Integrated energy storage equipment for storing and releasing heat

Abstract

The utility model belongs to the technical field of heat mass energy storage, and discloses heat mass storage and release integrated energy storage equipment, which comprises a heat storage and release integrated tank, a heating U-shaped calandria and a heat exchange U-shaped calandria are alternately arranged in the heat storage and release integrated tank in a staggered manner, and the heating U-shaped calandria is used for heating heat mass fused salt or heat conduction oil stored in the tank. The utility model has the following beneficial effects: the steam turbine and the generator are integrated by adopting modularization, molten salt and heat conduction oil do not need to be pumped out for heat exchange and power generation, heat exchange is directly completed in the equipment, and the heat energy loss is reduced. And parts are reduced, and faults are reduced. And a plurality of modules of the storage and generation integrated tank can be combined according to the energy storage capacity. The method is not affected by sites and is low in overall construction investment cost.

Description

Technical Field

[0001] This utility model belongs to the field of thermal mass storage technology, and specifically relates to an integrated energy storage device for storing and releasing thermal mass. Background Technology

[0002] At a critical juncture in the global energy transition, innovation in energy storage technology has become a core driving force for the development of sustainable energy. The gradual depletion of traditional fossil fuels and environmental pollution problems have made renewable energy sources such as solar and wind power ideal alternatives. However, these renewable energy sources are constrained by natural conditions, exhibiting significant intermittency and instability, which hinders their widespread application in the energy market. Thermal mass storage technology, as an important way to overcome this predicament, has attracted much attention. Thermal mass storage is a technology that utilizes the sensible or latent heat properties of materials to store and release thermal energy.

[0003] Currently, thermal mass flow (TMF) energy storage requires high initial investment, stringent site requirements, and large land area. Parts supply is incomplete. Daily maintenance of molten salt pipelines is demanding. At low temperatures, the potassium nitrate mixed with molten salt inside the pipelines can cause crystallization and blockage of the heat transfer oil, leading to high system operation and maintenance costs. The construction and installation of TMF tanks and heat exchangers are complex and time-consuming. Once installed, the equipment cannot be moved or used modularly. Lithium-ion battery energy storage is expensive and prone to fire hazards.

[0004] In view of this, this application proposes an integrated energy storage device for storing and releasing heat, in order to solve the above problems. Utility Model Content

[0005] To address the shortcomings of existing technologies, the purpose of this invention is to provide an integrated energy storage device for storing and releasing heat. This device employs modular design to integrate the steam turbine and generator, eliminating the need to extract molten salt or heat transfer oil for heat exchange and thus reducing heat loss. It also prevents blockage of pipelines after the molten salt or heat transfer oil cools down. The integrated storage and generation effectively reduces heat loss and improves overall conversion efficiency. Fewer parts reduce malfunctions. Multiple modules of the integrated storage and generation tank can be combined according to the required energy storage capacity. It is not affected by site conditions, has low overall construction investment costs, and solves the problems mentioned in the background technology.

[0006] To achieve the above objectives, this application specifically adopts the following technical solution:

[0007] An integrated thermal power generation and storage system includes: an integrated storage and storage tank, which contains alternating, staggered heating U-shaped pipes and heat exchange U-shaped pipes. The heating U-shaped pipes are used to heat molten salt or thermal oil stored in the tank. The heat exchange U-shaped pipes are connected to a steam power generation assembly via a multi-stage heat exchange unit. The multi-stage heat exchange unit includes a cold water tank, a hot water tank, a secondary heating tank, a high-temperature steam tank, a secondary heating steam tank, and a high-temperature, high-pressure steam tank, all installed on one side of the integrated storage and storage tank, forming a heat exchange loop with the integrated storage and storage tank through the heat exchange U-shaped pipes. The steam power generation assembly includes a high-pressure steam turbine and a low-pressure steam turbine. The high-pressure steam turbine is connected to a solenoid valve via a high-temperature, high-pressure steam pipeline, and the solenoid valve is connected to the high-temperature, high-pressure steam tank. The low-pressure steam turbine is connected to the high-pressure steam turbine via a low-pressure steam pipeline to receive exhaust steam. The high-pressure steam turbine and the low-pressure steam turbine are respectively connected to generator one and generator two. The circulating pipeline system includes a water storage tank, a water pump, and a steam condenser. The steam condenser is connected to a connecting pipe 2 via a cooling water pipe inside the condenser. The connecting pipe 2 is connected to the water storage tank to restore the steam after work to a liquid state and return it to the water storage tank.

[0008] In a preferred embodiment, a sensor array is installed on one side of the integrated storage and generation tank. The sensor array includes: three temperature sensors to monitor the temperature in different areas of the tank in real time; a level sensor to detect the amount of calorific value stored in the tank; and a pressure sensor connected to a heating U-shaped manifold to monitor the working pressure. The sensor array is electrically connected to a controller to implement safety threshold warnings. The solenoid valve is an intelligent regulating valve and is electrically connected to the controller.

[0009] In a preferred embodiment, a water-vapor separator is installed on one side of the integrated storage and generation tank. The high-temperature steam box, the secondary heating steam box, and the hot water box are connected to the water-vapor separator through pipelines. The low-pressure steam turbine is connected to the steam condenser through a steam pipe. The secondary heating box is connected to the hot water box through a connecting pipe. The separated liquid water returns to the cold water box through pipelines, and the dried steam enters the secondary heating steam box through pipelines for reheating.

[0010] In a preferred embodiment, the water pump is connected to the cold water tank via an inlet pipe and to the storage tank via a pumping pipe. Both the cold water tank and the secondary heating steam tank are equipped with heat exchange U-shaped pipe inlets, and the hot water tank, the high-temperature steam tank, and the high-temperature and high-pressure steam tank are equipped with heat exchange U-shaped pipe outlets.

[0011] In a preferred embodiment, the integrated storage and generation tank, generator one, generator two, water pump, water storage tank, steam condenser, high-pressure steam turbine, and low-pressure steam turbine are all fixed on the bottom tray, and the bottom tray is fixedly connected to the integrated storage and generation tank through a tank support frame.

[0012] In a preferred embodiment, the integrated energy storage and power generation tank is covered with a ceramic fiber insulation layer, and the integrated energy storage and power generation tank is installed inside the outer shell of the energy storage station. A heat dissipation window is provided on one side of the outer shell of the energy storage station to correspond to the heat dissipation surfaces of generator one and generator two.

[0013] In a preferred embodiment, the heating U-shaped pipe and the heat exchange U-shaped pipe are arranged in a three-dimensional spiral staggered arrangement inside the integrated storage and generation tank, with the adjacent spacing being 1.5-2 times the pipe diameter.

[0014] As a preferred embodiment, the energy storage station integrates an AI control system within its outer shell, enabling remote monitoring and coordinated scheduling of the system via a wireless communication module.

[0015] After adopting the above technical solution, the beneficial effects of this utility model are:

[0016] 1. By laying heat exchange U-shaped pipes inside the integrated energy storage tank, it is unnecessary to extract the potassium nitrate mixed molten salt or heat transfer oil for heat exchange, reducing heat loss and malfunctions. The heating and heat exchange U-shaped pipes are laid alternately and staggered within the integrated energy storage tank, enabling the heating of molten salt and heat exchange to be completed within the tank itself. Compared to existing technologies that require pouring the molten salt out and transporting it to the heat exchanger for heat transfer, this method directly avoids the cooling and blockage of pipes during the extraction of molten salt and heat transfer oil, which can lead to malfunctions. The molten salt and heat transfer oil can exchange heat through the heat exchange U-shaped pipes within the tank, eliminating the need for extraction via a traditional molten salt pump and heat exchanger, saving steps, reducing heat loss, and improving thermal storage efficiency. Integrating the hot water tank, water-vapor separator, steam tank, and energy storage tank into the integrated tank reduces piping in the water heat exchange process, increasing heat exchange efficiency. No additional heat exchanger is required, simplifying the heat exchange process. Steam drives a generator after passing through a high-pressure steam turbine, and the remaining heat energy is used for secondary work through a low-pressure steam turbine, effectively improving steam utilization efficiency. Furthermore, the thermal storage tank is wrapped with ceramic fiber for insulation, effectively preventing heat loss and improving energy storage conversion efficiency.

[0017] 2. The energy storage heat exchange tank, steam turbine, generator, condenser, and water tank are integrated into a modular unit via a bottom tray. Utilizing intelligent AI remote control for energy storage and discharge, multiple modules can be combined according to the required energy storage capacity and power consumption, enabling rapid production and assembly. This allows factories, industrial parks, and wind and solar power farms to quickly commence operations, reducing equipment installation time. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of this utility model 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 this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of the overall structure of an integrated energy storage device for storing and releasing heat, according to the present invention.

[0020] Figure 2 This is a structural schematic diagram of the integrated energy storage device for storing and releasing heat according to the present invention, shown in the left view and left cross-sectional view.

[0021] Figure 3 This is a right-side structural schematic diagram of an integrated energy storage device for storing and releasing heat according to this utility model.

[0022] Figure 4 This is a top view of the internal structure of an integrated energy storage device for storing and releasing heat, according to this utility model.

[0023] Figure 5 This is a side cross-sectional view of the integrated energy storage device for storing and releasing heat according to the present invention.

[0024] Figure 6 This is a side view of the integrated energy storage device for storing and releasing heat according to this utility model.

[0025] Figure 7 This is a schematic diagram of the structure of the outer shell of the energy storage station in an integrated energy storage device for storing and releasing heat and mass according to this utility model.

[0026] In the diagram: 1. Integrated storage and generation tank; 2. Solenoid valve; 3. High-temperature and high-pressure steam pipeline; 4. High-pressure steam turbine; 5. Low-pressure steam pipeline; 6. Generator 1; 7. Generator 2; 8. Low-pressure steam turbine; 9. Steam pipeline 1; 10. Steam condenser; 11. Water storage tank; 12. Water pump; 13. Inlet pipe; 14. Temperature sensor; 15. Liquid level sensor; 16. Temperature sensor; 17. Pressure sensor; 18. Temperature sensor; 19. Water-vapor separator; 20. Cold water tank; 21. Hot water tank; 22. Secondary heating tank; 23. High-temperature... 24. Steam box; 25. Secondary heating steam box; 26. High temperature and high pressure steam box; 27. Connecting pipe one; 28. Heat exchange U-shaped pipe inlet; 29. ​​Heat exchange U-shaped pipe outlet; 30. Heat exchange U-shaped pipe inlet; 31. Heat exchange U-shaped pipe inlet; 32. Heat exchange U-shaped pipe outlet; 33. Heating U-shaped pipe; 34. Heat exchange U-shaped pipe; 35. Cooling water pipe inside the condenser; 36. Connecting pipe two; 37. Tank support frame; 38. Bottom tray; 39. Ceramic fiber insulation layer; 40. Heat dissipation window; 41. Energy storage station shell. Detailed Implementation

[0027] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0028] Please see Figures 1 to 7A thermal power generation system integrating energy storage and generation includes: an integrated energy storage tank 1, which has alternating heating U-shaped pipes 33 and heat exchange U-shaped pipes 34 inside. The heating U-shaped pipes 33 are used to heat the hot molten salt or thermal oil stored in the tank. The heat exchange U-shaped pipes 34 are connected to a steam power generation component through a multi-stage heat exchange unit. The multi-stage heat exchange unit includes a cold water tank 20, a hot water tank 21, a secondary heating tank 22, a high-temperature steam tank 23, a secondary heating steam tank 24, and a high-temperature and high-pressure steam tank 25 installed on one side of the integrated energy storage tank 1, and forms a heat exchange loop with the integrated energy storage tank 1 through the heat exchange U-shaped pipes 34. The steam power generation unit includes a high-pressure steam turbine 4 and a low-pressure steam turbine 8. The high-pressure steam turbine 4 is connected to a solenoid valve 2 via a high-temperature, high-pressure steam pipe 3, and the solenoid valve 2 is connected to a high-temperature, high-pressure steam tank 25. The low-pressure steam turbine 8 is connected to the high-pressure steam turbine 4 via a low-pressure steam pipe 5 to receive exhaust steam. The high-pressure steam turbine 4 and the low-pressure steam turbine 8 are respectively connected to generator 6 and generator 7. The circulation pipeline system includes a water storage tank 11, a water pump 12, and a steam condenser 10. The steam condenser 10 is connected to a connecting pipe 36 via a cooling water pipe 35 inside the condenser. The connecting pipe 36 is connected to the water storage tank 11 to restore the steam after work to a liquid state and return it to the water storage tank 11.

[0029] A sensor array is installed on one side of the integrated storage and generation tank 1. The sensor array includes three temperature sensors (14, 16, and 18) to monitor the temperature in different areas of the tank in real time. A level sensor 15 detects the amount of calorific value stored in the tank. A pressure sensor 17 is connected to the heating U-shaped manifold 33 to monitor the working pressure. The sensor array is electrically connected to the controller to provide safety threshold warnings. The solenoid valve 2 is an intelligent regulating valve and is electrically connected to the controller.

[0030] A water-vapor separator 19 is installed on one side of the integrated storage and generation tank 1. The high-temperature steam box 23, the secondary heating steam box 24, and the hot water box 21 are connected to the water-vapor separator 19 through pipelines. The low-pressure steam turbine 8 is connected to the steam condenser 10 through the steam pipe 9. The secondary heating box 22 is connected to the hot water box 21 through the connecting pipe 26. The separated liquid water returns to the cold water box 20 through pipelines, and the dry steam enters the secondary heating steam box 24 through pipelines for reheating.

[0031] The water pump 12 is connected to the cold water tank 20 through the water inlet pipe 13 and to the water storage tank 11 through the water pumping pipe. The cold water tank 20 and the secondary heating steam tank 24 are equipped with heat exchange U-shaped pipe inlets 27, 29, and 31. The hot water tank 21, the high temperature steam tank 23, and the high temperature and high pressure steam tank 25 are equipped with heat exchange U-shaped pipe outlets 28, 30, and 32.

[0032] The integrated storage and generation tank 1, generator 1 6, generator 2 7, water pump 12, water storage tank 11, steam condenser 10, high-pressure steam turbine 4 and low-pressure steam turbine 8 are all fixed on the bottom tray 38, and the bottom tray 38 is fixedly connected to the integrated storage and generation tank 1 through the tank support frame 37.

[0033] The outer surface of the integrated energy storage and power generation tank 1 is covered with a ceramic fiber insulation layer 39. The integrated energy storage and power generation tank 1 is installed inside the outer shell 41 of the energy storage station. A heat dissipation window 40 is provided on one side of the outer shell 41 of the energy storage station to correspond to the heat dissipation surface of generator 1 6 and generator 2 7.

[0034] The heating U-shaped pipe 33 and the heat exchange U-shaped pipe 34 are arranged in a three-dimensional spiral staggered arrangement in the integrated storage and generation tank 1, with the adjacent spacing being 1.5-2 times the pipe diameter.

[0035] The energy storage station's outer shell 41 integrates an AI control system, which enables remote monitoring and coordinated scheduling of the equipment through a wireless communication module.

[0036] In practical use, the working principle of this utility model is as follows:

[0037] U-shaped heat exchange pipes 34 are installed inside the integrated storage and generation tank 1 to exchange heat with the heat and mass inside the tank. The heating U-shaped pipes 33 and the heat exchange U-shaped pipes 34 are staggered in layers inside the integrated storage and generation tank 1. Water or carbon dioxide is pumped from the water storage tank 11 to the cold water tank 20 of the integrated storage and generation tank 1 by the water pump 12. The water enters the heat exchange tank through the inlet 27 of the heat exchange U-shaped pipe and exits through the heat exchange U-shaped pipe 28 to the hot water tank 21. The hot water in the hot water tank 21 then enters the secondary heating tank 22 through the connecting pipe 26. The hot water enters the secondary heating tank 22 through the inlet 29 of the heat exchange U-shaped pipe to be heated to generate steam, and enters the high-temperature steam tank 23 through the outlet 30 of the heat exchange U-shaped pipe. The steam in the high-temperature steam tank 23 passes through the water-steam separator 19 to separate the water from the steam. The separated water flows into the cold water tank 20 through the lower pipe. The high-temperature steam enters the secondary heating steam tank 24, and after being heated by the heat exchange U-shaped pipe, it enters the high-temperature and high-pressure steam tank 25. Steam in the high-temperature, high-pressure steam tank 25 has its flow rate controlled by solenoid valve 2. After passing through solenoid valve 2, the high-temperature, high-pressure steam enters the high-pressure steam turbine 4 via the high-temperature, high-pressure steam pipeline 3, driving generator 6 to generate electricity. The steam after performing work enters the low-pressure steam turbine 8 via the low-pressure steam pipeline 5, performing work again to drive generator 7 to generate electricity. The steam after secondary use enters the condenser 10 via steam pipeline 9, where it is cooled by the condenser cooling water pipe 35. The condensed water flows into the water storage tank 11 via connecting pipe 36. A ceramic fiber insulation layer 39 insulates the integrated energy storage and generation tank 1 to prevent heat loss. Heat dissipation windows 40 are used to cool generator 6 and generator 7. The energy storage station casing 41 protects the internal modules from weather and environmental interference. The system is ready for immediate use upon arrival at the site.

[0038] This modularizes and automates the entire energy storage system, eliminating the need for dedicated personnel to manage it throughout the process. Multiple modules can be combined to meet customized power requirements based on the energy storage capacity. A mixture of 60% NaNO3 (sodium nitrate) and 40% KNO3 (potassium nitrate) or thermal oil is used as the heat transfer medium. Water or supercritical carbon dioxide is used as the working fluid for both the high-pressure steam turbine 4 and the low-pressure steam turbine 8.

[0039] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. An integrated thermal energy storage and release device for storing and releasing a thermal mass, characterized by, It comprises: The integrated storage and generation tank (1) and the multi-stage heat exchange unit, the integrated storage and generation tank (1) is internally provided with alternately staggered heating U-shaped pipes (33) and heat exchange U-shaped pipes (34), the heating U-shaped pipes (33) are used for heating hot mass molten salt or heat conducting oil stored in the tank; The multi-stage heat exchange unit forms a heat exchange loop with the integrated storage and generation tank (1) through the heat exchange U-shaped pipes (34).

2. An integrated thermal mass storage and release device according to claim 1, wherein: The multi-stage heat exchange unit comprises a cold water tank (20), a hot water tank (21), a secondary heating tank (22), a high-temperature steam tank (23), a secondary heating steam tank (24) and a high-temperature high-pressure steam tank (25) installed on one side of the integrated storage and generation tank (1), and the heat exchange U-shaped pipes (34) are communicated with a steam power generation assembly through the multi-stage heat exchange unit.

3. An integrated thermal mass storage and release device according to claim 2, wherein: The steam power generation assembly comprises a high-pressure steam turbine (4) and a low-pressure steam turbine (8), the high-pressure steam turbine (4) is connected with an electromagnetic valve (2) through a high-temperature high-pressure steam pipeline (3), the electromagnetic valve (2) is connected with the high-temperature high-pressure steam tank (25), the low-pressure steam turbine (8) receives exhaust steam through a low-pressure steam pipeline (5) connected with the high-pressure steam turbine (4), and the high-pressure steam turbine (4) and the low-pressure steam turbine (8) are respectively connected with a first generator (6) and a second generator (7).

4. An integrated thermal mass storage and release device according to claim 3, wherein: It also comprises a circulating pipeline system, the circulating pipeline system comprises a water storage tank (11), a water pump (12) and a steam condenser (10), the steam condenser (10) is connected with a communication pipe two (36) through a condenser internal cooling water pipe (35), and the communication pipe two (36) is connected with the water storage tank (11) to restore the steam after work to liquid state and return to the water storage tank (11).

5. An integrated thermal mass storage and release device according to claim 3, wherein: A sensor group is installed on one side of the integrated storage and generation tank (1), and the sensor group comprises: Temperature sensors (14, 16 and 18) are provided in three groups and are used for monitoring the temperatures of different areas in the tank in real time; A liquid level sensor (15) is used for detecting the storage amount of the hot mass in the tank; A pressure sensor (17) is connected with the heating U-shaped pipes (33) to monitor the working pressure; The sensor group is electrically connected with a controller to realize safety threshold early warning, the electromagnetic valve (2) is an intelligent regulating valve and is electrically connected with the controller.

6. An integrated thermal mass storage and release device according to claim 5, wherein: A water vapor separator (19) is installed on one side of the integrated storage and generation tank (1), the high-temperature steam tank (23), the secondary heating steam tank (24) and the hot water tank (21) are connected with the water vapor separator (19) through pipelines, the low-pressure steam turbine (8) is connected with the steam condenser (10) through a steam pipeline one (9), and the secondary heating tank (22) is connected with the hot water tank (21) through a communication pipe one (26).

7. An integrated thermal mass storage and release device according to claim 4, wherein: The water pump (12) is connected with the cold water tank (20) through a water inlet pipe (13) and is connected with the water storage tank (11) through a water pumping pipe, heat exchange U-shaped pipe inlets (27, 29 and 31) are arranged in the cold water tank (20) and the secondary heating steam tank (24), and heat exchange U-shaped pipe outlets (28, 30 and 32) are arranged in the hot water tank (21), the high-temperature steam tank (23) and the high-temperature high-pressure steam tank (25).

8. An integrated thermal mass storage and release device according to claim 4, wherein: The storage and generation integrated tank (1), the generator one (6), the generator two (7), the water pump (12), the water storage tank (11), the steam condenser (10), the high-pressure steam turbine (4) and the low-pressure steam turbine (8) are all fixed on the bottom tray (38), and the bottom tray (38) is fixedly connected with the storage and generation integrated tank (1) through the tank support frame (37).

9. An integrated thermal mass storage and release device according to claim 1, wherein: The outer surface of the storage and generation integrated tank (1) is covered with a ceramic fiber heat preservation layer (39), the storage and generation integrated tank (1) is installed in the energy storage station shell (41), and one side of the energy storage station shell (41) is provided with a heat dissipation window (40) corresponding to the heat dissipation surfaces of the generator one (6) and the generator two (7).

10. An integrated thermal mass storage and release device according to claim 1, wherein: The heating U-shaped pipe (33) and the heat exchange U-shaped pipe (34) are arranged in a three-dimensional spiral staggered manner in the storage and generation integrated tank (1), and the adjacent spacing is 1.5-2 times of the pipe diameter.

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