CN102155365B - Hot-sand-heat-accumulating solar disc type Stirling engine generating set and method thereof - Google Patents

Hot-sand-heat-accumulating solar disc type Stirling engine generating set and method thereof Download PDF

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Publication number
CN102155365B
CN102155365B CN201110127569A CN201110127569A CN102155365B CN 102155365 B CN102155365 B CN 102155365B CN 201110127569 A CN201110127569 A CN 201110127569A CN 201110127569 A CN201110127569 A CN 201110127569A CN 102155365 B CN102155365 B CN 102155365B
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hot
heat
stirling
sand
electric hybrid
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CN102155365A (en
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骆仲泱
倪明江
肖刚
岑可法
高翔
方梦祥
周劲松
施正伦
程乐鸣
王勤辉
王树荣
余春江
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Zhejiang University ZJU
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Zhejiang University ZJU
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    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00Energy generation through renewable energy sources
    • Y02E10/40Solar thermal energy, e.g. solar towers
    • Y02E10/46Conversion of thermal power into mechanical power, e.g. Rankine, Stirling or solar thermal engines

Abstract

The invention discloses a hot-sand-heat-accumulating solar disc-type Stirling engine generating set and a method thereof. A cold material cabin, a returned material elevator, a heat-preserving spiral conveyer, a flat-plate heat absorbing cavity, a hot material cabin, a Stirling engine and a star-shaped valve are connected in sequence; the flat-plate heat absorbing cavity is provided with a solar light-gathering tracking system; the solar light-gathering tracking system comprises a primary light gathering mirror, a secondary light gathering mirror, a third reflecting mirror, a back bracket, a double-axis tracking system, an upright post, a rotating base plate, a controller and a support rod; the middle of a disc-type reflecting mirror with a paraboloid of revolution is provided with a light hole; a third light-gathering mirror is arranged below the light hole; and the secondary light-gathering mirror is arranged at a position 200-4,000 millimeters away from the peak of the disc-type reflecting mirror with the paraboloid of revolution. By adopting the generating set and the method, the defects of fluctuation of the generated power and even machine halt caused by discontinuity and instability of sunlight are overcome; meanwhile, the inlet temperature of a heat exchanging cavity of the Stirling engine is more stable and the stability of a generating system is enhanced.

Description

A kind of hot sand thermal storage solar can dish formula Stirling-electric hybrid electricity generating device and method thereof
Technical field
The present invention relates to the solar energy thermal-power-generating field, relating in particular to a kind of hot sand thermal storage solar can dish formula Stirling-electric hybrid electricity generating device and method thereof.
Background technique
Global solar radiation amount about 1.7 * 10 17W, wherein China accounts for 1% (1.8 * 10 15W is equivalent to 1.9 trillion tons of mark coal/years), be present year 680 times of total energy consumption of China.Electric power is maximum secondary energy of consumption in the world, and solar energy generation technology is an effective means of effectively alleviating current energy crisis, and application prospect is extremely wide.
Solar energy generation technology mainly is divided into photovoltaic generation and solar energy thermal-power-generating two big classes.Photovoltaic generation mainly is to utilize the photoelectric effect of photovoltaic battery panel to generate electricity, and when unglazed or sunlight intensity fluctuation, complete generation outage of photovoltaic generating system or generated output fluctuation are impacted very big to electrical network.Solar energy thermal-power-generating mainly is through parabolic mirror sunlight to be gathered together, and directly utilizes external heating motor (like Stirling-electric hybrid) generating, or produces the steam driven steam turbine power generation of HTHP through heat-exchanger rig.Solar energy thermal-power-generating efficient is higher, can be stored in evening or the continuation generating of unglazed time through heat, increases the operation stability and the reliability of solar heat power generation system.
Summary of the invention
The present invention is directed to the deficiency of existing solar energy thermal-power-generating method, a kind of hot sand thermal storage solar ability dish formula Stirling-electric hybrid electricity generating device and method thereof are provided.
Hot sand thermal storage solar can comprise Salar light-gathering tracking system, hot aggregate bin, urgent bypass outlet, cold burden storehouse, returning charge lift, star-like valve, generator, Stirling engine, insulation screw conveyor, flat heat-absorbing chamber by dish formula Stirling-electric hybrid electricity generating device; Cold burden storehouse, returning charge lift, insulation screw conveyor, flat heat-absorbing chamber, hot aggregate bin, Stirling engine, star-like valve link to each other in order; Flat heat-absorbing chamber is provided with the Salar light-gathering tracking system, and the Salar light-gathering tracking system comprises condenser, secondary condensation mirror, triplex reflector, back bracket, double-axis tracking system, column, swivel base, controller, strut; Have loophole in the middle of the dish formula reflector of the paraboloid of revolution, the arranged beneath of loophole has condenser three times; The top of loophole; At cloth secondary condensation mirror from vertex distance 200~4000mm place of paraboloid of revolution dish formula reflector; Be provided with strut between paraboloid of revolution dish formula reflector and the secondary condensation mirror; The back bracket of paraboloid of revolution dish formula reflector is connected through the double-axis tracking system with column one end, and the controller of double-axis tracking system places on the ground, and the column the other end links to each other with swivel base.
Hot sand thermal storage solar can dish formula Stirling-electric hybrid electricity-generating method be: through the double-axis tracking system; Converge to the condenser below one time by controller control condenser, secondary condensation mirror and triplex reflector and with sunlight; Therefore devices such as flat heat-absorbing chamber, hot aggregate bin, Stirling-electric hybrid and generator can be arranged on the ground, have largely improved the stability and the wind resistance of system; On the hot sand of irradiate light after converging in flat heat-absorbing chamber; The hot sand temperature in flat heat-absorbing chamber outlet port reaches 800 ℃~1000 ℃, and hot sand gets into hot aggregate bin, and the hot sand temperature stabilization in the hot aggregate bin is at 700 ℃~950 ℃; The heat exchanging chamber heat exchange after heat sand temperature stabilization of process Stirling-electric hybrid is at 300 ℃~500 ℃; Stirling-electric hybrid links to each other with generator, drives generator for electricity generation, and hot sand is gone into the cold burden storehouse through star-like valve flow; Get back to flat heat-absorbing chamber through the returning charge lift with the insulation screw conveyor again and heat again, form circulation with this; At the overcast and rainy or night of sunlight deficiency; The heat exchanging chamber that 700 ℃~950 ℃ the hot sand that stores in the hot aggregate bin gets into Stirling-electric hybrid carries out heat exchange, for Stirling-electric hybrid provides thermal source, guarantees the generating that generator can be continual and steady; Heat exchange after heat sand temperature stabilization is at 300 ℃~500 ℃; Go into the cold burden storehouse through star-like valve flow, get back to flat heat-absorbing chamber through returning charge lift and insulation screw conveyor again, form circulation with this; Under special circumstances, the hot sand in the hot aggregate bin can be through urgent bypass outlet discharging, and material flows into the cold burden storehouse, improves the Safety performance of system.
Compared with prior art, the present invention has the following advantages:
1, the concentrating method of the present invention's employing can be realized behind the solar energy dish formula optically focused optically focused focal spot all being transferred to dish formula system below, can effectively reduce the energy consumption of sun tracking system, improves the balance and the wind resistance of system.Whole solar concentrating system is controlled by the double-axis tracking system simultaneously, but the real-time tracking sun guarantees spotlight effect.
2, the hot sand regenerative system that adopts of the present invention, can be in sunlight intensity during not enough or rainy weather be that Stirling-electric hybrid provides thermal source, make Stirling-electric hybrid continue generating, overcome that sunlight is discontinuous and unstable to cause generated output to fluctuate even the shortcoming of shutdown.
3, the present invention has adopted hot sand as cycle fluid, and specific heat capacity is big, and blackness is high, and circulating temperature is high, can change solar radiant energy into heat energy and storage effectively; Simultaneously, the present invention adopts Stirling-electric hybrid as being the device of mechanical energy with thermal power transfer, can improve the efficient of solar energy thermal-power-generating.
4, the present invention has adopted the Emergency Cooling System method, and under special circumstances, the hot sand in the hot aggregate bin can through after the water jacket cooling, flow into the cold burden storehouse through gate valve again through urgent bypass outlet discharging, improves the Safety performance of system.
Description of drawings:
Fig. 1 is the structural representation of hot sand thermal storage solar ability dish formula Stirling-electric hybrid electricity generating device;
Fig. 2 is the structural representation of solar-energy light collector of the present invention:
Among the figure: condenser 1, secondary condensation mirror 2, triplex reflector 3, hot aggregate bin 4, urgent bypass outlet 5, cold burden storehouse 6, returning charge lift 7, star-like valve 8, generator 9, Stirling engine 10, insulation screw conveyor 11, flat heat-absorbing chamber 12, back bracket 13, double-axis tracking system 14, column 15, swivel base 16, controller 17, strut 18.
Embodiment:
Like Fig. 1, shown in 2, hot sand thermal storage solar can comprise Salar light-gathering tracking system, hot aggregate bin 4, urgent bypass outlet 5, cold burden storehouse 6, returning charge lift 7, star-like valve 8, generator 9, Stirling engine 10, insulation screw conveyor 11, flat heat-absorbing chamber 12 by dish formula Stirling-electric hybrid electricity generating device; Cold burden storehouse 6, returning charge lift 7, insulation screw conveyor 11, flat heat-absorbing chamber 12, hot aggregate bin 4, Stirling engine 10, star-like valve 8 link to each other in order; Flat heat-absorbing chamber 12 is provided with the Salar light-gathering tracking system, and the Salar light-gathering tracking system comprises condenser 1, secondary condensation mirror 2, triplex reflector 3, back bracket 13, double-axis tracking system 14, column 15, swivel base 16, controller 17, strut 18; Have loophole in the middle of the dish formula reflector 1 of the paraboloid of revolution, the arranged beneath of loophole has condenser 3 three times; The top of loophole; At cloth secondary condensation mirror 2 from vertex distance 200~4000mm place of paraboloid of revolution dish formula reflector 1; Be provided with strut 18 between paraboloid of revolution dish formula reflector 1 and the secondary condensation mirror 2; The back bracket 13 of paraboloid of revolution dish formula reflector 1 is connected through double-axis tracking system 14 with column 15 1 ends, and the controller 17 of double-axis tracking system 14 places on the ground, and column 15 the other ends link to each other with swivel base 16.
Hot sand thermal storage solar can dish formula Stirling-electric hybrid electricity-generating method be: through double-axis tracking system 14; Converge to condenser 1 below one time by controller 17 controls condenser 1, secondary condensation mirror 2 and triplex reflector 3 and with sunlight; Devices such as therefore flat heat-absorbing chamber 12, hot aggregate bin 4, Stirling-electric hybrid 10 and generator 9 can be arranged on the ground, have largely improved the stability and the wind resistance of system; On the hot sand of irradiate light after converging in flat heat-absorbing chamber 12; The hot sand temperature in flat heat-absorbing chamber 12 outlet ports reaches 800 ℃~1000 ℃, and hot sand gets into hot aggregate bin 4, and the hot sand temperature stabilization in the hot aggregate bin 4 is at 700 ℃~950 ℃; The heat exchanging chamber heat exchange after heat sand temperature stabilization of process Stirling-electric hybrid 10 is at 300 ℃~500 ℃; Stirling-electric hybrid 10 links to each other with generator 9, drives generator 9 generatings, and hot sand flows into cold burden storehouse 6 through star-like valve 8; Get back to flat heat-absorbing chamber 12 through returning charge lift 7 with insulation screw conveyor 11 again and heat again, form circulation with this; At the overcast and rainy or night of sunlight deficiency; The heat exchanging chamber that 700 ℃~950 ℃ the hot sand that stores in the hot aggregate bin 4 gets into Stirling-electric hybrid 10 carries out heat exchange, for Stirling-electric hybrid 10 provides thermal source, guarantees the generating that generator 9 can be continual and steady; Heat exchange after heat sand temperature stabilization is at 300 ℃~500 ℃; Flow into cold burden storehouse 6 through star-like valve 8, get back to flat heat-absorbing chamber 12 through returning charge lift 7 and insulation screw conveyor 11 again, form circulation with this; Under special circumstances, the hot sand in the hot aggregate bin 4 can export 5 dischargings through urgent bypass, and material flows into cold burden storehouse 8, improves the Safety performance of system.
Embodiment:
The hot sand thermal storage solar ability dish formula Stirling-electric hybrid electricity generating device of present embodiment is as shown in Figure 1; Device is made up of condenser, secondary condensation mirror, triplex reflector, hot aggregate bin, urgent bypass outlet, cold burden storehouse, returning charge lift, star-like valve, water jacket, generator, Stirling engine, insulation screw conveyor, flat heat-absorbing chamber, double-axis tracking system, controller, back bracket, column, swivel base, a strut; Wherein the heat-absorbing chamber outlet links to each other with the hot aggregate bin inlet; The hot aggregate bin outlet links to each other with the heat exchanging chamber inlet of Stirling-electric hybrid; The heat exchanging chamber inlet of Stirling-electric hybrid is controlled star-like valve inlet with hot sand flow rate and is linked to each other; The outlet that hot sand flow rate is controlled star-like valve links to each other with the inlet in cold burden storehouse, and the outlet in cold burden storehouse links to each other with the inlet of heat-absorbing chamber with the insulation screw conveyor through the returning charge lift; Stirling engine is connected with generator.Three optical blocks of solar energy are made up of primary event mirror, secondary reflection mirror, triplex reflector, double-axis tracking system and controller.A described secondary mirror, two secondary mirrors and the described surface equation of three secondary mirrors are the composite surfaces that a Rotating Double curvilinear equation or a plurality of Rotating Double curvilinear equation are formed.The Emergency Cooling System device is made up of urgent bypass outlet, water jacket, gate valve and cold burden bucket.Hot sand particle in the hot aggregate bin is put into urgent bypass outlet, and then through the water jacket cooling, the temperature cool to room temperature of hot sand particle flows into the cold burden bucket through gate valve again.
In the present embodiment, total light gathering efficiency of a described secondary mirror, two secondary mirrors and three secondary mirrors is 85%, and photo-thermal conversion efficiency is 80%; The heat radiation heat waste is 20%, and the optically focused ratio is 300, and the Stirling engine generating efficiency is 25%; Used hot sand is the SiC particle, and local intensity of solar radiation is 1kW/m 2, the sunshine duration is 8 hours, whole system operation 14 hours, and when solar radiation was arranged, the mass flow rate of the hot sand in the flat heat-absorbing chamber was 0.0174kg/s.
When the generated output of Stirling-electric hybrid was 1kW, the area of a required secondary mirror was 7.35 ㎡.The out temperature of hot sand turnover Stirling-electric hybrid heat exchanging chamber is respectively 800 ℃ and 500 ℃, and at this moment, the mass flow rate of the hot sand particle at place, hot junction is 0.00995kg/s.If guarantee uninterruptable power generation in 14 hours in a day, then hot aggregate bin need store the hot sand of 214.56kg, and at this moment, the volume of hot aggregate bin is 0.141m 3
When the generated output of Stirling-electric hybrid was 10kW, the area of a required secondary mirror was 73.5 ㎡.The out temperature of hot sand turnover Stirling-electric hybrid heat exchanging chamber is respectively 800 ℃ and 500 ℃, and at this moment, the mass flow rate of the hot sand particle at place, hot junction is 0.0995kg/s.If guarantee uninterruptable power generation in 14 hours in a day, then hot aggregate bin need store the hot sand of 2145.6kg, and at this moment, the volume of hot aggregate bin is 1.41m 3

Claims (2)

1. a hot sand thermal storage solar ability dish formula Stirling-electric hybrid electricity generating device is characterized in that comprising that Salar light-gathering tracking system, hot aggregate bin (4), urgent bypass export (5), cold burden storehouse (6), returning charge lift (7), star-like valve (8), generator (9), Stirling engine (10), insulation screw conveyor (11), flat heat-absorbing chamber (12); Cold burden storehouse (6), returning charge lift (7), insulation screw conveyor (11), flat heat-absorbing chamber (12), hot aggregate bin (4), Stirling engine (10), star-like valve (8) link to each other in order; Flat heat-absorbing chamber (12) is provided with the Salar light-gathering tracking system, and the Salar light-gathering tracking system comprises a condenser (1), secondary condensation mirror (2), triplex reflector (3), back bracket (13), double-axis tracking system (14), column (15), swivel base (16), controller (17), strut (18); Have loophole in the middle of the dish formula reflector (1) of the paraboloid of revolution, the arranged beneath of loophole has three condensers (3); The top of loophole; At vertex distance 200~4000mm place cloth secondary condensation mirror (2) from paraboloid of revolution dish formula reflector (1); Be provided with strut (18) between paraboloid of revolution dish formula reflector (1) and the secondary condensation mirror (2); The back bracket (13) of paraboloid of revolution dish formula reflector (1) is connected through double-axis tracking system (14) with column (15) one ends, and the controller (17) of double-axis tracking system (14) places on the ground, and column (15) the other end links to each other with swivel base (16).
2. the hot sand thermal storage solar that installs according to claim 1 of a use can dish formula Stirling-electric hybrid electricity-generating method; It is characterized in that: through double-axis tracking system (14); Converge to a condenser (1) below by controller (a 17) control condenser (1), secondary condensation mirror (2) and triplex reflector (3) and with sunlight; Flat heat-absorbing chamber (12), hot aggregate bin (4), Stirling-electric hybrid (10) and generator (9) arrange that on the ground on the hot sand of the irradiate light after converging in flat heat-absorbing chamber (12), the hot sand temperature in flat heat-absorbing chamber (12) outlet port reaches 800 ℃~1000 ℃; Hot sand gets into hot aggregate bin (4); Hot sand temperature stabilization in the hot aggregate bin (4) is at 700 ℃~950 ℃, and the heat exchanging chamber heat exchange after heat sand temperature stabilization of process Stirling-electric hybrid (10) is at 300 ℃~500 ℃, and Stirling-electric hybrid (10) links to each other with generator (9); Drive generator (9) generating; Hot sand flows into cold burden storehouse (6) through star-like valve (8), passes through returning charge lift (7) again and is incubated screw conveyor (11) and gets back to flat heat-absorbing chamber (12) and heat, forms circulation with this; At the overcast and rainy or night of sunlight deficiency; The heat exchanging chamber that 700 ℃~950 ℃ the hot sand that stores in the hot aggregate bin (4) gets into Stirling-electric hybrid (10) carries out heat exchange, for Stirling-electric hybrid (10) provides thermal source, guarantees the generating that generator (9) can be continual and steady; Heat exchange after heat sand temperature stabilization is at 300 ℃~500 ℃; Flow into cold burden storehouse (6) through star-like valve (8), pass through returning charge lift (7) again and be incubated screw conveyor (11) and get back to flat heat-absorbing chamber (12), form circulation with this; Under special circumstances, the hot sand in the hot aggregate bin (4) can be through urgent bypass outlet (5) discharging, and material flows into cold burden storehouse (8), improves the Safety performance of system.
CN201110127569A 2011-05-17 2011-05-17 Hot-sand-heat-accumulating solar disc type Stirling engine generating set and method thereof Active CN102155365B (en)

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CN104654609A (en) * 2013-11-17 2015-05-27 成都奥能普科技有限公司 Solid particle block tower type solar heating heat transfer system
CN105179187B (en) * 2015-09-25 2018-05-08 浙江大学 The energy storage method and its device of solar energy dish-style Stirling system
CN105508159B (en) * 2016-01-05 2018-10-30 王旭 A kind of preparation method of the solar energy hyperbolic mirror system with heat storage box
CN107062636B (en) * 2017-04-25 2019-12-10 东南大学 Composite condenser suitable for solar heat utilization

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CN201827033U (en) * 2010-09-21 2011-05-11 广东工业大学 Disc type solar Stirling heat and power cogeneration device
CN102032689B (en) * 2011-01-24 2012-11-14 上海新产业光电技术有限公司 Novel disc-type solar-powered heat collecting device and system
CN202082057U (en) * 2011-05-17 2011-12-21 浙江大学 Hot-sand heat-storage solar disc Strling generator

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