CN104048429B - A kind of for high temperature cavity type thermal-collecting tube in slot type collecting system - Google Patents
A kind of for high temperature cavity type thermal-collecting tube in slot type collecting system Download PDFInfo
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- CN104048429B CN104048429B CN201410305338.8A CN201410305338A CN104048429B CN 104048429 B CN104048429 B CN 104048429B CN 201410305338 A CN201410305338 A CN 201410305338A CN 104048429 B CN104048429 B CN 104048429B
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- Prior art keywords
- circular glass
- cavity
- high temperature
- reflectors
- glass cavity
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- 239000011521 glass Substances 0.000 claims abstract description 61
- 238000010521 absorption reaction Methods 0.000 claims abstract description 47
- 229910052751 metal Inorganic materials 0.000 claims abstract description 43
- 239000002184 metal Substances 0.000 claims abstract description 43
- 239000011248 coating agent Substances 0.000 claims abstract description 27
- 238000000576 coating method Methods 0.000 claims abstract description 27
- 238000009413 insulation Methods 0.000 claims abstract description 8
- 239000012528 membrane Substances 0.000 claims description 3
- 230000003760 hair shine Effects 0.000 abstract description 2
- 238000012423 maintenance Methods 0.000 abstract description 2
- 238000007747 plating Methods 0.000 abstract 2
- 241000127225 Enceliopsis nudicaulis Species 0.000 abstract 1
- 239000010410 layer Substances 0.000 description 6
- 238000004519 manufacturing process Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 230000007774 longterm Effects 0.000 description 3
- 241001424688 Enceliopsis Species 0.000 description 2
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 1
- 239000006096 absorbing agent Substances 0.000 description 1
- 229910052804 chromium Inorganic materials 0.000 description 1
- 239000011651 chromium Substances 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000011229 interlayer Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 238000005057 refrigeration Methods 0.000 description 1
Classifications
-
- 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
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- Optical Elements Other Than Lenses (AREA)
Abstract
The invention discloses a kind of for high temperature cavity type thermal-collecting tube in slot type collecting system, comprise circular glass cavity, triangle reflecting plate and Metal absorption pipe, wherein circular glass chamber outer surface scribbles heat-insulation layer, certain gap is left as light mouth between set square, the inner surface plating of circular glass cavity is with reflectance coating, and the plating of absorption tube outer surface is with coating for selective absorption.Sunray is reflected by parabolic reflector, part light is directly mapped in circular glass cavity, other light enters in cavity through triangle baffle reflection, the light part injected inside cavity shines directly on absorption tube, and another part is absorbed by absorption tube through the reflection of circular glass cavity again.Instant invention overcomes the rigors of traditional vacuum tube to vacuum, have Heat-collecting effect good, structure is simple, the advantages such as lower are required to tracking system, and cost is lower than high-temperature vacuum heat-collecting tube in tradition, easy to maintenance, life-span is longer, has good market development prospect.
Description
Technical field
The present invention relates to a kind of solar energy heat collection pipe, the middle high temperature cavity type thermal-collecting tube specifically in a kind of slot type collecting system.
Background technology
Slot type focused solar energy thermal-collecting tube, as the one of middle high-temperature heat-collection pipe, can obtain higher heat-collecting temperature, can be used for production and the sphere of lifes such as generating, refrigeration air-conditioner, heating, desalinization.At present, although what tradition slot type solar energy heat collection pipe mainly adopted is that metal-glass structure high vacuum interlayer greatly reduces heat loss, but the problem that the sealing-in that simultaneously there is metal and glass is leaked gas after going out long-term work, and adopt the cavity absorber based on the principle of black chamber effectively can avoid the problems referred to above, improve the reliability of system cloud gray model, reduce difficulty and the cost of research and production.Wherein absorption tube is a metal tube, and its surface scribbles selective coating, is used for absorbing solar energy, the material of selective coating is mainly black chromium, black nickel etc., in order to reduce heat loss, in the outer surface cover concentric glass round tube of metal circular tube, vacuumize in the middle of metal tube and glass tube.Its major advantage is: absorption tube is with extraneous without convection losses, and selective coating, very high to the absorptivity of sunlight, emissivity is at the working temperature very low.Its shortcoming is: complex process, cost is high, the stability of long-term vacuum enhancing and selective coating can not be kept, under the working condition of long term high temperature, because the glass-to-metal seal coefficient of expansion is different, the situation that metal and glass sealing place can be caused to leak air, is difficult to keep vacuum, reduces the whole operating efficiency of groove type solar system and the stability of system.
Summary of the invention
The present invention, in order to solve the problem, proposes the middle high temperature cavity type thermal-collecting tube in a kind of slot type collecting system.
The technical solution adopted in the present invention is as follows:
For a high temperature cavity type thermal-collecting tube in slot type collecting system, comprise two reflectors, circular glass cavity and Metal absorption pipe, described Metal absorption pipe is positioned at circular glass cavity; Described two reflectors are placed in the outer surface of circular glass cavity, leave light mouth between the contact position of the outer surface of described two reflectors and circular glass cavity; Described two reflectors are arranged symmetrically with light mouth, and its extended line intersection forms certain angle; The intersection point of the extended line of described two reflectors, the center of circle in circular glass chamber, the center of circle of Metal absorption pipe and the focus of optically focused parabolic lens are point-blank; Described circular glass chamber outer surface, is coated with one deck reflectance coating beyond light mouth, the heat-insulation layer of described reflectance coating outer wrapping one deck.
Aforesaid reflectance coating is silver-colored reflectance coating.
The thickness of aforesaid heat-insulation layer is 10mm.
The beeline in the outer wall distance circular glass cavity inner wall face of aforesaid Metal absorption pipe is 2 ~ 3mm.
Aforesaid Metal absorption pipe is built with heat absorption working medium, and described Metal absorption tube outer surface is coated with selective coating.
The inner surface of aforesaid two reflectors is coated with reflective membrane.
The A/F of aforesaid light mouth is determined in the following manner:
The equation of parabolic concentration mirror is: y
2=4fx,
The equation of circular glass cavity is: (x-f-D)
2+ y
2=R
2,
The equation of Metal absorption pipe is: (x-f-D-R+r+l)
2+ y
2=r
2,
The equation of upper side reflector is:
lower side reflector and upper side reflector equation are symmetrical about x-axis,
Wherein, x, y is reference axis, R is the internal diameter of circular glass cavity, r is the external diameter of Metal absorption pipe, and f is the focal length of parabolic concentration mirror, and D is the distance between the focus of parabolic concentration mirror and the center of circle of circular glass cavity, l is the beeline between the outer wall of Metal absorption pipe and circular glass cavity inner wall, and α is the angle between reflector and x-axis;
The A/F of described light mouth is the width between the intersection point of the equation of two triangle reflection plates and the equation of circular glass cavity.
Angle between aforesaid two reflectors is greater than the angle that optically focused parabolic lens edge reflections light is formed.
When optically focused parabolic lens focal length is 800mm, optically focused parabolic lens A/F is 1m, and when tracking accuracy is 0.2 ゜, the angle between described two reflectors is 80 ゜ ~ 100 ゜.
The invention has the advantages that:
(1) overcome the rigors of traditional vacuum tube for vacuum, structure is simple, substantially reduces manufacturing cost;
(2) problem of metal sealing need not be considered, substantially increase the stability of system;
(3) utilize the feature of blackbody chamber high-absorbility, absorptivity is high, and inside cavity Metal absorption pipe not necessarily will smear selective coating, reduces technological requirement;
(4) die sinking of circular glass chamber is simple, only needs the size controlling heat-insulation layer just can control the A/F of cavity, easy for installation, easy to maintenance, is conducive to mass production;
(5) by the principle of reflection of triangle reflection plate, the A/F of cavity can be reduced, further increase the absorption efficiency of cavity.
Accompanying drawing explanation
Fig. 1 is groove type solar cavity type thermal-collecting tube sectional view of the present invention;
Fig. 2 is based on groove type solar cavity type thermal-collecting tube ray trace schematic diagram under Tracepro;
Fig. 3 is ray trace schematic diagram when being 0.2 ゜ based on tracking error under Tracepro;
Fig. 4 is each several part of the present invention position relationship schematic diagram spatially.
Detailed description of the invention
Below in conjunction with the drawings and specific embodiments, the present invention is described in further detail.
Of the present invention for high temperature cavity type thermal-collecting tube in slot type collecting system, section as shown in Figure 1, comprises Metal absorption pipe 1, circular glass cavity 2, reflectance coating 3, heat-insulation layer 4 and two reflectors 5.
Metal absorption pipe 1 is positioned at circular glass cavity 2, and the position of Metal absorption pipe 1 does not contact near the internal face of circular glass cavity 2 as far as possible, is used for receiving the light reflected into from reflector 5 in circular glass cavity 2.The beeline of getting outer wall distance circular glass cavity 2 internal face of Metal absorption pipe 1 in the present invention is 2 ~ 3mm.
Two reflectors 5 are placed in the outer surface of circular glass cavity 2, and leave gap between the contact position of the outer surface of two reflectors 5 and circular glass cavity 2, as light mouth, two reflectors 5 are arranged symmetrically with light mouth, when meeting the reception light can trying one's best many, light mouth is little as far as possible, the extended line intersection shape of two reflectors 5 has a certain degree, and the intersection point of the extended line of two reflectors 5, the center of circle of circular glass cavity 2, the center of circle of Metal absorption pipe 1 and the focus of optically focused parabolic lens 6 are point-blank.Optically focused parabolic lens refers to and parallel sunshine is gathered a certain hot spot.
The A/F of light mouth is determined in the following manner, as shown in Figure 4,
The equation of parabolic concentration mirror is: y
2=4fx,
The equation of circular glass cavity is: (x-f-D)
2+ y
2=R
2,
The equation of Metal absorption pipe is: (x-f-D-R+r+l)
2+ y
2=r
2,
The equation of upper side reflector is:
lower side reflector and upper side reflector equation are symmetrical about x-axis,
Wherein, x, y is reference axis, R is the internal diameter of circular glass cavity, r is the external diameter of Metal absorption pipe, and f is the focal length of parabolic concentration mirror, and D is the distance between the focus of parabolic concentration mirror and the center of circle of circular glass cavity, l is the beeline between the outer wall of Metal absorption pipe and circular glass cavity inner wall, and α is the angle between reflector and x-axis;
Generally, get R ≈ 3r,
The A/F of light mouth is the width between the intersection point of the equation of two triangle reflection plates and the equation of circular glass cavity.After angle α between reflector and x-axis determines, the placement location of two reflectors can be determined.
Get the angle that angle 2 α between two reflectors 5 is formed slightly larger than optically focused parabolic lens 6 edge reflections light in the present invention, the light after optically focused parabolic lens can be entered between two reflectors and enter into again in circular glass cavity 2.Such as, when optically focused parabolic lens focal length is 800mm, A/F is 1m, and when tracking accuracy is 0.2 ゜, angle 2 α between two reflectors can be set to 80 ゜ ~ 100 ゜.
At circular glass cavity 2 outer surface, except light mouth, plate the reflectance coating 3 with high reflectance, then be about the heat-insulation layer 4 of 10mm in reflectance coating 3 outer wrapping a layer thickness.In the present invention, reflectance coating adopts silver-colored reflectance coating.
Principle of the present invention is, sunray enters circular glass cavity 2 from light mouth after being assembled by optically focused parabolic lens 6, part light is directly mapped to Metal absorption pipe 1, other the light reflectance coating 3 through circular glass cavity 2 surface once or multiple reflections absorbed by the selective coating of Metal absorption pipe 1 outside wall surface again.
Metal absorption pipe 1 of the present invention is built with heat absorption working medium, and outer surface is coated with selective coating, increases the absorptivity of Metal absorption pipe 1.
Due to the existence of tracking error, situation about defocusing is there will be at the focus place of optically focused parabolic lens 6, thus cause light to be not assemble with the situation of focal line, can the light of dispersion all be reflexed to inside circular glass cavity 2 by reflector 5, the present invention plates at the inner surface of reflector 5 with the reflective membrane of high reflectance, increases light reflectance further.
As shown in Figure 2, when there is not tracking error, sunray is through the gathering of optically focused parabolic lens 6, part light shines directly into circular glass cavity 2 li, a part enters inside circular glass cavity 2 by the reflection of reflector 5, the light part entering circular glass cavity 2 inside directly absorb by Metal absorption pipe 1, absorbed by Metal absorption pipe 1 after the reflectance coating one or many reflection of another part through circular glass cavity 2 surface.
As shown in Figure 3, when there is tracking error, light offsets, light reflection can be entered inside circular glass cavity 2 by reflector 5, part light is directly absorbed by Metal absorption pipe 1, is absorbed after the reflectance coating one or many reflection of another part through circular glass cavity 2 surface by Metal absorption pipe 1.
Adopt reflector 5, the A/F turning circular glass cavity 2 down that not only can be suitable, when there is unavoidable error, substantially increases the absorption efficiency of circular glass cavity 2.
Claims (8)
1., for a high temperature cavity type thermal-collecting tube in slot type collecting system, it is characterized in that, comprise two reflectors, circular glass cavity and Metal absorption pipe, described Metal absorption pipe is positioned at circular glass cavity; Described two reflectors are placed in the outer surface of circular glass cavity, leave light mouth between the contact position of the outer surface of described two reflectors and circular glass cavity; Described two reflectors are arranged symmetrically with light mouth, and its extended line intersection forms certain angle; The intersection point of the extended line of described two reflectors, the center of circle of circular glass cavity, the center of circle of Metal absorption pipe and the focus of optically focused parabolic lens are point-blank; Described circular glass chamber outer surface, is coated with one deck reflectance coating beyond light mouth, the heat-insulation layer of described reflectance coating outer wrapping one deck;
The A/F of described light mouth is determined in the following manner:
The equation of optically focused parabolic lens is: y
2=4fx,
The equation of circular glass cavity is: (x-f-D)
2+ y
2=R
2,
The equation of Metal absorption pipe is: (x-f-D-R+r+l)
2+ y
2=r
2,
The equation of upper side reflector is:
lower side reflector and upper side reflector equation are symmetrical about x-axis,
Wherein, x, y is reference axis, R is the internal diameter of circular glass cavity, r is the external diameter of Metal absorption pipe, and f is the focal length of optically focused parabolic lens, and D is the distance between the focus of optically focused parabolic lens and the center of circle of circular glass cavity, l is the beeline between the outer wall of Metal absorption pipe and circular glass cavity inner wall, and α is the angle between reflector and x-axis;
The A/F of light mouth is the width between the intersection point of the equation of two triangle reflection plates and the equation of circular glass cavity.
2. a kind of for high temperature cavity type thermal-collecting tube in slot type collecting system according to claim 1, it is characterized in that: described reflectance coating is silver-colored reflectance coating.
3. a kind of for high temperature cavity type thermal-collecting tube in slot type collecting system according to claim 1, it is characterized in that: the thickness of described heat-insulation layer is 10mm.
4. a kind of for high temperature cavity type thermal-collecting tube in slot type collecting system according to claim 1, it is characterized in that: the beeline in the outer wall distance circular glass cavity inner wall face of described Metal absorption pipe is 2 ~ 3mm.
5. a kind of for high temperature cavity type thermal-collecting tube in slot type collecting system according to claim 1, it is characterized in that: described Metal absorption pipe is built with heat absorption working medium, and described Metal absorption tube outer surface is coated with selective coating.
6. a kind of for high temperature cavity type thermal-collecting tube in slot type collecting system according to claim 1, it is characterized in that: the inner surface of described two reflectors is coated with reflective membrane.
7. a kind of for high temperature cavity type thermal-collecting tube in slot type collecting system according to claim 1, it is characterized in that: the angle between described two reflectors is greater than the angle that optically focused parabolic lens edge reflections light is formed.
8. a kind of for high temperature cavity type thermal-collecting tube in slot type collecting system according to claim 7, it is characterized in that: when optically focused parabolic lens focal length is 800mm, optically focused parabolic lens A/F is 1m, and when tracking accuracy is 0.2 ゜, the angle between described two reflectors is 80 ゜ ~ 100 ゜.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410305338.8A CN104048429B (en) | 2014-06-27 | 2014-06-27 | A kind of for high temperature cavity type thermal-collecting tube in slot type collecting system |
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|---|---|---|---|
| CN201410305338.8A CN104048429B (en) | 2014-06-27 | 2014-06-27 | A kind of for high temperature cavity type thermal-collecting tube in slot type collecting system |
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| CN104048429B true CN104048429B (en) | 2015-11-18 |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104390379A (en) * | 2014-11-26 | 2015-03-04 | 中海阳能源集团股份有限公司 | Cavity type heat collecting pipe for solar heat collection |
| CN106766257A (en) * | 2016-12-30 | 2017-05-31 | 东南大学 | A kind of trough type solar heat-collector |
| CN106766282B (en) * | 2017-01-23 | 2018-12-25 | 河海大学常州校区 | A kind of elliptical cavity formula thermal-collecting tube outer heat insulation layer forming method |
| CN111473526B (en) * | 2020-04-14 | 2021-08-31 | 骊阳(广东)节能科技股份有限公司 | Parabolic trough type solar heat collector |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4091796A (en) * | 1976-08-16 | 1978-05-30 | Owens-Illinois, Inc. | Solar energy collection apparatus |
| CN101655286A (en) * | 2008-08-20 | 2010-02-24 | 刘玉山 | Cavity-type solar collector |
| CN201885428U (en) * | 2010-09-30 | 2011-06-29 | 北京印刷学院 | Solar-energy water heater collecting and concentrating light through hemispherical surface of closed cavity |
| CN102455068A (en) * | 2010-10-25 | 2012-05-16 | 北京印刷学院 | Solar hot-water power generation assembly with parabolic cylinder light concentration and lighting |
| CN103225900A (en) * | 2013-04-25 | 2013-07-31 | 桑夏太阳能股份有限公司 | Pressure-bearing type solar collector based on groove-type parabolic mirror |
| CN204329362U (en) * | 2014-06-27 | 2015-05-13 | 南通河海大学海洋与近海工程研究院 | A kind of for high temperature cavity type thermal-collecting tube in slot type collecting system |
-
2014
- 2014-06-27 CN CN201410305338.8A patent/CN104048429B/en not_active Expired - Fee Related
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4091796A (en) * | 1976-08-16 | 1978-05-30 | Owens-Illinois, Inc. | Solar energy collection apparatus |
| CN101655286A (en) * | 2008-08-20 | 2010-02-24 | 刘玉山 | Cavity-type solar collector |
| CN201885428U (en) * | 2010-09-30 | 2011-06-29 | 北京印刷学院 | Solar-energy water heater collecting and concentrating light through hemispherical surface of closed cavity |
| CN102455068A (en) * | 2010-10-25 | 2012-05-16 | 北京印刷学院 | Solar hot-water power generation assembly with parabolic cylinder light concentration and lighting |
| CN103225900A (en) * | 2013-04-25 | 2013-07-31 | 桑夏太阳能股份有限公司 | Pressure-bearing type solar collector based on groove-type parabolic mirror |
| CN204329362U (en) * | 2014-06-27 | 2015-05-13 | 南通河海大学海洋与近海工程研究院 | A kind of for high temperature cavity type thermal-collecting tube in slot type collecting system |
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