CN102721194B - Large-capacity high-concentrating ratio composite Fresnel line concentration reflection device - Google Patents
Large-capacity high-concentrating ratio composite Fresnel line concentration reflection device Download PDFInfo
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- CN102721194B CN102721194B CN201210246997.XA CN201210246997A CN102721194B CN 102721194 B CN102721194 B CN 102721194B CN 201210246997 A CN201210246997 A CN 201210246997A CN 102721194 B CN102721194 B CN 102721194B
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- 239000002131 composite material Substances 0.000 title abstract 5
- 150000001875 compounds Chemical class 0.000 claims description 9
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- 239000000203 mixture Substances 0.000 claims description 3
- 238000010248 power generation Methods 0.000 claims description 2
- 230000000694 effects Effects 0.000 abstract description 21
- 238000005516 engineering process Methods 0.000 description 5
- 230000001143 conditioned effect Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 230000011514 reflex Effects 0.000 description 3
- 241000127225 Enceliopsis nudicaulis Species 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000001154 acute effect Effects 0.000 description 1
- 239000012141 concentrate Substances 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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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 solar heat collector with a focusing element, and in particular relates to a large-capacity high-concentrating ratio composite Fresnel line concentration reflection device. The large-capacity high-concentrating ratio composite Fresnel line concentration reflection device is structurally characterized in that a main reflection device comprises a plurality of microarc Fresnel reflection lenses which are used as main reflection mirrors, a steering device is arranged at the center of each Fresnel reflection lens, the plurality of Fresnel reflection lenses are positioned above a heat collection pipe and distributed in an arc shape by taking the heat collection pipe as a circle center, the large-capacity high-concentrating ratio composite Fresnel line concentration reflection device further comprises an auxiliary reflection device which is arranged under the heat collection pipe, and an arc-shaped convex surface (concentrating surface) faces towards the direction of the heat collection pipe. The large-capacity high-concentrating ratio composite Fresnel line concentration reflection device has the advantages of obtaining larger ground utilization ratio, adequately considering the incident conditions of sunshine, greatly reducing the sunshine loss, improving the heat collection effect of the heat collection pipe, realizing good focusing effect as well as effect of leading the heat collection pipe to be evenly heated, and showing the large-capacity concentrating effect.
Description
Technical field
The present invention relates to a kind of solar thermal collector with concentrating element, particularly a kind of Large Copacity high concentration ratio compound Fresnel line condensing reflection device.
Background technology
Fresnel Lenses has optically focused effect, in the application of the large-scale beam condensing unit of solar energy thermal-power-generating, and main employing reflective Fresnel equipment.In prior art, the kind of Fresnel reflection unit is a lot, as close-coupled line focus fresnel reflector (the Compact Linear Fresnel Reflector of extensive use, be called for short CLFR), be made up of, with reference to patent ZL200880112788.8 a plurality of fresnel reflecting mirror of compact arrangement and the solar energy heat collection pipe of top that are distributed in below; Also having parabola solar trough concentrating system, is also conventional solar energy thermal-power-generating beam condensing unit, and speculum that it uses adopts parabola shaped, and concave surface is towards solar direction, and above concave surface, assemble that position arranges too can thermal-collecting tube; Also have tower beam condensing unit, it comprises the tower type solar collecting apparatus being positioned at central point and the multi-layer annular parabola dish-style Fresnel reflection device being the outside Boulez in the center of circle with this center; In addition, also has a kind of Fresnel line condensing reflection device of secondary reflection, it is on the basis of similar CLFR structure, secondary reflection cover is set on thermal-collecting tube top, with reference to disclosures in Italian patent application RM2010A000437, in order to sunlight is reflexed to thermal-collecting tube top, with the heat absorption of balanced thermal-collecting tube, also scatter and disappear for reflecting the sunlight caused because of focusing error, this is mainly because of the difference of bottom reflection eyeglass due to incidence angle, and the focusing distance when different angles is different.
But there is many weak points in beam condensing unit described above: the capacity of tower beam condensing unit and parabola dish-style beam condensing unit is little, the more tower beam condensing unit of parabola solar trough concentrating system capacity and parabola dish-style beam condensing unit large, it is one conventional at present, but be usually no more than 100MW, and the capacity of CLFR can do more and cost is lower, but then there is following problem in CLFR capacious:
First, as shown in Figure 1, when sunlight Y vertical irradiation, in order to reverberation is not obstructed, need certain interval S between neighboring reflection eyeglass 1, to avoid reflected light to be blocked by near that reflecting optics of thermal-collecting tube 2, and from thermal-collecting tube more away from the interval that needs of reflecting optics larger, this just causes sunlight and reveals, and have impact on ground utilization rate.If sunlight casts oblique rays on to reflecting optics from the far-end (namely away from thermal-collecting tube) of thermal-collecting tube, the interval between reflecting optics also needs further increasing, and this can cause the sunlight more strengthened to leak.In figure, β is the angle between the boundary a that is not blocked of the vertical line of thermal-collecting tube and principal reflection device and principal reflection eyeglass reverberation, the x length that to be thermal-collecting tube extend to both sides perpendicular to the point of principal reflection device, when mirror widths enough little (namely trending towards 0 in theory) time, can calculate when reflection is not stopped, in the x width shown in Fig. 1, the effective width of speculum is under these conditions d*ln (x/d+
, when x is equal with the height d of thermal-collecting tube, the effective width of speculum is approximately 0.88 times of d; When x is 2 times of d, the effective width of speculum is approximately 1.444 times of d; When x is 3 times of d, the effective width of speculum is approximately 1.818 times of d.The wider then validity of width of visible reflectance mirror is poorer.The width of the speculum of practical application can not → 0, can prove, above formula is the maximum effective width that can obtain, and the width of single speculum is wider, and the effective width in certain x is less.
Secondly, the radian of the reflector plate of current CLFR is nonadjustable, and 1 is that the speculum distance set heat pipe of mid portion is closer, and the speculum distance set heat pipe of both sides is distant, if all speculums are all the same radians, will certainly some focusing mirror effect bad; Although 2 is that speculum can rotate with the change of sunlight angle, the distance at mirror center and thermal-collecting tube center is constant, but with the difference of solar angle degree, the position of reflecting mirror focal length will change, as accompanying drawing 2 and accompanying drawing 3, sunlight becomes 30 ° of angles during with speculum (see accompanying drawing 3), the half of (see accompanying drawing 2) when its focusing distance (mirror center is to the distance of focusing center) only has sunlight vertical with speculum.
In addition, the thermal-collecting tube of CLFR just single (under) side is heated, is heated uneven, this have impact on temperature and the caloric receptivity of thermal-collecting tube.
The Fresnel line condensing reflection device of secondary reflection can reduce scattering and disappearing of sunlight, but just at heat collector place, some problems that speculum exists and CLFR is same, cause the limitation improved, the effect improved is uncontrollable, namely different solar angle is different, in fact be if optically focused is accurate, secondary reflection device is unwanted, but horizontally disposed reflecting optics is difficult to accomplish, unless the radian of reflecting optics also changes during reflection angle change, secondary reflection cover top also can keep the sun off.
Summary of the invention
The object of the invention is to overcome the deficiencies in the prior art part, and it is few to propose that a kind of Large Copacity, ground utilization rate are high, sunlight scatters and disappears, focusing effect and the good Large Copacity high concentration ratio compound Fresnel line condensing reflection device of Heat-collecting effect.
The present invention is achieved through the following channels:
Large Copacity high concentration ratio compound Fresnel line condensing reflection device, include principal reflection device and thermal-collecting tube, its structural feature is, principal reflection device by a plurality of with differential of the arc fresnel reflecting mirror for principal reflection eyeglass forms, the center of each fresnel reflecting mirror is provided with transfer, and this plurality of Fresnel reflection eyeglass is positioned at the top of thermal-collecting tube, in a kind of take thermal-collecting tube as the linear distribution of the circular arc in the center of circle, the inner concave arc surface of each fresnel reflecting mirror is all towards sunlight incident direction simultaneously, when the direction of sunlight is parallel with the central point of the speculum of principal reflection device and the line of centres of thermal-collecting tube, this sheet speculum carries out the upset of 180 °, also include a kind of secondary reflection unit, it is arranged on below thermal-collecting tube, and arc concave surface is towards thermal-collecting tube direction.
Described transfer can make fresnel reflecting mirror overturn according to the incident angle of sunlight.The fresnel reflecting mirror of the differential of the arc can make the larger reflecting optics of monolithic width focus on the less thermal-collecting tube of diameter, thus obtains higher sunlight utilization rate.And in order to reach higher ground utilization rate, the process of Water demand sunray change is on the impact of spotlight effect: for the situation that sunlight is parallel to the direction of thermal-collecting tube with mirror center, speculum is difficult to the thermal-collecting tube that flashes back the sunlight, the utilization of this part sunlight needs by secondary reflection unit, its periphery sunlight and speculum have the eyeglass of certain angle by reflect focalization, but may can to leak by some sunlight to thermal-collecting tube direction.
Fresnel reflecting mirror in principal reflection device adopts differential of the arc structure, this differential of the arc is parabola shaped, and focus is at thermal-collecting tube place, because focal length camber line is distant, so radian can not be very large, the design of differential of the arc speculum, reasonability is had in technology and economic aspect, mirror width is more much larger than the external diameter of thermal-collecting tube, the differential of the arc focus on make it possible to reasonable Arrangement reflecting optics in the larger context quantity (when condition suitable or easy to make, the reflecting optics of the shapes such as flat board and circle also can adopt), thus improve focusing ratio.When the direction of sunlight is parallel with the speculum of principal reflection device and the line of centres of thermal-collecting tube, this sheet speculum needs the upset doing about 180 °, to change reflection direction.
The object of secondary reflection unit has two: the utilizing status being first improved luminous energy, at the near sites that the direction of sunlight is parallel with the speculum of principal reflection device and the line of centres of thermal-collecting tube, the eyeglass of principal reflection device is due to the restriction of position, be difficult to reflection ray, at this moment allow ray cast arrive subreflector, this part light is obtained and utilizes; Next is that the ray cast of secondary reflection unit has arrived the position that on thermal-collecting tube, principal reflection mirror cannot be irradiated to, and makes being heated of thermal-collecting tube more even, improves working condition and the heat-transfer effect of thermal-collecting tube.
Principal reflection device is the center of circle with thermal-collecting tube by this employing, and to be that circular arc is linear be distributed in heat collection tube, and the technical scheme of secondary reflection unit is set below thermal-collecting tube, Fresnel line condensing reflection device of the present invention can be made to obtain higher ground utilization rate, take into full account the condition of incidence of sunlight, greatly reduce scattering and disappearing of sunlight, improve the Heat-collecting effect of thermal-collecting tube, achieve good focusing effect and the effect to thermal-collecting tube thermally equivalent simultaneously, meet the demand of jumbo high concentration ratio.
The present invention can be specially further:
Secondary reflection unit is a kind of parabola shaped condenser mirror speculum, this speculum is provided with driving transfer.
Described secondary reflection unit as parabola solar trough concentrating system, can drive transfer effect under tracks sunlight, can fully effective sunlight be focused on thermal-collecting tube.
The angle φ that the two ends, position of principal reflection device and secondary reflection unit same widths and thermal-collecting tube central point are formed, may be used for the width determining secondary reflection unit, for the main condenser of differing heights, as long as the angle φ of subreflector impact is identical, the effect of subreflector is just identical.
From physical dimension, spacing between principal reflection mirror is mirror width one half, principal reflection mirror can 180 ° of upsets, by calculating, at this moment, select the width b of secondary reflection unit to make about 85.88 ° of φ (its condition is cos φ/2-2sin φ/4=0), can make do not have sunlight to leak beyond this scope.Principal reflection mirror is arranged according to the method described above, and under the poorest conditioned reflex (situation that namely the distribution circular arc of sunlight and principal reflection eyeglass is tangent), the reflection of sunlight has sub-fraction to be obstructed.
If reach 100% sunlight utilization rate, the spacing between principal reflection mirror increases to mirror width half
doubly, the principal reflection mirror light that (situation that namely the distribution circular arc of sunlight and principal reflection eyeglass is tangent) does not have leakage and hinder under the poorest conditioned reflex can be made, at this moment subreflector width b make φ be approximately 103.65 ° (its condition is cos φ/2-
sin φ/4=0) time do not have sunlight to leak, in the scope of corresponding subreflector width, the eyeglass of principal reflection mirror is parallel with sunlight, makes light enter subreflector, and project principal reflection mirror projection less than the thermal-collecting tube back side.
The present invention can also be specially further:
Secondary reflection unit is a plurality of differential of the arc or plane mirror composition reflective Fresnel mirror, and this plurality of reflecting optics be centrally located on same straight line, arc-shaped concave central vertical line points to and focuses on thermal-collecting tube center.
Described secondary reflection unit eyeglass is arranged as the CLFR beam condensing unit mentioned before, and fresnel reflecting mirror is wherein as subreflector, and angle of inclination is fixing, take thermal-collecting tube as focus optically focused.The reflecting effect of the secondary reflection unit of this structure is not as parabola shaped condenser mirror, but difference is very little, and the benefit brought is easily manufactured, and cost is low.
When subreflector width is enough little and overall width is x, the usable reflection width of every sheet subreflector is approximately
=
, wherein β is shown in shown in accompanying drawing 1, for the vertical line of thermal-collecting tube and secondary reflection unit and fresnel reflecting mirror reflection ray are not blocked formed angle, due to cos β≤cos (β/2) when β is acute angle, or cos β≤
≤
, so
(CLFR beam condensing unit usable reflection width)≤
(overall tracking fresnel reflecting mirror usable reflection width), that is its effective reflective surface area Integral swinging CLFR beam condensing unit of swinging situation than monolithic is good, the entirety of secondary reflection unit is followed solar angle and is swung, can tracks sunlight automatically.
The linear central angle of the circular arc that fresnel reflecting mirror in principal reflection device is formed for the center of circle with thermal-collecting tube can be 360 °, also can be less than 360 °.
That is, be that the center of circle is covered with by principal reflection mirror 360 ° (i.e. whole circle) with thermal-collecting tube, like this can when sunlight tilt, the optically focused width remained unchanged, to maintain larger optically focused amount.But the spatial distribution of 360 ° may bring comparatively loaded down with trivial details process in realization, therefore generally takes central angle, the angle that namely principal reflection device arc both sides end points and the center of circle, thermal-collecting tube place are formed is 140 ° ~ 160 °.That concentrates is distributed in heat collection tube by principal reflection device, to obtain the simply way of effective embodiment.
The transfer of the fresnel reflecting mirror in described principal reflection device includes reflector mount, rotating shaft and support, speculum to be arranged on reflector mount and to form rotor, reflector mount is rotatably supported on support by rotating shaft, rotating shaft core is positioned on the reflection direction of speculum, and this rotating shaft core is positioned at the thickness of speculum; Arrange a kind of counterweight, this counterweight is connected with rotor, and is arranged on the extension line of rotor center of gravity and rotating shaft core line.
Speculum is basal plane according to its reflection cambered surface, side, concave arc place is reflection direction, side, convex arc place is direction, the back side, and the reflection direction of indication is not reflected ray direction herein, and refers to section in the middle of speculum cambered surface (or mirror environment profile formed plane) normal direction.Utilize this counterweight can balance the rotating torque brought due to rotor deviation of gravity center rotating shaft core.
Distance between at the bottom of the line on upper and lower two summits of speculum cancave cambered surface and concave arc is the thickness of speculum.
In order to reduce the rotating torque of reflector, the distance of rotating shaft core and rotor (speculum and reflector mount) center of gravity should be shortened until the two overlaps; Again because some speculum need overturn 180 °, if this rotating shaft core is positioned at outside the thickness of speculum, additionally will take up room, cause whole solar array not compact.
In sum, the invention provides a kind of Large Copacity high concentration ratio compound Fresnel line condensing reflection device, is a kind ofly sacrifice a small amount of sunlight utilization rate and obtain larger focusing ratio and more convenient rational space is arranged.Adopt and principal reflection device is distributed in heat collection tube with thermal-collecting tube center for the center of circle is that circular arc is linear, and the technical scheme of secondary reflection unit is set below thermal-collecting tube, Fresnel line condensing reflection device of the present invention can be made to obtain larger ground utilization rate, take into full account the condition of incidence of sunlight, greatly reduce scattering and disappearing of sunlight, improve the Heat-collecting effect of thermal-collecting tube, achieve good focusing effect and the effect to thermal-collecting tube thermally equivalent simultaneously, meet the demand of jumbo high concentration ratio.
Accompanying drawing explanation
Fig. 1 is the analytical structure schematic diagram of the CLFR described in background technology of the present invention under sunlight vertical irradiation;
Fig. 2 is the focusing structure schematic diagram of the CLFR described in background technology of the present invention when sunlight is vertical with speculum;
Fig. 3 is the focusing structure schematic diagram of the CLFR described in background technology of the present invention when sunlight and speculum are 30 ° of angles;
Fig. 4 is the structural representation of embodiment 1 of the present invention;
Fig. 5 is the structural representation of most preferred embodiment of the present invention;
Fig. 6 is the structural representation of fresnel reflecting mirror in principal reflection device of the present invention.
Below in conjunction with accompanying drawing, the present invention is described further.
Detailed description of the invention
Embodiment 1:
With reference to accompanying drawing 4, Large Copacity high concentration ratio compound Fresnel line condensing reflection device, include principal reflection device 1 and thermal-collecting tube 2, principal reflection device 1 is that principal reflection mirror forms by a plurality of differential of the arc fresnel reflecting mirror, the center of each fresnel reflecting mirror is provided with transfer 3, and this plurality of Fresnel reflection eyeglass is positioned at the top of thermal-collecting tube 2, in a kind of be the center of circle with thermal-collecting tube, radius is the linear distribution of the circular arc of R, the angle that principal reflection device 1 arc both sides end points and the center of circle, thermal-collecting tube 2 place are formed is generally 140 ° ~ 160 °, namely the angle qe that the line in arc two ends and the center of circle, thermal-collecting tube 2 place and horizontal plane are formed is 10 ~ 20 °.Simultaneously the inner concave arc surface of each fresnel reflecting mirror is all towards the direction having sunlight incidence, can the incident direction of tracks sunlight, and rotates thereupon; When the direction of sunlight is parallel with the speculum of principal reflection device and the line of centres of thermal-collecting tube, this sheet speculum carries out the upset of 180 °.Thermal-collecting tube can be glass-vacuum tube, also can be thermal-collecting tube or the photovoltaic power generation apparatus of other types.Principal reflection eyeglass is generally arranged symmetrically with on circular arc, also can unsymmetrical arrangement.
Also include a kind of secondary reflection unit 4, it is arranged on below thermal-collecting tube 1, for one parabola shaped (or Fresnel type) condenser mirror (subreflector), this subreflector is provided with driving transfer, this driving transfer can be that the additional drive unit of the revolving member be directly installed on subreflector center line is formed, and also can be to be made up of the turning cylinder be arranged on the triangle of subreflector or center of circle bracing frame and bracing frame and drive unit.The arc concave surface of subreflector towards thermal-collecting tube direction, drive transfer effect under tracks sunlight incident direction.
Spacing between principal reflection mirror is mirror width one half, principal reflection mirror can 180 ° of upsets, by calculating, at this moment, select the width b of secondary reflection unit to make about 85.88 ° of φ (its condition is cos φ/2-2sin φ/4=0), can make do not have sunlight to leak beyond this scope.
Spacing between principal reflection mirror increases to mirror width half
doubly, the principal reflection mirror light that (situation that namely the distribution circular arc of sunlight and principal reflection eyeglass is tangent) does not have leakage and hinder under the poorest conditioned reflex can be made, reach the sunlight utilization rate of 100%, at this moment subreflector width b makes about 103.65 ° of φ (its condition is cos φ/2-
sin φ/4=0) time do not have sunlight to leak, in corresponding scope, the eyeglass of principal reflection mirror is parallel with sunlight, makes light enter subreflector, and project principal reflection mirror project less than the thermal-collecting tube back side.
With reference to accompanying drawing 6, the transfer 3 of fresnel reflecting mirror comprises reflector mount 31, rotating shaft 32, counterweight 33 and support (not shown in FIG.), speculum 5 to be arranged on reflector mount 31 and to form rotor, reflector mount 31 is rotatably supported on support by rotating shaft 32, rotating shaft 32 axle center is positioned on the reflection direction of speculum, namely the C direction in Fig. 6, and, this rotating shaft 32 axle center be also positioned at speculum thickness and at 1/2nd thickness places of speculum, A in speculum thickness and Fig. 1, simultaneously, rotating shaft 32 axle center is also positioned on the line of symmetry in mirror width direction.Speculum 5 is basal plane according to its reflection cambered surface, and side, concave arc place is reflection direction, the C direction namely in Fig. 6; Side, convex arc place is direction, the back side, 6 directions namely in Fig. 1.Distance between at the bottom of the line on upper and lower two summits of speculum cancave cambered surface and concave arc is the thickness of speculum, the A namely in Fig. 6.Counterweight 33 is a kind of pendulum model structures, comprises the elongated body of rod and the hammer body of tail end, and the body of rod other end is fastenedly connected by a kind of structure of screw bolt and rotor, and counterweight 33 is arranged on the extension line of rotor center of gravity and rotating shaft 32 axial connecting line.Speculum 5 two ends are coaxially arranged with rotating shaft 32 respectively, and the corresponding support and connection of this two rotating shaft 32 are in the supported hole of support, and like this, whole rotor is across propping up on support.
Most preferred embodiment:
With reference to accompanying drawing 5, Large Copacity high concentration ratio compound Fresnel line condensing reflection device, include principal reflection device 1 and thermal-collecting tube 2, principal reflection device 1 is that principal reflection mirror forms by a plurality of differential of the arc Fresnel reflection eyeglass, the center of each fresnel reflecting mirror is provided with transfer 3, and this plurality of fresnel reflecting mirror is positioned at the top of thermal-collecting tube 2, in a kind of be the center of circle with thermal-collecting tube, radius is the linear distribution of the circular arc of R, the inner concave arc surface of each Fresnel reflection eyeglass is all towards sunlight incident direction simultaneously, when the direction of sunlight is parallel with the reflecting optics of principal reflection device and the line of centres of thermal-collecting tube, this sheet speculum carries out the upset of 180 °, also include a kind of secondary reflection unit 4, it is arranged on below thermal-collecting tube 1.This secondary reflection unit be a plurality of fresnel reflecting mirror (subreflector) sheet composition, and this plurality of fresnel reflecting mirror be centrally located on same straight line, arc-shaped concave central vertical line point to thermal-collecting tube center, other see summary of the invention part in detail.It is identical with embodiment 1 that the present embodiment does not state part.
It is same as the prior art that the present invention does not state part.
Claims (2)
1. Large Copacity high concentration ratio compound Fresnel line condensing reflection device, include principal reflection device and thermal-collecting tube, it is characterized in that, principal reflection device is made up of for principal reflection mirror a plurality of Fresnel reflection eyeglass constructed with the differential of the arc, the center of each Fresnel reflection eyeglass is provided with transfer, and this plurality of Fresnel reflection eyeglass is positioned at the top of thermal-collecting tube, in a kind of take thermal-collecting tube as the linear distribution of the circular arc in the center of circle, the inner concave arc surface of each Fresnel reflection eyeglass is all towards sunlight incident direction simultaneously, time parallel with the line of centres of thermal-collecting tube with the central point of the Fresnel reflection eyeglass of principal reflection device when the direction of sunlight, this Fresnel reflection eyeglass carries out the upset of 180 °, also include a kind of secondary reflection unit, it is arranged on below thermal-collecting tube, and arc concave surface is towards thermal-collecting tube direction,
Secondary reflection unit is a plurality of Fresnel reflection eyeglass composition, and this plurality of Fresnel reflection eyeglass be centrally located on same straight line, arc concave surface central vertical line points to thermal-collecting tube center;
The angle φ that formed with the two ends, position of secondary reflection unit same widths and thermal-collecting tube central point in the middle of principal reflection device, the spacing between principal reflection mirror is principal reflection mirror width half
doubly, now φ satisfies condition is cos φ/2-
sin φ/4=0;
When the width of the Fresnel reflection eyeglass in secondary reflection unit is enough little and the overall width of secondary reflection unit is x, the usable reflection width of every sheet subreflector is
=
, the Fresnel reflection eyeglass reflection ray in the vertical line that β is thermal-collecting tube and secondary reflection unit and secondary reflection unit is not blocked formed angle,
The transfer of the Fresnel reflection eyeglass in described principal reflection device includes reflector mount, rotating shaft and support, Fresnel reflection eyeglass to be arranged on reflector mount and to form rotor, reflector mount is rotatably supported on support by rotating shaft, rotating shaft core is positioned on the reflection direction of Fresnel reflection eyeglass, and this rotating shaft core is positioned at the thickness of Fresnel reflection eyeglass; Arrange a kind of counterweight, this counterweight is connected with rotor, and is arranged on the extension line of rotor center of gravity and rotating shaft core line.
2. Large Copacity high concentration ratio compound Fresnel line condensing reflection device according to claim 1, is characterized in that, thermal-collecting tube or glass-vacuum tube, or photovoltaic power generation apparatus.
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| CN201210246997.XA CN102721194B (en) | 2012-07-17 | 2012-07-17 | Large-capacity high-concentrating ratio composite Fresnel line concentration reflection device |
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| CN106288440B (en) * | 2016-09-13 | 2019-01-08 | 苏州热工研究院有限公司 | A kind of Salar light-gathering structure |
| CN107919848B (en) * | 2016-10-11 | 2020-01-10 | 华北电力大学 | Annular linear Fresnel high-power condenser |
| CN110375441A (en) * | 2018-04-13 | 2019-10-25 | 兰州大成聚光能源科技有限公司 | Solar energy light gathering and heat collecting system |
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| US2945417A (en) * | 1958-05-12 | 1960-07-19 | Coleman R Caryl | Apparatus and mechanism for concentrating solar rays on objects to be tested |
| US4130109A (en) * | 1977-11-25 | 1978-12-19 | Brueck Chris M | Solar energy concentrator |
| US4192289A (en) * | 1978-06-08 | 1980-03-11 | Clark David J | Solar heat collection system |
| US20030137754A1 (en) * | 2001-12-17 | 2003-07-24 | Vasylyev Sergiy Victorovich | Multistage system for radiant energy flux transformation |
| JP3701264B2 (en) * | 2002-07-05 | 2005-09-28 | 三鷹光器株式会社 | Heliostat for solar condensing system and control method thereof |
| DE502006009427D1 (en) * | 2005-08-20 | 2011-06-16 | Novatec Biosol Ag | Fresnel solar collector arrangement |
| US20090056703A1 (en) * | 2007-08-27 | 2009-03-05 | Ausra, Inc. | Linear fresnel solar arrays and components therefor |
| US20090194097A1 (en) * | 2008-02-03 | 2009-08-06 | Biogensys | Methods and Mechanisms to Increase Efficiencies of Energy or Particle Beam Collectors |
| US20100078011A1 (en) * | 2008-09-25 | 2010-04-01 | Peter Feher | Ultra-compact, linear, solar-thermal steam generator |
| CN202792602U (en) * | 2012-07-17 | 2013-03-13 | 福建省电力有限公司电力科学研究院 | High-capacity combined Fresnel linear-concentration reflector with high concentration ratio |
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