WO2009000129A1 - Tube de récupération de chaleur sous vide solaire - Google Patents

Tube de récupération de chaleur sous vide solaire Download PDF

Info

Publication number
WO2009000129A1
WO2009000129A1 PCT/CN2007/070202 CN2007070202W WO2009000129A1 WO 2009000129 A1 WO2009000129 A1 WO 2009000129A1 CN 2007070202 W CN2007070202 W CN 2007070202W WO 2009000129 A1 WO2009000129 A1 WO 2009000129A1
Authority
WO
WIPO (PCT)
Prior art keywords
metal
tube
heat absorbing
metal heat
solar vacuum
Prior art date
Application number
PCT/CN2007/070202
Other languages
English (en)
Chinese (zh)
Inventor
Xinian Jiang
Hongchuan Ge
Hansan Gao
Xiaobo Zhou
Original Assignee
Beijing Eurocon Solar Energy Tech.Co., Ltd.
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Beijing Eurocon Solar Energy Tech.Co., Ltd. filed Critical Beijing Eurocon Solar Energy Tech.Co., Ltd.
Priority to PCT/CN2007/070202 priority Critical patent/WO2009000129A1/fr
Publication of WO2009000129A1 publication Critical patent/WO2009000129A1/fr

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24S—SOLAR HEAT COLLECTORS; SOLAR HEAT SYSTEMS
    • F24S10/00—Solar heat collectors using working fluids
    • F24S10/40—Solar heat collectors using working fluids in absorbing elements surrounded by transparent enclosures, e.g. evacuated solar collectors
    • F24S10/45—Solar heat collectors using working fluids in absorbing elements surrounded by transparent enclosures, e.g. evacuated solar collectors the enclosure being cylindrical
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24S—SOLAR HEAT COLLECTORS; SOLAR HEAT SYSTEMS
    • F24S10/00—Solar heat collectors using working fluids
    • F24S10/70—Solar heat collectors using working fluids the working fluids being conveyed through tubular absorbing conduits
    • F24S10/75—Solar heat collectors using working fluids the working fluids being conveyed through tubular absorbing conduits with enlarged surfaces, e.g. with protrusions or corrugations
    • 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

Definitions

  • the present invention relates to a heat collecting tube in the field of solar thermal utilization, and more particularly to a medium and high temperature solar vacuum heat collecting tube for a solar thermal power generation system.
  • the trough collector is one of the main methods of solar collectors for solar thermal power generation systems.
  • the trough type concentrating heat collecting device comprises a trough type parabolic concentrator, a receiver and a tracking mechanism, wherein the receiver is a key component for obtaining high temperature heat energy, generally a medium-high temperature (300-400 ° C) concentrating solar vacuum heat collecting tube Composition.
  • the conventional concentrating solar vacuum heat collecting tube is generally a two-head vacuum collecting tube.
  • the two-head vacuum collecting tube of the Chinese utility model patent patrol with the patent number 99230587, the solar energy of the Chinese utility model patent gong of the patent number 200420091 975.1 Vacuum collector tubes, etc.
  • the conventional solar vacuum heat collecting tube generally comprises a double-type metal tube coated with a heat absorbing film on the outer surface and a vacuum glass tube disposed outside the metal tube, the metal tube is disposed concentrically with the vacuum glass tube, wherein the metal tube is Both ends protrude from the outside of the glass tube and are sealed with the glass tube at the glass tube port.
  • the vacuum interlayer between the metal tube and the glass tube of the two-head vacuum heat collecting tube not only protects the coating on the surface of the metal tube, but also reduces the heat collecting loss, and has a better solar heat collecting effect.
  • the two-head vacuum heat collecting tube has the following defects in actual use:
  • the traditional two-head vacuum collector tube mainly collects heat through the heat absorbing coating on the outer surface of the metal tube.
  • the diameter of the heat collecting tube needs to be increased.
  • the increase in the diameter of the metal tube must increase the diameter of the sealing port, which leads to an increase in sealing difficulty, which is almost impossible to achieve.
  • the increase in heat collection efficiency is limited.
  • the heat exchange medium in the vacuum heat collecting tube mainly obtains heat by heat exchange with the tube wall of the metal tube, and the conventional two-head vacuum collecting tube has a relatively small heat exchange area because of only one metal tube. Therefore, the heat exchange efficiency is relatively low. Moreover, if the diameter of the metal pipe is increased, the capacity of the heat exchange medium is increased, thereby affecting the heat exchange efficiency.
  • the technical problem to be solved by the present invention is to provide a solar vacuum heat collecting tube which can increase the diameter of the metal heat absorbing body and reduce the capacity of the heat exchange medium, thereby improving the heat collecting efficiency and the heat exchange efficiency.
  • the technical problem to be solved by the present invention is to provide a solar vacuum heat collecting tube, which can reduce the sealing interface diameter of the metal heat absorbing body and the glass tube port, thereby making the sealing more reliable, improving the yield and the service life.
  • a solar vacuum heat collecting tube comprising a vacuum glass tube and a metal heat absorbing body sleeved in the vacuum glass tube, wherein
  • the metal heat absorber comprises:
  • the metal heat absorbing fin is formed into a cylindrical shape extending in the axial direction of the vacuum glass tube, and is heat-exchanged with the metal heat absorbing tube.
  • the metal heat absorbing fin is bent from the outside to the inside to form a groove, and the metal heat absorbing tube is embedded in the groove to form heat exchange with the metal heat absorbing fin. connection.
  • the shape of the groove coincides with the outer contour of the metal heat absorbing tube, so that the metal heat absorbing tube can closely fit with the groove groove to form a better heat exchange effect.
  • the metal heat absorbing tube is tightly crimped or welded into the groove of the metal heat absorbing fin.
  • the metal heat absorbing fin is formed in a cylindrical shape substantially coaxial with the glass tube.
  • the two ends of the metal heat absorbing tube bundle are respectively connected to a metal outlet tube, and the metal outlet tube extends from the glass tube to the two ports of the glass tube, so that the metal outlet tube at both ends and the metal suction tube
  • the heat pipe bundles together form a heat exchange medium passage opening at both ends.
  • the diameter of the metal outlet pipe is larger than the diameter of the single metal heat pipe, but is much smaller than the diameter of the metal heat absorbing fin.
  • the glass tube port is sealed with a metal koving cover, and a metal bellows is respectively disposed outside the metal outlet tube at the two ends, and a port and a metal outlet tube of the metal bellows are respectively disposed.
  • the seals are welded together and the other port is welded to the metal slab.
  • the metal bellows described above is located in the glass tube.
  • the metal heat absorbing fins are made of aluminum or copper.
  • an anti-reflection film is prepared on the inner surface and/or the outer surface of the associated vacuum glass tube to enhance the transmittance of sunlight and improve the heat collection efficiency.
  • the surface of the metal heat absorbing body is plated with a solar selective absorbing coating.
  • the effect of the solar vacuum heat collecting tube of the present invention is remarkable: 1) the metal heat absorbing body is formed by the cylindrical metal heat absorbing fin and the metal heat absorbing tube bundle, and the metal heat absorbing body The diameter of the cylinder can be prevented from being limited by the fluid capacity, and can be made as large as possible, thereby contributing to the concentrating and concentrating efficiency of the concentrating solar energy receiving device, and improving the heat collecting efficiency of the solar vacuum heat collecting tube. 2) Since the heat exchange medium is only accommodated in each metal heat absorbing tube of the metal heat absorbing tube bundle, the capacity of the heat exchange medium is greatly reduced, thereby improving the heat exchange efficiency of the heat exchange medium.
  • the diameter of the corresponding metal outlet tube that is connected to both ends of the metal heat absorbing tube bundle can be much smaller than the diameter of the metal heat absorbing fin, thereby having a smaller outlet diameter.
  • the cylindrical metal heat absorbing fin does not need to displace the heat medium, the required strength is greatly reduced, so that the metal heat absorbing fin can be made of a metal material having high heat conductivity, such as aluminum or copper, thereby Metal
  • the temperature difference between the upper and lower sides of the heat absorbing body is reduced, and the influence of the deformation is greatly eliminated or reduced, so that the length of the solar vacuum heat collecting tube can be increased as needed, and the temperature of the heated heat exchange medium can be increased.
  • FIG. 1 is a schematic longitudinal sectional structural view of a solar vacuum heat collecting tube of the present invention
  • FIG. 2 is a schematic cross-sectional structural view of a solar vacuum heat collecting tube of the present invention
  • FIG. 3 is an enlarged view of a portion A of FIG. 2 of the present invention.
  • FIG. 4 is another schematic cross-sectional structural view of the solar vacuum heat collecting tube of the present invention.
  • FIG. 5 is a schematic cross-sectional structural view of a solar vacuum heat collecting tube of the present invention.
  • the basic structure of the solar vacuum heat collecting tube of the present invention is the same as that of the existing solar vacuum tube, and includes a vacuum glass tube 1 and a metal heat absorbing body disposed inside the vacuum glass tube 1. 2.
  • the outer surface of the metal heat absorbing body 2 is plated with a solar selective absorbing coating 21.
  • the metal heat absorbing body 2 comprises: a metal heat absorbing tube bundle having two or more metal heat absorbing tubes 22 disposed in parallel with the axis of the glass tube 1;
  • the heat absorbing fins 23 are formed in a cylindrical shape extending in the axial direction of the vacuum glass tube 1, and are heat-exchanged with the metal heat absorbing tubes 22.
  • the diameter of the metal heat absorbing fins 23 can be prevented from being limited by the fluid capacity of the heat exchange medium, and can be made as large as possible, thereby greatly improving the solar vacuum set.
  • the heat collecting efficiency of the heat pipe is far less than the heat exchange medium capacity of the conventional single-tube metal heat absorbing body, thereby greatly improving The heat exchange efficiency.
  • the metal heat absorbing fins 23 can be bent inwardly from the outside to form a groove 231, and the metal heat absorbing tube 22 is embedded.
  • the recess 231 is disposed in the recess 231 to form a heat exchange connection with the metal heat absorbing fins 23.
  • the shape of the groove 231 can be consistent with the outer contour of the metal heat absorbing tube 22, so that the metal heat absorbing tube 22 is formed. It can be closely adhered to the groove 231 to form a better heat exchange effect.
  • the metal heat absorbing tube 22 can be engaged with the groove 231 by any heat exchange connection, and the specific connection manner can be unrestricted as long as the heat exchange effect between them can be ensured.
  • the metal heat absorbing tube 22 can be tightly crimped or welded into the recess 231 of the metal heat absorbing fin 23 to form a heat exchange connection with the outer wall of the recess 231.
  • the metal heat absorbing tube 22 can also be bonded to the groove 231 by a high temperature thermal conductive adhesive to form a heat exchange connection with the outer wall of the recess 231.
  • the metal heat absorbing fins 23 may be formed in a cylindrical shape substantially coaxial with the glass tube 1.
  • the two ends of the metal heat absorbing tube bundle can be respectively connected to a metal outlet tube 24, and the metal outlet tube 24 extends from the glass tube 1 to the glass tube 1.
  • the diameter of the metal outlet tube 24 and the total amount of the heat exchange medium in the entire metal heat absorbing tube 22 of the metal heat absorbing tube bundle The flow is adapted.
  • the diameter of the metal outlet tube 24 will be larger than the diameter of the single metal heat absorption tube 22. However, it is much smaller than the diameter of the metal heat absorbing fin 23.
  • the metal outlet tube of the present invention has a smaller sealing interface diameter, thereby making the glass sealing more reliable and improving the solar vacuum heat collecting tube. Yield and service life.
  • the glass tube 1 port is sealed with a metal koving cover 3, and a metal bellows 4 is respectively disposed outside the metal outlet tube 24 at the two ends.
  • One port 41 of the metal bellows 4 is sealingly welded to the metal outlet tube 24, and the other port 42 is welded to the metal koving cover 3 to form a sealed environment within the glass tube 1.
  • the glass tube 1 is evacuated and placed in a getter to maintain the degree of vacuum in the glass tube 1 to prevent heat loss.
  • the metal kovar cover 3 can be sealed and sealed with the glass tube 1 by a molten metal or heat sealing method. Since the metal bellows 4 has a certain degree of flexibility, it can absorb the expansion deformation well, thereby eliminating the adverse effects between the glass tube 1 and the metal heat absorbing body 2 due to the difference in temperature and material expansion characteristics.
  • the above-described metal bellows 4 is located in the glass tube 1.
  • the metal heat absorbing fins 23 do not need to displace the heat medium, the required strength is greatly reduced, so that the metal heat absorbing fins 23 can be made of a metal material having high heat conductivity.
  • a metal material having high heat conductivity For example, aluminum or copper, so that the temperature difference between the upper and lower sides of the metal heat absorbing body 2 is reduced, the influence of deformation is greatly eliminated or weakened, and the length of the solar vacuum heat collecting tube can be increased as needed to increase the temperature of the heat exchange medium heated.
  • the solar vacuum heat collecting tube of the present invention may have a length of 4 m, 6 m or more.
  • an anti-reflection film 11 may be prepared on the inner surface and/or the outer surface of the associated vacuum glass tube 1 to enhance the transmittance of sunlight and improve the heat collection efficiency.
  • Fig. 2 shows an example in which an anti-reflection film is prepared on both the inner surface and the outer surface of the vacuum glass tube 1.
  • the number of metal heat absorbing tubes 22 of the metal heat absorbing tube bundle can be determined according to actual needs, as shown in FIG. 5, which is an example of having two metal heat absorbing tubes 22; 3 and FIG. 4 are examples of having four metal heat absorbing tubes 22.
  • the plurality of metal heat absorbing tubes 22 may be evenly distributed on the outer surface of the cylindrical metal heat absorbing fins 23, as shown in FIGS. 2 and 5; or, according to sunlight
  • the plurality of metal heat absorbing tubes 22 may be unevenly distributed on the outer circumference of the cylindrical metal heat absorbing fins 23 to achieve a better heat collecting effect, depending on the irradiation angle and the condensing area of the concentrator.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Physics & Mathematics (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Sustainable Development (AREA)
  • Sustainable Energy (AREA)
  • Thermal Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Dispersion Chemistry (AREA)
  • Photovoltaic Devices (AREA)

Abstract

Tube de récupération de chaleur sous vide solaire comprenant un tube en verre sous vide (1) et un absorbeur de chaleur métallique (2) disposé à l'intérieur du tube en verre sous vide (1). L'absorbeur de chaleur métallique (2) comprend un faisceau de tubes métalliques absorbeurs de chaleur comprenant deux tubes métalliques absorbeurs de chaleur (22) ou plus, et une ailette métallique tubulaire d'absorption de chaleur (23). L'ailette métallique d'absorption de chaleur (23) est raccordée thermiquement aux tubes métalliques absorbeurs de chaleur (22).
PCT/CN2007/070202 2007-06-28 2007-06-28 Tube de récupération de chaleur sous vide solaire WO2009000129A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/CN2007/070202 WO2009000129A1 (fr) 2007-06-28 2007-06-28 Tube de récupération de chaleur sous vide solaire

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/CN2007/070202 WO2009000129A1 (fr) 2007-06-28 2007-06-28 Tube de récupération de chaleur sous vide solaire

Publications (1)

Publication Number Publication Date
WO2009000129A1 true WO2009000129A1 (fr) 2008-12-31

Family

ID=40185167

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/CN2007/070202 WO2009000129A1 (fr) 2007-06-28 2007-06-28 Tube de récupération de chaleur sous vide solaire

Country Status (1)

Country Link
WO (1) WO2009000129A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102010008415B4 (de) * 2010-02-18 2012-05-31 Dirk Besier Absorbersystem für Solarstrahlung zur Energiegewinnung
CN109855312A (zh) * 2019-01-17 2019-06-07 河北道荣新能源科技有限公司 薄膜光伏发电耦合选择性吸收涂层太阳能集热管
EP2247751B1 (fr) 2008-02-04 2022-10-05 Hazera Seeds Ltd. Plants de poivrons résistants à la maladie

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5592845A (en) * 1978-12-29 1980-07-14 Matsushita Electric Works Ltd Natural circulation type water heating apparatus utilizing solar heat
JPS5592841A (en) * 1978-12-28 1980-07-14 Sharp Corp Solar heat collector
DE19532993A1 (de) * 1995-09-07 1997-03-13 Messer Griesheim Gmbh Sonnenkollektor mit einer für Sonnenstrahlung durchlässigen, gasgedämmten Röhre
WO1999030089A1 (fr) * 1997-12-08 1999-06-17 Hwa Rang Park Capteur solaire a tubes sous vide, systeme de concentration optique et technique d'installation associee
CN2389326Y (zh) * 1999-10-14 2000-07-26 北京清华阳光太阳能设备有限责任公司 一种开口薄壁圆筒形热导金属翼片
CN2637994Y (zh) * 2003-08-02 2004-09-01 扬州市赛恩斯科技发展有限公司 新型直通式太阳能真空集热管

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5592841A (en) * 1978-12-28 1980-07-14 Sharp Corp Solar heat collector
JPS5592845A (en) * 1978-12-29 1980-07-14 Matsushita Electric Works Ltd Natural circulation type water heating apparatus utilizing solar heat
DE19532993A1 (de) * 1995-09-07 1997-03-13 Messer Griesheim Gmbh Sonnenkollektor mit einer für Sonnenstrahlung durchlässigen, gasgedämmten Röhre
WO1999030089A1 (fr) * 1997-12-08 1999-06-17 Hwa Rang Park Capteur solaire a tubes sous vide, systeme de concentration optique et technique d'installation associee
CN2389326Y (zh) * 1999-10-14 2000-07-26 北京清华阳光太阳能设备有限责任公司 一种开口薄壁圆筒形热导金属翼片
CN2637994Y (zh) * 2003-08-02 2004-09-01 扬州市赛恩斯科技发展有限公司 新型直通式太阳能真空集热管

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2247751B1 (fr) 2008-02-04 2022-10-05 Hazera Seeds Ltd. Plants de poivrons résistants à la maladie
DE102010008415B4 (de) * 2010-02-18 2012-05-31 Dirk Besier Absorbersystem für Solarstrahlung zur Energiegewinnung
CN109855312A (zh) * 2019-01-17 2019-06-07 河北道荣新能源科技有限公司 薄膜光伏发电耦合选择性吸收涂层太阳能集热管

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