041] When sunlight is abundant: Sunlight enters the field of heliostat 21, is reflected, and reaches the solar collector 22. The solar collector 22 heats the molten salt, and the flowing high-temperature molten salt flows into the high-temperature molten salt storage tank 11, heating the metal hydride storage tank 13 inside. The metal hydride material in the metal hydride storage tank 13 absorbs heat and releases hydrogen gas. The hydrogen gas flows into the hydrogen storage tank 12 through the hydrogen pipeline 14. After the metal hydride storage tank 13 stops absorbing heat, the hydrogen valve 141 on the hydrogen pipeline 14 is closed. The molten salt flows into the steam generator 23 for heat exchange, generating steam. The steam drives the generator 244 sets to generate electricity. The molten salt cooled by the heat exchange in the steam generator 23 flows into the low-temperature molten salt storage tank 25, and finally flows into the solar collector 22, completing the power generation cycle.

[0042] When sunlight is limited: Sunlight enters the field of heliostat 21, is reflected, and reaches the solar collector 22. The solar collector 22 heats the molten salt. Because of the limited sunlight energy, the molten salt temperature is low. The hydrogen valve 141 is opened, allowing hydrogen from the hydrogen storage tank 12 to flow into the metal hydride storage tank 13. The dehydrogenated material in the metal hydride storage tank 13 absorbs the hydrogen and releases a large amount of heat, heating the molten salt in the hot tank. The heated molten salt then flows into the steam generator 23 for heat exchange, generating steam. The steam drives generators 244 to generate electricity. The low-temperature molten salt, after heat exchange in the steam generator 23, flows into the low-temperature molten salt storage tank 25 and finally into the solar collector 22, completing the power generation cycle.

[0043] The solar thermal power generation system 2000 of this embodiment, by setting up a heat storage device 1000 coupled with metal hydride, can store excess heat when there is sufficient sunlight and release it when there is insufficient sunlight, thus solving the supply and demand contradiction caused by the mismatch between peak power generation and peak power consumption in solar thermal power generation.

[0044] Further, please refer to Figure 2 In one embodiment of the present invention, the solar thermal power generation system 2000 further includes a first molten salt pipe 26 and a second molten salt pipe 27. The first molten salt pipe 26 is connected to the heat collection tower 22 and the high-temperature molten salt inlet 11a, and the second molten salt pipe 27 is connected to the high-temperature molten salt outlet 11b and the steam generator 23. A first molten salt valve 261 is provided on the first molten salt pipe 26, and a second molten salt valve 271 is provided on the second molten salt pipe 27.

[0045] In this embodiment, to facilitate control of the molten salt flow, a first molten salt pipe 26 for molten salt inflow and a second molten salt pipe 27 for molten salt outflow are provided on the high-temperature molten salt storage tank 11, and a first molten salt valve 261 and a second molten salt valve 271 are respectively provided on the aforementioned molten salt pipes. Thus, when molten salt flows in, the second molten salt valve 271 can be closed and the first molten salt valve 261 can be opened to allow the molten salt to submerge the metal hydride storage tank 13, so that the metal hydride storage tank 13 can fully contact the molten salt.

[0046] Further, please refer to Figure 2 In one embodiment of the present invention, the steam generator 23 includes a housing 231 and a heat exchange pipe 232. A steam chamber 231a is formed inside the housing 231, and the steam chamber 231a contains a heat exchange liquid. The heat exchange pipe 232 enters the steam chamber 231a from the outer wall of the housing 231 and exits the housing 231 from the inner wall of the steam chamber 231a. The inlet of the heat exchange pipe 232 is connected to the second molten salt pipe 27, and the outlet of the heat exchange pipe 232 is connected to the low-temperature molten salt storage tank 25.

[0047] In this embodiment, water is typically used as the heat exchange fluid. The inlet of the heat exchange pipe 232 is connected to the second molten salt pipe 27, and the outlet of the heat exchange pipe 232 is connected to the low-temperature molten salt storage tank 25. Therefore, the molten salt flows within the heat exchange pipe 232 without directly contacting the heat exchange fluid. The heat exchange pipe 232 is configured as a bend or coil to increase the heat exchange area and improve heat exchange efficiency.

[0048] Furthermore, for purposes such as flow control, system isolation, and backflow prevention, please refer to [link to relevant documentation]. Figure 2 In one embodiment of the present invention, the solar thermal power generation system 2000 further includes a third molten salt pipe 28 and a fourth molten salt pipe 29. The third molten salt pipe 28 is connected to the outlet of the heat exchange pipe 232 and the low-temperature molten salt storage tank 25. The fourth molten salt pipe 29 is connected to the low-temperature molten salt storage tank 25 and the heat collection tower 22. A third molten salt valve 281 is provided on the third molten salt pipe 28 and a fourth molten salt valve 291 is provided on the fourth molten salt pipe 29.

[0049] Further, please refer to Figure 2In one embodiment of the present invention, the generator 244 group includes a steam input pipe 241, a steam turbine 242, a steam output pipe 243 and a generator 244. The steam input pipe 241 connects the steam chamber 231a and the steam input port of the steam turbine 242. The steam output pipe 243 connects the steam output port of the steam turbine 242 and the steam chamber 231a. The generator 244 is connected to the output shaft of the steam turbine 242.

[0050] In this embodiment, when the high-temperature molten salt flows into the steam generator 23 for heat exchange, the generated steam enters the steam turbine 242 through the steam input pipe 241 and drives the steam turbine 242. The steam turbine 242 then drives the generator 244 to generate electricity. After passing through the steam turbine 242, the steam cools down and flows back to the steam generator 23 through the steam output pipe 243, completing the steam cycle.

[0051] For further details, please refer to Figure 2 In one embodiment of the present invention, the generator set 244 further includes a condenser 245 and a connecting pipe 246, with the steam output pipe 243, condenser 245, connecting pipe 246, and steam chamber 231a connected in sequence. Since the steam cools down after passing through the turbine 242, it still retains a certain temperature. Therefore, a condenser 245 is installed downstream of the turbine 242. The condenser 245 can recover and utilize the heat from the condensate, reducing the amount of fuel required for boiler heating of feedwater and thus reducing energy consumption.

[0052] Furthermore, to improve the heat collection efficiency of the heat collection tower 22, please refer to... Figure 2 In one embodiment of the present invention, the concentrated solar power (CSP) system 2000 includes a plurality of heliostats 21 arranged circumferentially along a solar collector tower 22. The plurality of heliostats 21 surround the solar collector tower 22, forming a heliostat field. This field reflects sunlight to an absorber at the top of the solar collector tower 22, heating the molten salt passing through the tower.

[0053] The following provides a specific embodiment of the solar thermal power generation system 2000 of the present invention, in conjunction with the thermal storage device 1000 coupled with metal hydrides proposed in the present invention:

[0054] Example 1:

[0055] Taking a 10MW solar thermal power generation system 2000 coupled with the aforementioned molten salt metal hydride thermal storage device as an example, the thermoelectric conversion efficiency is 45%, the thermal storage time is 8 hours, the molten salt is composed of 60% NaNO3 and 40% KNO3, the heat collection tower 22 heats the molten salt to 565℃, and after heat exchange by the steam generator 23, the molten salt temperature drops to 290℃, the unit molten salt thermal storage density is 0.42MJ / kg, and the total thermal storage capacity requirement is 178MWh, or 640800MJ. If only molten salt is used as the thermal storage medium, 1526 tons are needed, based on the density of liquid molten salt (1850kg / m³). 3 It can be determined that the required volume of molten salt is 825m³. 3 The thermal storage density of metal hydride thermal storage materials is approximately 1.5 MJ / kg. If a molten salt thermal storage device coupled with metal hydrides is used, the total thermal storage of the metal hydrides is 240,800 MJ. Using Mg2FeH6 material, the material density is 2760 kg / m³. 3 This would require approximately 160.5 tons of thermal storage material, with a material volume of 60 cubic meters. 3 The molten salt stores 400,000 MJ of heat, requiring 952.4 t of molten salt. Based on the density of liquid molten salt (1850 kg / m³),... 3 It can be seen that only a molten salt volume of 515m³ is required. 3 Therefore, in the aforementioned concentrated solar power (CSP) system 2000, the outer diameter of the high-temperature molten salt storage tank 11 is designed to be 4.36m, and its length is 10m. The outer diameter of the molten salt cold tank is designed to be 4.29m, and its length is 9m. Thirty metal hydride storage tanks 13, each with an outer diameter of 0.3m and a length of 8m, are inserted inside the high-temperature molten salt storage tank 11. The metal hydride storage tanks 13 are interconnected by hydrogen pipelines, and ultimately connected to a system with a volume of 250m³. 3 Connect to the 35MPa hydrogen tank.

[0056] The above description is merely an exemplary embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural transformations made using the contents of the present invention specification and drawings under the technical concept of the present invention, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present invention.

Claims

1. A thermal storage device coupled with a metal hydride, characterized in that, The thermal storage device coupled with metal hydrides includes a high-temperature molten salt storage tank (11) and a hydrogen storage tank (12); The high-temperature molten salt storage tank (11) is provided with a high-temperature molten salt inlet (11a) and a high-temperature molten salt outlet (11b). The high-temperature molten salt storage tank (11) is provided with a metal hydride storage tank (13), which is filled with metal hydride. The metal hydride storage tank (13) is connected to the hydrogen storage tank (12).

2. The thermal storage device coupled with a metal hydride as described in claim 1, characterized in that, The thermal storage device coupled with metal hydride also includes a hydrogen pipeline (14), which connects the metal hydride storage tank (13) and the hydrogen storage tank (12), and a hydrogen valve (141) is provided on the hydrogen pipeline (14).

3. The thermal storage device coupled with a metal hydride as described in claim 1, characterized in that, The high-temperature molten salt storage tank (11) is equipped with a plurality of metal hydride storage tanks (13), which are arranged in a matrix.

4. A concentrated solar power generation system, characterized in that, The solar thermal power generation system includes a heliostat (21), a heat collection tower (22), a heat storage device coupled with metal hydride as described in any one of claims 1 to 3, a steam generator (23), a generator set, and a low-temperature molten salt storage tank (25); The heliostat (21) is positioned facing the solar collector (22). The solar collector (22), the high-temperature molten salt storage tank (11), the steam generator (23), and the low-temperature molten salt storage tank (25) are connected in sequence. The low-temperature molten salt storage tank (25) is connected to the solar collector (22). The steam generator (23) is connected to the generator set.

5. The solar thermal power generation system as described in claim 4, characterized in that, The solar thermal power generation system also includes a first molten salt pipe (26) and a second molten salt pipe (27). The first molten salt pipe (26) is connected to the solar collector tower (22) and the high-temperature molten salt inlet (11a). The second molten salt pipe (27) is connected to the high-temperature molten salt outlet (11b) and the steam generator (23). The first molten salt pipe (26) is provided with a first molten salt valve (261), and the second molten salt pipe (27) is provided with a second molten salt valve (271).

6. The solar thermal power generation system as described in claim 5, characterized in that, The steam generator (23) includes a housing (231) and a heat exchange pipe (232). A steam chamber (231a) is formed inside the housing (231), and the steam chamber (231a) contains a heat exchange liquid. The heat exchange pipe (232) enters the steam chamber (231a) from the outer wall of the shell (231) and exits the shell (231) from the inner wall of the steam chamber (231a); The inlet of the heat exchange pipe (232) is connected to the second molten salt pipe (27), and the outlet of the heat exchange pipe (232) is connected to the low-temperature molten salt storage tank (25).

7. The solar thermal power generation system as described in claim 6, characterized in that, The solar thermal power generation system also includes a third molten salt pipe (28) and a fourth molten salt pipe (29). The third molten salt pipe (28) is connected to the outlet of the heat exchange pipe (232) and the low-temperature molten salt storage tank (25). The fourth molten salt pipe (29) is connected to the low-temperature molten salt storage tank (25) and the solar collector tower (22). The third molten salt pipe (28) is provided with a third molten salt valve (281), and the fourth molten salt pipe (29) is provided with a fourth molten salt valve (291).

8. The solar thermal power generation system as described in claim 6, characterized in that, The generator set includes a steam inlet pipe (241), a steam turbine (242), a steam outlet pipe (243), and a generator (244); The steam input pipe (241) connects the steam chamber (231a) to the steam input port of the steam turbine (242), and the steam output pipe (243) connects the steam output port of the steam turbine (242) to the steam chamber (231a); The generator (244) is connected to the output shaft of the steam turbine (242).

9. The solar thermal power generation system as described in claim 8, characterized in that, The generator set also includes a condenser (245) and a connecting pipe (246), and the steam output pipe (243), the condenser (245), the connecting pipe (246) and the steam chamber (231a) are connected in sequence.

10. The solar thermal power generation system as described in claim 4, characterized in that, The solar thermal power generation system includes a plurality of heliostats (21), which are arranged circumferentially along the solar collector tower (22).

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