Free piston stirling generator system based on non-resonant self-recuperative heat exchanger

Abstract

The application provides a free piston Stirling power generation system based on a non-resonant self-circulation heat exchanger, and belongs to the field of thermal power generation.The free piston Stirling power generation system comprises a free piston Stirling generator, a heat exchanger, a first one-way control unit and a second one-way control unit.The first one-way control unit, the second one-way control unit, the free piston Stirling generator and the heat exchanger are connected through pipelines to form a circulation passage.The first one-way control unit and the second one-way control unit are respectively arranged at the air inlet end and the air outlet end of the free piston Stirling generator, and are used for realizing one-way air inlet or one-way air outlet.The free piston Stirling power generation system realizes one-way air inlet or one-way air outlet of the free piston Stirling generator, avoids the fluctuation of the gas in the pipeline along with the pressure fluctuation in the free piston Stirling generator, thereby reducing the sound work loss in the pipeline and improving the power generation efficiency of the system.In addition, the two one-way control units can be ensured to work in the allowable temperature range by introducing the counter-flow heat exchanger.

Description

Technical Field

[0001] This invention relates to the field of thermal power generation technology, and in particular to a free piston Stirling power generation system based on a non-resonant self-circulating heat exchanger. Background Technology

[0002] The free-piston Stirling generator is a novel, highly efficient, and long-life thermoelectric conversion device. It consists of a free-piston Stirling engine coupled with a linear oscillating motor. Through the thermoacoustic effect, it converts thermal energy into acoustic energy generated by the reciprocating oscillation of a compressible fluid, which drives a power piston to move a magnet, reciprocatingly cutting magnetic lines of force to produce alternating current. With the increasing demands of space exploration, the free-piston Stirling generator has gained increasing attention due to its high efficiency, high reliability, and long lifespan. Free-piston Stirling generators typically use inert gases such as helium as their internal working fluid and are external combustion heat engines, possessing extremely wide applicability to heat sources, including nuclear heat, solar energy, industrial waste heat, and fuel combustion.

[0003] However, in existing free-piston Stirling power generation systems, the introduction of external heat transfer cycles (molten salt, liquid metal, etc.) not only increases the system's complexity and operating costs, but the corrosion problems caused by liquid metal also severely restrict the material selection and structural design of the generator's heat head pressure shell. While resonant self-circulating heat exchangers can utilize internal helium as the working fluid to complete the external heat transfer cycle without considering the material compatibility between liquid metal and the pressure-bearing structure, the resonant characteristics require a long external loop length and fluctuating pressure within the pipes. Consequently, acoustic power loss in the heat transfer loop is severe, significantly reducing the system's power generation efficiency. Summary of the Invention

[0004] This invention provides a free piston Stirling power generation system based on a non-resonant self-circulating heat exchanger, which solves the defects of the prior art where the resonant self-circulating heat exchanger requires a long external loop length and there are fluctuating pressures in the pipe, resulting in severe acoustic power loss in the heat transfer loop and greatly reducing the power generation efficiency of the system.

[0005] This invention provides a free piston Stirling power generation system based on a non-resonant self-circulating heat exchanger, comprising a free piston Stirling generator, a heat exchanger, a first unidirectional control unit, and a second unidirectional control unit. The first unidirectional control unit, the second unidirectional control unit, the free piston Stirling generator, and the heat exchanger are connected by a pipe to form a circulation path. The first unidirectional control unit and the second unidirectional control unit are respectively located at the air inlet and air outlet of the free piston Stirling generator to realize unidirectional air inlet or outlet.

[0006] According to the present invention, a free piston Stirling generator system based on a non-resonant self-circulating heat exchanger is provided. The free piston Stirling generator includes a compression chamber and an expansion chamber. A first one-way control unit is located at the outlet end of the compression chamber, with one end connected to the compression chamber and the other end connected to the inlet end of the heat exchanger through a pipe. A second one-way control unit is located with one end near the expansion chamber and the other end near the compression chamber. Both ends of the second one-way control unit are connected to the compression chamber through pipes.

[0007] According to the present invention, a free piston Stirling power generation system based on a non-resonant self-circulating heat exchanger is provided, wherein the outlet end of the heat exchanger is connected to a position near the expansion chamber via a pipe, isolating it from the expansion chamber and communicating with the compression chamber.

[0008] According to the present invention, a free piston Stirling power generation system based on a non-resonant self-circulating heat exchanger is provided, which further includes a counter-flow heat exchanger. The heat exchanger is disposed outside the pipes corresponding to the first unidirectional control unit and the second unidirectional control unit, so that the pipes corresponding to the first unidirectional control unit and the second unidirectional control unit can exchange heat.

[0009] According to the present invention, a free piston Stirling power generation system based on a non-resonant self-circulating heat exchanger is provided, wherein the pipes corresponding to the first unidirectional control unit and the second unidirectional control unit are in a bent state.

[0010] According to the present invention, a free piston Stirling generator system based on a non-resonant self-circulating heat exchanger is provided. The free piston Stirling generator includes a compression chamber, a mixing chamber, and an expansion chamber, wherein the compression chamber and the expansion chamber are connected through the mixing chamber; one end of a first unidirectional control unit is connected to the mixing chamber, and the other end is connected to the air inlet of the heat exchanger through a pipe; one end of a second unidirectional control unit is connected to the mixing chamber, and the other end is connected to the air outlet of the heat exchanger through a pipe.

[0011] According to the present invention, a free piston Stirling power generation system based on a non-resonant self-circulating heat exchanger is provided, wherein the mixing chamber is located near the expansion chamber.

[0012] According to the present invention, a free piston Stirling power generation system based on a non-resonant self-circulating heat exchanger further includes a heat source that provides heat to the heat exchanger through a pipe.

[0013] According to the present invention, a free piston Stirling power generation system based on a non-resonant self-circulating heat exchanger is provided, wherein the heat source includes a nuclear reactor, a gas turbine, a boiler, or a waste heat recovery device.

[0014] According to the present invention, a free piston Stirling power generation system based on a non-resonant self-circulating heat exchanger is provided, wherein both the first unidirectional control unit and the second unidirectional control unit include a unidirectional valve, and the opening degree of the unidirectional valve is positively correlated with the heating amount of the free piston Stirling generator.

[0015] The free piston Stirling power generation system based on a non-resonant self-circulating heat exchanger provided by this invention achieves unidirectional air intake or unidirectional air output of the free piston Stirling generator by setting a first unidirectional control unit and a second unidirectional control unit at the air intake and air outlet ends of the free piston Stirling generator, respectively. This avoids the gas inside the pipeline fluctuating with the pressure fluctuation inside the free piston Stirling generator, thereby reducing the acoustic power loss in the pipeline and improving the power generation efficiency of the system. In addition, a counter-flow heat exchanger can be introduced to ensure that both unidirectional control units operate within the allowable temperature range. 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 one of the structural schematic diagrams of the free piston Stirling power generation system based on a non-resonant self-circulating heat exchanger provided by the present invention;

[0018] Figure 2 This is the second schematic diagram of the free piston Stirling power generation system based on a non-resonant self-circulating heat exchanger provided by the present invention;

[0019] Figure 3 This is the third schematic diagram of the free piston Stirling power generation system based on a non-resonant self-circulating heat exchanger provided by the present invention.

[0020] Figure label:

[0021] 1-Heat exchanger, 2-First unidirectional control unit, 3-Second unidirectional control unit, 4-Free piston Stirling generator, 401-Leaf spring, 402-Back cavity, 403-Power piston, 404-Linear motor, 405-Expansion chamber, 406-Compression chamber, 407-Piston rod, 408-Low-temperature heat exchanger, 409-Phase adjuster, 410-Regenerator, 411-High-temperature heat exchanger, 412-Mixing chamber, 5-Counterflow heat exchanger, 6-Drive pump, 7-Heat source, 8-Exhaust gas processor. Detailed Implementation

[0022] 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.

[0023] In the description of the embodiments of this application, 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 this application 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 this application. 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.

[0024] In the description of the embodiments of this application, 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 this application based on the specific circumstances.

[0025] In the embodiments of this application, unless otherwise expressly 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.

[0026] 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 embodiments of this application. 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.

[0027] The following is in conjunction with the instruction manual appendix. Figure 1-3 The present invention will be described in detail below.

[0028] like Figure 1-3 As shown, the present invention provides a non-resonant self-circulating heat exchanger, including a heat exchanger 1, a first unidirectional control unit 2 and a second unidirectional control unit 3, wherein the heat exchanger 1, the first unidirectional control unit 2 and the second unidirectional control unit 3 form a heat exchange loop.

[0029] Optionally, the non-resonant self-circulating heat exchanger also includes a counter-flow heat exchanger 5, which is used to realize heat exchange between the first unidirectional control unit 2 and the second unidirectional control unit 3.

[0030] The application of non-resonant self-circulating heat exchangers is not limited to the free piston Stirling generator 4, but is also applicable to other regenerative heat engines with different structural forms, including thermoacoustic engines, Stirling heat pumps, etc., which will not be elaborated here.

[0031] The present invention will now be illustrated by an example of a free piston Stirling power generation system.

[0032] This invention provides a free piston Stirling power generation system based on a non-resonant self-circulating heat exchanger, including a free piston Stirling generator 4, a heat exchanger 1, a first unidirectional control unit 2, and a second unidirectional control unit 3. The first unidirectional control unit 2, the second unidirectional control unit 3, the free piston Stirling generator 4, and the heat exchanger 1 are connected by a pipe to form a circulation path. The first unidirectional control unit 2 and the second unidirectional control unit 3 are respectively located at the air inlet and air outlet of the free piston Stirling generator 4 to realize unidirectional air inlet or outlet.

[0033] Specifically, the first one-way control unit 2 and the second one-way control unit 3 are used to ensure that the gas in the pipeline can only move in a preset direction.

[0034] Optionally, the pipe in this invention is a high-pressure helium heat transfer pipe.

[0035] It is understood that by setting a first one-way control unit 2 and a second one-way control unit 3 at the inlet and outlet ends of the free piston Stirling generator 4 respectively, the present invention realizes one-way air intake or one-way air output of the free piston Stirling generator 4, avoiding the gas inside the pipeline fluctuating with the pressure fluctuation inside the free piston Stirling generator 4, thereby reducing the acoustic power loss in the pipeline and improving the power generation efficiency of the system.

[0036] The present invention will be described in detail below with reference to several embodiments.

[0037] Example 1

[0038] Figure 1 This is one of the structural schematic diagrams of the free piston Stirling power generation system based on a non-resonant self-circulating heat exchanger provided by the present invention, as shown below. Figure 1 As shown, based on the above embodiments, as an optional embodiment, the free piston Stirling generator 4 includes a compression chamber 406 and an expansion chamber 405. A first one-way control unit 2 is located at the outlet end of the compression chamber 406, with one end connected to the compression chamber 406 and the other end connected to the inlet end of the heat exchanger 1 through a pipe. A second one-way control unit 3 is located with one end near the expansion chamber 405 and the other end near the compression chamber 406. Both ends of the second one-way control unit 3 are connected to the compression chamber 406 through pipes.

[0039] Optionally, the free-piston Stirling generator 4 internally includes a leaf spring 401, a back cavity 402, a power piston 403, a linear motor 404, an expansion cavity 405, a compression cavity 406, a piston rod 407, a low-temperature heat exchanger 408, a phase adjuster 409, a regenerator 410, and a high-temperature heat exchanger 411. The power piston 403 is connected to the leaf spring 401 via the piston rod 407. The back cavity 402 is located between the leaf spring 401 and the power piston 403. The linear motor 404 is located around the power piston 403. The compression cavity 406 is located between the piston rod 407 and the power piston 403. The low-temperature heat exchanger 408, the regenerator 410, and the high-temperature heat exchanger 411 are arranged sequentially. The phase adjuster 409 is located at the center of the low-temperature heat exchanger 408, the regenerator 410, and the high-temperature heat exchanger 411. The expansion cavity 405 is located on one side of the phase adjuster 409. The phase adjuster is a phase adjuster rod.

[0040] Optionally, both the first one-way control unit 2 and the second one-way control unit 3 can be one-way valves.

[0041] Optionally, the first one-way control unit 2 and the second one-way control unit 3 are positioned close to the compression chamber 406, as the temperature of the compression chamber 406 is lower, which better matches the operating temperature range of the first and second one-way control units 2 and 3. Specifically, the optimal operating temperature range of the one-way valve is no higher than 350°C, while the operating temperature range of the generator is generally higher, typically 650°C or even higher. Therefore, positioning the first and second one-way control units 2 and 3 close to the compression chamber 406 in this invention better matches their operating temperature range.

[0042] Optionally, the high-temperature heat exchanger 411 is a partitioned high-temperature heat exchanger 411, which makes the pipe connected to the outlet end of the heat exchanger 1 connected to the compression chamber 406 and isolated from the expansion chamber 405.

[0043] Optionally, the outlet of the heat exchanger 1 is connected to a position near the expansion chamber 405 via a pipe, which is isolated from the expansion chamber and connected to the compression chamber 406.

[0044] It is understood that this invention utilizes the unidirectional conductivity of the first unidirectional control unit 2 and the second unidirectional control unit 3 to generate a stable time-averaged mass flow of the working gas in the circulation path (i.e., heat exchange loop) within the system. This flow absorbs heat from the heat source 7 through the heat exchanger 1, and then transfers the heat to the working gas (e.g., helium) inside the compression chamber 406 through the indirect-contact high-temperature heat exchanger 411. Finally, the conversion of thermal energy into acoustic power is achieved in the regenerator 410. In this embodiment, the heat exchange loop is directly connected to the compression chamber 406 and circulates using the generator's own working gas (usually high-pressure helium), eliminating the need for additional drive components (e.g., pumps). This eliminates the need for an additional heat exchange loop, reducing system complexity and operating costs. Since high-pressure helium is also used for heat transfer in the external circulation, the generator design does not need to consider the material compatibility between the liquid metal and the pressure-bearing structure of the heat head, greatly reducing the design difficulty of the generator. Furthermore, compared to resonant self-circulating heat exchangers, the heat exchange loop length of non-resonant self-circulating heat exchangers can be arbitrarily arranged according to actual needs. At the same time, since the first unidirectional control unit 2 and the second unidirectional control unit 3 block the pressure fluctuation of the compression chamber 406 from affecting the pressure of the pipeline, the acoustic power loss in the pipeline is greatly reduced. Moreover, the introduction of the heat exchange loop will not lead to an increase in the ineffective volume of the generator and thus affect the power generation performance.

[0045] Based on the above embodiments, as an optional embodiment, a counter-flow heat exchanger 5 is also included. The heat exchanger is disposed outside the pipe corresponding to the first unidirectional control unit 2 and the pipe corresponding to the second unidirectional control unit 3, so that the pipe corresponding to the first unidirectional control unit 2 and the pipe corresponding to the second unidirectional control unit 3 can exchange heat.

[0046] Optionally, the pipes corresponding to the first unidirectional control unit 2 and the second unidirectional control unit 3 are bent, which can increase the heat exchange area of ​​the pipes and improve the heat exchange efficiency of the pipes.

[0047] Optionally, the free piston Stirling power generation system based on a non-resonant self-circulating heat exchanger provided by the present invention further includes a drive pump 6 and a heat source 7, wherein the heat source 7 supplies heat to the heat exchanger 1 via the drive pump 6.

[0048] Understandably, during normal system operation, when the internal pressure fluctuation of the generator exceeds the set threshold of the first one-way control unit 2, gas will enter the circulation path. High-pressure helium is heated by heat exchanger 1, and then the heat is transferred to the helium inside the system via the indirect-flow high-temperature heat exchanger 411. Finally, it generates acoustic power in the regenerator 410. After heat release, the gas temperature remains high, so it continues to release heat and cool the lower-temperature helium at the circulation path inlet via the counter-flow heat exchanger 5. Finally, the high-pressure helium, cooled to below the preset temperature, returns to the compression chamber 406 via the second one-way control unit 3. The introduction of the counter-flow heat exchanger 5 also preheats the high-pressure helium at the inlet, which helps improve the system's thermal efficiency.

[0049] Example 2

[0050] Figure 2 This is the second schematic diagram of the free piston Stirling power generation system based on a non-resonant self-circulating heat exchanger provided by the present invention, as shown below. Figure 2 As shown, the free piston Stirling generator 4 includes a compression chamber 406, a mixing chamber 412, and an expansion chamber 405. The compression chamber 406 and the expansion chamber 405 are connected through the mixing chamber 412. One end of the first one-way control unit 2 is connected to the mixing chamber 412, and the other end is connected to the air inlet of the heat exchanger 1 through a pipe. One end of the second one-way control unit 3 is connected to the mixing chamber 412, and the other end is connected to the air outlet of the heat exchanger 1 through a pipe.

[0051] Specifically, unlike Embodiment 1, the free piston Stirling generator 4 in this embodiment includes a leaf spring 401, a back cavity 402, a power piston 403, a linear motor 404, an expansion cavity 405, a compression cavity 406, a piston rod 407, a cryogenic heat exchanger 408, a phase adjuster 409, a regenerator 410, and a mixing cavity 412. The power piston 403 is connected to the leaf spring 401 through the piston rod 407. The back cavity 402 is located between the leaf spring 401 and the power piston 403. The linear motor 404 is located around the power piston 403. The compression cavity 406 is located between the piston rod 407 and the power piston 403. The cryogenic heat exchanger 408, the regenerator 410, and the mixing cavity 412 are arranged sequentially. The phase adjuster 409 is located at the center of the cryogenic heat exchanger 408, the regenerator 410, and the mixing cavity 412. The expansion cavity 405 is located on one side of the phase adjuster 409. Among them, the phase adjuster is the phase adjuster 409Rod rod.

[0052] Optionally, the mixing chamber 412 is located near the expansion chamber 405.

[0053] Specifically, the working principle of this embodiment is the same as that of Embodiment 1. Both utilize the unidirectional conductivity of the first unidirectional control unit 2 and the second unidirectional control unit 3 to generate a constant DC current in the heat exchange loop, achieving coupling heat transfer with the external high-temperature heat source 7. In this embodiment, the air inlet and outlet of the heat exchange loop are located at the high-temperature mixing chamber 412, eliminating the need for a partition-type high-temperature heat exchanger 411 and a counter-current heat exchanger, thus reducing the structural complexity of the system. Furthermore, since the first unidirectional control unit 2 and the second unidirectional control unit 3 are directly located at the mixing chamber 412, the temperature of the high-temperature heat source 7 that the system can couple with is determined based on the operating temperature range of the first unidirectional control unit 2 and the second unidirectional control unit 3.

[0054] It is understood that by setting a first one-way control unit 2 and a second one-way control unit 3 at the inlet and outlet ends of the free piston Stirling generator 4 respectively, the present invention realizes one-way air intake or one-way air output of the free piston Stirling generator 4, avoiding the gas inside the pipeline fluctuating with the pressure fluctuation inside the free piston Stirling generator 4, thereby reducing the acoustic power loss in the pipeline and improving the power generation efficiency of the system.

[0055] Example 3

[0056] Figure 3 This is the third schematic diagram of the free piston Stirling power generation system based on a non-resonant self-circulating heat exchanger provided by the present invention, as shown below. Figure 3 As shown, the free piston Stirling power generation system based on a non-resonant self-circulating heat exchanger provided by the present invention also includes a heat source 7, which provides heat to the heat exchanger 1 through a pipe.

[0057] Optionally, the heat source 7 includes a nuclear reactor, a gas turbine, a boiler, or a waste heat recovery device. Because the non-resonant self-circulating heat exchanger allows the generator's original compact high-temperature heat exchanger 411 to be arranged outside the system, it is easier to obtain sufficient heat transfer area for heat exchange with heat transfer fluids with lower specific heat capacity (e.g., high-temperature flue gas).

[0058] The working principle of this application is the same as that of Embodiments 1 and 2. It utilizes the unidirectional conductivity of the first unidirectional control unit 2 and the second unidirectional control unit 3 to generate a time-averaged DC current in the heat exchange loop, achieving coupling heat transfer with the external high-temperature heat source 7. Taking a gas turbine as an example, the system generates electricity by absorbing the heat from its emitted high-temperature flue gas. Since the heat exchanger 1 can be set large enough in a non-resonant self-circulating heat exchanger, this system can effectively resolve the coupling contradiction between low specific heat capacity fluids (e.g., high-temperature flue gas) and the compact heat exchanger of the Stirling generator, greatly reducing shell-side flow resistance power consumption and improving system performance.

[0059] Optionally, the heat exchanger 1 can also be connected to the exhaust gas processor 8 for the subsequent utilization of exhaust gas and pollution reduction.

[0060] It is understood that by setting a first one-way control unit 2 and a second one-way control unit 3 at the inlet and outlet ends of the free piston Stirling generator 4 respectively, the present invention realizes one-way air intake or one-way air output of the free piston Stirling generator 4, avoiding the gas inside the pipeline fluctuating with the pressure fluctuation inside the free piston Stirling generator 4, thereby reducing the acoustic power loss in the pipeline and improving the power generation efficiency of the system.

[0061] Based on the above embodiments one, two, and three, as an optional embodiment, both the first one-way control unit 2 and the second one-way control unit 3 include a one-way valve, and the opening degree of the one-way valve is positively correlated with the heating amount of the free piston Stirling generator 4. Specifically, the larger the opening degree of the one-way valve, the higher the heating amount of the free piston Stirling generator 4.

[0062] The free piston Stirling power generation system based on a non-resonant self-circulating heat exchanger provided by the present invention achieves unidirectional air intake or unidirectional air exhaust of the free piston Stirling generator 4 by setting a first unidirectional control unit 2 and a second unidirectional control unit 3 at the air intake and air exhaust ends of the free piston Stirling generator 4, respectively. This avoids the gas inside the pipeline fluctuating with the pressure fluctuation inside the free piston Stirling generator 4, thereby reducing the acoustic power loss in the pipeline and improving the power generation efficiency of the system.

[0063] 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 free piston Stirling power system based on a non-resonant self-recirculating heat exchanger, characterized in that, The application relates to a free piston Stirling generator, a heat exchanger, a first one-way control unit and a second one-way control unit, wherein the first one-way control unit, the second one-way control unit, the free piston Stirling generator and the heat exchanger are communicated by pipelines to form a circulating passage, the first one-way control unit and the second one-way control unit are arranged at an air inlet end and an air outlet end of the free piston Stirling generator respectively, and are used for realizing one-way air inlet or air outlet; and the application further relates to a counterflow heat exchanger, which is arranged outside pipelines corresponding to the first one-way control unit and the second one-way control unit, so as to realize heat exchange of the pipelines corresponding to the first one-way control unit and the second one-way control unit, and the counterflow heat exchanger is used for releasing heat to helium at an air inlet of the circulating passage.

2. The non-resonant self-recirculation heat exchanger based free piston Stirling power system according to claim 1, wherein, The free piston Stirling generator comprises a compression cavity and an expansion cavity, the first one-way control unit is arranged at an air outlet end of the compression cavity, one end of the first one-way control unit is communicated with the compression cavity, and the other end of the first one-way control unit is connected with an air inlet end of the heat exchanger through a pipeline; one end of the second one-way control unit is arranged close to the expansion cavity, and the other end of the second one-way control unit is arranged close to the compression cavity, and both ends of the second one-way control unit are communicated with the compression cavity through pipelines.

3. The non-resonant self-recirculation regenerator-based free piston Stirling power system of claim 2, wherein, An air outlet end of the heat exchanger is connected to a position close to the expansion cavity through a pipeline, and the air outlet end of the heat exchanger is blocked from the expansion cavity and is communicated with the compression cavity.

4. The non-resonant self-recirculation heat exchanger based free piston Stirling power system of claim 2, wherein, The pipeline corresponding to the first one-way control unit and the pipeline corresponding to the second one-way control unit are in a curved state.

5. The non-resonant self-recirculation heat exchanger based free piston Stirling power system of claim 1, wherein, The free piston Stirling generator comprises a compression cavity, a mixing cavity and an expansion cavity, the compression cavity and the expansion cavity are communicated through the mixing cavity; one end of the first one-way control unit is communicated with the mixing cavity, and the other end of the first one-way control unit is connected with an air inlet end of the heat exchanger through a pipeline; one end of the second one-way control unit is communicated with the mixing cavity, and the other end of the second one-way control unit is connected with an air outlet end of the heat exchanger through a pipeline.

6. The non-resonant self-recirculation heat exchanger based free piston Stirling power system of claim 5, wherein, The mixing cavity is arranged close to the expansion cavity.

7. The non-resonant self-recirculation heat exchanger based free piston Stirling power system of claim 1, wherein, The application further relates to a heat source, which provides heat for the heat exchanger through a pipeline.

8. The non-resonant self-recirculation heat exchanger based free piston Stirling power system of claim 7, wherein, The heat source comprises a nuclear reactor, a gas turbine, a boiler or a waste heat recovery device.

9. The non-resonant self-recirculating heat exchanger based free piston Stirling power system according to any of claims 1-8, characterized in that, The first one-way control unit and the second one-way control unit both comprise a one-way valve, and the opening degree of the one-way valve is positively correlated with the heating amount of the free piston Stirling generator.

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