A high-efficiency heat storage device

Abstract

The present invention relates to the field of thermoelectric heating technology, and in particular to an efficient heat storage device for boiler peak load regulation and heat storage. The efficient heat storage device includes a steam regulation and metering unit, a steam-water heat exchange unit, a high-performance heat storage unit, an exhaust steam recovery unit, a hot water output unit, and a matching instrument monitoring system. The present invention meets the needs of peak load regulation, heat storage, and water storage and replenishment of coal-fired boilers, broadens the load regulation range of the boiler, and enhances the risk resistance of the boiler water treatment system. The waste heat and waste heat of the boiler at low load can be efficiently stored in a hot water storage tank within a certain period of time, and output to the outside at high load, which can effectively avoid the exhaust phenomenon of the boiler at ultra-low load operation and enhance the heating capacity of the boiler at high load.

Description

Technical Field

[0001] The invention relates to the technical field of thermoelectric heating, and in particular to a high-efficiency heat storage device for boiler peak regulation and heat storage. Background Art

[0002] The current large-scale abandonment of wind and solar power caused by the "conflict between wind, solar and heat" has become one of the important factors restricting the development of new energy in my country, which is contrary to my country's goal of "carbon peak and carbon neutrality". The reason is that the peak-shaving capacity of thermal power units is greatly reduced due to the constraint of "heat-to-electricity" during heating. In addition, a large part of my country's regional centralized heating boiler rooms have to exhaust steam to the air during low-load periods due to the significant day-and-night changes in downstream heat load demand, resulting in huge energy waste and an increase in the total emissions of atmospheric pollutants and carbon dioxide. Therefore, under the condition of meeting the heating demand, it is one of the important means to build a green, low-carbon, circular development economic system in my country to carry out flexible transformation of thermal power units or large centralized heating boilers, improve the peak-shaving capacity of thermal power units, greatly improve the wind power absorption capacity, and reduce unnecessary fossil energy consumption.

[0003] Using hot water storage tanks to reduce load fluctuations and fill peaks is one of the important means of flexibility transformation of thermal power units or large-scale central heating boilers. However, most of the existing hot water storage tanks are independent of the steam turbine extraction heat exchange system and the boiler water supply system. The heat storage device and the heat exchange system only exchange heat but not water. The water volume in the tank remains constant and is not output to the outside, which weakens the heat storage capacity of the heat storage device to a certain extent. At the same time, the exhaust steam after the heat exchange between steam and the cooling medium is directly discharged, and the energy recovery rate needs to be further improved. Summary of the invention

[0004] The purpose of the present invention is to propose a high-efficiency heat storage device that can be used for both boiler peak regulation and water replenishment. By decoupling the "heat-to-electricity" constraint through heat storage, the flexible operation of the thermal power unit can be realized, the exhaust steam to the air under low load of the boiler can be recovered, and high-temperature desalinated hot water can be output during high load periods. While completing the heat release, the feed water required by the boiler can be replenished, which greatly broadens the load regulation range of the coal-fired unit and enhances the risk resistance of the boiler water treatment system.

[0005] In view of the above technical problems, the present invention proposes a high-efficiency heat storage device that can solve the above problems. To achieve the above technical objectives, the technical solution of the present invention is implemented as follows:

[0006] A high-efficiency heat storage device comprises a high-efficiency steam-water heat exchanger for high-efficiency heat exchange, wherein the top steam inlet of the high-efficiency steam-water heat exchanger is connected with the steam inlet pipeline; a steam regulating valve group, a temperature monitoring device, a steam metering device and a pressure monitoring device are sequentially arranged on the outer side of the pipe wall of the steam inlet pipeline downward along the length direction; a spare valve is arranged across the steam regulating valve group on the outer side of the pipe wall of the steam inlet pipeline; the bottom drain outlet of the high-efficiency steam-water heat exchanger is connected with the top drain inlet of the heat storage tank through a hot drain pipeline; the top hot brine outlet of the high-efficiency steam-water heat exchanger penetrates from the heat storage tank along the outer wall vertically into the tank through a hot desalted water pipeline, reaches the vicinity of the center line of the inner diameter of the tank and extends in a vertical downward direction to above the exhaust steam condensing coil, penetrates along the inner wall of the heat storage tank vertically and is connected with the cold brine inlet of the desalted water tank; the cold brine outlet on the other side of the desalted water tank is connected to the cold brine inlet at the bottom of the high-efficiency steam-water heat exchanger through a cold desalted water pipeline The heat storage tank is connected to the heat storage tank; one end of the exhaust steam recovery pipeline penetrates into the tank along the outer side of the top of the heat storage tank in a vertical direction and is connected to the exhaust steam condensing coil arranged on the bottom surface; the breathing valve is arranged on the top of the heat storage tank; the lower end of the heat storage tank is provided with a drain port connected to the drain pipeline, and the standby valve and the water pump are arranged in sequence along the length direction of the drain pipeline; the heat storage tank comprises a steel structure body, an outer insulation layer and an inner anti-corrosion layer; the outer insulation layer comprises a hard polyurethane foam material sprayed on the side wall and the top of the outer side of the steel structure body, and the thickness of the outer insulation layer is 80-100 mm; the inner anti-corrosion layer comprises an epoxy zinc-rich primer and an epoxy topcoat material applied on the inner side of the steel structure body, and the thickness of the inner anti-corrosion layer is 40-100 μm; the bottom thermal insulation coating (15) is a thermal insulation coating made of hollow glass microspheres sprayed on the outer side of the bottom steel plate of the steel structure body (13), and the thickness of the bottom thermal insulation coating (15) is 1-2 mm.

[0007] Furthermore, the steam regulating valve group includes 2 spare valves and 1 solenoid valve.

[0008] Furthermore, a temperature monitoring device, a pressure monitoring device and a backup valve are sequentially arranged along the length direction of the hot drain pipeline from the bottom water outlet of the high-efficiency steam-water heat exchanger.

[0009] Furthermore, a solenoid valve, a temperature monitoring device and a pressure monitoring device are sequentially arranged along the length direction of the cold desalted water pipeline of the desalted water tank.

[0010] Furthermore, a pressure monitoring device, a temperature monitoring device and a backup valve are sequentially arranged along the length direction of the hot desalted water pipeline of the desalted water tank.

[0011] Furthermore, a pressure monitoring device and a temperature monitoring device are sequentially arranged on the upper outer side of the heat storage tank in a vertical downward direction along the wall surface.

[0012] Furthermore, a temperature monitoring device is provided in the middle of the outer side of the heat storage tank in a direction perpendicular to the wall surface.

[0013] Furthermore, a liquid level monitoring device and a temperature monitoring device are sequentially arranged on the lower outer side of the heat storage tank in a vertically upward direction along the wall surface.

[0014] Furthermore, the exhaust steam recovery pipeline (9) and the hot desalted water pipeline are sealedly connected to the steel structure body of the heat storage tank.

[0015] Furthermore, the water temperature in the desalted water tank (20) is room temperature.

[0016] The beneficial effects of the present invention are:

[0017] The high-efficiency heat storage device in the present invention adopts an external steam-water indirect heat exchange method, which meets the needs of peak-shaving heat storage and water storage and replenishment of coal-fired boilers, and efficiently transfers the heat of the excess exhaust steam of the boiler to the desalted water, avoiding the noise and vibration problems of direct mixing and heat exchange of steam and cold water; the breathing valve on the top of the heat storage tank ensures a slight positive pressure inside the tank to prevent the infiltration of oxygen in the air. At the same time, the exhaust steam recovery system composed of the exhaust steam recovery pipeline and the exhaust steam condensing coil allows the heat of the steam to be fully recycled and utilized, while the inner anti-corrosion layer, the outer insulation layer and the bottom insulation layer ensure the high-quality and high-efficiency heat storage of the hot desalted water in the water tank. The output hot water is connected to the deaerator system, which can flexibly output heat and high-quality replenishment water to the outside, enhance the risk resistance of the water treatment system, and facilitate the inspection and maintenance of the heat storage device. The high-efficiency heat storage device in the present invention has stable performance and good economy, which is conducive to the flexible transformation of thermal power units. At the same time, the excess exhaust steam and heat of the boiler under low load are recovered to the greatest extent, and heat is released during high load periods, reducing the self-consumption of steam used by the deaerator to heat desalted water, broadening the load adjustment range of the boiler and enhancing the risk resistance of the boiler water treatment system. The waste heat of the boiler under low load can be efficiently stored in the hot water storage tank within a certain period of time and output to the outside under high load, which can effectively avoid the exhaust phenomenon of the boiler under ultra-low load operation and enhance the overall heating capacity of the unit under high load. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0019] Figure 1 A schematic diagram of the composition of a high-efficiency heat storage device.

[0020] Figure 2 Schematic diagram of the structure of the heat storage tank.

[0021] In the figure: 1. Steam inlet pipeline; 2. Steam regulating valve group; 3. Steam metering device; 4. High-efficiency steam-water heat exchanger; 5. Hot drain pipeline; 6. Cold desalted water pipeline; 7. Hot desalted water pipeline; 8. Heat storage tank; 9. Exhaust steam recovery pipeline; 10. Breathing valve; 11. Exhaust steam condensing coil; 12. Outer insulation layer; 13. Steel structure body; 14. Inner anti-corrosion layer; 15. Bottom insulation coating; 16. Water pump; 17. Pressure monitoring equipment; 18. Temperature monitoring equipment; 19. Liquid level monitoring equipment; 20. Desalted water tank; 21. Spare valve; 22. Drain pipeline; 23. Solenoid valve. DETAILED DESCRIPTION

[0022] The following will be combined with the accompanying drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field belong to the scope of protection of the present invention.

[0023] Example 1: Figure 1-2As shown, a high-efficiency heat storage device is characterized in that it includes a high-efficiency steam-water heat exchanger 4 for high-efficiency heat exchange, and while achieving high-efficiency heat exchange in the high-efficiency steam-water heat exchanger 4, the problem of easy scaling and reduced heat exchange efficiency of traditional heat exchangers during long-term operation is avoided; the steam inlet at the top of the high-efficiency steam-water heat exchanger 4 is connected to the steam inlet pipeline 1; a steam regulating valve group 2, a temperature monitoring device 18, a steam metering device 3 and a pressure monitoring device 17 are sequentially arranged on the outer side of the pipe wall of the steam inlet pipeline 1 in the length direction downward; the steam regulating valve group 2 can be remotely dynamically adjusted in real time according to the steam metering device 3 to control the steam entering the high-efficiency steam-water heat exchanger 4 Steam parameters; a spare valve 21 is provided on the outer side of the pipe wall of the steam inlet pipeline 1 across the steam regulating valve group 2; the bottom drain outlet of the high-efficiency steam-water heat exchanger 4 is connected to the drain inlet at the top of the heat storage tank 8 through the hot drain pipeline 5, and the high-temperature and high-pressure condensed hot water enters the space above the heat storage tank 8 through the hot drain pipeline 5 to complete the pressure relief, and the saturated hot water flows into the inside of the heat storage tank 8; the hot water in the hot drain pipeline 5 has a certain pressure, and it will inevitably flash out a part of the steam when entering the heat storage tank 8. Under the action of the breathing valve 10, the steam fills the waterless space above the heat storage tank 8, isolates the oxygen in the air, and inhibits the occurrence of corrosion inside the heat storage tank 8. The steam is transported to the exhaust steam condensing coil 11 through the exhaust steam recovery pipeline 9 to complete condensation and heat dissipation, and is finally stored in the heat storage tank 8 in the form of liquid, which guarantees the recovery of heat and heat storage to the greatest extent, and avoids the waste caused by the direct discharge of exhaust steam in traditional heat exchange. The hot brine outlet at the top of the high-efficiency steam-water heat exchanger 4 passes through the hot desalted water pipeline 7 from the heat storage tank 8 along the outer wall vertical direction into the tank, reaches the vicinity of the center line of the tank inner diameter and extends vertically downward to the top of the exhaust steam condensing coil 11, passes out vertically along the inner wall of the heat storage tank 8 and is connected with the cold brine inlet of the desalted water tank 20, and the water temperature in the desalted water tank 20 is room temperature; the cold brine outlet on the other side of the desalted water tank 20 is connected with the cold brine inlet at the bottom end of the high-efficiency steam-water heat exchanger 4 through the cold desalted water pipeline 6; the cooling medium of the steam-water heat exchanger 4 is desalted water, and the cooled medium is steam, which avoids the scaling and heat exchange efficiency reduction problems caused by long-term operation of the steam-water heat exchanger 4, and can ensure that the steam-water heat exchanger 4 always maintains a high heat exchange efficiency. At the same time, after heat exchange in the steam-water heat exchanger 4, the heat in the steam is transferred to the hot drain and hot desalted water, and transported to the heat storage tank 8 through the hot drain pipeline 5 and the hot desalted water pipeline 7 respectively, without water hammer, noise and vibration, which is beneficial to the service life of the heat storage device.The indirect heat exchange method with the high-efficiency steam-water heat exchanger 4 as the core is to transport heat to the heat storage tank 8 for storage through the hot drain pipe 5 and the hot desalted water pipe 7, which solves the noise and vibration problems caused by water hammer in the direct heat exchange between steam and cold water, and has the advantages of noise reduction and stable structure; one end of the exhaust steam recovery pipe 9 penetrates into the tank along the outer side of the top of the heat storage tank 8 in the vertical direction, and is connected to the exhaust steam condensing coil 11 arranged on the bottom surface. The exhaust steam condensing coil 11 made of stainless steel is arranged in the bottom space inside the water tank, and the exhaust steam condensing coil 11 outlet is located at the liquid The flashed steam enters the exhaust steam condensing coil 11 through the exhaust steam recovery pipeline 9, and the hot water is stored in the heat storage tank 8 after condensation. Compared with the direct discharge of steam, the maximum heat recovery can be achieved; the breathing valve 10 is arranged on the top of the heat storage tank 8, and the flashed steam fills the water-free space above the heat storage tank 8. Under the action of the breathing valve 10, the pressure inside the tank body is kept balanced, and air is prevented from leaking into the heat storage tank 8, thereby increasing the corrosion resistance of the inner wall and reducing the dissolved oxygen concentration in the water; the lower end of the heat storage tank 8 is provided with a drain port connected to the drain pipe 22. The standby valve 21 and the water pump 16 are sequentially arranged along the length direction from the drainage pipe 22; the heat storage tank 8 includes a steel structure body 13, an outer insulation layer 12 and an inner anti-corrosion layer 14; the outer insulation layer 12 includes a hard polyurethane foam material sprayed on the side wall and the top of the outer side of the steel structure body 13, and the thickness of the outer insulation layer 12 is 80-100mm; the insulation technology has the characteristics of low thermal conductivity, waterproof, fire resistance and flame retardancy; the inner anti-corrosion layer 14 includes a hard polyurethane foam material sprayed on the bottom, side wall and top area of ​​the inner side of the steel structure body 13. Epoxy zinc-rich primer and epoxy topcoat materials, the thickness of the inner anti-corrosion layer 14 is 40~100μm, with high water resistance, high heat resistance and high chemical stability, which can effectively prevent the hot water in the tank from chemically corroding the main structure of the heat storage tank 8, and has the characteristics of indirect heat exchange between steam and water without water hammer and small disturbance, which can ensure that the wall is durable and corrosion-free for a long time, and at the same time, it can also ensure that the desalted water does not deteriorate after heat storage, ensuring that the boiler feed water meets the standards; compared with the existing technical solutions, the inner anti-corrosion layer 14 is economical, practical, heat-resistant, water-resistant, wear-resistant, corrosion-resistant and fast-drying. The bottom thermal insulation coating 15 is a thermal insulation coating formed by spraying hollow glass microsphere thermal insulation coating on the outer side of the bottom steel plate of the steel structure body 13. The thickness of the bottom thermal insulation coating 15 is 1-2 mm. The bottom thermal insulation coating 15 has the characteristics of good pressure resistance, low thermal conductivity, good electrical insulation and thermal stability, which solves the insulation problem of the tank bottom under the existing construction process, maximizes the thermal insulation and heat storage efficiency of the heat storage device, and has strong flexibility and crack resistance and very low thermal conductivity. The outer thermal insulation layer 12 and the bottom thermal insulation coating 15 can ensure that the temperature of the hot water in the heat storage tank 8 drops within 5°C / 24h, greatly improving the heat storage efficiency of the heat storage device.The steam regulating valve group 2 includes two spare valves 21 and one solenoid valve 23; a temperature monitoring device 18, a pressure monitoring device 17 and a spare valve 21 are sequentially arranged along the length direction on the hot drain pipe 5 from the bottom outlet of the high-efficiency steam-water heat exchanger 4; a solenoid valve 23, a temperature monitoring device 18 and a pressure monitoring device 17 are sequentially arranged along the length direction on the cold desalted water pipe 6 of the desalted water tank 20. The hot desalted water pipeline 7 of the desalted water tank 20 is provided with a pressure monitoring device 17, a temperature monitoring device 18 and a backup valve 21 in sequence along the length direction; the pressure monitoring device 17 and the temperature monitoring device 18 are provided in sequence on the upper outer side of the heat storage tank 8 along the vertical downward direction of the wall surface to monitor the pressure and temperature of the waterless space above the tank body; the temperature monitoring device 18 is provided on the middle outer side of the heat storage tank 8 along the vertical direction of the wall surface; the liquid level monitoring device 19 and the temperature monitoring device 18 are provided in sequence on the lower outer side of the heat storage tank 8 along the vertical upward direction of the wall surface; the exhaust steam recovery pipeline 9 and the hot desalted water pipeline 7 are sealed and connected to the steel structure main body 13. The high-efficiency steam inlet pipeline 1, the hot drain outlet pipeline 5, the cold desalted water pipeline 6 and the hot desalted water pipeline 7 are all equipped with temperature monitoring equipment 18, pressure monitoring equipment 17 and valve adjustment measures, which can monitor the working state of the high-efficiency steam-water heat exchanger 4 in real time and adjust the flow rate; the cooling medium of the high-efficiency steam-water heat exchanger 4 is desalted water and the cooled medium is steam, which avoids the scaling and heat exchange efficiency reduction problems caused by the long-term operation of the heat exchanger, and can ensure that the steam-water heat exchanger 4 always maintains a high heat exchange efficiency. At the same time, after heat exchange by the high-efficiency steam-water heat exchanger 4, the heat in the steam is transferred to the hot drain and hot desalted water, and is transported to the heat storage tank 8 through the hot drain pipeline 5 and the hot desalted water pipeline 7 respectively, without water hammer, noise and vibration, which is beneficial to the service life of the heat storage device. The hot water in the hot drain pipeline 5 has a certain pressure, and it will inevitably flash out a part of the steam when entering the heat storage tank 8. Under the action of the breathing valve 10, the steam fills the waterless space above the heat storage tank 8, isolates the oxygen in the air, and inhibits the occurrence of corrosion inside the tank. The steam is transported to the exhaust steam condensing coil 11 through the exhaust steam recovery pipeline 9 to complete condensation and heat dissipation, and is finally stored in the heat storage tank 8 in the form of liquid, which ensures heat recovery and heat storage to the greatest extent and avoids the waste caused by direct exhaust steam discharge in traditional heat exchange.

[0024] The high-efficiency heat storage device in the present invention adopts an external steam-water indirect heat exchange method, which meets the needs of peak-shaving heat storage and water storage and replenishment of coal-fired boilers, and efficiently transfers the heat of the excess exhaust steam of the boiler to desalted water, avoiding the noise and vibration problems of direct mixing and heat exchange of steam and cold water; the output hot water is connected to the deaerator system, which can flexibly output heat and high-quality make-up water to the outside, enhance the risk resistance of the water treatment system, and facilitate the inspection and maintenance of the heat storage device. The high-efficiency heat storage device in the present invention has stable performance and good economy, which is conducive to the flexible transformation of thermal power units. At the same time, the excess exhaust steam and heat of the boiler under low load are recovered to the greatest extent, and heat is released during high load periods, which reduces the self-consumption of steam used by the deaerator to heat the desalted water, broadens the load adjustment range of the boiler, enhances the risk resistance of the boiler water treatment system, can effectively avoid the exhaust phenomenon of the boiler under ultra-low load operation, and enhance the overall heating capacity of the unit when the boiler is under high load.

[0025] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A high-efficiency heat storage device, characterized in that: It comprises a high-efficiency steam-water heat exchanger (4) for high-efficiency heat exchange, wherein the steam inlet at the top of the high-efficiency steam-water heat exchanger (4) is connected to a steam inlet pipeline (1); a steam regulating valve group (2), a temperature monitoring device (18), a steam metering device (3) and a pressure monitoring device (17) are sequentially arranged on the outer side of the pipe wall of the steam inlet pipeline (1) downward along the length direction; a spare valve (21) is arranged on the outer side of the pipe wall of the steam inlet pipeline (1) across the steam regulating valve group (2); the bottom drain outlet of the high-efficiency steam-water heat exchanger (4) is connected to the top drain inlet of the heat storage tank (8) through a hot drain pipeline (5); The hot brine outlet at the top of the high-efficiency steam-water heat exchanger (4) passes through the hot desalted water pipeline (7) from the heat storage tank (8) along the outer wall vertically into the tank, reaches the vicinity of the center line of the inner diameter of the tank and extends vertically downward to the top of the exhaust steam condensing coil (11), passes through the inner wall of the heat storage tank (8) vertically and is connected to the cold brine inlet of the desalted water tank (20); the cold brine outlet on the other side of the desalted water tank (20) is connected to the cold brine inlet at the bottom of the high-efficiency steam-water heat exchanger (4) through the cold desalted water pipeline (6); one end of the exhaust steam recovery pipeline (9) passes through the outer side of the top of the heat storage tank (8) vertically into the tank, The heat storage tank (8) is connected to the exhaust steam condensing coil (11) arranged on the bottom surface; the breathing valve (10) is arranged on the top of the heat storage tank (8); the lower end of the heat storage tank (8) is provided with a drain port connected to the drain pipe (22), and a spare valve (21) and a water pump (16) are arranged in sequence along the length direction from the drain pipe (22); the heat storage tank (8) comprises a steel structure body (13), an outer insulation layer (12) and an inner anti-corrosion layer (14); the outer insulation layer (12) comprises a hard polyurethane foam material sprayed on the side wall and the top of the outer side of the steel structure body (13), and the thickness of the outer insulation layer (12) is 80~100mm; the inner anti-corrosion layer (14) includes epoxy zinc-rich primer and epoxy topcoat materials applied on the inner side of the steel structure body (13), and the thickness of the inner anti-corrosion layer (14) is 40~100μm; the bottom thermal insulation coating (15) is sprayed on the outer side of the bottom steel plate of the steel structure body (13) using hollow glass microsphere thermal insulation coating, and the thickness of the bottom thermal insulation coating (15) is 1~2mm. The outlet of the exhaust steam condensing coil (11) is located below the liquid surface and connected to water. The flashed steam enters the exhaust steam condensing coil (11) through the exhaust steam recovery pipeline (9), and the hot water after condensation is stored in the heat storage tank (8).

2. A high-efficiency heat storage device according to claim 1, characterized in that: The steam regulating valve group (2) includes two spare valves (21) and one solenoid valve (23).

3. A high-efficiency heat storage device according to claim 1, characterized in that: A temperature monitoring device (18), a pressure monitoring device (17) and a spare valve (21) are sequentially arranged along the length direction on the hot drain pipe (5) from the water outlet at the bottom end of the high-efficiency steam-water heat exchanger (4).

4. The high-efficiency heat storage device according to claim 1, characterized in that: A solenoid valve, a temperature monitoring device (18) and a pressure monitoring device (17) are sequentially arranged on the cold demineralized water pipeline (6) of the demineralized water tank (20) along the length direction.

5. The high-efficiency heat storage device according to claim 1, characterized in that: A pressure monitoring device (17), a temperature monitoring device (18) and a backup valve (21) are sequentially arranged along the length direction on the hot desalted water pipeline (7) of the desalted water tank (20).

6. A high-efficiency heat storage device according to claim 1, characterized in that: A pressure monitoring device (17) and a temperature monitoring device (18) are sequentially arranged on the upper outer side of the heat storage tank (8) along the wall in a vertical downward direction.

7. The high-efficiency heat storage device according to claim 1, characterized in that: A temperature monitoring device (18) is provided in the middle of the outer side of the heat storage tank (8) along a direction perpendicular to the wall surface.

8. The high-efficiency heat storage device according to claim 1, characterized in that: A liquid level monitoring device (19) and a temperature monitoring device (18) are sequentially arranged on the lower outer side of the heat storage tank (8) along the wall in a vertically upward direction.

9. The high-efficiency heat storage device according to claim 1, characterized in that: The exhaust steam recovery pipeline (9) and the hot desalted water pipeline (7) are sealedly connected to the steel structure main body (13).

10. The high-efficiency heat storage device according to claim 1, characterized in that: The water temperature in the desalted water tank (20) is room temperature.

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