CN104279537A - Reheating solar heat utilization system and operation mode thereof - Google Patents
Reheating solar heat utilization system and operation mode thereof Download PDFInfo
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- CN104279537A CN104279537A CN201310289067.7A CN201310289067A CN104279537A CN 104279537 A CN104279537 A CN 104279537A CN 201310289067 A CN201310289067 A CN 201310289067A CN 104279537 A CN104279537 A CN 104279537A
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Abstract
The invention relates to a reheating solar heat utilization system and an operation mode thereof; the solar heat utilization efficiency is further improved. The reheating solar heat utilization system is provided with multiple sets of heat storage devices; each set of heat storage devices comprises an overheating heat accumulator, a reheating heat accumulator and an evaporation heat accumulator, wherein the overheating heat accumulator and the reheating heat accumulator are connected in series with the evaporation heat accumulator after being connected in parallel; during the heat removal process of a heat-transfer medium of heat release circulation, firstly, heat is removed from the evaporation heat accumulators and the overheating heat accumulators to apply work on a high-pressure cylinder, and then, the heat is removed from the overheating heat accumulators to apply work on a medium and low-pressure combined cylinder. The reheating solar heat utilization system disclosed by the invention has the advantages that the heat is removed for two times to apply work during a heat release process, and the heat is utilized more efficiently; meanwhile, a heat storage interval is divided into two sections by utilizing the parallel connection and the series connection of three heat accumulators, so that the heat utilization rate of a reheating process is improved.
Description
Technical field
The present invention relates to Solar Energy Heat Utilization System, particularly relate to a kind of reheating Solar Energy Heat Utilization System and the method for operation thereof.
Background technology
Solar energy is the new forms of energy that a kind of reserves are almost limitless, widely distributed, clean, and the exploitation of solar energy more and more come into one's own.Meanwhile, it is lower that solar energy also has energy density, with the feature of season, weather condition change, causes Solar use Process Energy to export unstable.By accumulation of heat, solar energy being changed into the form that can store is the main method addressed this problem, and adopts the storage of suitable system high efficiency and utilizes energy to be key issue.
Traditional Solar Energy Heat Utilization System adopts fused-salt medium, and fused salt needs to circulate in the molten state, and fused salt use amount is large, and also heat utilization efficiency is low.And also have the phase change heat accumulator with thermograde that a kind of thermal efficiency is high at present, water can be utilized as heat transfer medium, utilize fused salt as heat storage medium, effectively transform and store solar energy.As Chinese patent CN102829661A, which disclose a kind of classification phase-transition heat-storage system, the pipeline passed through for heat transfer medium is provided with in heat storage medium, and carry out heat exchange in duct wall both sides, realize being separated of heat transfer medium and heat storage medium, heat storage medium is divided some regions simultaneously, according to the region that heat transfer medium flows through, carry out accumulation of heat successively, only have when the accumulation of heat of last region is close to saturated, just can carry out the accumulation of heat in next region; Corresponding exothermic process is the reversals of accumulation of heat, when last region heat is close to getting sky, just can arrive next region heat-obtaining.Therefore said apparatus has heat availability (Exergy) height, and heat availability (Exergy) is lost little, exothermic process heat-obtaining temperature stabilization, the advantage of the aspects such as fused salt use amount is little, and difficulty of construction is low.This device also uses the phase-transition heat-storage of heat storage medium solid-liquid conversion, if more than regenerator temperature range set to heat storage medium fusing point, although heat storage medium phase-transition heat-storage cannot be utilized, but thermograde can be possessed in heat-accumulating process equally, realize high heat availability and stable heat-obtaining temperature.
But be only attached in Solar Energy Heat Utilization System by the above-mentioned regenerative apparatus possessing thermograde, the acting of exothermic process heat-obtaining is single cycle, and water is converted into high temperature and high pressure steam after regenerative apparatus heat-obtaining, and after acting, steam directly enters condenser.Because the steam temperature-pressure after heat-obtaining is high, cause still possessing higher heat and pressure from high pressure cylinder superheated steam out, but thermograde phase change heat accumulator heat-obtaining can not again be entered, become in can supplying, low pressing cylinder utilize superheated steam, thus the system heat energy of making is not utilized to greatest extent, therefore system effectiveness also has the space promoted further.
In addition, general phase change heat accumulator heat-storage medium temperature is higher, and heat exchanger tube needs to use stainless steel manufacture, and equipment cost is also higher.
Summary of the invention
The object of the invention is to for heat-energy losses after existing Solar Energy Heat Utilization System heat-obtaining acting comparatively large, there is the problem in the space promoted further, propose a kind of reheating Solar Energy Heat Utilization System, and the method for operation of this system.
The technical solution adopted for the present invention to solve the technical problems is:
A kind of reheating Solar Energy Heat Utilization System, comprise accumulation of heat circulation and heat release circulation, accumulation of heat closed circuit comprises water tank, water tank connects drum by return circulating pump, drum delivery port connects solar energy evaporation heater through forced circulation pump, and be back to drum formation vaporization cycle, drum venthole connection solar energy is crossed hot heater and is then connected regenerative apparatus accumulation of heat import, regenerative apparatus accumulation of heat outlet is connected to water tank backflow, described regenerative apparatus is at least arranged in parallel two groups, single group regenerative apparatus comprises overheating heat accumulator, reheating storage heater and evaporation storage heater, connect with evaporation storage heater after overheating heat accumulator and the parallel connection of reheating storage heater, overheating heat accumulator and reheating storage heater are positioned at accumulation of heat import side, evaporation storage heater is positioned at accumulation of heat outlet side,
Complete the regenerative apparatus after accumulation of heat and participate in heat release circulation, heat release circulation to be connected condenser, condensate pump, low-pressure heater, oxygen-eliminating device successively along loop direction, and feed pump, high-pressure heater, evaporation storage heater, overheating heat accumulator, high pressure cylinder, reheating storage heater, mesolow close cylinder, are then back to condenser;
It is contrary that overheating heat accumulator in regenerative apparatus, reheating storage heater and evaporation storage heater import and export direction in accumulation of heat circulation and heat release circulation.
Water conservancy aqueduct in drum heats through solar energy evaporation heater, the steam water interface produced returns drum, drum goes out vapour and enters solar energy and cross hot heater and add thermosetting high-temperature steam further and enter regenerative apparatus, again becomes liquid-phase reflux to recovery tank after accumulation of heat completes.System at least comprises two groups of regenerative apparatuses, when wherein one group of regenerative apparatus accumulation of heat is complete, is then switched to another regenerative apparatus and carries out accumulation of heat.Now, regenerative apparatus that can be complete to accumulation of heat as required carries out heat utilization.Often organize regenerative apparatus switchover operation between accumulation of heat and these two states of heat release.Many groups regenerative apparatus can hocket accumulation of heat and heat release, ensures the lasting supply of heat energy.Often organize regenerative apparatus and be divided into overheating heat accumulator, reheating storage heater and the accumulation of heat respectively of evaporation storage heater, effect is as follows: 1, in exothermic process, superheated steam can from overheating heat accumulator heat-obtaining to after high pressure cylinder acting, carry out reheating from reheating storage heater again and twice work doing is carried out to mesolow conjunction cylinder, improve the heat utilization efficiency of system, 2, utilize overheating heat accumulator, reheating storage heater carries out high-temperature heat accumulation, evaporation storage heater carries out low-temperature heat accumulating, the temperature span of whole group of regenerative apparatus is divided into two sections, heat utilization ratio in twice work doing process can be improved, such as, before and after whole group of regenerative apparatus accumulation of heat, variations in temperature interval is 180 ~ 560 DEG C, overheating heat accumulator and reheating storage heater variations in temperature interval are 330 ~ 560 DEG C, evaporation storage heater variations in temperature interval is 180 ~ 330 DEG C, and superheated steam drops to 315 DEG C to temperature after high pressure cylinder acting, cannot from temperature lower than heat-obtaining self heat storage medium, time now from reheating storage heater heat-obtaining, reheating storage heater can be made to run in the variations in temperature interval of setting, utilize the heat that heat-accumulating process stores completely, if directly from temperature span be heat-obtaining the storage heater of 180 ~ 560 DEG C, the heat that storage heater stores just cannot utilize completely, capacity usage ratio is caused to reduce, the running temperature of simultaneously evaporating storage heater is low, require also lower to materials and structures, the operating cost of whole group of regenerative apparatus can be reduced.
As preferably, described overheating heat accumulator, reheating storage heater and evaporation storage heater are the storage heater with thermograde, are separated into some accumulation of heat regions of connecting successively respectively.Adopt the storage heater with thermograde, can heat utilization efficiency be improved, and keep stable heat-obtaining temperature.
As preferably, described evaporation storage heater is also parallel with the bypass from overheating heat accumulator and reheating accumulator outlet direct connection water tank.The superheated steam completing overheating heat accumulator and the heat exchange of reheating storage heater in heat-accumulating process directly can get back to water tank from bypass, ensures that the glassware for drinking water in water tank has enough initial temperatures, ensures the normal operation that whole accumulation of heat circulates.
As preferably, the heat transfer medium of accumulation of heat circulation and heat release circulation is water, and heat storage medium is fused salt, the heat-transfer medium temperature of accumulation of heat import higher than the fusing point of fused salt, the heat-transfer medium temperature of accumulation of heat outlet lower than the fusing point of fused salt.Ensure in whole group of regenerative apparatus, or overheating heat accumulator and reheating storage heater, or evaporation storage heater, the phase transformation of fused salt can be utilized to carry out accumulation of heat, improve amount of stored heat.
As preferably, described overheating heat accumulator and reheating storage heater are provided with heat exchanger tube, circulation heat transfer medium in heat exchanger tube, and heat exchanger tube be outward heat storage medium, overheating heat accumulator and reheating storage heater heat exchanger tube use stainless steel material.
As preferably, described evaporation storage heater is provided with heat exchanger tube, circulation heat transfer medium in heat exchanger tube, and heat exchanger tube be outward heat storage medium, evaporation storage heater heat exchanger tube use carbon steel material.
A kind of method of operation of reheating Solar Energy Heat Utilization System, it is characterized in that: heat-accumulating process is: Water in Water Tanks enters drum after return circulating pump pressurization, to get back to drum after evaporation heater is heated into steam water interface and carry out carbonated drink with entering through forced circulation pump pressurization again after the recirculated water mixing in drum and be separated, saturated vapor after separation entered hot heater and was heated to be superheated steam, superheated steam enters wherein one group of regenerative apparatus, lower the temperature after first giving the overheating heat accumulator of this regenerative apparatus and the accumulation of heat of reheating storage heater, superheated steam after cooling gives the accumulation of heat of evaporation storage heater again, be condensed into hot water after accumulation of heat and get back to water tank, after one group of regenerative apparatus accumulation of heat completes, another group regenerative apparatus of switching carries out accumulation of heat,
Complete the wherein one group of regenerative apparatus after accumulation of heat and carry out heat release circulation, exothermic process is: water out in condenser, through condensate pump, low-pressure heater, oxygen-eliminating device, feed pump, hot water after high-pressure heater process, enter evaporation storage heater heat-obtaining, then enter overheating heat accumulator and add thermosetting high-temperature high-pressure overheat steam again, vapours is pressed through and temperature reduction in becoming after entering high pressure cylinder acting, in press through vapours enter again reheating storage heater heat-obtaining heat up formed in super pressure-high temperature superheated steam, enter mesolow and close cylinder acting, steam pressure after mesolow closes cylinder acting reduces again finally gets back to condenser.
As preferably, in heat-accumulating process, wherein a part of to the accumulation of heat of evaporation storage heater to the superheated steam of lowering the temperature after overheating heat accumulator and the accumulation of heat of reheating storage heater, the superheated steam of another part cooling directly gets back to the initial water temperature water tank maintenance water tank from bypass.
As preferably, heat-accumulating process and exothermic process carry out respectively in the regenerative apparatus of difference group simultaneously.
As preferably, fused salt in overheating heat accumulator and reheating storage heater is liquid fused salt, do not undergo phase transition, fused salt solid-liquid phase change in accumulation of heat or exothermic process in evaporation storage heater, in overheating heat accumulator and reheating storage heater, heat transfer medium does not also undergo phase transition accordingly, heat transfer medium generation liquid-gas phase transition in evaporation storage heater.
Solar Energy Heat Utilization System advantage of the present invention is: 1, carry out reheating acting in exothermic process, the steam pressure after twice work doing completes and temperature low, heat obtains higher utilization.2, arrange the storage heater of three not same-actions in regenerative apparatus, make heat transfer medium carry out heat-obtaining from different storage heaters in twice acting process, twice heat-obtaining does not interfere with each other, stable; Utilize the parallel connection of three storage heaters, with series connection, regenerator temperature interval division is become two sections simultaneously, improve again the heat utilization efficiency of thermal process.
Accompanying drawing explanation
Fig. 1 is a kind of structural representation of the present invention.
Fig. 2 is A group regenerative apparatus heat-accumulating process schematic diagram of the present invention.
Fig. 3 is B group regenerative apparatus exothermic process schematic diagram of the present invention.
In figure: 1-water tank, 2-return circulating pump, 3-drum, 4-forced circulation pump, 5-solar energy evaporation heater, 6-solar energy crosses hot heater, 7-A overheating heat accumulator, 8-A reheating storage heater, 9-A evaporates storage heater, 10-condenser, 11-condensate pump, 12-low-pressure heater, 13-oxygen-eliminating device, 14-feed pump, 15-high-pressure heater, 16-B evaporates storage heater, 17-B overheating heat accumulator, 18-B reheating storage heater, 19-high pressure cylinder, 20-mesolow closes cylinder.
Detailed description of the invention
Below by specific embodiment, also the present invention is further described by reference to the accompanying drawings.
Embodiment: a kind of reheating Solar Energy Heat Utilization System, as shown in Figure 1.This device adopts water as heat transfer medium, and adopt fused salt as heat storage medium (main component is sodium nitrate), fusing point is 308 DEG C.This device syndeton as shown in Figure 1, comprises accumulation of heat circulation and puts and circulate.Accumulation of heat circulation annexation is as follows, water tank 1 connects drum 3 by return circulating pump 2, drum connects solar energy evaporation heater 5 by forced circulation pump 4, and be back to drum formation vaporization cycle, drum venthole connects solar energy and crosses hot heater 6, solar energy is crossed hot heater and is connected to regenerative apparatus accumulation of heat import, and regenerative apparatus accumulation of heat outlet connects recovery tank; Regenerative apparatus is provided with more than two and parallel with one another, is followed successively by A group regenerative apparatus, B group regenerative apparatus etc.Each group of heat storage device structure is identical, inner also identical with outside annexation.For A regenerative apparatus, comprise A overheating heat accumulator 7, A reheating storage heater 8 and A and evaporate storage heater 9.Along heat-accumulating process loop direction, A overheating heat accumulator 7 and the parallel connection of A reheating storage heater 8, then evaporate storage heater 9 with A and connect, and A evaporation storage heater 9 is also parallel with the bypass from A overheating heat accumulator 7 and A reheating storage heater 8 direct connection water tank 1.B group regenerative apparatus is identical in A group regenerative apparatus annexation.
In heat release circulation and accumulation of heat cyclic process, the import and export direction of regenerative apparatus is contrary.Heat release circulation is illustrated with B group regenerative apparatus, closed circuit is followed successively by: condensate pump 11, low-pressure heater 12, oxygen-eliminating device 13, feed pump 14, high-pressure heater 15, B evaporate storage heater 16, B overheating heat accumulator 17, high pressure cylinder 19, B reheating storage heater 18, mesolow conjunction cylinder 20, finally get back to condenser 10.
As shown in Figure 2, in Fig. 2, solid line represents that the loop that accumulation of heat is relevant, dotted line are that heat release is correlated with but partial circuit incoherent with accumulation of heat to heat-accumulating process.Heat-accumulating process is for A group regenerative apparatus, in water tank 1,305 DEG C of hot water enter drum 3 after return circulating pump 2 pressurizes, to get back to drum 3 after evaporation heater 5 is heated into 318 DEG C of steam water interfaces and carry out carbonated drink with entering after forced circulation pump 4 pressurizes again after recirculated water mixing in drum and be separated, the saturated vapor of 318 DEG C entered the superheated steam that hot heater 6 is heated into 560 DEG C afterwards, enter A overheating heat accumulator 7 and A reheating storage heater 8 again, to the superheated steam of lowering the temperature into 330 DEG C after liquid fused salt accumulation of heat, a steam part for this parameter enters A and evaporates storage heater 9, the hot water becoming 180 DEG C to cooling after fused salt accumulation of heat gets back to water tank 1, in order to make coolant-temperature gage in water tank 1 reach 305 DEG C, another part steam directly arrives water tank 1 by bypass.Switch the accumulation of heat of B group regenerative apparatus after the accumulation of heat of A group regenerative apparatus completes, A group regenerative apparatus can carry out exothermic process simultaneously.
As shown in Figure 3, in Fig. 3, bold portion is heat release associated loop to exothermic process, and dotted portion is that accumulation of heat is correlated with but the partial circuit irrelevant with heat release.Exothermic process is for B group regenerative apparatus: 0.005MPa condensate water out in condenser 10, through condensate pump 11, low-pressure heater 12, oxygen-eliminating device 13, feed pump 14, high-pressure heater 15 becomes 8.83MPa after processing, 180 DEG C of hot water, enter B evaporation storage heater 16 heat-obtaining and become 8.83MPa, 315 DEG C of superheated steams, then enter B overheating heat accumulator 17 heat-obtaining and become 8.83MPa, 535 DEG C of superheated steams, enter after high pressure cylinder 19 does work and become 2MPa, 310 DEG C of superheated steams, again enter B reheating storage heater 18 heat-obtaining and become 2MPa, 535 DEG C of superheated steams, in entering, low pressing cylinder 20 becomes 0.005MPa moist steam after doing work, finally get back to condenser 10.Switch the heat release of A group regenerative apparatus after the heat release of B group regenerative apparatus completes, B group regenerative apparatus can carry out heat-accumulating process simultaneously.
Overheating heat accumulator and reheating storage heater variations in temperature interval are 330 ~ 560 DEG C, and evaporation storage heater variations in temperature interval is 180 ~ 330 DEG C.
A group regenerative apparatus completes accumulation of heat, after B group regenerative apparatus completes heat release, accumulation of heat, heat release power and energy can be carried out, reach the object of lasting accumulation of heat and lasting heat release, simultaneously can C group regenerative apparatus in parallel, D group regenerative apparatus ... etc. more regenerative apparatus group, meet the user demand under accumulation of heat heat release non-equilibrium state.
Claims (10)
1. a reheating Solar Energy Heat Utilization System, comprise accumulation of heat circulation and heat release circulation, it is characterized in that: accumulation of heat closed circuit comprises water tank, water tank connects drum by return circulating pump, drum delivery port connects solar energy evaporation heater through forced circulation pump, and be back to drum formation vaporization cycle, drum venthole connection solar energy is crossed hot heater and is then connected regenerative apparatus accumulation of heat import, regenerative apparatus accumulation of heat outlet is connected to water tank backflow, described regenerative apparatus is at least arranged in parallel two groups, single group regenerative apparatus comprises overheating heat accumulator, reheating storage heater and evaporation storage heater, connect with evaporation storage heater after overheating heat accumulator and the parallel connection of reheating storage heater, overheating heat accumulator and reheating storage heater are positioned at accumulation of heat import side, evaporation storage heater is positioned at accumulation of heat outlet side,
Complete the regenerative apparatus after accumulation of heat and participate in heat release circulation, heat release circulation to be connected condenser, condensate pump, low-pressure heater, oxygen-eliminating device successively along loop direction, and feed pump, high-pressure heater, evaporation storage heater, overheating heat accumulator, high pressure cylinder, reheating storage heater, mesolow close cylinder, are then back to condenser;
It is contrary that overheating heat accumulator in regenerative apparatus, reheating storage heater and evaporation storage heater import and export direction in accumulation of heat circulation and heat release circulation.
2. a kind of reheating Solar Energy Heat Utilization System according to claim 1, is characterized in that: described overheating heat accumulator, reheating storage heater and evaporation storage heater are the storage heater with thermograde, are separated into some accumulation of heat regions of connecting successively respectively.
3. a kind of reheating Solar Energy Heat Utilization System according to claim 1 and 2, is characterized in that: described evaporation storage heater is also parallel with the bypass from overheating heat accumulator and reheating accumulator outlet direct connection water tank.
4. a kind of reheating Solar Energy Heat Utilization System according to claim 1 and 2, it is characterized in that: the heat transfer medium of accumulation of heat circulation and heat release circulation is water, heat storage medium is fused salt, the heat-transfer medium temperature of accumulation of heat import higher than the fusing point of fused salt, the heat-transfer medium temperature of accumulation of heat outlet lower than the fusing point of fused salt.
5. a kind of reheating Solar Energy Heat Utilization System according to claim 1 and 2, it is characterized in that: described overheating heat accumulator and reheating storage heater are provided with heat exchanger tube, circulation heat transfer medium in heat exchanger tube, heat exchanger tube is outward heat storage medium, and overheating heat accumulator and reheating storage heater heat exchanger tube use stainless steel material.
6. a kind of reheating Solar Energy Heat Utilization System according to claim 1 and 2, is characterized in that: described evaporation storage heater is provided with heat exchanger tube, circulation heat transfer medium in heat exchanger tube, and heat exchanger tube is outward heat storage medium, and evaporation storage heater heat exchanger tube uses carbon steel material.
7. the method for operation of any described reheating Solar Energy Heat Utilization System of claim 1 ~ 6, it is characterized in that: heat-accumulating process is: Water in Water Tanks enters drum after return circulating pump pressurization, to get back to drum after evaporation heater is heated into steam water interface and carry out carbonated drink with entering through forced circulation pump pressurization again after the recirculated water mixing in drum and be separated, saturated vapor after separation entered hot heater and was heated to be superheated steam, superheated steam enters wherein one group of regenerative apparatus, lower the temperature after first giving the overheating heat accumulator of this regenerative apparatus and the accumulation of heat of reheating storage heater, superheated steam after cooling gives the accumulation of heat of evaporation storage heater again, be condensed into hot water after accumulation of heat and get back to water tank, after one group of regenerative apparatus accumulation of heat completes, another group regenerative apparatus of switching carries out accumulation of heat,
Complete the wherein one group of regenerative apparatus after accumulation of heat and carry out heat release circulation, exothermic process is: water out in condenser, through condensate pump, low-pressure heater, oxygen-eliminating device, feed pump, hot water after high-pressure heater process, enter evaporation storage heater heat-obtaining, then enter overheating heat accumulator and add thermosetting high-temperature high-pressure overheat steam again, vapours is pressed through and temperature reduction in becoming after entering high pressure cylinder acting, in press through vapours enter again reheating storage heater heat-obtaining heat up formed in super pressure-high temperature superheated steam, enter mesolow and close cylinder acting, steam pressure after mesolow closes cylinder acting reduces again finally gets back to condenser.
8. the method for operation of a kind of reheating Solar Energy Heat Utilization System according to claim 7, it is characterized in that: in heat-accumulating process, to the superheated steam of lowering the temperature after overheating heat accumulator and the accumulation of heat of reheating storage heater, wherein a part is to the accumulation of heat of evaporation storage heater, and the superheated steam of another part cooling directly gets back to the initial water temperature water tank maintenance water tank from bypass.
9. the method for operation of a kind of reheating Solar Energy Heat Utilization System according to claim 7 or 8, is characterized in that: heat-accumulating process and exothermic process can carry out respectively in the regenerative apparatus of difference group simultaneously.
10. the method for operation of a kind of reheating Solar Energy Heat Utilization System according to claim 7 or 8, it is characterized in that: the fused salt in overheating heat accumulator and reheating storage heater is liquid fused salt, do not undergo phase transition, fused salt solid-liquid phase change in accumulation of heat or exothermic process in evaporation storage heater, in overheating heat accumulator and reheating storage heater, heat transfer medium does not also undergo phase transition accordingly, heat transfer medium generation liquid-gas phase transition in evaporation storage heater.
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| CN201310289067.7A CN104279537B (en) | 2013-07-11 | 2013-07-11 | A kind of reheating Solar Energy Heat Utilization System and its method for operation |
| PCT/CN2014/077987 WO2014187317A1 (en) | 2013-05-22 | 2014-05-21 | Phase change heat storage apparatus, solar heat utilization system using apparatus, and operating mode |
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| CN201310289067.7A CN104279537B (en) | 2013-07-11 | 2013-07-11 | A kind of reheating Solar Energy Heat Utilization System and its method for operation |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108061395A (en) * | 2017-12-08 | 2018-05-22 | 北京兆阳光热技术有限公司 | Solar-thermal generating system and photo-thermal power station |
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| CN108061395A (en) * | 2017-12-08 | 2018-05-22 | 北京兆阳光热技术有限公司 | Solar-thermal generating system and photo-thermal power station |
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