Enhanced deoxidizing system for water heat storage system of pressure storage power station and operation method

Abstract

The invention discloses an enhanced deoxidizing system for a water heat storage system of a compressed gas energy storage power station, and relates to the technical field of water heat storage systems of compressed gas energy storage power stations. The device comprises a high-temperature tank, a low-temperature tank, an intensified turbulent flow system and an intensified circulating system, the enhanced turbulent flow system is arranged in the high-temperature tank and the low-temperature tank; one end of the supercharger air inlet pipeline is connected with the communicating pipe, and the other end is connected with a supercharger inlet; and one end of the supercharger exhaust pipeline is connected with the supercharger outlet, the other end of the supercharger exhaust pipeline is divided into two paths, one path is connected with the enhanced turbulent flow system in the high-temperature tank, and the other path is connected with the enhanced turbulent flow system in the low-temperature tank. Compared with the scheme that the deoxidizing effect is guaranteed by only increasing the dosage in the prior art, the consumption of the deoxidizing agent of the power station can be effectively reduced, the operating cost of the power station is reduced, and the operating economy of the power station is improved. The invention further relates to an operation method of the enhanced deoxidizing system for the water heat storage system of the pressure storage power station.

Description

Technical Field

[0001] The present invention relates to the technical field of water thermal energy storage systems for compressed gas energy storage power stations. More specifically, it is a strengthened deaeration system for the water thermal energy storage system of a compressed gas storage power station. The present invention also relates to an operation method of such a strengthened deaeration system for the water thermal energy storage system of a compressed gas storage power station. Background Art

[0002] Compressed gas energy storage systems include different gas energy storage systems such as compressed air energy storage and compressed CO2 energy storage. They are currently recognized as large-capacity and long-duration energy storage technologies comparable to pumped-storage energy storage. In recent years, they have been widely studied in China, and the construction of multiple demonstration projects has been carried out. Currently, the largest single-unit capacity of the compressed gas energy storage power station that has been officially grid-connected is up to 300 MW.

[0003] The compressed gas energy storage system includes a compression energy storage system, an expansion power generation system, a heat exchange system, a thermal energy storage system, and a gas storage tank system. The compressed gas energy storage system can be divided into three technical routes: low-temperature adiabatic compression, medium-temperature adiabatic compression, and high-temperature adiabatic compression according to the characteristics of the thermal energy storage system. Different technical routes have different characteristics. The applicant applied for "Compressed Air Energy Storage System Using High-Pressure High-Temperature Hot Water Thermal Energy Storage and Its Operation Method" (Application No.: 202111577916.X) on December 22, 2021. A medium-temperature adiabatic compressed air energy storage system using pressurized water thermal energy storage was proposed in this patent application, providing a brand-new technical route for the field of compressed air energy storage. Currently, this technical solution has been applied in a 300 MW-class compressed air energy storage power station demonstration project and multiple other under-construction projects.

[0004] The heat storage medium of the compressed air energy storage system using pressurized water thermal energy storage is hot medium water, which generally uses demineralized water or softened water. The thermal energy storage system is configured with a nitrogen constant pressure system to maintain the pressure stability in the storage tank. Considering the good water quality conditions of the hot medium water, in conventional compressed air energy storage projects, equipment and pipelines such as the thermal energy storage system and the heat exchange system in contact with the hot medium water all use carbon steel. To reduce the corrosion effect of dissolved oxygen in the hot medium water on carbon steel, the thermal energy storage system is configured with a chemical dosing deaeration system according to the conventional practice of thermal power plants. Chemical agents such as hydrazine, carbohydrazide, and acetone oxime are used to reduce the dissolved oxygen concentration in the hot medium water through the reaction of the chemical agent with dissolved oxygen. However, different from the water system of a conventional thermal power plant that is always in a circulating state, the water thermal energy storage system of a compressed gas energy storage power station only operates one cycle in each energy storage / discharge cycle, and the hot medium water is in a static state in the storage tank for a long time, that is:

[0005] 1) During the compression energy storage stage, the hot medium water is heated by the compression side heat exchanger from the low-temperature tank and then circulated to the high-temperature tank for storage.

[0006] 2) After the compression energy storage stage ends, the high-temperature hot medium water is stored statically in the high-temperature tank.

[0007] 3) During the expansion power generation stage, the hot medium water is cooled by the expansion side heat exchanger from the high-temperature tank and then circulates back to the low-temperature tank for storage;

[0008] 4) After the expansion power generation stage ends, the low-temperature hot medium water is stored in the low-temperature tank;

[0009] 5) Enter the next energy storage / discharge cycle.

[0010] The above operating characteristics will inevitably affect the deaeration reaction efficiency of the dosing system. Therefore, to achieve the same deaeration effect, the water thermal energy storage system of the compressed air energy storage power station needs to add more deaeration agents, which undoubtedly brings a certain pressure to the operating cost of the power station; in addition, even if more deaeration agents are added, due to the fact that the hot medium water system of the compressed air energy storage power station is in a static state for a long time, the actual operating effect of the dosing deaeration system is greatly reduced.

[0011] Therefore, it is of good economic benefit to develop an enhanced deaeration system and its operation method for the water thermal energy storage system of a compressed air energy storage power station, which can effectively reduce the dosage of deaeration agents in the thermal energy storage system, reduce the operating cost of the power station, and at the same time effectively improve the deaeration reaction efficiency during the static stage of the hot medium water through enhanced deaeration measures to ensure the safe and stable operation of the equipment and pipelines in the thermal energy storage system and the heat exchange system. Summary of the Invention

[0012] The first object of the present invention is to overcome the deficiencies of the above background technology and provide an enhanced deaeration system for the water thermal energy storage system of a compressed air energy storage power station.

[0013] The second object of the present invention is to provide an operation method for the enhanced deaeration system for the water thermal energy storage system of a compressed air energy storage power station.

[0014] To achieve the above first object, the technical solution of the present invention is: an enhanced deaeration system for the water thermal energy storage system of a compressed air energy storage power station, characterized in that: it includes a high-temperature tank, a low-temperature tank, an enhanced turbulence system and an enhanced circulation system. The top of the high-temperature tank is connected to the connecting pipe through the high-temperature tank top shut-off valve, and the top of the low-temperature tank is connected to the connecting pipe through the low-temperature tank top shut-off valve;

[0015] The enhanced turbulence system is arranged in the high-temperature tank and the low-temperature tank; the enhanced circulation system includes a supercharger intake pipeline, a supercharger and a supercharger exhaust pipeline;

[0016] One end of the supercharger intake pipeline is connected to the connecting pipe and the other end is connected to the supercharger inlet;

[0017] One end of the supercharger exhaust pipeline is connected to the supercharger outlet and the other end is divided into two paths, one path is connected to the enhanced turbulence system in the high-temperature tank and the other path is connected to the enhanced turbulence system in the low-temperature tank.

[0018] In the above technical solution, the enhanced flow disturbance system includes an interface, an annular distribution pipe, and a plurality of nozzles. One end of the interface is connected to the exhaust pipe of the supercharger, and the other end is connected to the annular distribution pipe. The plurality of nozzles are arranged at intervals on the annular distribution pipe.

[0019] In the above technical solution, there are a plurality of annular distribution pipes. The plurality of annular distribution pipes are concentric circles with different radii and are interconnected with each other.

[0020] In the above technical solution, the annular distribution pipe is connected to the tank walls of the high-temperature tank and the low-temperature tank through a support frame.

[0021] In the above technical solution, a supercharger inlet shut-off valve is provided on the intake pipe of the supercharger. One end of the exhaust pipe of the supercharger is connected to the outlet of the supercharger through an outlet check valve, and the other end is divided into two paths. One path is sequentially connected to the enhanced flow disturbance system in the high-temperature tank through a first shut-off valve and a first check valve, and the other path is sequentially connected to the enhanced flow disturbance system in the low-temperature tank through a second shut-off valve and a second check valve.

[0022] In the above technical solution, a relief system is further included. The relief system includes an on-line oxygen concentration detector, a relief valve, and a silencer. The on-line oxygen concentration detector is provided on the connecting pipe and functions to automatically check the oxygen concentration in the connecting pipe and automatically control the opening and closing of the relief valve. One end of the relief valve is connected to the connecting pipe, and the other end is connected to the silencer.

[0023] In the above technical solution, the constant pressure system is connected to the connecting pipe through a constant pressure system air make-up shut-off valve.

[0024] In order to achieve the above second object, the technical solution of the present invention is: An operation method for an enhanced deoxidation system of a water thermal energy storage system for a compressed air energy storage power station, characterized by including the following stages:

[0025] Stage 1: After the compression energy storage stage of the compressed air energy storage power station ends, it enters a static stage, and the high-temperature tank is filled with heat transfer water. Close the shut-off valve at the top of the low-temperature tank and open the shut-off valve at the top of the high-temperature tank to connect the gas side space at the top of the high-temperature tank to the connecting pipe.

[0026] Start the enhanced circulation system, open the first shut-off valve, and close the second shut-off valve; the gas at the top of the high-temperature tank enters the booster through the booster inlet pipeline, is pressurized by the booster, and then enters the enhanced turbulence system of the high-temperature tank through the booster exhaust pipeline. It is evenly sprayed through the annular distribution pipe and nozzles, forms turbulence with the heat transfer medium water, and strengthens the reaction rate of chemical dosing deaeration in the heat transfer medium water; at the same time, the turbulent gas also plays a role in bubble deaeration, carrying part of the dissolved oxygen to the gas side space at the top of the high-temperature tank; through the above two mechanisms, the enhanced deaeration effect of the heat transfer medium water is achieved, and the dissolved oxygen concentration of the heat transfer medium water is reduced;

[0027] Stage 2: After the expansion power generation stage of the compressed air energy storage power station ends, it enters the static stage, and the low-temperature tank is filled with heat transfer medium water; close the shut-off valve at the top of the high-temperature tank, open the shut-off valve at the top of the low-temperature tank, and connect the gas side space at the top of the low-temperature tank with the connecting pipe;

[0028] Start the enhanced circulation system, open the second shut-off valve, and close the first shut-off valve; the gas at the top of the low-temperature tank enters the booster through the booster inlet pipeline, is pressurized by the booster, and then enters the enhanced circulation system of the low-temperature tank through the booster exhaust pipeline. It is evenly sprayed through the annular distribution pipe and nozzles, forms turbulence with the heat transfer medium water, and strengthens the reaction rate of chemical dosing deaeration in the heat transfer medium water; at the same time, the turbulent gas also plays a role in bubble deaeration, carrying part of the dissolved oxygen to the gas side space at the top of the low-temperature tank; through the above two mechanisms, the enhanced deaeration effect of the heat transfer medium water is achieved, and the dissolved oxygen concentration of the heat transfer medium water is reduced;

[0029] Stage 3: During the processes of Stage 1 and Stage 2, the oxygen concentration online detector of the discharge system monitors the oxygen concentration in the gas side space in real time. When the oxygen concentration exceeds the standard, the discharge valve is automatically opened for discharge, and the discharged gas is discharged into the atmosphere after noise reduction by the muffler; at the same time, the gas side pressure is closely monitored through the pressure measuring points originally designed in the heat storage system. When the pressure drops to the lower limit, the make-up gas shut-off valve of the constant pressure system is opened to supplement gas to the gas side space to prevent the heat transfer medium water from gasifying due to too low gas side pressure.

[0030] Compared with the prior art, the present invention has the following advantages:

[0031] 1) The present invention solves the problem of increased operating costs caused by excessive deaeration agents being put into the chemical dosing deaeration system of the water heat storage system of the existing compressed air energy storage power station to ensure the deaeration effect; the present invention reduces the power station operating costs and improves the economy of the compressed air energy storage power station.

[0032] 2) The present invention solves the problem that the reaction rate of deaeration decreases and the deaeration effect is poor in the static stage of the chemical dosing deaeration system of the water heat storage system of the existing compressed air energy storage power station; the present invention improves the deaeration reaction effect of the heat transfer medium water in the static stage and improves the safety and reliability of the compressed air energy storage power station.

[0033] 3) Compared with the prior art solution that simply increases the chemical dosage to ensure the deaeration effect, the present invention can effectively reduce the consumption of deaeration agents in power stations, reduce the operation costs of power stations, and improve the operation economy of power stations; through the enhanced deaeration system proposed by the present invention, the dosing deaeration reaction rate of the heat transfer medium water in the storage tank during the static stage can be increased. At the same time, the enhanced turbulence system can also play a role in bubble deaeration. Under the above dual deaeration mechanisms, the dissolved oxygen concentration of the heat transfer medium water can be effectively reduced, the corrosion rate of the heat storage system and the heat exchange system can be slowed down, and the safety and reliability of the power station can be improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 It is a schematic structural diagram of the present invention.

[0035] Figure 2 is Figure 1 the sectional view taken along line A-A in

[0036] Figure 3 is Figure 2 the sectional view taken along line B-B in

[0037] Wherein, 100 - high-temperature tank, 110 - high-temperature tank top shut-off valve, 200 - low-temperature tank, 210 - low-temperature tank top shut-off valve, 300 - enhanced turbulence system, 310 - interface, 320 - annular distribution pipe, 321 - support frame, 330 - nozzle, 400 - enhanced circulation system, 410 - supercharger inlet pipeline, 411 - supercharger inlet shut-off valve, 420 - supercharger, 421 - supercharger body, 422 - motor, 430 - supercharger exhaust pipeline, 431 - outlet check valve, 432 - first shut-off valve, 433 - first check valve, 434 - second shut-off valve, 435 - second check valve, 500 - connecting pipe, 510 - constant pressure system, 520 - constant pressure system air supply shut-off valve, 600 - relief system, 610 - on-line oxygen concentration detector, 620 - relief valve, 630 - silencer. DETAILED DESCRIPTION OF THE INVENTION

[0038] The implementation of the present invention will be described in detail below with reference to the drawings. However, they do not constitute a limitation to the present invention and are only for illustration purposes. At the same time, the advantages of the present invention will become clearer and easier to understand through the description.

[0039] Referring to the drawings, it can be seen that: as Figure 1 shown, an enhanced deaeration system for a water heat storage system of a compressed air energy storage power station includes a high-temperature tank 100, a low-temperature tank 200, an enhanced turbulence system 300, and an enhanced circulation system 400. The top of the high-temperature tank 100 is connected to the connecting pipe 500 through the high-temperature tank top shut-off valve 110, and the top of the low-temperature tank 200 is connected to the connecting pipe 500 through the low-temperature tank top shut-off valve 210; the constant pressure system 510 is connected to the connecting pipe 500 through the constant pressure system air supply shut-off valve 520;

[0040] The enhanced turbulence system 300 is arranged at the inner bottom of the high-temperature tank 100 and the low-temperature tank 200; the enhanced circulation system 400 includes a supercharger inlet pipeline 410, a supercharger 420 and a supercharger exhaust pipeline 430;

[0041] One end of the supercharger inlet pipeline 410 is connected to the connecting pipe 500, and the other end is connected to the inlet of the supercharger 420;

[0042] One end of the supercharger exhaust pipeline 430 is connected to the outlet of the supercharger 420, and the other end is divided into two paths. One path is connected to the enhanced turbulence system 300 in the high-temperature tank 100, and the other path is connected to the enhanced turbulence system 300 in the low-temperature tank 200.

[0043] Such as Figure 2 and Figure 3 As shown, the enhanced turbulence system 300 includes an interface 310, an annular distribution pipe 320 and a plurality of nozzles 330. One end of the interface 310 is connected to the supercharger exhaust pipeline 430, and the other end is connected to the annular distribution pipe 320. A plurality of the nozzles 330 are arranged at intervals on the annular distribution pipe 320.

[0044] There are a plurality of the annular distribution pipes 320. The plurality of annular distribution pipes 320 are concentric circles with different radii, and the plurality of annular distribution pipes 320 are connected to each other.

[0045] The annular distribution pipe 320 is connected to the tank walls of the high-temperature tank 100 and the low-temperature tank 200 through a support frame 321.

[0046] A supercharger inlet shut-off valve 411 is arranged on the supercharger inlet pipeline 410. One end of the supercharger exhaust pipeline 430 is connected to the outlet of the supercharger 420 through an outlet check valve 431, and the other end is divided into two paths. One path is connected to the enhanced turbulence system 300 in the high-temperature tank 100 through a first shut-off valve 432 and a first check valve 433 in sequence, and the other path is connected to the enhanced turbulence system 300 in the low-temperature tank 200 through a second shut-off valve 434 and a second check valve 435 in sequence.

[0047] It further includes a relief system 600. The relief system 600 includes an oxygen concentration on-line detector 610, a relief valve 620 and a silencer 630; the oxygen concentration on-line detector 610 is arranged on the connecting pipe 500, and the oxygen concentration on-line detector 610 is used to automatically check the oxygen concentration in the connecting pipe 500 and automatically control the opening and closing of the relief valve 620; one end of the relief valve 620 is connected to the connecting pipe 500, and the other end is connected to the silencer 630.

[0048] An operation method of an enhanced deoxidation system for a water thermal energy storage system in a compression energy storage power station, characterized by comprising the following stages:

[0049] Stage 1: After the compression energy storage stage of the compressed air energy storage power station ends, it enters the static stage. The high-temperature tank 100 is filled with heat transfer water; the shut-off valve 210 at the top of the low-temperature tank is closed, and the shut-off valve 110 at the top of the high-temperature tank is opened to connect the gas side space at the top of the high-temperature tank 100 with the connecting pipe 500;

[0050] Start the enhanced circulation system 400, open the first shut-off valve 432, and close the second shut-off valve 434; the gas at the top of the high-temperature tank 100 enters the booster 420 through the booster inlet pipeline 410 for boosting, and then enters the enhanced turbulence system 300 of the high-temperature tank 100 through the booster exhaust pipeline 430, and is evenly sprayed out through the annular distribution pipe 320 and the nozzles 330 to form turbulence with the heat transfer water, strengthening the reaction rate of the chemical deoxidation in the heat transfer water; at the same time, the turbulent gas also plays a role in bubbling deoxidation, carrying part of the dissolved oxygen to the gas side space at the top of the high-temperature tank 100; through the above two mechanisms, the enhanced deoxidation of the heat transfer water is realized, and the dissolved oxygen concentration of the heat transfer water is reduced;

[0051] Stage 2: After the expansion power generation stage of the compressed air energy storage power station ends, it enters the static stage. The low-temperature tank 200 is filled with heat transfer water; the shut-off valve 110 at the top of the high-temperature tank is closed, and the shut-off valve 210 at the top of the low-temperature tank is opened to connect the gas side space at the top of the low-temperature tank 200 with the connecting pipe 500;

[0052] Start the enhanced circulation system 400, open the second shut-off valve 434, and close the first shut-off valve 432; the gas at the top of the low-temperature tank 200 enters the booster 420 through the booster inlet pipeline 410 for boosting, and then enters the enhanced circulation system 400 of the low-temperature tank 200 through the booster exhaust pipeline 430, and is evenly sprayed out through the annular distribution pipe 320 and the nozzles 330 to form turbulence with the heat transfer water, strengthening the reaction rate of the chemical deoxidation in the heat transfer water; at the same time, the turbulent gas also plays a role in bubbling deoxidation, carrying part of the dissolved oxygen to the gas side space at the top of the low-temperature tank 200; through the above two mechanisms, the enhanced deoxidation of the heat transfer water is realized, and the dissolved oxygen concentration of the heat transfer water is reduced;

[0053] Stage 3: During the processes of Stage 1 and Stage 2, the oxygen concentration online detector 610 of the relief system 600 monitors the oxygen concentration in the gas side space in real time. When the oxygen concentration exceeds the standard, the relief valve 620 is automatically opened for relief, and the relieved gas is discharged into the atmosphere after noise reduction by the muffler 630; at the same time, the gas side pressure is closely monitored through the pressure measuring points originally designed in the heat storage system. When the pressure drops to the lower limit, the constant pressure system air supply shut-off valve 520 is opened to supply air to the gas side space to prevent the heat transfer water from vaporizing due to too low gas side pressure.

[0054] In actual use, the purpose of the enhanced circulation system 400 is to draw out the constant-pressure gas (usually nitrogen) at the tops of the high-temperature tank 100 and the low-temperature tank 200, boost its pressure through the booster 420, and then introduce it into the enhanced turbulence system 300 at the bottoms of the high-temperature tank 100 and the low-temperature tank 200 to provide turbulence gas for the enhanced turbulence system 300.

[0055] The function of the booster 420 is to increase the pressure of the turbulence gas to overcome the static pressure of the heat transfer medium water in the high-temperature tank 100 and the low-temperature tank 200. The booster 420 includes a booster body 421 and a motor 422. The booster 420 can be selected from a screw compressor or a centrifugal compressor according to the flow rate of the enhanced turbulence gas.

[0056] The first shut-off valve 432, the first check valve 433, the second shut-off valve 434, and the second check valve 435 isolate the heat transfer medium water system and the enhanced circulation system 400, and at the same time prevent the heat transfer medium water in the high-temperature tank 100 and the low-temperature tank 200 from flowing back into the enhanced circulation system 400.

[0057] The purpose of the enhanced turbulence system 300 is to introduce the boosted constant-pressure gas into the high-temperature tank 100 and the low-temperature tank 200 as turbulence gas and distribute it evenly. The turbulence gas forms a disturbance to the static heat transfer medium water in the high-temperature tank 100 and the low-temperature tank 200, strengthening the reaction rate of chemical addition and deoxidation in the heat transfer medium water. At the same time, the turbulence gas can also form a bubbling deoxidation effect in the high-temperature tank 100 and the low-temperature tank 200, further improving the deoxidation effect.

[0058] The interface 310 connects the annular distribution pipe 320 and the exhaust pipe line 430 of the booster. The interface 310 penetrates through the tank wall of the storage tank. The purpose of the annular distribution pipe 320 is to increase the turbulence area and expand the turbulence range as much as possible. According to the volume of the storage tank, a single annular distribution pipe 320 or multiple annular distribution pipes 320 can be adopted. The purpose of the nozzle 330 is to evenly eject the turbulence gas in the annular distribution pipe 320 so that the air flow forms a disturbance with the heat transfer medium water. The function of the support frame 321 is to support the annular distribution pipe 320 and ensure its stability. It can be welded and fixed to the tank wall of the storage tank with steel sections such as angle steel.

[0059] After adopting the enhanced flow disturbance system proposed by the present invention, the flow-disturbed gas forms bubble disturbances in the heat transfer medium water. In addition to enhancing the chemical dosing deaeration reaction, it can also play a role in bubble deaeration. Part of the dissolved oxygen in the heat transfer medium water precipitates into the gas-side space at the top of the storage tank under the action of the bubbles. To prevent the precipitated dissolved oxygen from redissolving into the heat transfer medium water, a venting system 600 is specifically provided. The venting system 600 automatically monitors the oxygen concentration in the constant-pressure gas at the top of the storage tank. When the concentration reaches a certain standard, the venting device is automatically activated to vent part of the constant-pressure gas. Among them, the on-line oxygen concentration detector 610 automatically checks the oxygen concentration in the constant-pressure gas. When the oxygen concentration exceeds the standard, an open-valve signal is sent to the vent valve 620. After receiving the open-valve command for the oxygen concentration exceeding the standard, the vent valve 620 automatically opens to vent the constant-pressure gas. The vented gas is discharged into the atmosphere after noise reduction by the silencer 630. When the pressure in the storage tank drops to a certain value after venting, the vent valve 620 is closed, and the nitrogen gas make-up shut-off valve 520 of the constant-pressure system is automatically opened to supplement nitrogen to the storage tank to prevent the heat transfer medium water from vaporizing due to too low pressure in the storage tank.

[0060] The enhanced circulation system 400 should be applied in combination with the enhanced flow disturbance system 300 of the high-temperature tank 100 and the low-temperature tank 200. That is, when enhanced deaeration is carried out in the high-temperature tank 100, the flow-disturbed gas should be led from the gas-side space at the top of the high-temperature tank 100; when enhanced deaeration is carried out in the low-temperature tank 200, the flow-disturbed gas should be led from the gas-side space at the top of the low-temperature tank 200; to avoid low-temperature gas entering the high-temperature tank 100 or high-temperature gas entering the low-temperature tank 200, resulting in losses of the heat storage system.

[0061] Considering that the rate of the chemical dosing deaeration reaction is related to temperature, and the higher the temperature, the faster the deaeration reaction rate; to reduce the operating power consumption of the present invention, the enhanced circulation system 400 should be preferentially started under the condition that the high-temperature tank 100 is filled with the heat transfer medium water to improve the chemical dosing deaeration effect; when the static time after the high-temperature tank 100 is filled with the heat transfer medium water is short and the operating effect of the enhanced circulation system 400 is limited, it is possible to consider starting the enhanced circulation system 400 on the side of the high-temperature tank 100 again during the static time after the low-temperature tank 200 is filled with the heat transfer medium water to ensure that the dissolved oxygen concentration in the heat storage system is qualified.

[0062] Other parts not described belong to the prior art.

Claims

1. An enhanced deaeration system for the water thermal energy storage system of a compressed air energy storage power station, characterized in that: It includes a high-temperature tank (100), a low-temperature tank (200), a strengthened flow disturbance system (300) and a strengthened circulation system (400). The top of the high-temperature tank (100) is connected to a connecting pipe (500) through a high-temperature tank top shut-off valve (110), and the top of the low-temperature tank (200) is connected to the connecting pipe (500) through a low-temperature tank top shut-off valve (210). The strengthened flow disturbance system (300) is arranged in the high-temperature tank (100) and the low-temperature tank (200). The strengthened circulation system (400) includes a supercharger intake pipeline (410), a supercharger (420) and a supercharger exhaust pipeline (430). One end of the supercharger intake pipeline (410) is connected to the connecting pipe (500), and the other end is connected to the inlet of the supercharger (420). One end of the supercharger exhaust pipeline (430) is connected to the outlet of the supercharger (420), and the other end is divided into two paths. One path is connected to the strengthened flow disturbance system (300) in the high-temperature tank (100), and the other path is connected to the strengthened flow disturbance system (300) in the low-temperature tank (200).

2. The enhanced deaeration system for the water thermal energy storage system of a compressed air energy storage power station according to claim 1, wherein: The strengthened flow disturbance system (300) includes an interface (310), an annular distribution pipe (320) and a plurality of nozzles (330). One end of the interface (310) is connected to the supercharger exhaust pipeline (430), and the other end is connected to the annular distribution pipe (320). The plurality of nozzles (330) are arranged at intervals on the annular distribution pipe (320).

3. The enhanced deaeration system for the water thermal energy storage system of a compressed air energy storage power station according to claim 2, characterized in that: There are a plurality of the annular distribution pipes (320). The plurality of annular distribution pipes (320) are concentric circles with different radii, and the plurality of annular distribution pipes (320) are interconnected with each other.

4. The enhanced deaeration system for the water thermal energy storage system of a compressed air energy storage power station according to claim 2, wherein: The annular distribution pipe (320) is connected to the tank walls of the high-temperature tank (100) and the low-temperature tank (200) through a support frame (321).

5. The enhanced deaeration system for the water thermal energy storage system of a compressed air energy storage power station according to claim 2, wherein: A supercharger inlet shut-off valve (411) is arranged on the supercharger intake pipeline (410). One end of the supercharger exhaust pipeline (430) is connected to the outlet of the supercharger (420) through an outlet check valve (431), and the other end is divided into two paths. One path is connected to the strengthened flow disturbance system (300) in the high-temperature tank (100) sequentially through a first shut-off valve (432) and a first check valve (433), and the other path is connected to the strengthened flow disturbance system (300) in the low-temperature tank (200) sequentially through a second shut-off valve (434) and a second check valve (435).

6. The enhanced deaeration system for the water thermal energy storage system of a compressed air energy storage power station according to claim 5, characterized in that: It further includes a relief system (600). The relief system (600) includes an oxygen concentration on-line detector (610), a relief valve (620) and a silencer (630). The oxygen concentration on-line detector (610) is arranged on the connecting pipe (500), and the oxygen concentration on-line detector (610) functions to automatically check the oxygen concentration in the connecting pipe (500) and automatically control the opening and closing of the relief valve (620). One end of the relief valve (620) is connected to the connecting pipe (500), and the other end is connected to the silencer (630).

7. The enhanced deaeration system for the water thermal energy storage system of a compressed air energy storage power station according to claim 6, characterized in that: A constant pressure system (510) is connected to the connecting pipe (500) through a constant pressure system air supply shut-off valve (520).

8. An operating method of an enhanced deaeration system for a water thermal energy storage system of a compressed air energy storage power station, characterized in that, It includes the following stages: Stage 1: After the compression energy storage stage of the compressed air energy storage power station ends, it enters the static stage. The high-temperature tank (100) is filled with heat transfer water; the shut-off valve (210) at the top of the low-temperature tank is closed, and the shut-off valve (110) at the top of the high-temperature tank is opened to connect the gas side space at the top of the high-temperature tank (100) with the connecting pipe (500). Start the enhanced circulation system (400), open the first shut-off valve (432), and close the second shut-off valve (434); the gas at the top of the high-temperature tank (100) enters the booster (420) through the booster inlet pipeline (410), and after being boosted, it enters the enhanced turbulence system (300) of the high-temperature tank (100) through the booster exhaust pipeline (430), and is evenly sprayed out through the annular distribution pipe (320) and the nozzles (330) to form a disturbance with the heat transfer water, strengthening the reaction rate of the chemical addition deaeration in the heat transfer water; at the same time, the turbulent gas also plays a role in bubble deaeration, carrying part of the dissolved oxygen to the gas side space at the top of the high-temperature tank (100); through the above two mechanisms, the enhanced deaeration of the heat transfer water is realized, and the dissolved oxygen concentration of the heat transfer water is reduced. Stage 2: After the expansion power generation stage of the compressed air energy storage power station ends, it enters the static stage. The low-temperature tank (200) is filled with heat transfer water; the shut-off valve (110) at the top of the high-temperature tank is closed, and the shut-off valve (210) at the top of the low-temperature tank is opened to connect the gas side space at the top of the low-temperature tank (200) with the connecting pipe (500). Start the enhanced circulation system (400), open the second shut-off valve (434), and close the first shut-off valve (432); the gas at the top of the low-temperature tank (200) enters the booster (420) through the booster inlet pipeline (410), and after being boosted, it enters the enhanced circulation system (400) of the low-temperature tank (200) through the booster exhaust pipeline (430), and is evenly sprayed out through the annular distribution pipe (320) and the nozzles (330) to form a disturbance with the heat transfer water, strengthening the reaction rate of the chemical addition deaeration in the heat transfer water; at the same time, the turbulent gas also plays a role in bubble deaeration, carrying part of the dissolved oxygen to the gas side space at the top of the low-temperature tank (200); through the above two mechanisms, the enhanced deaeration of the heat transfer water is realized, and the dissolved oxygen concentration of the heat transfer water is reduced. Stage 3: During the processes of Stage 1 and Stage 2, the oxygen concentration online detector (610) of the venting system (600) monitors the oxygen concentration in the gas side space in real time. When the oxygen concentration exceeds the standard, the venting valve (620) is automatically opened for venting, and the vented gas is discharged into the atmosphere after noise reduction by the muffler (630); at the same time, the gas side pressure is closely monitored through the pressure measuring points originally designed in the heat storage system. When the pressure drops to the lower limit, the make-up air shut-off valve (520) of the constant pressure system is opened to make up air for the gas side space to prevent the heat transfer water from vaporizing due to too low gas side pressure.

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