CN108362010A - A kind of groove type solar thermal-collecting tube for high temperature - Google Patents
A kind of groove type solar thermal-collecting tube for high temperature Download PDFInfo
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- CN108362010A CN108362010A CN201810459840.2A CN201810459840A CN108362010A CN 108362010 A CN108362010 A CN 108362010A CN 201810459840 A CN201810459840 A CN 201810459840A CN 108362010 A CN108362010 A CN 108362010A
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- outer glass
- glass tube
- type solar
- groove type
- inner pipe
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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
A kind of groove type solar thermal-collecting tube for high temperature, including outer glass tube (2) and metal inner pipe (1), metal inner pipe (1) has high-temperature-resistant selective absorber coatings (3), outer glass tube (2) coaxial package forms ring vaccum enclosure space (4) outside metal inner pipe (1) between outer glass tube (2) and metal inner pipe (1).The inner wall of outer glass tube (2) is circumferentially divided into transparent surface (5) and non-transparent face (6) two parts, the inner wall transparent surface (5) of outer glass tube (2) has antireflective coating, positioned at optically focused side, the non-transparent face of inner wall (6) of outer glass tube (2) has reflecting layer, positioned at non-concentrating side, which is silver film, aluminum membranous layer or the copper film layer that reflectivity is more than 85%.
Description
Technical field
The present invention relates to a kind of groove type solar thermal-collecting tubes.
Background technology
Trough type solar power generation is that business application is most wide in the world at present, lower-cost solar energy thermal-power-generating technology,
It heats its lower part for using paraboloid sexual reflex mirror that sun light reflection is focused on to the groove type solar thermal-collecting tube positioned at its focal line
Tube fluid, and then generate high-temperature steam pushing turbine and generate electricity.Groove type solar thermal-collecting tube is trough type solar hair
The most key component in electric system from light to thermal transition, is generally made of metal inner pipe and coaxial outer glass tube, in order to subtract
Few convection heat losses form closed ring vaccum space, the plating of metal inner pipe outside wall surface between outer glass tube and metal inner pipe
The coating for selective absorption for having high-absorbility, low-launch-rate further reduced the radiation heat loss of metal inner pipe.This slot type
The generally a length of 4060mm of solar energy heat collection pipe, metal inner pipe outer diameter be 70mm, pipe in by heat-transfer working medium be generally conduction oil,
The conduction oil runs maximum temperature no more than 400 DEG C, is otherwise easy for generating pyrolytic.
In order to further increase trough type solar power generation efficiency, using the slot-type optical collector and the highest temperature of bigger focusing ratio
Degree reaches 550 DEG C of fused salt, or water/steam more than 400 DEG C becomes trough type solar power generation technology as heat-transfer working medium
Further development trend.But it is in 4 times since the radiation heat loss of groove type solar thermal-collecting tube increases with heat-transfer working medium temperature
The increased relationship in side, causes heat loss to increase and increased dramatically with Temperature of Working, especially fused salt working medium setting temperature is at 200 DEG C
More than, fused salt working medium solidifies in order to prevent, and system night needs to maintain hot operation, and operation heat loss is caused to significantly improve,
Increase operating cost.Although steam turbine power generation efficiency improves, groove type solar collecting system since vapor (steam) temperature improves
The thermal efficiency due to heat loss increase and reduce, cause higher temperature fused salt or water/steam as heat-transfer working medium slot type too
Positive energy hot generation technology develops slowly.Meanwhile the trough type solar power generation skill using fused salt or water/steam as heat-transfer working medium
Art, due to needing higher focusing ratio, concentrator opening width bigger that part optically focused hot spot is caused to exceed metal inner pipe diameter
Width wastes part sun optically focused radiation energy.Therefore, develop can be applied to higher temperature, bigger focusing ratio slot type too
Positive energy thermal-collecting tube has great importance to improving trough type solar power generation efficiency and performance driving economy.
Invention content
It is an object of the invention to overcome the prior art, a kind of groove type solar thermal-arrest for high temperature is proposed
Pipe, the present invention significantly reduce groove type solar by using the method for increasing reflecting layer at the non-concentrating place of outer glass tube inner wall
The radiation heat loss of thermal-collecting tube, while the optically focused for overflowing metal inner pipe range can be reflected into metal again by the reflecting layer
Guan Shang.The configuration of the present invention is simple does not change the life of the structure and groove type solar thermal-collecting tube of traditional groove type solar thermal-collecting tube
Produce equipment, be highly suitable for fused salt or water at higher temperature, bigger focusing ratio trough type solar hair of the steam as heat-transfer working medium
Electric system can significantly reduce operation heat waste and cost, improve system generating efficiency.
To achieve the goals above, the present invention adopts the following technical scheme that：
A kind of groove type solar thermal-collecting tube for high temperature, including outer glass tube and metal inner pipe, metal inner pipe have resistance to
The coating for selective absorption of high temperature, outer glass tube is coaxial to be sleeved on outside metal inner pipe, outer glass tube and metal inner pipe it
Between formed vacuum ring seal space.The inner wall of the outer glass tube is circumferentially divided into transparent surface and non-transparent face two parts；
The inner wall transparent surface of the outer glass tube has antireflective coating；The non-transparent face of inner wall of the outer glass tube has reflection
Layer.
Non-transparent face on the outer glass tube inner wall is located at non-concentrating face, and the reflecting layer that the non-transparent face has is
Reflectivity is more than 85% silver film, aluminum membranous layer or copper film layer, and the reflecting layer can pass through simple vacuum vapor plating, change
The methods of plated film or direct pad pasting is learned to prepare, it is simple and practicable；The reflecting layer is due to reflectivity height, the light that can overflow optically focused
Line is reflected back on metal inner pipe again, improves the effective rate of utilization of sun optically focused radiation.Meanwhile the reflecting layer is using silver
Film layer, aluminum membranous layer or copper film layer also have lower emissivity, for the emissivity of outer glass tube inner wall 89%, with gold
Radiation heat transfer, which loses, between category inner tube is substantially reduced.
It is more than that 85% reflective aluminium sheet makes that the reflecting layer in the non-transparent face, which can also use reflectivity, reflective aluminium sheet
It is inserted directly into outer glass tube, extends axially through multiple gilled rings and be fixed on the inner wall of outer glass tube.
Transparent surface on the outer glass tube inner wall is located at optically focused side, and the antireflective coating that the transparent surface has uses
Silica or titanium dioxide antireflective coating, sun light transmission rate prepared by sol-gel method can reach 94% or more.
Sun optically focused side of the transparent surface towards slot-type optical collector, and the non-transparent face is in outer glass tube inner wall
Circumferential proportion is no more than 50%, ensures that more sun optically focused radiation project in outer glass tube.
It includes antireflective coating, low absorption layer, high-selenium corn layer and infrared high reflection layer that the coating for selective absorption, which uses,
Multilayered structure be made.The solar spectrum absorptivity of the coating for selective absorption be not less than 92%, at 400 DEG C its
Emissivity is no more than 14%.
Heat-transfer working medium in metal inner pipe is fused salt or water/steam.
The technical advantages of the present invention are that：
1) it is transparent surface in sun optically focused side at least 50% or more on outer glass tube internal face, transparent surface has anti-reflection film
Layer, improves the light transmittance of sunlight；On outer glass tube internal face the non-concentrating side of the sun be non-transparent face, have reflecting layer, though
Part direct solar radiation energy is so reduced, but non-transparent face reflecting layer has low-down emissivity, since reflectivity is got over
Height, emissivity is lower, and therefore, radiation heat transfer loses and will be substantially reduced between the reflecting layer and metal inner pipe, to reduce system fortune
Row heat loss.
2) in big opening groove type solar system, sun optically focused hot spot is easy to overflow metal inner pipe range, the light exceeded
After line is on the reflecting layer for reaching outer glass tube inner wall, it is reflected on metal inner pipe again by reflecting layer with high reflectivity,
Improve the effective rate of utilization to sun optically focused.
3) present invention is simple and practicable for the groove type solar thermal-collecting tube production method of high temperature, does not change traditional slot type too
The structure and other apparatus for production line of positive energy thermal-collecting tube, can significantly reduce operation heat waste and cost, improve system generating efficiency.
Description of the drawings
Fig. 1 is the transverse cross-sectional view of the groove type solar thermal-collecting tube of the embodiment of the present invention 1；
Fig. 2 is light principle of reflection figure in the groove type solar system operation of the embodiment of the present invention 1；
Fig. 3 is the transverse cross-sectional view of the groove type solar thermal-collecting tube of the embodiment of the present invention 2；
Fig. 4 is the transverse cross-sectional view of the groove type solar thermal-collecting tube of the embodiment of the present invention 3；
Fig. 5 is the longitudinal sectional drawing of the groove type solar thermal-collecting tube of the embodiment of the present invention 3；
In figure：1 metal inner pipe, 2 outer glass tubes, 3 coating for selective absorption, 4 ring vaccum enclosure spaces, 5 transparent surfaces, 6
Non-transparent face, 7 heat-transfer working mediums, 8 slot type transmitting mirrors, 9 fixtures.
Specific implementation mode
It elaborates below in conjunction with the accompanying drawings to embodiments of the present invention.
Embodiment 1 of the present invention for the groove type solar thermal-collecting tube of high temperature is as depicted in figs. 1 and 2, including outer glass tube 2
With metal inner pipe 1, metal inner pipe 1 has high-temperature-resistant selective absorber coatings 3, and 2 coaxial package of outer glass tube is in metal inner pipe 1
Outside forms ring vaccum enclosure space 4 between outer glass tube 2 and metal inner pipe 1.Heat-transfer working medium 7 in metal inner pipe 1 is
High-temperature molten salt.Coating for selective absorption 3 using magnetron sputtering apparatus make, be followed successively by from outside to inside antireflective coating, low absorption layer,
High-selenium corn layer and infrared high reflection layer, totally four layers.The absorptivity of the coating for selective absorption 3 is 95%, is emitted at 400 DEG C
Rate is 10%.The inner wall of outer glass tube 2 is circumferentially divided into 6 two parts of transparent surface 5 and non-transparent face.Wherein outer glass tube 2 inner wall
Transparent surface 5 has antireflective coating, and sun optically focused side of the transparent surface 5 towards slot type speculum, transparent surface 5 is in outer glass tube 2
Wall circumferential direction proportion is 50%, ensures that more sun optically focused radiation project in outer glass tube 2.The anti-reflection film of transparent surface 5
Layer is the antireflecting silicon dioxide film layer prepared using the method for collosol and gel, and the antireflective coating sun light transmission rate of transparent surface 5 can
To reach 95%, the light transmittance of thermal-collecting tube is improved.The non-transparent face 6 of 2 inner wall of outer glass tube has reflecting layer, non-transparent face 6
Positioned at non-concentrating face, the reflecting layer in non-transparent face 6 is the aluminum membranous layer prepared by vacuum evaporation coating film method, non-transparent face 6
Reflecting layer reflectivity be 92%, and 2 inner wall circumferential direction proportion of outer glass tube be 50%, optically focused can be overflowed metal inner pipe
2 light is reflected back again on metal inner pipe 2, improves the effective rate of utilization of sun optically focused radiation.And the hair of the aluminum membranous layer
Rate only 4% or so is penetrated, the emissivity 89% of 2 inner wall of outer glass tube is much smaller than, the radiation between the aluminum membranous layer and metal inner pipe 2 is changed
Heat loss will be substantially reduced compared to traditional thermal-collecting tube.
The present invention is used for the embodiment 2 of the groove type solar thermal-collecting tube of high temperature as shown in figure 3, including outer glass tube 2 and gold
Belong to inner tube 1.Metal inner pipe 1 has high-temperature-resistant selective absorber coatings 3, and 2 coaxial package of outer glass tube is outside metal inner pipe 1
Face, forms ring vaccum enclosure space 4 between outer glass tube 2 and metal inner pipe 1, and the heat-transfer working medium 7 in metal inner pipe 1 is
Water/steam.Coating for selective absorption 3 using magnetron sputtering apparatus make, be followed successively by from outside to inside antireflective coating, low absorption layer,
High-selenium corn layer and infrared high reflection layer, totally four layers.The absorptivity of the selection absorber coatings 3 is 93%, and at 400 DEG C, it emits
Rate is 14%.The inner wall of outer glass tube 2 is circumferentially divided into 6 two parts of transparent surface 5 and non-transparent face.The wherein inner wall of outer glass tube 2
Transparent surface 5 has antireflective coating, and sun optically focused side of the transparent surface 5 towards slot type speculum, transparent surface 5 is in 2 inner wall of outer glass tube
Circumferential proportion is 70%, ensures that more sun optically focused radiation project in outer glass tube 2.The antireflective coating of transparent surface 5
For the titanium dioxide antireflective coating prepared using the method for collosol and gel, the antireflective coating sun light transmission rate of transparent surface 5 can be with
Reach 94%, improves the light transmittance of thermal-collecting tube.The non-transparent face 6 of 2 inner wall of outer glass tube has reflecting layer, 6, non-transparent face
In non-concentrating side, the reflecting layer that non-transparent face 6 has is the silverskin that reflectivity is 93%, which is affixed directly to non-transparent face
On 6, non-transparent face 6 is 30% in the proportion of outer glass tube 2 inner wall circumferential direction, and optically focused can be overflowed to the light of metal inner pipe 1
It is reflected back again on metal inner pipe 1, improves the effective rate of utilization of sun optically focused radiation.And the emissivity of the silverskin only 3%
Left and right is much smaller than the emissivity 89% of 2 inner wall of outer glass tube, silverskin tradition compared with 2 radiation heat transfer losses of metal inner pipe
Thermal-collecting tube to be substantially reduced.
Embodiment 3 of the present invention for the groove type solar thermal-collecting tube of high temperature is as shown in Figure 4 and Figure 5, including outer glass tube 2
With metal inner pipe 1, metal inner pipe 1 has high-temperature-resistant selective absorber coatings 3, and 2 coaxial package of outer glass tube is in metal inner pipe 1
Outside, forms ring vaccum enclosure space 4 between outer glass tube 2 and metal inner pipe 1, and the heat-transfer working medium 7 in metal inner pipe 1 is
Fused salt.The coating for selective absorption 3 is made of magnetron sputtering apparatus, is followed successively by antireflective coating, low absorption from outside to inside
Layer, high-selenium corn layer and infrared high reflection layer, totally four layers.The absorptivity of the coating for selective absorption 3 is 96%, at 400 DEG C
When emissivity be 9%.The inner wall of outer glass tube 2 is circumferentially divided into 6 two parts of transparent surface 5 and non-transparent face.2 inner wall of outer glass tube
Sun optically focused side of the transparent surface 5 towards slot type speculum has antireflective coating, and transparent surface 5 is shared by 2 inner wall circumferential direction of outer glass tube
Ratio is 60%, to ensure that more sun optically focused radiation project in outer glass tube 2.The antireflective coating of transparent surface 5 is to use
Antireflecting silicon dioxide film layer prepared by the method for collosol and gel, its sun light transmission rate of the antireflective coating of transparent surface 5 can reach
96%, improve the light transmittance of thermal-collecting tube.There is reflecting layer, non-transparent face 6 to be located at non-in the non-transparent face 6 of 2 inner wall of outer glass tube
Caustic surface, the reflecting layer in non-transparent face 6 are the reflective aluminium sheet that reflectivity is 91%, which passes through equally distributed 4
Snap ring 9 is fixed on 2 inner wall of outer glass tube, and reflective aluminium sheet is 40% in the inner wall circumferential direction proportion of outer glass tube 2, can will be gathered
The light that light overflows metal inner pipe 1 is reflected back again on metal inner pipe 1, improves the effective rate of utilization of sun optically focused radiation.And
And the emissivity of the reflective aluminium sheet only 6% or so, it is much smaller than the emissivity 89% of 2 inner wall of outer glass tube, the reflective aluminium sheet and gold
Belonging to 2 radiation heat transfer losses of inner tube will be substantially reduced compared to traditional thermal-collecting tube.
Claims (8)
1. a kind of groove type solar thermal-collecting tube for high temperature, including outer glass tube (2) and metal inner pipe (1), metal inner pipe (1)
With high-temperature-resistant selective absorber coatings (3), outer glass tube (2) coaxial package is outside metal inner pipe (1), in outer glass tube
(2) ring vaccum enclosure space (4) is formed between metal inner pipe (1), it is characterised in that：The inner wall of outer glass tube (2) is circumferential
It is divided into transparent surface (5) and non-transparent face (6) two parts；The inner wall transparent surface (5) of the outer glass tube (2) has anti-reflection film
Layer；The inner wall transparent surface (5) of the outer glass tube (2) is located at sun optically focused side；The inner wall of the outer glass tube (2) is non-
Smooth surface (6) has reflecting layer；The non-transparent face (6) is located at non-solar optically focused side.
2. the groove type solar thermal-collecting tube according to claim 1 for high temperature, it is characterised in that：The non-transparent face
(6) reflecting layer having is silver film, aluminum membranous layer or the copper film layer that reflectivity is more than 85%.
3. the groove type solar thermal-collecting tube according to claim 1 for high temperature, it is characterised in that：The non-transparent face
(6) reflecting layer is made of the reflective aluminium sheet that reflectivity is more than 85%, and reflective aluminium sheet is inserted directly into outer glass tube (2), edge
It is fixed on axially through multiple gilled rings on the inner wall of outer glass tube (2).
4. the groove type solar thermal-collecting tube according to claim 1 for high temperature, it is characterised in that：The transparent surface
(5) antireflective coating having is the silica prepared using sol-gel method or titanium dioxide antireflective coating.
5. the groove type solar thermal-collecting tube according to claim 1 for high temperature, it is characterised in that：The non-transparent face
(6) it is no more than 50% in outer glass tube (2) inner wall circumferential direction proportion.
6. the groove type solar thermal-collecting tube according to claim 1 for high temperature, it is characterised in that：The selectivity is inhaled
The multilayered structure that coating (3) use includes antireflective coating, low absorption layer, high-selenium corn layer and infrared high reflection layer is received to be made.
7. the groove type solar thermal-collecting tube according to claim 1 for high temperature, it is characterised in that：The selectivity is inhaled
The solar spectrum absorptivity for receiving coating (3) is not less than 92%, and at 400 DEG C, its emissivity is no more than 14%.
8. the groove type solar thermal-collecting tube according to claim 1 for high temperature, it is characterised in that：The metal inner pipe
(1) heat-transfer working medium in is fused salt or water/steam.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810459840.2A CN108362010A (en) | 2018-05-15 | 2018-05-15 | A kind of groove type solar thermal-collecting tube for high temperature |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810459840.2A CN108362010A (en) | 2018-05-15 | 2018-05-15 | A kind of groove type solar thermal-collecting tube for high temperature |
Publications (1)
| Publication Number | Publication Date |
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| CN108362010A true CN108362010A (en) | 2018-08-03 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810459840.2A Pending CN108362010A (en) | 2018-05-15 | 2018-05-15 | A kind of groove type solar thermal-collecting tube for high temperature |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109297203A (en) * | 2018-11-14 | 2019-02-01 | 中国科学技术大学 | A kind of high-temperature vacuum heat-collecting tube for slot light collection collecting system |
| CN109520145A (en) * | 2018-11-22 | 2019-03-26 | 中国科学院电工研究所 | A kind of straight way type solar collector tube and its heat collector |
| CN113669920A (en) * | 2021-09-06 | 2021-11-19 | 北京同创绿源能源科技有限公司 | Method for improving heat transfer effect of heat transfer chain in water heater |
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