WO2014139536A1 - Fitting device for absorber solar tubes - Google Patents

Fitting device for absorber solar tubes Download PDF

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Publication number
WO2014139536A1
WO2014139536A1 PCT/DK2014/050057 DK2014050057W WO2014139536A1 WO 2014139536 A1 WO2014139536 A1 WO 2014139536A1 DK 2014050057 W DK2014050057 W DK 2014050057W WO 2014139536 A1 WO2014139536 A1 WO 2014139536A1
Authority
WO
WIPO (PCT)
Prior art keywords
tube
fitting
ring
absorber
protective glass
Prior art date
Application number
PCT/DK2014/050057
Other languages
French (fr)
Inventor
Jens William Larsen
Original Assignee
Polyteknik A/S
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 Polyteknik A/S filed Critical Polyteknik A/S
Publication of WO2014139536A1 publication Critical patent/WO2014139536A1/en

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
    • F24S80/00—Details, accessories or component parts of solar heat collectors not provided for in groups F24S10/00-F24S70/00
    • F24S80/30—Arrangements for connecting the fluid circuits of solar collectors with each other or with other components, e.g. pipe connections; Fluid distributing means, e.g. headers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24S—SOLAR HEAT COLLECTORS; SOLAR HEAT SYSTEMS
    • F24S25/00—Arrangement of stationary mountings or supports for solar heat collector modules
    • F24S25/60—Fixation means, e.g. fasteners, specially adapted for supporting solar heat collector modules
    • F24S2025/6004—Fixation means, e.g. fasteners, specially adapted for supporting solar heat collector modules by clipping, e.g. by using snap connectors
    • 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 fitting devices for assembling solar absorber tubes, wherein each solar absorber tube comprises a protective glass tube enclosing an ab- sorber tube.
  • CSP Concentrated Solar Power
  • the absorber tubes also called receiver tubes, have in general two levels of working temperature.
  • the working temperature is typically in the range of 200 to 350 C°
  • the working temperature of the fluid in the tubes is in the range of 400 to 550 C°.
  • the absorber tubes will typically be enclosed in a protective glass tube or glass shielding, where in-between the absorber tube and the protective glass tube either atmospheric air or vacuum is present.
  • the absorber tubes are always enclosed in an evacuated protective glass tube, also called vacuum tube receiver.
  • Absorber tubes are normally stainless steel tubes coaxial with protective glass tubes and having a thermal absorbing coating laid on their outside and a thermal conductive fluid (e.g., water, oil or liquid salt) flowing inside.
  • a protective glass tube and an absorber tube have welded or brazed connections at both ends to connect with another protective glass tube and another absorber tube, respectively.
  • Common for all absorber tubes and protective glass tubes in the market today is that they are welded on the construction site.
  • the glass has bro- ken or has been damaged by sandstorms/heavy pollution or if the vacuum condition is compromised, a protective glass tube cannot be easily replaced, as a cutting and a welding operation must be performed.
  • evacuated protective glass tubes cannot be replaced if the vacuum condition is gone.
  • the main drawbacks of current solar absorber tubes are that they have to be attached together by a welding opera- tion and the protective glass tubes cannot be easily replaced.
  • the object of the invention is to enable an easy assembling and disassembling of solar absorber tubes while avoiding a demanding welding and/or cutting process at the construction site of a solar plant, thus only requiring low-skilled labourers to mount, repair or replace absorber tubes and/or protective glass tubes.
  • a fitting device as described in the preamble of claim 1, wherein said device comprises a fitting tube, which fitting tube has a body, a first fastening arrangement adapted to be mounted to an end of said fitting tube for fastening two of said devices together, and a second fastening arrangement adapted to be mounted to another end of said fitting tube for fastening said device to said protective glass tube while avoiding dispersing solar thermal energy.
  • the advantage of the invention is that of eliminating the need for high-skilled welders and high quality welding and/or cutting operations at the construction site, since a manual, mechanical mounting and dismounting of solar absorber tubes in a CSP plant under construction may be easily performed.
  • said second fastening arrangement comprises a keeper ring formed for establishing a releasable attachment between said protective glass tube and a portion of said fitting tube, a Seeger ring for releasable fastening said keeper ring to said fitting tube, a combined heat insulating and air filtering thermo sta- ble ring formed for insertion between said portion of the fitting tube and a corresponding portion of said keeper ring, and a sealing ring formed for insertion between another portion of said keeper ring and a corresponding portion of said protective glass tube.
  • said combined heat insulating and air filtering thermo stable ring is made of a fibre material such as a braided glass fibre, or a heat resistant and thermal insolating fabric.
  • said sealing ring is made of a polymer material such as a silicone compound or a fluoro-elastomer material (FPM).
  • said fitting tube is welded to said absorber tube.
  • the one end of said fitting tube, where said first fastening arrangement is adapted to be mounted has an outwardly-projected rim, which rim has an inwardly-projected rear portion, wherein said first fastening arrange- ment comprises a clamping ring having a recess adapted to interlock with said rear portion.
  • 3° ⁇ a ⁇ 45°.
  • a 15°.
  • a recess is provided at said rim for hosting a seal- ing.
  • an outwardly-, radial- projected portion is provided, which outwardly-, radial-projected portion has a front portion adapted to constrain an axial movement of a supporting means (e.g., a fork) when a solar tube absorber is mounted.
  • a supporting means e.g., a fork
  • Absorber tubes are normally mounted in forks that hold them fixed in the focal point in front of the parabolic reflectors.
  • the forks may be mounted at the fitting tubes, in-between the out- wardly-projected rim and the outwardly-, radial-projected portion.
  • said outwardly-, radial-projected portion has a rear portion extending up to an inner diameter of said protective glass tube.
  • FIGs.1 A-B Fitting device fastened to a solar absorber tube.
  • FIG.2 Removal or replacement of a protective glass tube by using the fitting device.
  • FIGs.3 A-B Attachment and fixation of two solar absorber tubes by using the fitting device.
  • FIG.4 An example of a clamping ring.
  • FIG.1A shows a cross-sectional view of a solar absorber tube 1 comprising a protective glass tube 2 coaxially enclosing an absorber tube 3.
  • the absorber tube 3 has a heat absorbing coating 14 deposited on its cylindrical surface.
  • the fitting device includes a fitting tube 4 with an inner diameter equal to the inner diameter of the absorber tube 3 and welded to the absorber tube 3 at a welding point 15.
  • the solar absorber tube 1 is fastened to the fitting device by means of an arrangement comprising: a keeper ring 6, which keeps the protective glass tube 2 horizontally- and coaxially-fixed; a Seeger ring 7, which ensures the correct position of the keeper ring 6; a combined heat insulating and air filtering thermo stable ring 8, which is placed underneath the keeper ring 6; and a sealing ring 9, which has the function of fixing and air tightening between the protective glass tube 2 and the keeper ring 6.
  • the fitting device is provided with a recess 20 (ref. FIG. IB) at the rim 11 for hosting a sealing 16.
  • the inclined surface 12 having an angle a (e.g., 15°) has an interlocking function together with the clamping ring 10 (ref. FIG.3A).
  • FIG. IB shows the solar absorber tube 1 in FIG.1A seen from outside.
  • the total length L may typically vary (but not limited to) between 2000 and 6000 mm, and the diameter of the absorber tube 3 may typically vary (but not limited to) between 25 and 75 mm.
  • FIG.2 shows an example of how to remove or replace the protective glass tube 2.
  • the Seeger ring 7 may be removed, then the keeper ring 6 and finally the protective glass tube 2.
  • the outwardly-, radial-projected portion which is positioned towards the end of the fitting tube 4 where the second fastening arrangement was mounted, has its rear portion 19 extending up to the inner diameter of the protective glass tube 2.
  • FIG.3A and FIG.3B show the attachment and fixation between two solar absorber tubes 1 in a cross-sectional view and a lateral view seen from outside, respectively.
  • Bolts 17, nuts 18 and the clamping ring 10 have the function of keeping the two ends tight together.
  • one of the fitting devices is provided with a recess 20 at the rim 11 for hosting the sealing 16.
  • FIG.4 shows an example of a clamping ring 10 constituted by two half rings. In particular, note the recess 13 in each of the half rings composing the two clamping rings 10.

Abstract

The present invention relates to a fitting device for assembling solar absorber tubes (1), each solar absorber tube (1) comprising a protective glass tube (2) enclosing an absorber tube (3), wherein said device comprises a fitting tube (4), which fitting tube (4) has a body (5), a first fastening arrangement adapted to be mounted to an end of said fitting tube (4) for fastening two of said devices together, and a second fastening arrangement adapted to be mounted to another end of said fitting tube (4) for fastening said device to said protective glass tube (2) while avoiding dispersing solar thermal energy.

Description

Fitting device for solar absorber tubes Field of the Invention
The present invention relates to fitting devices for assembling solar absorber tubes, wherein each solar absorber tube comprises a protective glass tube enclosing an ab- sorber tube.
Background of the Invention
During the last decade there has been a great increase in the number of installed Concentrated Solar Power (CSP) plants for electrical power generation to the grid and thermal energy generation for industrial use and process heating. There are a few major types of technologies in this field: power tower solutions, parabolic disc solutions, parabolic trough solutions and Fresnel solutions. Common to power tower and parabolic disc solutions is that the solar power is focused to a central point or a central area of absorption of the thermal energy. These thermal absorbers have a typical size ranging from less than one square meter to several square meters. Common to parabolic trough and Fresnel solutions is that the thermal power is focused by moving mirrors to typically horizontally-placed absorber tubes. The length of the absorber tubes may vary from a few meters to several kilometres in one installation.
The absorber tubes, also called receiver tubes, have in general two levels of working temperature. For process heat generation, the working temperature is typically in the range of 200 to 350 C°, whereas for electrical power generation, the working temperature of the fluid in the tubes is in the range of 400 to 550 C°. For the temperature range of 200-350 C°, the absorber tubes will typically be enclosed in a protective glass tube or glass shielding, where in-between the absorber tube and the protective glass tube either atmospheric air or vacuum is present. For the temperature range of 400-550 C°, the absorber tubes are always enclosed in an evacuated protective glass tube, also called vacuum tube receiver. Absorber tubes are normally stainless steel tubes coaxial with protective glass tubes and having a thermal absorbing coating laid on their outside and a thermal conductive fluid (e.g., water, oil or liquid salt) flowing inside. A protective glass tube and an absorber tube have welded or brazed connections at both ends to connect with another protective glass tube and another absorber tube, respectively. Common for all absorber tubes and protective glass tubes in the market today is that they are welded on the construction site. Moreover, if the glass has bro- ken or has been damaged by sandstorms/heavy pollution or if the vacuum condition is compromised, a protective glass tube cannot be easily replaced, as a cutting and a welding operation must be performed. In particular, evacuated protective glass tubes cannot be replaced if the vacuum condition is gone. Thus, the main drawbacks of current solar absorber tubes are that they have to be attached together by a welding opera- tion and the protective glass tubes cannot be easily replaced.
Hence, there is a need in the technical field of solar absorber tubes of overcoming the aforementioned drawbacks of the state-of-the-art solutions.
Object of the Invention
The object of the invention is to enable an easy assembling and disassembling of solar absorber tubes while avoiding a demanding welding and/or cutting process at the construction site of a solar plant, thus only requiring low-skilled labourers to mount, repair or replace absorber tubes and/or protective glass tubes.
Description of the Invention
The aforementioned and other objects and advantages of the invention are achieved by a fitting device as described in the preamble of claim 1, wherein said device comprises a fitting tube, which fitting tube has a body, a first fastening arrangement adapted to be mounted to an end of said fitting tube for fastening two of said devices together, and a second fastening arrangement adapted to be mounted to another end of said fitting tube for fastening said device to said protective glass tube while avoiding dispersing solar thermal energy.
The advantage of the invention is that of eliminating the need for high-skilled welders and high quality welding and/or cutting operations at the construction site, since a manual, mechanical mounting and dismounting of solar absorber tubes in a CSP plant under construction may be easily performed. In an embodiment of the invention, said second fastening arrangement comprises a keeper ring formed for establishing a releasable attachment between said protective glass tube and a portion of said fitting tube, a Seeger ring for releasable fastening said keeper ring to said fitting tube, a combined heat insulating and air filtering thermo sta- ble ring formed for insertion between said portion of the fitting tube and a corresponding portion of said keeper ring, and a sealing ring formed for insertion between another portion of said keeper ring and a corresponding portion of said protective glass tube.
Preferably, said combined heat insulating and air filtering thermo stable ring is made of a fibre material such as a braided glass fibre, or a heat resistant and thermal insolating fabric. Advantageously, said sealing ring is made of a polymer material such as a silicone compound or a fluoro-elastomer material (FPM). An advantage of this embodiment is that of firmly fastening the protective glass tube to the fitting tube and, at the same time, avoiding the dispersion of solar thermal energy.
In an embodiment of the invention, said fitting tube is welded to said absorber tube. An advantage of this embodiment is that of avoiding leakage of the thermal conductive fluid flowing between the absorber tube and the fitting device. Moreover, the welding may be carried out at the manufacturing facility instead of the construction site, thus a most cost effective welding process can be performed and properly inspected.
In an embodiment of the invention, the one end of said fitting tube, where said first fastening arrangement is adapted to be mounted, has an outwardly-projected rim, which rim has an inwardly-projected rear portion, wherein said first fastening arrange- ment comprises a clamping ring having a recess adapted to interlock with said rear portion. An advantage of this embodiment is that of firmly fastening one fitting device to another fitting device by providing an interlocking between the fitting tube and the clamping ring such that the latter is firmly hold in place and does not slip away due to the applied forces, vibrations, etc.
In an embodiment of the invention, said rear portion has an angle 0° < a <= 45° with respect to the body of said fitting tube. Preferably, 3° < a <= 45°. Most preferably, a = 15°. An advantage of this embodiment is that of providing an even stronger and reliable interlocking between the fitting tube and the clamping ring.
In an embodiment of the invention, a recess is provided at said rim for hosting a seal- ing. An advantage of this embodiment is that of fixing and air and fluid tightening the fitting device when in contact with another fitting device.
In an embodiment of the invention, towards the one end of said fitting tube, where said second fastening arrangement is adapted to be mounted, an outwardly-, radial- projected portion is provided, which outwardly-, radial-projected portion has a front portion adapted to constrain an axial movement of a supporting means (e.g., a fork) when a solar tube absorber is mounted. Absorber tubes are normally mounted in forks that hold them fixed in the focal point in front of the parabolic reflectors. In the context of the invention, the forks may be mounted at the fitting tubes, in-between the out- wardly-projected rim and the outwardly-, radial-projected portion. An advantage of this embodiment is that of ensuring that the forks do not slip away axially, as they are constrained by the front portion of the outwardly-, radial-projected portion.
In an embodiment of the invention, said outwardly-, radial-projected portion has a rear portion extending up to an inner diameter of said protective glass tube. An advantage of this embodiment is that of best supporting the keeper ring when mounted and serving as a lifting support for the delicate and scratch sensitive absorber coating surface of the absorber tube, when the absorber tube is handled in the stock and assembly process.
Hereafter, the invention will be described in connection with drawings illustrating non- limiting examples of a fitting device.
Description of the Drawings
FIGs.1 A-B: Fitting device fastened to a solar absorber tube.
FIG.2: Removal or replacement of a protective glass tube by using the fitting device.
FIGs.3 A-B: Attachment and fixation of two solar absorber tubes by using the fitting device. FIG.4: An example of a clamping ring. Detailed Description of the Invention
FIG.1A shows a cross-sectional view of a solar absorber tube 1 comprising a protective glass tube 2 coaxially enclosing an absorber tube 3. The absorber tube 3 has a heat absorbing coating 14 deposited on its cylindrical surface. The fitting device includes a fitting tube 4 with an inner diameter equal to the inner diameter of the absorber tube 3 and welded to the absorber tube 3 at a welding point 15. The solar absorber tube 1 is fastened to the fitting device by means of an arrangement comprising: a keeper ring 6, which keeps the protective glass tube 2 horizontally- and coaxially-fixed; a Seeger ring 7, which ensures the correct position of the keeper ring 6; a combined heat insulating and air filtering thermo stable ring 8, which is placed underneath the keeper ring 6; and a sealing ring 9, which has the function of fixing and air tightening between the protective glass tube 2 and the keeper ring 6. The fitting device is provided with a recess 20 (ref. FIG. IB) at the rim 11 for hosting a sealing 16. The inclined surface 12 having an angle a (e.g., 15°) has an interlocking function together with the clamping ring 10 (ref. FIG.3A).
FIG. IB shows the solar absorber tube 1 in FIG.1A seen from outside. The total length L may typically vary (but not limited to) between 2000 and 6000 mm, and the diameter of the absorber tube 3 may typically vary (but not limited to) between 25 and 75 mm.
FIG.2 shows an example of how to remove or replace the protective glass tube 2. The Seeger ring 7 may be removed, then the keeper ring 6 and finally the protective glass tube 2. In particular, note that the outwardly-, radial-projected portion, which is positioned towards the end of the fitting tube 4 where the second fastening arrangement was mounted, has its rear portion 19 extending up to the inner diameter of the protective glass tube 2.
FIG.3A and FIG.3B show the attachment and fixation between two solar absorber tubes 1 in a cross-sectional view and a lateral view seen from outside, respectively. Bolts 17, nuts 18 and the clamping ring 10 have the function of keeping the two ends tight together. Note that one of the fitting devices is provided with a recess 20 at the rim 11 for hosting the sealing 16. FIG.4 shows an example of a clamping ring 10 constituted by two half rings. In particular, note the recess 13 in each of the half rings composing the two clamping rings 10.

Claims

1. A fitting device for assembling solar absorber tubes (1), each solar absorber tube (1) comprising a protective glass tube (2) enclosing an absorber tube (3), characterized in that said device comprises a fitting tube (4), which fitting tube (4) has a body (5), a first fastening arrangement adapted to be mounted to an end of said fitting tube (4) for fastening two of said devices together, and a second fastening arrangement adapted to be mounted to another end of said fitting tube (4) for fastening said device to said protective glass tube (2) while avoiding dispersing solar thermal energy.
2. A device according to claim 1, characterized in that said second fastening arrangement comprises a keeper ring (6) formed for establishing a releasable attachment between said protective glass tube (2) and a portion of said fitting tube (4), a Seeger ring (7) for releasable fastening said keeper ring (6) to said fitting tube (4), a combined heat insulating and air filtering thermo stable ring (8) formed for insertion between said portion of the fitting tube (4) and a corresponding portion of said keeper ring (6), and a sealing ring (9) formed for insertion between another portion of said keeper ring (6) and a corresponding portion of said protective glass tube (2).
3. A device according to claim 2, characterized in that said combined heat insulating and air filtering thermo stable ring (8) is made of a fibre material.
4. A device according to claim 2 or claim 3, characterized in that said sealing ring (9) is made of a polymer material.
5. A device according to any of the preceding claims, characterized in that said fitting tube (4) is welded to said absorber tube (3).
6. A device according to any of the preceding claims, characterized in that the one end of said fitting tube (4), where said first fastening arrangement is adapted to be mounted, has an outwardly-projected rim (11), which rim (11) has an inwardly- projected rear portion (12), wherein said first fastening arrangement comprises a clamping ring (10) having a recess (13) adapted to interlock with said rear portion (12).
7. A device according to claim 6, characterized in that said rear portion (12) has an angle 0° < (a) <= 45° with respect to the body (5) of said fitting tube (4).
8. A device according to any of the preceding claims, characterized in that a recess (20) is provided at said rim (11) for hosting a sealing (16).
9. A device according to any of the preceding claims, characterized in that towards the one end of said fitting tube (4), where said second fastening arrangement is adapted to be mounted, an outwardly-, radial-projected portion is provided, which outwardly-, radial-projected portion has a front portion adapted to constrain an axial movement of a supporting means when a solar tube absorber is mounted.
10. A device according to claim 9, characterized in that said outwardly-, radial- projected portion has a rear portion (19) extending up to an inner diameter of said protective glass tube (2).
PCT/DK2014/050057 2013-03-12 2014-03-12 Fitting device for absorber solar tubes WO2014139536A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DKPA201370146 2013-03-12
DK201370146A DK177832B1 (en) 2013-03-12 2013-03-12 Fitting device for solar absorber tubes

Publications (1)

Publication Number Publication Date
WO2014139536A1 true WO2014139536A1 (en) 2014-09-18

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU215364U1 (en) * 2022-05-24 2022-12-12 Общество с ограниченной ответственностью "ЗАО Мушарака" SOLAR WATER HEATER WITH VACUUM TUBES

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3933733A1 (en) * 1989-10-09 1991-04-11 Guenter Dr Wiedner Solar radiation receiver - with silicone sealed intermediate piece for two tube parts enclosing collector tube
WO2006105430A2 (en) * 2005-03-31 2006-10-05 Fafco, Inc. Solar water heater
WO2012095886A2 (en) * 2011-01-10 2012-07-19 Meccanotecnica Umbra S.P.A. Connections of concentrating solar power plants

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3933733A1 (en) * 1989-10-09 1991-04-11 Guenter Dr Wiedner Solar radiation receiver - with silicone sealed intermediate piece for two tube parts enclosing collector tube
WO2006105430A2 (en) * 2005-03-31 2006-10-05 Fafco, Inc. Solar water heater
WO2012095886A2 (en) * 2011-01-10 2012-07-19 Meccanotecnica Umbra S.P.A. Connections of concentrating solar power plants

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU215364U1 (en) * 2022-05-24 2022-12-12 Общество с ограниченной ответственностью "ЗАО Мушарака" SOLAR WATER HEATER WITH VACUUM TUBES

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