CN209310292U - 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
- Publication number
- CN209310292U CN209310292U CN201821873461.XU CN201821873461U CN209310292U CN 209310292 U CN209310292 U CN 209310292U CN 201821873461 U CN201821873461 U CN 201821873461U CN 209310292 U CN209310292 U CN 209310292U
- Authority
- CN
- China
- Prior art keywords
- reflection film
- collecting
- interior
- infrared reflection
- 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.)
- Active
Links
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/40—Solar thermal energy, e.g. solar towers
- Y02E10/47—Mountings or tracking
Landscapes
- Photovoltaic Devices (AREA)
Abstract
The utility model 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 utility model 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 utility model belongs to solar energy heat utilization technical field, is related to solar collection element, and in particular to be used for
The high-temperature vacuum heat-collecting tube of slot light collection collecting system.
Background technique
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.
Utility model content
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 utility model proposes a kind of outer glass pipes
Plate the high-temperature vacuum heat-collecting tube of infrared reflection film.
A kind of high-temperature vacuum heat-collecting tube for slot light collection collecting system includes interior absorption tube 2 and outer glass pipe 3, outer glass
Cavity between glass pipe 3 and interior absorption tube 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 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；
The technical solution further limited is as follows:
The interior infrared reflection film 41 and outer infrared reflection film 42 are the solar transmittance height at 0.2~2.5 μm
It is higher than 60% in 60%, in 2.5 μm or more of infrared band reflectivity.
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 the utility model high-temperature vacuum heat-collecting tube, effectively
Prevent interior absorption tube 2 that heat loss is gone out by thermal convection and thermal conductivity mode, so the main heat waste mode of thermal-collecting tube is spoke
Penetrate heat dissipation.The radiation heat loss of high-temperature vacuum heat-collecting tube mainly inhales with heat-collecting temperature and 2 outer surface solar selectively of interior absorption tube
It is related to receive coatings emissivity.As heat-collecting temperature increases, the external transmission power grow exponentially of interior absorption tube 2, while too
Positive energy coating for selective absorption emissivity can also sharply increase, and losing which results in the radiations heat energy of high-temperature vacuum heat-collecting tube can be anxious
Increase severely and adds.As shown in Fig. 2, high-temperature vacuum heat-collecting tube bottom reception comes from bottom reflection in groove type solar light and heat collection system
The sunray for the high heat flux density that mirror focuses, the upper area of evacuated collector tube face solar incident ray are only received from too
The low-heat current density direct solar radiation of sun；But with the promotion of evacuated collector tube heat-collecting temperature, evacuated collector tube is circumferential to external radiation
The exponential increase of heat waste amount, this make evacuated collector tube upper area will appear radiation heat loss amount be higher than its absorbed too
Positive irradiation energy causes the region to bear to obtain heat only.With the highest EuroTrough 150 of current commercialization degree and famous
For the PTR70 thermal-collecting tube of Schott AG, Germany, thermal-collecting tube manufacturing firm, focusing ratio (sun spoke that evacuated collector tube circumferentially receives
According to can flowqIt is irradiated with direct sunlightG bThe ratio between,q/G b) as shown in Figure 3.The optically focused for being 90-270 ° in thermal-collecting tube lower part central angle
Part is the main source that thermal-collecting tube obtains heat；It is 0-90 °, 270-360 ° of section, focusing ratio in thermal-collecting tube top central angle
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 it on thermal-collecting tube
The solar irradiation being absorbed into.To be effectively improved the region heat waste amount, we have proposed the interior tables in thermal-collecting tube outer glass pipe 3
Face, outer surface are coated with infrared reflection coating respectively.Although infrared reflection coating makes part solar radiation on outer glass pipe 3 penetrate drop
It is low, but they have effectively intercepted the infrared emanation of interior absorption tube transmitting and have reduced the external radiant heat of outer glass pipe
Damage.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, has very
Good value for applications.
The advantageous effects of the utility model embody in the following areas:
1. can effectively stop interior suction by optimizing and adding infrared reflection film to outer glass pipe top half inner surface
The infrared emanation based on infrared band of closed tube surface emitting, and infrared emanation is reflected back interior absorption tube surface, greatly
Reduce to amplitude the thermal loss of evacuated collector tube.
2. by optimizing and adding infrared reflection film to outer glass pipe top half outer surface, due to infrared reflection film
Has infrared band low-launch-rate characteristic, glass tube exterior surface radiates significantly compared to traditional outer glass pipe surface to environmental radiation
It reduces, 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 high-temperature vacuum heat-collecting tube heat waste amount described in utility model is only 195.7 W/m2, heat waste amount relative reduction reaches 14.9%.
Correspondingly, 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 can be opposite
Promote 6%.Mainstream evacuated collector tube performance on the far super Vehicles Collected from Market of the utility model performance.
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 utility model 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 absorption tube 2 and outer glass
Glass pipe 3.Gap between interior absorption tube 2 and outer glass pipe 3 is vacuum annular space 5.3 face solar incident ray of outer glass pipe
The inner surface of top half 4, outer surface be coated with interior infrared reflection film 41 and outer infrared reflection film 42 to reduce vacuum heat-collecting
Pipe radiation heat loss.
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 is mutually all transparent conductive oxide film with outer 42 material of infrared reflection film, specifically to mix
Tin indium oxide (ln2O3: Sn) for, performance verification is carried out to high-temperature vacuum heat-collecting tube 6.Tin-doped indium oxide film is in solar radiation
Wave band transmitance is 70%, and infrared band reflectivity is 60%-80%.As described above, through calculating, compared to tradition without
The solar vacuum heat-collecting pipe of transformation uses the new high-temperature vacuum heat-collecting tube of both film layers can when heat-collecting temperature is 400 degree
Effectively reduce 14.9% thermal loss；800 W/m are irradiated in direct sunlight2Under the conditions of, it opposite can improve 3% or so collection thermal effect
Rate.
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.Copper film
With a thickness of 10 nm, be 40% in solar radiation wave band transmitance, infrared band reflectivity is 90%；In thermal-collecting tube heat-collecting temperature
For 400 DEG C and 800 W/m of solar irradiation2Under the conditions of, heat waste is opposite can to reduce by 16.8%, and it is left that collecting efficiency opposite can promote 2.4%
It is right.Therefore, the method that infrared reflection film is added using outer glass pipe, which improves 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 pipe (3),
Cavity between outer glass pipe (3) and interior absorption tube (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 slot light collection collecting 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 slot light collection collecting 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 slot light collection collecting 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 |
|---|---|---|---|
| CN201821873461.XU CN209310292U (en) | 2018-11-14 | 2018-11-14 | A kind of high-temperature vacuum heat-collecting tube for slot light collection collecting system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821873461.XU CN209310292U (en) | 2018-11-14 | 2018-11-14 | A kind of high-temperature vacuum heat-collecting tube for slot light collection collecting system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN209310292U true CN209310292U (en) | 2019-08-27 |
Family
ID=67673109
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201821873461.XU Active CN209310292U (en) | 2018-11-14 | 2018-11-14 | A kind of high-temperature vacuum heat-collecting tube for slot light collection collecting system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN209310292U (en) |
Cited By (1)
| 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 |
-
2018
- 2018-11-14 CN CN201821873461.XU patent/CN209310292U/en active Active
Cited By (1)
| 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 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN1773190B (en) | Solar energy thermoelectric co-supply system | |
| CN203286155U (en) | Glass pipe, heat absorption pipe and parabolic trough collector | |
| CN101806502B (en) | Solar energy collecting system of heliostat | |
| CN205079478U (en) | Slot type solar energy spotlight solar collecting system | |
| CN104456980A (en) | Secondary concentrated reflection-transmission type parabolic-trough type solar heat collector | |
| CN101697032B (en) | Compound paraboloid condenser | |
| CN105157257A (en) | Slot type light gathering type solar vacuum heat collecting pipe | |
| CN107166755A (en) | Secondary condensation face strengthens fresnel reflecting mirror line-focusing solar collection device | |
| CN201594157U (en) | Composite parabolic condenser | |
| CN109297203A (en) | A kind of high-temperature vacuum heat-collecting tube for slot light collection collecting system | |
| CN209310292U (en) | A kind of high-temperature vacuum heat-collecting tube for slot light collection collecting system | |
| CN107166760A (en) | Secondary condensation face strengthens parabolic mirror line-focusing solar collection device | |
| CN101169286A (en) | Reflection type straightforward focusing high temperature solar energy heat collector | |
| CN105042885A (en) | Concentrating type flat-plate solar collector | |
| CN103185405A (en) | Vacuum glass assembly with condensing lens array | |
| CN101893325A (en) | Light-concentrating type high-efficient flat-plate compound heat collector | |
| CN106766275B (en) | A kind of groove type solar high-temperature vacuum heat-collecting tube | |
| CN208365843U (en) | A kind of equal receptions escape half-angle solar light-condensing and heat-collecting device | |
| CN202562086U (en) | Tank type solar optothermal photoelectric converter | |
| CN205037606U (en) | Slot type spotlight type solar vacuum heat collection tube | |
| CN106549632B (en) | A kind of folding photovoltaic and photothermal suitching type beam condensing unit of minute surface | |
| CN101240945A (en) | Self-focusing type straight-through vacuum heat collection device | |
| CN108645056A (en) | A kind of equal receptions escape half-angle solar light-condensing and heat-collecting device | |
| CN204421389U (en) | A kind of secondary condensation reflective-transmissive type parabolic trough type solar thermal collector | |
| CN208431964U (en) | A kind of groove type solar thermal-collecting tube for high temperature |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |