CN104456980A - Secondary concentrated reflection-transmission type parabolic-trough type solar heat collector - Google Patents
Secondary concentrated reflection-transmission type parabolic-trough type solar heat collector Download PDFInfo
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- CN104456980A CN104456980A CN201410747865.4A CN201410747865A CN104456980A CN 104456980 A CN104456980 A CN 104456980A CN 201410747865 A CN201410747865 A CN 201410747865A CN 104456980 A CN104456980 A CN 104456980A
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- parabolic
- fresnel lens
- heat collector
- solar thermal
- parabolic trough
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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
- Y02E10/44—Heat exchange systems
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Abstract
The invention discloses a secondary concentrated reflection-transmission type parabolic-trough type solar heat collector. The collector comprises a line-focusing Fresnel lens, a collimating Fresnel lens, an evacuated heat collector tube and a parabolic trough surface reflector and has a uniaxial ray tracing capability. Real focuses of the line-focusing Fresnel lens and virtual focuses of the collimating Fresnel lens are coincided; the evacuated heat collector tube is located at the focus line position of the parabolic trough surface reflector; parallel sunlight completes primary condensation via the line-focusing Fresnel lens and is diffused into parallel light once again via the collimating Fresnel lens; the parallel sunlight subjected to the primary condensation is reflected to the wall surface of the evacuated heat collector tube through the parabolic trough surface reflector to complete secondary condensation; focused solar energy is absorbed through heat transfer medium in the evacuated heat collector tube to complete the heating process. The solar heat collector can be applied to the solar-thermal field, and difficult problems that heat collecting efficiency of a traditional trough-type heat collector is greatly decreased in periods of winter and the like when sun irradiation is reduced, incident angle is increased are well solved and the cost is low.
Description
Technical field
The present invention relates to solar energy thermal-power-generating technical field, particularly relate to a kind of secondary condensation reflective-transmissive type parabolic trough type solar thermal collector.
Background technology
Solar energy is as inexhaustible, and the new forms of energy of cleanliness without any pollution, be subject to people and pay close attention to more and more widely.Solar light-heat power-generation mainly contains slot type, tower and dish-style three kinds by thermal-arrest form, and wherein trough type solar power generation technology is the most ripe, realizes commercial applications abroad, is the emphasis direction worldwide advancing solar energy thermal-power-generating technical development in the recent period.
In the summer that radiation parameter is good, arrange for north and south axle, the groove type heat collector that thing axle is followed the tracks of, peak value collecting efficiency can reach more than 65%, and daily thermal efficiency fluctuation is little, and tank-type thermal power generation system table reveals good thermal performance.But, along with winter solar irradiation intensity declines, solar incident angle increases, the collecting efficiency of groove type heat collector obviously declines, solar energy heating efficiency in typical case's day winter is only about 30%, and under collecting efficiency, general who has surrendered brings the load down of solar heat power generation system steam turbine to run, and causes the average annual generating efficiency of tank-type thermal power generation system to be difficult to improve, or set up energy storage device in order to steam turbine maintains stable operation, bring cost of investment and cost of electricity-generating to improve further.
Above-mentioned solar collecting performance declines and causes Technical Economy to be difficult to the problem improved, and is the key issue that current tank-type thermal power generation technology runs into, directly constrains its large-scale commercial and apply.Therefore, improving the solar collecting performance of groove type heat collector when solar irradiation declines and incidence angle increases, is this field important technological problems urgently to be resolved hurrily.
Summary of the invention
(1) technical problem that will solve
In view of this, main purpose of the present invention is to provide a kind of secondary condensation transmission-reflecting parabolic trough type solar thermal collector, by arranging linear Fresnel lens, collimation Fresnel Lenses, realize an optically focused to solar energy, the secondary condensation to solar energy is realized again by parabolic groove face speculum, thus under solving the condition of work of current solar irradiation decline, the technical barrier that groove type heat collector solar collecting performance declines.
(2) technical scheme
For achieving the above object, the invention provides a kind of secondary condensation reflective-transmissive type parabolic trough type solar thermal collector, this parabolic trough type solar thermal collector comprises utilizing line-focus Fresnel lens 1, collimation Fresnel Lenses 2, vacuum heat collection pipe 3 and parabolic groove face speculum 4, sunshine exposes to parabolic groove face speculum 4 through utilizing line-focus Fresnel lens 1 and collimation Fresnel Lenses 2 successively, polished object groove face speculum 4 reflecting focal to the wall of vacuum heat collection pipe 3, and then improves the collecting efficiency of groove type heat collector.
In such scheme, the real focus of described utilizing line-focus Fresnel lens 1 overlaps with the virtual focus of collimation Fresnel Lenses 2.
In such scheme, described sunshine completes an optically focused through utilizing line-focus Fresnel lens 1, and exposes to collimation Fresnel Lenses 2.
In such scheme, described in complete an optically focused sunshine be again diffused as directional light through collimation Fresnel Lenses 2.
In such scheme, described parabolic groove face speculum 4 is by an optically focused and be again diffused as the sunshine reflecting focal of directional light to the wall of vacuum heat collection pipe 3, completes secondary condensation.
In such scheme, described vacuum heat collection pipe 3 is positioned at the focal line position of parabolic groove face speculum 4, and after ensureing that sunshine polished object groove face speculum 4 focuses on, focal beam spot accurately drops on vacuum heat collection pipe 3, vacuum heat collection pipe 3 internal heat transfer Absorption of Medium focused solar energy, completes temperature-rise period.
In such scheme, this parabolic trough type solar thermal collector has single shaft ray tracing ability.
(3) beneficial effect
As can be seen from technique scheme, the present invention has following beneficial effect:
1, utilize the present invention, by Fresnel Lenses and parabolic groove face speculum, the secondary condensation to solar irradiation can be realized, thus increase the solar energy energy-flux density of vacuum heat collection pipe acceptance, significantly improve the collecting efficiency of groove type heat collector.
2, utilize the present invention, Fresnel Lenses is many thin slices being noted pressure by polyolefine material, and shank is frivolous.With Fresnel Lenses as secondary light condensing device, relative increase tradition groove type heat collector aperture area is to collect the mode of more solar irradiations, the requirement of strength of solar thermal collector to supporting construction can be reduced, save the steel consumption of support, thus cost-saving, improve the economy of trough type solar power generation.
3, utilize the present invention, Fresnel Lenses has easy making process, can be mass, and the advantages such as low price are widely used already in modern industry.With Fresnel Lenses as secondary light condensing device, self cost of high concentration ratio solar thermal collector can be reduced, improve the economy of trough type solar power generation.
4, utilize the present invention, according to actual thermal-arrest changes in demand, again structural design can be carried out to linear Fresnel lens and collimation Fresnel Lenses, thus adjust the focusing ratio of heat collector by the mode only changing Fresnel Lenses, be easy to transform heat collector.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of traditional parabolic trough type solar thermal collector;
Wherein Reference numeral is: 1-vacuum heat collection pipe; 2-parabolic groove face speculum.
Fig. 2 is the schematic diagram of the secondary condensation transmission-reflecting parabolic trough type solar thermal collector according to the embodiment of the present invention;
Wherein Reference numeral is: 1-utilizing line-focus Fresnel lens; 2-collimates Fresnel Lenses; 3-vacuum heat collection pipe; 4-parabolic groove face speculum.
Detailed description of the invention
For making the object, technical solutions and advantages of the present invention clearly understand, below in conjunction with specific embodiment, and with reference to accompanying drawing, the present invention is described in more detail.
As shown in Figure 2, transmission-reflecting parabolic trough type solar thermal collector provided by the invention, comprise utilizing line-focus Fresnel lens 1, collimation Fresnel Lenses 2, vacuum heat collection pipe 3 and parabolic groove face speculum 4, sunshine exposes to parabolic groove face speculum 4 through utilizing line-focus Fresnel lens 1 and collimation Fresnel Lenses 2 successively, polished object groove face speculum 4 reflecting focal to the wall of vacuum heat collection pipe 3, and then improves the collecting efficiency of groove type heat collector.
The real focus of utilizing line-focus Fresnel lens 1 overlaps with the virtual focus of collimation Fresnel Lenses 2.Parallel sunshine is carried out an optically focused by utilizing line-focus Fresnel lens 1, and exposes to collimation Fresnel Lenses 2; Sunshine after an optically focused is diffused as parallel sunshine by collimation Fresnel Lenses 2 again, and exposes to parabolic groove face speculum 4; This parallel sunshine reflecting focal after experience optically focused to the wall of vacuum heat collection pipe 3, is realized secondary condensation by parabolic groove face speculum 4.Vacuum heat collection pipe 3 is positioned at the focal line position of parabolic groove face speculum 4, after ensureing that approximately parallel sunray is focused, focal beam spot can accurately drop on vacuum heat collection pipe 3, and the heat transfer medium of vacuum heat collection pipe 3 inside absorbs focused solar energy, completes temperature-rise period.
In traditional groove type heat collector, as shown in Figure 1, parabolic trough type speculum can only receive sunshine in opening surface, in the period waiting irradiation intensity to decline in the winter time, the solar energy metric density received in aperture area declines, and mirror field solar collecting performance declines obviously, causes average annual efficiency to reduce.
In the present invention, as shown in Figure 2, by arranging linear Fresnel lens and collimation Fresnel Lenses in parabolic groove face speculum opening surface direction, more sunshines can be converged on parabolic groove face speculum, thus after solving the solar irradiation declines such as winter and solar incident angle increase, the effective incident solar irradiation received due to heat collector declines, and the problem causing collecting efficiency to decline, and effectively improves the solar collecting performance of Jing Chang under low irradiation.
Secondary condensation reflective-transmissive type parabolic trough type solar thermal collector provided by the invention, there is single shaft ray tracing ability, heat can be added according to actual needs or actual needs reaches temperature, determine the focusing ratio of solar thermal collector, thus determine tooth angle, the tooth pitch of utilizing line-focus Fresnel lens and collimation Fresnel Lenses, the structural parameters such as opening shape, A/F of parabolic mirror.
Arrange for north and south trunnion axis and it is carried out to the design improvement of secondary condensation by the groove type heat collector LS3 that thing is followed the tracks of, suppose that heat collector is arranged on the abundant Shizuishan area of China's solar energy resources, its year, effectively accumulative irradiation (was greater than 300W/m
2) can 1988kWh/m be reached
2.Wherein, effective incident irradiance at high noon summer solstice is: DNI × cos θ=1022W/m
2× 0.96=981W/m
2; But in the winter solstice, high noon, effective incident irradiance dropped to: DNI × cos θ=900W/m
2× 0.46=414W/m
2.Wherein, cos θ is the cosine of solar incident angle.As can be seen here, even if in the class area that solar energy resources is so abundant, effective irradiation was compared and also at least be have dropped half summer winter at high noon, namely constant in tracking mode, under heat collector area one stable condition, the energy density that winter, minute surface received have dropped about half.
In order to improve energy density in winter, can consider, in the winter time for groove type heat collector installs linear Fresnel lens and collimation Fresnel Lenses additional, to carry out secondary condensation.The energy density that winter solstice parabola groove opening surface receives sunshine reduces about half, and as made it again be promoted to summer solstice level, collecting of set of lenses is set as f than (i.e. utilizing line-focus Fresnel lens focal length and the ratio collimating Fresnel Lenses focal length)
2/ f
1=2.Be 5.77m for opening, parabolic groove face reflecting mirror focal length is the LS3 groove type heat collector of 1.71m, can be calculated, utilizing line-focus Fresnel lens focal distance f
2be about 6m, two lenticular spacings are about 3m.According to estimates, after secondary condensation transformation, the average annual collecting efficiency of solar energy heat-collection field will be promoted to 60% ~ 65% by existing average annual 45% ~ 50%.
Above-described specific embodiment; object of the present invention, technical scheme and beneficial effect are further described; be understood that; the foregoing is only specific embodiments of the invention; be not limited to the present invention; within the spirit and principles in the present invention all, any amendment made, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (7)
1. a secondary condensation reflective-transmissive type parabolic trough type solar thermal collector, it is characterized in that, this parabolic trough type solar thermal collector comprises utilizing line-focus Fresnel lens (1), collimation Fresnel Lenses (2), vacuum heat collection pipe (3) and parabolic groove face speculum (4), sunshine exposes to parabolic groove face speculum (4) through utilizing line-focus Fresnel lens (1) and collimation Fresnel Lenses (2) successively, polished object groove face speculum (4) reflecting focal is to the wall of vacuum heat collection pipe (3), and then improve the collecting efficiency of groove type heat collector.
2. secondary condensation reflective-transmissive type parabolic trough type solar thermal collector according to claim 1, is characterized in that, the real focus of described utilizing line-focus Fresnel lens (1) overlaps with the virtual focus of collimation Fresnel Lenses (2).
3. secondary condensation reflective-transmissive type parabolic trough type solar thermal collector according to claim 1, it is characterized in that, described sunshine completes an optically focused through utilizing line-focus Fresnel lens (1), and exposes to collimation Fresnel Lenses (2).
4. secondary condensation reflective-transmissive type parabolic trough type solar thermal collector according to claim 3, is characterized in that, described in complete an optically focused sunshine be again diffused as directional light through collimation Fresnel Lenses (2).
5. secondary condensation reflective-transmissive type parabolic trough type solar thermal collector according to claim 4, it is characterized in that, described parabolic groove face speculum (4) is by an optically focused and be again diffused as the sunshine reflecting focal of directional light to the wall of vacuum heat collection pipe (3), completes secondary condensation.
6. secondary condensation reflective-transmissive type parabolic trough type solar thermal collector according to claim 1, it is characterized in that, described vacuum heat collection pipe (3) is positioned at the focal line position of parabolic groove face speculum (4), after ensureing that sunshine polished object groove face speculum (4) focuses on, focal beam spot accurately drops on vacuum heat collection pipe (3), vacuum heat collection pipe (3) internal heat transfer Absorption of Medium focused solar energy, completes temperature-rise period.
7. secondary condensation reflective-transmissive type parabolic trough type solar thermal collector according to claim 1, it is characterized in that, this parabolic trough type solar thermal collector has single shaft ray tracing ability.
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106374815A (en) * | 2016-09-20 | 2017-02-01 | 中国科学院工程热物理研究所 | Nano-catalyst-based solar photovoltaic-thermochemical composite apparatus and power generation system |
| TWI578024B (en) * | 2015-11-30 | 2017-04-11 | 財團法人金屬工業研究發展中心 | Light collecting module |
| TWI583124B (en) * | 2016-10-03 | 2017-05-11 | 財團法人金屬工業研究發展中心 | Light collecting module |
| CN106839456A (en) * | 2017-04-01 | 2017-06-13 | 内蒙古工业大学 | Compound many curved surface groove type solar concentrating collectors with automatic defrosting system |
| CN107162096A (en) * | 2017-04-10 | 2017-09-15 | 合肥工业大学 | A kind of solar energy type water supply network ultraviolet sterilizer |
| CN107166754A (en) * | 2017-05-09 | 2017-09-15 | 龚治俊 | Solar focusing heat collection mechanism |
| 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 |
| CN110513895A (en) * | 2019-09-24 | 2019-11-29 | 华北理工大学 | A kind of solar energy heat-collection generating device based on triangular prism characteristic |
| CN111473291A (en) * | 2020-06-01 | 2020-07-31 | 夏啟忠 | Full-effective-period sunlight guide-in mechanism |
| JP2020525833A (en) * | 2017-07-03 | 2020-08-27 | ボリーメディア ホールディングス カンパニー リミテッドＢｏｌｙｍｅｄｉａ Ｈｏｌｄｉｎｇｓ Ｃｏ． Ｌｔｄ． | Fresnel concentrator and concentrating solar energy system |
| CN112361617A (en) * | 2020-11-30 | 2021-02-12 | 胡永海 | Light-gathering solar vacuum tube |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| TWI578024B (en) * | 2015-11-30 | 2017-04-11 | 財團法人金屬工業研究發展中心 | Light collecting module |
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| CN106839456A (en) * | 2017-04-01 | 2017-06-13 | 内蒙古工业大学 | Compound many curved surface groove type solar concentrating collectors with automatic defrosting system |
| CN106839456B (en) * | 2017-04-01 | 2023-04-28 | 内蒙古天之风科技有限责任公司 | Composite multi-curved-surface groove type solar concentrating collector with automatic defrosting function |
| CN107162096A (en) * | 2017-04-10 | 2017-09-15 | 合肥工业大学 | A kind of solar energy type water supply network ultraviolet sterilizer |
| CN107162096B (en) * | 2017-04-10 | 2020-12-08 | 合肥工业大学 | Solar energy type water supply pipe network ultraviolet sterilization device |
| CN107166754A (en) * | 2017-05-09 | 2017-09-15 | 龚治俊 | Solar focusing heat collection mechanism |
| JP2020525833A (en) * | 2017-07-03 | 2020-08-27 | ボリーメディア ホールディングス カンパニー リミテッドＢｏｌｙｍｅｄｉａ Ｈｏｌｄｉｎｇｓ Ｃｏ． Ｌｔｄ． | Fresnel concentrator and concentrating solar energy system |
| 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 |
| CN110513895A (en) * | 2019-09-24 | 2019-11-29 | 华北理工大学 | A kind of solar energy heat-collection generating device based on triangular prism characteristic |
| CN111473291A (en) * | 2020-06-01 | 2020-07-31 | 夏啟忠 | Full-effective-period sunlight guide-in mechanism |
| CN112361617A (en) * | 2020-11-30 | 2021-02-12 | 胡永海 | Light-gathering solar vacuum tube |
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