CN106766258B - A kind of high-temperature vacuum heat-collecting tube of the transparent insulation board of band - Google Patents
A kind of high-temperature vacuum heat-collecting tube of the transparent insulation board of band Download PDFInfo
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- CN106766258B CN106766258B CN201611107803.2A CN201611107803A CN106766258B CN 106766258 B CN106766258 B CN 106766258B CN 201611107803 A CN201611107803 A CN 201611107803A CN 106766258 B CN106766258 B CN 106766258B
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- insulation board
- transparent insulation
- tube
- inner tube
- vacuum heat
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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
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Life Sciences & Earth Sciences (AREA)
- Sustainable Development (AREA)
- Sustainable Energy (AREA)
- Thermal Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Thermal Insulation (AREA)
Abstract
The present invention relates to a kind of high-temperature vacuum heat-collecting tubes of the transparent insulation board of band.Including slot-type optical collector, outer tube and inner tube, the outer tube and inner tube are the round tube being coaxially disposed；It is equipped with insulation board between the outer tube and inner tube, covers side of the inner tube top without optically focused hot spot, 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 guarantee insulation board to evacuated collector tube receive direct sunlight energy interference it is small while, effectively reduce the external radiation heat loss of inner tube, be a kind of simple process, high reliablity, the high-temperature vacuum heat-collecting tube with transparent insulation board that heat waste can be effectively reduced.
Description
Technical field
The invention belongs to solar energy heat utilization technical fields, are related to solar groove type focussing heat-collecting device, and in particular to
A kind of high-temperature vacuum heat-collecting tube of the transparent insulation board of band.
Background technique
Trough solar power generation is that current application is most wide, 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 evacuated collector tube outer tube and inner tube, greatly inhibit convection current between the two and
It is thermally conductive, therefore evacuated collector tube inner tube is mainly externally radiated in a manner of radiation heat transfer.According to Stefan-Boltzmann law, object
The external radiations heat energy of body is related to 4 powers of its temperature, and the emissivity of the coating for selective absorption in outer wall of inner tube face is with inner tube
The raising 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 raising of pipe heat-collecting temperature, external radiation heat loss can increased dramatically；Simultaneously with the raising of heat-collecting temperature, inner tube is to external spectrum
The corresponding wavelength of radiation peak gradually becomes smaller and close to solar radiation wave band, and outer tube has high transmittance to solar radiation wave band,
This enables the radiations heat energy for having quite a few wave band to pass through outer tube, cause inner tube through outer tube directly and atmospheric environment
Radiation loss increase.So high-temperature vacuum heat-collecting tube, under higher heat-collecting temperature, external radiation heat loss is very big, seriously affect
Thermal-collecting tube collecting efficiency, therefore the radiation heat loss for reducing high-temperature vacuum heat-collecting tube has great significance.
Summary of the invention
In order to realize in the case where radiation heat loss's accounting is high, the radiation heat loss of evacuated collector tube is reduced, solar energy is improved
Utilization efficiency, the present invention provide a kind of high-temperature vacuum heat-collecting tube of transparent insulation board of band.
A kind of high-temperature vacuum heat-collecting tube of the transparent insulation board of band includes slot-type optical collector 1, outer tube 2 and inner tube 3, the outer tube
2 and inner tube 3 be coaxial arrangement round tube；
It is equipped with transparent insulation board 4 between the outer tube 2 and inner tube 3, covers side of the inner tube 3 without optically focused hot spot, transparent screening
Hot plate 4 has to solar radiation wave band high transmission, the characteristic of centering far infrared radiation wave band high reflection.
The technical solution further limited is as follows:
The cross section of the transparent insulation board 4 is arc-shaped.
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 high borosilicate glass, high transparency plastics thoroughly.
The medial surface of the transparent insulation board 4 is equipped with reflecting layer or lateral surface is equipped 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 penetrates coating.
Zinc oxide coating of the selectivity through the indium oxide coating that coating is doped tin, adulterated al or gallium.
3 outer surface of said inner tube is equipped with interior pipe coating 31, and interior 31 material of pipe coating is solar selectively absorbing material.
The solar selectively absorbing material is that metal oxide ceramic plates film strips or black chrome coating.
Radial spacing between the transparent insulation board 4 and inner tube 3 is less than 15mm.
Advantageous effects of the invention embody in the following areas:
1. effectively reducing the external radiation heat loss of inner tube.Due on the inside of the transparent insulation board added or outside or inside and outside
Two sides are that selectivity penetrates coating, have 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, the energy for the inner pipe portion radiation that transparent insulation board can be covered
Reflection.The transparent insulation board of the present invention place will as close to inner tube, without being contacted with inner tube because transparent insulation board with it is interior
Pipe radial spacing is small, keeps insulation board larger to inner tube view factor, and the radiation energy that can be will reflect back into largely is reflected back inner tube.
Transparent insulation board can be set to be less than 15mm with inner tube radial spacing, and cross section is arc-shaped, or makes it to inner tube visual angle system
Number other shapes as big as possible.
From the aspect of radiation heat transfer thermal resistance, increase transparent insulation board, not only adds transparent insulation board surface resistance of heat transfer, but also
Covered portionss inner tube is reduced to the transmitance of glass tube and sky radiation, increases inner tube to glass tube and sky radiation
Space thermal resistance.Therefore it adds transparent insulation board and has 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. it is small that transparent insulation board receives direct sunlight energy interference to evacuated collector tube.Due to the transparent insulation board tool added
Have the solar radiation wave band high transmittance the characteristics of, transparent insulation board can be made to receive the influence of direct solar radiation very to inner tube
It is small, preferably improve transparent insulation board hot property.
3. as described in above-mentioned 1,2 point, although adding transparent insulation board has lost the receivable solar radiation energy of a part,
It is since the reduced radiation loss of the effect in transparent insulation board reflecting layer passes through the receivable solar radiation that primary Calculation is loss
2-4 times of energy, i.e., transparent insulation board effect are obvious.
4. simple process, high reliablity.The processing work of transparent insulation board is added in annular housing between the inner and outer pipe sections
Skill is fairly simple.Transparent insulation board is in vacuum environment, can have spatter property and persistent spy to avoid environmental attack
Point.
In short, a kind of high-temperature vacuum heat-collecting tube of the transparent insulation board of band of the present invention is guaranteeing insulation board to vacuum heat-collecting
Pipe receive direct sunlight energy interference it is small while effectively reduce the external radiation heat loss of inner tube, be a kind of simple process, can
High-temperature vacuum heat-collecting tube with transparent insulation board high by property, that heat waste can be effectively reduced.
Detailed description of the invention
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 of the invention with transparent insulation board.
Fig. 3 is the working principle 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.
Serial 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
With reference to the accompanying drawing, 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 of the transparent insulation board of band includes slot-type optical collector 1,2 and of outer tube
Inner tube 3, outer tube 2 and inner tube 3 are the round tube of coaxial arrangement.
Transparent insulation board 4 is installed between outer tube 2 and inner tube 3, the cross section of transparent insulation board 4 be it is arc-shaped, in covering
Side of the pipe 3 without optically focused hot spot, the material of transparent insulation board 4 are the transparent material of solar radiation wave band high transmittance, specially
High saturating borosilicate glass.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 equipped with reflecting layer 41, and the material in reflecting layer 41 is the indium oxide material of transparent doped tin
Material has the property in solar radiation wave band high transmission, mid and far infrared wave band high reflection.
3 outer surface of inner tube is equipped with interior pipe coating 31, and interior 31 material of pipe coating 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
Sun incident radiation vertical trench condenser unthreaded hole as far as possible is set to enter slot-type optical collector 1 by automatically tracking position of sun always,
Transparent insulation board 4 will not stop the light reflected by slot-type optical collector 1.The transparent insulation board 4 added, transparent substrate are high saturating
Material, reflecting layer 41 are that selectivity penetrates coating, all have the characteristics that make to add transparent screening heat in solar radiation wave band high transmission
Solar radiation caused by plate 4 reduces less.Meanwhile transparent insulation board 4 and 3 spacing of inner tube are smaller, regard reflecting layer 41 to inner tube
Ascent is very big, 41 centering far infrared band high reflection of reflecting layer, the big portion of energy for 3 partial radiation of inner tube that can be covered
Divide and be reflected back inner tube 3, achievees the purpose that less radiation heat loss.
As shown in figure 3,3 diameter 70mm of the present embodiment inner tube, 2 internal diameter 115mm of outer tube, outer diameter 120mm, transparent insulation board 4
It is 7.5mm with 3 radial spacing of inner tube, 3 outside wall surface temperature of inner tube is 700K, environment temperature 300K, and solar irradiation intensity is
1000W/m2, interior 31 emissivity of pipe coating is 0.1, and 41 reflectivity of reflecting layer is 0.95, transparent 4 solar transmittance of insulation board
It is 0.9.It is calculated by above-mentioned condition, evacuated collector tube heat waste 267.78W/m when not set transparent insulation board 4, setting hides
When hot plate 4, evacuated collector tube 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 adulterated al
Zinc oxide material has the property in solar radiation wave band high transmission, mid and far infrared wave band high reflection.The same embodiment of other structures
1。
3 diameter 70mm of the present embodiment inner tube, 2 internal diameter 115mm of outer tube, outer diameter 120mm, transparent insulation board 4 and inner tube 3 are radial
Spacing is 7.5mm, and 3 outside wall surface temperature of inner tube is 700K, and environment temperature 300K, solar irradiation intensity is 800W/m2, inner tube painting
31 emissivity of layer are 0.1, and 41 reflectivity of reflecting layer is 0.95, and transparent 3 solar transmittance of insulation board is 0.9.By above-mentioned
Condition is calculated, evacuated collector tube heat waste 256.38W/m when not set transparent insulation board 4, when transparent insulation board 4 is arranged, very
Empty heat collecting pipe heat waste medial surface is equipped with reflecting layer 227.47W/m, and thermal loss reduces 13.6%.
Although adding transparent insulation board 4 has lost the receivable solar radiation energy of a part, due to reflecting layer 41
2-5 times of reduced radiation loss by primary Calculation up to reception solar radiation energy is acted on, that is, adds transparent insulation board 4 and makees
With obvious.And the processing technology for adding transparent insulation board 4 in annular housing between inner tube 3 and outer tube 2 is fairly simple, transparent screening
Hot plate 4 is in vacuum environment, can have spatter property and persistence to avoid environmental attack.
Transparent insulation board adds technique can be by adding the transparent fixed structure of insulation at inner tube both ends or being coated with solar energy
The metal fixed structure of coating for selective absorption is realized, to reduce additional heat waste to the greatest extent.
Claims (5)
1. a kind of high-temperature vacuum heat-collecting tube of the transparent insulation board of band, including slot-type optical collector (1), outer tube (2) and inner tube (3), institute
It states outer tube (2) and inner tube (3) is the round tube of coaxial arrangement, it is characterised in that:
Transparent insulation board (4) are equipped between the outer tube (2) and inner tube (3), cover the side of inner tube (3) without optically focused hot spot, institute
The radial spacing stated between transparent insulation board (4) and inner tube (3) is less than 15mm；The cross section of the transparent insulation board (4) is circle
Arc, the material of the transparent insulation board (4) are the transparent material of solar radiation wave band high transmittance；The transparent insulation board
(4) medial surface is equipped with reflecting layer or lateral surface is equipped with reflecting layer or interior lateral surface is equipped with reflecting layer；Transparent insulation board (4)
With to solar radiation wave band high transmission, the characteristic of centering far infrared radiation wave band high reflection；
Said inner tube (3) outer surface is equipped with interior pipe coating (31), and interior pipe coating (31) material is solar selectively absorbing material.
2. the high-temperature vacuum heat-collecting tube of the transparent insulation board of a kind of band according to claim 1, it is characterised in that: the sun spoke
The transparent material of ejected wave section high transmittance is high borosilicate glass, high transparency plastics thoroughly.
3. the high-temperature vacuum heat-collecting tube of the transparent insulation board of a kind of band according to claim 1, it is characterised in that: the reflecting layer
Material be with the selectivity in solar radiation wave band high transmission, the property of mid and far infrared wave band high reflection penetrate coating.
4. the high-temperature vacuum heat-collecting tube of the transparent insulation board of a kind of band according to claim 3, it is characterised in that: the selectivity
Through the Zinc oxide coating of indium oxide coating, adulterated al or gallium that coating is doped tin.
5. the high-temperature vacuum heat-collecting tube of the transparent insulation board of a kind of band according to claim 1, it is characterised in that: the solar energy
Selective absorbing material is that metal oxide ceramic plates film strips or black chrome coating.
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 |
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| Publication Number | Publication Date |
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| CN106766258A CN106766258A (en) | 2017-05-31 |
| CN106766258B true 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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| CN106766258A (en) | 2017-05-31 |
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