CN116398318A - Free piston Stirling power generation system with built-in air compressing device - Google Patents
Free piston Stirling power generation system with built-in air compressing device Download PDFInfo
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- CN116398318A CN116398318A CN202310613247.XA CN202310613247A CN116398318A CN 116398318 A CN116398318 A CN 116398318A CN 202310613247 A CN202310613247 A CN 202310613247A CN 116398318 A CN116398318 A CN 116398318A
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- 238000010248 power generation Methods 0.000 title claims abstract description 53
- 239000001307 helium Substances 0.000 claims abstract description 87
- 229910052734 helium Inorganic materials 0.000 claims abstract description 87
- SWQJXJOGLNCZEY-UHFFFAOYSA-N helium atom Chemical compound [He] SWQJXJOGLNCZEY-UHFFFAOYSA-N 0.000 claims abstract description 87
- 239000007789 gas Substances 0.000 claims abstract description 63
- 230000006835 compression Effects 0.000 claims description 11
- 238000007906 compression Methods 0.000 claims description 11
- 238000002485 combustion reaction Methods 0.000 claims description 7
- 239000000446 fuel Substances 0.000 claims description 3
- 230000004907 flux Effects 0.000 claims 5
- 239000002699 waste material Substances 0.000 claims 1
- 229910001338 liquidmetal Inorganic materials 0.000 abstract description 10
- 150000003839 salts Chemical class 0.000 abstract description 10
- 230000007797 corrosion Effects 0.000 abstract description 5
- 238000005260 corrosion Methods 0.000 abstract description 5
- 230000010355 oscillation Effects 0.000 description 6
- 239000012530 fluid Substances 0.000 description 5
- 230000008878 coupling Effects 0.000 description 3
- 238000010168 coupling process Methods 0.000 description 3
- 238000005859 coupling reaction Methods 0.000 description 3
- 239000002028 Biomass Substances 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000002440 industrial waste Substances 0.000 description 2
- 230000005855 radiation Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000002000 scavenging effect Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02G—HOT GAS OR COMBUSTION-PRODUCT POSITIVE-DISPLACEMENT ENGINE PLANTS; USE OF WASTE HEAT OF COMBUSTION ENGINES; NOT OTHERWISE PROVIDED FOR
- F02G1/00—Hot gas positive-displacement engine plants
- F02G1/04—Hot gas positive-displacement engine plants of closed-cycle type
- F02G1/043—Hot gas positive-displacement engine plants of closed-cycle type the engine being operated by expansion and contraction of a mass of working gas which is heated and cooled in one of a plurality of constantly communicating expansible chambers, e.g. Stirling cycle type engines
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02G—HOT GAS OR COMBUSTION-PRODUCT POSITIVE-DISPLACEMENT ENGINE PLANTS; USE OF WASTE HEAT OF COMBUSTION ENGINES; NOT OTHERWISE PROVIDED FOR
- F02G1/00—Hot gas positive-displacement engine plants
- F02G1/04—Hot gas positive-displacement engine plants of closed-cycle type
- F02G1/043—Hot gas positive-displacement engine plants of closed-cycle type the engine being operated by expansion and contraction of a mass of working gas which is heated and cooled in one of a plurality of constantly communicating expansible chambers, e.g. Stirling cycle type engines
- F02G1/053—Component parts or details
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02G—HOT GAS OR COMBUSTION-PRODUCT POSITIVE-DISPLACEMENT ENGINE PLANTS; USE OF WASTE HEAT OF COMBUSTION ENGINES; NOT OTHERWISE PROVIDED FOR
- F02G1/00—Hot gas positive-displacement engine plants
- F02G1/04—Hot gas positive-displacement engine plants of closed-cycle type
- F02G1/043—Hot gas positive-displacement engine plants of closed-cycle type the engine being operated by expansion and contraction of a mass of working gas which is heated and cooled in one of a plurality of constantly communicating expansible chambers, e.g. Stirling cycle type engines
- F02G1/053—Component parts or details
- F02G1/055—Heaters or coolers
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- General Engineering & Computer Science (AREA)
- Compressors, Vaccum Pumps And Other Relevant Systems (AREA)
Abstract
The invention relates to the technical field of free piston Stirling generators, and provides a free piston Stirling power generation system with a built-in air compressing device, which comprises a heat source, a Stirling generator, an air compressing device and a helium heat transfer pipeline, wherein the helium heat transfer pipeline sequentially passes through the heat source and the Stirling generator, so that heat transfer gas in the helium heat transfer pipeline is supplied to the Stirling generator for heat transfer and power generation after being transferred with the heat source, an air compressing cavity is additionally arranged in an expansion cavity of the Stirling generator, the kinetic energy of a phase modulator in the Stirling generator is used for providing air compressing driving force, other additional driving components are not needed, the structure of the Stirling power generation system is simplified, the helium heat transfer pipeline adopts gas media, and generated high-pressure gas direct current and the heat source are directly coupled for heat exchange, and corrosion of other heat transfer media (such as molten salt, liquid metal and the like) on a thermal head structure is not needed to be considered, and the advantages of simple and compact structure, wide heat source adaptability and high thermoelectric efficiency are achieved.
Description
Technical Field
The invention relates to the technical field of free piston Stirling generators, in particular to a free piston Stirling generating system with a built-in air compressing device.
Background
The free piston Stirling generator is a novel thermoelectric conversion device with high efficiency and long service life, is formed by coupling a free piston Stirling engine and a linear oscillation motor, converts heat energy into sound energy of compressible fluid in reciprocating oscillation through a thermoacoustic effect, thereby driving a power piston to drive a magnet to reciprocally cut magnetic force lines to generate alternating current, and along with the continuous increase of space detection requirements, the free piston Stirling generator is gradually paid attention to because of the advantages of high efficiency, high reliability, long service life and the like.
In the prior art, in order to reduce heat radiation of a heat source to a heat exchanger in a free piston stirling power generation system, heat transfer is realized between a stirling power generator and the heat source by arranging two heat transfer loops, namely, a first loop is used for transferring heat with the heat source, and the heat transfer is performed on the two loops after the heat transfer is performed on the two loops and the first loop, so that in order to increase the heat transfer efficiency, a high-specific-heat fluid (such as molten salt, liquid metal and the like) is generally required to be added in the two loops as a circulating medium to absorb heat of an external heat source.
However, the two-loop heat transfer cycle increases the complexity of the system, and the circulating mediums such as molten salt, liquid metal and the like have serious corrosiveness, have serious damage to the thermal head of the generator, and reduce the working reliability and the service life of the whole generator.
Disclosure of Invention
In view of the above, the present invention provides a free piston stirling power generation system with a built-in compressor, which solves or at least partially solves the technical drawbacks of the prior art.
The invention provides a free piston Stirling power generation system with a built-in air compressing device, which comprises the following components:
a heat source;
the Stirling generator comprises a shell and a phase modulator, wherein the phase modulator is arranged in the shell and separates an expansion cavity from the inner wall of one axial side of the shell;
the air compressing device comprises an air compressing piston and an air compressing cavity, the air compressing cavity is arranged in the expansion cavity, the air compressing piston is arranged in the air compressing cavity in a relatively movable mode, the air compressing piston is connected with the phase modulator, so that the air compressing piston can do reciprocating motion along the axial direction of the air compressing cavity, helium which is the same as the inside of the Stirling generator (1) is filled in the air compressing cavity, and the air compressing cavity is provided with an outlet and an inlet;
and one end of the helium heat transfer pipeline is connected with the outlet, the other end of the helium heat transfer pipeline is connected with the inlet, and the helium heat transfer pipeline sequentially penetrates through the heat source and the Stirling generator so that heat transfer gas in the helium heat transfer pipeline and the heat source transfer heat and then are supplied to the Stirling generator for heat transfer and power generation.
According to the free piston Stirling power generation system with the built-in air compressing device, the outlet is connected with the helium gas heat transfer pipeline through the first one-way conducting piece, and the conducting direction of the first one-way conducting piece is from the outlet to one end of the helium gas heat transfer pipeline.
According to the free piston Stirling power generation system with the built-in air compressing device, the inlet is connected with the helium gas heat transfer pipeline through the second one-way conduction piece, and the conduction direction of the second one-way conduction piece is from the other end of the helium gas heat transfer pipeline to the inlet.
According to the free piston Stirling power generation system with the built-in air compressing device, the first one-way conducting piece and the second one-way conducting piece are both one-way valves.
According to the free piston Stirling power generation system with the built-in air compressing device, a gap is sealed between the air compressing piston and the air compressing cavity, so that average pressure between the expansion cavity and the air compressing cavity is kept consistent.
According to the free piston Stirling power generation system with the built-in air compressing device, the heat source is one of nuclear heat, solar heat, industrial waste heat and fuel combustion heat.
According to the free piston Stirling power generation system with the built-in air compressing device, the ratio of the volume of the air compressing cavity to the scavenging volume of the air compressing piston is 1.5-3.
According to the free piston Stirling power generation system with the built-in air compressing device provided by the invention, the Stirling power generator further comprises:
the thermoacoustic unit is arranged between the phase modulator and the radial inner wall of the shell and is used for generating acoustic power, and the phase modulator can reciprocate along the thermoacoustic unit under the action of the acoustic power;
the power piston is arranged in the shell, is arranged on one side of the phase modulator, which is far away from the expansion cavity, and is separated from the phase modulator into a compression cavity;
the linear motor is arranged between the power piston and the radial inner wall of the shell;
the elastic piece is arranged on the other side, opposite to the expansion cavity, of the shell, and the connecting rod is connected with the elastic piece.
According to the free piston Stirling power generation system with the built-in air compressing device, the elastic piece is a column spring or a plate spring.
According to the free piston Stirling power generation system with the built-in air compressing device, the thermoacoustic unit comprises a low-temperature heat exchanger, a heat regenerator and a high-temperature heat exchanger, and the low-temperature heat exchanger, the heat regenerator and the high-temperature heat exchanger are sequentially arranged from the compression cavity to the expansion cavity.
The beneficial effects are that: the free piston Stirling power generation system with the built-in air compressing device comprises a heat source, a Stirling power generator, the air compressing device and a helium heat transfer pipeline, wherein the air compressing device comprises an air compressing piston and an air compressing cavity, one end of the helium heat transfer pipeline is connected with an outlet, the other end of the helium heat transfer pipeline is connected with an inlet, the helium heat transfer pipeline sequentially passes through the heat source and the Stirling power generator, so that heat transfer gas in the helium heat transfer pipeline is transferred to the heat source and then is supplied to the Stirling power generator for heat transfer power generation, the air compressing cavity is additionally arranged in an expansion cavity of the Stirling power generator, the helium heat transfer pipeline is directly communicated with the air compressing cavity, the kinetic energy of a phase modulator in the Stirling power generator provides air compressing driving force, other additional driving components are not needed, the structure of the Stirling power generation system is simplified, the helium heat transfer pipeline adopts gas media, the generated high-pressure gas direct current and the heat source is directly coupled to the heat source, and corrosion of other heat transfer media (such as molten salt, liquid metal and the like) to the heat head structure is not needed to be considered.
Drawings
In order to more clearly illustrate the invention or the technical solutions of the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described, and it is obvious that the drawings in the description below are some embodiments of the invention, and other drawings can be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of a free piston Stirling power generation system incorporating a compressor in accordance with an embodiment of the invention;
FIG. 2 is another schematic illustration of a free piston Stirling power generation system incorporating a compressor in accordance with an embodiment of the invention;
fig. 3 is another schematic diagram of a free piston stirling power generation system incorporating a compressor in accordance with an embodiment of the present invention.
Reference numerals:
1. a Stirling generator; 11. a housing; 12. a phase modulator; 13. an expansion chamber; 14. a thermo-acoustic unit; 141. a low temperature heat exchanger; 142. a regenerator; 143. a high temperature heat exchanger; 15. a power piston; 16. a compression chamber; 17. a connecting rod; 18. a linear motor; 19. an elastic member;
2. a gas compressing device; 21. a displacer; 22. a plenum chamber; 23. an outlet; 24. an inlet;
3. a helium gas heat transfer line; 31. a first unidirectional conductive member; 32. a second unidirectional conductive member;
4. a core;
5. a combustion chamber;
6. a reflective concentrator.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings, and it is apparent that the described embodiments are some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
In the description of the present invention, it should be understood that the directions or positional relationships indicated by the terms "upper", "lower", "horizontal", "inner", "outer", etc., are based on the directions or positional relationships shown in the drawings, are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present invention.
Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present invention, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.
The present invention will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present invention more apparent.
The free piston Stirling generator is a novel thermoelectric conversion device with high efficiency and long service life, is formed by coupling a free piston Stirling engine and a linear oscillation motor, converts heat energy into sound energy of compressible fluid in reciprocating oscillation through a thermoacoustic effect, thereby driving a power piston to drive a magnet to reciprocally cut magnetic force lines to generate alternating current, and along with the continuous increase of space detection requirements, the free piston Stirling generator is gradually paid attention to because of the advantages of high efficiency, high reliability, long service life and the like.
In the prior art, in order to reduce heat radiation of a heat source to a heat exchanger in a free piston stirling power generation system, heat transfer is realized between a stirling power generator and the heat source by arranging two heat transfer loops, namely, a first loop is used for transferring heat with the heat source, and the heat transfer is performed on the two loops after the heat transfer is performed on the two loops and the first loop, so that in order to increase the heat transfer efficiency, a high-specific-heat fluid (such as molten salt, liquid metal and the like) is generally required to be added in the two loops to be used as a circulating medium to absorb heat of the heat source.
However, the two-loop heat transfer cycle increases the complexity of the system, and the circulating mediums such as molten salt, liquid metal and the like have serious corrosiveness, have serious damage to the thermal head of the generator, and reduce the working reliability and the service life of the whole generator.
In the embodiment of the invention, the compression cavity is additionally arranged in the expansion cavity of the Stirling generator, the helium heat transfer pipeline is directly communicated with the compression cavity, the kinetic energy of the phase modulator in the Stirling generator is used for providing compression driving force, other additional driving components are not needed, the structure of the Stirling power generation system is simplified, the helium heat transfer pipeline adopts gas media, the generated high-pressure gas direct current is directly coupled with a heat source for heat exchange, and corrosion of other heat transfer media (such as molten salt, liquid metal and the like) on a thermal head structure is not needed to be considered, so that the Stirling generator has the advantages of simple and compact structure, wide heat source adaptability and high thermoelectric efficiency.
As shown in fig. 1, the free piston stirling power generation system with the built-in air compressing device provided by the embodiment of the invention comprises a heat source, a stirling generator 1, an air compressing device 2 and a helium heat transfer pipeline 3, wherein the available heat source comprises any one of nuclear heat, solar heat, industrial waste heat and fuel combustion heat, and the nuclear heat is adopted as the heat source in the embodiment.
The Stirling generator 1 comprises a shell 11 and a phase modulator 12, wherein the phase modulator 12 is arranged in the shell 11 and separates an expansion cavity 13 from the inner wall of one axial side of the shell 11, the air compressing device 2 comprises an air compressing piston 21 and an air compressing cavity 22, the air compressing cavity 22 is arranged in the expansion cavity 13, the air compressing piston 21 is arranged in the air compressing cavity 22 in a relatively movable mode, the air compressing piston 21 is connected with the phase modulator 12 so that the air compressing piston 21 can reciprocate along the axial direction of the air compressing cavity 22, high-pressure helium is filled in the air compressing cavity 22, the pressure value of the high-pressure helium is 5-15 Mpa, and the air compressing cavity 22 is provided with an outlet 23 and an inlet 24. The working gas in the Stirling generator 1 is also high-pressure helium, so that the filling gas in the pressure air cavity 22 is ensured to be the same as the working gas in the Stirling generator 1.
One end of the helium gas heat transfer pipeline 3 is connected with the outlet 23, the other end is connected with the inlet 24, and the helium gas heat transfer pipeline 3 sequentially passes through the reactor core 4 and the Stirling generator 1, so that high-pressure helium gas in the helium gas heat transfer pipeline 3 transfers heat with the reactor core 4 and then is supplied to the Stirling generator 1 for heat transfer and power generation.
Specifically, when the free piston stirling power generation system with the built-in air compressing device works normally, the phase modulator 12 in the stirling power generator 1 drives the air compressing piston 21 to reciprocate in the air compressing cavity 22, sinusoidal pressure fluctuation is formed in the air compressing cavity 22, the air enters the helium heat transfer pipeline 3 through the outlet 23 of the air compressing cavity 22, so that the helium heat transfer pipeline 3 generates a stable high-pressure gas direct current, and the heat is absorbed by the reactor core 4, the high-pressure gas transfers the heat to the stirling power generator 1 through the helium heat transfer pipeline 3 to conduct heat transfer power generation, the high-pressure gas after heat transfer returns to the air compressing cavity 22 through the helium heat transfer pipeline 3 and the inlet 24, a loop for heat transfer is finally completed, and non-resonance self-circulation heat transfer is completed among the air compressing cavity 22, the helium heat transfer pipeline 3 and a heat source along with the reciprocating motion of the air compressing piston 21 in the air compressing cavity 22, and no need of other extra driving components.
In this embodiment, by adding the air compressing cavity 22 in the expansion cavity 13 of the Stirling generator 1, the helium heat transfer pipeline 3 is directly communicated with the air compressing cavity 22, and the kinetic energy of the phase modulator 12 in the Stirling generator 1 provides the compressed air driving force, so that the structure of the Stirling generating system is simplified without depending on other additional driving components, and the helium heat transfer pipeline 3 adopts a gaseous medium, and the generated high-pressure gas direct current is directly coupled with a heat source for heat exchange, so that corrosion of other heat transfer mediums (such as molten salt, liquid metal and the like) to the thermal head structure is not required to be considered, and the Stirling generator has the advantages of simple and compact structure, wide heat source adaptability and high thermoelectric efficiency.
In some embodiments of the present invention, the outlet 23 is connected to the helium gas heat transfer line 3 through a first unidirectional conducting member 31, and the conducting direction of the first unidirectional conducting member 31 is from the outlet 23 to one end of the helium gas heat transfer line 3. The first unidirectional flow guide 31 is a member that allows the gas medium in the pressure chamber 22 to flow only from the outlet 23 in the direction of one end of the helium gas heat transfer line 3, and prevents the flow in the opposite direction, and may be a check valve or a check valve, but is not limited in this embodiment. The first unidirectional conducting piece 31 is arranged between the outlet 23 and the helium gas heat transfer pipeline 3 to block pressure fluctuation in the pressure cavity 22 and prevent gas in the helium gas heat transfer pipeline 3 from entering the helium gas heat transfer pipeline 3, so that acoustic power loss in the helium gas heat transfer pipeline 3 is greatly reduced, the ineffective volume of the generator is not increased due to the introduction of the helium gas heat transfer pipeline 3, the power generation performance is not affected, and the working efficiency of the Stirling power generation system is further improved.
In other embodiments of the present invention, the inlet 24 is connected to the helium gas heat transfer line 3 through a second unidirectional conducting member 32, and the conducting direction of the second unidirectional conducting member 32 is from the other end of the helium gas heat transfer line 3 to the inlet 24. The second unidirectional flow guide 32 is a member that allows only the gas medium in the helium gas heat transfer line 3 to flow from the other end of the helium gas heat transfer line 3 in the direction of the inlet 24 and prevents the flow in the opposite direction, and may be a check valve or a unidirectional valve, and is not limited in this embodiment. The second unidirectional conducting element 32 is arranged between the inlet 24 and the helium gas heat transfer pipeline 3, so that the pressure fluctuation in the pressure air cavity 22 is blocked to prevent the pressure fluctuation from entering the high-pressure helium gas heat transfer pipeline 3, the sound power loss in the helium gas heat transfer pipeline 3 is greatly reduced, the ineffective volume of the generator is not increased due to the introduction of the helium gas heat transfer pipeline 3, the power generation performance is not affected, and the working efficiency of the Stirling power generation system is further improved.
In some embodiments of the present invention, both the first unidirectional conductive member 31 and the second unidirectional conductive member are preferably unidirectional valves.
To reduce the diameter of the check valve for easier processing, the first unidirectional conducting member 31 may be provided with a plurality of small-diameter check valves in parallel, i.e. the outlets 23 of the air compressing cavity 22 are also provided in plurality, and a check valve is provided between each outlet 23 and the helium gas heat transfer pipeline 3, and in this embodiment, two check valves are preferably provided to simplify the system.
Likewise, the second unidirectional conducting member 32 may be provided as a plurality of small-bore unidirectional valves in parallel, i.e. the inlet 24 of the plenum 22 is also provided as a plurality, and a unidirectional valve is provided between each inlet 24 and the helium gas heat transfer line 3, preferably two unidirectional valves in this embodiment to simplify the system.
In some embodiments of the present invention, a clearance seal is provided between the displacer 21 and the displacer chamber 22 to maintain a uniform average pressure between the expander chamber 13 and the displacer chamber 22. The working gas of the Stirling generator 1 circulates, so that the problem that corrosive heat transfer media such as molten salt and liquid metal damage the thermal head structure is solved, and parts such as an external driving pump are not needed, so that the complexity and the running cost of the system are greatly reduced.
In some embodiments of the present invention, the gas filled in the gas compressing cavity 22 is preferably helium, the working gas of the stirling generator 1 is usually high-pressure helium, in this embodiment, the high-pressure helium of the stirling generator 1 circulates, the kinetic energy of the phase modulator 12 provides the compressed gas driving force, no additional driving components are needed, the structure of the stirling power generation system is simplified, the helium heat transfer pipeline 3 adopts helium as the heat transfer medium, the generated high-pressure helium directly couples and exchanges heat with the heat source, corrosion of other heat transfer mediums (such as molten salt, liquid metal, etc.) on the heat head structure is not needed to be considered, namely, the working medium in the internal circulation of the stirling generator 1 is helium, the working medium in the heat transfer circuit of the external helium heat transfer pipeline 3 is also helium, and in addition, the heat transfer circuit has no acoustic power loss caused by significant pressure fluctuation due to unidirectional conductivity of the check valve, and the whole machine has the advantages of simple and compact structure, wide heat source adaptability and high thermoelectric efficiency.
As shown in fig. 2, the heat source in the stirling power generation system in this embodiment is the biomass energy generated in the combustion chamber 5, and other structures and the working principle of the stirling power generation system are the same as those of the foregoing embodiments, and will not be described herein. The helium direct current in the helium heat transfer pipeline 3 is directly coupled with the combustion biomass energy generated in the combustion chamber 5 for heat transfer, so that a larger combustion-flow coupling heat transfer area can be obtained, the heat transfer efficiency is higher, and the working efficiency of the Stirling power generation system is further improved.
As shown in fig. 3, the heat source in the stirling power generation system in this embodiment is solar energy collected in the reflective concentrator 6, and other structures and the working principle of the stirling power generation system are the same as those of the foregoing embodiments, and will not be described herein. The helium direct current in the helium heat transfer pipeline 3 is directly coupled with solar energy in the reflection condenser 6 for heat transfer, so that a large enough solar energy heat transfer area can be obtained, the structure is simple and compact, the heat transfer efficiency is high, and the performance of the Stirling power generation system is further improved.
As shown in fig. 1, in some embodiments of the present invention, the ratio of the volume of the air compressing cavity 22 to the scavenge volume of the air compressing piston 21 is 1.5-3 times, wherein the scavenge volume of the air compressing piston 21 is the volume swept by the air compressing piston 21 from one dead point to the other dead point, and in this embodiment, the scavenge volume of the air compressing piston 21 is the product of the cross-sectional area of the air compressing piston 21 and the oscillation speed amplitude of the air compressing piston 21, so that the volume of the air compressing cavity 22 is larger than the scavenge volume of the air compressing piston 21, on one hand, the air compressing piston 21 can be prevented from colliding with the inner wall of the farthest end of the air compressing cavity 22, on the other hand, the pressure of the air in the air compressing cavity 22 can be ensured, and the non-resonant self-circulation heat transfer of the air is completed among the air compressing cavity 22, the helium heat transfer pipeline 3 and the heat source without depending on other extra driving components. In some embodiments of the invention, the Stirling generator 1 further comprises a thermo-acoustic unit 14, a power piston 15, a linear motor 18 and an elastic member 19, wherein the thermo-acoustic unit 14 is arranged between the phase modulator 12 and the radially inner wall of the housing 11, the thermo-acoustic unit 14 is used for generating acoustic power, and the phase modulator 12 is capable of reciprocating along the thermo-acoustic unit 14 under the action of the acoustic power.
The power piston 15 is arranged in the shell 11, the power piston 15 is arranged on one side of the phase modulator 12 away from the expansion cavity 13, a compression cavity 16 is separated between the power piston 15 and the phase modulator 12, the power piston 15 is connected with the phase modulator 12 through a connecting rod 17, the linear motor 18 is arranged between the power piston 15 and the radial inner wall of the shell 11, the elastic piece 19 is arranged on the other side of the shell 11 opposite to the expansion cavity 13, and the connecting rod 17 is connected with the elastic piece 19.
Further, the thermo-acoustic unit 14 includes a low temperature heat exchanger 141, a heat regenerator 142, and a high temperature heat exchanger 143, and the low temperature heat exchanger 141, the heat regenerator 142, and the high temperature heat exchanger 143 are sequentially disposed from the compression chamber 16 toward the expansion chamber 13.
The working principle of the Stirling power generation system is as follows: the working medium filled in the Stirling generator 1 is helium, and the working medium in the compressed air cavity 22 is also helium. When the system works normally, the phase modulator 12 drives the air compressing piston 21 to reciprocate, sinusoidal pressure fluctuation is formed in the air compressing cavity 22, then, the unidirectional conductivity of the unidirectional valve between the outlet 23 of the air compressing cavity 22 and the helium heat transfer pipeline 3 is utilized, so that a stable high-pressure helium direct current is generated in the helium heat transfer pipeline 3, heat is absorbed by a heat source, the heat of the high-pressure helium after heat transfer is exchanged with a medium in the high-temperature heat exchanger 143 in the Stirling generator 1 through the helium heat transfer pipeline 3, a higher temperature difference is formed between the high-temperature heat exchanger 143 and the low-temperature heat exchanger 141, the heat regenerator 142 converts heat energy into sound energy of compressible fluid in reciprocating oscillation, the phase modulator 12 is driven to reciprocate, the power piston 15 is driven by the phase modulator 12 to reciprocate through the connecting rod 17, the power piston 15 cuts magnetic force lines in the linear motor 18 to generate alternating current, the elastic piece 19 provides power for reciprocation of the power piston 15, and the elastic piece 19 can be a column spring or a plate spring, which is preferable in the embodiment.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and are not limiting; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention.
Claims (10)
1. A free piston stirling power generation system incorporating a compressor, comprising:
a heat source;
the Stirling generator (1) comprises a shell (11) and a phase modulator (12), wherein the phase modulator (12) is arranged in the shell (11) and is separated from the inner wall of one axial side of the shell (11) into an expansion cavity (13);
the air compressing device (2) comprises an air compressing piston (21) and an air compressing cavity (22), wherein the air compressing cavity (22) is arranged in the expansion cavity (13), the air compressing piston (21) is arranged in the air compressing cavity (22) in a relatively movable mode, the air compressing piston (21) is connected with the phase modulator (12) so that the air compressing piston (21) can reciprocate along the axial direction of the air compressing cavity (22), helium which is the same as that in the Stirling generator (1) is filled in the air compressing cavity (22), and the air compressing cavity (22) is provided with an outlet (23) and an inlet (24);
and one end of the helium gas heat transfer pipeline (3) is connected with the outlet (23), the other end of the helium gas heat transfer pipeline (3) is connected with the inlet (24), and the helium gas heat transfer pipeline (3) sequentially penetrates through the heat source and the Stirling generator (1) so that helium gas in the helium gas heat transfer pipeline (3) and the heat source transfer heat and then are supplied to the Stirling generator (1) for heat transfer and power generation.
2. The free piston stirling power generation system with a built-in compressor of claim 1, wherein the outlet (23) is connected to the helium gas heat transfer line (3) through a first unidirectional flux (31), and the direction of flux of the first unidirectional flux (31) is from the outlet (23) to one end of the helium gas heat transfer line (3).
3. The free piston stirling power generation system with a built-in compressor of claim 2, wherein the inlet (24) is connected to the helium gas heat transfer line (3) through a second unidirectional flux (32), and the second unidirectional flux (32) is conducted from the other end of the helium gas heat transfer line (3) to the inlet (24).
4. A free piston stirling power generation system with a built-in compressor in accordance with claim 3 wherein the first and second one-way conductance elements (31) are each one-way valves.
5. The free piston stirling power generation system with built-in displacer of any one of claims 1-4 wherein a gap seal is provided between displacer (21) and displacer chamber (22) to maintain a uniform average pressure between expansion chamber (13) and displacer chamber (22).
6. The free piston stirling power generation system with a built-in gas compressor of any one of claims 1 to 4 wherein the heat source is one of nuclear heat, solar heat, waste industrial heat and fuel combustion heat.
7. The free piston stirling power generation system with built-in displacer of any one of claims 1-4 wherein the ratio of the volume of the displacer chamber (22) to the scavenge volume of the displacer (21) is 1.5-3.
8. The free piston stirling power generation system with built-in gas compression device of any one of claims 1-4, wherein the stirling generator (1) further comprises:
the thermoacoustic unit (14), the said thermoacoustic unit (14) locates between said phase modulator (12) and said radial inner wall of the said body (11), the said thermoacoustic unit (14) is used for producing the acoustic work, the said phase modulator (12) can reciprocate along the said thermoacoustic unit (14) under the said acoustic work;
the power piston (15) is arranged in the shell (11), the power piston (15) is arranged on one side of the phase modulator (12) far away from the expansion cavity (13), a compression cavity (16) is separated between the power piston (15) and the phase modulator (12), and the power piston (15) is connected with the phase modulator (12) through a connecting rod (17);
the linear motor (18) is arranged between the power piston (15) and the radial inner wall of the shell (11);
and the elastic piece (19) is arranged on the other side, opposite to the expansion cavity (13), of the shell (11), and the connecting rod (17) is connected with the elastic piece (19).
9. The free piston stirling power generation system of an internal compressor of claim 8 wherein the resilient member is a post spring or leaf spring.
10. The free piston stirling power generation system with a built-in compressor of claim 8, wherein the thermo-acoustic unit (14) includes a low temperature heat exchanger (141), a regenerator (142) and a high temperature heat exchanger (143), the low temperature heat exchanger (141), the regenerator (142) and the high temperature heat exchanger (143) being sequentially disposed from the compression chamber (16) toward the expansion chamber (13).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310613247.XA CN116398318A (en) | 2023-05-29 | 2023-05-29 | Free piston Stirling power generation system with built-in air compressing device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310613247.XA CN116398318A (en) | 2023-05-29 | 2023-05-29 | Free piston Stirling power generation system with built-in air compressing device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN116398318A true CN116398318A (en) | 2023-07-07 |
Family
ID=87016359
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202310613247.XA Pending CN116398318A (en) | 2023-05-29 | 2023-05-29 | Free piston Stirling power generation system with built-in air compressing device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN116398318A (en) |
-
2023
- 2023-05-29 CN CN202310613247.XA patent/CN116398318A/en active Pending
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