An electric thermal energy storage steam supply system

Abstract

The present invention is an electric thermal energy storage steam supply system, comprising an electric heater, a heat storage spherical tank, a circulating pump group, a steam dryer and a steam cylinder; characterized in that the water supply inlet at the upper part of the electric heater is connected to an external deoxygenated water supply device, the saturated water outlet at the upper end of the electric heater is connected to the saturated water inlet at the upper part of the heat storage spherical tank, and the circulating water outlet at the lower end of the heat storage spherical tank is connected to the recirculating water inlet at the lower end of the electric heater through the circulating pump group; the heat storage spherical tank is not filled with high-temperature and high-pressure saturated water, leaving flash space; the steam outlet at the upper end of the heat storage spherical tank is connected to the steam inlet of the steam dryer, and the steam outlet of the steam dryer is connected to the steam cylinder. The high-temperature and high-pressure saturated water is directly stored in the heat storage spherical tank, reducing a "flash tank", having the energy to automatically adjust the pressure and flow, increasing the system energy storage capacity while reducing the system operation cost, and also ensuring the stability of steam supply.

Description

Technical Field

[0001] The invention belongs to the technical field of heat storage and energy saving, and specifically relates to an electric thermal energy storage steam supply system. Background Art

[0002] In recent years, as global warming intensifies, issues such as reducing the use of fossil energy and reducing greenhouse gas emissions have attracted much attention. Renewable energy generation technologies such as wind and solar energy have emerged and have developed unprecedentedly, while also bringing huge challenges to the stability of the power grid. The problem of wind and solar power consumption has also become increasingly prominent, and the phenomenon of wind and solar power abandonment is widespread, causing great energy waste and economic losses. Energy storage technology provides a possibility for reducing energy waste and increasing energy utilization.

[0003] Most of the existing thermal energy storage uses steam accumulators to store and release steam to complete energy conversion and utilization. However, this method has the following shortcomings: 1. The accumulator has poor heat storage capacity and small storage energy; 2. The steam accumulator acts as a steam energy storage tank on the surface, but it is actually equivalent to a steam buffer tank, which stores steam; 3. Steam is first converted from gas to liquid in the accumulator, and then from liquid to gas, which requires two conversions, resulting in a lot of heat loss.

[0004] In view of the above factors, the present invention proposes an electric thermal energy storage steam supply system. Summary of the invention

[0005] In view of the deficiencies in the prior art, the technical problem to be solved by the present invention is to provide an electric thermal energy storage steam supply system.

[0006] The technical solution adopted by the present invention to solve the technical problem is as follows:

[0007] An electric thermal energy storage steam supply system comprises an electric heater, a heat storage spherical tank, a circulating pump group, a steam dryer and a steam cylinder; characterized in that the water supply inlet at the upper part of the electric heater is connected to an external deoxygenated water supply device, the saturated water outlet at the upper end of the electric heater is connected to the saturated water inlet at the upper part of the heat storage spherical tank, and the circulating water outlet at the lower end of the heat storage spherical tank is connected to the recirculating water inlet at the lower end of the electric heater through the circulating pump group; the heat storage spherical tank is not filled with high-temperature and high-pressure saturated water, leaving flash evaporation space; the steam outlet at the upper end of the heat storage spherical tank is connected to the steam inlet of the steam dryer, and the steam outlet of the steam dryer is connected to the steam cylinder;

[0008] The sub-cylinders include a high-pressure sub-cylinder and a low-pressure sub-cylinder; the steam inlet of the high-pressure sub-cylinder is connected to the original steam supply equipment, the steam outlet of the high-pressure sub-cylinder is connected to the steam inlet of the low-pressure sub-cylinder, the steam inlet of the low-pressure sub-cylinder is also connected to the steam outlet of the steam dryer, and the steam outlet of the low-pressure sub-cylinder is connected to the hot side; the steam outlet end of the high-pressure sub-cylinder is provided with a No. 1 automatic regulating valve, and the steam inlet end of the low-pressure sub-cylinder is provided with a No. 2 automatic regulating valve;

[0009] The system has the function of automatically adjusting pressure and flow. When the pressure is automatically adjusted, the No. 1 automatic regulating valve is controlled by two pressure signals before and after the valve, and the No. 2 automatic regulating valve plays a role in reducing pressure. When the pressure in the high-pressure sub-cylinder rises to a given value, the No. 1 automatic regulating valve is automatically opened by the pressure signal before the valve, and the No. 2 automatic regulating valve is opened at the same time to transport the steam in the high-pressure sub-cylinder to the low-pressure sub-cylinder, thereby reducing the pressure in the high-pressure sub-cylinder. When the pressure in the high-pressure sub-cylinder drops below the given value, the No. 1 automatic regulating valve is automatically closed, and the high-pressure sub-cylinder stops transporting steam. In this process, the role of the No. 1 automatic regulating valve is to maintain the pressure stability of the original steam supply equipment. When the steam supplied in the heat storage spherical tank is insufficient to meet the demand on the heat-using side, even if the pressure of the original steam supply equipment is lower than the given value, the No. 1 automatic regulating valve is automatically opened by the pressure signal after the valve, and the No. 2 automatic regulating valve is opened at the same time to transport the steam in the high-pressure sub-cylinder to the low-pressure sub-cylinder, thereby ensuring the steam supply capacity of the low-pressure sub-cylinder. In this process, the role of the No. 1 automatic regulating valve is to ensure the demand on the heat-using side.

[0010] When the heat-using side starts to use steam, when the pressure in the low-pressure steam cylinder drops to a given value, the No. 1 automatic regulating valve and the No. 2 automatic regulating valve are immediately opened to supply steam; when the steam supply of the high-pressure steam cylinder is greater than the steam consumption on the heat-using side, the pressure in front of the No. 2 automatic regulating valve rises, at which time the opening of the No. 2 automatic regulating valve decreases, and the opening of the No. 1 automatic regulating valve is also affected by the increase in the pressure behind the valve, and the opening of the No. 2 automatic regulating valve decreases accordingly; when the steam consumption on the heat-using side is greater than the steam supply of the high-pressure steam cylinder, the pressure in front of the No. 2 automatic regulating valve decreases, and the opening of the No. 2 automatic regulating valve increases. At the same time, the high-temperature and high-pressure saturated water in the heat storage spherical tank flashes to generate steam, which supplies steam to the heat-using side to ensure that the pressure in the low-pressure steam cylinder is constant;

[0011] When the flow rate is automatically adjusted, the amount of steam delivered by the system to the heat-using side remains constant. At this time, the No. 1 automatic regulating valve is an automatic pressure regulating valve, the No. 2 automatic regulating valve is an automatic flow regulating valve, and a flow orifice is provided between the No. 2 automatic regulating valve and the low-pressure steam sub-cylinder. The system compares the pressure difference before and after the flow orifice with a given value, and generates a pulse signal to control the opening of the No. 2 automatic regulating valve. When the steam supply directly from the high-pressure steam sub-cylinder is balanced with the steam consumption on the heat-using side, the steam in the high-pressure steam sub-cylinder enters directly through the No. 1 automatic regulating valve, the No. 2 automatic regulating valve and the flow orifice. into the low-pressure steam cylinder; when the steam supply of the high-pressure steam cylinder is greater than the steam consumption on the heat-using side, the pressure difference before and after the flow orifice plate becomes larger, at this time the system controls the opening of the No. 2 automatic regulating valve to decrease, so that the pressure difference before and after the flow orifice plate remains unchanged, and the opening of the No. 1 automatic regulating valve is reduced due to the increase in pressure after the valve; when the steam supply of the high-pressure steam cylinder is less than the steam consumption on the heat-using side, the pressure difference before and after the flow orifice plate becomes smaller, at this time the system controls the opening of the No. 2 automatic regulating valve to increase, and the high-temperature and high-pressure saturated water in the heat storage spherical tank flashes to generate steam to supply steam to the heat-using side.

[0012] Furthermore, a connecting pipe between the saturated water outlet of the electric heater and the saturated water inlet of the heat storage spherical tank extends into the heat storage spherical tank for a certain distance, and a ring-shaped or diamond-shaped bending portion is provided at the end of the pipe, and the bending portion is covered with water outlet holes.

[0013] Compared with the prior art, the present invention has the following beneficial effects:

[0014] (1) The electric heater of the present invention uses night-time off-peak electricity or abandoned wind and solar power as an energy source, converts low-quality electricity into high-quality thermal energy and stores it in high-temperature and high-pressure saturated water, thereby enhancing the absorption of clean energy and improving the stability of the power grid and the utilization rate of electricity. High-temperature and high-pressure saturated water is directly stored in the thermal storage spherical tank, which reduces a "flash tank" compared to the existing steam storage system. When there is a demand for heat on the heat-using side, the pressure in the steam pipe connected to the thermal storage spherical tank is reduced, and the high-temperature and high-pressure saturated water flashes in the upper space of the thermal storage spherical tank to generate steam. The stored heat is used in the form of high-temperature steam to heat the heat-using side, thereby increasing the system's energy storage capacity while reducing the system's operating costs. The thermal storage spherical tank, the electric heater, and the circulating pump group form a closed loop. When the temperature of the saturated water in the thermal storage spherical tank drops, the saturated water with a lowered temperature can be passed into the electric heater through the circulating pump group for reheating, and the night-time off-peak electricity can be used for long-term storage.

[0015] (2) The system of the present invention is directly connected to the heat-using side and the original steam supply equipment in the plant area, and has the ability to automatically adjust the pressure and flow rate, thereby ensuring both accurate operation of the system and stability of steam supply.

[0016] (3) Compared with the existing steam storage system, the heat storage medium in this system undergoes only one phase change, from liquid to gas, with less phase change, which improves the energy storage efficiency of the system, reduces the heat loss of the system, reduces the volume of the heat storage equipment accordingly, and reduces the system footprint. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0018] Figure 2 It is a schematic diagram of the structure of the automatic pressure adjustment of the present invention;

[0019] Figure 3 It is a schematic diagram of the structure of the automatic flow regulation of the present invention;

[0020] In the figure, 1. electric heater; 2. heat storage spherical tank; 3. circulating pump group; 4. steam dryer; 5. steam sub-cylinder; 6. bending part; 7. high-pressure steam sub-cylinder; 8. low-pressure steam sub-cylinder; 9. No. 1 automatic regulating valve; 10. No. 2 automatic regulating valve; 11. No. 1 check valve; 12. No. 1 stop valve; 13. No. 2 stop valve; 14. No. 2 check valve; 15. flow orifice plate. DETAILED DESCRIPTION

[0021] The specific embodiments are given below in combination with the embodiments and drawings. The specific embodiments are only used to further illustrate the technical solution of the present invention in detail, and do not limit the protection scope of the present application.

[0022] Reference Figure 1 The present invention provides an electric heat storage steam supply system, comprising an electric heater 1, a heat storage spherical tank 2, a circulating pump group 3, a steam dryer 4 and a steam cylinder 5;

[0023] The electric heater 1 is provided with a water supply inlet, a recirculating water inlet and a saturated water outlet; the water supply inlet of the electric heater 1 is connected to an external deoxygenated water supply device through a water supply pipe for introducing deoxygenated water; the saturated water outlet of the electric heater 1 is connected to the saturated water inlet on the upper part of the heat storage spherical tank 2 through a saturated water pipe, and a No. 1 check valve 11 and a No. 1 stop valve 12 are provided on the saturated water pipe. The No. 1 check valve 11 can prevent the high-temperature and high-pressure saturated water in the saturated water pipe from flowing back and causing water hammer when the electric heater 1 releases heat; the saturated water pipe extends into the heat storage spherical tank 2 for a distance, and the end of the saturated water pipe is provided with a ring-shaped or diamond-shaped bending portion 6, and the bending portion 6 is covered with water outlet holes. The high-temperature and high-pressure saturated water coming out of the electric heater 1 passes through The bent portion 6 enters the heat storage spherical tank 2 to avoid violent impact with the water stored in the heat storage spherical tank 2 and prevent the heat storage spherical tank 2 from vibrating; the circulating water outlet at the lower part of the heat storage spherical tank 2 is connected to the recirculating water inlet of the electric heater 1 through the circulating pump group 3, the steam outlet at the upper part of the heat storage spherical tank 2 is connected to the steam inlet of the steam dryer 4 through the steam pipe, and the steam outlet of the steam dryer 4 is connected to the steam cylinder 5 through the steam pipe. The steam outlet end of the heat storage spherical tank 2 is provided with a No. 2 stop valve 13 and a No. 2 check valve 14, and the No. 2 check valve 14 can prevent the steam from flowing back into the heat storage spherical tank 2 and causing the pressure of the gas space in the tank to increase; the heat storage spherical tank 2 is not full of high-temperature and high-pressure saturated water, and some space is reserved at the upper part for flash evaporation to generate steam;

[0024] The sub-cylinder 5 includes a high-pressure sub-cylinder 7 and a low-pressure sub-cylinder 8; the steam inlet of the high-pressure sub-cylinder 7 is connected to the original steam supply equipment (gas or coal) through a steam pipeline, the steam outlet of the high-pressure sub-cylinder 7 is connected to the steam inlet of the low-pressure sub-cylinder 8 through a steam pipeline, the steam inlet of the low-pressure sub-cylinder 8 is also connected to the steam outlet of the steam dryer 4, and the steam outlet of the low-pressure sub-cylinder 8 is connected to the hot side; the steam outlet end of the high-pressure sub-cylinder 7 is provided with a No. 1 automatic regulating valve 9, and the steam inlet end of the low-pressure sub-cylinder 8 is provided with a No. 2 automatic regulating valve 10.

[0025] The system of the present invention has the function of automatically adjusting pressure and flow; Figure 2Schematic diagram of the automatic pressure regulation structure. When the pressure is automatically regulated, the No. 1 automatic regulating valve 9 is controlled by the pressure signals before and after the valve, and the No. 2 automatic regulating valve 10 plays a role in reducing pressure. When the pressure in the high-pressure steam cylinder 7 rises to a given value, the No. 1 automatic regulating valve 9 is controlled by the pressure signal before the valve and automatically opens, and the No. 2 automatic regulating valve 10 is opened at the same time to transport the steam in the high-pressure cylinder 7 to the low-pressure cylinder 8, thereby reducing the pressure in the high-pressure cylinder 7. When the pressure in the high-pressure liquid cylinder 7 drops below a given value, the No. 1 automatic regulating valve 9 is automatically closed, and the high-pressure cylinder 7 stops transporting steam. In this process, the main function of the No. 1 automatic regulating valve 9 is to maintain the pressure stability of the original steam supply equipment. When the steam supplied in the heat storage spherical tank 2 is insufficient to meet the demand of the heat-using side, it needs to be short-term replenished through the high-pressure steam cylinder 7. That is, even when the pressure of the original steam supply equipment is lower than the given value, the No. 1 automatic regulating valve 9 will be automatically opened by the pressure signal after the valve, and the No. 2 automatic regulating valve 10 will be opened at the same time to transport the steam in the high-pressure cylinder 7 to the low-pressure cylinder 8, thereby ensuring the steam supply capacity of the low-pressure cylinder 8 and giving priority to meeting the demand of the heat-using side. In this process, the main function of the No. 1 automatic regulating valve 9 is to ensure the demand of the heat-using side.

[0026] Affected by the pressure in the heat storage spherical tank 2 and the pressure in the steam pipeline between the steam dryer 4 and the low-pressure sub-cylinder 8, the pressure on the inlet side of the No. 2 automatic regulating valve 10 varies greatly, and the pressure on the outlet side varies greatly with the change of the steam consumption on the heat-using side. Even if the pressure difference between the valve before and after the valve of the No. 2 automatic regulating valve 10 is large, the pressure in the low-pressure sub-cylinder 8 must be guaranteed to be constant. At this time, the main function of the No. 2 automatic regulating valve 10 is to maintain the pressure stability in the low-pressure sub-cylinder 8. When the heat-using side starts to use steam, when the pressure in the low-pressure sub-cylinder 8 drops to a given value, the No. 1 automatic regulating valve 9 and the No. 2 automatic regulating valve 10 are immediately opened to supply steam; the opening of the No. 2 automatic regulating valve 10 varies with the different gas consumption on the heat-using side. When the steam supply of the high-pressure sub-cylinder 7 is greater than the steam consumption on the heat-using side, the pressure before the No. 2 automatic regulating valve 10 rises, and the opening of the No. 2 automatic regulating valve 10 decreases at this time, and the opening of the No. 1 automatic regulating valve 9 is also affected by the increase in the pressure after the valve. When the steam consumption on the heat-using side is greater than the steam supply of the high-pressure steam sub-cylinder 7, the pressure in front of the No. 2 automatic regulating valve 10 decreases and its opening increases. At the same time, the pressure in the heat storage spherical tank 2 is greater than the pressure in front of the No. 2 automatic regulating valve 10. The No. 2 stop valve 13 at the steam outlet end of the heat storage spherical tank 2 opens, and the high-temperature and high-pressure saturated water in the heat storage spherical tank 2 flashes to generate steam, which supplies steam to the heat-using side, ensuring the gas consumption on the heat-using side and keeping the pressure in the low-pressure steam sub-cylinder 8 constant.

[0027] Reference Figure 3The schematic diagram of the structure of the automatic flow rate regulation of the present invention shows that when the flow rate is automatically regulated, the amount of steam delivered by the system to the heat-using side is kept at a constant value. At this time, the No. 1 automatic regulating valve 9 is an automatic pressure regulating valve, the No. 2 automatic regulating valve 10 is an automatic flow regulating valve, and a flow orifice 15 is arranged between the No. 2 automatic regulating valve 10 and the low-pressure steam cylinder 8. The system compares the pressure difference before and after the flow orifice 15 with a given value, and generates a pulse signal to control the opening of the No. 2 automatic regulating valve 10, so that the pressure difference before and after the flow orifice 15 is kept at a constant value, thereby ensuring quantitative steam supply to the heat-using side. When the steam supply directly from the high-pressure steam sub-cylinder 7 is balanced with the steam consumption on the heat-using side, the steam in the high-pressure steam sub-cylinder 7 directly enters the low-pressure steam sub-cylinder 8 through the No. 1 automatic regulating valve 9, the No. 2 automatic regulating valve 10 and the flow orifice 15 for use on the heat-using side; when the steam supply of the high-pressure steam sub-cylinder 7 is greater than the steam consumption on the heat-using side, the pressure difference before and after the flow orifice 15 becomes larger. At this time, the system controls the opening of the No. 2 automatic regulating valve 10 to decrease, so that the pressure difference before and after the flow orifice 15 remains unchanged to ensure a constant output steam volume. The opening of the No. 1 automatic regulating valve 9 is reduced due to the increase in pressure behind the valve. When the steam supply of the high-pressure steam cylinder 7 is less than the steam consumption on the heat-using side, the pressure difference before and after the flow orifice 15 becomes smaller. At this time, the system controls the opening of the No. 2 automatic regulating valve 10 to increase, and the pressure in the heat storage spherical tank 2 is greater than the pressure before the valve of the No. 2 automatic regulating valve 10. The No. 2 stop valve 13 at the steam outlet end of the heat storage spherical tank 2 is opened, and the high-temperature and high-pressure saturated water in the heat storage spherical tank 2 flashes to generate steam, which is supplied to the heat-using side, thereby ensuring that a certain amount of steam is provided to the heat-using side.

[0028] Furthermore, the outer surface of the heat storage spherical tank 2 is provided with a heat insulation layer made of a heat insulation material to prevent the heat of the high-temperature and high-pressure saturated water in the heat storage spherical tank 2 from being lost to the air; the heat insulation material can be selected with a density of 128Kg / m 3 High-strength hydrophobic aluminum silicate fiber blanket.

[0029] Furthermore, the circulating pump group 3 is arranged in a form of a combination of standby and use, mainly to prevent the system from maintaining normal operation when one of the pump bodies is damaged or undergoing maintenance. The circulating pipeline of the circulating pump group 3 and the heat storage spherical tank 2 extends into the heat storage spherical tank 2 for a part of its length, thereby preventing impurities at the bottom of the tank from being sucked into the circulating pump group 3 and causing damage to the circulating pump group 3. The end of the circulating pipeline extending into the heat storage spherical tank 2 is provided with a certain curvature, mainly to prevent impurities from falling directly into the circulating pipeline.

[0030] The electric heater 1 is an electric heating hot water boiler, an electric heating mold temperature controller for a reaction kettle, etc.

[0031] The working principle and workflow of the present invention are:

[0032] The external deoxygenated water supply device passes deoxygenated water into the electric heater 1 through the water supply pipe. The electric heater 1 uses the low-peak electricity at night to heat the low-temperature deoxygenated water for a long time to obtain high-temperature and high-pressure saturated water. The high-temperature and high-pressure saturated water enters the thermal storage spherical tank 2 through the saturated water pipeline for storage, and the temperature of the high-temperature and high-pressure saturated water in the thermal storage spherical tank 2 is monitored in real time. When the temperature of the high-temperature and high-pressure saturated water in the thermal storage spherical tank 2 drops to the set value, the saturated water in the thermal storage spherical tank 2 is passed into the electric heater 1 for reheating by starting the circulation pump group 3 to obtain high-temperature and high-pressure saturated water that meets the storage temperature;

[0033] When there is a demand for heat on the heat-using side, open the No. 1 automatic regulating valve 9 and the No. 2 automatic regulating valve 10, so that the high-pressure sub-cylinder 7 delivers steam to the low-pressure sub-cylinder 8, and steam is preferentially supplied to the heat-using side through the original steam supply equipment; when the steam supply capacity of the high-pressure sub-cylinder 7 cannot meet the demand on the heat-using side, open the No. 2 stop valve 13, at this time, the pressure in the steam pipe connected to the heat storage spherical tank 2 is reduced, and the pressure in the upper space of the heat storage spherical tank 2 is also reduced, and the high-temperature and high-pressure saturated water in the heat storage spherical tank 2 flashes in the upper space to produce steam, and the generated steam enters the steam dryer 4, where the water contained in the steam is dried and taken out, and the dried steam is transported to the low-pressure sub-cylinder 8 through the steam pipe. A liquid level gauge is also provided on the upper part of the heat storage spherical tank 2, which controls the water intake of the deoxygenated water feed water of the electric heater 1 by monitoring the water level in the heat storage spherical tank 2, thereby ensuring the stability of the liquid level in the heat storage spherical tank 2. In this embodiment, the working temperature of the heat storage spherical tank 2 is 128°C to 232°C, and the working pressure is 0.8 to 2.9 MPa; the pressure of the steam supplied by the heat storage spherical tank 2 is 0.75 MPa, and the temperature is 168°C.

[0034] Any matters not described in the present invention are applicable to the prior art.

Claims

1. An electric thermal energy storage steam supply system, comprising an electric heater, a heat storage spherical tank, a circulating pump group, a steam dryer and a steam cylinder; characterized in that: The water supply inlet at the upper part of the electric heater is connected to the external deoxygenated water supply device, the saturated water outlet at the upper end of the electric heater is connected to the saturated water inlet at the upper part of the thermal storage spherical tank, and the circulating water outlet at the lower end of the thermal storage spherical tank is connected to the recirculating water inlet at the lower end of the electric heater through a circulating pump group; the thermal storage spherical tank is not filled with high-temperature and high-pressure saturated water, leaving flash evaporation space; the steam outlet at the upper end of the thermal storage spherical tank is connected to the steam inlet of the steam dryer, and the steam outlet of the steam dryer is connected to the steam cylinder; The sub-cylinders include a high-pressure sub-cylinder and a low-pressure sub-cylinder; the steam inlet of the high-pressure sub-cylinder is connected to the original steam supply equipment, the steam outlet of the high-pressure sub-cylinder is connected to the steam inlet of the low-pressure sub-cylinder, the steam inlet of the low-pressure sub-cylinder is also connected to the steam outlet of the steam dryer, and the steam outlet of the low-pressure sub-cylinder is connected to the hot side; the steam outlet end of the high-pressure sub-cylinder is provided with a No. 1 automatic regulating valve, and the steam inlet end of the low-pressure sub-cylinder is provided with a No. 2 automatic regulating valve; The system has the function of automatically adjusting pressure and flow. When the pressure is automatically adjusted, the No. 1 automatic regulating valve is controlled by the pressure signals before and after the valve, and the No. 2 automatic regulating valve plays a role in reducing pressure. When the pressure in the high-pressure sub-cylinder rises to a given value, the No. 1 automatic regulating valve is automatically opened by the pressure signal before the valve, and the No. 2 automatic regulating valve is opened at the same time to transport the steam in the high-pressure sub-cylinder to the low-pressure sub-cylinder, thereby reducing the pressure in the high-pressure sub-cylinder. When the pressure in the high-pressure sub-cylinder drops below the given value, the No. 1 automatic regulating valve is automatically closed, and the high-pressure sub-cylinder stops transporting steam. In this process, the role of the No. 1 automatic regulating valve is to maintain the pressure stability of the original steam supply equipment. When the steam supplied in the heat storage spherical tank is insufficient to meet the demand on the heat-using side, when the pressure of the original steam supply equipment is lower than the given value, the No. 1 automatic regulating valve is automatically opened by the pressure signal after the valve, and the No. 2 automatic regulating valve is opened at the same time to transport the steam in the high-pressure sub-cylinder to the low-pressure sub-cylinder, thereby ensuring the steam supply capacity of the low-pressure sub-cylinder. In this process, the role of the No. 1 automatic regulating valve is to ensure the demand on the heat-using side. When the heat-using side starts to use steam, when the pressure in the low-pressure steam cylinder drops to a given value, the No. 1 automatic regulating valve and the No. 2 automatic regulating valve are immediately opened to supply steam; when the steam supply of the high-pressure steam cylinder is greater than the steam consumption on the heat-using side, the pressure in front of the No. 2 automatic regulating valve rises, at which time the opening of the No. 2 automatic regulating valve decreases, and the opening of the No. 1 automatic regulating valve is also affected by the increase in the pressure behind the valve, and the opening of the No. 2 automatic regulating valve decreases accordingly; when the steam consumption on the heat-using side is greater than the steam supply of the high-pressure steam cylinder, the pressure in front of the No. 2 automatic regulating valve decreases, and the opening of the No. 2 automatic regulating valve increases. At the same time, the high-temperature and high-pressure saturated water in the heat storage spherical tank flashes to generate steam, which supplies steam to the heat-using side to ensure that the pressure in the low-pressure steam cylinder is constant; When the flow rate is automatically adjusted, the amount of steam delivered by the system to the heat-using side remains constant. At this time, the No. 1 automatic regulating valve is an automatic pressure regulating valve, the No. 2 automatic regulating valve is an automatic flow regulating valve, and a flow orifice is provided between the No. 2 automatic regulating valve and the low-pressure steam sub-cylinder. The system compares the pressure difference before and after the flow orifice with a given value, and generates a pulse signal to control the opening of the No. 2 automatic regulating valve. When the steam supply directly from the high-pressure steam sub-cylinder is balanced with the steam consumption on the heat-using side, the steam in the high-pressure steam sub-cylinder enters directly through the No. 1 automatic regulating valve, the No. 2 automatic regulating valve and the flow orifice. into the low-pressure steam cylinder; when the steam supply of the high-pressure steam cylinder is greater than the steam consumption on the heat-using side, the pressure difference before and after the flow orifice plate becomes larger, at this time the system controls the opening of the No. 2 automatic regulating valve to decrease, so that the pressure difference before and after the flow orifice plate remains unchanged, and the opening of the No. 1 automatic regulating valve is reduced due to the increase in pressure after the valve; when the steam supply of the high-pressure steam cylinder is less than the steam consumption on the heat-using side, the pressure difference before and after the flow orifice plate becomes smaller, at this time the system controls the opening of the No. 2 automatic regulating valve to increase, and the high-temperature and high-pressure saturated water in the heat storage spherical tank flashes to generate steam to supply steam to the heat-using side.

2. The electric thermal energy storage steam supply system according to claim 1, characterized in that: The connecting pipe between the saturated water outlet of the electric heater and the saturated water inlet of the heat storage spherical tank extends into the heat storage spherical tank for a distance, and a ring-shaped or diamond-shaped bending part is provided at the end of the pipe, and the bending part is covered with water outlet holes.

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