Condensate water recovery system of compressed air energy storage power station

Abstract

The utility model provides a condensate water recovery system of a compressed air energy storage power station, which comprises a flash tank with a plurality of pipeline inlets, and the pipeline inlets of the plurality of pipeline inlets are respectively connected with drainage pipelines corresponding to all stages of gas-liquid separators. The flash tank is used for receiving condensate water separated by each stage of gas-liquid separator through the drainage pipeline; the condensate pump bypass is connected with the condensate pump in parallel, pipeline inlets of the condensate pump and the condensate pump bypass are connected with a pipeline outlet of the flash tank, and pipeline outlets of the condensate pump and the condensate pump bypass are connected with a circulating cooling system of the compressed air energy storage power station through a recycling pipeline. And the condensate pump or the condensate pump bypass is used for conveying condensate water to the circulating cooling system through the recovery pipeline when being started. According to the scheme, the condensed water separated by each stage of gas-liquid separator can be safely and effectively recovered and utilized, so that the waste of water resources can be avoided.

Description

Technical Field

[0001] This specification relates to the technical field of compressed air energy storage, and particularly to a condensate recovery system for a compressed air energy storage power station. Background Art

[0002] Compressed air energy storage is an important form of energy storage, which has the advantages of high energy storage, high energy density and power density, low operating cost, long service life, etc., and can be applied in compressed air energy storage power stations.

[0003] Compressed air energy storage can be mainly divided into two processes: energy storage and energy release. During energy storage, an electric motor drives an air compressor to draw air from the environment, compress it to a high-pressure state and store it in a gas storage tank. Electrical energy is converted into the internal energy of compressed air in this process. During energy release, the compressed air stored in the gas storage device enters an air turbine to expand and do work to generate electricity. The internal energy and potential energy contained in the compressed air are re-converted into electrical energy. Compressed air energy storage technologies mainly include: traditional compressed air energy storage, adiabatic compressed air energy storage, isothermal compressed air energy storage, liquid compressed air energy storage, etc. Among them, adiabatic compressed air energy storage can minimize heat dissipation by taking good heat insulation measures to reduce heat exchange between the air compressor and the environment, and can approach the adiabatic compression process to the greatest extent. At the same time, by increasing the single-stage compression ratio of the air compressor, compressed air with a higher temperature and higher-grade compressed thermal energy can be obtained, and the pressure potential energy and compressed thermal energy can be decoupled and stored. During the energy release process, the stored compressed thermal energy can be used to heat the air at the inlet of the air turbine to achieve non-supplementary fuel compressed air energy storage without supplementary fuel.

[0004] In a subsystem (compressed energy storage system) of an adiabatic compressed air energy storage system, during the compressed energy storage process, an electric motor drives each stage of the compressor to do work on the air, generating high-temperature and high-pressure air. Since the air contains moisture, condensate will be precipitated after being cooled by a heat exchanger (the heat exchanger exchanges heat with a heat storage medium), and the condensate is discharged from the system after being separated by each stage of gas-liquid separator. If it is not effectively recycled, it will cause waste of water resources.

[0005] Due to the different pressures of the working fluids at the outlets of each stage of the compressor, the pressures of the condensate separated by each stage of gas-liquid separator will also be different. The existing recovery methods are not applicable to the recovery of the condensate separated by each stage of gas-liquid separator. Directly using the existing recovery methods for recovery has certain safety hazards, and the existing technology cannot achieve the effective recovery and utilization of condensate in a compressed air energy storage power station, thus causing problems such as waste of water resources.

[0006] In response to the above problems, no effective solution has been proposed yet. Utility Model Content

[0007] This specification provides a condensate recovery system for a compressed air energy storage power station to solve the problem in the prior art that the condensate separated by gas-liquid separators at all levels cannot be safely and effectively recovered and utilized, resulting in waste of water resources.

[0008] To solve the above technical problems, an embodiment of this specification provides a condensate recovery system for a compressed air energy storage power station, including:

[0009] A flash tank with multiple pipeline inlets, each of the multiple pipeline inlets is respectively connected to the drainage pipeline corresponding to the gas-liquid separator at each level, and the flash tank is used to receive the condensate separated by the gas-liquid separators at each level through the drainage pipeline;

[0010] A condensate pump and a condensate pump bypass arranged in parallel with the condensate pump. The pipeline inlets of the condensate pump and the condensate pump bypass are connected to the pipeline outlet of the flash tank, and the pipeline outlets of the condensate pump and the condensate pump bypass are connected to the circulating cooling system of the compressed air energy storage power station through a recovery pipeline. The condensate pump or the condensate pump bypass is used to convey condensate to the circulating cooling system through the recovery pipeline when it is turned on.

[0011] In some embodiments, electric globe valves are arranged on the drainage pipelines corresponding to the gas-liquid separators at each level, and the electric globe valves are used to isolate and shut off the flash tank and the corresponding gas-liquid separators at each level.

[0012] In some embodiments, the flash tank is arranged at a low position. The multiple pipeline inlets of the flash tank at least include a first pipeline inlet, a second pipeline inlet, and a third pipeline inlet. The first pipeline inlet is connected to the first drainage pipeline corresponding to the first-stage gas-liquid separator, the second pipeline inlet is connected to the second drainage pipeline corresponding to the second-stage gas-liquid separator, and the third pipeline inlet is connected to the third drainage pipeline corresponding to the third-stage gas-liquid separator.

[0013] In some embodiments, a water level monitoring device is arranged inside the flash tank, and the water level monitoring device is used to send a generated water level signal to the control system when it monitors that the condensate reaches the set water level value.

[0014] In some embodiments, a pressure monitoring device is also arranged inside the flash tank, and the pressure monitoring device is used to monitor the internal pressure of the flash tank.

[0015] In some embodiments, first electric gate valves are arranged before and after the condensate pump, and the condensate pump is used to provide a head for the conveyance of condensate.

[0016] In some embodiments, a second electric gate valve is arranged on the condensate pump bypass.

[0017] In some embodiments, the control system is used to control the opening and closing of a first motorized valve of a condensate pump or a second motorized valve of a condensate pump bypass.

[0018] In some embodiments, a flow measurement device is provided on the recovery pipeline, and the flow measurement device is used to measure the flow rate of condensate water in the recovery pipeline.

[0019] In some embodiments, the circulating cooling system includes a thermal equipment cooling module, and the thermal equipment cooling module is connected to the pipeline outlets of the condensate pump and the condensate pump bypass, and is used to receive condensate water and cool the mechanical equipment in the compressed air energy storage power station.

[0020] An embodiment of the present specification provides a condensate water recovery system for a compressed air energy storage power station, including: a flash tank having a plurality of pipeline inlets, each of the pipeline inlets of the plurality of pipeline inlets is respectively connected to the drainage pipelines corresponding to each stage of gas-liquid separators, and the flash tank is used to receive the condensate water separated by each stage of gas-liquid separators through the drainage pipelines; a condensate pump and a condensate pump bypass arranged in parallel with the condensate pump, the pipeline inlets of the condensate pump and the condensate pump bypass are connected to the pipeline outlet of the flash tank, the pipeline outlets of the condensate pump and the condensate pump bypass are connected to the circulating cooling system of the compressed air energy storage power station through a recovery pipeline, and the condensate pump or the condensate pump bypass is used to convey condensate water to the circulating cooling system through the recovery pipeline when it is opened. In the embodiment of the present specification, the drainage pipelines corresponding to each stage of gas-liquid separators can be connected or accessed to the pipeline inlets of the flash tank of the condensate water recovery system, so that the flash tank can receive the condensate water separated by each stage of gas-liquid separators, and the pipeline outlets of the condensate pump and the condensate pump bypass can be connected or accessed to the circulating cooling system of the compressed air energy storage power station, so that when the condensate pump or the condensate pump bypass is opened, the condensate water is recovered or collected into the circulating cooling system, thereby reducing the makeup water volume of the circulating cooling system, avoiding waste of water resources, and realizing full utilization of water resources. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the present specification or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments recorded in the present specification. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings. In the drawings:

[0022] Figure 1 is a schematic structural diagram of a condensate water recovery system for a compressed air energy storage power station provided by an embodiment of the present specification;

[0023] Figure 2It is a schematic diagram of the overall structure of the condensate recovery system of the compressed air energy storage power station provided by the embodiments of this specification. Detailed implementation manners

[0024] In order to enable those skilled in the art to better understand the technical solutions in this specification, the technical solutions in the embodiments of this specification will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of this specification. Obviously, the described embodiments are only a part of the embodiments of this specification, rather than all the embodiments. Based on the embodiments in this specification, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of this specification.

[0025] Refer to Figure 1 As shown, the condensate recovery system of the above-mentioned compressed air energy storage power station may include:

[0026] A flash tank having a plurality of pipeline inlets, each of the pipeline inlets of the plurality of pipeline inlets is respectively connected to the drainage pipelines corresponding to the gas-liquid separators at all levels, and the flash tank can be used to receive the condensate separated by the gas-liquid separators at all levels through the drainage pipelines;

[0027] A condensate pump and a condensate pump bypass arranged in parallel with the condensate pump. The pipeline inlets of the condensate pump and the condensate pump bypass are connected to the pipeline outlet of the flash tank, and the pipeline outlets of the condensate pump and the condensate pump bypass are connected to the circulating cooling system of the compressed air energy storage power station through a recovery pipeline. The condensate pump or the condensate pump bypass can be used to convey condensate to the circulating cooling system through the recovery pipeline when it is turned on.

[0028] In some embodiments, the above-mentioned gas-liquid separators at all levels may be located in the compression energy storage system of the compressed air energy storage power station (the compression energy storage system may be a subsystem of an adiabatic compressed air energy storage system). The gas-liquid separators at all levels can be used to separate the condensate in the air at the inlets of the compressors at all levels in the compression energy storage system to avoid water ingress into the compressors. The above-mentioned circulating cooling system may also be located in the compressed air energy storage power station. Since the condensate separated by the gas-liquid separators at all levels in the compression energy storage system is generally directly discharged from the system, and the water demand of the circulating cooling system is relatively large, this will cause the separated condensate to be unable to be supplied to the circulating cooling system, that is, the makeup water of the circulating cooling system cannot be reduced, so that the full utilization of water resources cannot be achieved, resulting in waste of water resources.

[0029] To solve this problem, a condensate recovery system for recovering the condensate of the gas-liquid separators at all levels can be added between the compression energy storage system and the circulating cooling system, so that the condensate separated by the gas-liquid separators at all levels in the compression energy storage system can be recovered or collected into the circulating cooling system to reduce the makeup water of the circulating cooling system and avoid waste of water resources.

[0030] Figure 1 The gray part is the condensate recovery system of the compressed air energy storage power station, which may include a flash tank, a condensate pump, and a condensate pump bypass arranged in parallel with the condensate pump. The pipeline inlets of the condensate pump and the condensate pump bypass are connected to the pipeline outlet of the flash tank. The drainage pipelines corresponding to the gas-liquid separators at all levels in the compressed energy storage system can be connected to or access the pipeline inlet of the flash tank of the condensate recovery system, so that the flash tank can receive the condensate separated by the gas-liquid separators at all levels. The pipeline outlets of the condensate pump and the condensate pump bypass can be connected to or access the circulating cooling system of the compressed air energy storage power station, so that when the condensate pump or the condensate pump bypass is opened, the condensate is recovered or collected into the circulating cooling system.

[0031] In some embodiments, corresponding motorized globe valves are provided on the drainage pipelines corresponding to the gas-liquid separators at all levels, and the motorized globe valves can be used to isolate and shut off the flash tank and the corresponding gas-liquid separators at all levels.

[0032] Specifically, referring to Figure 1 As shown, the gas-liquid separators at all levels may include a first-stage gas-liquid separator, a second-stage gas-liquid separator, and a third-stage gas-liquid separator. The drainage pipelines corresponding to the gas-liquid separators at all levels may include: a first drainage pipeline corresponding to the first-stage gas-liquid separator, a second drainage pipeline corresponding to the second-stage gas-liquid separator, and a third drainage pipeline corresponding to the third-stage gas-liquid separator. Correspondingly, a first motorized globe valve may be provided on the first drainage pipeline, and the first motorized globe valve can isolate and shut off the flash tank and the first-stage gas-liquid separator. A second motorized globe valve may be provided on the second drainage pipeline, and the second motorized globe valve can isolate and shut off the flash tank and the second-stage gas-liquid separator. A third motorized globe valve may be provided on the third drainage pipeline, and the third motorized globe valve can isolate and shut off the flash tank and the third-stage gas-liquid separator. That is, the motorized globe valves (which may include the first motorized globe valve, the second motorized globe valve, and the third motorized globe valve) can be used to isolate and shut off the compressed energy storage system and the condensate recovery system, and their positions may be located between the corresponding gas-liquid separators at all levels and the flash tank.

[0033] In some embodiments, the above-mentioned motorized globe valves can also be used as the maintenance shut-off valves of the flash tank, and the number of motorized globe valves can be adjusted according to actual needs, and this specification does not make specific limitations on this.

[0034] In some embodiments, the above-mentioned flash tank can be arranged at a lower position. The multiple pipeline inlets of the flash tank can at least include a first pipeline inlet, a second pipeline inlet, and a third pipeline inlet. The first pipeline inlet is connected to the first drain pipeline corresponding to the first-stage gas-liquid separator, the second pipeline inlet is connected to the second drain pipeline corresponding to the second-stage gas-liquid separator, and the third pipeline inlet is connected to the third drain pipeline corresponding to the third-stage gas-liquid separator.

[0035] Specifically, referring to Figure 1 As shown, the flash tank can have multiple pipeline inlets (such as: a first pipeline inlet, a second pipeline inlet, and a third pipeline inlet). The first pipeline inlet can be connected to the first drain pipeline, the second pipeline inlet can be connected to the second drain pipeline, and the third pipeline inlet can be connected to the third drain pipeline. By connecting the drain pipelines corresponding to each stage of the gas-liquid separator, the flash tank can receive the condensed water separated by each stage of the gas-liquid separator, thereby expanding and relieving the pressure of the condensed water received from each stage of the gas-liquid separator, and reducing the pressure of the condensed water of each stage of the gas-liquid separator to the same slightly positive pressure (slightly higher than the pressure of the circulating cooling system). By reducing to the same slightly positive pressure, potential safety hazards during the recovery process can be avoided.

[0036] Among them, the flash tank is arranged at a lower position, so that the condensed water separated by each stage of the gas-liquid separator can be effectively received.

[0037] In some embodiments, a spare interface can also be provided on the above-mentioned flash tank. The spare interface can be set as a redundancy and can be in a blocked state during normal operation. When any other pipeline inlet of the flash tank cannot be used, the spare interface can be used for replacement.

[0038] For each pipeline inlet among the multiple pipeline inlets of the above-mentioned flash tank, different grades of buffer devices (such as: orifice plates, etc.) can also be set according to the inlet pressure. By setting different buffer devices, the functions of protection and shock absorption can be achieved, ensuring that the flash tank can smoothly receive the condensed water separated by each stage of the gas-liquid separator.

[0039] In some embodiments, a water level monitoring device can be arranged inside the above-mentioned flash tank. The water level monitoring device can be used to send the generated water level signal to the control system when it monitors that the condensed water reaches the set water level value.

[0040] Specifically, the above-mentioned water level monitoring device can be used to monitor the water level inside the flash tank. When it monitors that the water level reaches the set water level value, it can generate a water level signal and send or feedback the generated water level signal to the control system, such as: the DCS system.

[0041] In some embodiments, a pressure monitoring device is also arranged inside the above-mentioned flash tank. The pressure monitoring device can be used to monitor the internal pressure of the flash tank.

[0042] Specifically, when the pressure measuring device measures the internal pressure of the flash tank (the pressure of the chamber), it can generate a pressure signal and can also send or feedback the pressure signal to the above-mentioned control system.

[0043] In some embodiments, a first electric gate valve is provided before and after the condensate pump, and the condensate pump can be used to provide a head for the conveyance of condensate.

[0044] In some embodiments, a second electric gate valve is provided on the bypass of the condensate pump.

[0045] Specifically, the above-mentioned condensate pump has a low lift, can overcome the pipeline resistance and the terrain height difference, and provide a head for the medium, that is, can provide a head for the conveyance of condensate.

[0046] The above-mentioned first electric gate valve can be used for shutting off during the maintenance of the condensate pump. The above-mentioned first electric gate valve and the above-mentioned second electric gate valve can be opened or closed according to the working conditions or the working condition requirements, that is, one of the condensate pump and the condensate pump bypass can be opened or shut off according to the working conditions or the working condition requirements.

[0047] In some embodiments, the above-mentioned control system can be used to control the opening and closing of the first electric gate valve of the condensate pump or the second electric gate valve of the condensate pump bypass.

[0048] Specifically, after the control system receives the water level signal sent by the water level monitoring device that the current water level reaches the water level set value, it can determine that the first electric gate valve of the condensate pump or the second electric gate valve of the condensate pump bypass can be opened. At this time, it is necessary to further combine the pressure signal sent by the pressure measuring device, and then further determine whether it is the first electric gate valve or the second electric gate valve that is opened, and then control the opening or starting of the first electric gate valve or the second gate valve.

[0049] For example: when the control system receives the water level signal, it can determine that the electric gate valve can be opened. After receiving the pressure signal, it judges the current working conditions. If the pressure of the flash tank can overcome the pipeline valve resistance and the height difference and flow to the circulating cooling system by gravity (specifically flow to the heat equipment cooling module of the circulating cooling system), the control system controls the opening of the second electric gate valve of the condensate pump bypass; if the pressure of the flash tank is not enough to overcome the pipeline valve resistance and the height difference and cannot flow to the circulating cooling system by gravity, the control system controls the opening of the first electric gate valve of the condensate pump.

[0050] By controlling whether it is the first electric gate valve or the second electric gate valve that is opened, the power consumption of the condensate pump can be reduced.

[0051] In some embodiments, a flow measuring device is provided on the above-mentioned recovery pipeline, and the flow measuring device can be used to measure the flow rate of condensate in the recovery pipeline.

[0052] Specifically, the flow rate measured by the flow measurement device (which can generate a flow signal) can also be sent to the above-mentioned control system, so that the control system can control the flow rate of the condensed water in the recovery pipeline, avoiding pipeline damage caused by excessive flow rate and the like.

[0053] In some embodiments, the above-mentioned circulating cooling system may include a thermal equipment cooling module, which is connected to the condensate pump and the pipeline outlet bypassing the condensate pump, and can be used to receive condensed water and cool the mechanical equipment in the compressed air energy storage power station.

[0054] Specifically, the pipeline outlet of the condensate pump and the bypass of the condensate pump are connected to the thermal equipment cooling module of the compression cycle cooling system through the recovery pipeline, so that the thermal equipment cooling module can receive condensed water, and thus can timely cool the mechanical equipment in the main cooling plant and the heat exchange area of the compressed air energy storage power station.

[0055] The condensate water recovery system of the above-mentioned compressed air energy storage power station has the following advantages:

[0056] (1) By setting an expansion vessel, the pressure gradient of the condensate water of each stage of the gas-liquid separator can be effectively balanced, and the condensate water can be expanded and depressurized to the same pressure to ensure safe and stable operation.

[0057] (2) By setting a condensate pump and a bypass of the condensate pump after the expansion vessel, the first electric gate valve of the condensate pump or the second electric gate valve of the bypass of the condensate pump can be determined according to the working conditions, so as to reduce the power consumption of the equipment.

[0058] (3) By setting a water level monitoring device and a flow measurement device inside the expansion vessel, and connecting the corresponding water level signal and pressure signal to the power station DCS system, the start and stop of the first electric gate valve of the cooling water pump or the second electric gate valve of the bypass of the condensate pump can be controlled, realizing the automatic start and stop function.

[0059] (4) By the condensate water recovery system of the compressed air energy storage power station, the condensate water separated by each stage of the gas-liquid separator is recovered to the thermal equipment cooling module in the circulating cooling system, which can reduce the makeup water volume of the circulating cooling system and avoid waste of water resources.

[0060] Refer to Figure 2 As shown, the compressed air energy storage power station may include: a compression energy storage system, a circulating cooling system, and a condensate water recovery system. The condensate water recovery system is located between the compression energy storage system and the circulating cooling system, and is used to recover the condensate water separated by each stage of the gas-liquid separator in the compression energy storage system to the thermal equipment module of the circulating cooling system, so as to avoid the problem of waste of water resources in the compressed air energy storage power station.

[0061] Among them, the compressed energy storage system can adopt the method of double-line four-stage compression and intermediate cooling to compress and store air in the gas storage reservoir. Air can enter the No. 1 compressor and the No. 2 compressor (which can be called the first-stage air compressor) through the air inlet. After being compressed by the first-stage air compressor, it sequentially passes through the heat exchanger 1 and the first-stage gas-liquid separator, and then enters the No. 3 compressor and the No. 4 compressor (which can be called the second-stage air compressor). After being compressed by the second-stage air compressor, the air sequentially passes through the heat exchanger 2 and the second-stage gas-liquid separator, and then enters the No. 5 compressor and the No. 6 compressor (which can be called the third-stage air compressor). After being compressed by the third-stage air compressor, the air sequentially passes through the heat exchanger 3 and the third-stage gas-liquid separator, and then enters the No. 7 compressor and the No. 8 compressor (which can be called the fourth-stage air compressor). After being compressed by the fourth-stage air compressor, the air is cooled by the heat exchanger, and the double-line high-pressure compressed air is merged and fed into the gas storage reservoir. While the heat exchanger cools the air, the high-pressure water absorbs heat and stores the heat generated during the air compression process in the high-pressure water tank.

[0062] Among them, the circulating cooling system can be an open-circuit circulating cooling system. The thermal equipment cooling module (or the equipment cooling system in the main plant and heat exchange area) adopts an extended unit system secondary circulating water supply system with a mechanical draft cooling tower. The high-temperature water after absorbing heat is transported through pipelines to the mechanical draft cooling tower for cooling. After the cooled water is boosted by the circulating water pump, it is transported through pipelines to the thermal equipment cooling module. The makeup water source of the circulating cooling system is supplemented to the cooling tower water tank after being sedimented and treated by the reservoir purification station.

[0063] Specifically, the reservoir purification station in the circulating cooling system purifies the water coming from outside the plant. After that, the purified water except for other uses is pumped into the thermal equipment cooling module for cooling by the pressure of the circulating water pump, and then the temperature of the cooling water is reduced by the mechanical draft cooling tower, and then it is pumped into the thermal equipment cooling module by the pressure of the circulating water pump.

[0064] Since the circulating cooling system has a large water demand, the water coming from outside the plant needs to be sedimented and treated by the plant purification station before entering the thermal equipment cooling module. Losses such as evaporation, wind blowing, and wastewater treatment are inevitable. How to reduce the water loss in other aspects and achieve the full utilization of water resources is one of the effective means to improve energy conservation and environmental protection.

[0065] Therefore, a condensate recovery system can be added to the compressed air energy storage power station, which can include an expansion vessel, a condensate pump, and a condensate pump bypass arranged in parallel with the condensate pump. The specific connection method is as follows:

[0066] 3. A pipeline is connected to the drain outlet of the inlet gas-liquid separator (the first-stage gas-liquid separator) of each of the No. 3 and No. 4 air compressors. The two pipelines are merged into one pipeline (the first drainage pipeline) nearby and then connected to the flash tank through the first electric stop valve corresponding to the first-stage gas-liquid separator. The first drainage pipeline slopes downward along the flow direction without any low points where water accumulates in the middle to ensure smooth water flow and avoid water stagnation or backflow.

[0067] A pipeline is connected to the drain outlet of the inlet gas-liquid separator (the second-stage gas-liquid separator) of each of the No. 5 and No. 6 air compressors. The two pipelines are merged into one pipeline (the second drainage pipeline) nearby and then connected to the flash tank through the second electric stop valve corresponding to the second-stage gas-liquid separator. The pipeline slopes downward along the flow direction without any low points where water accumulates in the middle.

[0068] A pipeline is connected to the drain outlet of the inlet gas-liquid separator (the third-stage gas-liquid separator) of each of the No. 7 and No. 8 air compressors. The two pipelines are merged into one pipeline (the third drainage pipeline) nearby and then connected to the flash tank through the third electric stop valve corresponding to the third-stage gas-liquid separator. The pipeline slopes downward along the flow direction without any low points where water accumulates in the middle.

[0069] A pipeline outlet is provided at the bottom of the flash tank and is connected to the cooling module of the thermal equipment through a pipeline. A condensate pump, the first electric gate valve before and after the condensate pump, a bypass of the condensate pump, and the second electric gate valve of the bypass are provided on the pipeline.

[0070] A water level monitoring device and a pressure measuring device are provided on the flash tank. The generated water level signal and pressure signal are connected to the power station DCS system to realize linkage with the cooling water pump, the first electric gate valve before and after it, and the actuator of the second electric gate valve of the bypass.

[0071] The rated pressure inside the flash tank is slightly higher than the rated pressure of the thermal equipment cooling module + the pressure difference due to the height difference between the flash tank outlet and the interface of the thermal equipment cooling module + the frictional and local resistance losses along the pipeline (bypass).

[0072] Taking a 300MW compressed air energy storage power station as an example, the working conditions of the condensate recovery system of the compressed air energy storage power station under two typical working conditions are described under the rated working conditions and partial load operation of the unit:

[0073] Typical working condition 1:

[0074] Assume that the head of the circulating water pump (17) (the head refers to the effective head of the pump, that is, the net increase in energy obtained by the unit mass of fluid passing through the pump) is 0.4 MPa, and the pressure loss at the interface between the outlet of the circulating water pump and the condensate recovery pipeline on the cooling water pipeline of the thermal system is 0.15 MPa. The pressure difference between the outlet of the flash tank and the cooling water interface of the thermal system + the frictional and local resistance losses along the pipeline (bypass) is 0.05 MPa, the pressure difference between the outlet of the gas-liquid separator and the inlet of the flash tank + the frictional and local resistance losses along the pipeline (bypass) is 0.05 MPa, and the internal pressure of the flash tank is 0.35 MPa. The condensate pressure of the first-stage gas-liquid separator is 0.5 MPa, the condensate pressure of the second-stage gas-liquid separator is 2.5 MPa, and the condensate pressure of the third-stage gas-liquid separator is 10.5 MPa.

[0075] During the operation of the compressed energy storage main system, open the first electric stop valve, the second electric stop valve, and the third electric stop valve. The condensate enters the flash tank through the first electric stop valve, the second electric stop valve, and the third electric stop valve, and the pressure drops to 0.35 MPa. Monitor the water level. When the water level reaches the set value, the water level signal is fed back to the DCS. Monitor the pressure, and the pressure signal is fed back to the DCS. The DCS controls the opening of the actuator of the second electric gate valve in the condensate pump bypass, and the condensate flows to the cooling module of the thermal equipment through the condensate pump bypass.

[0076] Typical condition 2:

[0077] Assume that the head of the circulating water pump (17) is 0.4 MPa, and the pressure loss at the interface between the outlet of the circulating water pump and the condensate recovery pipeline on the cooling water pipeline of the thermal system is 0.15 MPa. The pressure difference between the outlet of the flash tank and the cooling water interface of the thermal system + the frictional and local resistance losses along the pipeline (bypass) is 0.1 MPa, the pressure difference between the outlet of the gas-liquid separator and the inlet of the flash tank + the frictional and local resistance losses along the pipeline (bypass) is 0.1 MPa, and the internal pressure of the flash tank is 0.35 MPa. The condensate pressure of the first-stage gas-liquid separator is 0.5 MPa, the condensate pressure of the second-stage gas-liquid separator is 2.5 MPa, and the condensate pressure of the third-stage gas-liquid separator is 10.5 MPa.

[0078] During the operation of the compressed energy storage main system, open the first electric stop valve, the second electric stop valve, and the third electric stop valve. The condensate enters the flash tank through the first electric stop valve, the second electric stop valve, and the third electric stop valve, and the pressure drops to 0.35 MPa. Monitor the water level. When the water level reaches the set value, the water level signal is fed back to the DCS. Monitor the pressure, and the pressure signal is fed back to the DCS. The DCS controls the opening of the actuator of the first electric gate valve before and after the condensate pump, and the condensate flows to the cooling module of the thermal equipment through the condensate pump.

[0079] Through the above solution, the condensed water separated by gas-liquid separators at all levels can be safely and effectively recovered and utilized, thus avoiding waste of water resources and fully considering the pressure matching problem of the condensed water receiving system.

[0080] Each embodiment in this specification is described in a progressive manner. For the same or similar parts among the embodiments, reference can be made to each other. Each embodiment focuses on the differences from other embodiments. In particular, for the system embodiment, since it is basically similar to the method embodiment, the description is relatively simple. For the relevant parts, reference can be made to the partial description of the method embodiment. In the description of this specification, the description with reference to terms such as "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the embodiments of this specification. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples. In addition, without contradiction, those skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples.

[0081] The above is only the embodiment of the embodiments of this specification and is not used to limit the embodiments of this specification. For those skilled in the art, various changes and modifications can be made to the embodiments of this specification. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the embodiments of this specification shall be included within the scope of the claims of the embodiments of this specification.

Claims

1. A condensate recovery system for a compressed air energy storage power station, characterized in that Comprising: A flash tank having a plurality of pipeline inlets, each of the pipeline inlets of the plurality of pipeline inlets being respectively connected to the drain pipelines corresponding to the gas-liquid separators at all levels, and the flash tank being configured to receive the condensed water separated by the gas-liquid separators at all levels through the drain pipelines; A condensate pump and a condensate pump bypass arranged in parallel with the condensate pump, the pipeline inlets of the condensate pump and the condensate pump bypass being connected to the pipeline outlet of the flash tank, and the pipeline outlets of the condensate pump and the condensate pump bypass being connected to the circulating cooling system of the compressed air energy storage power station through a recovery pipeline, and the condensate pump or the condensate pump bypass being configured to convey the condensed water to the circulating cooling system through the recovery pipeline when it is turned on.

2. The condensate recovery system according to claim 1, wherein Electric globe valves corresponding to the drain pipelines of the gas-liquid separators at all levels are provided on the drain pipelines corresponding to the gas-liquid separators at all levels, and the electric globe valves are configured to isolate and shut off the flash tank and the corresponding gas-liquid separators at all levels.

3. The condensate recovery system according to claim 1, wherein, The flash tank is arranged at a low position, and the plurality of pipeline inlets of the flash tank at least include a first pipeline inlet, a second pipeline inlet, and a third pipeline inlet. The first pipeline inlet is connected to the first drain pipeline corresponding to the first-stage gas-liquid separator, the second pipeline inlet is connected to the second drain pipeline corresponding to the second-stage gas-liquid separator, and the third pipeline inlet is connected to the third drain pipeline corresponding to the third-stage gas-liquid separator.

4. The condensate recovery system according to claim 1, characterized in that A water level monitoring device is arranged inside the flash tank, and the water level monitoring device is configured to send a generated water level signal to a control system when it monitors that the condensed water reaches a set water level value.

5. The condensate recovery system according to claim 1, wherein, A pressure monitoring device is further arranged inside the flash tank, and the pressure monitoring device is configured to monitor the internal pressure of the flash tank.

6. The condensate recovery system according to claim 1, wherein, First electric gate valves are arranged before and after the condensate pump, and the condensate pump is configured to provide a head for the conveyance of the condensed water.

7. The condensate recovery system according to claim 1, wherein A second electric gate valve is arranged on the condensate pump bypass.

8. The condensate recovery system according to claim 4, wherein The control system is configured to control the opening and closing of the first electric gate valve of the condensate pump or the second electric gate valve of the condensate pump bypass.

9. The condensate recovery system according to claim 1, wherein A flow measurement device is arranged on the recovery pipeline, and the flow measurement device is configured to measure the flow rate of the condensed water in the recovery pipeline.

10. The condensate recovery system according to claim 1, wherein The circulating cooling system includes a thermal equipment cooling module, and the thermal equipment cooling module is connected to the pipeline outlets of the condensate pump and the condensate pump bypass, and is configured to receive the condensed water and cool the mechanical equipment in the compressed air energy storage power station.

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