A high-voltage solid heat accumulator unit structure and a thermodynamic cycle system thereof

Abstract

The utility model discloses a high voltage solid heat accumulator's independent unit structure and thermodynamic cycle system, and the independent unit is by solid heat accumulator, electric heating body, series connection conductive tape, parallel connection conductive tape, insulating base, insulating porcelain bottle, equipment base, upper insulating layer, electrode, zero line electrode, external sleeve constitutes, and the insulating porcelain bottle is evenly arranged on the equipment base, and the insulating base is arranged on the upper portion of insulating porcelain bottle, and the solid heat accumulator is installed on the upper surface of insulating base, and the upper insulating layer is arranged on the top of solid heat accumulator. The both ends of a plurality of electric heating bodies are connected with the parallel connection conductive tape arranged on the vertical surface of solid heat accumulator, form parallel connection group, and the parallel connection group is connected with the series connection conductive tape arranged on the two corresponding vertical surfaces of solid heat accumulator, according to the independent unit structure, and the electric heating body is connected through series connection conductive tape, parallel connection conductive tape and forms the angular type connection form or star type connection form, and the electrode is connected to the A, B, C three-phase power supply of power supply switch through external sleeve.

Description

Technical Field

[0001] This utility model relates to the field of solid-state electric thermal energy storage technology, specifically to a single-unit structure of a high-voltage solid thermal energy storage body and its thermodynamic circulation system operating at 10kV to 110kV. Background Technology

[0002] When heat users go to the power supply management department to handle the electricity application procedures for connecting solid-state electric thermal storage equipment to the 10kV-110kV public power grid, some power supply management departments, considering the load carrying capacity of the power grid, require users to connect to the public power grid in multiple small-power circuits when using the approved solid-state electric thermal storage equipment capacity, in order to reduce the impact of equipment switching on the public power grid. If using existing technology, solid-state electric thermal storage equipment with a power output greater than 20MW needs to be split into multiple devices, which not only increases the equipment's footprint and investment, but also increases the heat dissipation of the external insulation layer due to the configuration of multiple devices, reducing the equipment's thermal energy utilization rate. In addition, when heat users use isolated renewable energy grids with a power supply voltage of 10kV-110kV, such isolated renewable energy grids are affected by weather conditions and their power output is fluctuating. The grid connection power of the solid-state electric thermal storage equipment must change synchronously with the output power of the isolated renewable energy grid. In addition to installing power control devices on equipment accounting for no more than one-fifth of the total power, the remaining four-fifths of the equipment also need to be divided into no less than four groups for switching. Summary of the Invention

[0003] In view of the above technical requirements, this utility model mainly solves the problems of existing solid-state electric thermal energy storage equipment in terms of large footprint, difficulty in synchronizing grid connection power with the output power of isolated new energy power grid, large heat loss of the external insulation layer area and low thermal energy utilization rate.

[0004] The present invention adopts the following technical solution: In the first aspect, a single-unit structure of a high-voltage solid heat storage body is provided. The single-unit structure consists of a solid heat storage body, an electric heating body, a series conductive strip, a parallel conductive strip, an insulating base, an insulating porcelain bottle, an equipment base, an upper insulation layer, a lead electrode, a neutral electrode, and an external sleeve. The solid heat storage body is constructed of magnesium oxide sintered bricks. Inside the solid heat storage body, there are horizontally arranged parallel electric heating elements in a through array. The distance between two adjacent electric heating elements is ≥ the voltage difference between two adjacent electric heating elements × 60 mm / kV, and the distance between two adjacent electric heating elements is ≤ the voltage difference between two adjacent electric heating elements × 300 mm / kV. The bottom of the solid heat storage body is connected to the insulating foundation, and the top of the solid heat storage body is connected to the upper insulation layer. The electric heating element is made of an electrothermal alloy and is a spiral or serpentine wire with an equal distance between the two vertical surfaces of the solid heat storage body that are horizontally penetrated by the electric heating element. The two ends of several electric heating elements are connected to parallel conductive strips set on the vertical surfaces of the solid heat storage body to form a parallel group. The parallel group is connected to series conductive strips set on the two corresponding vertical surfaces of the solid heat storage body to form an angled connection structure or a star-shaped connection structure. The insulating foundation is constructed of magnesium oxide sintered bricks, with the upper part connected to the solid heat storage body and the lower part connected to the insulating porcelain bottle; The insulating porcelain bottle is a high-voltage resistant post insulator made of electrical ceramics and is evenly arrayed on the equipment foundation and connected to the upper insulating foundation. The lead electrode and the neutral electrode are made of flat strips of heat-resistant conductive alloy material; The outer sleeve is made of high-temperature resistant insulating material. The outer sleeve is installed on the outer insulation layer and is arranged in a cyclical manner to be connected to the three-phase power supply. Each group corresponds to an independent unit and is connected to its internal lead electrode. The adjacent outer sleeves in each group are connected to the external power supply in the order of BAC, CAB, BAC, CAB, BAC.

[0005] The angular connection structure consists of solid heat storage bodies constructed into a "U" shape. The bottom and upper parts of the solid heat storage bodies are connected, with a physical gap in the middle. On the left and right sides of the "U" shape, the electric heating elements are connected horizontally and vertically end-to-end via parallel and series conductive strips. At the bottom layer, the electric heating elements on the left and right sides are connected in parallel via series conductive strips. Simultaneously, on both sides, at a distance from the bottom... A receiving electrode is led out at each height, and the electric heating elements at the top of both sides are connected together to form a receiving electrode.

[0006] The star-shaped connection structure is a U-shaped structure made of solid heat storage materials, with the lower part... The entire height section is constructed of solid heat storage material, with the upper part... The height section is constructed in two parts, left and right, with a physical space in between, at a distance from the bottom of the solid heat storage body. A neutral electrode is installed at the height, and the lower part The electric heating elements within the solid heat storage body at the top are connected laterally and longitudinally via parallel and series conductive strips. The electric heating element at the beginning of the lowest layer is connected to a receiving electrode, and the electric heating element at the end of the highest layer is connected to the neutral electrode; the upper part... The electric heating elements inside the solid heat storage bodies on the left and right sides of the height section are connected end to end in the horizontal and vertical directions through parallel conductive strips and series conductive strips. The electric heating element at the end of the bottom layer is connected to the neutral electrode, and the electric heating element at the beginning of the top layer is connected to a receiving electrode.

[0007] Secondly, a thermal natural circulation system is provided using a single-unit structure of a high-voltage solid heat storage body as described above, wherein an external insulation layer is provided outside the n single units, the first to the (n-1)th single units are connected to an evaporative heat exchanger through the external insulation layer, and the nth single unit is connected to a superheated heat exchanger through the external insulation layer.

[0008] Furthermore, the bottom of the single unit is equipped with a high-temperature sealed partition, which is made of insulating, fire-resistant and heat-insulating material. The two high-temperature sealed partitions are connected to the external insulation layer and the solid heat storage body through which the electric heating body horizontally penetrates to form a high-temperature sealed area.

[0009] Furthermore, the evaporative heat exchanger and the superheated heat exchanger are shell-and-tube heat exchangers made of metal finned tubes, which are connected to their corresponding individual units through an external insulation layer and a high-temperature enclosed zone.

[0010] Furthermore, the evaporative heat exchanger is connected to a steam drum, which is located on the upper part of the evaporative heat exchanger and is connected to multiple evaporators through pipes. The steam outlet of the steam drum is connected to the superheated heat exchanger.

[0011] Furthermore, an inner insulation layer is provided between the (n-1)th individual unit and the nth individual unit, which isolates the outer insulation layer into different temperature ranges.

[0012] The technical solution adopted in this utility model has the following advantages: In this technical solution, the solid thermal storage unit is designed with magnesium-based sintered bricks. The spacing between adjacent electric heating elements within the solid thermal storage unit is ≥ the voltage difference between adjacent electric heating elements × 60 mm / kV. The creepage distance between adjacent electric heating elements is much greater than the minimum creepage distance of 35.7 mm / kV specified in the electrical equipment insulation standard. This avoids accidents caused by arc discharge in the electric heating elements due to the high temperature environment of the thermal storage unit, which could break down the solid thermal storage unit. Furthermore, the spacing between adjacent electric heating elements is ≤ the voltage difference between adjacent electric heating elements × 300 mm / kV. This arrangement avoids accidents caused by excessive height of the solid thermal storage unit, which could reduce seismic resistance and lead to the collapse of the solid thermal storage unit. By changing the connection structure of the electric heating elements in the solid thermal storage unit, star and delta connections can be flexibly realized. This breaks through the technical bottleneck that the original high-voltage solid thermal storage unit could only be connected to a single-phase 10kV to 110kV power supply. It also facilitates the design and installation of high-voltage solid thermal storage equipment with built-in multi-channel switching electric thermal storage circuits. When the power of solid-state thermal energy storage projects is large and the power grid has limitations on the single switching capacity, the solid-state thermal energy storage unit structure of this solution can be adopted. Multiple solid-state thermal energy storage units can be installed in the same outer insulation shell. Each solid-state thermal energy storage unit has the ability to work independently, with independent power supply switching and independent heat output operation. This results in a small equipment footprint, reduced equipment investment, and improved thermal energy utilization. Attached Figure Description

[0013] The above and other objects, features, and advantages of the present invention will become readily understood by reading the following detailed description of exemplary embodiments with reference to the accompanying drawings. In the drawings, several embodiments of the present invention are shown by way of example and not limitation, with the same or corresponding reference numerals denoteing the same or corresponding parts, wherein: Figure 1 This is a schematic diagram of the electrical angle connection form of the independent unit structure of this utility model; Figure 2 This is a schematic diagram of the electrical star connection form of the independent unit structure of this utility model; Figure 3 This is a schematic diagram of the system structure layout of this utility model; Figure 4 This is a schematic diagram of the system process flow of this utility model; Explanation of icon numbers: 1. Independent unit; 1-1. Solid heat storage body; 1-2. Electric heating body; 1-3. Series conductive strip; 1-4. Parallel conductive strip; 1-5. Insulating foundation; 1-6. Insulating porcelain bottle; 1-7. Equipment foundation; 1-8. Upper insulation layer; 1-9. Connecting electrode; 1-10. Neutral electrode; 2. External insulation layer; 3. High-temperature sealed partition; 4. Internal insulation layer; 5. Evaporative heat exchanger; 6. Superheated heat exchanger; 7. Steam drum; 8. High-temperature sealed area; 9. External sleeve. Detailed Implementation

[0014] Existing solid-state thermal energy storage devices require multiple units, increasing both the footprint and investment. Furthermore, the increased number of units leads to greater heat loss from the external insulation layer, reducing thermal efficiency. Therefore, it is necessary to research a single-unit solid-state thermal energy storage structure that can be connected to a 10kV–110kV three-phase power supply. This structure would allow multiple units installed within the same external insulation shell to operate independently, resulting in a smaller footprint, reduced investment, and improved thermal efficiency.

[0015] This technical solution discloses a single-unit structure for a high-voltage solid thermal storage body. Multiple single-unit structures are installed inside the solid-state electric thermal storage device, and each single-unit structure is connected to an external three-phase power supply, which can achieve the effect of each single-unit structure switching on and off independently.

[0016] Combination Figure 1 , Figure 2 , Figure 3 and Figure 4 The single-unit structure mainly includes: Figure 1 This is a schematic diagram of the electrical angle connection form of the single-unit structure of this utility model. In the figure, 1 is the single unit, 1-1 is the solid heat storage body, 1-2 is the electric heating body, 1-3 is the series conductive strip, 1-4 is the parallel conductive strip, 1-5 is the insulating base, 1-6 is the insulating porcelain bottle, 1-7 is the equipment base, 1-8 is the upper insulation layer, and 1-9 is the receiving electrode.

[0017] Figure 2 This is a schematic diagram of the electrical star connection of the single-unit structure of this utility model. 1 is a single unit, 1-1 is a solid heat storage body, 1-2 is an electric heating body, 1-3 is a series conductive strip, 1-4 is a parallel conductive strip, 1-5 is an insulating base, 1-6 is an insulating porcelain bottle, 1-7 is an equipment base, 1-8 is an upper insulation layer, 1-9 is a receiving electrode, and 1-10 is a neutral electrode.

[0018] Figure 3This is a schematic diagram of the system structure layout of this utility model. It consists of n independent units 1, where 2 is the outer insulation layer, 3 is the high-temperature sealing partition, 4 is the inner insulation partition, 5 is the evaporative heat exchanger, 6 is the superheated heat exchanger, 7 is the steam drum, 8 is the high-temperature sealing zone, and 9 is the outer sleeve.

[0019] Figure 4 This is a schematic diagram of the system process flow of this utility model. The three-phase power supply lines A, B, and C are controlled by the power supply system to distribute power to n independently controlled power supply lines to n individual units, which are then delivered to heat users through corresponding evaporators, steam drums, and superheaters.

[0020] This embodiment provides a single-unit structure for a high-voltage solid heat storage body. The single-unit 1 consists of a solid heat storage body 1-1, an electric heating body 1-2, a series conductive strip 1-3, a parallel conductive strip 1-4, an insulating base 1-5, an insulating porcelain bottle 1-6, an equipment base 1-7, an upper insulation layer 1-8, a connecting electrode 1-9, a neutral electrode 1-10, and an external sleeve 9.

[0021] Insulating porcelain bottles 1-6, made of electrical ceramics and resistant to high voltage, are uniformly arranged in an array on the equipment foundation 1-7. An insulating foundation 1-5, made of magnesium oxide sintered bricks, is set on the upper part of the insulating porcelain bottles 1-6. A solid heat storage body 1-1 is installed on the insulating foundation 1-5. An upper insulation layer 1-8 is set on the top of the solid heat storage body 1-1. The electric heating elements 1-2 are made of electrothermal alloy wound into spiral or serpentine wires. The distance between two adjacent electric heating elements 1-2 is ≥ the voltage difference between two adjacent electric heating elements 1-2 × 60 mm / kV; the distance between two adjacent electric heating elements 1-2 is ≤ the voltage difference between two adjacent electric heating elements 1-2 × 300 mm / kV. Each electric heating element 1-2 is arranged in parallel within the solid heat storage body 1-1. The positions through which the electric heating elements 1-2 are arranged in the solid heat storage body 1-1 also serve as hot air heat release channels. The two ends of several electric heating elements 1-2 are connected to parallel conductive strips 1-4 set on the vertical surface of the solid heat storage body 1-1, forming a parallel group. The parallel group is connected to series conductive strips 1-3 set on two corresponding vertical surfaces of the solid heat storage body 1-1. Depending on the specific electrical connection requirements, the electric heating elements 1-2 can be interconnected through series conductive strips 1-3 and parallel conductive strips 1-4 to form... Figure 1 The angular connection form, or Figure 2 The star topology.

[0022] It should be noted that the adjacent distance between electric heating elements 1-2 is arranged primarily to prevent breakdown, with the optimal spacing being 60mm / kV-300mm / kV.

[0023] like Figure 1In the angular connection form shown, the solid heat storage body 1-1 in the overall single-unit structure is built into a "square" structure. The solid heat storage bodies 1-1 at the bottom and the top are connected, and a physical spacing space is left in the middle. On the left and right sides of the "square" structure of the solid heat storage body 1-1, the electric heating bodies 1-2 are horizontally and longitudinally connected end to end by parallel conductive bands 1-4 and series conductive bands 1-3 in a mirror image manner. At the bottommost layer, the parallel groups of electric heating bodies 1-2 on the left and right sides are connected by the series conductive band 1-3. At the same time, at the height from the bottom at each side, a connection electrode 1-9 is led out, and the electric heating bodies 1-2 at the uppermost part on both sides are connected together to form a connection electrode 1-9.

[0024] As Figure 2 shown in the star connection form, the solid heat storage body 1-1 in the overall single-unit structure is built into a "concave" structure. The height part at the lower part is entirely built with the solid heat storage body 1-1, and the height part at the upper part is built into two parts on the left and right, with a physical spacing space left in the middle. A zero-line electrode 1-10 is set at the height from the bottom of the solid heat storage body 1-1. The electric heating bodies 1-2 in the solid heat storage body 1-1 in the height part at the lower part are horizontally and longitudinally connected end to end by parallel conductive bands 1-4 and series conductive bands 1-3. The electric heating body 1-2 at the starting position of the bottommost layer is connected to a connection electrode 1-9, and the electric heating body 1-2 at the ending position of the uppermost layer is connected to the zero-line electrode 1-10; for the height part at the upper part, the electric heating bodies 1-2 in the solid heat storage bodies 1-1 on the left and right sides are horizontally and longitudinally connected end to end by parallel conductive bands 1-4 and series conductive bands 1-3. The electric heating body 1-2 at the ending position of the bottommost layer is connected to the zero-line electrode 1-10, and the electric heating bodies 1-2 at the starting positions of the uppermost layer are each connected to a connection electrode 1-9.

[0025] Figure 3This is a schematic diagram of the system structure layout of this utility model. This example is a set of equipment structure layouts, with an external insulation layer 2 set on the outside of the structure, and the inside consisting of 5 independent units 1. Each independent unit 1 has 3 external sleeves 9 installed on the external insulation layer 2 corresponding to the power supply side. The internal lead electrodes 1-9 are connected to the A, B, and C three-phase power supply of the power supply switch through the external sleeves 9. Each set of adjacent external sleeves 9 is connected to the external power supply in the order BAC, CAB, BAC, CAB, BAC. If the operating temperature between each independent unit 1 varies greatly, the isolation of the inner insulation layer 4 can be increased. Each individual unit 1, corresponding to the heat exchange side, is externally equipped with an evaporative heat exchanger 5, a superheater heat exchanger 6, and a steam drum 7, forming a heat circulation system. Depending on system requirements, each individual unit 1 corresponds to either an evaporative heat exchanger 5 or a superheater heat exchanger 6. Each individual unit 1 corresponds to one heat exchange side, and a high-temperature sealed partition 3 made of insulating and refractory material is installed inside the individual unit 1 and the insulation layer 2, forming a high-temperature sealed zone 8. An inner insulation layer 4 is installed between an individual unit 1 connected to the superheater heat exchanger 6 and an individual unit 1 connected to the evaporative heat exchanger 5, forming different temperature ranges. Figure 3 As shown, the evaporator heat exchanger 5 is connected to the steam drum 7, which in turn is connected to the superheater heat exchanger 6, ultimately outputting superheated steam.

[0026] Example description: In a certain petrochemical project, the production of medium-pressure steam at 3.82 MPa and 450 °C is 50 t / h, with an annual steam production of 341,500 tons. The total power of the project is 150 MW, and the working voltage is 35 kV. Among them, there are 2 road network power supplies, using the valley period electricity of 8 hours per day for heat storage work and 1 off-grid wind power dedicated line for heat storage work. The network power capacity is 100 MW, which is divided into two power supplies, each with 50 MW. The power supply management department requires the user to divide a single 50 MW into 4 devices of 10.25 MW and 1 device of 9 MW. The wind power is supplied by a 50 MW off-grid dedicated line. To make full use of the wind power, the user requests to configure two 5 MW thyristor power regulation devices and two 10 MW + four 5 MW devices that can be individually switched. Moreover, the total floor area of the project is less than 2,600 square meters. The characteristic of this project is that three devices with a capacity of 50 MW / 35 kV are divided into 18 independently controllable devices. In order to achieve the purpose of high reliability and large-capacity heat storage, the user requests to configure the solid heat storage body with a weight more than twice that of traditional devices, that is, 120 kg / kW. To complete this project, the inventor of the present invention designed the delta connection form in the present technical solution. The structure form of the solid heat storage body 1-1 is as described above. The "hui" character structure can connect the three-phase power supply to one solid heat storage body 1-1, without the need to set 54 solid heat storage bodies 1-1 for 18 independently controllable devices. Using the present technical solution, only 18 single-unit units 1 need to be set for 18 independently controllable devices, which is far less than the traditional single-phase single-unit unit 1 layout scheme. In the structure of the delta-connected solid heat storage body 1-1, the number of layers of the 35 kV electric heating body is 24 layers, and the height of each layer is 195 mm. Calculated as follows: 24×195 mm÷35 kV≈134 mm / kV>60 mm / kV. It can be seen that the creepage distance between adjacent two electric heating bodies is much greater than the requirement of the minimum creepage distance of 35.7 mm / kV specified in the electrical equipment insulation specification, ensuring that no arcing discharge phenomenon occurs during the heat storage work of the single-unit unit 1. This solution can greatly reduce the land use, reduce the surface area of the equipment's external insulation layer, reduce the heat insulation loss of the equipment, improve the utilization rate of the equipment's heat energy, and realize the optimization of the technical solution of the high-voltage solid electric heat storage project.

[0027] Thus, as Figure 1 shown, the solid heat storage body 1-1 in the overall single-unit unit structure is built into a "hui" character structure, with the solid heat storage bodies 1-1 at the bottom and the top connected, and a physical separation space left in the middle. On the left and right sides of the "hui" character structure of the solid heat storage body 1-1, the electric heating bodies 1-2 are connected horizontally and longitudinally end to end by parallel conductive bands 1-4 and series conductive bands 1-3 in a mirror image manner. At the bottommost layer, the parallel groups of the electric heating bodies 1-2 on the left and right sides are connected by a series conductive band 1-3. At the same time, at a height from the bottom on both the left and right sides, a接引电极1-9 is led out respectively, and the electric heating bodies 1-2 at the uppermost part on both sides are connected together to form a接引电极1-9.

[0028] The above description is merely a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the protection scope of the claims.

Claims

1. A single-unit structure for a high-voltage solid thermal energy storage body, characterized in that: The single unit (1) consists of a solid heat storage body (1-1), an electric heating body (1-2), a series conductive strip (1-3), a parallel conductive strip (1-4), an insulating base (1-5), an insulating porcelain bottle (1-6), an equipment base (1-7), an upper insulation layer (1-8), a receiving electrode (1-9), a neutral electrode (1-10), and an external sleeve (9); The solid heat storage body (1-1) is constructed of magnesium oxide sintered bricks. Inside the solid heat storage body (1-1) are horizontally arranged parallel electric heating elements (1-2). The distance between two adjacent electric heating elements (1-2) is ≥ the voltage difference between two adjacent electric heating elements (1-2) × 60 mm / kV, and the distance between two adjacent electric heating elements (1-2) is ≤ the voltage difference between two adjacent electric heating elements (1-2) × 300 mm / kV. The bottom of the solid heat storage body (1-1) is connected to the insulating base (1-5), and the top of the solid heat storage body (1-1) is connected to the upper insulation layer (1-8). The electric heating element (1-2) is made of an electric heating alloy and is a spiral or serpentine wire with an equal distance between the two vertical surfaces of the solid heat storage body (1-1) which is horizontally penetrated by the electric heating element (1-2). The two ends of several electric heating elements (1-2) are connected to parallel conductive strips (1-4) set on the vertical surface of the solid heat storage body (1-1) to form a parallel group. The parallel group is connected to the series conductive strips (1-3) set on the two corresponding vertical surfaces of the solid heat storage body (1-1) to form an angle connection structure or a star connection structure. The insulating base (1-5) is constructed of magnesium oxide sintered bricks, with the upper part connected to the solid heat storage body (1-1) and the lower part connected to the insulating porcelain bottle (1-6). The insulating porcelain bottle (1-6) is a high-voltage resistant post insulator made of electrical ceramics and is evenly arrayed on the equipment foundation (1-7) and connected to the upper insulating foundation (1-5). The lead electrode (1-9) and the neutral electrode (1-10) are made of flat strips of heat-resistant and conductive alloy material; The outer sleeve (9) is made of high temperature resistant insulating material. The outer sleeve (9) is installed on the outer insulation layer and is arranged in a cyclical manner to be connected to the three-phase power supply. Each group corresponds to a single unit (1) and is connected to the internal lead electrode (1-9). The adjacent outer sleeves (9) in each group are connected to the external power supply in the order of BAC, CAB, BAC, CAB, BAC.

2. The single-unit structure of a high-voltage solid heat storage body according to claim 1, characterized in that: The angular connection structure is constructed from solid heat storage bodies (1-1) in a U-shape. The bottom and upper solid heat storage bodies (1-1) are connected, with a physical gap in between. On the left and right sides of the U-shape of the solid heat storage bodies (1-1), the electric heating bodies (1-2) are connected horizontally and vertically end-to-end via parallel conductive strips (1-4) and series conductive strips (1-3). At the bottom layer, the electric heating bodies (1-2) on the left and right sides are connected in parallel via series conductive strips (1-3). Simultaneously, on both sides, at a distance from the bottom... A receiving electrode (1-9) is led out at each height, and the electric heating elements (1-2) at the top of both sides are connected together to form a receiving electrode (1-9).

3. The single-unit structure of a high-voltage solid heat storage body according to claim 1, characterized in that: The star-shaped connection structure is formed by solid heat storage bodies (1-1) building into a U-shaped structure, with the lower part... The entire height section is constructed of solid heat storage material (1-1), with the upper part... The height section is constructed in two parts, left and right, with a physical space in between, at a distance from the bottom of the solid heat storage body (1-1). A neutral electrode (1-10) is installed at the height, and the lower part... The electric heating element (1-2) within the solid heat storage body (1-1) in the height section is connected end-to-end laterally and longitudinally via parallel conductive strips (1-4) and series conductive strips (1-3). The electric heating element (1-2) at the beginning of the lowest layer is connected to a receiving electrode (1-9), and the electric heating element (1-2) at the end of the highest layer is connected to the neutral electrode (1-10). The electric heating elements (1-2) inside the solid heat storage bodies (1-1) on the left and right sides of the height section are connected horizontally and vertically through parallel conductive strips (1-4) and series conductive strips (1-3). The electric heating element (1-2) at the end of the lowest layer is connected to the zero line electrode (1-10), and the electric heating element (1-2) at the beginning of the highest layer is connected to a lead electrode (1-9).

4. A thermodynamic natural circulation system formed using a single-unit structure of a high-voltage solid thermal storage body as described in claim 1, characterized in that: The natural circulation system includes n individual units (1), and an external insulation layer (2) is provided outside the n individual units (1). The first to the (n-1)th individual units (1) are connected to an evaporative heat exchanger (5) through the external insulation layer (2), and the nth individual unit (1) is connected to a superheated heat exchanger (6) through the external insulation layer (2).

5. The thermodynamic natural circulation system according to claim 4, characterized in that: The bottom of the single unit (1) is provided with a high temperature closed partition (3). The high temperature closed partition (3) is made of insulating, fire-resistant and heat-insulating material. The two high temperature closed partitions (3) are connected to the external insulation layer (2) and the solid heat storage body (1-1) through the horizontal vertical surface of the electric heating body (1-2) to form a high temperature closed area (8).

6. The thermodynamic natural circulation system according to claim 4, characterized in that: Evaporative heat exchanger (5) and superheated heat exchanger (6) are shell-and-tube heat exchangers made of metal finned tubes, and are connected to their corresponding independent units (1) through an outer insulation layer (2) and a high-temperature enclosed zone (8).

7. The thermodynamic natural circulation system according to claim 4, characterized in that: The evaporative heat exchanger (5) is connected to a steam drum (7), which is located on the upper part of the evaporative heat exchanger (5) and connected by a pipe. The steam outlet of the steam drum (7) is connected to the superheated heat exchanger (6).

8. The thermodynamic natural circulation system according to claim 4, characterized in that: An inner insulation layer (4) is provided between the (n-1)th individual unit (1) and the nth individual unit (1), and the inner insulation layer (4) isolates the outer insulation layer (2) into different temperature ranges.

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