Electric heating assisted high-voltage energy storage system and control method thereof

Abstract

The invention discloses an electric heating assisted high-voltage energy storage system and a control method thereof, and belongs to the technical field of energy storage. The system comprises an energy storage tank filled with an aqueous solution, an electric heater and a steam pipeline, the energy storage tank is connected with the output end of the steam pipeline, and the output end of the steam pipeline is connected with the bubbler and arranged in the energy storage tank. The bubbler is positioned below the liquid level of the aqueous solution; steam enters the energy storage tank through a bubbler at the output end of the steam pipeline to pressurize and heat the water solution; an electric heater is arranged in the energy storage tank and used for pressurizing and heating the water solution in the energy storage tank. The electric heater is arranged in the energy storage tank, the generated steam pressure can be increased, a large amount of steam is provided when the unit load is large, and the situation that the unit steam is insufficient or parameters cannot meet the requirements is avoided.

Description

Technical Field

[0001] The present invention belongs to the technical field of energy storage, and particularly relates to a high-voltage energy storage system assisted by electric heating and a control method thereof. Background Art

[0002] At present, the working pressure of some small boilers is limited. For higher steam pressure requirements, small boilers cannot generate steam with sufficient pressure to meet specific needs. At the same time, the power of small boilers is limited and they cannot generate steam with sufficient flow rate in a short time. For large-flow steam requirements, small boilers also cannot meet them.

[0003] At the same time, the cost of modifying or replacing boilers is high and the time cycle is long, resulting in a greater impact. Therefore, a new method is needed to generate large-flow and high-pressure steam in a short time and improve the steam production capacity of boilers in a low-cost manner. Summary of the Invention

[0004] The purpose of the present invention is to provide a high-voltage energy storage system for pressurizing water to vaporize and generate steam, which can provide a large amount of steam in a short time for convenient application.

[0005] The present invention provides an electric heating-assisted high-voltage energy storage system, which includes an energy storage tank filled with an aqueous solution inside, an electric heater, and a steam pipeline; the energy storage tank is connected to the output end of the steam pipeline, and the tail end of the output end of the steam pipeline is connected to a bubbler arranged inside the energy storage tank; the bubbler is located below the liquid level of the aqueous solution; steam enters the inside of the energy storage tank through the bubbler at the output end of the steam pipeline to pressurize and heat the aqueous solution; an electric heater is arranged inside the energy storage tank for pressurizing and heating the aqueous solution inside the energy storage tank; the energy storage tank completes the energy storage work inside through the combined action of steam heat exchange through the steam pipeline and pressurizing and heating by the electric heater.

[0006] Further, the top of the energy storage tank is connected to an exhaust pipeline, and a pressure reducing valve is arranged on the exhaust pipeline; the pressure reducing valve is used to decompress and vaporize the high-pressure aqueous solution stored inside the energy storage tank to form steam, and the steam is discharged along the exhaust pipeline.

[0007] Further, a drain pipeline is arranged at the bottom of the energy storage tank, and a drain valve is arranged on the drain pipeline; when the drain valve is opened, the aqueous solution inside the energy storage tank is released.

[0008] Further, the energy storage tank is connected to the output end of a water supply pipeline, and a water supply pump and a water supply valve are arranged in sequence from the input end to the output end of the water supply pipeline; when the content of the aqueous solution inside the water storage tank is insufficient, the water supply pump is turned on, and the water supply pipeline supplies water to the water storage tank.

[0009] Further, a first pressure sensor and a first temperature sensor are arranged on the surface of the energy storage tank for real-time monitoring of the temperature and pressure inside the energy storage tank.

[0010] Further, a steam regulating valve, a second temperature sensor, and a second pressure sensor are sequentially installed from the input end to the output end of the steam pipeline.

[0011] The present invention also provides a control method for an electric heating-assisted high-pressure energy storage system, including:

[0012] (1) Preparation stage: Open the water supply valve, start the water supply pump, and inject water into the energy storage tank through the water supply pipeline. The water level needs to be higher than the bubbler.

[0013] (2) Gas storage stage: Open the steam regulating valve, and steam is introduced into the energy storage tank through the steam pipeline. The steam exchanges heat with the water in the energy storage tank through the bubbler, cools and condenses into water, and the water in the energy storage tank heats up and increases in pressure.

[0014] (3) Pressure boosting stage: Close the steam regulating valve, start the electric heater, heat the saturated water in the energy storage tank, the saturated water heats up and increases in pressure, and the pressure and temperature in the energy storage tank can be measured by the first pressure sensor and the first temperature sensor.

[0015] (4) Release stage: Open the pressure reducing valve, and the high-temperature and high-pressure hot water inside the energy storage tank becomes saturated steam through the pressure reducing valve and is released through the exhaust pipeline.

[0016] (5) Drainage stage: Open the drain valve, and the aqueous solution inside the energy storage tank is discharged through the drain pipeline.

[0017] The beneficial effects of the present invention are as follows:

[0018] The present invention provides an electric heating-assisted high-pressure energy storage system, which stores excess steam by bubbling into water. A method for solving the problem of insufficient boiler pressure is provided. By combining bubbling energy storage and electric heater heating, the pressure can be increased to meet the steam pressure requirements in industry or scientific research, and the cost and limitations of boiler replacement are avoided. A method of energy storage is provided, which can store the excess steam of the power plant unit. At the same time, the situation where the steam cannot be sent back to the original unit due to insufficient pressure can be avoided. By increasing the pressure through the electric heater, the pressure of the released steam can be increased. When the unit load is large, a large amount of steam can be provided to avoid insufficient steam or unqualified parameters of the unit. The system of the present invention saves space, is simple to operate, saves costs, can store energy to the maximum extent, and provides steam for the subsequent operation of the unit. Description of the Drawings

[0019] Figure 1 It is a schematic diagram of an electric heating-assisted high-pressure energy storage system.

[0020] The reference numerals are: energy storage tank 1, steam pipeline 2, water supply pipeline 3, electric heater 4, exhaust pipeline 5, drain pipeline 6, first pressure sensor 11, first temperature sensor 12, steam regulating valve 21, second pressure sensor 22, bubbler 23, second temperature sensor 24, water supply pump 31, water supply valve 32, wire 41, pressure reducing valve 51, drain valve 61. Detailed implementation manners

[0021] The present invention will be further described below with reference to the accompanying drawings.

[0022] The present invention discloses an electrically heated assisted high-pressure energy storage system, as Figure 1 shown, comprising: an energy storage tank 1, a steam pipeline 2, a water supply pipeline 3, an electric heater 4, an exhaust pipeline 5, a drain pipeline 6; interfaces of the steam pipeline 2, the water supply pipeline 3, the electric heater 4, the exhaust pipeline 5, and the drain pipeline 6 for connecting with the above pipelines; the boiler is connected to the energy storage tank 1 through the steam pipeline 2, a bubbler 23 is provided at the end of the steam pipeline 2, a steam regulating valve 21 is provided on the steam pipeline 2, and a second pressure sensor 22 and a second temperature sensor 24 are also provided on the steam pipeline; the water supply pipeline 3 is connected to the energy storage tank 1, and a water supply pump 31 and a water supply valve 32 are provided on the water supply pipeline 3; the exhaust pipeline 5 is located on the energy storage tank 1, and a pressure reducing valve 51 is provided on the exhaust pipeline 1; the drain pipeline 6 is located at the bottom of the energy storage tank 1, and a drain valve 61 is provided on the drain pipeline 6; the electric heater 4 is arranged inside the energy storage tank 1, and the electric heater 4 is connected to the power supply through a wire for heating and pressurizing the water inside the energy storage tank.

[0023] Embodiment 1

[0024] An electrically heated assisted high-pressure energy storage system comprises an energy storage tank 1, a steam pipeline 2, a water supply pipeline 3, an electric heater 4, an exhaust pipeline 5, and a drain pipeline 6; the steam pipeline 2 is connected to the energy storage tank 2, and a bubbler 23 is provided at the end of the steam pipeline 2. After the boiler generates steam, the steam is introduced into the energy storage tank 1 through the steam pipeline 2. The bubbler 23 is located below the water level inside the energy storage tank 1 for introducing steam into the water. The steam regulating valve 21 controls the steam flow through different opening degrees, and the second pressure sensor 22 and the second temperature sensor 24 are used to reflect the steam parameters. The water supply pipeline 3 is connected to the energy storage tank 1, and a water supply pump 31 and a water supply valve 32 are provided on the water supply pipeline 3; by opening the water supply valve 32, the water supply pump 31 introduces the water in the water tank into the energy storage tank 1. An electric heater 4 is provided in the energy storage tank 1, and the electric heater 4 is connected to the power supply through a wire; the electric heater 4 is used to heat the water in the energy storage tank 1 to increase the temperature and pressure of the water. An exhaust pipeline 5 is provided on the energy storage tank 1, and a pressure reducing valve 51 is provided on the exhaust pipeline 5; by opening the pressure reducing valve 51, the high-pressure water stored in the energy storage tank 1 is decompressed and vaporized to form steam and then discharged. A drain pipeline 6 is provided at the bottom of the energy storage tank 1, and a drain valve 61 is provided on the drain pipeline 6; by opening the drain valve 61, the water in the energy storage tank 1 can be released.

[0025] A control method for an electric heating-assisted high-voltage energy storage system, comprising:

[0026] In the preparation stage, open the water supply valve 32, start the water supply pump 31, and inject water into the energy storage tank 1 through the water supply pipeline 3. The water level needs to be higher than the bubbler 23.

[0027] In the steam storage stage, open the steam regulating valve 21, and introduce steam into the energy storage tank 1 through the steam pipeline 2. The steam fully exchanges heat with the water in the energy storage tank 1 through the bubbler 23, cools and condenses into water, and the water in the energy storage tank 1 heats up and increases in pressure.

[0028] In the pressure boosting stage, close the steam regulating valve 21, start the electric heater 4, heat the saturated water in the energy storage tank 1, the saturated water heats up and increases in pressure, and the parameters in the energy storage tank 1 can be measured by the temperature and pressure measuring points 11 of the energy storage tank.

[0029] In the release stage, open the pressure reducing valve 51, the water in the energy storage tank 1 cools down and reduces in pressure, becomes saturated steam, and is released through the exhaust pipeline 5.

[0030] In the draining stage, open the drain valve 61, and the remaining water in the energy storage tank 1 is discharged through the drain pipeline 6.

[0031] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A high-voltage energy storage system assisted by electric heating, characterized in that, It includes an energy storage tank (1) filled with an aqueous solution inside, an electric heater (4), and a steam pipeline (2); The energy storage tank (1) is connected to the output end of the steam pipeline (2), and the tail end of the output end of the steam pipeline (2) is connected to a bubbler (23) disposed inside the energy storage tank (1); the bubbler (23) is located below the liquid level of the aqueous solution; steam enters the inside of the energy storage tank (1) through the bubbler (23) at the output end of the steam pipeline, pressurizing and heating the aqueous solution; an electric heater (4) is provided inside the energy storage tank (1) for pressurizing and heating the aqueous solution inside the energy storage tank (1); the energy storage tank (1) completes the energy storage work inside through the combined action of steam heat exchange transported through the steam pipeline (2) and pressurizing and heating by the electric heater (4).

2. The high-voltage energy storage system assisted by electric heating according to claim 1, wherein The top of the energy storage tank (1) is connected to an exhaust pipeline, and a pressure reducing valve (51) is arranged on the exhaust pipeline; the pressure reducing valve is used to decompress and vaporize the high-temperature and high-pressure aqueous solution stored inside the energy storage tank (1) to form steam, and the steam is discharged along the exhaust pipeline.

3. The high-voltage energy storage system assisted by electric heating according to claim 1, wherein A drain pipeline (6) is provided at the bottom of the energy storage tank (1), and a drain valve (61) is arranged on the drain pipeline; when the drain valve (61) is opened, the aqueous solution inside the energy storage tank (1) is released.

4. The high-voltage energy storage system assisted by electric heating according to claim 1, wherein The energy storage tank (1) is connected to the output end of a water supply pipeline (3), and a water supply pump (31) and a water supply valve (32) are arranged in sequence from the input end to the output end of the water supply pipeline (3); when the content of the aqueous solution inside the water storage tank (1) is insufficient, the water supply pump (31) is turned on, and the water supply pipeline (3) supplies water to the water storage tank (1).

5. The high-voltage energy storage system assisted by electric heating according to claim 1, wherein A first pressure sensor (11) and a first temperature sensor (12) are arranged on the surface of the energy storage tank (1) for real-time monitoring of the temperature and pressure inside the energy storage tank (1).

6. The high-voltage energy storage system assisted by electric heating according to claim 1, wherein A steam regulating valve (21), a second temperature sensor (24), and a second pressure sensor (22) are installed in sequence from the input end to the output end of the steam pipeline (2).

7. A control method for a high-voltage energy storage system assisted by electric heating as described in any one of claims 1 to 6, characterized in that, It includes: (1) Preparation stage; Open the water supply valve (32), start the water supply pump (31), and inject water into the energy storage tank (1) through the water supply pipeline (3), and the water level needs to be higher than the bubbler (23); (2) Gas storage stage; Open the steam regulating valve (21), and steam is introduced into the energy storage tank (1) through the steam pipeline (2). The steam fully exchanges heat with the water in the energy storage tank (1) through the bubbler (23), cools and condenses into water, and the water in the energy storage tank (1) heats up and the pressure increases; (3) Pressure boosting stage; Close the steam regulating valve (21), start the electric heater (4) to heat the saturated water in the energy storage tank (1), the saturated water heats up and the pressure increases, and the pressure and temperature in the energy storage tank (1) can be measured by the first pressure sensor (11) and the first temperature sensor (12); (4) Release stage; Open the pressure reducing valve (51), and the high-temperature and high-pressure hot water inside the energy storage tank (1) becomes saturated steam through the pressure reducing valve (51) and is released through the exhaust pipeline (5); (5) Drainage stage; Open the drain valve (61), and the aqueous solution inside the energy storage tank (1) is discharged through the drain pipeline (6).

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