Energy storage and stabilization system

Abstract

The invention discloses an energy storage and stabilization system, and relates to the technical field of new energy storage systems. The system comprises a make-up pump, a liquid-phase medium storage container, a pressure container and a turbine generator, the replenishment pump is suitable for being connected with renewable energy power generation equipment; the liquid outlet end of the liquid-phase medium storage container is communicated with the liquid inlet end of the replenishment pump, and the liquid-phase medium storage container is used for containing a liquid-phase medium; the pressure container is used for containing a gas phase medium, and the liquid inlet end of the pressure container communicates with the liquid outlet end of the make-up pump; the replenishment pump is used for pumping a liquid-phase medium to the pressure container so as to compress a gas-phase medium in the pressure container and absorb heat; the liquid inlet end of the turbine generator is communicated with the liquid outlet end of the pressure container, the liquid outlet end of the turbine generator is communicated with the liquid inlet end of the liquid-phase medium storage container, and the turbine generator is used for generating power and is suitable for being connected with external electric equipment or a power grid. The invention provides an energy storage system which is used for storing and recycling electric energy, greatly improves energy storage efficiency and is suitable for various geographical environments.

Description

Technical Field

[0001] The present invention relates to the technical field of new energy storage systems, and in particular to an energy storage and stabilization system. Background Art

[0002] As solar and wind power generation technologies continue to develop, the storage of electrical energy is becoming increasingly important. Traditional hydroelectric power plants are connected to reservoirs and can mostly generate electricity on demand, while large power plants such as natural gas, coal or nuclear power plants can at least generate constant power.

[0003] However, solar or wind power plants generate electricity completely independently, only when it is sunny or windy, and sometimes even when there is a lack of demand for electricity. Currently, a lot of solar or wind power is wasted because the grid cannot absorb such large amounts of electricity. Summary of the invention

[0004] The main purpose of the present invention is to provide an energy storage and stabilization system, aiming to store the electrical energy generated by solar and wind power generation.

[0005] To achieve the above objectives, the present invention provides an energy storage and stabilization system, comprising:

[0006] A make-up pump suitable for connection to renewable energy power generation equipment;

[0007] A liquid medium storage container, the liquid outlet of which is connected to the liquid inlet of the feed pump, and the liquid medium storage container is used to contain the liquid medium;

[0008] A pressure vessel, the pressure vessel is used to contain a gaseous medium, the liquid inlet end of the pressure vessel is connected to the liquid outlet end of the feed pump; the feed pump is used to pump the liquid medium into the pressure vessel to compress the gaseous medium therein and absorb the heat generated when the gaseous medium is compressed; and

[0009] A turbine generator, whose liquid inlet is connected to the liquid outlet of the pressure vessel, and whose liquid outlet is connected to the liquid inlet of the liquid medium storage container. The turbine generator is used for generating electricity and is suitable for being electrically connected to an external electrical device or a power grid.

[0010] Optionally, the energy storage and stabilization system further comprises an injection device, wherein the injection device is disposed in the pressure vessel and is connected to a liquid outlet of the replenishing pump, and the injection device is used to inject the liquid medium into the pressure vessel.

[0011] Optionally, the injection device has a plurality of injection ports, and the plurality of injection ports are evenly spaced and arranged along the circumferential direction of the inner circumferential wall of the pressure vessel.

[0012] Optionally, the injection device is located above an upper limit of the liquid level of the pressure vessel.

[0013] Optionally, the working pressure of the pressure vessel is set to make the temperature of the gas phase medium equal to the temperature of the liquid phase medium.

[0014] Optionally, the liquid medium storage container and / or the pressure container is a non-insulated structure.

[0015] Optionally, the energy storage and stabilization system further comprises a control unit, which is electrically connected to at least one of the feed pump, the liquid medium storage container, the pressure vessel and the turbine generator and is used to control the operation thereof.

[0016] Optionally, the energy storage and stabilization system further comprises a plurality of control valves electrically connected to the control unit, the control valves being arranged on pipelines at the feed pump and / or the turbine generator and being used to control the flow rate of the liquid flowing therethrough; and / or

[0017] The energy storage and stabilization system further comprises a plurality of pressure sensors electrically connected to the control unit, the pressure sensors being arranged on the pipelines at the feed pump and / or the turbine generator and used for detecting the pressure of the liquid flowing through; and / or

[0018] The energy storage and stabilization system further comprises a plurality of temperature sensors electrically connected to the control unit respectively, wherein the temperature sensors are arranged on the pipelines at the feed pump and / or the turbine generator and are used to detect the temperature of the liquid flowing therethrough.

[0019] Optionally, the gas phase medium is ethane, propane, butane or air.

[0020] Optionally, the liquid medium is a cooling liquid or a heat storage medium.

[0021] Optionally, the gas phase medium and the liquid phase medium are the same substance or different substances.

[0022] In the technical solution of the present invention, the energy storage and stabilization system includes a feed pump, a liquid medium storage container, a pressure container and a turbine generator; the feed pump is suitable for connecting to renewable energy power generation equipment; the liquid outlet of the liquid medium storage container is connected to the liquid inlet of the feed pump, and the liquid medium storage container is used to contain the liquid medium; the pressure container is used to contain the gaseous medium, and the liquid inlet of the pressure container is connected to the liquid outlet of the feed pump; the feed pump is used to pump the liquid medium into the pressure container to compress the gaseous medium therein and absorb the heat generated when the gaseous medium is compressed; the liquid inlet of the turbine generator is connected to the liquid outlet of the pressure container, and the liquid outlet of the turbine generator is connected to the liquid inlet of the liquid medium storage container, and the turbine generator is used to generate electricity and is suitable for being electrically connected to external electrical equipment or a power grid. It can be understood that the present invention proposes an energy storage system for storing and recovering electrical energy, especially the electrical energy produced by wind or solar power generation, which greatly improves the energy storage efficiency and is suitable for various geographical environments. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0024] Figure 1 It is a structural schematic diagram of an embodiment of the energy storage and stabilization system of the present invention.

[0025] Description of Figure Numbers:

[0026] 100. Energy storage and stabilization system; 200. Solar power generation device; 300. Wind turbine; 400. Power grid; 10. Supply pump; 20. Liquid medium storage container; 30. Pressure vessel; 40. Turbine generator; 50. Injection device.

[0027] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0028] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0029] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back, etc.) are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0030] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0031] In addition, the descriptions of "first", "second", etc. in the present invention are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the meaning of "and / or" appearing in the full text is to include three parallel solutions. Taking "A and / or B" as an example, it includes solution A, or solution B, or a solution that satisfies both A and B. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in this field to implement. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0032] The present invention proposes an energy storage and stabilization system, which is mainly suitable for short-term and medium-term storage of electric energy obtained from renewable energy, especially solar and wind power generation. Of course, it can also be used for traditional thermal power generation, etc., without limitation here.

[0033] Reference Figure 1In one embodiment of the present invention, the energy storage and stabilization system 100 includes a feed pump 10, a liquid medium storage container 20, a pressure container 30 and a turbine generator 40; the feed pump 10 is suitable for connecting to renewable energy power generation equipment such as a solar power generation device 200 and a wind turbine 300; the liquid outlet of the liquid medium storage container 20 is connected to the liquid inlet of the feed pump 10, and the liquid medium storage container 20 is used to contain the liquid medium; the pressure container 30 is used to contain the gaseous medium, and the liquid inlet of the pressure container 30 is connected to the liquid outlet of the feed pump 10; the feed pump 10 is used to pump the liquid medium into the pressure container 30 to compress the gaseous medium therein and absorb the heat generated when the gaseous medium is compressed; the liquid inlet of the turbine generator 40 is connected to the liquid outlet of the pressure container 30, and the liquid outlet of the turbine generator 40 is connected to the liquid inlet of the liquid medium storage container 20, and the turbine generator 40 is used to generate electricity and is suitable for being electrically connected to an external electrical device or a power grid 400.

[0034] Among them, the gas phase medium can be ethane, propane, butane or air. The liquid phase medium can be a coolant or a heat storage medium, preferably water, which is not limited here. In particular, the gas phase medium and liquid phase medium of the present invention can not only be different substances, but also the same substance, such as gas phase ethane-liquid phase ethane, gas phase propane-liquid phase propane, gas phase butane-liquid phase butane and other substances that can achieve gas-liquid phase change under appropriate temperature and pressure conditions, which are not limited here. When the same substance is used, the energy storage capacity can be greatly improved by combining the two processes of compressed gas energy storage and gas-liquid phase change energy storage.

[0035] In this embodiment, the supply pump 10 is a charge pump, which is electrically driven to convert the electrical energy transmitted by renewable energy power generation equipment such as the solar power generation device 200 and the wind turbine 300 into mechanical energy that drives the liquid medium to flow into the pressure vessel 30.

[0036] The gaseous medium in the pressure vessel 30 is compressed with the help of the liquid medium, and at the same time the liquid medium can also absorb the heat generated by the compression process. The present invention uses the liquid medium that extracts heat from the stored gaseous medium during compression as the compressed gaseous medium at the same time, thereby eliminating the separation between the compression or decompression of the gas as the storage medium and the heat transfer from or to the gas, thereby effectively improving the energy storage efficiency.

[0037] It can be understood that the present invention proposes an energy storage system for storing and recovering electrical energy, especially electrical energy produced by wind or solar power generation, which greatly improves the energy storage efficiency and is suitable for various geographical environments.

[0038] To further improve the energy storage efficiency, refer to Figure 1In one embodiment, the energy storage and stabilization system 100 may further include an injection device 50, which is disposed in the pressure vessel 30 and communicated with the liquid outlet of the supply pump 10, and is used to inject the liquid medium into the pressure vessel 30. Preferably, the injection device 50 is located above the upper limit of the liquid level of the pressure vessel 30, and the injection device 50 has a plurality of injection ports, which are evenly arranged at intervals along the inner circumferential wall of the pressure vessel 30, so as to more evenly inject the liquid into the pressure vessel 30, which helps to improve the compression and heat absorption effects.

[0039] It should be noted that the design or selection of the supply pump 10 should be considered to enable it to transport the coolant into the pressure vessel 30 and inject it to the target position in the pressure vessel 30 through the injection device 50.

[0040] The energy storage and stabilization system 100 of the present invention mainly has two stages during operation: a storage stage and a recovery stage.

[0041] During the storage phase, the electrical energy provided by the renewable energy power generation device is converted and stored. First, an operating pressure is generated in the gas-filled pressure vessel 30, and the operating pressure in the pressure vessel 30 will not be reduced in the further process, so the energy only needs to be consumed once for its production, in particular by filling the pressure vessel 30 with pressurized gas. The electrical energy from wind energy, solar energy or other renewable energy sources to be stored is available to the supply pump 10. Then, the supply pump 10 is controlled to deliver the liquid medium from the liquid medium storage container 20 to the injection device 50 located in the pressure vessel 30. The liquid medium cools the gas in the pressure vessel 30, and the pressure of the gas increases at the same time because more and more volume in the pressure vessel 30 is occupied by the coolant. The pressure therefore rises, but the use of steam offsets the process of condensing the steam by cooling at the same time, so the pressure increase is much lower than when the steam is compressed without cooling. The injection device 50 is arranged above the maximum liquid level in the pressure vessel 30 so that the injected liquid medium flows through a trickle path as large as possible before reaching the bottom of the pressure vessel 30. It should be noted that the use of steam means that the liquid and gas phase media use the same substance (for example, ethane, boiling point -88°C; propane, boiling point -42°C; butane, boiling point -0.5°C; or other media). During the pressure change process, not only the pressure change of the gas phase can store energy, but the phase change from gas phase to liquid phase can also store additional energy, thereby increasing the capacity of the energy storage medium.

[0042] During the recovery phase, the pressurized liquid medium is supplied from the pressure vessel 30 to the downstream turbine generator 40, which is driven by the pressure vessel 30 and generates electricity. In order to recover the stored energy, the electric energy generated by the turbine generator 40 can be transmitted to a place where electricity is needed or directly to an external power-consuming device through the power grid 400. In this embodiment, water is used as the liquid medium, which has high heat capacity, low cost and high availability.

[0043] Furthermore, during the recovery phase, it should be ensured that a small amount of liquid phase medium always remains at the bottom of the pressure vessel 30 to prevent gas from leaking from the pressure vessel 30 into the turbine generator 40 .

[0044] In one embodiment, the liquid medium storage container 20 and / or the pressure container 30 are preferably non-insulated structures, so the ambient temperature, especially the temperature of the liquid medium, should be considered. To this end, the working pressure in the pressure container 30 is preferably set so that the temperature of the gas phase medium is approximately equal to the temperature of the liquid phase medium. The pressure setting can be achieved by pumping or feeding the gas phase medium into the pressure container 30.

[0045] In this embodiment, the initial working pressure in the pressure vessel 30 is predetermined according to the selected gas. On the one hand, as much liquid medium as possible can be input to store more energy; on the other hand, the liquid medium recovers the stored energy, and the gas pressure is basically completely pressed out of the pressure vessel 30, which greatly improves the power generation efficiency.

[0046] In order to further improve energy utilization and realize semi-automatic or full-automatic energy storage and release, refer to Figure 1 In one embodiment, the energy storage and stabilization system 100 may further include a control unit, a pressure sensor and a temperature sensor. The control unit is electrically connected to at least one of the feed pump 10, the liquid medium storage container 20, the pressure container 30 and the turbine generator 40 and is used to control the operation thereof. The control valve is arranged on the pipeline at the feed pump 10 and / or the turbine generator 40 and is used to control the flow rate of the liquid flowing through. A plurality of pressure sensors are electrically connected to the control unit respectively. The pressure sensors are arranged on the pipeline at the feed pump 10 and / or the turbine generator 40 and are used to detect the pressure of the liquid flowing through. A plurality of temperature sensors are electrically connected to the control unit respectively. The temperature sensors are arranged on the pipeline at the feed pump 10 and / or the turbine generator 40 and are used to detect the temperature of the liquid flowing through.

[0047] In this embodiment, the control unit may be a single chip microcomputer, a DSP, a FPGA, etc., but is not limited here.

[0048] In addition, in this embodiment, the energy storage and stabilization system 100 may also be provided with a wireless communication module to establish communication with a control terminal such as a computer, thereby realizing remote real-time monitoring, which can greatly improve work efficiency.

[0049] The above descriptions are only optional embodiments of the present invention, and are not intended to limit the patent scope of the present invention. All equivalent structural changes made using the contents of the present invention's specification and drawings, or directly / indirectly applied in other related technical fields, are included in the patent protection scope of the present invention.

Claims

1. An energy storage and stabilization system, characterized in that: include: A make-up pump suitable for connection to renewable energy power generation equipment; A liquid medium storage container, the liquid outlet of which is connected to the liquid inlet of the feed pump, and the liquid medium storage container is used to contain the liquid medium; A pressure vessel, the pressure vessel is used to contain a gaseous medium, the liquid inlet end of the pressure vessel is connected to the liquid outlet end of the feed pump; the feed pump is used to pump the liquid medium into the pressure vessel to compress the gaseous medium in the pressure vessel and absorb the heat generated when compressing the gaseous medium; as well as A turbine generator, whose liquid inlet is connected to the liquid outlet of the pressure vessel, and whose liquid outlet is connected to the liquid inlet of the liquid medium storage container. The turbine generator is used for generating electricity and is suitable for being electrically connected to an external electrical device or a power grid.

2. The energy storage and stabilization system according to claim 1, characterized in that: The energy storage and stabilization system further comprises an injection device, which is disposed in the pressure vessel and communicated with the liquid outlet of the supply pump, and is used for injecting the liquid medium into the pressure vessel.

3. The energy storage and stabilization system according to claim 2, characterized in that: The injection device has a plurality of injection ports, and the plurality of injection ports are evenly spaced and arranged along the inner peripheral wall of the pressure container in the circumferential direction.

4. The energy storage and stabilization system according to claim 2, characterized in that: The injection device is located above the upper limit of the liquid level of the pressure container.

5. The energy storage and stabilization system according to claim 1, characterized in that: The working pressure of the pressure vessel is set to make the temperature of the gas phase medium equal to the temperature of the liquid phase medium.

6. The energy storage and stabilization system according to claim 1, characterized in that: The liquid medium storage container and / or the pressure container is a non-insulated structure.

7. The energy storage and stabilization system according to claim 1, characterized in that: The energy storage and stabilization system further comprises a control unit, which is electrically connected to at least one of the feed pump, the liquid medium storage container, the pressure container and the turbine generator and is used to control the operation thereof.

8. The energy storage and stabilization system according to claim 7, characterized in that: The energy storage and stabilization system further comprises a plurality of control valves electrically connected to the control unit, the control valves being arranged on the pipelines at the feed pump and / or the turbine generator and being used to control the flow rate of the liquid flowing therethrough; and / or The energy storage and stabilization system further comprises a plurality of pressure sensors electrically connected to the control unit, the pressure sensors being arranged on the pipelines at the feed pump and / or the turbine generator and used for detecting the pressure of the liquid flowing through; and / or The energy storage and stabilization system further comprises a plurality of temperature sensors electrically connected to the control unit respectively, wherein the temperature sensors are arranged on the pipelines at the feed pump and / or the turbine generator and are used to detect the temperature of the liquid flowing therethrough.

9. The energy storage and stabilization system according to claim 1, characterized in that: The gas phase medium is ethane, propane, butane or air; and / or The liquid medium is a cooling liquid or a heat storage medium.

10. The energy storage and stabilization system according to claim 1, characterized in that: The gas phase medium and the liquid phase medium are the same substance or different substances.

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