CN220267792U - Crank connecting rod driving isothermal compressed air energy storage power generation system - Google Patents

Abstract

The utility model provides a crank-connecting rod driven isothermal compressed air energy storage power generation system, which includes a compressed air energy storage device and a control system. The control system is used to control the compression energy storage and expansion energy release of the compressed air energy storage device; The compressed air energy storage device includes a temperature-controlled liquid piston unit, a graded isothermal compressed air subsystem and a constant pressure gas storage unit. The temperature-controlled liquid piston unit is used to transfer liquid back and forth with the graded isothermal compressed air subsystem. The graded isothermal compressed air The subsystem is used for gas transmission back and forth with the constant pressure gas storage unit; the temperature-controlled liquid piston unit includes a permanent magnet three-phase synchronous motor, a piston connecting rod, a crank connecting rod and a multi-stage hydraulic piston device. The multi-stage hydraulic piston device passes The piston connecting rod and the crank connecting rod are synchronously connected and driven with the permanent magnet three-phase synchronous motor. This system improves the energy efficiency of the system, thereby improving the power generation efficiency of the compressed air energy storage system.

Description

Crank-connecting rod driven isothermal compressed air energy storage power generation system

Technical field

The utility model relates to the field of compressed air energy storage. Specifically, it relates to a crank connecting rod driven isothermal compressed air energy storage power generation system.

Background technique

Among many energy storage technologies, compressed air energy storage equipment is entirely composed of mechanical and electrical structures. Through the work of the equipment, energy can be converted between "electric energy ← → air potential energy". It has high efficiency, long life, no waste pollution, and no chemical media. Consumption and other characteristics, therefore compressed air energy storage is one of the pure green energy storage technologies with development potential.

For example, the invention patent application with publication number CN104806313A specifically discloses an isothermal compressed air energy storage system and method. Injectors are respectively installed at the air inlets of the compressor unit and the expansion unit. During the energy storage and compression process, through the The mist or foam liquid heat exchange medium is sprayed into the compressed air to achieve a quasi-isothermal compression process, thereby reducing the compression work per unit of working fluid. A gas-liquid separator is installed after the compressor unit to separate the cooling medium in the compressed air and store it. ; In the energy-releasing expansion process, a quasi-isothermal expansion process is achieved by spraying mist or foam liquid heat exchange medium into the expanding gas, thereby increasing the output power per unit of working fluid and improving the overall efficiency of the system. However, the screw air compressor and expander used in the gas compression and expansion process of this system need to be driven by air, and their energy efficiency is low.

In order to solve the above existing problems, people have been seeking an ideal technical solution.

Utility model content

In order to improve the power generation efficiency of the compressed air energy storage system, the technical solution adopted in this utility model is: a crank connecting rod driven isothermal compressed air energy storage power generation system, including a compressed air energy storage device and a control system. The control system uses Controlling the compressed air energy storage device to perform compression energy storage and expansion energy release;

The compressed air energy storage device includes a temperature-controlled liquid piston unit, a graded isothermal compressed air subsystem and a constant pressure gas storage unit. The compressed air energy storage device is connected to the graded isothermal compressed air subsystem through a pipeline; the temperature-controlled liquid piston The unit is used for round-trip liquid transmission with the hierarchical isothermal compressed air subsystem, and the hierarchical isothermal compressed air subsystem is used for round-trip gas transmission with the constant pressure gas storage unit;

The hierarchical isothermal compressed air subsystem includes a multi-stage isothermal liquid piston device. Each stage of the isothermal liquid piston device includes two gas-liquid heat exchange tower tanks. The top and bottom of each gas-liquid heat exchange tower tank pass through a three-way water valve respectively. Connected to the temperature-controlled liquid piston unit, each gas-liquid heat exchange tower tank is equipped with a three-way air valve on the top and bottom respectively. The three-way air valve on the top of each gas-liquid heat exchange tower tank is connected to the next-stage gas-liquid heat exchanger tank through a connecting pipe. The three-way air valve at the bottom of the exchange tower tank is connected, and the three-way air valve at the top of the last stage gas-liquid heat exchange tower tank is connected with the constant pressure gas storage unit;

The temperature-controlled liquid piston unit includes a permanent magnet three-phase synchronous motor, a piston connecting rod, a crank connecting rod and a multi-stage hydraulic piston device. The multi-stage hydraulic piston device is connected to the piston connecting rod and the crank connecting rod through the piston connecting rod and the crank connecting rod. The permanent magnet three-phase synchronous motor is synchronously connected for transmission; the hydraulic piston device at each stage includes a hydraulic cylinder and a piston block that divides the hydraulic cylinder into two piston chambers on the left and right, and the top of each piston chamber passes through the upper one-way The valve group is connected to the top of the gas-liquid heat exchange tower tank, and the bottom of each piston cavity is connected to the bottom of the gas-liquid heat exchange tower tank through a lower one-way valve group.

Based on the above, the constant pressure gas storage unit includes a constant pressure liquid tower tank and a constant pressure gas storage tank connected through a ventilation pipe. The constant pressure gas storage tank exchanges heat with the last stage of gas and liquid through the first gas valve. The three-way vent valve on the top of the tower tank is connected.

Based on the above, a second air valve is provided on the connecting pipe.

Based on the above, in order to facilitate the stroke limitation of the crank connecting rod, a limit switch is provided on the crank connecting rod.

Based on the above, the control system includes a CPU module, a digital input and output module, an analog input module and a communication module. The CPU module is connected to the digital input and output module, the analog input module and the communication module respectively. connected.

Based on the above, the gas-liquid heat exchange tower tank, the constant pressure liquid tower tank and the constant pressure gas storage tank gas-liquid heat exchange tower tank are provided with a temperature-pressure integrated sensor and a liquid level sensor. The temperature-pressure integrated sensor The sensor and the liquid level sensor are respectively connected to the control system.

The utility model has substantial features and improvements compared with the existing technology. Specifically, the utility model provides a crank connecting rod driven isothermal compressed air energy storage power generation system. When storing energy, the PLC controls a permanent magnet three-phase synchronous motor to be used as a motor. , driving the crank connecting rod to reciprocate, the heat generated by gas compression in the temperature-controlled liquid piston unit is absorbed by the liquid, turning adiabatic compression into isothermal compression, and compressing the gas step by step to the constant pressure gas storage unit, constant pressure gas storage The original liquid in the tank is squeezed by the gas into the constant pressure container tower tank, ensuring that the gas in the constant pressure gas storage tank always maintains a constant pressure during the compression process.

When releasing energy, the liquid in the constant pressure container tower tank enters the constant pressure gas storage tank to ensure constant pressure power generation during the energy release stage. The gas expands step by step from the constant pressure gas storage unit. The heat required for gas expansion in the temperature-controlled liquid piston unit Obtained from the liquid during compression, the expansion drives the connecting rod to reciprocate.

Compared with existing screw air compressors and expanders, this system sends energy storage and energy release work instructions to the PLC through the remote end. The PLC collects the system's temperature, pressure, liquid level, piston position and other information. The crank connecting rod controls the working status of the permanent magnet three-phase synchronous motor and the on-off status of the valve, thereby realizing isothermal compression and expansion of air. Since the permanent magnet three-phase synchronous motor directly drives the crank connecting rod to move, it is a purely mechanical transmission and does not It requires the use of air for transmission, thereby reducing system costs, improving system energy efficiency, and thereby improving the power generation efficiency of the compressed air energy storage system.

Description of drawings

Figure 1 is a schematic diagram of the structural connection relationship of the crank connecting rod driven isothermal compressed air energy storage power generation system provided by the utility model.

Figure 2 is a partial structural schematic diagram of the crank connecting rod driven isothermal compressed air energy storage power generation system provided by the utility model.

Figure 3 is a schematic diagram of the operation logic of the crank connecting rod driven isothermal compressed air energy storage power generation system provided by the utility model.

In the picture: 1. Left gas-liquid heat exchange tower tank; 2. Upper three-way water valve; 3. Upper three-way air valve; 4. Right gas-liquid heat exchange tower tank; 5. Connecting pipes; 6. Constant pressure liquid tower tank ; 7. Permanent magnet three-phase synchronous motor; 8. Constant pressure gas storage tank; 9. First air valve; 10. Gas pipeline; 11. Upper left single-way water valve; 12. Hydraulic cylinder; 13. Lower left single-way Water valve; 14. Lower three-way water valve; 15. Lower three-way air valve; 16. Lower right single water valve; 17. Upper right single water valve; 18. Primary hydraulic piston cylinder unit; 19. Secondary hydraulic piston Cylinder unit; 20. Three-stage hydraulic piston cylinder unit; 21. Second air valve; 22. Third air valve; 23. Piston connecting rod; 24. Crank connecting rod.

Detailed ways

The technical solution of the present invention will be described in further detail below through specific implementation modes.

Example 1

This embodiment provides a crank-connecting rod driven isothermal compressed air energy storage power generation system, as shown in Figures 1, 2, and 3, including a compressed air energy storage device and a control system, and the control system is used to control the compression The air energy storage device performs compression energy storage and expansion energy release.

Specifically, as shown in Figure 1, the compressed air energy storage device includes a temperature-controlled liquid piston unit, a graded isothermal compressed air subsystem and a constant pressure gas storage unit.

The compressed air energy storage device is connected to the hierarchical isothermal compressed air subsystem through pipelines. The temperature-controlled liquid piston unit is used for liquid transfer back and forth with the hierarchical isothermal compressed air subsystem, and the hierarchical isothermal compressed air subsystem is used for gas transfer back and forth with the constant pressure gas storage unit.

Specifically, as shown in Figure 2, the hierarchical isothermal compressed air subsystem includes a three-stage isothermal liquid piston device.

Each stage of the isothermal liquid piston device includes two gas-liquid heat exchange tower tanks, which can be divided into left gas-liquid heat exchange tower tank 1 and right gas-liquid heat exchange tower tank 4 according to their positions.

The top and bottom of each gas-liquid heat exchange tower tank are connected to the temperature-controlled liquid piston unit through a three-way water valve. Three-way vent valves are provided at the top and bottom of each gas-liquid heat exchange tower tank. The three-way air valve at the top of each stage of gas-liquid heat exchange tower tank is connected to the three-way air valve at the bottom of the next stage of gas-liquid heat exchange tower tank through connecting pipe 5, and the three-way air valve at the top of the last stage gas-liquid heat exchange tower tank passes through The gas transmission pipeline 10 is connected to the constant pressure gas storage unit.

Among them, according to the installation position, the three-way air valve can be divided into an upper three-way air valve 3 and a lower three-way air valve 15. The three-way water valve can be divided into an upper three-way water valve 2 and a lower three-way water valve 14.

The temperature-controlled liquid piston unit includes a permanent magnet three-phase synchronous motor 7, a piston connecting rod 23, a crank connecting rod 24 and a three-stage hydraulic piston device. The three-stage hydraulic piston device is synchronously connected and driven with the permanent magnet three-phase synchronous motor 7 through the piston connecting rod 23 and the crank connecting rod 24 .

Each stage of the hydraulic piston device includes a hydraulic cylinder 12 and a piston block that divides the hydraulic cylinder 12 into two left and right piston chambers. The top of each piston cavity is connected to the top of the gas-liquid heat exchange tower tank through an upper one-way valve group, and the bottom of each piston cavity is connected to the gas-liquid heat exchange tower through a lower one-way valve group. The bottom of the tank is connected.

Specifically, according to the installation position, the three-stage hydraulic piston device can be divided into a first-stage hydraulic piston cylinder unit 18, a second-stage hydraulic piston cylinder unit 19 and a third-stage hydraulic piston cylinder unit 20.

Specifically, according to the installation position, the upper one-way valve group can be divided into an upper left single water valve 11 and an upper right single water valve 17, and the lower one-way valve group can be divided into a lower left single water valve 13 and a lower right single water valve. 16.

Specifically, the constant pressure gas storage unit includes a constant pressure liquid tower tank 6 and a constant pressure gas storage tank 8 that are connected through a ventilation pipe. The constant pressure gas storage tank 8 is connected to the three-way gas valve on the top of the last stage gas-liquid heat exchange tower tank through the first gas valve 9 and the gas transmission pipeline 10.

The connecting pipe 5 is provided with a second air valve 21 . Among them, a second air valve 21 and a third air valve 22 are provided on the connecting pipe between the second-stage isothermal liquid piston device and the third-stage isothermal liquid piston device.

Specifically, in this embodiment, in order to facilitate the stroke limitation of the crank connecting rod 24, a limit switch is provided on the crank connecting rod 24. The control system includes a CPU module, a digital input and output module, an analog input module and a communication module. The CPU module is connected to the digital input and output module, the analog input module and the communication module respectively.

Specifically, the permanent magnet three-phase synchronous motor is used as a motor in the energy storage stage and as a generator in the energy release stage. The crank connecting rod is a large gear mechanism. The energy storage stage converts rotational motion into reciprocating motion, and the energy release stage converts reciprocating motion. for rotational motion.

Example 2

This embodiment provides a crank-connecting rod driven isothermal compressed air energy storage power generation system. The difference between the specific structure and Embodiment 1 is that: in this embodiment, the gas-liquid heat exchange tower tank, the constant pressure liquid tower tank and The gas-liquid heat exchange tower tank of the constant pressure gas storage tank is provided with an integrated temperature and pressure sensor and a liquid level sensor, and the integrated temperature and pressure sensor and the liquid level sensor are respectively connected to the control system.

Specifically, the specific working process of the crank-connecting rod-driven isothermal compressed air energy storage power generation system is as follows:

When storing energy, all three left gas-liquid heat exchange tower tanks 1 in the gas-liquid heat exchange tower tank are filled with gas respectively, and all three right gas-liquid heat exchange tower tanks 4 in the gas-liquid heat exchange tower tank are filled with liquid respectively. .

Under the action of the permanent magnet three-phase synchronous motor and the crank connecting rod, the piston block is pushed to reciprocate. At the same time, the control system reads the limit switch status to determine the position of the piston block. This in turn changes the action of the one-way valve in the temperature-controlled liquid piston unit.

Specifically, when the piston block moves to the left, the upper left single water valve 11 and the lower right single water valve 16 are opened, and the upper right single water valve 17 and the lower left single water valve 13 are closed.

When the piston block moves to the right, the upper left single water valve 11 and the lower right single water valve 16 are closed, and the upper right single water valve 17 and the lower left single water valve 13 are opened. The liquid in the three right gas-liquid heat exchange tower tanks 4 is transferred to the three left gas-liquid heat exchange tower tanks 1 via three hydraulic cylinders.

When the gas in the three left gas-liquid heat exchange tower tanks 1 is compressed, it migrates to the constant pressure gas storage tank 8 through the first gas valve 9, the second gas valve 21 and the third gas valve 22. Until all the liquids in the three right gas-liquid heat exchange tower tanks 4 are transferred to the three left gas-liquid heat exchange tower tanks 1 .

Afterwards, under the action of the permanent magnet three-phase synchronous motor + crank connecting rod, the piston block continues to reciprocate. Change the status of the upper and lower three-way water valves and the upper and lower three-way air valves, so that the liquid in the three right gas-liquid heat exchange tower tanks 4 is transferred to the three left gas-liquid heat exchange tower tanks 1, and the three right gas-liquid heat exchange tower tanks 1 The gas in the liquid heat exchange tower tank 4 is compressed and migrated to the constant pressure gas storage tank.

At the same time, the PLC controls the volume of gas entering the constant pressure gas storage tank to be consistent with the volume of liquid discharged from the constant pressure gas storage tank to the constant pressure liquid tower tank, ensuring constant pressure in the constant pressure gas storage tank.

This goes back and forth until the gas content and pressure of the constant pressure gas storage tank meet the requirements. The energy release process has the same principle as energy storage. In the energy release process, the PLC controls the expansion of the gas in the constant pressure gas tank and the movement of the piston block to drive the permanent magnet three-phase synchronous motor to generate electricity.

Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention and not to limit it; although the present utility model has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that: The specific implementation manner of the present utility model can be modified or some technical features can be equivalently replaced; without departing from the spirit of the technical solution of the present utility model, they should all be included in the scope of the technical solution claimed by the present utility model.

Claims (6)

1. A crank-connecting rod driven isothermal compressed air energy storage power generation system, characterized by: including a compressed air energy storage device and a control system. The control system is used to control the compressed air energy storage device to perform compression, energy storage and expansion. release energy; The compressed air energy storage device includes a temperature-controlled liquid piston unit, a graded isothermal compressed air subsystem and a constant pressure gas storage unit. The compressed air energy storage device is connected to the graded isothermal compressed air subsystem through a pipeline; the temperature-controlled liquid piston The unit is used for round-trip liquid transmission with the hierarchical isothermal compressed air subsystem, and the hierarchical isothermal compressed air subsystem is used for round-trip gas transmission with the constant pressure gas storage unit; The hierarchical isothermal compressed air subsystem includes a multi-stage isothermal liquid piston device. Each stage of the isothermal liquid piston device includes two gas-liquid heat exchange tower tanks. The top and bottom of each gas-liquid heat exchange tower tank pass through a three-way water valve respectively. Connected to the temperature-controlled liquid piston unit, each gas-liquid heat exchange tower tank is equipped with a three-way air valve on the top and bottom respectively. The three-way air valve on the top of each gas-liquid heat exchange tower tank is connected to the next-stage gas-liquid heat exchanger tank through a connecting pipe. The three-way air valve at the bottom of the exchange tower tank is connected, and the three-way air valve at the top of the last stage gas-liquid heat exchange tower tank is connected with the constant pressure gas storage unit; The temperature-controlled liquid piston unit includes a permanent magnet three-phase synchronous motor, a piston connecting rod, a crank connecting rod and a multi-stage hydraulic piston device. The multi-stage hydraulic piston device is connected to the piston connecting rod and the crank connecting rod through the piston connecting rod and the crank connecting rod. The permanent magnet three-phase synchronous motor is synchronously connected for transmission; the hydraulic piston device at each stage includes a hydraulic cylinder and a piston block that divides the hydraulic cylinder into two piston chambers on the left and right, and the top of each piston chamber passes through the upper one-way The valve group is connected to the top of the gas-liquid heat exchange tower tank, and the bottom of each piston cavity is connected to the bottom of the gas-liquid heat exchange tower tank through a lower one-way valve group. 2. The crank-connecting rod driven isothermal compressed air energy storage power generation system according to claim 1, characterized in that: the constant pressure gas storage unit includes a constant pressure liquid tower tank and a constant pressure gas storage tank connected through a ventilation pipeline. , the constant pressure gas storage tank is connected to the three-way gas valve on the top of the last stage gas-liquid heat exchange tower tank through the first gas valve. 3. The crank-connecting rod driven isothermal compressed air energy storage power generation system according to claim 2, characterized in that: the connecting pipe is provided with a second air valve. 4. The crank-connecting rod-driven isothermal compressed air energy storage power generation system according to claim 3, characterized in that: a limit switch is provided on the crank-connecting rod. 5. The crank-connecting rod driven isothermal compressed air energy storage power generation system according to any one of claims 1 to 4, characterized in that: the control system includes a CPU module, a digital input and output module, an analog input module and a communication module, the CPU module is connected to the digital input and output module, the analog input module and the communication module respectively. 6. The crank-connecting rod driven isothermal compressed air energy storage power generation system according to claim 2, characterized in that: the gas-liquid heat exchange tower tank, the constant pressure liquid tower tank and the constant pressure gas storage tank gas The liquid heat exchange tower tank is equipped with a temperature-pressure integrated sensor and a liquid level sensor, and the temperature-pressure integrated sensor and the liquid level sensor are respectively connected to the control system.