CN104075472A - Moderate temperature straight all-glass vacuum heat collecting tube - Google Patents
Moderate temperature straight all-glass vacuum heat collecting tube Download PDFInfo
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- CN104075472A CN104075472A CN201410348597.9A CN201410348597A CN104075472A CN 104075472 A CN104075472 A CN 104075472A CN 201410348597 A CN201410348597 A CN 201410348597A CN 104075472 A CN104075472 A CN 104075472A
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- glass
- tube
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- expansion joint
- corrugated
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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
-
- 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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P80/00—Climate change mitigation technologies for sector-wide applications
- Y02P80/20—Climate change mitigation technologies for sector-wide applications using renewable energy
Abstract
The invention relates to a moderate temperature straight all-glass vacuum heat collecting tube which comprises a glass outer tube (1), a glass inner tube (2), a first bellows expansion joint (3(A)), a second bellows expansion joint (3(B)), a first metal connecting tube (9(A)) and a second metal connecting tube (9(B)), wherein one end of the glass outer tube (1) is in sealing connection with one end of the first bellows expansion joint (3(A)) via a first transition connecting ring (6(A)); the other end of the glass outer tube (1) is in sealing connection with one end of the second bellows expansion joint (3(B)) via a second transition connecting ring (6(B)); the other ends of the bellows expansion joints are in sealing connection with the two ends of the glass inner tube (2) via transition connecting rings; and the first metal connecting tube (9(A)) and the second metal connecting tube (9(B)) are welded at outer side orifices of the first bellows expansion joint (3(A)) and the second bellows expansion joint (3(B)) respectively. The tube is lower in cost and sealing connection difficulty, and is applicable to solar moderate temperature heat utilization systems of industrial heating, heat energy refrigeration and the like.
Description
Technical field
The present invention relates to warm straight through type all glass vacuum thermal-collecting tube in, for solar energy temperature collecting system, belong to solar energy utilization technique field.
Background technology
In solar energy, high temperature heat utilization technology comprises industrial heat, air conditioner refrigerating and solar energy thermal-power-generating etc., is study hotspot.Groove type heat collector is the highest solar energy medium-temperature collectors of current commercialization degree.Through type metal-glass vaccum heat-collecting tube, as the assembly of realizing photo-thermal conversion, is the core component of current groove type heat collector.Business-like through type metal-glass vaccum heat-collecting tube has the UVAC thermal-collecting tube of Siemens Company's production and the PTR thermal-collecting tube that Schott AG produces, its metal-glass sealing difficulty is larger, sealing-in key technology is abroad monopolized, and to domestic implementation blockade on new techniques, thermal-collecting tube cost is higher.The swell increment difference of metal tube and glass tube is the main cause that causes heat-collecting tube sealing to lose efficacy.Domestic through type metal-glass vaccum heat-collecting tube is still in the imitated stage, large-scale application not, and Key Performance Indicator also lags behind abroad.Exploitation is applicable to the high efficiency of warm heat utilization system in solar energy, novel straight-through heat collection pipe is significant cheaply.
The patent No. is that the Chinese utility model patent of ZL99221202.2 and ZL200520133468.4 has all been invented a kind of through type glass vacuum heat collection tube of solar energy that is applicable to solar water heater, adopt type metal expansion joint to be placed in the straight length of inner glass tube and outer glass pipe, absorb because being subject to thermogenetic thermal expansion, with respect to traditional U-shaped all-glass vacuum thermal-collecting tube, this thermal-collecting tube has improved the type of flow in pipe, has strengthened Heat-collecting effect.But because its two ends mouth of pipe is glass structure, cannot effectively connect, for scale temperature collecting system.
Application number is to disclose a kind of straight through type all glass vacuum heat collection tube of solar energy in 200810019640.1 Chinese invention patent, and two ends adopt U-shaped telescopic joint from radially eliminating the swell increment of inside and outside glass tube.But this thermal-collecting tube is only for CPC (the Compound Parabolic Concentrator) condenser system of optically focused in low power, heat-collecting temperature is lower; Meanwhile, at vacuum interlayer, the heat loss that CPC has increased thermal-collecting tube is set.
The king of Shanghai Communications University is if bamboo etc. is at " Performance investigation on a novel single-pass evacuated tube with a symmetrical compound parabolic concentrator " (Solar Energy, 2013,98:275-289) a kind of straight through type all glass vacuum thermal-collecting tube has been proposed in a literary composition.Outer tube is the glass tube (expansion joint) with a plurality of waveform configurations, for compensating inner and outer pipes swell increment difference.Because glass toughness is poor, this corrugated glass structure can not the larger swell increment difference of effective compensation, and operating temperature is lower than 100 ℃.In addition, this thermal-collecting tube two ends mouth of pipe is similarly glass sealing structure, is not easy to serial connection.
Summary of the invention
The object of the invention is to overcome the limitation of existing through type metal-glass vaccum heat-collecting tube and straight through type all glass vacuum thermal-collecting tube, in solar energy temperature (100～300 ℃) collecting system provide a kind of high efficiency, cheaply in warm straight through type all glass vacuum thermal-collecting tube.
Technical scheme of the present invention is: a kind of middle temperature straight through type all glass vacuum thermal-collecting tube, consists of glass outer tube 1, glass inner tube 2, the first corrugated-type expansion joint 3 (A), the second corrugated-type expansion joint 3 (B), the first metal connecting tube 9 (A) and the second metal connecting tube 9 (B); Between glass outer tube 1 and glass inner tube 2, be vacuum space 4, glass inner tube 2 outer surfaces are coated with the coating for selective absorption 8 of high-absorbility low-launch-rate; Glass inner tube 2 outer surface one sides are posted getter 5 near end position; Glass outer tube 1 one end is one end sealing-in with the first corrugated-type expansion joint 3 (A) by First Transition coupling ring 6 (A), and the other end is one end sealing-in with the second corrugated-type expansion joint 3 (B) by the second transition coupling ring 6 (B); The other end of the first corrugated-type expansion joint 3 (A) and the second corrugated-type expansion joint 3 (B) is respectively by the two ends sealing-in of the 3rd transition coupling ring 7 (A) and the 4th transition coupling ring 7 (B) and glass inner tube 2; The first metal connecting tube 9 (A) and the second metal connecting tube 9 (B) are welded in respectively the outside mouth of pipe of the first corrugated-type expansion joint 3 (A) and the second corrugated-type expansion joint 3 (B).
Preferably above-mentioned glass outer tube 1 and the material of glass inner tube 2 are Pyrex; Preferred glass inner tube 2 diameter ranges are 30～70mm, and length is 1～4m; Glass outer tube 1 diameter is than the large 10～30mm of glass inner tube 2.
Preferably the material of above-mentioned corrugated-type expansion joint is stainless steel; It is external or built-in that corrugated-type expansion joint connects form with the sealing-in of glass outer tube and glass inner tube; External, is arranged on glass outer tube 1 outside; Built-in, be arranged on glass outer tube 1 the inside.
The wave-number range of preferred wave shape form expansion joint is 1～10, and waveform is U-shaped or Ω type.Described transition coupling ring is stainless steel or expansion alloy, and the coefficient of expansion of material is 3 * 10
-6～12 * 10
-6m/ (m ℃); When more preferably described expansion alloy is Fe-Co-Ni kovar alloy, in 25～400 ℃ of temperature ranges, the coefficient of expansion is 4 * 10
-6～6 * 10
-6m/ (m ℃).
The sealing-in mode of described glass outer tube and glass inner tube and corrugated-type expansion joint and transition coupling ring adopts high-frequency electromagnetic induction sealing by fusing, hot pressing envelope or scolder welding procedure.
Preferably the vacuum of above-mentioned vacuum space 4 is 5 * 10
-5～0.05Pa.
Preferably the absorptivity of the coating for selective absorption 8 of above-mentioned high-absorbility low-launch-rate is 86%～96%, and emissivity is 4%～14%.
Described getter 5 is evaporable air-absorbing agent, and its material is barium aluminium nickel or barium titanium, is shaped as dish shape, band shape, ring-type or cup-shaped.
Described metal connecting tube 9 is stainless steel and other metal materials, when warm straight through type all glass vacuum thermal-collecting tube connects in many, can directly weld or connect by welded flange in metal connecting tube 9.
Described middle temperature straight through type all glass vacuum thermal-collecting tube, is applicable to the light and heat collection system of slot type, composite parabolic formula and Fresnel.
According to data well known in the art, the middle temperature straight through type all glass vacuum pipe heat collector that every form is similar to the present invention with material, do not have material alterations, all drops in protection scope of the present invention.
Beneficial effect:
(1) glass outer tube of the present invention and glass inner tube material are all glass, and the collecting efficiency of thermal-collecting tube is 65%～85%; Compare with through type metal-glass vaccum heat-collecting tube, during 100～300 ℃ of operating temperatures, thermal stress reduces by 50%～80%, thereby reduces sealing-in difficulty and crash rate, improves the reliability that thermal-collecting tube is worked under mesophilic condition.
(2) outer tube of the present invention and inner tube adopt glass material, and not only material cost is lower; Meanwhile, sealing-in difficulty reduces, and process costs reduces.
(3) two ends of the present invention are reserved with metallic welded tubes, conveniently realize a plurality of thermal-collecting tubes and connect, and obtain higher heat-collecting temperature, are applicable to warm heat utilization system in the solar energy such as industrial heat and thermal refrigerating.
Accompanying drawing explanation
Fig. 1 when adopting U-shaped expansion joint external in the structural representation of warm straight through type all glass vacuum thermal-collecting tube;
Wherein, 1-glass outer tube; 2-glass inner tube; 3 (A)-first corrugated-type expansion joints; 3 (B)-second corrugated-type expansion joints; 4-vacuum space; 5-getter; 6 (A)-First Transition coupling rings; 6 (B)-second transition coupling rings; 7 (A)-the 3rd transition coupling ring; 7 (B)-the 4th transition coupling ring; 8-coating for selective absorption; 9 (A)-first metal connecting tubes; 9 (B)-second metal connecting tubes.
Fig. 2 is the partial view that while adopting U-shaped expansion joint external, glass outer tube is connected with glass inner tube;
Fig. 3 is the structural representation of through type double-glass vacuum heat-collecting tube while adopting U-shaped interior expansion joint built-in;
Fig. 4 is the partial view that while adopting U-shaped interior expansion joint built-in, glass outer tube is connected with glass inner tube.
The specific embodiment
Embodiment 1
As shown in Figure 1, the invention discloses a kind of middle temperature straight through type all glass vacuum thermal-collecting tube, by glass outer tube 1, glass inner tube 2, corrugated-type expansion joint 3 and metal connecting tube 9, formed; Between glass outer tube 1 and glass inner tube 2, be vacuum space 4, glass inner tube 2 outer surfaces are coated with the coating for selective absorption 8 of high-absorbility low-launch-rate; Glass inner tube 2 outer surface one sides are posted getter 5 near end position; Glass outer tube 1 one end is one end sealing-in with the first corrugated-type expansion joint 3 (A) by First Transition coupling ring 6 (A), and the other end is one end sealing-in with the second corrugated-type expansion joint 3 (B) by the second transition coupling ring 6 (B); The other end of the first corrugated-type expansion joint 3 (A) and the second corrugated-type expansion joint 3 (B) is respectively by the two ends sealing-in of the 3rd transition coupling ring 7 (A) and the 4th transition coupling ring 7 (B) and glass inner tube 2; The first metal connecting tube 9 (A) and the second metal connecting tube 9 (B) are welded in respectively the outside mouth of pipe of the first corrugated-type expansion joint 3 (A) and the second corrugated-type expansion joint 3 (B); Expansion joint 3 adopts external, is placed in glass outer tube 1 outside; Glass inner tube 2 diameters are 70mm, and length is 1m; Glass outer tube 1 diameter is than the large 30mm of glass inner tube 2.The material of glass outer tube 1 and glass inner tube 2 is Pyrex 3.3.Corrugated-type expansion joint 3 is stainless steel, and waveform is U-shaped, and wave number is 10.The material of transition coupling ring I 6 and transition coupling ring II 7 is that the coefficient of expansion is 3 * 10
-6the Fe-Ni expansion alloy of m/ (m ℃), adopts hot-press sealing and sealing by fusing technique to carry out sealing-in with glass outer tube 1, glass inner tube 2 and corrugated-type expansion joint 3 respectively.The vacuum of vacuum space 4 is 0.05Pa, and the absorptivity of coating for selective absorption is 86%, and emissivity is 4%.Fig. 2 is the partial view that glass outer tube is connected with glass inner tube.
The present embodiment thermal-collecting tube is for Fresnel condenser system, and thermal-collecting tube collecting efficiency is 65%～75%, and heat-collecting temperature scope is 0～200 ℃; During 200 ℃ of operating temperatures, the thermal stress of thermal-collecting tube reduces by 50% left and right than through type metal-glass vaccum heat-collecting tube.
Embodiment 2
As shown in Figure 3, be another embodiment of the present invention, described corrugated-type expansion joint 3 is built-in, is placed in glass outer tube 1 the inside; Glass inner tube 2 diameters are 30mm, and length is 2m; Glass outer tube 1 diameter is than the large 10mm of glass inner tube 2; The material of glass outer tube 1 and glass inner tube 2 is Pyrex 5.0; Corrugated-type expansion joint 3 is stainless steel, and waveform is U-shaped, and wave number is 1; The material of transition coupling ring I 6 and transition coupling ring II 7 is that the coefficient of expansion is 4 * 10
-6the Fe-Ni-Co kovar alloy of m/ (m ℃), adopts sealing by fusing to connect and scolder welding procedure is carried out sealing-in with glass outer tube 1, glass inner tube 2 and corrugated-type expansion joint 3 respectively; The vacuum of vacuum space 4 is 0.01Pa; The absorptivity of coating for selective absorption is 96%, and emissivity is 14%.All the other versions are identical with embodiment 1.Fig. 4 is the partial view that interior expansion joint form glass outer tube is connected with glass inner tube.
The present embodiment thermal-collecting tube is for trench light condensing system, and collecting efficiency is 75%～85%, and heat-collecting temperature scope is 0～300 ℃; During 300 ℃ of operating temperatures, the thermal stress of thermal-collecting tube reduces by 80% left and right than through type metal-glass vaccum heat-collecting tube.
Embodiment 3
In another embodiment of the present invention, described corrugated-type expansion joint 3 is Ω type, and the outer length of tube of glass is 4m; The material of transition coupling ring I 6 and transition coupling ring II 7 is that the coefficient of expansion is 12 * 10
-6the stainless steel of m/ (m ℃); Adopt sealing by fusing connection and scolder welding procedure to carry out sealing-in with glass outer tube 1, glass inner tube 2 and corrugated-type expansion joint 3 respectively; The vacuum of vacuum space is 5 * 10
-5pa.All the other versions and parameter are identical with embodiment 1.
The present embodiment thermal-collecting tube is for composite parabolic condenser system, and thermal-collecting tube collecting efficiency reaches 65%～75%, and heat-collecting temperature scope is 0～150 ℃; During 150 ℃ of operating temperatures, the thermal stress of thermal-collecting tube reduces by 50% left and right than through type metal-glass vaccum heat-collecting tube.
Embodiment 4
In another embodiment of the present invention, described glass outer tube 1 length is 4m; Corrugated-type expansion joint wave number is 3; Described transition coupling ring I 6 and the material of transition coupling ring II 7 are that the coefficient of expansion is 6 * 10
-6the Fe-Ni-Co kovar alloy of m/ (m ℃), all the other versions and parameter are identical with embodiment 2.
The present embodiment thermal-collecting tube is for trench light condensing system, and collecting efficiency is 75%～85%, and heat-collecting temperature scope is 0～300 ℃; During 300 ℃ of operating temperatures, the thermal stress of thermal-collecting tube reduces by 80% left and right than through type metal-glass vaccum heat-collecting tube.
Claims (7)
1. a warm straight through type all glass vacuum thermal-collecting tube in, is characterized in that consisting of glass outer tube (1), glass inner tube (2), the first corrugated-type expansion joint (3 (A)), the second corrugated-type expansion joint (3 (B)), the first metal connecting tube (9 (A)) and the second metal connecting tube (9 (B)); Between glass outer tube (1) and glass inner tube (2), be vacuum space (4), glass inner tube (2) outer surface is coated with the coating for selective absorption (8) of high-absorbility low-launch-rate; Glass inner tube (2) outer surface one side is posted getter (5) near end position; Glass outer tube (1) one end is one end sealing-in with the first corrugated-type expansion joint (3 (A)) by First Transition coupling ring (6 (A)), and the other end is one end sealing-in with the second corrugated-type expansion joint (3 (B)) by the second transition coupling ring (6 (B)); The other end of the first corrugated-type expansion joint (3 (A)) and the second corrugated-type expansion joint (3 (B)) is respectively by the two ends sealing-in of the 3rd transition coupling ring (7 (A)) and the 4th transition coupling ring (7 (B)) and glass inner tube (2); The first metal connecting tube (9 (A)) and the second metal connecting tube (9 (B)) are welded in respectively the outside mouth of pipe of the first corrugated-type expansion joint (3 (A)) and the second corrugated-type expansion joint (3 (B)).
2. middle temperature straight through type all glass vacuum thermal-collecting tube according to claim 1, is characterized in that described glass outer tube (1) and the material of glass inner tube (2) are Pyrex; Described glass inner tube (2) diameter range is 30～70mm, and length is 1～4m; Described glass outer tube (1) diameter is than the large 10～30mm of glass inner tube (2).
3. middle temperature straight through type all glass vacuum thermal-collecting tube according to claim 1, is characterized in that described corrugated-type expansion joint material is stainless steel; Waveform is U-shaped or Ω type, and wave-number range is 1～10.
4. middle temperature straight through type all glass vacuum thermal-collecting tube according to claim 1, is characterized in that described transition coupling ring is stainless steel or expansion alloy; The coefficient of expansion of material is 3 * 10
-6～12 * 10
-6m/ (m ℃).
5. middle temperature straight through type all glass vacuum thermal-collecting tube according to claim 1, is characterized in that the vacuum of described vacuum space (4) is 5 * 10
-5～0.05Pa.
6. middle temperature straight through type all glass vacuum thermal-collecting tube according to claim 1, is characterized in that the absorptivity of described coating for selective absorption (8) is 86%～96%, and emissivity is 4%～14%.
7. middle temperature straight through type all glass vacuum thermal-collecting tube according to claim 1, is characterized in that it is external or built-in that corrugated-type expansion joint connects form with the sealing-in of glass outer tube (1) and glass inner tube (2).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410348597.9A CN104075472B (en) | 2014-07-21 | 2014-07-21 | Warm straight through type all glass vacuum thermal-collecting tube in one |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410348597.9A CN104075472B (en) | 2014-07-21 | 2014-07-21 | Warm straight through type all glass vacuum thermal-collecting tube in one |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104075472A true CN104075472A (en) | 2014-10-01 |
| CN104075472B CN104075472B (en) | 2016-04-13 |
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|---|---|---|---|
| CN201410348597.9A Active CN104075472B (en) | 2014-07-21 | 2014-07-21 | Warm straight through type all glass vacuum thermal-collecting tube in one |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105258362A (en) * | 2015-10-13 | 2016-01-20 | 北京有色金属研究总院 | Suction material holding support for solar energy medium-high temperature evacuated collector tube |
| CN106440406B (en) * | 2016-10-28 | 2018-07-17 | 东南大学 | A kind of solar vacuum heat-collecting pipe of double expansion joints |
| CN110044078A (en) * | 2019-05-29 | 2019-07-23 | 广州聚能太阳能科技有限公司 | A kind of new type solar collecting device |
| CN110470062A (en) * | 2019-09-12 | 2019-11-19 | 浙江科杰新材料有限公司 | A kind of solar vacuum heat-collecting pipe |
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| CN2861880Y (en) * | 2005-11-22 | 2007-01-24 | 江希年 | Glass vacuum solar heating collecting pipe |
| US20070034204A1 (en) * | 2005-05-09 | 2007-02-15 | Thomas Kuckelkorn | Tubular radiation absorbing device for solar heating applications |
| CN101256033A (en) * | 2008-03-11 | 2008-09-03 | 东南大学 | Straightthrough type double glazing vacuum solar heat collection tube |
| CN102519160A (en) * | 2011-12-27 | 2012-06-27 | 皇明太阳能股份有限公司 | Straight-through solar collector tube |
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Patent Citations (5)
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| CN2381964Y (en) * | 1999-06-10 | 2000-06-07 | 黄永年 | Straight throughing vacuum glass solar heat collector |
| US20070034204A1 (en) * | 2005-05-09 | 2007-02-15 | Thomas Kuckelkorn | Tubular radiation absorbing device for solar heating applications |
| CN2861880Y (en) * | 2005-11-22 | 2007-01-24 | 江希年 | Glass vacuum solar heating collecting pipe |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105258362A (en) * | 2015-10-13 | 2016-01-20 | 北京有色金属研究总院 | Suction material holding support for solar energy medium-high temperature evacuated collector tube |
| CN106440406B (en) * | 2016-10-28 | 2018-07-17 | 东南大学 | A kind of solar vacuum heat-collecting pipe of double expansion joints |
| CN110044078A (en) * | 2019-05-29 | 2019-07-23 | 广州聚能太阳能科技有限公司 | A kind of new type solar collecting device |
| CN110470062A (en) * | 2019-09-12 | 2019-11-19 | 浙江科杰新材料有限公司 | A kind of solar vacuum heat-collecting pipe |
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|---|---|
| CN104075472B (en) | 2016-04-13 |
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