阅读说明：本技术 一种水力恒压式双效压缩空气储能系统 (Hydraulic constant-pressure double-effect compressed air energy storage system ) 是由 梅生伟 李智 李青松 李静宜 张学林 薛小代 陈来军 张通 李凯 于 2018-06-08 设计创作，主要内容包括：本发明涉及储能技术领域,尤其涉及一种水力恒压式双效压缩空气储能系统。该水力恒压式双效压缩空气储能系统包括空气储能单元和水力储能单元,所述空气储能单元包括空气压缩机组、空气透平机组和储气库,所述水力储能单元包括高位水源以及与所述高位水源连接的水轮机组。本发明所述的水力恒压式双效压缩空气储能系统,通过高位水源提供重力柱,能够使储气库在放气释能过程中维持恒定的供气压力,使得系统在放气释能过程中更加稳定,并且既可进行双效储能,也可根据实际需求单独进行压缩空气储能或抽水蓄能,系统灵活性和适应性更强,并能够通过电力存储的方式提供电网调峰等服务。(The invention relates to the technical field of energy storage, in particular to a hydraulic constant-pressure double-effect compressed air energy storage system. The hydraulic constant-pressure double-effect compressed air energy storage system comprises an air energy storage unit and a hydraulic energy storage unit, wherein the air energy storage unit comprises an air compressor unit, an air turbine unit and an air storage, and the hydraulic energy storage unit comprises a high-level water source and a water turbine unit connected with the high-level water source. According to the hydraulic constant-pressure double-effect compressed air energy storage system, the gravity column is provided through the high-level water source, constant air supply pressure can be maintained in the air discharging and energy releasing process of the air storage, the system is more stable in the air discharging and energy releasing process, double-effect energy storage can be achieved, compressed air energy storage or pumped water energy storage can be separately achieved according to actual requirements, flexibility and adaptability of the system are stronger, and services such as power grid peak regulation can be provided through an electric power storage mode.)

1. The utility model provides a water conservancy constant voltage formula economic benefits and social benefits compressed air energy storage system which characterized in that: the system comprises an air energy storage unit and a hydraulic energy storage unit, wherein the air energy storage unit comprises an air compressor unit, an air turbine unit and an air storage, and the air compressor unit and the air turbine unit are respectively connected with the air storage; the hydraulic energy storage unit comprises a high-level water source and a hydraulic turbine unit connected with the high-level water source, and the hydraulic turbine unit is connected with the gas storage.

2. The hydraulic constant-pressure double-effect compressed air energy storage system according to claim 1, characterized in that: the air compressor unit and the air turbine unit are respectively connected with the top of the air storage through connecting pipelines.

3. The hydraulic constant-pressure double-effect compressed air energy storage system according to claim 2, characterized in that: and an air inlet valve is arranged on a connecting pipeline between the air compressor unit and the air storage.

4. The hydraulic constant-pressure double-effect compressed air energy storage system according to claim 2, characterized in that: and an exhaust valve is arranged on a connecting pipeline between the air turbine unit and the air storage.

5. the hydraulic constant-pressure double-effect compressed air energy storage system according to claim 1, characterized in that: and the bottom of the gas storage is provided with a water flowing port, and the water flowing port is connected with the hydraulic turbine unit through a water conveying pipeline.

6. The hydraulic constant-pressure double-effect compressed air energy storage system according to claim 1, characterized in that: the high-level water source is higher than the gas storage.

7. The hydraulic constant-pressure double-effect compressed air energy storage system according to claim 1, characterized in that: the air compressor set is connected with the first driving motor.

8. The hydraulic constant-pressure double-effect compressed air energy storage system according to claim 1, characterized in that: the air turbine set is coupled to a first generator.

9. The hydraulic constant-pressure double-effect compressed air energy storage system according to claim 1, characterized in that: and the hydraulic turbine set is respectively connected with the second generator and the second driving motor.

Technical Field

The invention relates to the technical field of energy storage, in particular to a hydraulic constant-pressure double-effect compressed air energy storage system.

Background

Pumped storage and compressed air storage are the large-scale energy storage technologies with the highest utilization value at present, play a promoting role in power grid regulation and renewable energy consumption grid connection, and are also key technologies for constructing strong smart power grids.

The compressed air energy storage adopts air as a working medium: during energy storage, the air compressor driven by electric power compresses air in the environment to a specific pressure and then stores the air in the air storage, so that the electric power is converted into air potential energy which is easy to store. When releasing energy, the high-pressure air released and stored by the air storage enters the air turbine to expand and do work, so that the air potential energy is converted into the rotational kinetic energy, and the rotational kinetic energy can be converted into electric energy through the generator.

In the energy releasing process, because the air turbine has a preset pressure requirement on the inlet pressure, when the pressure of the air released by the air storage reservoir is lower than the preset pressure, the energy releasing process has to be stopped, and the residual air in the air storage reservoir cannot be utilized. Because the air discharging process of the air storage is a process of gradually reducing the pressure, the pressure at the inlet of the air turbine is also reduced continuously, and the working condition of the air turbine is changed. That is, the existing compressed air energy storage system has the problem of unstable working condition in the energy release process.

Disclosure of Invention

Technical problem to be solved

The invention aims to provide a hydraulic constant-pressure double-effect compressed air energy storage system, which solves the problem that the existing compressed air energy storage system is unstable in working condition in the energy release process.

(II) technical scheme

In order to solve the technical problems, the invention provides a hydraulic constant-pressure double-effect compressed air energy storage system which comprises an air energy storage unit and a hydraulic energy storage unit, wherein the air energy storage unit comprises an air compressor set, an air turbine set and an air storage, and the air compressor set and the air turbine set are respectively connected with the air storage; the hydraulic energy storage unit comprises a high-level water source and a hydraulic turbine unit connected with the high-level water source, and the hydraulic turbine unit is connected with the gas storage.

Further, the air compressor unit and the air turbine unit are respectively connected with the top of the air storage through connecting pipelines.

Furthermore, an air inlet valve is arranged on a connecting pipeline between the air compressor unit and the air storage.

Furthermore, an exhaust valve is arranged on a connecting pipeline between the air turbine unit and the air storage.

Specifically, the bottom of the gas storage is provided with a water flowing port, and the water flowing port is connected with the hydraulic turbine unit through a water conveying pipeline.

Specifically, the high-level water source is located at a position higher than the position of the gas storage.

Further, the air compressor set is connected with the first driving motor.

Further, the air turbine set is coupled to a first generator.

Furthermore, the hydraulic turbine set is respectively connected with a second generator and a second driving motor.

(III) advantageous effects

The technical scheme of the invention has the following advantages:

According to the hydraulic constant-pressure double-effect compressed air energy storage system, during energy storage, the air compressor unit stores prepared high-pressure air in the air storage, the water turbine unit pumps water at the bottom of the air storage to a high-level water source, during energy release, the high-pressure air in the air storage enters the air turbine unit to perform expansion work, and meanwhile, the water in the high-level water source pushes the water turbine unit to perform work and then enters the air storage.

According to the hydraulic constant-pressure double-effect compressed air energy storage system provided by the invention, the gravity column is provided through the high-level water source, so that the constant air supply pressure of the air storage can be maintained in the air discharging and energy releasing process, the system is more stable in the air discharging and energy releasing process, and the problem of unstable working condition in the air discharging process of the conventional compressed air energy storage system is effectively solved.

The hydraulic constant-pressure double-effect compressed air energy storage system provided by the invention can be used for carrying out double-effect energy storage, and can also be used for carrying out compressed air energy storage or pumped storage alone according to actual requirements, so that the system has stronger flexibility and adaptability, and can provide services such as power grid peak regulation and the like in a power storage mode.

Drawings

Fig. 1 is a schematic structural diagram of a hydraulic constant-pressure double-effect compressed air energy storage system according to an embodiment of the invention.

In the figure: 1: an air compressor unit; 2: an air turbine unit; 3: a high-level water source; 4: a gas storage; 5: a water turbine unit; 6: an intake valve; 7: an exhaust valve; 8: a first drive motor; 9: a first generator; 10: a second generator; 11: a second drive motor.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.

As shown in fig. 1, an embodiment of the present invention provides a hydraulic constant pressure type double-effect compressed air energy storage system, which includes an air energy storage unit and a hydraulic energy storage unit.

The air energy storage unit comprises an air compressor unit 1, an air turbine unit 2 and an air storage 4, wherein the air compressor unit 1 and the air turbine unit 2 are respectively connected with the air storage 4.

The hydraulic energy storage unit comprises a high-level water source 3 and a hydraulic turbine set 5 connected with the high-level water source 3, and the hydraulic turbine set 5 is connected with the gas storage.

According to the hydraulic constant-pressure double-effect compressed air energy storage system disclosed by the embodiment of the invention, during energy storage, the air compressor unit 1 can produce high-pressure air and store the high-pressure air in the gas storage 4, and meanwhile, the hydraulic turbine unit 5 can pump water at the bottom of the gas storage 4 to the high-level water source 3. During energy release, high-pressure air in the air storage 4 enters the air turbine set 2 to perform expansion work, and water in the high-level water source 3 pushes the water turbine set 5 to perform work and then enters the air storage 4.

Further, the air compressor unit 1 and the air turbine unit 2 are connected to the top of the air storage 4 through connecting pipes, respectively.

Wherein, an air inlet valve 6 is arranged on a connecting pipeline between the air compressor unit 1 and the air storage 4.

An exhaust valve 7 is arranged on a connecting pipeline between the air turbine unit 2 and the gas storage 4.

Specifically, the bottom of the gas storage 4 is provided with a water flowing port, the water flowing port is connected with the high-level water source 3 through a water conveying pipeline, and the water turbine unit 5 is arranged on the water conveying pipeline.

Specifically, the high-level water source 3 is located at a position higher than the gas storage 4.

further, the air compressor assembly 1 is connected to a first drive motor 8.

Furthermore, the air turbine group 2 is connected to a first generator 9.

Further, the hydraulic turbine 5 is connected to a second generator 10 and a second driving motor 11, respectively. That is, the water turbine unit 5 may be used as a prime mover for hydraulic power when it rotates in the forward direction, and may be used as a water pump driven by electric power when the water turbine unit 5 rotates in the reverse direction.

The working principle of the hydraulic constant-pressure double-effect compressed air energy storage system provided by the embodiment of the invention is as follows:

When energy is stored, the air inlet valve 6 is opened, the exhaust valve 7 is closed, the first driving motor 8 drives the air compressor unit 1 to compress air under the drive of electric power, compressed high-pressure air is stored in the air storage 4, meanwhile, the second driving motor 11 drives the hydraulic turbine unit 5 to rotate reversely under the drive of electric power, so that water at the bottom of the air storage 4 is pumped into the high-level water source 3, and in the process, electric energy is respectively converted into high-pressure potential energy and high-level energy release for storage.

When energy is released, the air inlet valve 6 is closed, the exhaust valve 7 is opened, high-pressure air in the air storage 4 enters the air turbine unit 2 to perform expansion work, so that the first generator 9 is driven to output electric power, and meanwhile, water in the high-level water source 3 downwards pushes the water turbine unit 5 to rotate in the positive direction to do work and then enters the air storage 4, so that the second generator 10 is driven to output electric power.

In summary, the hydraulic constant-pressure double-effect compressed air energy storage system provided by the embodiment of the invention can maintain constant air supply pressure in the air discharging and energy releasing process of the air storage through the gravity column provided by the high-level water source, so that the system is more stable in the air discharging and energy releasing process, and the problem of unstable working condition in the air discharging process of the conventional compressed air energy storage system is effectively solved.

The hydraulic constant-pressure double-effect compressed air energy storage system disclosed by the embodiment of the invention can be used for carrying out double-effect energy storage, and can also be used for carrying out compressed air energy storage or pumped storage alone according to actual requirements, so that the system has stronger flexibility and adaptability, and can provide services such as power grid peak regulation and the like in a power storage mode.

In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and are therefore not to be considered limiting of the invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; may be mechanically coupled, may be electrically coupled or may be in communication with each other; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.