A compressed air energy storage power plant staggered water cooling system and method

Abstract

The application provides a compressed air energy storage power station staggered time water cooling system and method, an outlet pipeline of a cold water tank is divided into two routes, a first pipeline is connected with a cold water pump and an air cooler in sequence and then connected with an inlet of a hot water tank, a second pipeline is connected with the cold water pump and a cold water bypass in sequence and then connected with the inlet of the hot water tank; an outlet pipeline of the hot water tank is divided into three routes, a third pipeline is connected with a hot water pump, an air heater and a warm water main route in sequence and then connected with an inlet of the cold water tank, a fourth pipeline is connected with the hot water pump, the air heater, a warm water bypass and a cooling water equipment in sequence and then connected with the inlet of the cold water tank, and a fifth pipeline is connected with a cooling circulating pump and the cooling water equipment in sequence and then connected with the inlet of the cold water tank; the application can reduce the size of the cooling equipment, solve the problems of high land occupation, investment and environmental requirements, reduce the amount of power consumption during power generation, and improve the income ability of the power station.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of compressed air energy storage, in particular to a compressed air energy storage power station staggered time water cooling system and method. BACKGROUND

[0002] The statements in this section merely provide background technology related to the present application and do not necessarily constitute prior art.

[0003] Compressed air energy storage (CAES) is a low-cost and large-capacity energy storage technology that stores electrical energy by compressing air, which can bear the functions of "peak load shifting", "black start of power grid", and smoothing the volatility of intermittent renewable energy. According to the way of handling compression heat and expansion preheating, common compressed air energy storage technologies can be divided into external heat source type and adiabatic type. In the external heat source type, the compression heat is taken away by the cooling medium, and the expansion preheating uses external heat source, which has a low overall efficiency; in the adiabatic type, the compression heat is recovered by the heat storage medium for the preheating of the expander, which has a high overall efficiency and is more commonly used.

[0004] During the power generation peak and low electricity consumption, the excess power of the power grid has no place to be consumed, and the compressed air energy storage power station can receive the power of the power grid, use the motor to drive the air compressor to compress the air in the environment into high-pressure air and store it for standby; during the power generation valley and high electricity consumption, the power grid needs power supplement, and the compressed air energy storage power station uses the stored high-pressure air to drive the expander, the expander drives the generator to generate electricity for the power grid, and the air at the outlet of the expander is discharged into the atmosphere.

[0005] Although the adiabatic compressed air energy storage, especially the adiabatic compressed air energy storage with water as the heat storage medium, has been widely used in engineering, there are still some problems as follows:

[0006] Compared with non-new energy storage methods, the unit kilowatt cost of the compressed air energy storage power station is relatively high; as the installed capacity increases, the scale of the supporting cooling system becomes larger, the land occupation and investment also increase, and the requirement for the surrounding cold source of the site also increases; when the energy storage power station generates electricity, many electrical equipment in the power station need to be operated at the same time, which affects the power generation efficiency and reduces the overall income level of the power station. SUMMARY

[0007] In order to solve the problems of the prior art, the present application provides a compressed air energy storage power station staggered time water cooling system and method, which can fully utilize the intermittent operation characteristics of the compressed air energy storage power station, exchange space with time, prolong the operation time of the cooling system, reduce the size of the cooling equipment, solve the problems of high land occupation, investment and environmental requirements, and reduce the amount of power consumption during power generation, thereby improving the income ability of the power station.

[0008] To achieve the above objectives, the present invention adopts the following technical solution:

[0009] The first aspect of the present invention provides a timed water cooling system for a compressed air energy storage power station.

[0010] A time-sharing water cooling system for a compressed air energy storage power station includes: a cold water tank, a cold water pump, an air cooler, a cold water bypass, a hot water tank, a hot water pump, an air heater, a cooling circulation pump, a cooling water device, a warm water main line, and a warm water bypass;

[0011] The cold water tank outlet pipe is divided into two lines. The first line connects to the cold water pump and the air cooler in sequence, and then connects to the hot water tank inlet. The second line connects to the cold water pump and the cold water bypass in sequence, and then connects to the hot water tank inlet.

[0012] The hot water tank outlet pipe is divided into three lines. The third line connects to the hot water pump, air heater, and warm water main line in sequence, and then connects to the cold water tank inlet. The fourth line connects to the hot water pump, air heater, warm water bypass, and cooling water equipment in sequence, and then connects to the cold water tank inlet. The fifth line connects to the cooling circulation pump and cooling water equipment in sequence, and then connects to the cold water tank inlet.

[0013] As a further limitation of the first aspect of the invention, the air filtration device is connected to the compressor, the compressor is connected to the gas inlet of the air cooler, and the gas outlet of the air cooler is connected to the inlet of the high-pressure air storage tank.

[0014] As a further limitation of the first aspect of the invention, the outlet of the high-pressure air storage tank is connected to the gas inlet of the air heater, and the gas outlet of the air heater is connected to the expander.

[0015] A second aspect of the present invention provides a method for staggered water cooling in a compressed air energy storage power station.

[0016] A method for staggered water cooling of a compressed air energy storage power station, utilizing the staggered water cooling system for a compressed air energy storage power station described in the first aspect of the present invention;

[0017] For energy storage periods, including:

[0018] The system consists of a cold water tank, a cold water pump, an air cooler, and a hot water tank. The room temperature water in the cold water tank is pressurized by the cold water pump through the first pipe at the outlet of the cold water tank and flows through the air cooler to remove the heat from the high temperature and high pressure air at the compressor outlet. The room temperature water is heated and pressurized to become high pressure hot water and finally enters the hot water tank for storage, ready for use during power generation.

[0019] For the period following energy storage, including:

[0020] The compressed air energy storage power station's off-peak water cooling system does not operate and therefore does not consume electricity.

[0021] As a further limitation of the second aspect of the application, for the power generation period, comprising:

[0022] The hot water tank, the hot water pump, the air heater, the third pipeline, the cold water tank participate in work, the hot water in the hot water tank goes out of the hot water tank through the third pipeline, is pressurized through the hot water pump, flows through the air heater, uses the heat to heat the normal temperature high pressure air that is about to enter the expander; the hot water cooled by air becomes warm water, and finally enters the cold water tank for storage, during which the expander is matched with auxiliary machines and consumes power;

[0023] For the period after power generation, comprising:

[0024] The cold water tank, the cold water pump, the second pipeline, the hot water tank, the cooling circulating pump and the cooling device participate in work, the warm water in the cold water tank goes out of the cold water tank through the second pipeline, is transported and stored to the hot water tank through the cold water pump; the warm water in the hot water tank goes out of the hot water tank through the fifth pipeline, is transported by the cooling circulating pump, flows through the cooling device to be sufficiently cooled to normal temperature, and finally enters the cold water tank for storage.

[0025] The third aspect of the application provides a compressed air energy storage power station staggered time water cooling system.

[0026] A compressed air energy storage power station staggered time water cooling system, comprising: a cold water tank, a cold water pump, an air cooler, a cold water bypass, a hot water tank, a hot water pump, an air heater, a cooling main line, a cooling device, a warm water main line and a warm water bypass;

[0027] The cold water tank outlet pipeline is divided into two routes, the first pipeline is connected with the cold water pump and the air cooler in sequence, and then connected with the hot water tank inlet, the second pipeline is connected with the cold water pump and the cold water bypass in sequence, and then connected with the hot water tank inlet;

[0028] The hot water tank outlet pipeline is divided into three routes, the third pipeline is connected with the hot water pump, the air heater and the warm water main line in sequence, and then connected with the cold water tank inlet; the fourth pipeline is connected with the hot water pump, the air heater, the warm water bypass and the cooling device in sequence, and then connected with the cold water tank inlet; the fifth pipeline is connected with the cooling main line and the cooling device in sequence, and then connected with the cold water tank inlet.

[0029] As a further limitation of the third aspect of the application, a filter device for filtering air is connected with the compressor, the compressor is in communication with the gas inlet of the air cooler, and the gas outlet of the air cooler is in communication with the inlet of the high pressure air storage tank.

[0030] As a further limitation of the third aspect of the application, the outlet of the high pressure air storage tank is in communication with the gas inlet of the air heater, and the gas outlet of the air heater is in communication with the expander.

[0031] The fourth aspect of the application provides a compressed air energy storage power station staggered time water cooling method.

[0032] A compressed air energy storage power station staggered time water cooling method utilizes the compressed air energy storage power station staggered time water cooling system of the third aspect of the application;

[0033] For the energy storage period, comprising:

[0034] The cold water tank, the cold water pump, the air cooler and the hot water tank participate in work, the normal temperature water in the cold water tank is pressurized by the cold water pump through the first pipeline of the cold water tank outlet, flows through the air cooler, and the heat of the high temperature and high pressure air at the compressor outlet is taken away, the normal temperature water becomes high pressure hot water by temperature rising and pressure rising, and finally enters the hot water tank for storage for use in the power generation period;

[0035] For the energy storage period, comprising:

[0036] The compressed air energy storage power station staggered time water cooling system does not work, and no power is consumed.

[0037] As a further limitation of the fourth aspect of the application, for the power generation period, comprising:

[0038] The hot water tank, the hot water pump, the air heater, the third pipeline, the cold water tank participate in work, the hot water in the hot water tank goes through the third pipeline of the hot water tank outlet, is pressurized by the hot water pump, flows through the air heater, and the normal temperature and high pressure air about to enter the expander is heated by using its own heat; the hot water cooled by the air becomes warm water, and finally enters the cold water tank for storage, during which the expander is matched with auxiliary machines and consumes power;

[0039] For the power generation period, comprising:

[0040] The cold water tank, the cold water pump, the second pipeline, the hot water tank, the hot water pump, the cold water main line and the cold water equipment participate in work, the warm water in the cold water tank goes through the second pipeline of the cold water tank outlet, is delivered by the cold water pump and is stored in the hot water tank; the warm water in the hot water tank goes through the fifth pipeline of the hot water tank outlet, is delivered by the hot water pump, flows through the cold water main line and the cold water equipment, is fully cooled to normal temperature, and finally enters the cold water tank for storage.

[0041] Compared with the prior art, the application has the following beneficial effects:

[0042] 1、The application innovatively proposes a compressed air energy storage power station staggered time water cooling system and method, which can fully utilize the intermittent operation characteristics of the compressed air energy storage power station, exchange space for time, lengthen the operation time of the cooling system, reduce the size of the cooling equipment selection, solve the problems of high land occupation, investment and environmental requirements, reduce the amount of power generation, improve the power station revenue capacity.

[0043] 2, The compressed air energy storage power station staggered time water cooling system and method are innovatively provided, the cooling system does not consume power during the power generation period, and the original power consumption is distributed to the period after power generation, because the electricity fee during the power generation period is higher than that during the period after power generation, the overall power consumption of the power station is reduced, and in addition, because the cooling system operates for a longer time, the same cooling capacity is completed, the cooling equipment can be selected to be smaller, and the equipment investment is lower.

[0044] 3, The compressed air energy storage power station staggered time water cooling system and method are innovatively provided, the cooling system operates in the period after power generation, can reduce the overall power consumption, thereby reducing the operating cost, and the smaller cooling equipment has smaller land occupation and lower requirement for external cold source.

[0045] The advantages of the additional aspects of the application will be partially given in the following description, partially become obvious from the following description, or be known by the practice of the application. BRIEF DESCRIPTION OF DRAWINGS

[0046] The drawings accompanying the specification of the application form a part of the application and serve to provide further understanding of the application, the illustrative embodiments of the application and their descriptions serve to explain the application, and do not constitute improper limitations on the application.

[0047] Figure 1 The structure schematic view of the compressed air energy storage power station staggered time water cooling system provided for the embodiment 1 of the application is shown in the figure;

[0048] Figure 2 The operation electric power curve and electricity price relationship schematic view of the certain typical design pressure 4 release 4 compressed air energy storage power station provided for the embodiment 1 of the application is shown in the figure;

[0049] Figure 3 The auxiliary machine operation electric power consumption schematic view of the certain typical design pressure 4 release 4 compressed air energy storage power station provided for the embodiment 1 of the application is shown in the figure;

[0050] Figure 4 The operation electric power consumption schematic view provided for the embodiment 1 of the application is shown in the figure;

[0051] Figure 5 The structure schematic view of the compressed air energy storage power station staggered time water cooling system provided for the embodiment 2 of the application is shown in the figure;

[0052] 1-cool water tank, 2-cool water pump, 3-air cooler, 4-cool water bypass, 5-hot water tank, 6-hot water pump, 7-air heater, 8-cooling circulating water pump, 9-cooling equipment, 10-warm water main road, 11-warm water bypass, 12-filter device, 13-electric motor, 14-compressor, 15-high pressure air storage tank, 16-expander, 17-generator, 18-cooling main road. DETAILED DESCRIPTION

[0053] The application will be further described below in connection with the drawings and embodiments.

[0054] It should be noted that the following detailed description is exemplary in nature and is intended to provide further description of the application. Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.

[0055] It is also important to note that the terms used herein are not intended to limit the particular embodiments of the present application which can be practiced with the examples of the present application. As used herein, unless expressly stated to the contrary, the singular also comprises the plural. Further, it is to be understood that the use of a term such as "comprise", "comprises", "comprising", "include", "includes", "including", or "has", "have", "having" or variants thereof, is not intended to exclude the presence of other elements or steps.

[0056] The embodiments in the present application and the features in the embodiments can be combined with each other without conflict.

[0057] Embodiment 1:

[0058] As shown in the figure, the embodiment 1 of the present application provides a compressed air energy storage power station staggered time water cooling system, comprising:

[0059] a cold water tank 1, a cold water pump 2, an air cooler 3, a cold water bypass 4, a hot water tank 5, a hot water pump 6, an air heater 7, a cooling circulating pump 8, a cooling device 9, a warm water main line 10 and a warm water bypass 11;

[0060] The outlet pipeline of the cold water tank 1 is divided into two routes: the main line (i.e. the first pipeline) is connected with the cold water pump 2 and the air cooler 3 in turn, and finally connected with the inlet of the hot water tank 5; the branch line (i.e. the second pipeline) is connected with the cold water pump 2 and the cold water bypass 4 in turn, and finally connected with the inlet of the hot water tank 5.

[0061] The outlet pipeline of the hot water tank 5 is divided into three routes: the main line (i.e. the third pipeline) is connected with the hot water pump 6, the air heater 7 and the warm water main line 10 in turn, and finally connected with the inlet of the cold water tank 1; the first branch line (i.e. the fourth pipeline) is connected with the hot water pump 6, the air heater 7, the warm water bypass 11 and the cooling device 9 in turn, and finally connected with the inlet of the cold water tank 1; the second branch line (i.e. the fifth pipeline) is connected with the cooling circulating pump 8 and the cooling device 9 in turn, and finally connected with the inlet of the cold water tank 1.

[0062] A filter device 12 for filtering air is connected with a compressor 14, the compressor 14 is communicated with the gas inlet of the air cooler 3, the gas outlet of the air cooler 3 is communicated with the inlet of a high-pressure air storage tank 15, and the compressor 14 is driven by an electric motor 13;

[0063] The outlet of the high-pressure air storage tank 15 is connected to the gas inlet of the air heater 7, the gas outlet of the air heater 7 is connected to the expander 16, and the expander 16 is connected to the generator 17.

[0064] When the power station stores energy, the cold water tank 1, cold water pump 2, air cooler 3, and hot water tank 5 of the thermal storage module are involved in the operation. The room temperature cold water in the cold water tank 1 passes through the above-mentioned equipment in sequence and is finally stored in the hot water tank 5 in the state of hot water.

[0065] When the power station generates electricity, the hot water tank 5, hot water pump 6, air heater 7, warm water main line 10, and cold water tank 1 of the thermal storage module are engaged in operation. The hot water in the hot water tank 5 passes through the above-mentioned equipment in sequence. Since it is not fully cooled by the cooling water equipment 9, it is finally stored in the cold water tank 1 in a medium-temperature state.

[0066] After the power plant finishes generating electricity, the medium-temperature water in the cold water tank 1 is first transferred to the hot water tank 5. That is, driven by the cold water pump 2, it flows through the cold water bypass 4 to the hot water tank 5, and then undergoes sufficient cooling treatment. That is, the medium-temperature water in the hot water tank 5 is driven by the cooling circulating water pump 8 and cooled to room temperature by the cooling water equipment 9, and finally stored in the cold water tank 1 as room temperature cold water.

[0067] like Figure 2 As shown, taking the typical 4-pressurization, 4-release compressed air power plant operation mode as an example, the power plant first stores energy for 4 hours when the electricity price is low, waits for 8 hours, and then generates electricity for 4 hours when the electricity price is high. That is, the power plant has a total of 4 periods in each 24-hour cycle: energy storage period, energy storage period, power generation period, and power generation period.

[0068] During the energy storage period, cold water tank 1, cold water pump 2, air cooler 3, and hot water tank 5 are in operation. The room temperature water in cold water tank 1 flows through the main outlet pipeline of cold water tank 1 (i.e., the first pipeline), which is pressurized by cold water pump 2 and flows through air cooler 3, carrying away the heat of the high temperature and high pressure air at the outlet of compressor 14. The room temperature water is heated and pressurized into high pressure hot water and finally enters hot water tank 5 for storage, to be used during the power generation period. During this period, compressor 14 and its auxiliary equipment work and consume electricity.

[0069] During the period after energy storage, the system described in this invention does not work, and none of the devices in the system consume electricity during this period.

[0070] During the power generation period, the hot water tank 5, hot water pump 6, air heater 7, warm water main line 10, and cold water tank 1 of the system described in this invention are engaged in operation. The hot water in the hot water tank 5 flows through the hot water tank 5 outlet main line (i.e., the third line), that is, it is pressurized by the hot water pump 6 and flows through the air heater 7, using its own heat to heat the room temperature high pressure air that is about to enter the expander 16. The hot water cooled by the air becomes warm water and finally enters the cold water tank 1 for storage. During this period, the expander 16 works with auxiliary equipment and consumes electricity.

[0071] After power generation period, the system of the present application works with cold water tank 1, cold water pump 2, cold water bypass 4, hot water tank 5, cooling circulating pump 8, cooling device 9, the warm water in cold water tank 1 goes through the cold water tank 1 outlet pipeline branch (i.e. second pipeline), i.e. is transported to hot water tank 5 through cold water pump 2 and is dumped, and then the warm water in hot water tank 5 goes through the hot water tank 5 outlet pipeline second branch (i.e. fifth pipeline), i.e. the warm water is transported through cooling circulating pump 8, flows through cooling device 9 and is fully cooled to normal temperature, and finally enters cold water tank 1 for storage;

[0072] The system of the present application can shorten the cooling time according to actual operation needs, i.e. during the power generation period, the main path (i.e. third pipeline) and the first bypass (i.e. fourth pipeline) are opened at the same time, most of the warm water does not cool through the main path (i.e. third pipeline), and a small amount of warm water is fully cooled through cooling device 9 through the first bypass (i.e. fourth pipeline), so that the overall temperature of the warm water is moderately reduced, and the cooling time required during the post-power generation period is reduced.

[0073] As shown in Figure 3 and Figure 4 In the system of the present application, the cooling system no longer consumes electricity during the power generation period, and the original electricity consumption is distributed to the post-power generation period; because the electricity cost during the power generation period is higher than that during the post-power generation period, the overall electricity cost of the power station will be reduced, and in addition, because the cooling system operates for a longer time, the same cooling capacity can be completed with smaller cooling equipment.

[0074] Example 2

[0075] As shown in Figure 5 The present application provides a compressed air energy storage power station staggered time water cooling system, which comprises:

[0076] cold water tank 1, cold water pump 2, air cooler 3, cold water bypass 4, hot water tank 5, hot water pump 6, air heater 7, cooling device 9, warm water main path 10, warm water bypass 11 and cooling main path 18;

[0077] The outlet pipeline of cold water tank 1 is divided into two paths: the main path (i.e. first pipeline) is connected with cold water pump 2 and air cooler 3 in sequence and is finally connected with the inlet of hot water tank 5; the branch path (i.e. second pipeline) is connected with cold water pump 2 and cold water bypass 4 in sequence and is finally connected with the inlet of hot water tank 5;

[0078] The outlet pipeline of hot water tank 5 is divided into three paths: the main path (i.e. third pipeline) is connected with hot water pump 6, air heater 7 and warm water main path 10 in sequence and is finally connected with the inlet of cold water tank 1; the first branch path (i.e. fourth pipeline) is connected with hot water pump 6, air heater 7, warm water bypass 11 and cooling device 9 in sequence and is finally connected with the inlet of cold water tank 1; the second branch path (i.e. fifth pipeline) is connected with hot water pump 6, cooling main path 18 and cooling device 9 in sequence and is finally connected with the inlet of cold water tank 1.

[0079] The filtering device 12 for filtering air is connected with the compressor 14, the compressor 14 is communicated with the gas inlet of the air cooler 3, the gas outlet of the air cooler 3 is communicated with the inlet of the high-pressure air storage tank 15, and the compressor 14 is driven by the motor 13;

[0080] The outlet of the high-pressure air storage tank 15 is communicated with the gas inlet of the air heater 7, the gas outlet of the air heater 7 is communicated with the expander 16, and the expander 16 is connected with the generator 17.

[0081] When the power station stores energy, the cold water tank 1, the cold water pump 2, the air cooler 3 and the hot water tank 5 of the heat storage module work, and the normal-temperature cold water in the cold water tank 1 passes through the above equipment in turn and is finally stored in the hot water tank 5 in the form of hot water.

[0082] When the power station generates electricity, the hot water tank 5, the hot water pump 6, the air heater 7, the warm water main line 10 and the cold water tank 1 of the heat storage module work, and the hot water in the hot water tank 5 passes through the above equipment in turn and is finally stored in the cold water tank 1 in the form of medium-temperature warm water without being fully cooled by the cold water equipment 9.

[0083] After the power station stops generating electricity, the medium-temperature warm water in the cold water tank 1 is first transferred to the hot water tank 5, that is, driven by the cold water pump 2, passes through the cold water bypass 4 to the hot water tank 5, and then is fully cooled, that is, the medium-temperature warm water in the hot water tank 5 is driven by the hot water pump 6, cooled by the cold water equipment 9 to normal temperature, and finally stored in the cold water tank 1 in the form of normal-temperature cold water.

[0084] Taking a typical 4-4 compressed air power station operation mode as an example, the power station stores energy for 4 hours at the electricity price low valley, waits for 8 hours and then generates electricity for 4 hours at the electricity price peak, that is, the power station includes four time periods in a 24-hour cycle, that is, the energy storage time period, the time period after energy storage, the electricity generation time period and the time period after electricity generation.

[0085] In the energy storage time period, the cold water tank 1, the cold water pump 2, the air cooler 3 and the hot water tank 5 work, the normal-temperature water in the cold water tank 1 passes through the outlet pipeline main line (that is, the first pipeline) of the cold water tank 1, that is, is pressurized by the cold water pump 2, flows through the air cooler 3 and takes away the heat of the high-temperature and high-pressure air at the outlet of the compressor 14, the normal-temperature water is changed into high-pressure hot water by being heated and pressurized, and finally is stored in the hot water tank 5 for use in the electricity generation time period, during which the compressor 14 and the auxiliary machine of the compressor 14 work and consume electric power.

[0086] In the time period after energy storage, the system does not work, and all the systems do not consume electric power.

[0087] During the power generation period, the system of the present application works with the hot water tank 5, the hot water pump 6, the air heater 7, the warm water main line 10, and the cold water tank 1, the hot water in the hot water tank 5 goes through the outlet pipeline main line (i.e. the third pipeline) of the hot water tank 5, i.e. is pressurized by the hot water pump 6, flows through the air heater 7, and uses its own heat to heat the normal temperature high pressure air that will enter the expander 16; the hot water cooled by air becomes warm water, and finally enters the cold water tank 1 for storage, during which the expander 16 works with the auxiliary machine and consumes power.

[0088] After the power generation period, the system of the present application works with the cold water tank 1, the cold water pump 2, the cold water bypass 4, the hot water tank 5, the hot water pump 6, the cool water main line 18, and the cool water equipment 9, the warm water in the cold water tank 1 goes through the outlet pipeline branch (i.e. the second pipeline) of the cold water tank 1, i.e. is delivered to the hot water tank 5 by the cold water pump 2, and then the warm water in the hot water tank 5 goes through the outlet pipeline second branch (i.e. the fifth pipeline) of the hot water tank 5, i.e. the warm water is delivered by the hot water pump 6, passes through the cool water main line 18, flows through the cool water equipment 9 to be cooled to normal temperature, and finally enters the cold water tank 1 for storage;

[0089] The system of the present application can shorten the cooling time according to the actual operation needs, i.e. during the power generation period, the main line (i.e. the third pipeline) and the first bypass (i.e. the fourth pipeline) are opened at the same time, most of the warm water goes through the main line (i.e. the third pipeline) without cooling, and a small amount of warm water goes through the first bypass (i.e. the fourth pipeline) to be fully cooled by the cool water equipment 9, so that the overall temperature of the warm water is moderately reduced, and the cooling requirement during the post-power generation period is reduced.

[0090] In the system of the present application, the cooling system no longer consumes power during the power generation period, and the original power consumption is distributed to the post-power generation period, because the electricity fee during the power generation period is higher than that during the post-power generation period, the overall power consumption of the power station will be reduced, and in addition, because the cooling system runs for a longer time, the same cooling capacity can be completed with smaller cooling equipment.

[0091] The embodiment can save the investment of the cooling circulating water pump equipment, and the system is simpler; but the hot water pump 6 itself is selected to have a larger flow than the cooling circulating water pump, and the equipment has a low running efficiency.

[0092] The above only describes the preferred embodiments of the present application, and is not used to limit the present application, and the present application can have various changes and variations for those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A time-shifted water cooling system for a compressed air energy storage power station, characterized in that, include: Cold water tank, cold water pump, air cooler, cold water bypass, hot water tank, hot water pump, air heater, cooling circulation pump, cold water equipment, warm water main line and warm water bypass; The cold water tank outlet pipe is divided into two lines. The first line connects to the cold water pump and the air cooler in sequence, and then connects to the hot water tank inlet. The second line connects to the cold water pump and the cold water bypass in sequence, and then connects to the hot water tank inlet. The hot water tank outlet pipe is divided into three lines. The third line connects to the hot water pump, air heater, and warm water main line in sequence, and then connects to the cold water tank inlet. The fourth line connects to the hot water pump, air heater, warm water bypass, and cooling water equipment in sequence, and then connects to the cold water tank inlet. The fifth line connects to the cooling circulation pump and cooling water equipment in sequence, and then connects to the cold water tank inlet. Alternatively, the fifth line connects to the cold water main line and cooling water equipment in sequence, and then connects to the cold water tank inlet. The method of the time-sharing water cooling system of the compressed air energy storage power station is as follows: For energy storage periods, including: The system consists of a cold water tank, a cold water pump, an air cooler, and a hot water tank. The room temperature water in the cold water tank is pressurized by the cold water pump through the first pipe at the outlet of the cold water tank and flows through the air cooler to remove the heat from the high temperature and high pressure air at the outlet of the compressor. The room temperature water is heated and pressurized to become high pressure hot water and finally enters the hot water tank for storage, ready for use during power generation. For the period following energy storage, including: The compressed air energy storage power station's off-peak water cooling system does not operate and therefore does not consume electricity.

2. The time-sharing water cooling system for compressed air energy storage power stations as described in claim 1, characterized in that, The air filter is connected to the compressor, the compressor is connected to the gas inlet of the air cooler, and the gas outlet of the air cooler is connected to the inlet of the high-pressure air storage tank.

3. The time-sharing water cooling system for compressed air energy storage power stations as described in claim 2, characterized in that, The outlet of the high-pressure air storage tank is connected to the gas inlet of the air heater, and the gas outlet of the air heater is connected to the expander.

4. A method for staggered water cooling in a compressed air energy storage power station, characterized in that, The compressed air energy storage power station uses a staggered water cooling system as described in any one of claims 1-3.

5. The method for staggered water cooling of a compressed air energy storage power station as described in claim 4, characterized in that, For power generation periods, including: The hot water tank, hot water pump, air heater, third pipeline, and cold water tank are involved in the operation. The hot water in the hot water tank flows through the third pipeline at the outlet of the hot water tank, is pressurized by the hot water pump, and flows through the air heater, using its own heat to heat the room temperature high-pressure air that is about to enter the expander. The hot water is cooled by the air and becomes warm water, and finally enters the cold water tank for storage. During this process, the expander and its auxiliary equipment work and consume electricity. For the period following power generation, including: The system consists of a cold water tank, a cold water pump, a second pipeline, a hot water tank, a cooling circulation pump, and a cooling water system. Warm water from the cold water tank flows through the second pipeline at the cold water tank outlet and is then transferred to the hot water tank by the cold water pump. Warm water from the hot water tank flows through the fifth pipeline at the hot water tank outlet and is then transported by the cooling circulation pump. After being cooled to room temperature by the cooling water system, the warm water finally enters the cold water tank for storage.

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