CN109297203A - A kind of high-temperature vacuum heat-collecting tube for slot light collection collecting system - Google Patents
A kind of high-temperature vacuum heat-collecting tube for slot light collection collecting system Download PDFInfo
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- CN109297203A CN109297203A CN201811352975.5A CN201811352975A CN109297203A CN 109297203 A CN109297203 A CN 109297203A CN 201811352975 A CN201811352975 A CN 201811352975A CN 109297203 A CN109297203 A CN 109297203A
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- infrared reflection
- tube
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- 239000011521 glass Substances 0.000 claims abstract description 34
- 230000005855 radiation Effects 0.000 claims abstract description 21
- 239000000463 material Substances 0.000 claims abstract description 10
- 238000002834 transmittance Methods 0.000 claims abstract description 5
- 238000010521 absorption reaction Methods 0.000 claims description 19
- 238000010248 power generation Methods 0.000 claims description 5
- 238000002310 reflectometry Methods 0.000 claims description 5
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 4
- 229910052802 copper Inorganic materials 0.000 claims description 4
- 239000010949 copper Substances 0.000 claims description 4
- 239000002699 waste material Substances 0.000 description 16
- 239000011248 coating agent Substances 0.000 description 7
- 238000000576 coating method Methods 0.000 description 7
- 238000000034 method Methods 0.000 description 6
- 230000000694 effects Effects 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 2
- 239000000306 component Substances 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 229910003437 indium oxide Inorganic materials 0.000 description 2
- PJXISJQVUVHSOJ-UHFFFAOYSA-N indium(iii) oxide Chemical compound [O-2].[O-2].[O-2].[In+3].[In+3] PJXISJQVUVHSOJ-UHFFFAOYSA-N 0.000 description 2
- 238000005457 optimization Methods 0.000 description 2
- 241000127225 Enceliopsis nudicaulis Species 0.000 description 1
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 239000008358 core component Substances 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 230000004907 flux Effects 0.000 description 1
- 238000011835 investigation Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 238000007747 plating Methods 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 229910052709 silver Inorganic materials 0.000 description 1
- 239000004332 silver Substances 0.000 description 1
- 238000012795 verification Methods 0.000 description 1
Classifications
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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
- Y02E10/47—Mountings or tracking
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- Photovoltaic Devices (AREA)
Abstract
The present invention relates to a kind of high-temperature vacuum heat-collecting tubes for slot light collection collecting system, including outer glass pipe and interior absorbing pipe, and the gap between outer glass pipe and interior absorbing pipe is vacuum annular space.The inner surface of the top half of outer glass pipe face solar incident ray, outer surface are coated with interior infrared reflection film, outer infrared reflection film respectively.Interior infrared reflection film is identical with outer infrared-reflection film materials, has in infrared band high reflectance, solar radiation wave band high transmittance characteristic.The present invention can effectively reduce the external thermal loss of high-temperature vacuum heat-collecting tube under the conditions of high-temperature heat-gathering, greatly improve evacuated collector tube collecting efficiency.
Description
Technical field
The invention belongs to solar energy heat utilization technical fields, are related to solar collection element, and in particular to are used for slot type
The high-temperature vacuum heat-collecting tube of light and heat collection system.
Technical background
Solar groove type light and heat collection system is that current high temperature solar is the most mature using commercialization degree highest, technology
Heat collector, high-temperature vacuum heat-collecting tube is that slot light collection collecting system technology is most complicated, requires most stringent of core component,
Running temperature is up to 550 DEG C, is widely used in the photo-thermal such as trough photovoltaic power generation system field.
However, the high-temperature heat-collection pipe under hot operation is faced with a large amount of radiation heat loss of great problem-, this
Cause the decline of thermal-collecting tube collecting efficiency.Especially in solar parabolic through power generation system, evacuated collector tube heat-collecting temperature is more
It is that can achieve 550 DEG C, this makes heat collecting pipe heat waste amount is exponential increased dramatically, and further reduced solar energy high-temperature vacuum
Thermal-collecting tube collecting efficiency becomes slot light collection collecting system and obtains the big roadblock of higher heat-collecting temperature one.Therefore it reduces higher
Groove type solar high-temperature vacuum heat-collecting tube heat waste problem academic and commercial value with higher under heat-collecting temperature.
The heat waste reduction method of current vacuum thermal-collecting tube is mainly to pass through optimization, promote each critical component of evacuated collector tube
Material and coating performance reduce the heat waste of evacuated collector tube to promote evacuated collector tube comprehensive performance.Such as improve vacuum heat-collecting
The absorptivity of absorption tube surface solar selectively absorbing coating in managing, improves outer glass pipe solar irradiation transmitance etc..But with
The development of material technology, the critical component material property rising space of current vacuum thermal-collecting tube is very small, this causes to pass through
Traditional material improvement method is also extremely limited with the effect for reducing evacuated collector tube heat waste.
Applicant according to the optically focused characteristic of slot light collection collecting system, propose it is a kind of it is simpler, to effectively reduce high temperature true
The method of empty heat collecting pipe heat waste.
Summary of the invention
It is a large amount of under higher heat-collecting temperature in order to effectively cut down the high-temperature vacuum heat-collecting tube in slot light collection collecting system
External radiation heat loss effectively improves the collecting efficiency of high-temperature vacuum heat-collecting tube, and the invention proposes a kind of plating of outer glass pipe is red
The high-temperature vacuum heat-collecting tube of external reflectance film.
A kind of high-temperature vacuum heat-collecting tube for slot light collection collecting system includes interior absorption tube 2 and outer glass enclosure tube 3, outside
Cavity between glass enclosure tube 3 and interior absorbing pipe 2 is vacuum annular space 5, and improvement is:
The inner surface and the outer surface of the top half 4 of the 3 face solar incident ray of outer glass pipe is respectively equipped with interior infrared anti-
Penetrate film 41 and outer infrared reflection film 42；
The interior infrared reflection film 41 and outer infrared reflection film 42 all have high in infrared band high reflectance, solar radiation wave band
Light transmission rate；
The technical solution further limited is as follows:
The interior infrared reflection film 41 and outer infrared reflection film 42 are to be higher than in 0.2~2.5 μm of solar transmittance
60%, the infrared band reflectivity at 2.5 μm or more is higher than 60%.
The material of the infrared reflection film 41 and the material of outer infrared reflection film 42 are transparent conductive oxide film or silver
Film or copper film.
The interior infrared reflection film 41 interior absorption tube 2 corresponding with 3 range of outer glass pipe that outer infrared reflection film 42 covers
Central angle be 180 degree.
It is vacuum annular space between the interior absorption tube 2 and outer glass pipe 3 of high-temperature vacuum heat-collecting tube of the present invention, effectively prevents
Interior absorption tube 2 is gone out heat loss by thermal convection and thermal conductivity mode, so thermal-collecting tube main heat waste mode is that radiation dissipates
Heat.The radiation heat loss of high-temperature vacuum heat-collecting tube, which mainly absorbs with heat-collecting temperature and 2 outer surface solar selectively of interior absorption tube, to be applied
Layer emissivity is related.As heat-collecting temperature increases, the external transmission power grow exponentially of interior absorption tube 2, while solar energy
Coating for selective absorption emissivity can also sharply increase, and which results in the losses of the radiations heat energy of high-temperature vacuum heat-collecting tube sharply to increase
Add.As shown in Fig. 2, high-temperature vacuum heat-collecting tube bottom reception is poly- from bottom mirror in groove type solar light and heat collection system
The sunray of burnt high heat flux density, the upper area of evacuated collector tube face solar incident ray are only received from the sun
Low-heat current density direct solar radiation；But with the promotion of evacuated collector tube heat-collecting temperature, the circumferentially external radiation heat loss of evacuated collector tube
Exponential increase is measured, this to will appear radiation heat loss's amount higher than the sun spoke that its is absorbed in evacuated collector tube upper area
According to energy, the region is caused to bear to obtain heat only.With the highest EuroTrough 150 of current commercialization degree and famous thermal-arrest
For the PTR70 thermal-collecting tube of Schott AG of Germany of pipe manufacturing firm, focusing ratio (solar irradiation energy that evacuated collector tube circumferentially receives
StreamqIt is irradiated with direct sunlightG bThe ratio between,q/G b) as shown in Figure 3.In the optically focused part that thermal-collecting tube lower part central angle is 90-270 °
It is the main source that thermal-collecting tube obtains heat；It is 0-90 °, 270-360 ° of section in thermal-collecting tube top central angle, focusing ratio is lower than
1, it is low to obtain heat.When heat-collecting temperature is higher, the interior external radiations heat energy in absorption tube surface of part is higher than its absorption on thermal-collecting tube
The solar irradiation arrived.To be effectively improved the region heat waste amount, we have proposed the inner surfaces, outer in thermal-collecting tube outer glass pipe 3
Surface is coated with infrared reflection coating respectively.Although infrared reflection coating makes part solar radiation on outer glass pipe 3 penetrate reduction,
They have effectively intercepted the infrared emanation of interior absorption tube transmitting and have reduced the external radiation heat loss of outer glass pipe.It is comprehensive
Pros and cons, radiation loss is big in the case of this method efficiently solves the problems, such as solar energy vacuum tube high temperature, and have makes well
With and promotional value.
Advantageous effects of the invention embody in the following areas:
1. can effectively stop interior absorption tube by optimizing and adding infrared reflection film to outer glass pipe top half inner surface
The infrared emanation based on infrared band of surface emitting, and infrared emanation is reflected back interior absorption tube surface, significantly
Ground reduces the thermal loss of evacuated collector tube；
2. by optimizing and adding infrared reflection film to outer glass pipe top half outer surface, since infrared reflection film has
Infrared band low-launch-rate characteristic, glass tube exterior surface radiate to environmental radiation and drop significantly compared to traditional outer glass pipe surface
Low, this effectively further reduces heat collecting pipe heat waste.
3. coating is optimized and adds in outer glass pipe top half inner and outer surfaces, to reduce heat collecting pipe heat waste
A kind of new method, new approaches, researching value with higher and practical value are researched and proposed.
4., when heat-collecting temperature is 400 DEG C, traditional vacuum heat collecting pipe heat waste amount is 230 W/m by calculating discovery2, this
A kind of invention high-temperature vacuum heat-collecting tube heat waste amount is only 195.7 W/m2, heat waste amount relative reduction reaches 14.9%.Accordingly
Ground, the opposite promotion 3% or so that evacuated collector tube collecting efficiency can be breakthrough, slot type photo-thermal power station annual electricity generating capacity opposite can be promoted
6%.Inventive can mainstream evacuated collector tube performance on far super Vehicles Collected from Market.
Detailed description of the invention
Fig. 1 is that the high-temperature vacuum heat-collecting tube of outer glass pipe film layer optimization is assemblied in cross in solar groove type light and heat collection system
Schematic cross-section.
Fig. 2 is slot light collection collecting system ray trace schematic diagram.
Fig. 3 is the PTR70 thermal-collecting tube circumferential direction focusing ratio figure being assemblied on 150 condenser groove of EuroTrough.
Serial number in upper figure: slot light collection reflector 1, interior absorption tube 2, outer glass pipe 3, top half 4, interior infrared reflection film
41, outer infrared reflection film 42, vacuum annular space 5, high-temperature vacuum heat-collecting tube 6.
Specific embodiment
With reference to the accompanying drawing, the present invention is further described by embodiment.
Embodiment 1
Referring to Fig. 1, a kind of high-temperature vacuum heat-collecting tube 6 for slot light collection collecting system includes interior absorbing pipe 2 and outer glass pipe
3.Gap between interior absorbing pipe 2 and outer glass pipe 3 is vacuum annular space 5.3 face solar incident ray of outer glass pipe it is upper
The inner surface of half part 4, outer surface are coated with interior infrared reflection film 41 and outer infrared reflection film 42 to reduce evacuated collector tube spoke
Penetrate heat waste.
Interior infrared reflection film 41 and outer infrared reflection film 42 are higher than in the solar transmittance at 0.2~2.5 μm
60%, the infrared band reflectivity at 2.5 μm or more is higher than 60%.
Elevation angle of the sun within the scope of one day constantly changes, and trench light condensing system generally uses one-dimensional tracking mode to track
Sun rotation is to obtain maximum Heat-collecting effect.Referring to Fig. 1, slot light collection reflector 1 and high-temperature vacuum heat-collecting tube 6 are mounted on one
Play the rotation tracking sun, therefore the 4 face sun of top half and sky of outer glass pipe 3 and only reception direct sunlight irradiation.Outside
The lower half portion of glass tube 3 then receives the high power solar irradiation focused from the reflection of bottom slot type investigation on several focus reflectors 1, and the part
High power solar irradiation is the main source that high-temperature vacuum heat-collecting tube 6 obtains heat.It is interior red in order not to block the optically focused light of bottom
External reflectance film 41 and outer infrared reflection film 42 only cover the top half 4 of outer glass pipe 3, that is, 3 model of outer glass pipe covered
Enclose the 180 degree of corresponding 2 central angle of interior absorption tube.
Interior infrared reflection film 41 can effectively stop the infrared hot spoke based on infrared band of interior 2 surface emitting of absorption tube
It penetrates, and infrared emanation is reflected back interior 2 surface of absorption tube, the radiation heat loss of high-temperature vacuum heat-collecting tube 6 is greatly reduced；
Simultaneously because outer infrared reflection film 42 has low-launch-rate characteristic, outer infrared reflection film 42 radiates compared to tradition to environmental radiation
Outer glass pipe surface substantially reduces, this effectively further reduces the heat waste of high-temperature vacuum heat-collecting tube 6.Therefore, by external
4 the inner surface and the outer surface of top half of glass tube 3, which optimizes, adds infrared reflection coating, can effectively reduce high-temperature vacuum collection
The external radiation heat loss of heat pipe 6, greatly improves the collecting efficiency of high-temperature vacuum heat-collecting tube 6；Interior infrared reflection film 41 and outer infrared anti-
Penetrating 42 material of film is mutually all transparent conductive oxide film, specifically with tin-doped indium oxide (ln2O3: Sn) for, to high-temperature vacuum collection
Heat pipe 6 carries out performance verification.Tin-doped indium oxide film is 70% in solar radiation wave band transmitance, and infrared band reflectivity is
60%-80%.As described above, by calculating, compared to the not modified solar vacuum heat-collecting pipe of tradition, using both
The new high-temperature vacuum heat-collecting tube of film layer can effectively reduce 14.9% thermal loss when heat-collecting temperature is 400 degree；In direct sunlight
Irradiate 800 W/m2Under the conditions of, it opposite can improve 3% or so collecting efficiency.
It is referring to fig. 2 slot light collection collecting system ray trace schematic diagram, base channel is passed through in the direct projection irradiation from the sun
Formula reflecting mirror 1 focuses on the high-temperature vacuum heat-collecting tube 6 of reflection groove focal point.It focuses light and is concentrated mainly on high-temperature vacuum thermal-arrest
The lower part of pipe 6, and 6 top of high-temperature vacuum heat-collecting tube only receives the irradiation of the direct projection from the sun.
Referring to Fig. 3, for selecting 150 condenser groove of EuroTrough and PTR70 thermal-collecting tube, to high-temperature vacuum heat-collecting tube week
It is analyzed to hot-fluid.In the lower part (central angle θ range is 90-270 °) of high-temperature vacuum heat-collecting tube, what is received is high-energy
Solar irradiation (the focusing ratio of densityq/G bHigher than 1), and part on high-temperature vacuum heat-collecting tube (central angle θ range is 0-90 °,
270-360 °) only receive low energy densities direct sunlight irradiation (focusing ratioq/G bLower than 1).
Embodiment 2
Interior infrared reflection film 41 is mutually all copper film with outer 42 material of infrared reflection film.Other structures are the same as embodiment 1.The thickness of copper film
Degree is 10 nm, is 40% in solar radiation wave band transmitance, infrared band reflectivity is 90%；It is 400 in thermal-collecting tube heat-collecting temperature
DEG C and 800 W/m of solar irradiation2Under the conditions of, heat waste is opposite can to reduce by 16.8%, and collecting efficiency opposite can promote 2.4% or so.Cause
This, being improved using the method that outer glass pipe adds infrared reflection film to evacuated collector tube hot property has breakthrough value.
Claims (4)
1. a kind of high-temperature vacuum heat-collecting tube for slot light collection collecting system, including interior absorption tube (2) and outer glass enclosure tube
(3), the cavity between outer glass enclosure tube (3) and interior absorbing pipe (2) is vacuum annular space (5), it is characterised in that:
The inner surface and the outer surface of the top half (4) of outer glass pipe (3) the face solar incident ray is respectively equipped with interior red
External reflectance film (41) and outer infrared reflection film (42)；
The interior infrared reflection film (41) and outer infrared reflection film (42) all have in infrared band high reflectance, solar radiation wave
Section high transmittance characteristic.
2. a kind of high-temperature vacuum heat-collecting tube for solar parabolic through power generation system according to claim 1, it is characterised in that:
The interior infrared reflection film (41) and outer infrared reflection film (42) are to be higher than in 0.2~2.5 μm of solar transmittance
60%, the infrared band reflectivity at 2.5 μm or more is higher than 60%.
3. a kind of high-temperature vacuum heat-collecting tube for solar parabolic through power generation system according to claim 1 or 2, feature exist
In: the material of the interior infrared reflection film (41) and outer infrared reflection film (42) is transparent conductive oxide film or silverskin or copper
Film.
4. a kind of high-temperature vacuum heat-collecting tube for solar parabolic through power generation system according to claim 1, it is characterised in that:
The corresponding interior absorption tube of range of the outer glass pipe (3) of the interior infrared reflection film (41) and outer infrared reflection film (42) covering
(2) central angle is 180 degree.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811352975.5A CN109297203A (en) | 2018-11-14 | 2018-11-14 | A kind of high-temperature vacuum heat-collecting tube for slot light collection collecting system |
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| CN201811352975.5A CN109297203A (en) | 2018-11-14 | 2018-11-14 | A kind of high-temperature vacuum heat-collecting tube for slot light collection collecting system |
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| CN109297203A true CN109297203A (en) | 2019-02-01 |
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| CN201811352975.5A Pending CN109297203A (en) | 2018-11-14 | 2018-11-14 | A kind of high-temperature vacuum heat-collecting tube for slot light collection collecting system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110777326A (en) * | 2019-05-14 | 2020-02-11 | 淮安亮谷光电科技有限公司 | Preparation method of semi-gold-plated high-reflection infrared heating hollow pipe |
| CN115521082A (en) * | 2022-10-11 | 2022-12-27 | 华润水泥技术研发有限公司 | Method for promoting light calcium digestion process by improving digestion temperature through photo-thermal technology |
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| JP2014062653A (en) * | 2012-09-20 | 2014-04-10 | Ikebukuro Horo Kogyo Kk | Glass lining heat collecting structure |
| CN104748417A (en) * | 2015-03-28 | 2015-07-01 | 顾钰锋 | Solar anti-explosion heat collecting pipe |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110777326A (en) * | 2019-05-14 | 2020-02-11 | 淮安亮谷光电科技有限公司 | Preparation method of semi-gold-plated high-reflection infrared heating hollow pipe |
| CN110777326B (en) * | 2019-05-14 | 2022-01-14 | 淮安亮谷光电科技有限公司 | Preparation method of semi-gold-plated high-reflection infrared heating hollow pipe |
| CN115521082A (en) * | 2022-10-11 | 2022-12-27 | 华润水泥技术研发有限公司 | Method for promoting light calcium digestion process by improving digestion temperature through photo-thermal technology |
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