CN106766258A - A kind of high-temperature vacuum heat-collecting tube with transparent insulation board - Google Patents
A kind of high-temperature vacuum heat-collecting tube with transparent insulation board Download PDFInfo
- Publication number
- CN106766258A CN106766258A CN201611107803.2A CN201611107803A CN106766258A CN 106766258 A CN106766258 A CN 106766258A CN 201611107803 A CN201611107803 A CN 201611107803A CN 106766258 A CN106766258 A CN 106766258A
- Authority
- CN
- China
- Prior art keywords
- insulation board
- transparent insulation
- vacuum heat
- inner tube
- tube
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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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
- F24S10/00—Solar heat collectors using working fluids
- F24S10/70—Solar heat collectors using working fluids the working fluids being conveyed through tubular absorbing conduits
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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
- F24S23/74—Arrangements for concentrating solar-rays for solar heat collectors with reflectors with trough-shaped or cylindro-parabolic reflective surfaces
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24S—SOLAR HEAT COLLECTORS; SOLAR HEAT SYSTEMS
- F24S70/00—Details of absorbing elements
- F24S70/20—Details of absorbing elements characterised by absorbing coatings; characterised by surface treatment for increasing absorption
- F24S70/25—Coatings made of metallic material
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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
Abstract
The present invention relates to a kind of high-temperature vacuum heat-collecting tube with transparent insulation board.Including slot-type optical collector, outer tube and inner tube, the outer tube and inner tube are the pipe being coaxially disposed；Insulation board is provided between the outer tube and inner tube, side of the inner tube top without optically focused hot spot is covered, transparent insulation board has to solar radiation wave band high transmission, the characteristic of centering far infrared radiation wave band high reflection.The present invention ensure insulation board to vacuum heat collection pipe receive sun direct projection energy interference it is small while, effectively reduce the external radiation heat loss of inner tube, be a kind of process is simple, reliability is high, can effectively reduce heat waste the transparent insulation board of band high-temperature vacuum heat-collecting tube.
Description
Technical field
The invention belongs to solar energy heat utilization technical field, it is related to solar groove type focussing heat-collecting device, and in particular to
A kind of high-temperature vacuum heat-collecting tube with transparent insulation board.
Background technology
Trough solar power generation is current application most wide, the solar energy thermal-power-generating technology of technology maturation, usual light and heat collection
Temperature is at 400 DEG C or so.Be evacuated between vacuum heat collection pipe outer tube and inner tube, greatly inhibit convection current between the two and
Heat conduction, therefore vacuum heat collection pipe inner tube mainly externally radiates in radiation heat transfer mode.According to Stefan-Boltzmann law, thing
The external radiations heat energy of body is related to 4 powers of its temperature, and the coating for selective absorption in outer wall of inner tube face emissivity with inner tube
The rising of temperature and increase, when inner tube temperature be 400 DEG C when its coatings emissivity up to 0.1, so with high-temperature vacuum thermal-arrest
The rising of pipe heat-collecting temperature, its external radiation heat loss can be increased dramatically；Simultaneously with the rising of heat-collecting temperature, inner tube is to external spectrum
The corresponding wavelength of radiation peak is tapered into and close to solar radiation wave band, and outer tube has high transmittance to solar radiation wave band,
This enables to have the radiations heat energy of quite a few wave band through outer tube, causes inner tube to pass through outer tube directly and atmospheric environment
Radiation loss increase.So high-temperature vacuum heat-collecting tube is under heat-collecting temperature higher, external radiation heat loss is very big, has a strong impact on
Thermal-collecting tube collecting efficiency, therefore the radiation heat loss of reduction high-temperature vacuum heat-collecting tube has great significance.
The content of the invention
In order to realize being reduced in the case where radiation heat loss's accounting is high the radiation heat loss of vacuum heat collection pipe, solar energy is improved
Utilization ratio, the present invention provides a kind of high-temperature vacuum heat-collecting tube with transparent insulation board.
A kind of high-temperature vacuum heat-collecting tube with transparent insulation board includes slot-type optical collector 1, outer tube 2 and inner tube 3, the outer tube
2 and inner tube 3 be the pipe that is coaxially disposed；
Transparent insulation board 4, side of the covering inner tube 3 without optically focused hot spot, transparent insulation board 4 are provided between the outer tube 2 and inner tube 3
With to solar radiation wave band high transmission, the characteristic of centering far infrared radiation wave band high reflection.
The technical scheme for further limiting is as follows：
The cross section of the transparent insulation board 4 is circular arc.
The material of the transparent insulation board 4 is the transparent material of solar radiation wave band high transmittance.
The transparent material of the solar radiation wave band high transmittance is borosilicate glass, high transparency plastics thoroughly high.
The medial surface of the transparent insulation board 4 is provided with reflecting layer, or lateral surface is provided with reflecting layer, or interior lateral surface is equipped with
Reflecting layer.
The material in the reflecting layer is with the property in solar radiation wave band high transmission, mid and far infrared wave band high reflection
Selectivity passes through coating.
The selectivity is the Zinc oxide coating of the indium oxide coating, adulterated al or gallium of doped tin through coating.
The outer surface of said inner tube 3 is provided with interior pipe coating 31, and the material of interior pipe coating 31 is solar selectively absorbing material.
The solar selectively absorbing material is that metal oxide ceramic plates film strips or black chrome coating.
Radial direction between the transparent insulation board 4 and inner tube 3 is smaller than 15mm.
Advantageous Effects of the invention embody in the following areas：
1. the external radiation heat loss of inner tube is effectively reduced.Due to set up transparent insulation board inner side or outside or inside and outside
For selectivity passes through coating, it has the characteristic in solar radiation wave band high transmittance, mid and far infrared wave band high reflectance.Inner tube
Radiation wave band extreme portions are in mid and far infrared wave band, and the energy of the inner pipe portion radiation that transparent insulation board can be covered is anti-
Penetrate.What the transparent insulation board of the present invention was placed will be as close to inner tube, without being contacted with inner tube, because transparent insulation board and inner tube
Radial direction spacing is small, makes insulation board larger to inner tube view factor, and the emittance major part that can be will reflect back into is reflected back inner tube.Thoroughly
Bright insulation board could be arranged to radially be smaller than 15mm with inner tube, and cross section is circular arc, or makes it to inner tube view factor
Other shapes as big as possible.
From from the aspect of radiation heat transfer thermal resistance, increase transparent insulation board, not only add transparent insulation board surface resistance of heat transfer, and
Covered portionss inner tube is reduced to glass tube and the transmitance of sky radiation, inner tube is increased to glass tube and sky radiation
Space thermal resistance.Therefore set up transparent insulation board and reached the radiation loss and inner tube that reduce inner tube to outer tube through outer tube to sky
The purpose of radiation loss.
2. transparent insulation board is small to vacuum heat collection pipe reception sun direct projection energy interference.Due to the transparent insulation board tool set up
Have the characteristics of solar radiation wave band high transmittance, the influence that transparent insulation board receives direct solar radiation to inner tube can be made very
It is small, preferably improve transparent insulation board hot property.
3. as above-mentioned 1, described in 2 points, although setting up transparent insulation board and have lost a part can receive solar radiation energy, but
It is that the radiation loss reduced due to the effect in transparent insulation board reflecting layer is the received solar radiation lost by primary Calculation
2-4 times of energy, i.e., transparent insulation board effect is obvious.
4. process is simple, reliability is high.The processing work of transparent insulation board is set up in annular housing between the inner and outer pipe sections
Skill is fairly simple.Transparent insulation board is in vacuum environment, environmental attack can be avoided, with spatter property and persistent spy
Point.
In a word, a kind of high-temperature vacuum heat-collecting tube with transparent insulation board of the present invention is ensureing insulation board to vacuum heat-collecting
Pipe receive sun direct projection energy interference it is small while effectively reduce the external radiation heat loss of inner tube, be a kind of process is simple, can
By property it is high, can effectively reduce the high-temperature vacuum heat-collecting tube of the transparent insulation board of band of heat waste.
Brief description of the drawings
Fig. 1 is the overall structure diagram of solar groove type focussing heat-collecting device.
Fig. 2 is the cross-sectional view of the high-temperature vacuum heat-collecting tube with transparent insulation board of the invention.
Fig. 3 is the fundamental diagram of solar groove type focussing heat-collecting device.
Fig. 4 is that the interior lateral surface of transparent insulation board is equipped with the schematic diagram in reflecting layer.
Sequence number in upper figure：Slot-type optical collector 1, outer tube 2, inner tube 3, interior pipe coating 31, transparent insulation board 4, reflecting layer 41.
Specific embodiment
Below in conjunction with the accompanying drawings, the present invention is further described by embodiment.
Embodiment 1
Referring to Fig. 1 and Fig. 2, a kind of high-temperature vacuum heat-collecting tube with transparent insulation board includes slot-type optical collector 1, outer tube 2 and inner tube
3, outer tube 2 and inner tube 3 are the pipe being coaxially disposed.
Transparent insulation board 4 is installed, the cross section of transparent insulation board 4 is circular arc, in covering between outer tube 2 and inner tube 3
Side of the pipe 3 without optically focused hot spot, the material of transparent insulation board 4 is the transparent material of solar radiation wave band high transmittance, specially
Borosilicate glass thoroughly high.Transparent insulation board 4 has to solar radiation wave band high transmission, centering far infrared radiation wave band high reflection
Characteristic.The medial surface of transparent insulation board 4 is provided with reflecting layer 41, and the material in reflecting layer 41 is the indium oxide material of transparent doped tin
Material, with the property in solar radiation wave band high transmission, mid and far infrared wave band high reflection.
The outer surface of inner tube 3 is provided with interior pipe coating 31, and the material of interior pipe coating 31 is solar selectively absorbing material, specially
Black chrome coating.
As shown in figure 3, transparent insulation board 4 is oppositely arranged with slot-type optical collector 1, and solar groove type focussing heat-collecting device
Vertical trench concentrator unthreaded hole enters slot-type optical collector 1 as far as possible to make sun incident radiation all the time by automatic tracking position of sun,
Transparent insulation board 4 will not stop the light reflected by slot-type optical collector 1.The transparent insulation board 4 set up, its transparency carrier is high saturating
Material, reflecting layer 41 passes through coating for selectivity, all transparent hides heat with the characteristics of solar radiation wave band high transmission, making to set up
The solar radiation that plate 4 causes reduces less.Meanwhile, transparent insulation board 4 is smaller with the spacing of inner tube 3, reflecting layer 41 is regarded inner tube
Ascent is very big, the centering far infrared band high reflection of reflecting layer 41, the big portion of energy of the partial radiation of inner tube 3 that can be covered
Divide and be reflected back inner tube 3, reach the purpose of less radiation heat loss.
As shown in figure 3, the diameter 70mm of the present embodiment inner tube 3, outer tube 2 internal diameter 115mm, external diameter 120mm, transparent insulation board 4
It is 7.5mm with the radial direction spacing of inner tube 3, the outside wall surface temperature of inner tube 3 is 700K, and environment temperature is 300K, and solar irradiation intensity is
1000W/m2, the emissivity of interior pipe coating 31 is 0.1, and the reflectivity of reflecting layer 41 is 0.95, the solar transmittance of transparent insulation board 4
It is 0.9.It is calculated by above-mentioned condition, is not provided with vacuum heat collection pipe heat waste 267.78W/m during transparent insulation board 4, is set and hide
During hot plate 4, vacuum heat collection pipe heat waste 240.72W/m, thermal loss reduces 10.11%.
Embodiment 2
Referring to Fig. 4, the interior lateral surface of transparent insulation board 4 is equipped with reflecting layer 41, and the material in reflecting layer 41 is the oxidation of adulterated al
Zinc material, with the property in solar radiation wave band high transmission, mid and far infrared wave band high reflection.Other structures are with embodiment 1.
The diameter 70mm of the present embodiment inner tube 3, outer tube 2 internal diameter 115mm, external diameter 120mm, transparent insulation board 4 is with inner tube 3 radially
Spacing is 7.5mm, and the outside wall surface temperature of inner tube 3 is 700K, and environment temperature is 300K, and solar irradiation intensity is 800W/m2, inner tube painting
31 emissivity of layer are 0.1, and the reflectivity of reflecting layer 41 is 0.95, and the solar transmittance of transparent insulation board 3 is 0.9.By above-mentioned
Condition is calculated, and is not provided with vacuum heat collection pipe heat waste 256.38W/m during transparent insulation board 4, when setting transparent insulation board 4, very
Empty heat collecting pipe heat waste medial surface is provided with reflecting layer 227.47W/m, and thermal loss reduces 13.6%.
Solar radiation energy can be received although setting up transparent insulation board 4 and have lost a part, due to reflecting layer 41
The radiation loss for reducing is acted on by primary Calculation up to 2-5 times of reception solar radiation energy, that is, is set up transparent insulation board 4 and is made
With obvious.And it is fairly simple to set up the processing technology of transparent insulation board 4 in annular housing between inner tube 3 and outer tube 2, transparent screening
Hot plate 4 is in vacuum environment, environmental attack can be avoided, with spatter property and persistence.
Transparent insulation board sets up technique can be by inner tube two ends setting up adiabatic transparent fixed structure or scribbling solar energy
The metal fixed structure of coating for selective absorption is realized, to reduce additional heat waste as far as possible.
Claims (10)
1. a kind of high-temperature vacuum heat-collecting tube with transparent insulation board, including slot-type optical collector（1）, outer tube（2）And inner tube（3）, institute
State outer tube（2）And inner tube（3）It is the pipe being coaxially disposed, it is characterised in that：
The outer tube（2）And inner tube（3）Between be provided with transparent insulation board（4）, cover inner tube（3）Side without optically focused hot spot, thoroughly
Bright insulation board（4）With to solar radiation wave band high transmission, the characteristic of centering far infrared radiation wave band high reflection.
2. a kind of high-temperature vacuum heat-collecting tube with transparent insulation board according to claim 1, it is characterised in that：The transparent screening
Hot plate（4）Cross section be circular arc.
3. a kind of high-temperature vacuum heat-collecting tube with transparent insulation board according to claim 1, it is characterised in that：The transparent screening
Hot plate（4）Material for solar radiation wave band high transmittance transparent material.
4. a kind of high-temperature vacuum heat-collecting tube with transparent insulation board according to claim 3, it is characterised in that：The sun spoke
The transparent material of ejected wave section high transmittance is borosilicate glass, high transparency plastics thoroughly high.
5. a kind of high-temperature vacuum heat-collecting tube with transparent insulation board according to claim 1, it is characterised in that：The transparent screening
Hot plate（4）Medial surface be provided with reflecting layer, or lateral surface is provided with reflecting layer, or interior lateral surface is equipped with reflecting layer.
6. a kind of high-temperature vacuum heat-collecting tube with transparent insulation board according to claim 5, it is characterised in that：The reflecting layer
Material be to pass through coating with the selectivity in solar radiation wave band high transmission, the property of mid and far infrared wave band high reflection.
7. a kind of high-temperature vacuum heat-collecting tube with transparent insulation board according to claim 6, it is characterised in that：The selectivity
It is the Zinc oxide coating of the indium oxide coating, adulterated al or gallium of doped tin through coating.
8. a kind of high-temperature vacuum heat-collecting tube with transparent insulation board according to claim 1, it is characterised in that：Said inner tube
（3）Outer surface is provided with interior pipe coating（31）, interior pipe coating（31）Material is solar selectively absorbing material.
9. a kind of high-temperature vacuum heat-collecting tube with transparent insulation board according to claim 8, it is characterised in that：The solar energy
Selective absorbing material is that metal oxide ceramic plates film strips or black chrome coating.
10. a kind of high-temperature vacuum heat-collecting tube with transparent insulation board according to claim 1, it is characterised in that：It is described transparent
Insulation board（4）With inner tube（3）Between radial direction be smaller than 15mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611107803.2A CN106766258B (en) | 2016-12-06 | 2016-12-06 | A kind of high-temperature vacuum heat-collecting tube of the transparent insulation board of band |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611107803.2A CN106766258B (en) | 2016-12-06 | 2016-12-06 | A kind of high-temperature vacuum heat-collecting tube of the transparent insulation board of band |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN106766258A true CN106766258A (en) | 2017-05-31 |
| CN106766258B CN106766258B (en) | 2019-02-12 |
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| CN201611107803.2A Active CN106766258B (en) | 2016-12-06 | 2016-12-06 | A kind of high-temperature vacuum heat-collecting tube of the transparent insulation board of band |
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6244264B1 (en) * | 1999-06-09 | 2001-06-12 | Solar Enterprises, International, Llc | Non-imaging optical illumination system |
| CN2485597Y (en) * | 2001-05-07 | 2002-04-10 | 徐鸿胜 | Focusing vacuum glass solar heat collecting pipe |
| CN2655127Y (en) * | 2003-05-19 | 2004-11-10 | 江希年 | All glass solar vacuum tube |
| CN104296396A (en) * | 2014-10-29 | 2015-01-21 | 武汉鑫博茗科技发展有限公司 | Solar high-temperature heat collecting device |
| CN105157257A (en) * | 2015-09-28 | 2015-12-16 | 中国科学技术大学 | Slot type light gathering type solar vacuum heat collecting pipe |
| CN205079478U (en) * | 2015-10-20 | 2016-03-09 | 中国科学技术大学 | Slot type solar energy spotlight solar collecting system |
| CN206449900U (en) * | 2016-12-06 | 2017-08-29 | 中国科学技术大学 | A kind of high-temperature vacuum heat-collecting tube of the transparent insulation board of band |
-
2016
- 2016-12-06 CN CN201611107803.2A patent/CN106766258B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6244264B1 (en) * | 1999-06-09 | 2001-06-12 | Solar Enterprises, International, Llc | Non-imaging optical illumination system |
| CN2485597Y (en) * | 2001-05-07 | 2002-04-10 | 徐鸿胜 | Focusing vacuum glass solar heat collecting pipe |
| CN2655127Y (en) * | 2003-05-19 | 2004-11-10 | 江希年 | All glass solar vacuum tube |
| CN104296396A (en) * | 2014-10-29 | 2015-01-21 | 武汉鑫博茗科技发展有限公司 | Solar high-temperature heat collecting device |
| CN105157257A (en) * | 2015-09-28 | 2015-12-16 | 中国科学技术大学 | Slot type light gathering type solar vacuum heat collecting pipe |
| CN205079478U (en) * | 2015-10-20 | 2016-03-09 | 中国科学技术大学 | Slot type solar energy spotlight solar collecting system |
| CN206449900U (en) * | 2016-12-06 | 2017-08-29 | 中国科学技术大学 | A kind of high-temperature vacuum heat-collecting tube of the transparent insulation board of band |
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| Publication number | Publication date |
|---|---|
| CN106766258B (en) | 2019-02-12 |
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