A single-tank molten salt electrode heating system integrating peak-valley electric thermal storage / release

Abstract

This utility model discloses a single-tank molten salt electrode heating system integrating peak-valley electric thermal storage / release, belonging to the field of molten salt energy storage technology. It includes an integrated thermal storage / release single tank. The hot medium inlet of the integrated thermal storage / release single tank is connected in series with a first control valve, and then in parallel with a sixth and fifth control valve. The sixth control valve is connected to the outlet of the molten salt electrode heating mechanism. The fifth control valve is connected to the hot-side inlet of the steam generator. The cold medium inlet of the integrated thermal storage / release single tank is connected in series with a second control valve, and then in parallel with a fourth and third control valve. The fourth control valve is connected to the inlet of the molten salt electrode heating mechanism. The third control valve is connected to the cold-side outlet of the steam generator. The cold medium inlet of the steam boiler is connected in parallel with a seventh and eighth control valve. The seventh control valve is connected to the cold-side outlet of the steam generator. The eighth control valve is connected to an external refrigerant source. This utility model can reduce equipment investment, lower costs, and improve heating efficiency.

Description

Technical Field

[0001] This utility model belongs to the field of molten salt energy storage technology, and in particular relates to a single-tank molten salt electrode heating system that integrates peak-valley electric thermal storage / release. Background Technology

[0002] With increasing global emphasis on carbon neutrality, the installed capacity of renewable energy sources such as wind and solar power has experienced explosive growth. However, the intermittency and uncertainty of these renewable energy generation methods pose significant challenges to the reliable and stable operation of the power system, exacerbating the problem of uneven energy demand. There are significant differences in energy demand between day and night, with energy supply strained during peak daytime hours and large amounts of idle energy during off-peak nighttime hours. Furthermore, the demand for different types of energy, such as thermal power, is also uneven, resulting in resource waste ("curtailment of wind and solar power") and redundant installed capacity. Energy storage systems are an essential path to achieve timely utilization of surplus electricity, balanced daytime and nighttime power supply through peak shaving and valley filling, and the conversion between different energy types. Molten salt energy storage, as an energy storage method with frequent access and flexible conversion, has been successfully applied in areas such as solar concentrating and deep peak shaving of thermal power equipment due to its advantages of large heat storage capacity, long lifespan, and safety and reliability. Existing technologies using dual-tank molten salt thermal storage systems are costly and require large footprints. Molten salt heating often uses resistance heating, which is inefficient and lacks precise temperature control. There is an urgent need for a compact, efficient, and flexible peak-shaving heating system. Utility Model Content

[0003] Technical Problem Solved: To address the technical problems existing in the background technology, this utility model provides a single-tank molten salt electrode heating system integrating peak-valley electric thermal storage / release. It adopts a single-tank structure to reduce equipment investment and lower costs; the electrodes directly heat the molten salt, improving heating efficiency; the PTC heating element adopts an anti-solidification design to improve system reliability and reduce system failure rate; it has grid compatibility and adopts four operating modes to adapt to peak-valley electricity pricing policies, resulting in significant economic benefits from peak shaving and valley filling.

[0004] Technical solution: The present invention provides a single-tank molten salt electrode heating system integrating peak-valley electric thermal storage / release, comprising:

[0005] A single tank integrating heat storage and heat release, with a hot medium inlet at the top and a cold medium inlet at the bottom;

[0006] Molten salt electrode heating mechanism;

[0007] Steam generator, electric steam boiler;

[0008] First molten salt pump, second molten salt pump, circulation pump;

[0009] in:

[0010] The heat medium inlet of the integrated heat storage / heat release tank is connected in series with the first control valve, and then in parallel with the sixth and fifth control valves; the sixth control valve is connected to the outlet of the molten salt electrode heating mechanism; the fifth control valve is connected in series with the second molten salt pump and then to the hot side inlet of the steam generator.

[0011] The cold medium inlet of the integrated heat storage / heat release tank is connected in series with the second control valve, and then in parallel with the fourth and third control valves; the fourth control valve is connected in series with the first molten salt pump and then connected to the inlet of the molten salt electrode heating mechanism; the third control valve is connected to the cold side outlet of the steam generator.

[0012] The cold medium inlet of the steam-electric boiler is connected in parallel with a seventh control valve and an eighth control valve; the seventh control valve is connected to the cold side outlet of the steam generator; the eighth control valve is connected in series with a circulating pump and then connected to an external cold medium source.

[0013] Preferably, the molten salt electrode heating mechanism includes a housing and a partition cover plate sealed to the top of the housing. The housing is provided with a molten salt heating chamber, and the inner wall of the housing is provided with a heat insulation layer.

[0014] The molten salt heating chamber is equipped with a phase electrode, a zero-position electrode, and a support base for lifting and adjusting.

[0015] The support base is connected to the power drive mechanism and has a spray pipe at the bottom that is aligned with the electrode area.

[0016] High-voltage alternating current is connected to the phase electrodes through an insulating mechanism, and the heating power is controlled by adjusting the lifting and lowering of the support base to change the relative contact area of ​​the electrodes.

[0017] Preferably, the combined phase electrode and zero-position electrode include multiple sets arranged circumferentially along the central axis of the partition cover plate; the top of the phase electrode is provided with an electrode connecting rod penetrating the partition cover plate, and the insulation mechanism is correspondingly connected to the top of the electrode connecting rod;

[0018] A drive link is provided in the center of the support base, and the drive link passes through the partition cover plate and is connected to the power drive mechanism.

[0019] Preferably, the drive linkage is a transmission rack, and the power drive mechanism includes a drive motor and a drive gear correspondingly disposed at the shaft end of the drive motor, wherein the drive gear meshes with the transmission rack for transmission connection.

[0020] Preferably, the drive linkage is a lead screw, and the power drive mechanism includes a drive motor and a lead screw sleeve correspondingly disposed at the shaft end of the drive motor, the lead screw sleeve being correspondingly connected to the lead screw.

[0021] Preferably, the integrated heat storage / heat release tank is provided with multiple salt distributors along the height direction. Each salt distributor has multiple salt distribution holes evenly distributed along its radial direction on its surface. PTC heating elements are distributed at intervals on the upper and lower sides of the salt distributor. The PTC heating elements are connected to a temperature controller, which adjusts the working status of the heating elements in real time and monitors the temperature of the molten salt in real time.

[0022] Compared with the prior art, the present invention has at least the following beneficial effects:

[0023] 1. The working fluid of the integrated heat storage / release single tank and the molten salt electrode heating mechanism adopted in this utility model is molten salt, which makes the system structure more compact. The integrated heat storage / release single tank structure reduces equipment investment by more than 30%, and the footprint is smaller compared to the dual-tank heat storage system. At the same time, the heat storage medium of the entire system is molten salt, which reduces equipment usage, lowers investment, reduces installation space, and makes operation more stable. The molten salt electrode heating mechanism and the heat exchange equipment only exchange heat once, resulting in higher heat exchange efficiency.

[0024] 2. The integrated heat storage / release tank is equipped with a salt distributor and a PTC heating element, which can preheat the molten salt and prevent the flow channel from being blocked due to the cold molten salt solidifying at too low a temperature. The salt distributor is equipped with a temperature controller, which can detect the temperature of the molten salt around the salt distributor in real time and make fine adjustments according to the temperature of the molten salt in the salt distributor, so that the temperature of the incoming molten salt is consistent in the radial section of the integrated heat storage / release tank, promoting the formation of a sloped temperature layer in the integrated heat storage / release tank.

[0025] 3. This integrated heat storage / release tank has an opening only at the center of the tank bottom, and no openings on the side walls of the tank body. Compared with conventional molten salt heat storage tanks, this reduces the increase in temperature stratification thickness caused by the molten salt inlet and outlet pipe structure.

[0026] 4. This system uses off-peak electricity to heat the molten salt heat storage medium to complete heat storage, providing heating and domestic hot water for heat users;

[0027] 5. This molten salt electrode heating mechanism uses electrode heating instead of resistance heaters, which results in fast heating speed, uniform temperature distribution of molten salt in the tank, improved heat storage efficiency, reduced tank volume occupation and power distribution costs, and energy saving and environmental protection.

[0028] 6. This molten salt electrode heating mechanism adjusts the relative area between the phase electrode and the zero-position electrode by raising and lowering the support base of the zero-position electrode, thereby controlling the heating power of the molten salt; the structure is more simplified and the equipment is easier to maintain.

[0029] 7. The system is grid compatible, operates in four modes to adapt to peak-valley electricity pricing policies, and has significant economic benefits in peak shaving and valley filling.

[0030] This invention also has other beneficial effects, which are described in the embodiments section of the specification and will not be repeated here. Attached Figure Description

[0031] Figure 1 This is a schematic diagram of the structure of the integrated peak-valley electric thermal storage / release single-tank molten salt electrode heating system of this utility model;

[0032] Figure 2 for Figure 1 A schematic diagram of the internal structure of the molten salt electrode heating mechanism.

[0033] Reference numerals: 1. Integrated heat storage / release single tank; 2. Molten salt electrode heating mechanism; 201. Shell; 202. Insulation layer; 203. Molten salt heating chamber; 204. Phase electrode; 205. Zero-position electrode; 206. Injection pipe; 207. Insulation mechanism; 208. Power drive mechanism; 209. Support base; 210. Partition cover; 211. Motor bracket; 212. Salt inlet pipe; 213. Salt outlet pipe; 214. Drive linkage; 215. Electrode linkage; 3. Steam generator; 4. Steam electric boiler; 5. Salt distributor; 6. Circulation pump; 7. First molten salt pump; 8. Second molten salt pump; 9. First control valve; 10. Second control valve; 11. Third control valve; 12. Fourth control valve; 13. Fifth control valve; 14. Sixth control valve; 15. Seventh control valve; 16. Eighth control valve. Detailed Implementation

[0034] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the following will be described in conjunction with the accompanying drawings. Figures 1-2 The technical solutions of the embodiments of this utility model are clearly and completely described below. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. All other embodiments obtained by those skilled in the art based on the described embodiments of this utility model are within the protection scope of this utility model.

[0035] Example 1: As Figure 1As shown, this utility model provides a peak-valley electric thermal storage / release integrated single-tank molten salt electrode heating system, including a thermal storage / release integrated single tank 1, a molten salt electrode heating mechanism 2, a steam generator 3, a steam electric boiler 4, a circulating pump 6, a first molten salt pump 7, and a second molten salt pump 8. The thermal storage / release integrated single tank 1 has a hot medium inlet at the top and a cold medium inlet at the bottom. This integrated single tank has an opening only at the center of the bottom, with no openings on the side walls of the tank body. Compared with conventional molten salt thermal storage tanks, this reduces the increase in temperature stratification thickness caused by the molten salt inlet and outlet pipe structure. Specifically, the hot medium inlet of the thermal storage / release integrated single tank 1 is connected in series with a first control valve 9, and then in parallel with a sixth control valve 14 and a fifth control valve 13. The sixth control valve 14 is connected to the outlet of the molten salt electrode heating mechanism 2; the fifth control valve 13 is connected in series with the second molten salt pump 8 and then connected to the hot side inlet of the steam generator 3. The cold medium inlet of the integrated heat storage / release single tank 1 is connected in series with the second control valve 10, and then in parallel with the fourth control valve 12 and the third control valve 11; the fourth control valve 12 is connected in series with the first molten salt pump 7 and then connected to the inlet of the molten salt electrode heating mechanism 2; the third control valve 11 is connected to the cold side outlet of the steam generator 3. The cold medium inlet of the steam electric boiler 4 is connected in parallel with the seventh control valve 15 and the eighth control valve 16; the seventh control valve 15 is connected to the cold side outlet of the steam generator 3; the eighth control valve 16 is connected in series with the circulating pump 6 and then connected to an external refrigerant source. It should be noted that... Figure 1 Only one pipeline and control valve system is displayed. For example, the number of first control valve 9, second control valve 10 and their connecting short pipes can be set to multiple to meet the pipeline connection requirements of different operating modes of the single-tank molten salt electrode heating system. The specific pipeline connection method and the number of control valves can be implemented according to the requirements and existing engineering technology, which will not be elaborated here.

[0036] The working medium of the integrated heat storage / release single tank and the molten salt electrode heating mechanism adopted in this utility model is molten salt, which makes the system structure more compact. The integrated heat storage / release single tank structure reduces equipment investment by more than 30%, and the footprint is smaller compared to the dual-tank heat storage system. At the same time, the heat storage medium of the entire system is molten salt, which reduces equipment usage, lowers investment, reduces installation space, and makes operation more stable. The molten salt electrode heating mechanism and the heat exchange equipment only exchange heat once, resulting in higher heat exchange efficiency.

[0037] like Figure 2As shown, the molten salt electrode heating mechanism 2 includes a housing 201 and a partition cover 210 sealed to the top of the housing. A molten salt heating chamber 203 is disposed inside the housing 201, and an insulation layer 202 is provided on the inner wall of the housing 201. The molten salt heating chamber 203 contains a phase electrode 204, a zero-position electrode 205, and a lifting and adjusting support base 209. The support base 209 is connected to a power drive mechanism 208, and a spray pipe 206 aligned with the electrode area is provided at its bottom. High-voltage AC power is supplied to the phase electrode 204 through an insulation mechanism 207, and the heating power is controlled by adjusting the lifting and lowering of the support base 209 to change the relative contact area between the electrodes. The molten salt electrode heating mechanism 2 uses electrode heating instead of a resistance heater, resulting in faster heating, more uniform molten salt temperature distribution within the tank, improved heat storage efficiency, reduced tank volume occupation and power distribution costs, and energy conservation and environmental protection.

[0038] The molten salt electrode heating mechanism 2 of this invention adopts an immersion electrode structure. Cold salt enters the molten salt heating chamber 203 through the salt inlet pipe 212 via the first molten salt pump 7 and is discharged through the salt outlet pipe 213. High-voltage three-phase AC power is introduced into the molten salt heating chamber 203 from the outside of the molten salt electrode heating mechanism 2 through the insulation mechanism 207. The phase electrode 204 is connected to the zero-position electrode 205 through molten salt to form an internal component. A spray pipe 206 is arranged at the corresponding position on the support base 209 below the phase electrode 204 to spray the cold molten salt from the bottom of the molten salt heating chamber 203 around the phase electrode 204 and the zero-position electrode 205. The relative area of ​​the phase electrode 204 and the zero-position electrode 205 is adjusted by raising and lowering the support base 209 of the zero-position electrode 205, thereby adjusting the molten salt heating power. When the support base 209 moves upward, the relative area between the zero electrode 205 and the phase electrode 204 increases, the current path length increases, the generated current increases, and the heating power increases; when the support base 209 moves downward, the relative area between the zero electrode 205 and the phase electrode 204 decreases, the current path length decreases, the generated current decreases, and the heating power decreases.

[0039] In one specific embodiment, such as Figure 2As shown, the combined phase electrode 204 and zero electrode 205 include multiple sets arranged circumferentially along the central axis of the partition cover plate 210; the top of the phase electrode 204 is provided with an electrode connecting rod 215 that penetrates the partition cover plate 210, and the insulation mechanism 207 is correspondingly connected to the top of the electrode connecting rod 215 and electrically connected to the high-voltage AC power; the length and height of the power supply cable connected to the insulation mechanism 207 are set according to requirements to meet the lifting requirements of the electrode connecting rod 215. A drive connecting rod 214 is provided in the center of the support base 209, and the drive connecting rod 214 passes through the partition cover plate 210 and is connected to the power drive mechanism 208. The power drive mechanism 208 adjusts the position of the support base 209 in the molten salt heating chamber 203 through the drive connecting rod 214, thereby adjusting the relative area of ​​the phase electrode and the zero electrode and realizing the control of the molten salt heating power; this structure is more simplified and the equipment is easier to maintain.

[0040] In a preferred embodiment, the drive linkage 214 is a transmission rack, and the power drive mechanism 208 includes a drive motor mounted on the motor bracket 211 and a drive gear correspondingly mounted on the shaft end of the drive motor. The drive gear meshes with the transmission rack for transmission. The drive motor drives the drive gear to mesh with the transmission rack for transmission, thereby adjusting the position of the support base 209 in the molten salt heating chamber 203 through the transmission rack.

[0041] In a preferred embodiment, the drive linkage 214 is a lead screw, and the power drive mechanism 208 includes a drive motor mounted on the motor bracket 211 and a lead screw sleeve correspondingly mounted on the shaft end of the drive motor. The lead screw sleeve is correspondingly connected to the lead screw. It should be noted that a transmission mechanism, such as a worm gear structure, can be provided between the lead screw sleeve and the shaft end of the drive motor as required, to realize the power transmission and power redirection of the lead screw sleeve rotating along its axis. Those skilled in the art can make improvements or settings based on existing technology and engineering requirements to meet the power transmission target of the lead screw and the lead screw sleeve.

[0042] In a preferred embodiment, such as Figure 1As shown, a multi-layered salt distributor 5 is arranged along the height direction inside the integrated heat storage / release tank 1. The number and position of the salt distributor 5 can be set according to requirements. Each salt distributor 5 has multiple salt distribution holes evenly distributed radially on its surface, communicating with the inner cavity of the integrated heat storage / release tank 1. PTC heating elements are spaced apart on the upper and lower sides of the salt distributor 5. The PTC heating elements are connected to a temperature controller, which adjusts the working status of the heating elements in real time and monitors the molten salt temperature. The integrated heat storage / release tank is equipped with salt distributors and PTC heating elements, which preheat the molten salt and prevent the cold molten salt from solidifying and causing flow channel blockage. The temperature controller on the salt distributor can detect the molten salt temperature around the distributor in real time and make fine adjustments based on the molten salt temperature of the distributor, ensuring that the temperature of the flowing molten salt remains consistent across the radial cross-section of the integrated heat storage / release tank, promoting the formation of a temperature gradient layer within the integrated heat storage / release tank.

[0043] The operation method of the single-tank molten salt electrode heating system of this utility model mainly includes the following four working modes.

[0044] (I) During off-peak electricity hours and when there is no heating demand, the system is in heat storage mode: the first control valve 9, the second control valve 10, the fourth control valve 12, and the sixth control valve 14 are opened; the third control valve 11, the fifth control valve 13, the second molten salt pump 8, the seventh control valve 15, and the eighth control valve 16 are closed; the first molten salt pump 7 is turned on, and the molten salt electrode heating mechanism 2 is in operation. At this time, the cold molten salt in the integrated heat storage / release tank 1 flows through the second control valve 10 and the fourth control valve 12, and is pumped into the molten salt electrode heating mechanism 2 by the first molten salt pump 7 for heating and energy storage. The heated molten salt flows into the integrated heat storage / release tank 1 through the sixth control valve 14 and the first control valve 9, and completes heat exchange with the cold salt in the tank through the salt distributor 5. The above heating steps are repeated until the preset temperature is reached, realizing the energy storage of hot molten salt.

[0045] (II) During non-off-peak electricity hours and when there is heating demand, the system operates in heat release mode only: First control valve 9, second control valve 10, third control valve 11, fifth control valve 13, and seventh control valve 15 are opened; fourth control valve 12, sixth control valve 14, first molten salt pump 7, and eighth control valve 16 are closed. Second molten salt pump 8 and circulation pump 6 are opened. The hot molten salt heated in the heat storage mode is pumped into the steam generator 3 via first control valve 9, fifth control valve 13, and second molten salt pump 8. It exchanges heat with the refrigerant flowing into the steam generator 3 via circulation pump 6. After absorbing heat, the refrigerant is delivered to the user for heat utilization. The cooled molten salt, after heat exchange, returns to the integrated heat storage / heat release tank 1 via third control valve 11. When the user's heat demand is high, eighth control valve 16 can be opened simultaneously to operate the steam boiler 4. The heat medium, heated by the steam boiler 4, can be supplied to the user via eighth control valve 16, achieving auxiliary heating.

[0046] (III) During off-peak electricity hours and when there is heating demand, the system operates in a simultaneous heat storage and release mode: The first control valve 9, second control valve 10, third control valve 11, fourth control valve 12, fifth control valve 13, sixth control valve 14, seventh control valve 15, first molten salt pump 7, second molten salt pump 8, and circulation pump 6 are activated; the eighth control valve 16 is closed. The molten salt stored in the integrated heat storage / release tank 1 is circulated through the first molten salt pump 7 and the molten salt electrode heating mechanism 2 to heat and store energy. Simultaneously, the heated molten salt in the integrated heat storage / release tank 1 is circulated through the second molten salt electrode heating mechanism 2. The hot molten salt output by the molten salt pump 8 is pumped into the steam generator 3 via the fifth control valve 13 and the second molten salt pump 8 to exchange heat with the refrigerant flowing through the steam generator 3. After absorbing heat, the refrigerant is delivered to the user end for heat utilization. If the heat energy used by the user end is less than the heat generated by the molten salt electrode heating mechanism 2, the output power of the molten salt electrode heating mechanism 2 is reduced or the excess heat is stored as latent heat in the integrated heat storage / heat release tank 1. If the heat energy used by the user end is greater than the heat generated by the molten salt electrode heating mechanism 2, the output power of the molten salt electrode heating mechanism 2 is increased or the eighth control valve 16 is opened to increase the load on the user end through the steam electric boiler 4. After heat exchange, the cold molten salt is pumped into the molten salt electrode heating mechanism 2 by the first molten salt pump 7 via the third control valve 11 and the fourth control valve 12 for heating and energy storage. The cold molten salt in the integrated heat storage / release tank 1 is combined with the cold molten salt after heat exchange via the second control valve 10 and pumped into the molten salt electrode heating mechanism 2 by the first molten salt pump 7 for heating, and then returned to the integrated heat storage / release tank 1 for storage. The parallel heat storage / release mode supplies energy to the user end by controlling the dynamic adjustment of the molten salt electrode heating system, thereby achieving efficient energy utilization.

[0047] (IV) Direct Heating Mode of Molten Salt Electrode Heating Mechanism: The third control valve 11, fourth control valve 12, fifth control valve 13, sixth control valve 14, seventh control valve 15, first molten salt pump 7, second molten salt pump 8, and circulation pump 6 are opened, while the first control valve 9, second control valve 10, and eighth control valve 16 are closed. The molten salt electrode heating mechanism 2 is in operation. The hot molten salt, heated by the molten salt electrode heating mechanism 2, passes through the sixth control valve 14 and fifth control valve 13, and is then pumped into the steam generator 3 by the second molten salt pump 8 to exchange heat with the cold medium flowing through the steam generator 3. The cooled molten salt, after heat exchange, passes through the third control valve 11 and fourth control valve 12, and is pumped into the molten salt electrode heating mechanism 2 by the first molten salt pump 7 for further heating. The energy of the molten salt electrode heating mechanism is exchanged with the heat exchanger in the steam generator to provide heat to the user. When the user's heat transfer medium demand is high, the output power of the molten salt electrode heating mechanism 2 is adjusted to meet the user's heating load; or the eighth control valve 16 is opened simultaneously to operate the steam electric boiler 4, and some refrigerant can be supplied to the user after being heated by the steam electric boiler 4 through the eighth control valve 16. This utility model system has grid compatibility, adopts four operating modes to adapt to peak-valley electricity pricing policies, and has significant economic benefits in peak shaving and valley filling.

[0048] The above are preferred embodiments of the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present utility model, and these improvements and modifications should also be considered within the protection scope of the present utility model.

Claims

1. A peak-valley electricity heat storage / heat release integrated single-tank molten salt electrode heat supply system, characterized in that, include: A single tank integrating heat storage / heat release (1) is provided with a hot medium port at the top and a cold medium port at the bottom; Molten salt electrode heating mechanism (2); Steam generator (3), steam electric boiler (4); First molten salt pump (7), second molten salt pump (8), circulation pump (6); in: The heat medium inlet of the integrated heat storage / heat release tank (1) is connected in series with the first control valve (9), and then connected in parallel with the sixth control valve (14) and the fifth control valve (13); the sixth control valve (14) is connected to the outlet of the molten salt electrode heating mechanism (2); the fifth control valve (13) is connected in series with the second molten salt pump (8) and then connected to the hot side inlet of the steam generator (3); The cold medium port of the integrated heat storage / heat release tank (1) is connected in series with the second control valve (10), and then in parallel with the fourth control valve (12) and the third control valve (11); the fourth control valve (12) is connected in series with the first molten salt pump (7) and then connected to the inlet of the molten salt electrode heating mechanism (2); the third control valve (11) is connected to the cold side outlet of the steam generator (3); The cold medium inlet of the steam electric boiler (4) is connected in parallel with the seventh control valve (15) and the eighth control valve (16); the seventh control valve (15) is connected to the cold side outlet of the steam generator (3); the eighth control valve (16) is connected in series with the circulating pump (6) and then connected to an external cold medium source.

2. The peak-valley electricity heat storage / heat release integrated single-tank molten salt electrode heat supply system according to claim 1, characterized in that, The molten salt electrode heating mechanism (2) includes a housing (201) and a partition cover (210) sealed to the top of the housing. A molten salt heating chamber (203) is provided inside the housing (201), and a heat insulation layer (202) is provided on the inner wall of the housing (201). The molten salt heating chamber (203) is provided with a phase electrode (204), a zero-position electrode (205), and a lifting and adjusting support base (209). The support base (209) is connected to the power drive mechanism (208) and is provided with a spray pipe (206) at the bottom for aligning with the electrode area. High-voltage alternating current is connected to the phase electrode (204) through the insulation mechanism (207), and the heating power is controlled by adjusting the rise and fall of the support base (209) to change the relative contact area of ​​the electrode.

3. The peak-valley electricity heat storage / heat release integrated single-tank molten salt electrode heat supply system according to claim 2, characterized in that, The combined phase electrode (204) and zero electrode (205) include multiple sets arranged circumferentially along the central axis of the partition cover plate (210); the top of the phase electrode (204) is provided with an electrode connecting rod (215) that penetrates the partition cover plate (210), and the insulation mechanism (207) is correspondingly connected to the top of the electrode connecting rod (215); The support base (209) has a drive link (214) in the center, which passes through the partition cover (210) and is connected to the power drive mechanism (208) for transmission.

4. The peak-valley electricity heat storage / heat release integrated single-tank molten salt electrode heat supply system according to claim 3, characterized in that, The drive link (214) is a transmission rack, and the power drive mechanism (208) includes a drive motor and a drive gear correspondingly disposed at the shaft end of the drive motor, and the drive gear meshes with the transmission rack for transmission connection.

5. The peak-valley electricity heat storage / heat release integrated single-tank molten salt electrode heat supply system according to claim 3, characterized in that, The drive link (214) is a transmission lead screw, and the power drive mechanism (208) includes a drive motor and a lead screw sleeve correspondingly disposed on the shaft end of the drive motor. The lead screw sleeve is correspondingly connected to the transmission lead screw.

6. The peak-valley electricity heat storage / heat release integrated single-tank molten salt electrode heat supply system according to claim 1, characterized in that, The integrated heat storage / heat release tank (1) is equipped with multiple salt distributors (5) along the height direction. Each salt distributor (5) has multiple salt distribution holes evenly distributed along its radial direction on its surface. PTC heating elements are distributed at intervals on the upper and lower sides of the salt distributor (5). The PTC heating elements are connected to a temperature controller. The temperature controller adjusts the working status of the heating elements in real time and monitors the temperature of the molten salt in real time.

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