CN117249125A - High-voltage energy storage power generation system - Google Patents

Abstract

The invention relates to a high-voltage energy storage power generation system. The high-pressure energy storage power generation system comprises a first liquid storage tank, a second liquid storage tank, a high-pressure energy storage tank, a piston cylinder, a hydraulic driving mechanism and a power generation device. The piston cylinder includes a cylinder body and a piston member slidably mounted within the cylinder body. One end of the cylinder body is provided with a first inlet and a first outlet, and the other end of the cylinder body is provided with a second inlet and a second outlet. The first inlet is communicated with the first liquid storage tank through a first liquid inlet valve and a first liquid pump in sequence. The first outlet is communicated with the high-pressure energy storage tank through a first liquid outlet valve. The second inlet is respectively communicated with a liquid inlet of the hydraulic driving mechanism and an outlet of the second liquid pump through a second liquid inlet valve. The inlet of the second liquid pump is communicated with the second liquid storage tank. The second outlet is respectively communicated with a liquid outlet of the hydraulic driving mechanism and a second liquid storage tank through a second liquid outlet valve. The high-voltage energy storage power generation system has the advantages of high energy conversion efficiency and small energy loss during energy storage, and constant-frequency power generation during power generation, and is favorable for grid connection.

Description

High-voltage energy storage power generation system

Technical Field

The invention relates to the technical field of liquid air energy storage, in particular to a high-pressure energy storage power generation system.

Background

Currently, compressed air energy storage is one of the main methods for realizing high-power energy storage. The compressed air energy storage technology is to store air after being compressed in a closed high-pressure container or a natural geological cave to form air compression potential energy. When energy release is needed, compressed air is released and works through the expander to drive the generator to generate electricity. The conventional air compressor is generally used for compressing air, and the compression ratio of a single air compressor cannot be too large, so that if high-pressure compressed air is required to be obtained, a multi-stage compression system is required, and the system is complex and low in efficiency.

Disclosure of Invention

The application provides a high-voltage energy storage power generation system aiming at the defects of the prior art.

A high-pressure energy storage power generation system comprises a first liquid storage tank, a second liquid storage tank, a high-pressure energy storage tank, a piston cylinder, a hydraulic driving mechanism and a power generation device in transmission connection with the hydraulic driving mechanism;

the piston cylinder comprises a cylinder body with a hollow structure and a piston piece which is slidably arranged in the cylinder body; the piston member divides the space in the cylinder body into a first chamber and a second chamber which are independent; one end of the cylinder body is provided with a first inlet and a first outlet which are communicated with the first cavity, and the other end of the cylinder body is provided with a second inlet and a second outlet which are communicated with the second cavity;

the first inlet is communicated with the first liquid storage tank through a first liquid inlet valve and a first liquid pump in sequence; the first outlet is communicated with the high-pressure energy storage tank through a first liquid outlet valve; the second inlet is respectively communicated with a liquid inlet of the hydraulic driving mechanism and an outlet of the second liquid pump through a second liquid inlet valve; the inlet of the second liquid pump is communicated with the second liquid storage tank; the second outlet is communicated with the second liquid storage tank through a second liquid outlet valve; and a liquid outlet of the hydraulic driving mechanism is communicated with the second liquid storage tank.

According to the energy storage power generation system, the opening and closing sequence of the first liquid inlet valve, the first liquid outlet valve, the second liquid inlet valve and the second liquid outlet valve is controlled, and the first liquid in the first liquid storage tank can be gradually conveyed into the high-pressure energy storage tank by matching with the operation of the first liquid valve and the second liquid valve, so that the gas in the high-pressure energy storage tank is compressed until the gas pressure in the high-pressure energy storage tank is compressed to a preset value, and the whole energy storage process can be completed. In the process of compressing the gas in the high-pressure energy storage tank through the first liquid, the gas in the high-pressure energy storage tank is compressed through the liquid, so that the energy conversion efficiency is high.

In one embodiment, the piston cylinder is a plurality of piston cylinders; each first inlet is communicated with the outlet of the first liquid pump through the first liquid inlet valve; the inlet of the first liquid pump is communicated with the first liquid storage tank; each first outlet is communicated with the high-pressure energy storage tank through the first liquid outlet valve; each second inlet is respectively communicated with the liquid inlet of the hydraulic driving mechanism and the outlet of the second liquid pump through the second liquid inlet valve; each second outlet is communicated with the second liquid storage tank through the second liquid outlet valve;

the high-voltage energy storage power generation system further comprises a control device; the control device is used for controlling the opening and closing of the first liquid inlet valves, the first liquid outlet valves, the second liquid inlet valves and the second liquid outlet valves according to preset instructions, so that the sliding direction of part of the piston pieces is opposite to the sliding direction of the rest of the piston pieces.

In one embodiment, the system further comprises a first low-pressure pipeline, a first high-pressure pipeline, a second low-pressure pipeline and a second high-pressure pipeline;

the first low-pressure pipeline comprises a first low-pressure main pipe and a plurality of first low-pressure branch pipes; one end of the first low-pressure main pipe is communicated with the first liquid storage tank, and the other end of the first low-pressure main pipe is respectively communicated with a plurality of first low-pressure branch pipes; one end of the plurality of first low-pressure branch pipes far away from the first low-pressure main pipe is correspondingly communicated with the plurality of first inlets one by one; the first liquid pump is arranged on the first low-pressure main pipe; each first low-pressure branch pipe is provided with a first liquid inlet valve;

the first high-pressure pipeline comprises a first high-pressure main pipe and a plurality of first high-pressure branch pipes; one end of the first high-pressure main pipe is communicated with the high-pressure energy storage tank, and the other end of the first high-pressure main pipe is respectively communicated with a plurality of first high-pressure branch pipes; one end of the plurality of first high-pressure branch pipes far away from the first high-pressure main pipe is correspondingly communicated with the plurality of first outlets one by one; each first high-pressure branch pipe is provided with a first liquid outlet valve;

the second low-pressure pipeline comprises a second low-pressure main pipe and a plurality of second low-pressure branch pipes; two ends of the second low-pressure main pipe are respectively communicated with a liquid outlet of the hydraulic driving mechanism and the second liquid storage tank; one end of each of the second low-pressure branch pipes is correspondingly communicated with the second outlets one by one, and the other end of each of the second low-pressure branch pipes is communicated with the second low-pressure main pipe; each second low-pressure branch pipe is provided with a second liquid outlet valve; a back pressure valve is arranged at one end of the second low-pressure main pipe, which is close to the second liquid storage tank;

the second high-pressure pipeline comprises a second high-pressure main pipe and a plurality of second high-pressure branch pipes; two ends of the second high-pressure main pipe are respectively communicated with a liquid inlet of the hydraulic driving mechanism and the second liquid storage tank; one end of each of the second high-pressure branch pipes is communicated with the corresponding second inlets one by one, and the other end of each of the second high-pressure branch pipes is communicated with the corresponding second high-pressure main pipe; each second high-pressure branch pipe is provided with a second liquid inlet valve; and one end of the second high-pressure main pipe, which is close to the second liquid storage tank, is provided with the second liquid pump and a one-way valve.

Thus, the communication work among all parts in the high-voltage energy storage power generation system can be facilitated.

The working modes of the high-voltage energy storage power generation system comprise an energy storage mode and a power generation mode;

when the device is in an energy storage mode, the opening and closing sequence of the first liquid inlet valve, the first liquid outlet valve, the second liquid inlet valve and the second liquid outlet valve is controlled, the first liquid in the first liquid storage tank is injected into the first cavity through the first liquid pump, the second liquid is injected into the second cavity through the second liquid pump, so that the piston member is pushed to convey the first liquid injected into the cylinder body to the high-pressure energy storage tank, the gas in the high-pressure energy storage tank is compressed, and therefore more first liquid is gradually conveyed into the high-pressure energy storage tank from the first liquid storage tank through the reciprocating work of the piston member until the gas pressure in the high-pressure energy storage tank is compressed to reach a preset value, and the whole energy storage process can be realized;

when the power generation device is in a power generation mode, the first liquid inlet valve and the second liquid outlet valve corresponding to one or more piston cylinders are controlled to be closed, the first liquid outlet valve and the second liquid inlet valve are opened, gas in the high-pressure energy storage tank expands, first liquid in the high-pressure energy storage tank is pushed into the first cavity corresponding to one or more piston cylinders, so that the piston piece is pushed to push second liquid in the second cavity corresponding to one or more piston cylinders into the hydraulic driving mechanism, and the hydraulic driving mechanism is enabled to operate to drive the power generation device to perform power generation; simultaneously, through controlling and opening second drain valve and first feed liquor valve that other one or more piston cylinders correspond, close first drain valve and second feed liquor valve for the second liquid of hydraulic drive mechanism liquid outlet department flows back to the second cavity that other one or more piston cylinders correspond in, in order to promote the piston spare with the first liquid propelling movement in the first cavity to first liquid reserve tank, until the compressed air energy release in the high-pressure energy storage jar finishes, accomplishes whole power generation process.

Therefore, the working mode of the high-pressure energy storage power generation system comprises an energy storage mode and a power generation mode, the control device is used for respectively controlling the first liquid inlet valves, the first liquid outlet valves, the second liquid inlet valves and the second liquid outlet valves to be opened and closed according to a certain sequence, and the first liquid pump and the second liquid pump are matched to operate, so that the first liquid can be continuously conveyed into the high-pressure energy storage tank in the energy storage mode, the second liquid can be continuously conveyed into the hydraulic driving mechanism in the power generation mode, and the first liquid is sent back into the first liquid storage tank.

In one embodiment, further comprising an insulator; the heat insulator is transversely and slidably arranged in the high-pressure energy storage tank and used for separating gas and liquid in the high-pressure energy storage tank. The insulator is used for separating liquid and gas in the high-pressure energy storage tank so as to prevent heat generated in the gas compression process from being transferred to the liquid in the high-pressure energy storage tank.

In one embodiment, a heat insulation layer is formed on the outer surface of the high-pressure energy storage tank. The heat insulation layer can improve the heat insulation performance of the high-pressure energy storage tank.

In one embodiment, the top end of the high-pressure energy storage tank is provided with an air inlet and outlet hole; the high-pressure energy storage power generation system further comprises a gas pipe communicated with the gas inlet and outlet holes; the gas pipe is provided with a gas valve. Thus, the functions of gas injection, ventilation and the like can be realized in the high-pressure energy storage tank.

In one embodiment, the first liquid pump is a water pump; the second liquid pump is an oil pump; the hydraulic driving mechanism is a hydraulic motor; the power generation device comprises a gearbox in transmission connection with the hydraulic motor and a generator in transmission connection with the gearbox.

In one embodiment, the hydraulic motor is a variable displacement motor; the high-voltage energy storage power generation system also comprises a controller and a rotation speed sensor; the rotating speed sensor is in communication connection with the controller and is used for acquiring the output rotating speed of the variable motor in real time; the controller is electrically connected with the variable motor and is used for adaptively adjusting the displacement of the hydraulic motor according to the output rotating speed so as to enable the variable motor to output at a constant rotating speed. Therefore, even if the input flow of the variable motor fluctuates, the variable motor can ensure constant-speed output, maintain constant-frequency power generation of the generator and be beneficial to grid connection.

In one embodiment, the side wall of the first liquid storage tank is provided with a first opening and a second opening at intervals; the first opening is communicated with the first inlet, and the first liquid pump is arranged on the communication passage; the second opening is communicated with the first inlet, and a liquid return valve is arranged on the communication passage. The liquid return passage and the liquid outlet passage of the first liquid storage tank are independently arranged, so that the first liquid can flow back conveniently.

In this application, because the gas in the high-pressure energy storage tank is compressed through the liquid, energy conversion efficiency is high. The high-pressure energy storage container with the heat insulation layer and the intermediate heat insulator can ensure that heat energy generated by compression is not lost, and can convert the heat energy into potential energy of gas for use under certain conditions. In addition, the hydraulic driving mechanism can realize constant-speed output, maintains constant-frequency power generation of the power generation device, and is beneficial to grid connection.

Drawings

Fig. 1 is a schematic diagram of a high-voltage energy storage power generation system according to a preferred embodiment of the present invention.

Reference numerals in the detailed description indicate: 10. a high-voltage energy storage power generation system; 100. a first reservoir; 110. a first opening; 120. a second opening; 200. a second liquid storage tank; 300. a high pressure energy storage tank; the method comprises the steps of carrying out a first treatment on the surface of the 400. A piston cylinder; 410. a cylinder; 411. a first chamber; 412. a second chamber; 420. a piston member; 430. a first liquid inlet valve; 440. a first liquid outlet valve; 450. a second liquid inlet valve; 460. a second liquid outlet valve; 500. a hydraulic drive mechanism; 600. a power generation device; 610. a gearbox; 620. a generator; 710. a first liquid pump; 720. a second liquid pump; 810. a first low pressure line; 811. a first low pressure manifold; 812. a first low pressure branch pipe; 820. a first high pressure line; 821. a first high pressure manifold; 822. a first high-pressure branch pipe; 830. a second low pressure line; 831. a second low pressure manifold; 832. a second low pressure branch pipe; 840. a second high pressure line; 841. a second high pressure manifold; 842. a second high-pressure branch pipe; 910. a one-way valve; 920. a back pressure valve; 930. a liquid return valve; 20. and (3) a power grid.

Detailed Description

In order that the invention may be readily understood, a more complete description of the invention will be rendered by reference to the appended drawings. Preferred embodiments of the present invention are shown in the drawings. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.

Unless defined otherwise, 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 invention belongs. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and/or" as used herein includes any and all combinations of one or more of the associated listed items.

When an element is referred to as being "on" another element, it can be directly on the other element or intervening elements may also be present unless otherwise specified. It will also be understood that when an element is referred to as being "between" two elements, it can be the only one between the two elements or one or more intervening elements may also be present.

Where the terms "comprising," "having," and "including" are used herein, another component may also be added unless explicitly defined as such, e.g., "consisting of … …," etc. Unless mentioned to the contrary, singular terms may include plural and are not to be construed as being one in number.

Further, the drawings are not 1:1, and the relative dimensions of the various elements are drawn by way of example only in the drawings and are not necessarily drawn to true scale.

Fig. 1 shows a structure of a high-voltage energy storage power generation system in an embodiment of the present invention. For convenience of explanation, the drawings show only structures related to the embodiments of the present invention.

Referring to fig. 1, a high-pressure energy storage power generation system 10 according to a preferred embodiment of the present invention includes a first tank 100, a second tank 200, a high-pressure energy storage tank 300, a piston cylinder 400, a hydraulic driving mechanism 500 and a power generation device 600.

The first tank 100 is for storing a first liquid. The second tank 200 is used for storing a second liquid. The first liquid and the second liquid may be the same liquid or may be different liquids. The space within the high pressure accumulator tank 300 is a place for storing and compressing gas. Specifically, the first liquid is immiscible or has low solubility with the gas within the high pressure storage tank 300. The shapes of the first tank 100 and the second tank 200 are not limited, as long as the liquid storage can be realized; the shape of the high-pressure accumulator tank 300 is not limited, as long as it is resistant to high pressure, high temperature and good in sealing property.

The piston cylinder 400 includes a cylinder body 410 having a hollow structure and a piston member 420 slidably installed in the cylinder body 410. The piston member 420 divides the space within the cylinder 410 into separate first and second chambers 411 and 412. One end of the cylinder 411 is provided with a first inlet (not shown) and a first outlet (not shown) which are communicated with the first chamber 411, and the other end is provided with a second inlet (not shown) and a second outlet (not shown) which are communicated with the second chamber 412. The cylinder 411 may be disposed vertically or laterally, and in this embodiment, the cylinder 411 is disposed laterally. When the cylinder 411 is disposed laterally, the first chamber 411 and the second chamber 412 are disposed at intervals along the horizontal direction.

The first inlet is in turn in communication with the first reservoir 100 via a first inlet valve 430 and a first liquid pump 710. The first outlet communicates with the high pressure accumulator tank 300 through a first outlet valve 440. The second inlet communicates with the inlet of the hydraulic drive mechanism 500 and the outlet of the second liquid pump 720 via the second inlet valve 450, respectively. The inlet of the second liquid pump 720 communicates with the second liquid reservoir 200. The second outlet is respectively communicated with a liquid outlet of the hydraulic driving mechanism 500 and the second liquid storage tank 200 through a second liquid outlet valve 460.

For easy understanding, the following will briefly describe the operation of the high-voltage energy storage power generation system 10 described above:

first, the first liquid inlet valve 430 and the second liquid outlet valve 460 are opened, the first liquid outlet valve 440 and the second liquid inlet valve 450 are closed, the first liquid pump 710 is started to suck the first liquid in the first liquid storage tank 100 into the first chamber 411 so as to push the piston member 420 to slide along the direction towards the second inlet, and meanwhile, the second liquid in the second chamber 412 flows back into the second liquid storage tank 200 through the second outlet; when the piston 412 slides to one end of the cylinder 411 where the first inlet is provided, the first liquid inlet valve 430 and the second liquid outlet valve 460 are closed, the first liquid outlet valve 440 and the second liquid inlet valve 450 are opened, the second liquid pump 720 is started to inject the second liquid in the second liquid storage tank 200 into the second chamber 412, the piston 412 is pushed by the second liquid to slide along the direction towards the first inlet, the first liquid in the first chamber 411 is pushed into the high-pressure energy storage tank 300, and the gas in the high-pressure energy storage tank 300 is compressed by the first liquid; so reciprocating, more first liquid is gradually conveyed from the first liquid storage tank 100 to the high-pressure energy storage tank 300, and the gas in the high-pressure energy storage tank 300 is continuously compressed until the gas pressure in the high-pressure energy storage tank 300 is compressed to a preset value, so that electric energy can be converted into potential energy and heat energy of compressed gas for storage.

During the energy storage process, the hydraulic drive mechanism 500 and the power generation device 600 are not operated. In order to more intuitively understand the energy storage process of the high-pressure energy storage power generation system 10, when the first liquid enters the high-pressure energy storage tank 300 and compresses the gas in the high-pressure energy storage tank 300, the state between the gas and the liquid in the high-pressure energy storage tank 300 is shown in fig. 1, Q represents the gas in the high-pressure energy storage tank 300, and L represents the liquid in the high-pressure energy storage tank 300.

Therefore, the piston cylinder 400 is respectively matched with the first liquid pump 710 and the second liquid pump 720, so that the first liquid can compress the gas in the high-pressure energy storage tank 300, energy conversion and storage are realized, and in the process of compressing the gas in the high-pressure energy storage tank 300 through the first liquid, the gas in the high-pressure energy storage tank 300 is compressed through the liquid, so that the energy conversion efficiency is high.

In some embodiments, the piston cylinder 400 is multiple. Each first inlet communicates with the outlet of the first liquid pump 710 through a first liquid inlet valve 430. The inlet of the first liquid pump 710 communicates with the first reservoir 100. Each first outlet communicates with the high pressure storage tank 300 through a first outlet valve 440. Each of the second inlets is respectively communicated with the liquid inlet of the hydraulic driving mechanism 500 and the outlet of the second liquid pump 720 through the second liquid inlet valve 450. Each second outlet is respectively communicated with the second liquid storage tank 200 and the liquid outlet of the hydraulic driving mechanism 500 through a second liquid outlet valve 460.

The high-voltage energy-storage power generation system 10 further includes a control device (not shown). The control device is configured to control the opening and closing of the first liquid inlet valves 430, the first liquid outlet valves 440, the second liquid inlet valves 450, and the second liquid outlet valves 460 according to a preset command, so that the sliding direction of the part of the piston members 420 is opposite to the sliding direction of the rest of the piston members 420.

The plural number means a number of 2 or more. The modes of operation of the high voltage energy storage power generation system 10 include an energy storage mode and a power generation mode.

For convenience of explanation, the operation of the high-pressure energy storage power generation system 10 will be described below by taking two piston cylinders 400 as an example, and the first liquid inlet valve 430 connected to one piston cylinder 400, the first liquid outlet valve 440 connected to the other piston cylinder 400, the second liquid outlet valve 460 connected to one piston cylinder 400, and the second liquid inlet valve 450 connected to one piston cylinder 400 are grouped into one group, and the first liquid outlet valve 440 connected to one piston cylinder 400, the first liquid inlet valve 430 connected to the other piston cylinder 400, the second liquid inlet valve 450 connected to one piston cylinder 400, and the second liquid outlet valve 460 connected to the other piston cylinder 400 are grouped into one group:

in the energy storage mode: the first liquid pump 710 and the second liquid pump 720 are operated all the time, and the two sets of valves are controlled to be opened and closed alternately by the control device (i.e. when the valves of all the valves in one set of valves are opened, the valves of all the valves in the other set of valves are closed), so that the two piston members 420 slide in opposite directions in the respective cylinders 410, so that one piston cylinder 400 performs the operation of injecting the first liquid in the first liquid storage tank 100 into the first chamber 411 while the other piston cylinder 400 performs the operation of injecting the first liquid in the first chamber 411 into the high-pressure energy storage tank 300, and thus the first liquid is continuously injected into the high-pressure energy storage tank 300 by alternately and reciprocally performing the operation, so that the gas in the high-pressure energy storage tank 300 is continuously compressed until the pressure of the compressed gas in the high-pressure energy storage tank 300 reaches the preset pressure value, and the whole energy storage operation can be completed;

in the power generation mode: the hydraulic driving mechanism 500 is started, and the two sets of valves are controlled to be opened and closed alternately by the control device, so that the two piston members 420 can slide in opposite directions in the respective cylinder bodies 410, so that one piston cylinder 400 pushes the second liquid in the second chamber 412 of the piston member to the hydraulic driving mechanism 500, the other piston cylinder 400 pushes the first liquid in the first chamber 411 into the first liquid storage tank 100 by using the second liquid flowing back by the hydraulic driving mechanism 500 while driving the hydraulic driving mechanism 500 to operate, and the two piston cylinders are alternately reciprocated until the liquid in the high-pressure energy storage tank 300 is exhausted, and the hydraulic driving mechanism 500 can be continuously supplied with liquid continuously, so that the power generation device 600 can stably and continuously output electric energy.

For more complete description of the high-pressure energy storage power generation system 10, a simple description will be given of the case where the number of the piston cylinders 400 is greater than 2: when in use, the control device controls the first liquid inlet valves 430, the first liquid outlet valves 440, the second liquid inlet valves 450 and the second liquid outlet valves 460 to open and close according to a certain sequence, so that the piston members 420 slide in a staggered manner in sequence, and the sliding direction of each piston member 420 is opposite or opposite to the sliding direction of at least one other piston member 420, so that the continuity of injecting the first liquid into the first chamber 411 and pushing the first liquid in the first chamber 411 into the high-pressure energy storage tank 300 in the energy storage process is better, the continuity of conveying the second liquid in the second chamber 412 into the hydraulic driving mechanism 500 and returning the first liquid in the first chamber 411 into the first liquid storage tank 100 in the power generation process is better, and the stable and continuous operation of the high-pressure energy storage power generation system 10 can be ensured.

During the power generation, the first liquid pump 710 and the second liquid pump 720 are not operated.

For ease of understanding, the use scenario of the high voltage energy storage power generation system 10 described above is illustrated: in the high-voltage energy storage power generation system 10, the electric energy of the municipal power grid 20 can be utilized to drive the first liquid pump 710 and the second liquid pump 720 to work so as to realize energy storage work; when the high-voltage energy storage power generation system 10 performs power generation, the electric energy generated by the power generation device 600 can be directly input into the national power grid 20, or can be directly supplied to electric equipment.

Further, in some embodiments, the high pressure energy storage power generation system 10 further includes a first low pressure line 810, a first high pressure line 820, a second low pressure line 830, and a second high pressure line 840.

The first low pressure line 810 includes a first low pressure manifold 811 and a plurality of first low pressure branch pipes 812. One end of the first low-pressure manifold 811 communicates with the first tank 100, and the other end communicates with a plurality of first low-pressure branch pipes 812, respectively. One end of the plurality of first low-pressure branch pipes 812, which is far from the first low-pressure manifold 811, communicates with the plurality of first inlets in one-to-one correspondence, respectively. The first liquid pump 710 is disposed on the first low pressure manifold 811. A first inlet valve 430 is provided on each first low pressure branch 812.

The first high-pressure line 820 includes a first high-pressure manifold 821 and a plurality of first high-pressure branch pipes 822. One end of the first high-pressure manifold 821 communicates with the high-pressure accumulator tank 300, and the other end communicates with a plurality of first high-pressure branch pipes 822, respectively. One end of the plurality of first high-pressure branch pipes 822, which is far from the first high-pressure main pipe 821, is respectively communicated with the plurality of first outlets in a one-to-one correspondence. Each first high-pressure branch pipe 822 is provided with a first liquid outlet valve 440.

The second low pressure line 830 includes a second low pressure manifold 831 and a plurality of second low pressure branches 832. Both ends of the second low-pressure manifold 831 are respectively communicated with the liquid outlet of the hydraulic driving mechanism 500 and the second liquid storage tank 200. One end of each of the plurality of second low-pressure branch pipes 832 is communicated with the plurality of second outlets in one-to-one correspondence, and the other end of each of the plurality of second low-pressure branch pipes 832 is communicated with the second high-pressure branch pipe 832. A second outlet valve 460 is provided on each second low pressure branch 832. The second low pressure manifold 831 is provided with a back pressure valve 920 at an end adjacent to the second tank 200.

The second high pressure line 840 includes a second high pressure manifold 841 and a plurality of second high pressure branches 842. Both ends of the second high-pressure manifold 841 are respectively communicated with the liquid inlet of the hydraulic driving mechanism 500 and the second liquid storage tank 200. One end of the plurality of second high-pressure branch pipes 842 is respectively communicated with the plurality of second inlets in one-to-one correspondence, and the other end is communicated with the second high-pressure main pipe 841. A second inlet valve 450 is provided on each second high pressure branch 842. The second high-pressure manifold 841 is provided with a second fluid pump 720 and a check valve 910 at one end thereof adjacent to the second reservoir 200.

As such, communication between the various portions of the high pressure energy storage power generation system 10 may be achieved through the first high pressure line 820, the second high pressure line 840, the first low pressure line 810, and the second low pressure line 830.

The check valve 910 prevents the second liquid in the second high-pressure pipe from flowing back into the second liquid storage tank 200, so as to ensure that the second liquid in the second chamber 412 and the fourth chamber 4212 can only flow to the hydraulic driving mechanism 500 in the power generation process of the high-pressure energy storage power generation system 10.

The back pressure valve 920 may set a different back pressure in the second low pressure manifold 831, for example, during the energy storage process, the back pressure of the back pressure valve 920 may be adjusted to be minimum, so as to ensure that the second liquid in each second chamber 412 can smoothly flow back into the second tank 200; in the power generation process, the back pressure of the back pressure valve 920 is adjusted to a preset pressure value, so that the second liquid at the liquid outlet of the hydraulic driving mechanism 500 can directly flow back into the second chamber 412, the condition that the second liquid at the liquid outlet of the hydraulic driving mechanism 500 flows back into the second liquid storage tank 200 is avoided, and the power generation reliability is improved.

Of course, in other embodiments, the first high-pressure pipeline 820, the first low-pressure pipeline 810, the second high-pressure pipeline 840 and the second low-pressure pipeline 830 may be replaced by other types of channels, for example, when the high-pressure energy-storage power generation system 10 is designed to be small and the rest parts except the hydraulic driving mechanism 500 and the power generation device 600 are all of an integral structure, the communication channels between the parts may be directly formed inside the integral structure.

In some embodiments, the high voltage energy storage power generation system 10 further includes insulation (not shown). The insulator is laterally and slidably disposed within the high pressure storage tank 300 for separating gas and liquid within the high pressure storage tank 300.

The heat insulator may be a rigid part with heat insulation performance or a flexible part with heat insulation performance, so long as the liquid and the gas in the high-pressure energy storage tank 300 can be separated, heat generated in the gas compression process is prevented from being transferred to the liquid in the high-pressure energy storage tank 300, and energy loss caused by transferring heat energy in the gas to the first liquid is reduced.

When the high-pressure energy storage tank 300 contains liquid, the insulator is positioned on the liquid surface of the liquid and moves up and down in the high-pressure energy storage pipe as the liquid surface rises and falls; when there is no liquid in the high-pressure energy storage tank 300, the insulator is located at the bottom of the high-pressure energy storage tank 300 and covers the liquid inlet in the high-pressure energy storage tank 300.

In some embodiments, an outer surface of the high pressure storage tank 300 is formed with a layer of insulation (not shown). The heat insulation layer may be a heat insulation member wrapped on the outer surface of the high-pressure energy storage tank 300, may be a heat insulation coating coated on one side of the outer surface of the high-pressure energy storage tank 300, or may be a heat insulation structure formed on the outer surface of the high-pressure energy storage tank 300 in other manners. The heat insulation layer can prevent heat generated by the gas in the high-pressure energy storage tank 300 in the compression process from being lost to the outside, so that the heat energy is ensured not to be lost, and the heat energy can be converted into potential energy of the gas under certain conditions for use.

In some embodiments, the top end of the high pressure energy storage tank 300 is provided with an air inlet and outlet hole (not shown). The high pressure energy storage power generation system 10 also includes a gas delivery conduit in communication with the gas inlet and outlet apertures. The gas pipe is provided with a gas valve. Thus, the functions of gas injection, ventilation and the like in the high-pressure energy storage tank 300 can be realized through the gas pipe and the gas valve.

In some embodiments, the first liquid pump 710 is a water pump. The second liquid pump 720 is an oil pump. The hydraulic drive mechanism 500 is a hydraulic motor. The power generation device 600 includes a gearbox 610 drivingly connected to a hydraulic motor and a generator 620 drivingly connected to a gearbox 1001.

In other embodiments of the present invention, the first liquid and the second liquid may be water or hydraulic oil at the same time, or may be other liquids besides water and hydraulic oil, as long as the second liquid is capable of driving the hydraulic driving mechanism 500 to operate, and the first liquid is insoluble or has very low solubility with the gas in the high-pressure energy storage tank 300.

Further, in some embodiments, the hydraulic motor is a variable displacement motor. The high-voltage energy-storage power generation system 10 further includes a controller (not shown) and a rotational speed sensor (not shown). The rotation speed sensor is in communication connection with the controller and is used for acquiring the output rotation speed of the variable motor in real time. The controller is electrically connected with the variable motor and is used for adaptively adjusting the displacement of the variable motor according to the output rotating speed so as to output the variable motor at a constant rotating speed.

The controller may be a control mechanism disposed on the variable displacement motor, or may be a control device for controlling the opening and closing of the first liquid inlet valve 430, the first liquid outlet valve 440, the second liquid inlet valve 450, and the second liquid outlet valve 460 in the foregoing embodiments. Specifically, the rotation speed sensor is arranged on the variable motor and is used for acquiring the actual output rotation speed of the variable motor in real time.

Specifically, when the actual output rotation speed measured by the rotation speed sensor is greater than a preset threshold value, the controller immediately increases the displacement of the variable motor until the output rotation speed of the variable motor is equal to the preset threshold value; when the actual output rotating speed measured by the rotating speed sensor is smaller than a preset threshold value, the controller immediately adjusts the displacement of the variable motor to be smaller until the output rotating speed of the variable motor is equal to the preset threshold value. Therefore, even if the input flow of the variable motor fluctuates, the variable motor can ensure constant-speed output, maintain constant-frequency power generation of the generator and be beneficial to grid connection.

In some embodiments, the side wall of the first liquid storage tank 100 is provided with a first opening 110 and a second opening 120 at intervals. The first opening 110 communicates with the first inlet, and a first liquid pump 710 is provided on the communication path. The second opening 120 communicates with the first inlet, and a liquid return valve 930 is provided in the communication path.

In this way, in the power generation process of the high-pressure energy-storage power generation system 10, when the piston member 412 slides to the end of the cylinder 411 provided with the second inlet, after pushing the second liquid in the second chamber 412 to the hydraulic driving mechanism 500, the first liquid inlet valve 430 and the second liquid outlet valve 460 are opened, the first liquid outlet valve 440 and the second liquid inlet valve 450 are closed, and simultaneously the second liquid pump 720 operates to suck the liquid in the second liquid storage tank 200 into the second chamber 412, so that the first liquid in the first chamber 411 is pushed into the first liquid storage tank 100 through the second opening 120 by using the piston member 412, and the backflow of the first liquid is achieved.

When the piston cylinder 400 is plural, the first openings 110 are respectively communicated with the plural first inlets, and the first liquid pump 710 is provided on the communication path. The second openings 120 are respectively communicated with the plurality of first inlets, and a liquid return valve 930 is provided on the communication path.

Of course, in other embodiments, the return of the first liquid during power generation may also be accomplished by reversing the first liquid pump 710.

The technical features of the above-described embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above-described embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.

The above examples illustrate only a few embodiments of the invention, which are described in detail and are not to be construed as limiting the scope of the invention. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the invention, which are all within the scope of the invention. Accordingly, the scope of protection of the present invention is to be determined by the appended claims.

Claims (8)

1. The high-pressure energy storage power generation system is characterized by comprising a first liquid storage tank, a second liquid storage tank, a high-pressure energy storage tank, a piston cylinder, a hydraulic driving mechanism and a power generation device in transmission connection with the hydraulic driving mechanism;

the piston cylinder comprises a cylinder body with a hollow structure and a piston piece which is slidably arranged in the cylinder body; the piston member divides the space in the cylinder body into a first chamber and a second chamber which are independent; one end of the cylinder body is provided with a first inlet and a first outlet which are communicated with the first cavity, and the other end of the cylinder body is provided with a second inlet and a second outlet which are communicated with the second cavity;

the first inlet is communicated with the first liquid storage tank through a first liquid inlet valve and a first liquid pump in sequence; the first outlet is communicated with the high-pressure energy storage tank through a first liquid outlet valve; the second inlet is respectively communicated with a liquid inlet of the hydraulic driving mechanism and an outlet of the second liquid pump through a second liquid inlet valve; the inlet of the second liquid pump is communicated with the second liquid storage tank; the second outlet is respectively communicated with a liquid outlet of the hydraulic driving mechanism and the second liquid storage tank through a second liquid outlet valve.

2. The high pressure energy storage power generation system of claim 1, wherein the piston cylinder is a plurality of piston cylinders; each first inlet is communicated with the outlet of the first liquid pump through the first liquid inlet valve; the inlet of the first liquid pump is communicated with the first liquid storage tank; each first outlet is communicated with the high-pressure energy storage tank through the first liquid outlet valve; each second inlet is respectively communicated with the liquid inlet of the hydraulic driving mechanism and the outlet of the second liquid pump through the second liquid inlet valve; each second outlet is respectively communicated with a liquid outlet of the hydraulic driving mechanism and the second liquid storage tank through the second liquid outlet valve;

the high-voltage energy storage power generation system further comprises a control device; the control device is used for controlling the opening and closing of the first liquid inlet valves, the first liquid outlet valves, the second liquid inlet valves and the second liquid outlet valves according to preset instructions, so that the sliding direction of part of the piston pieces is opposite to the sliding direction of the rest of the piston pieces.

3. The high pressure energy storage power generation system of claim 2, further comprising a first low pressure line, a first high pressure line, a second low pressure line, and a second high pressure line;

the first low-pressure pipeline comprises a first low-pressure main pipe and a plurality of first low-pressure branch pipes; one end of the first low-pressure main pipe is communicated with the first liquid storage tank, and the other end of the first low-pressure main pipe is respectively communicated with a plurality of first low-pressure branch pipes; one end of the plurality of first low-pressure branch pipes far away from the first low-pressure main pipe is correspondingly communicated with the plurality of first inlets one by one; the first liquid pump is arranged on the first low-pressure main pipe; each first low-pressure branch pipe is provided with a first liquid inlet valve;

the first high-pressure pipeline comprises a first high-pressure main pipe and a plurality of first high-pressure branch pipes; one end of the first high-pressure main pipe is communicated with the high-pressure energy storage tank, and the other end of the first high-pressure main pipe is respectively communicated with a plurality of first high-pressure branch pipes; one end of the plurality of first high-pressure branch pipes far away from the first high-pressure main pipe is correspondingly communicated with the plurality of first outlets one by one; each first high-pressure branch pipe is provided with a first liquid outlet valve;

the second low-pressure pipeline comprises a second low-pressure main pipe and a plurality of second low-pressure branch pipes; two ends of the second low-pressure main pipe are respectively communicated with a liquid outlet of the hydraulic driving mechanism and the second liquid storage tank; one end of each of the second low-pressure branch pipes is correspondingly communicated with the second outlets one by one, and the other end of each of the second low-pressure branch pipes is communicated with the second low-pressure main pipe; each second low-pressure branch pipe is provided with a second liquid outlet valve; a back pressure valve is arranged at one end of the second low-pressure main pipe, which is close to the second liquid storage tank;

the second high-pressure pipeline comprises a second high-pressure main pipe and a plurality of second high-pressure branch pipes; two ends of the second high-pressure main pipe are respectively communicated with a liquid inlet of the hydraulic driving mechanism and the second liquid storage tank; one end of each of the second high-pressure branch pipes is communicated with the corresponding second inlets one by one, and the other end of each of the second high-pressure branch pipes is communicated with the corresponding second high-pressure main pipe; each second high-pressure branch pipe is provided with a second liquid inlet valve; and one end of the second high-pressure main pipe, which is close to the second liquid storage tank, is provided with the second liquid pump and a one-way valve.

4. The high voltage energy storage power generation system of claim 1 further comprising an insulator; the heat insulator is transversely and slidably arranged in the high-pressure energy storage tank and used for separating gas and liquid in the high-pressure energy storage tank.

5. The high-pressure energy storage power generation system according to claim 1, wherein a heat insulation layer is formed on the outer surface of the high-pressure energy storage tank.

6. The high pressure energy storage power generation system of claim 1, wherein the first liquid pump is a water pump; the second liquid pump is an oil pump; the hydraulic driving mechanism is a hydraulic motor; the power generation device comprises a gearbox in transmission connection with the hydraulic motor and a generator in transmission connection with the gearbox.

7. The high pressure energy storage power generation system of claim 6, wherein the hydraulic motor is a variable displacement motor; the high-voltage energy storage power generation system also comprises a controller and a rotation speed sensor; the rotating speed sensor is in communication connection with the controller and is used for acquiring the output rotating speed of the variable motor in real time; the controller is electrically connected with the variable motor and is used for adaptively adjusting the displacement of the variable motor according to the output rotating speed so as to enable the variable motor to output at a constant rotating speed.

8. The high voltage energy storage power generation system of claim 1, wherein the side wall of the first liquid storage tank is provided with a first opening and a second opening at intervals; the first opening is communicated with the first inlet, and the first liquid pump is arranged on the communication passage; the second opening is communicated with the first inlet, and a liquid return valve is arranged on the communication passage.