CN112228296A - Integrated power generation system based on free piston Stirling generator - Google Patents

Integrated power generation system based on free piston Stirling generator Download PDF

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Publication number
CN112228296A
CN112228296A CN202011067157.8A CN202011067157A CN112228296A CN 112228296 A CN112228296 A CN 112228296A CN 202011067157 A CN202011067157 A CN 202011067157A CN 112228296 A CN112228296 A CN 112228296A
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storage device
way valve
inlet
solar
heat
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CN202011067157.8A
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Chinese (zh)
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董宇航
潘剑锋
程凌峰
李飞扬
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Jiangsu University
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Jiangsu University
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
    • F03G—SPRING, WEIGHT, INERTIA OR LIKE MOTORS; MECHANICAL-POWER PRODUCING DEVICES OR MECHANISMS, NOT OTHERWISE PROVIDED FOR OR USING ENERGY SOURCES NOT OTHERWISE PROVIDED FOR
    • F03G6/00—Devices for producing mechanical power from solar energy
    • F03G6/06—Devices for producing mechanical power from solar energy with solar energy concentrating means
    • F03G6/068—Devices for producing mechanical power from solar energy with solar energy concentrating means having other power cycles, e.g. Stirling or transcritical, supercritical cycles; combined with other power sources, e.g. wind, gas or nuclear
    • 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
    • F02G1/0435—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 the engine being of the free piston type
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24S—SOLAR HEAT COLLECTORS; SOLAR HEAT SYSTEMS
    • F24S10/00—Solar heat collectors using working fluids
    • F24S10/40—Solar heat collectors using working fluids in absorbing elements surrounded by transparent enclosures, e.g. evacuated solar collectors
    • F24S10/45—Solar heat collectors using working fluids in absorbing elements surrounded by transparent enclosures, e.g. evacuated solar collectors the enclosure being cylindrical
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24S—SOLAR HEAT COLLECTORS; SOLAR HEAT SYSTEMS
    • F24S10/00—Solar heat collectors using working fluids
    • F24S10/70—Solar heat collectors using working fluids the working fluids being conveyed through tubular absorbing conduits
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24S—SOLAR HEAT COLLECTORS; SOLAR HEAT SYSTEMS
    • F24S20/00—Solar heat collectors specially adapted for particular uses or environments
    • F24S20/20—Solar heat collectors for receiving concentrated solar energy, e.g. receivers for solar power plants
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24S—SOLAR HEAT COLLECTORS; SOLAR HEAT SYSTEMS
    • F24S50/00—Arrangements for controlling solar heat collectors
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24S—SOLAR HEAT COLLECTORS; SOLAR HEAT SYSTEMS
    • F24S60/00—Arrangements for storing heat collected by solar heat collectors
    • F24S60/10—Arrangements for storing heat collected by solar heat collectors using latent heat
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00—Energy generation through renewable energy sources
    • Y02E10/40—Solar thermal energy, e.g. solar towers
    • Y02E10/44—Heat exchange systems
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00—Energy generation through renewable energy sources
    • Y02E10/40—Solar thermal energy, e.g. solar towers
    • Y02E10/46—Conversion of thermal power into mechanical power, e.g. Rankine, Stirling or solar thermal engines

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Sustainable Energy (AREA)
  • Sustainable Development (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Thermal Sciences (AREA)
  • Physics & Mathematics (AREA)
  • Photovoltaic Devices (AREA)
  • Heat-Pump Type And Storage Water Heaters (AREA)
  • Engine Equipment That Uses Special Cycles (AREA)

Abstract

The invention provides an integrated power generation system based on a free piston Stirling generator, which comprises a solar heat collector, a phase-change heat storage device, a Stirling generator, a nanofluid pipeline, a liquid storage device, a working medium pump, a hot water heat exchange pipeline and a vacuum heat collection pipe; a vacuum heat collecting pipe is arranged in the solar heat collector; the outlet of the vacuum heat collecting pipe is connected with the inlet of the phase-change heat storage device through a three-way valve, the other end of the nano fluid pipeline is connected with the inlet of the Stirling generator through the three-way valve, and the other end of the three-way valve is connected with the outlet of the phase-change heat storage device; the outlet of the Stirling generator is sequentially connected with a liquid storage device, a working medium pump, a hot water heat exchange pipeline, a three-way valve and an inlet of a vacuum heat collecting pipe; the other end of the three-way valve is connected with an inlet of the phase-change heat storage device. The invention has the capabilities of high-efficiency thermoelectric conversion, low-noise operation and long-time high-reliability work.

Description

Integrated power generation system based on free piston Stirling generator
Technical Field
The invention relates to the field of power generation, in particular to an integrated power generation system based on a free piston Stirling generator.
Background
Energy is a material basis of human survival and economic development, and along with the continuous and high-speed development of world economy, the problems of energy shortage, environmental pollution, ecological deterioration and the like are gradually deepened, and the contradiction between energy supply and demand is increasingly prominent. Among them, the most common and prominent energy problems are energy shortage and environmental pollution. The application field of solar energy as inexhaustible clean energy is gradually expanding, and solar photovoltaic power generation and solar photo-thermal power generation are the mainstream development direction of solar energy application. The solar photo-thermal power generation utilizes a high-precision condenser to converge low-density solar energy into high-density heat energy, and drives a generator by heating a working medium to realize photoelectric conversion.
A large number of herdsmen are in western regions of wide country, and if a centralized power supply mode is adopted, the following problems can be caused:
1) infrastructure consumption is high: the grassland is sparse, a large number of power stations need to be built by using centralized power supply, long power transmission lines are laid, and huge time and money cost is consumed;
2) the line loss is great: longer power transmission line laying leads to electric energy loss in the electric quantity transmission process, the power supply range is larger, and the voltage quality is reduced;
3) the electricity utilization safety is as follows: the grassland environment is severe, the service life of the equipment is greatly shortened, and danger can be generated in normal use.
Because the power grid on the grassland is difficult to completely cover, many herdsmen use self-contained diesel generators for electricity consumption, but the diesel generators have the defects of low generating efficiency and serious environmental pollution, especially in fragile ecosystems such as the grassland and the like. The requirements of environmental friendliness and low carbon are difficult to achieve.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides an integrated power generation system based on a free piston Stirling generator, wherein a solar heat collector has a light following function, can automatically track the position of the sun to rotate by 360 degrees, obtains the best photo-thermal conversion efficiency without human intervention, a phase change heat storage device positioned in the middle can store redundant solar energy when the illumination is sufficient and timely supplement heat for a fluid working medium when the illumination intensity is insufficient, the free piston Stirling generator positioned at the bottom receives heat brought by nano fluid to operate, and utilizes natural air cooling to dissipate heat, and a heat supplementing interface and a hot water heating interface are additionally arranged.
The present invention achieves the above-described object by the following technical means.
An integrated power generation system based on a free piston Stirling generator comprises a solar heat collector, a phase change heat storage device, a Stirling generator, a nanofluid pipeline, a liquid storage device, a working medium pump, a hot water heat exchange pipeline and a vacuum heat collection pipe;
the solar heat collector is internally provided with a vacuum heat collecting pipe and is used for heating nanofluid filled in the vacuum heat collecting pipe by using solar energy; the outlet of the vacuum heat collecting pipe is connected with the inlet of the phase change heat storage device through a first three-way valve, the other end of the first three-way valve is connected with one end of a nano fluid pipeline, the other end of the nano fluid pipeline is connected with the inlet of the Stirling generator through a second three-way valve, and the other end of the second three-way valve is connected with the outlet of the phase change heat storage device; the outlet of the Stirling generator is sequentially connected with a liquid storage device, a working medium pump, a hot water heat exchange pipeline, a third three-way valve and an inlet of the vacuum heat collection pipe; the other end of the third three-way valve is connected with an inlet of the phase change heat storage device.
The controller controls the first three-way valve to enable the outlet of the evacuated collector tube to be communicated with the inlet of the phase change heat storage device or the outlet of the evacuated collector tube to be communicated with the nanofluid pipeline; the controller controls the second three-way valve to enable the outlet of the phase change heat storage device to be communicated with the inlet of the Stirling generator or the nano fluid pipeline to be communicated with the inlet of the Stirling generator; and the controller controls the third three-way valve to be used for communicating the hot water heat exchange pipeline with the inlet of the vacuum heat collecting pipe or communicating the hot water heat exchange pipeline with the inlet of the phase change heat storage device.
Further, the nano fluid is Al2O3A nanofluid.
The solar heat collector is characterized by further comprising a photosensitive device and a rotating device, wherein the rotating device is installed at the bottom of the solar heat collector, and the photosensitive device is located at the upper part of the solar heat collector and used for sensing illumination intensity; the controller controls the rotation angle of the rotating device according to the photosensitive device.
Furthermore, the solar heat collector comprises a solar auxiliary heat collector and a solar main heat collector, the two sides of the solar main heat collector are connected with the solar auxiliary heat collector through retractable auxiliary heat collector supporting devices, and the controller controls the retractable auxiliary heat collector supporting devices to enable the solar auxiliary heat collector to be unfolded or folded.
Further, the device also comprises a sleeve heat supplementing device, and the sleeve heat supplementing device supplements and heats the nanometer fluid in the nanometer fluid pipeline through external heat energy.
The invention has the beneficial effects that:
1. compared with the common nano fluid heat transfer working medium, the integrated power generation system based on the free piston Stirling generator adopts the Al to adapt to the day and night temperature difference of western regions and the integrated portable characteristic of the device2O3The nano fluid has good freezing resistance, shows the characteristic of strong absorption of solar spectrum in a certain particle mass fraction range, and strengthens the photo-thermal conversion. Meanwhile, the heat conductivity coefficient of liquid is obviously increased, the convection heat transfer of fluid is enhanced, the mass of working media used in the device is reduced, and the cost and the weight of the device are further reduced.
2. The integrated power generation system based on the free piston Stirling generator controls the solar heat collector to realize a light following function, controls the rotation of the solar heat collector 360 and the adjustment of the inclination angle, enables the solar heat collector to be automatically adjusted to reach the highest point of light-heat conversion rate without human intervention in one day, enables the solar heat collector to have higher light-heat conversion rate, and enables the auxiliary heat collectors capable of being lifted at two sides to provide more solar radiant heat for the set of device.
3. The integrated power generation system based on the free piston Stirling generator adopts the cordierite-based ceramic-alloy PCM composite heat storage material as the phase change heat storage device, has good stability, no toxicity, no corrosion, no flammability and no explosion, has large heat conductivity, can store and release energy at any time, and has small material volume effect generated by heat change; the material cost is low. The energy storage density is large, and the size of the whole device is reduced.
4. According to the integrated power generation system based on the free piston Stirling generator, the integrated arrangement of the device can reduce the whole floor area, and a plurality of power generation units can be connected in series for use according to requirements. When herdsmen need to move, the main components of the herdsmen can integrally move as a whole without being disassembled.
5. The integrated power generation system based on the free piston Stirling generator reduces the use of fossil fuel and pollution, has high reliability, has long service life of each part, and reduces the cost of periodic maintenance.
6. The integrated power generation system based on the free piston Stirling generator can also be externally connected with a sleeve heat supplementing device for biomass combustion and is used for supplementing and heating the nanofluid in the nanofluid pipeline under the conditions of insufficient illumination intensity or emergency.
7. The integrated power generation system based on the free piston Stirling generator provides heat exchange for a hot water pipeline, can be externally connected with a water tank, and guarantees the hot water use requirement of herdsmen.
Drawings
Fig. 1 is a diagram of an integrated power generation system based on a free piston stirling generator according to the present invention.
In the figure:
1-solar secondary heat collector; 2-a solar primary collector; 3-a first three-way valve; 4-nanofluidic lines; 5-a phase change thermal storage device; 6-sleeve heat supplementing device; 7-a second three-way valve; 8-a stirling generator; 9-a rotating device; 10-a liquid storage device; 11-a working medium pump; 12-a controller; 13-hot water heat exchange pipes; 14-a retractable secondary collector support; 15-a third three-way valve; 16-a photosensitive device; 17-a flexible hose; 18-vacuum heat collecting pipes; a-an inlet of a heating section; b-heating section outlet; c-inlet of heat storage device; d-a thermal storage device outlet; e-hot end inlet; f-hot end outlet; g-a heat-supplementing inlet; h-heat supplement outlet; i-water tank inlet; j-outlet of water tank.
Detailed Description
The invention will be further described with reference to the following figures and specific examples, but the scope of the invention is not limited thereto.
As shown in fig. 1, the integrated power generation system based on the free-piston stirling generator comprises a solar thermal collector, a controller 12, a photosensitive device 16, a rotating device 9, a phase-change thermal storage device 5, a stirling generator 8, a nanofluid pipeline 4, a liquid storage device 10, a working medium pump 11, a hot water heat exchange pipeline 13 and a vacuum heat collection pipe 18;
the solar heat collector is internally provided with a vacuum heat collecting tube 18 and is used for heating nanofluid filled in the vacuum heat collecting tube 18 by using solar energy; the nano fluid is Al2O3A nanofluid. An outlet of the vacuum heat collecting tube 18 is connected with an inlet of a phase change heat storage device 5 through a first three-way valve 3, the other end of the first three-way valve 3 is connected with one end of a nano fluid pipeline 4, the other end of the nano fluid pipeline 4 is connected with an inlet of a Stirling generator 8 through a second three-way valve 7, and the other end of the second three-way valve 7 is connected with an outlet of the phase change heat storage device 5; the outlet of the Stirling generator 8 is sequentially connected with a liquid storage device 10, a working medium pump 11, a hot water heat exchange pipeline 13, a third three-way valve 15 and an inlet of a vacuum heat collection pipe 18; the other end of the third three-way valve 15 is connected with an inlet of the phase change heat storage device 5. The bottom of the solar heat collector is provided with a rotating device 9, and the photosensitive device 16 is positioned at the upper part of the solar heat collector and used for sensing the illumination intensity; the controller 12 controls the rotation angle of the rotating device 9 according to the photosensitive device 16. The solar heat collector comprises a solar auxiliary heat collector 1 and a solar main heat collector 2, wherein two sides of the solar main heat collector 2 are provided with retractable auxiliary heat collectorsThe controller 12 controls the retractable auxiliary heat collector supporting device 14 to expand or retract the solar auxiliary heat collector 1, wherein the controller 14 is connected with the solar auxiliary heat collector 1.
The controller 12 controls the first three-way valve 3 to enable the outlet of the evacuated collector tube 18 to be communicated with the inlet of the phase change heat storage device 5 or the outlet of the evacuated collector tube 18 to be communicated with the nanofluid pipeline 4; the controller 12 controls the second three-way valve 7 to enable the outlet of the phase change heat storage device 5 to be communicated with the inlet of the Stirling generator 8 or the nano fluid pipeline 4 to be communicated with the inlet of the Stirling generator 8; the controller 12 controls the third three-way valve 15 to communicate the hot water heat exchange pipeline 13 with the inlet of the vacuum heat collecting tube 18 or communicate the hot water heat exchange pipeline 13 with the inlet of the phase change heat storage device 5.
The free piston Stirling power generation 8 adopts a full-sealing structure, so that the sealing difficulty caused by high pressure difference of a moving Stirling power generation system is avoided; the system only has two moving parts without a driving mechanism, and has simple structure and low cost; only reciprocating linear motion exists, and no piston lateral force exists, so that clearance sealing can be adopted without lubrication, and the reliability and the service life of the system are improved; the inertia force generated by the reciprocating linear motion is easy to balance, so that the system vibration and noise can be further reduced.
Working process
Early morning, the system starts to work, firstly, the solar energy auxiliary heat collectors 1 originally positioned at two sides of the system are lifted, namely the original vertical state is changed into the horizontal state, and special attention needs to be paid to the fact that the connecting pipeline 17 between the solar energy auxiliary heat collectors 1 and the solar energy main heat collector 2 is made of flexible materials, the whole pipeline structure can be guaranteed not to be affected and has certain flexibility in the folded and laid state, the pipeline connecting state is not damaged, the illumination intensity is weak, the solar energy heat collectors absorb solar energy to heat the vacuum heat collecting pipes 18, the nano fluid in the vacuum heat collecting pipes 18 is heated, the nano fluid directly exchanges heat with the hot end of the free piston Stirling generator 8 through the nano fluid pipeline 4, the hot end temperature is not very high at the moment, but the cold end temperature is low due to environmental reasons, the heat efficiency is not too low, and the nano fluid after heat exchange is finished enters the liquid storage device 10 to, the flow path of the nanofluid at this stage is: the heating section inlet A → the heating section outlet B → the first three-way valve 3 → the nanofluid pipeline 4 → the second three-way valve 7 → the hot end inlet E → the hot end outlet F → the liquid storage device 10 → the working medium pump 11 → the third three-way valve 15 → the heating section inlet A;
at noon, the sunlight is strong at this time, the heat of the nanofluid cannot be completely absorbed by the hot end of the generator 8, so that the pipeline of the nanofluid is connected to the heat storage device 5 through the first three-way valve 3, a part of heat is stored in the heat storage device 5, the waste of the heat is reduced, and the nanofluid passing through the heat storage device 5 flows out through the second three-way valve 7 and then exchanges heat with the hot end of the generator 8; the nanofluid after heat exchange enters the liquid storage device 10 to perform the next round of heat absorption under the action of the working medium pump 11, and the flow path of the nanofluid at the stage is as follows: the heating section inlet A → the heating section outlet B → the first three-way valve 3 → the heat storage device inlet C → the heat storage device outlet D → the second three-way valve 7 → the hot end inlet E → the hot end outlet F → the liquid storage device 10 → the working medium pump 11 → the third three-way valve 15 → the heating section inlet A;
in the afternoon, the light is normal, the working state is similar to the morning, and the flow path of the nano fluid at the stage is as follows: the heating section inlet A → the heating section outlet B → the first three-way valve 3 → the nanofluid pipeline 4 → the second three-way valve 7 → the hot end inlet E → the hot end outlet F → the liquid storage device 10 → the working medium pump 11 → the third three-way valve 15 → the heating section inlet A;
in the evening, the solar energy is reduced, the operating state is similar to the midday operating state, but at this time, heat is not stored into the thermal storage device 5 but is extracted from the thermal storage device 5 for power generation, and the flow path of the nanofluid is: the heating section inlet A → the heating section outlet B → the first three-way valve 3 → the heat storage device inlet C → the heat storage device outlet D → the second three-way valve 7 → the hot end inlet E → the hot end outlet F → the liquid storage device 10 → the working medium pump 11 → the third three-way valve 15 → the heating section inlet A;
after the sun fell, the vice heat collector 1 was regained in the work of collapsible vice heat collector strutting arrangement 14, and the nanofluid at this moment does not pass through solar collector, and first three-way valve A made the nanofluid through heat storage device 5 this moment, absorbed the heat from heat storage device 5 and passed through second three-way valve 7 again with the heat transfer of 8 hot ends of generator, and the heat transfer finishes getting into stock solution device 11, gets into heat storage device 5 through three-way valve C through working medium pump 11 and absorbs the heat, and the fluidic flow path of this stage nanofluid is: the heat storage device inlet C → the heat storage device outlet D → the second three-way valve 7 → the hot end inlet E → the hot end outlet F → the liquid storage device 10 → the working medium pump 11 → the third three-way valve 15 → the heat storage device inlet C;
when the heat storage device provides insufficient heat to supply to the generator to overcome the resistance power generation mode, the equipment stops working, and the working medium stops flowing. And the cold end of the generator is cooled by air cooling.
The energy of the retractable auxiliary heat collector supporting device 14, the controller 12, the rotating device 9 and the working medium pump 11 in the system is supplied by the system. The working medium pump 11 is used for driving the nanometer fluid working medium to circulate in the pipeline. The reservoir 10 is used for adjusting the change of the volume flow and the like caused by the expansion or the change of the working conditions of the nano fluid in the pipeline at that time, so that the whole system is safer and more stable, the controller automatically selects the optimal operation strategy according to the current operation state, and the cooperation among the valves is controlled, so that the device achieves the highest working efficiency.
In addition, for the system, in a pipeline parallel to the heat storage device, a sleeve heat supplementing device 6 is arranged, an external interface can be provided for connecting a afterburning device, such as a small biomass boiler and the like, and the sleeve heat supplementing device 6 supplements and heats the nanometer fluid in the nanometer fluid pipeline 4 through external heat energy.
The heat storage device has good heat storage and large heat flux density, although the system can not be driven continuously to generate electricity at night and other conditions, the stored heat is considerable, and the heat storage device can be continuously used the next day, so that the heat absorbed by the heat storage device the next day is more used for generating electricity instead of being heated to the threshold temperature for generating electricity, and the system can rapidly enter a normal working state.
The hot water heat exchange pipeline 13 is arranged, the inside of the hot water heat exchange pipeline is nanofluid after acting, the outside of the hot water heat exchange pipeline is a heat exchange water pipe connected to herdsmen, and the hotter nanofluid and water heat exchange is utilized for producing hot water for the herdsmen to use.
The present invention is not limited to the above-described embodiments, and any obvious improvements, substitutions or modifications can be made by those skilled in the art without departing from the spirit of the present invention.

Claims (6)

1. An integrated power generation system based on a free piston Stirling generator is characterized by comprising a solar heat collector, a phase change heat storage device (5), a Stirling generator (8), a nano fluid pipeline (4), a liquid storage device (10), a working medium pump (11), a hot water heat exchange pipeline (13) and a vacuum heat collection pipe (18);
the solar heat collector is internally provided with a vacuum heat collecting pipe (18) and is used for heating the nanofluid filled in the vacuum heat collecting pipe (18) by utilizing solar energy; an outlet of the vacuum heat collecting pipe (18) is connected with an inlet of the phase change heat storage device (5) through a first three-way valve (3), the other end of the first three-way valve (3) is connected with one end of a nano fluid pipeline (4), the other end of the nano fluid pipeline (4) is connected with an inlet of a Stirling generator (8) through a second three-way valve (7), and the other end of the second three-way valve (7) is connected with an outlet of the phase change heat storage device (5); the outlet of the Stirling generator (8) is sequentially connected with a liquid storage device (10), a working medium pump (11), a hot water heat exchange pipeline (13), a third three-way valve (15) and the inlet of a vacuum heat collecting pipe (18); the other end of the third three-way valve (15) is connected with an inlet of the phase change heat storage device (5).
2. The integrated power generation system based on the free-piston Stirling generator according to claim 1, further comprising a controller (12), wherein the controller (12) controls the first three-way valve (3) to enable the outlet of the evacuated collector tube (18) to be communicated with the inlet of the phase-change heat storage device (5) or the outlet of the evacuated collector tube (18) to be communicated with the nano-fluid pipeline (4); the controller (12) controls the second three-way valve (7) to enable the outlet of the phase change heat storage device (5) to be communicated with the inlet of the Stirling generator (8) or the nano fluid pipeline (4) to be communicated with the inlet of the Stirling generator (8); the controller (12) controls the third three-way valve (15) to enable the hot water heat exchange pipeline (13) to be communicated with an inlet of the vacuum heat collection pipe (18) or the hot water heat exchange pipeline (13) to be communicated with an inlet of the phase change heat storage device (5).
3. The integrated free-piston stirling generator-based power generation system of claim 1 wherein the nanofluid is Al2O3A nanofluid.
4. The integrated power generation system based on the free-piston Stirling generator according to claim 2, further comprising a photosensitive device (16) and a rotating device (9), wherein the rotating device (9) is installed at the bottom of the solar heat collector, and the photosensitive device (16) is located at the upper part of the solar heat collector and used for sensing the illumination intensity; the controller (12) controls the rotation angle of the rotating device (9) according to the photosensitive device (16).
5. The integrated free-piston stirling generator-based power generation system according to claim 2 wherein the solar collector comprises a solar secondary collector (1) and a solar primary collector (2), the two sides of the solar primary collector (2) are connected with the solar secondary collector (1) through retractable secondary collector support devices (14), and the controller (12) controls the retractable secondary collector support devices (14) to expand or retract the solar secondary collector (1).
6. The integrated free-piston stirling generator-based power generation system of claim 2 further comprising a sleeve thermal restitution device (6), the sleeve thermal restitution device (6) heating the nanofluid within the nanofluid pipeline (4) by external thermal energy restitution.
CN202011067157.8A 2020-10-05 2020-10-05 Integrated power generation system based on free piston Stirling generator Pending CN112228296A (en)

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