Turbine power generation system

Abstract

The application provides a turbine power generation system, comprising at least one power generation device, the power generation device comprising a linear compressor, a regenerative device, a heater, a turbine expander, a rotary motor and a cooler connected in sequence; wherein the linear compressor has a compression cavity, the compression cavity is respectively provided with an air inlet and an air outlet, the air outlet is connected with the regenerative device, the air inlet is connected with the cooler, and a one-way valve is arranged at the air inlet and the air outlet. The turbine power generation system provided by the application aims to solve the problems of large volume, limited single machine pressure ratio, low efficiency and specific power of traditional small and medium-sized power generation systems.

Description

Technical Field

[0001] This invention relates to the field of power generation system technology, and more particularly to a turbine power generation system. Background Technology

[0002] An ideal Brayton cycle consists of four reversible processes: adiabatic compression, isobaric heating, adiabatic expansion, and isobaric exothermic reaction. Existing Brayton cycle engines are primarily used in conjunction with gas turbines. Air enters the compressor, is compressed to a certain pressure, and is then sent to the combustion chamber, where it undergoes combustion with injected fuel. Secondary cooled air then permeates through the channel walls and mixes with the high-temperature combustion gas, lowering the mixture to a suitable temperature before it enters the gas turbine. Inside the gas turbine, the mixture first expands in the nozzle formed by the stationary blades, converting thermal energy into kinetic energy and creating a high-speed airflow. This airflow then rushes into the moving blades, driving the rotor and outputting mechanical work. Part of the work done by the gas turbine drives the compressor, and the remainder is output. The exhaust gas from the gas turbine enters the atmosphere, releasing heat and completing the entire cycle. Therefore, the actual cycle of a gas turbine is open and irreversible.

[0003] In addition, there is a closed-loop gas turbine unit, which typically uses helium as the working fluid. During operation, the helium is compressed and pressurized in the compressor, then sent to the heater for constant-pressure heating. The high-temperature helium then expands and performs work inside the turbine, driving the compressor and outputting effective work. This type of unit uses external heating, thus allowing for greater flexibility in the choice of fuel, but mechanical friction losses still limit some efficiency improvements.

[0004] However, the efficiency of the Brayton cycle is closely related to the pressure ratio, and traditional Brayton heat engines often use centrifugal and axial compressors. Single-stage compressors are not easy to achieve a large pressure ratio, so the efficiency of the heat engine is limited. To achieve a higher pressure ratio, the number of compressor stages must be increased, which requires a larger volume, resulting in a low power density of the entire system. Summary of the Invention

[0005] This invention provides a turbine power generation system to solve the problems of large size and low efficiency in small and medium power generation systems.

[0006] To address the problems existing in the prior art, this invention provides a turbine power generation system, including at least one power generation device. The power generation device includes a linear compressor, a regenerator, a heater, a turbine expander, a rotary motor, and a cooler connected in sequence. The turbine expander is driven by the rotary motor.

[0007] The linear compressor has a compression chamber, which is provided with an air inlet and an air outlet. The air outlet is connected to a regenerating device, and the air inlet is connected to a cooler. Both the air inlet and the air outlet are provided with a one-way valve.

[0008] According to the turbine power generation system provided by the present invention, the linear compressor has a compression chamber at each end in the length direction.

[0009] According to the turbine power generation system provided by the present invention, the linear compressor includes a housing, a piston, and an electric motor assembly. The piston and the electric motor assembly are both disposed within the housing, and the piston is movably disposed through the electric motor assembly. Two compression chambers are formed at both ends of the piston in the length direction.

[0010] According to the turbine power generation system provided by the present invention, the housing includes a back cavity spaced apart from the two compression chambers, and the motor assembly is disposed within the back cavity;

[0011] The motor assembly includes an outer stator, an inner stator, and a mover. The mover is mounted on the piston rod of the piston and is located between the outer stator and the inner stator.

[0012] According to the turbine power generation system provided by the present invention, the power generation device includes two devices, which are symmetrically arranged in the horizontal direction so that the two linear compressors are arranged opposite each other.

[0013] According to the turbine power generation system provided by the present invention, the circulating working fluid of the power generation device includes helium.

[0014] According to the turbine power generation system provided by the present invention, the rotating motor is electrically connected to the motor assembly.

[0015] The turbine power generation system provided by this invention can improve the performance of the compressor and the efficiency of the Brayton cycle. The free piston structure of the linear compressor reduces lateral friction, improving the system's lifespan and reliability; the positive displacement compressor has a higher cycle boost ratio than a single-unit axial compressor, improving the efficiency of the Brayton cycle; the rotary motor has higher power generation efficiency; and the closed-loop system supports different types and structures of heat sources, improving the system's applicability. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in this invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the structure of the first embodiment of the turbine power generation system provided by the present invention;

[0018] Figure 2 This is a schematic diagram of the structure of the second embodiment of the turbine power generation system provided by the present invention.

[0019] Reference numerals: 1: Turbine power generation system; 2: Power generation device; 3: Linear compressor; 4: Cooler; 5: Regenerator; 6: Turbine expander; 7: Rotary motor; 8: Heater; 9: Compression chamber; 10: Inlet; 11: Outlet; 12: Check valve; 13: Housing; 14: Piston; 15: Motor assembly; 16: Back chamber; 17: Piston rod; 18: Outer stator of the motor; 19: Inner stator of the motor; 20: Mover of the motor. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this invention. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort are within the scope of protection of this invention.

[0021] In the description of the embodiments of the present invention, it should be noted that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of the present invention. In addition, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0022] In the description of the embodiments of the present invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of the present invention based on the specific circumstances.

[0023] In embodiments of the present invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0024] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0025] The following is combined with Figures 1-2 The present invention describes a turbine power generation system 1.

[0026] Existing Brayton cycle processes mainly employ the structure of axial or centrifugal compressors. The single-stage pressure ratio of such compressors is limited, and to achieve a higher pressure ratio, the number of compressors must be increased, which requires a larger volume and results in low power density of the entire system.

[0027] To address the problems existing in the prior art, the present invention provides a turbine power generation system 1, including at least one power generation device 2. The specific number of power generation devices 2 can be determined according to the design requirements of actual applications, and the present invention does not limit this number. In the technical solution provided by the present invention, the power generation device 2 includes a linear compressor 3, a regeneration device 5, a heater 8, a turbine expander 6, a rotary motor 7, and a cooler 4 connected in sequence. The turbine expander 6 is drivenly connected to the rotary motor 7. The linear compressor 3 has a compression chamber 9, on which an air inlet 10 and an air outlet 11 are respectively opened. The air outlet 11 is connected to the regeneration device 5, and the air inlet 10 is connected to the cooler 4. A one-way valve 12 is provided at both the air inlet 10 and the air outlet 11.

[0028] The working fluid first undergoes an adiabatic compression process in the linear compressor 3. The piston 14 of the linear compressor 3 circulates and compresses the compression chamber 9, generating high-pressure gas that flows out from the outlet 11. Then, the working fluid passes through a gas pipeline, first entering the regenerator 5 for preheating, and then entering the heater 8 for constant-pressure heating. The high-temperature and high-pressure gas then enters the turbine expander 6 for an adiabatic expansion process, driving the turbine to rotate. The turbine transfers mechanical energy from the rotating shaft to the rotary motor 7 to generate electricity. Part of the electrical energy generated by the rotary motor 7 is used to drive the linear compressor, and the other part is used as power output. Finally, the working fluid gas flowing out of the turbine passes through the regenerator 5 and the cooler 4 for a constant-pressure heat release process, thus completing the entire Brayton cycle process.

[0029] It should be noted that, compared to the crank-connecting rod mechanism, the linear compressor 3 of this invention uses a free piston structure with gap sealing, which can reduce the lateral friction loss of the piston 14 and improve the system's lifespan and reliability. Since the main parameters affecting the Brayton cycle efficiency are the adiabatic expansion index and the cycle pressure ratio, this positive displacement linear compressor 3 has a higher pressure ratio than a single-unit axial compressor, which is beneficial to improving the Brayton cycle efficiency. Moreover, compared to linear motor power generation, the rotary motor 7 has a higher power generation efficiency. In addition, the heater 8 in the system can be separated from or staggered from the rotary motor 7 body, thereby utilizing different types and forms of heat sources.

[0030] Furthermore, in the technical solution provided by this invention, the linear compressor 3 has a compression chamber 9 at each end in the length direction. Thus, the piston 14 of the linear compressor 3 can cyclically compress the two compression chambers 9 during its reciprocating motion. Alternatively, the two compression chambers 9 can be connected sequentially via an air passage, allowing for staged compression of the circulating working fluid to achieve a higher pressure ratio and thus improve circulation efficiency.

[0031] Specifically, the linear compressor 3 includes a housing 13, a piston 14, and a motor assembly 15. Both the piston 14 and the motor assembly 15 are located within the housing 13, with the piston 14 movably passing through the motor assembly 15. Two compression chambers 9 are formed at both ends of the piston 14 along its length. The housing 13 includes a back cavity 16 spaced apart from the two compression chambers 9, and the motor assembly 15 is located within the back cavity 16. The motor assembly 15 includes an outer stator 18, an inner stator 19, and a mover 20. The mover 20 is located on the piston rod of the piston 14 and between the outer stator 18 and the inner stator 19. The current changes in the coils of the outer stator 18 and the inner stator 19 generate a cyclic electromagnetic effect. Under the action of magnetic force, the mover 20 begins to move, driving the piston rod 17 of the linear compressor 3 to reciprocate, cyclically compressing the compression chambers 9 on both sides.

[0032] It should be noted that the circulating working fluid of the power generation device 2 of the present invention is helium, but other circulating working fluids can also be used, and the present invention does not limit this. As mentioned above, part of the electrical energy generated by the rotary motor 7 is used to drive the linear compressor 3, and the other part is used as power output. Therefore, the rotary motor 7 is electrically connected to the motor assembly 15.

[0033] The system's working principle is roughly as follows: The circulating working fluid first undergoes an adiabatic compression process in the linear compressor 3 to generate high-pressure gas. Then, the working fluid gas enters the regenerator 5 through a gas pipeline for preheating. Next, the working fluid enters the heater 8 for constant-pressure heating. The high-temperature, high-pressure gas enters the turbine expander 6 for adiabatic expansion, driving the turbine to rotate. The turbine transfers mechanical energy from the rotating shaft to the rotary motor 7 to generate electricity. Part of the electrical energy generated by the rotary motor 7 powers the linear compressor 3, and the other part is used as electrical output. Finally, the working fluid gas exiting the turbine passes through the regenerator 5 and cooler 4 for a constant-pressure heat release process, thus completing the entire Brayton cycle process.

[0034] Furthermore, in the technical solution provided by this invention, the power generation device 2 includes two devices, which are symmetrically arranged in the horizontal direction so that the two linear compressors 3 are positioned opposite each other, thereby reducing the noise and vibration of the entire system. Of course, other numbers of power generation devices 2 can be set according to the actual design requirements, and this invention does not limit this.

[0035] This invention provides a turbine power generation system 1 based on a linear compressor 3. In this system, the circulating working fluid undergoes a Brayton cycle and outputs electricity. The entire system is driven by thermal energy, generating electrical energy at the turbine expander 6 and rotary motor 7. Part of the generated electrical energy is used to drive the linear compressor 3, and the other part is used for power output. The free-piston linear compressor 3 reduces the lateral friction loss of the piston 14. Furthermore, the positive displacement linear compressor 3 has a higher pressure ratio than other types of single-unit compressors. Therefore, the entire system improves the efficiency, lifespan, and reliability of the Brayton cycle, and has certain application prospects.

[0036] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A turbogenerative system characterized by, The power generation device comprises at least one power generation device, and the power generation device comprises a linear compressor, a regenerative device, a heater, a turbine expander, a rotary motor and a cooler connected in sequence, and the turbine expander is drivingly connected with the rotary motor. The linear compressor has a compression cavity, and the compression cavity is respectively provided with an air inlet and an air outlet, the air outlet is connected with the regenerative device, the air inlet is connected with the cooler, and a one-way valve is arranged at the air inlet and the air outlet. The power generation device comprises two power generation devices, and the two power generation devices are symmetrically arranged along the horizontal direction, so that the two linear compressors are arranged opposite to each other.

2. The turbine power generation system of claim 1, wherein The linear compressor has one compression cavity at each end in the length direction.

3. The turbine power generation system of claim 2, wherein The linear compressor comprises a shell, a piston and a motor assembly, the piston and the motor assembly are arranged in the shell, the piston is movably arranged in the motor assembly, and two compression cavities are formed at both ends of the piston in the length direction.

4. The turbine power generation system of claim 3, wherein The shell comprises a back cavity arranged in the shell and spaced apart from the two compression cavities, and the motor assembly is arranged in the back cavity. The motor assembly comprises an outer motor stator, an inner motor stator and a motor rotor, the motor rotor is arranged on a piston rod of the piston and located between the outer motor stator and the inner motor stator.

5. The turbine power generation system of claim 1, wherein The circulating working medium of the power generation device comprises helium.

6. The turbine power generation system of claim 3, wherein The rotary motor is electrically connected with the motor assembly.

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