Array type high-pressure saturated water storage equipment and control method thereof

Abstract

The invention discloses array type high-pressure saturated water storage equipment and a control method thereof, and belongs to the technical field of energy storage. The equipment comprises a plurality of water storage tanks, wherein the inner side surfaces of the water storage tanks are attached and distributed in an array manner; the plurality of water storage tanks are respectively connected with a water supply pipeline, a steam supply pipeline, a steam exhaust pipeline and a drain pipeline through branch pipelines. According to the equipment, when the load is underestimated, steam of the boiler can be converted into high-temperature saturated water to be stored in the water storage tank; and at the load peak, the high-temperature saturated water in the water storage tank is converted into steam to provide energy for the unit. According to the array type high-pressure liquid storage equipment provided by the invention, huge high-pressure liquid storage equipment can be reduced, and the manufacturing cost of a storage system is reduced. And the equipment is divided into a plurality of small-size water storage tanks, so that the water storage space can be flexibly adjusted according to the requirement of water storage capacity, and the equipment is convenient to maintain.

Description

Technical Field

[0001] The present invention belongs to the technical field of energy storage, and particularly relates to an array-type high-pressure saturated water storage device and a control method thereof. Background Art

[0002] At present, the power grid still mainly relies on thermal power, but the load of the power grid fluctuates continuously. Therefore, it is necessary to continuously adjust the output power of the power plant to cope with the load fluctuations. Energy storage technology is a way to cope with load fluctuations. Among them, high-pressure saturated water has a very high enthalpy value. Thermal power plants can achieve energy storage by storing high-pressure saturated water, that is, storing high-pressure water during low load periods and releasing high-pressure saturated water during peak load periods.

[0003] Peak shaving of the thermal power system can be achieved through saturated water energy storage. When steam is needed, steam is formed by reducing the pressure and vaporizing the steam, which is supplied to the steam turbine to do work. In order to have a strong peak shaving ability, a large amount of saturated water needs to be stored. Therefore, in order to achieve energy storage by storing high-pressure saturated water, it is necessary to manufacture a large-sized water storage device with high pressure resistance.

[0004] The manufacture of large-sized equipment with high pressure resistance is difficult and costly, and the equipment needs to be monitored during operation. When the equipment is damaged, the entire equipment is forced to stop for maintenance, reducing the peak shaving ability of the thermal power plant. When the amount of saturated water to be stored becomes small, a larger equipment is not needed for storage, resulting in waste of equipment space. Summary of the Invention

[0005] The purpose of the present invention is to provide an array-type high-pressure saturated water storage device, which is used for high-pressure water and vaporizes to generate steam, and can provide a large amount of steam in a short time, which is convenient for application.

[0006] The present invention provides an array-type high-pressure saturated water storage device, which is characterized in that it includes a plurality of water storage tanks, a water supply pipeline, and a steam supply pipeline; the inner sides of the plurality of water storage tanks are arranged in an array; each branch output end of the water supply pipeline is connected to the water storage tank; a water supply pump is provided on the main return path of the water supply pipeline, and a water supply valve is provided on the branch return path of the water supply pipeline; the water storage tank is connected to each branch output end of the steam supply pipeline, and the tail end of the output end of the steam supply pipeline is connected to a bubbler arranged inside the water storage tank; the bubbler is located below the liquid level of the aqueous solution in the water storage tank; steam enters the inside of the water storage tank through the bubbler at the output end of the steam supply pipeline, pressurizing and heating the aqueous solution.

[0007] Furthermore, it further includes an exhaust pipeline; each branch input end of the exhaust pipeline is connected to the water storage tank, and a pressure reducing valve is provided on each branch return path of the exhaust pipeline; when the water in the water storage tank is in a high-temperature and high-pressure state, the pressure reducing valve is opened, and steam is formed by reducing the pressure and vaporizing, and the steam is discharged along the exhaust pipeline.

[0008] Furthermore, a pressure safety valve is provided at the top of the water storage tank for detecting the pressure inside the water storage tank. When the water storage tank is overpressured, the pressure inside the water storage tank is discharged to the atmosphere.

[0009] Furthermore, a drain pipeline is also included; a through groove is opened at the bottom of the water storage tank and connected to the input ends of each branch of the drain pipeline; a drain pump is provided on the main return path of the drain pipeline, and drain valves are provided on each branch return path of the drain pipeline; the drain pipeline is used to discharge the water inside the water storage tank.

[0010] The present invention also provides a control method for an array type high-pressure saturated water storage device, including:

[0011] (1) Preparation stage: Open the water supply valve, start the water supply pump, and inject water into the water storage tank through the water supply pipeline until the water level is higher than the bubbler.

[0012] (2) Energy storage stage: Open the steam supply regulating valve of a single branch, and introduce steam into the corresponding water storage tank through the steam supply pipeline. The steam exchanges heat fully with the water in the water storage tank through the bubbler, cools and condenses into water, and the water in the water storage tank heats up and increases in pressure; when the pressure safety valve detects that the pressure in the water storage tank reaches the set pressure, close the steam supply regulating valve on the corresponding branch; if there is still remaining steam to be stored, open the steam supply regulating valves of other branches, and the corresponding water storage tanks store the steam until all the steam is stored.

[0013] (3) Energy release stage: Open the pressure reducing valve, and the high-temperature saturated water in the water storage tank is depressurized and vaporized into steam, which is sent back to the original unit along the exhaust pipeline for energy release.

[0014] (4) Drainage stage: Open the drain valve, start the drain pump, and the remaining water in the water storage tank is discharged through the drain pipeline.

[0015] The beneficial effects of the present invention are as follows:

[0016] It provides a storage method for the excess steam generated when the power plant reduces load, avoiding frequent power adjustment of the boiler of the unit and wasting of excess steam at the same time; using high-temperature saturated water for energy storage increases the energy storage capacity. The density of saturated water is much greater than that of steam, and the energy storage can be increased by storing saturated water; using an array type water storage can reduce the manufacturing cost of pressure vessels and reduce the manufacturing scale of a single vessel; using small containers to store water can select the number of containers according to the storage capacity, avoiding the situation that the pressure of a large container cannot reach the target pressure. Description of the Drawings

[0017] Figure 1 It is the front view of an array type high-pressure saturated water storage device of the present invention;

[0018] Figure 2Schematic diagram of the water storage process of an array - type high - pressure saturated water storage device of the present invention;

[0019] Figure 3 Schematic diagram of the steam exhaust process of an array - type high - pressure saturated water storage device of the present invention.

[0020] The reference numerals are: water storage tank 1, water supply pipeline 2, steam exhaust pipeline 3, steam supply pipeline 4, drain pipeline 5, pressure safety valve 11, water supply pump 21, water supply valve 22, pressure reducing valve 31, bubbler 41, steam supply regulating valve 42, drain pump 51, drain valve 52. Detailed implementation manners

[0021] To make the objectives, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are some but not all of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts belong to the scope of protection of the present invention. The present invention will be further described below with reference to the drawings.

[0022] Embodiment 1

[0023] An array - type high - pressure saturated water storage device, as Figure 1 shown, includes: a plurality of water storage tanks 1, a water supply pipeline 2, a steam exhaust pipeline 3, a steam supply pipeline 4, and a drain pipeline 5. The water supply pipeline 2 is connected to each water storage tank 1 through a branch pipe. A water supply pump 21 is provided on the main pipeline of the water supply pipeline 2, and a water supply valve 22 is provided on the branch pipeline. When supplying water, the water supply valve 22 is opened, and water is supplied to the water storage tank 1 through the water supply pump 21. When supplying water, the number of water storage tanks used can be selected according to the water output to achieve water storage under different volumes. Each branch pipeline of the steam supply pipeline 4 extends into the interior of the water storage tank 1, and a bubbler 41 is provided at the end of the steam supply pipeline 4. When the boiler generates too much steam, the steam can be sent into the water storage tank through the steam supply pipeline. The bubbler is located below the liquid level and is used to introduce steam into the water. The steam exhaust pipeline 3 is connected to the top of each water storage tank 1 through a branch pipe, and a pressure reducing valve 31 is provided on the branch pipe at the top of each water storage tank 1. When the power plant needs steam, the pressure reducing valves 31 on each branch are opened, and the saturated water is decompressed and introduced into the steam exhaust pipeline 3. A pressure safety valve 11 is provided above the water storage tank 1. When the water storage tank 1 is over - pressured, steam is discharged outward to reduce the pressure in the tank. The drain pipeline 5 is connected to the bottom of each water storage tank 1 through a branch pipe. A drain pump is provided on the main pipeline of the drain pipeline 5, and a drain valve is provided on each branch pipeline. When saturated water is needed, the drain valve at the bottom is opened, and the saturated water in the water tank is discharged through the water delivery pipeline.

[0024] A control method for an array - type high - pressure saturated water storage device, including:

[0025] (1) Preparation stage: Open the water supply valve 22, start the water supply pump 21, and inject water into the storage tank 1 through each branch of the water supply pipeline 2. The water level should be higher than the bubbler 41.

[0026] (2) Energy storage stage: Open the steam supply regulating valve 42 on a single branch, and introduce steam into the corresponding single storage tank 1 through the steam supply pipeline 4. The steam exchanges heat fully with the water in the storage tank 1 through the bubbler 41, cools and condenses into water, and the water in the storage tank 1 heats up and increases in pressure. When the temperature and pressure in a single storage tank 1 reach the set temperature and pressure of the storage tank 1, close the steam supply regulating valve 42 on the corresponding branch. If there is still remaining steam to be stored, select another unused storage tank 1 and repeat the above process until all the steam is stored.

[0027] (3) Energy release stage, as Figure 3 shown, open the pressure reducing valve 51, and the high-temperature saturated water in the storage tank 1 is depressurized and vaporized into steam, which is sent back to the original unit along the exhaust pipeline 31 for energy release.

[0028] (4) Drainage stage: Open the drain valve 52 and start the drain pump 51. The remaining water in the storage tank 1 is discharged through the drain pipeline 5.

[0029] 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. An array-type high-pressure saturated water storage device, characterized in that, It includes several water storage tanks (1), a water supply pipeline (2), and a steam supply pipeline (4); The inner sides of several of the water storage tanks (1) are attached and arranged in an array; each branch output end of the water supply pipeline (2) is connected to the water storage tank (1); a water supply pump (21) is provided on the main return line of the water supply pipeline, and a water supply valve is provided on the branch return line of the water supply pipeline; the water storage tank (1) is connected to each branch output end of the steam supply pipeline (4), and the tail end of the output end of the steam supply pipeline (4) is connected to a bubbler (41) arranged inside the water storage tank (1); the bubbler (41) is located below the liquid level of the aqueous solution in the water storage tank (1); steam enters the inside of the water storage tank (1) through the bubbler (23) at the output end of the steam supply pipeline (4) to pressurize and heat the aqueous solution.

2. The array-type high-pressure saturated water storage device according to claim 1, characterized in that, It further includes an exhaust pipeline (3); each branch input end of the exhaust pipeline (3) is connected to the water storage tank (1), and a pressure reducing valve is provided on each branch return line of the exhaust pipeline (3); when the water in the water storage tank (1) is in a high-temperature and high-pressure state, the pressure reducing valve is opened, and the water is vaporized under reduced pressure to form steam, which is discharged along the exhaust pipeline (3).

3. The array-type high-pressure saturated water storage device according to claim 2, wherein A pressure safety valve is provided at the top of the water storage tank (1) for detecting the pressure inside the water storage tank; when the water storage tank (1) is over-pressurized, the pressure inside the water storage tank (1) is discharged to the atmosphere.

4. The array-type high-pressure saturated water storage device according to claim 1, wherein, It further includes a drain pipeline; a through groove is opened at the bottom of the water storage tank (1) and is connected to each branch input end of the drain pipeline (5); a drain pump (51) is provided on the main return line of the drain pipeline (5), and a drain valve is provided on each branch return line of the drain pipeline (5); the drain pipeline (5) is used to discharge the water inside the water storage tank (1).

5. A control method for the array-type high-pressure saturated water storage device according to claim 1, characterized in that It includes: (1) Preparation stage: Open the water supply valve (22), start the water supply pump (21), and inject water into the water storage tank (1) through the water supply pipeline (2) until the water level is higher than the bubbler (41); (2) Energy storage stage: Open the steam supply control valve of a single branch, and introduce steam into the corresponding water storage tank (1) through the steam supply pipeline (4). The steam exchanges heat fully with the water in the water storage tank (1) through the bubbler (41) and condenses into water upon cooling. The water in the water storage tank (1) increases in temperature and pressure; when the pressure safety valve detects that the pressure in the water storage tank (1) reaches the set pressure, close the steam supply control valve on the corresponding branch; if there is still remaining steam to be stored, open the steam supply control valves of other branches, and the corresponding water storage tanks (1) store the steam until all the steam is stored; (3) Energy release stage: Open the pressure reducing valve, and the high-temperature saturated water in the water storage tank (1) is vaporized under reduced pressure into steam, which is sent back to the original unit along the exhaust pipeline (31) for energy release; (4) Drainage stage: Open the drain valve, start the drain pump (51), and the remaining water in the water storage tank (1) is discharged through the drain pipeline (5).

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