CN105674588A - Multi-secondary reflection tower-confocal solar photothermal mirror field system - Google Patents
Multi-secondary reflection tower-confocal solar photothermal mirror field system Download PDFInfo
- Publication number
- CN105674588A CN105674588A CN201610200839.9A CN201610200839A CN105674588A CN 105674588 A CN105674588 A CN 105674588A CN 201610200839 A CN201610200839 A CN 201610200839A CN 105674588 A CN105674588 A CN 105674588A
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- Prior art keywords
- mirror
- secondary reflection
- tower
- mirror field
- confocal
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Classifications
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- 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
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24S—SOLAR HEAT COLLECTORS; SOLAR HEAT SYSTEMS
- F24S23/00—Arrangements for concentrating solar-rays for solar heat collectors
- F24S23/70—Arrangements for concentrating solar-rays for solar heat collectors with reflectors
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- 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
Abstract
The invention relates to a multi-secondary reflection tower-confocal solar photothermal mirror field system. The system consists of multiple mirror field combination modules and a heat absorber; each mirror field combination module consists of a mirror field and a secondary reflection tower; the mirror fields gather secondary reflection light rays into the heat absorber near the ground through secondary reflecting mirrors in the secondary reflection towers; the mirror fields are elliptical mirror fields or rhombic mirror fields formed by multiple heliostats; and the mirror field combination modules are tightly arranged. The system is reasonable in design, only selects an area with the highest cosine efficiency of north mirror fields, improves the optical efficiency to the greatest extent, saves the number of the heliostats under the same scale, largely reduces the unit cost of a power station, adopts the narrow and long elliptical or rhombic single-side mirror fields, is more flexible in modular combination policy of the mirror fields, and largely reduces the earth waste.
Description
Technical field
The present invention relates to the confocal solar energy heat mirror field system of a kind of many secondary reflections tower, belong to photo-thermal power generation technical field.
Background technology
Tower type solar energy thermal power generation technology has caused the broad interest of energy field in the world, has power using fused salt as the tower solar-thermal generating system of heat transfer medium big, the advantages such as efficiency is high, and heat storage capacity is strong, stable. The heat extractor of typical tower fused salt solar-thermal generating system is installed on optically focused column overhead, heat extractor is formed by endothermic tube is densely arranged, caliber is thinner, tube wall is relatively thin, in running, easily there is frozen block and crosses thermal condition in endothermic tube, influential system properly functioning, and need high-power pump for liquid salts that working medium pump is delivered to optically focused tower top, system is higher from power consumption.
In order to avoid the various technical risks of typical tower fused salt opto-thermal system, changing light path by secondary reflection tower, the secondary reflection photothermal technique that heat extractor is placed in ground arises at the historic moment. Opticai Concentrating System With Secondary Reflection includes field, settled date border, secondary reflection tower and heat extractor, sunray converges to secondary reflection tower through heliostat field, the sunray that heliostat field is focused on by secondary reflection tower carries out secondary focusing, and secondary reflection tower is by sunray secondary focusing to heat extractor. 360 ° of all-round Jing Chang of the many employings of heliostat field of this system, secondary reflection mirror many employings hyperboloid of revolution, system optical axis is the rotating shaft of this curved surface, and optical axis is vertically. Ground heat extractor is opening up, and the heat-transfer working medium that heat extractor uses is with fused salt, supercritical carbon dioxide, gas, solid particle etc.
One power station adopting secondary reflection technology, generally adopts multiple secondary reflection towers, has a heat extractor immediately below each tower, and the hot working fluid of generation is pooled in the Large Copacity heat-accumulator tank in conventional island supply station allotment by interconnecting piping and generates electricity.
But for middle high latitude area, the optical efficiency of Nan Jingchang is more much lower than northern mirror field, same energy output needs more heliostat. Existing secondary reflection Jing Chang adopts ring arrangement, and the north and south span of Jing Chang and west and east span are more or less the same, and single column single module is larger, can waste substantial amounts of soil when power station modular layout; Existing secondary reflection mirror optical axis is both along vertical direction, and a heat extractor is set under every tower, working medium after heating requires over the Large Copacity heat-accumulator tank that longer pipeline converges in conventional island, and thermal technology's operational mode is more complicated, and long-distance pipe heat radiation is bigger.
Summary of the invention
It is an object of the invention to: existing needs can not be met for current technology, there is provided a kind of many secondary reflections tower confocal solar energy heat mirror field system, this system only selects the region that mirror field, north cosine is most effective, improve optical efficiency to greatest extent, saving heliostat quantity under same size, power station unit cost is greatly reduced, and adopts long and narrow ellipse or rhombus one side Jing Chang, the strategy carrying out mirror field modular combination is more flexible, greatly reduces the waste in soil.
The technical solution adopted in the present invention is: the confocal solar energy heat mirror field system of a kind of many secondary reflections tower, it is made up of some mirror field composite modules and a heat extractor, described each mirror field composite module is constituted by Jing Chang and secondary reflection tower, Jing Chang passes through the secondary reflection mirror in secondary reflection tower by secondary reflection light collection to subaerial heat extractor, wherein, ovalize Jing Chang that Jing Chang is made up of some heliostats or rhomb-scope field, be closely arranged together between the composite module of mirror field.
In the present invention: described Jing Chang is that secondary reflection tower is left the Bei Jingchang of string efficiency highest zone.
In the present invention: the described hyperboloid that secondary reflection mirror is different focal or the reflection border of ellipsoid, the light of each Jing Chang all focuses on the upper focus of respective secondary reflection mirror, and jointly converges in public lower focus and the heat extractor at place near the ground.
Beneficial effects of the present invention:
1. a region that mirror field, selection north cosine is most effective, improves optical efficiency to greatest extent, saves heliostat quantity under same size, and power station unit cost is greatly reduced;
2. adopting long and narrow ellipse or rhombus one side Jing Chang, the strategy carrying out mirror field modular combination is more flexible, greatly reduces the waste in soil;
3. the secondary reflection mirror (hyperboloid or ellipsoid) of different focal has been customized for every piece of Jing Chang, the light of each Jing Chang all focuses on the upper focus of respective secondary reflection mirror, and jointly converge in the heat extractor at place near the ground (public lower focus), practical operation can reach arbitrarily high focusing ratio.
Accompanying drawing explanation
Fig. 1 is the system schematic of the present invention;
Fig. 2 is the system schematic of the oval shape mirror field in the present invention;
Fig. 3 is the system schematic of the rhomb-scope field in the present invention;
Fig. 4 is day in Spring Equinox cosine efficiency distribution figure in the Northern Hemisphere in the present invention.
Wherein: 1. Jing Chang; 2. secondary reflection tower; 3. secondary reflection light; 4. heat extractor.
Detailed description of the invention
Below in conjunction with the drawings and specific embodiments, the present invention is described in further detail.
Embodiment 1
The present embodiment adopts oval shape mirror field, as shown in Figure 2, a kind of confocal solar energy heat mirror field system of many secondary reflections tower, form including 7 mirror field composite modules and a heat extractor 4, closely it is arranged together between the composite module of mirror field, in the arrangement mode of four after first three, wherein each mirror field composite module is constituted by an oval shape mirror field 1 and a secondary reflection tower 2, secondary reflection light 3 is converged in subaerial heat extractor 4 by oval shape mirror field 1 by the secondary reflection mirror in secondary reflection tower 2, and the height of front row secondary reflection tower 2 must not block heel row secondary reflection tower 2 and be reflexed to by secondary reflection light 3 in heat extractor 4.
Embodiment 2
The present embodiment adopts rhomb-scope field, as shown in Figure 3, a kind of confocal solar energy heat mirror field system of many secondary reflections tower, form including 7 mirror field composite modules and a heat extractor 4, closely it is arranged together between the composite module of mirror field, in the arrangement mode of four after first three, wherein each mirror field composite module is constituted by a rhomb-scope field 1 and a secondary reflection tower 2, secondary reflection light 3 is converged in subaerial heat extractor 4 by rhomb-scope field 1 by the secondary reflection mirror in secondary reflection tower 2, and the height of front row secondary reflection tower 2 must not block heel row secondary reflection tower 2 and be reflexed to by secondary reflection light 3 in heat extractor 4. wherein, secondary reflection mirror is the reflection border of the hyperboloid of different focal or ellipsoid, and the light of each Jing Chang all focuses on the upper focus of respective secondary reflection mirror, and jointly converges in public lower focus and the heat extractor at place near the ground. mathematical hyperboloid or ellipsoid have two focuses, and it is incident that converging light is directed at one of them focus, reflexes to another focus, and upper focus here is exactly the virtual point that the secondary reflection mirror back side is aerial, and lower focus is exactly heat extractor opening part. due to such secondary reflection module can spatially combination in any, its focusing ratio at heat extractor place is any superposition, it is possible to reach any high concentration ratio.
As shown in Figure 4, in figure, coordinate represents the planar dimension of Jing Chang in length and breadth, and moire scattergram illustrates cosine efficiency value during high noon in the Spring Equinox, and color is more shallow, and efficiency is more high. The region that Northern Hemisphere cosine is most effective has been selected in oval shape mirror field in the present invention or rhomb-scope field 1, it is all that and then the sun rotates due to heliostat, but not in the face of the sun, its reflecting surface normal is inevitable with solar incident angle at an angle, and each position is not in the same time in change, the cosine distribution generally taking high noon in the Spring Equinox when designing mirror field approaches the average of the whole year. The secondary reflection tower 2 of every piece of mirror field 1 correspondence is all located at " the white circle position " of Fig. 4, and compared to the circular Jing Chang of typical case's secondary reflection, whole efficiency is substantially improved, thus the heliostat quantity significantly reduced in same size system.
In practical operation, can be as required, mirror field composite module in Fig. 2 and Fig. 3 can also constantly extend, mirror field composite module specifically can be arranged according to the shape of landform, thus realizing high installed capacity of power station, and reach arbitrarily high focusing ratio at heat extractor focal plane place, thus driving the heat-exchange working medium of various temperature spot, and under same equitemperature by heat extractor improved efficiency to ultimate attainment.
Do not have a strong impact under the premise of cosine efficiency, secondary reflection tower in the composite module of mirror field can not on sustained height, position in horizontal plane can also fine tune, the secondary tower of front and rear row has difference in height, such that it is able to effectively prevent front-seat secondary reflection tower blocking heel row.
Above the specific embodiment of the present invention is described, but the present invention is not limited to above description. For a person skilled in the art, any equal amendment to the technical program and replacement are all within the scope of the invention. Therefore, the equalization made without departing from the spirit and scope of the invention converts and amendment, all should contain within the scope of the invention.
Claims (3)
1. the confocal solar energy heat mirror field system of secondary reflection tower more than a kind, it is characterized in that: be made up of some mirror field composite modules and a heat extractor, described each mirror field composite module is constituted by Jing Chang and secondary reflection tower, Jing Chang passes through the secondary reflection mirror in secondary reflection tower by secondary reflection light collection to subaerial heat extractor, wherein, Jing Chang by some heliostats form in oval long and narrow Jing Chang or rhomb-scope field, be closely arranged together between the composite module of mirror field.
2. the confocal solar energy heat mirror field system of a kind of many secondary reflections tower according to claim 1, it is characterised in that: described Jing Chang is that secondary reflection tower is left the Bei Jingchang of string efficiency highest zone.
3. the confocal solar energy heat mirror field system of a kind of many secondary reflections tower according to claim 1, it is characterized in that: the described hyperboloid that secondary reflection mirror is different focal or the reflection border of ellipsoid, the light of each Jing Chang all focuses on the upper focus of respective secondary reflection mirror, and jointly converges in public lower focus and the heat extractor at place near the ground.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610200839.9A CN105674588A (en) | 2016-04-05 | 2016-04-05 | Multi-secondary reflection tower-confocal solar photothermal mirror field system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201610200839.9A CN105674588A (en) | 2016-04-05 | 2016-04-05 | Multi-secondary reflection tower-confocal solar photothermal mirror field system |
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| CN105674588A true CN105674588A (en) | 2016-06-15 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110057116A (en) * | 2019-04-04 | 2019-07-26 | 浙江中控太阳能技术有限公司 | A kind of tower type solar photo-thermal Jing Chang and its arrangement method based on secondary reflection |
| CN110647174A (en) * | 2018-06-27 | 2020-01-03 | 沈平 | Vertical-horizontal integrated double-shaft speed reduction transmission system based on friction transmission |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110647174A (en) * | 2018-06-27 | 2020-01-03 | 沈平 | Vertical-horizontal integrated double-shaft speed reduction transmission system based on friction transmission |
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Application publication date: 20160615 |