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CN-121993906-A - Heat storage device coupled with metal hydride and photo-thermal power generation system

CN121993906ACN 121993906 ACN121993906 ACN 121993906ACN-121993906-A

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 of the coupling metal hydride comprises a high-temperature molten salt storage tank and a hydrogen storage tank, wherein the high-temperature molten salt storage tank is provided with a high-temperature molten salt input port and a high-temperature molten salt output port, a metal hydride storage tank is arranged in the high-temperature molten salt storage tank, metal hydride is filled in the metal hydride storage tank, and the metal hydride storage tank is communicated with the hydrogen storage tank. The high-temperature molten salt heats the metal hydride in the metal hydride storage tank to heat the metal hydride to release hydrogen and store the hydrogen in the hydrogen storage tank. After the temperature of the fused salt is reduced, releasing hydrogen of the hydrogen storage tank to the metal hydride storage tank so that the dehydrogenated material absorbs the hydrogen and releases heat, and heating the fused salt in the high-temperature fused salt storage tank, thereby realizing heat storage and heat release. The heat storage device and the method have the advantages that the heat transfer property and the heat storage efficiency of the heat storage device are improved by combining the high heat storage density of the metal hydride and the good fluidity of the molten salt.

Inventors

  • LIU HUANG
  • CHU PAN
  • ZHAO YU
  • YANG WEI
  • REN CHANGXIANG

Assignees

  • 中石油深圳新能源研究院有限公司
  • 中国石油天然气股份有限公司

Dates

Publication Date
20260508
Application Date
20241101

Claims (10)

  1. 1. A metal hydride coupled heat storage device, characterized in that the metal hydride coupled heat storage device comprises 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 input port (11 a) and a high-temperature molten salt output port (11 b), a metal hydride storage tank (13) is arranged in the high-temperature molten salt storage tank (11), and metal hydride is filled in the metal hydride storage tank (13); the metal hydride storage tank (13) is in communication with the hydrogen storage tank (12).
  2. 2. The heat storage device of the coupling metal hydride according to claim 1, further comprising a hydrogen pipe (14), wherein the hydrogen pipe (14) connects the metal hydride storage tank (13) and the hydrogen storage tank (12), and a hydrogen valve (141) is provided on the hydrogen pipe (14).
  3. 3. The heat storage device coupled with metal hydrides according to claim 1, wherein a plurality of the metal hydride storage tanks (13) are arranged in the high-temperature molten salt storage tank (11), and the plurality of the metal hydride storage tanks (13) are distributed in a matrix.
  4. 4. A photo-thermal power generation system, characterized in that it comprises heliostats (21), a thermal-collecting tower (22), a heat storage device of a coupling metal hydride according to any 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 arranged towards 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 sequentially communicated, and the low-temperature molten salt storage tank (25) is communicated with the heat collection tower (22); The steam generator (23) is in communication with the generator set.
  5. 5. The photo-thermal power generation system according to claim 4, further comprising a first molten salt pipe (26) and a second molten salt pipe (27), the first molten salt pipe (26) communicating the heat collecting tower (22) with the high temperature molten salt input port (11 a), the second molten salt pipe (27) communicating the high temperature molten salt output port (11 b) with 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. 6. The photo-thermal power generation system according to claim 5, wherein the steam generator (23) includes a housing (231) and a heat exchange tube (232), a steam chamber (231 a) is formed in the housing (231), and the steam chamber (231 a) accommodates a heat exchange liquid; the heat exchange pipe (232) penetrates the steam cavity (231 a) from the outer wall of the housing (231) and penetrates the housing (231) from the inner wall of the steam cavity (231 a); An input port of the heat exchange pipeline (232) is communicated with the second molten salt pipe (27), and an output port of the heat exchange pipeline (232) is communicated with the low-temperature molten salt storage tank (25).
  7. 7. The photo-thermal power generation system as defined in claim 6, further comprising a third molten salt pipe (28) and a fourth molten salt pipe (29), the third molten salt pipe (28) communicating an output port of the heat exchange pipe (232) with the low-temperature molten salt storage tank (25), the fourth molten salt pipe (29) communicating the low-temperature molten salt storage tank (25) with the heat collecting tower (22); And a third molten salt valve (281) is arranged on the third molten salt pipe (28), and a fourth molten salt valve (291) is arranged on the fourth molten salt pipe (29).
  8. 8. The photo-thermal power generation system as defined in claim 6, wherein the power generation unit comprises a steam input pipe (241), a steam turbine (242), a steam output pipe (243), and a generator (244); The steam input pipe (241) is communicated with the steam cavity (231 a) and the steam input port of the steam turbine (242), and the steam output pipe (243) is communicated with the steam output port of the steam turbine (242) and the steam cavity (231 a); The generator (244) is connected to an output shaft of the turbine (242).
  9. 9. The photothermal power generation system of claim 8, wherein the generator set further comprises a condenser (245) and a communication pipe (246), the steam output pipe (243), the condenser (245), the communication pipe (246), and the steam chamber (231 a) being in communication in this order.
  10. 10. The photo-thermal power generation system according to claim 4, characterized in that the photo-thermal power generation system comprises a plurality of the heliostats (21), the heliostats (21) being arranged along the circumference of the heat collection tower (22).

Description

Heat storage device coupled with metal hydride and photo-thermal power generation system Technical Field The invention relates to the technical field of energy storage, in particular to a heat storage device coupled with metal hydride and a photo-thermal power generation system. Background Under the background of continuous rising global energy demands and continuous increasing environmental protection pressure, the development and utilization of renewable energy have become an important trend of global energy transformation. Solar energy has received extensive attention and research as a clean, renewable energy source. The photo-thermal power generation technology is used as an efficient solar energy utilization mode, and working medium is heated by focusing heat energy of sunlight, so that power generation equipment is driven to generate electric energy. However, the power generation efficiency of photo-thermal power generation is greatly affected by environmental factors, which cannot realize all-weather smooth power generation, and can be operated efficiently only in a sunny period. Unfortunately, this peak power generation period often does not match the peak power usage period of the grid, and even an excess of power occurs during the grid load off-peak period, resulting in wasted power curtailment. In the peak load period of the power grid, the photo-thermal power generation is in a valley, and sufficient power support cannot be provided for the power grid, so that supply and demand contradiction is caused. The intermittent and unstable nature of solar energy causes a discontinuity in the energy supply, and therefore, research and coupling of heat storage devices to balance the energy supply and demand have become a central topic in the field of photo-thermal power generation. Metal hydride heat storage technology has been attracting attention due to its high heat storage density and excellent thermal cycle performance. In this technology, the metal hydride can release hydrogen when absorbing heat, this process is called dehydrogenation, whereas the dehydrogenated metal hydride can release heat after reabsorbing hydrogen, thereby realizing high-efficiency energy conversion. It is notable that the metal hydride remains solid throughout the heat storage and release process, which limits the flow and transfer of heat, resulting in low heat storage efficiency and poor heat transfer of the heat storage device. Disclosure of Invention The invention mainly aims to provide a heat storage device coupled with metal hydride and a photo-thermal power generation system, and aims to solve the problems that the metal hydride is always kept in a solid state in the heat storage and release processes, so that the flow and the transfer of heat are limited, the heat storage efficiency is low and the heat transfer performance is poor. In order to achieve the above purpose, the heat storage device for coupling metal hydrides provided by the invention comprises a high-temperature molten salt storage tank and a hydrogen storage tank, wherein the high-temperature molten salt storage tank is provided with a high-temperature molten salt input port and a high-temperature molten salt output port, the high-temperature molten salt storage tank is internally provided with a metal hydride storage tank, the metal hydride storage tank is filled with metal hydrides, and the metal hydride storage tank is communicated with the hydrogen storage tank. In an embodiment, the heat storage device coupled with the metal hydride further comprises a hydrogen pipeline, the hydrogen pipeline is connected with the metal hydride storage tank and the hydrogen storage tank, and a hydrogen valve is arranged on the hydrogen pipeline. In an embodiment, a plurality of metal hydride storage tanks are arranged in the high-temperature molten salt storage tank, and the plurality of metal hydride storage tanks are distributed in a matrix mode. The invention also provides a photo-thermal power generation system which comprises a heliostat, a heat collection tower, the heat storage device of the coupling metal hydride, a steam generator, a generator set and a low-temperature molten salt storage tank, wherein the heliostat is arranged towards the heat collection tower, the high-temperature molten salt storage tank, the steam generator and the low-temperature molten salt storage tank are sequentially communicated, the low-temperature molten salt storage tank is communicated with the heat collection tower, and the steam generator is communicated with the generator set. In an embodiment, the photo-thermal power generation system further comprises a first molten salt pipe and a second molten salt pipe, the first molten salt pipe is communicated with the heat collecting tower and the high-temperature molten salt input port, the second molten salt pipe is communicated with the high-temperature molten salt output port and the steam generator, a first molten salt valve is