WO2010057884A1 - Collecteur cylindro-parabolique à foyer fixe - Google Patents

Collecteur cylindro-parabolique à foyer fixe Download PDF

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Publication number
WO2010057884A1
WO2010057884A1 PCT/EP2009/065313 EP2009065313W WO2010057884A1 WO 2010057884 A1 WO2010057884 A1 WO 2010057884A1 EP 2009065313 W EP2009065313 W EP 2009065313W WO 2010057884 A1 WO2010057884 A1 WO 2010057884A1
Authority
WO
WIPO (PCT)
Prior art keywords
mirror
parabolic trough
fixed focus
trough collector
mirror segments
Prior art date
Application number
PCT/EP2009/065313
Other languages
German (de)
English (en)
Inventor
Christoph Prahl
Original Assignee
Deutsches Zentrum für Luft- und Raumfahrt e.V.
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 Deutsches Zentrum für Luft- und Raumfahrt e.V. filed Critical Deutsches Zentrum für Luft- und Raumfahrt e.V.
Priority to ES09753111T priority Critical patent/ES2401755T3/es
Priority to EP09753111A priority patent/EP2347193B1/fr
Priority to US13/128,831 priority patent/US20110214666A1/en
Publication of WO2010057884A1 publication Critical patent/WO2010057884A1/fr

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24S—SOLAR HEAT COLLECTORS; SOLAR HEAT SYSTEMS
    • F24S23/00—Arrangements for concentrating solar-rays for solar heat collectors
    • F24S23/70—Arrangements for concentrating solar-rays for solar heat collectors with reflectors
    • F24S23/74—Arrangements for concentrating solar-rays for solar heat collectors with reflectors with trough-shaped or cylindro-parabolic reflective surfaces
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24S—SOLAR HEAT COLLECTORS; SOLAR HEAT SYSTEMS
    • F24S23/00—Arrangements for concentrating solar-rays for solar heat collectors
    • F24S23/70—Arrangements for concentrating solar-rays for solar heat collectors with reflectors
    • F24S2023/87—Reflectors layout
    • 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

Definitions

  • the invention relates to a fixed focus parabolic trough collector for solar thermal power plants for capturing solar radiation, with an elongated mirror structure forming a focal line, and an absorber tube extending along the focal line.
  • Solar thermal power plants use the energy of sunlight to generate electricity.
  • the solar radiation is focused by means of optical concentrators on an absorber in which circulates a heat transfer medium.
  • the optical concentrators represent the largest investment in solar thermal power plants and significantly influence their efficiency.
  • Various research projects relate to the development of new materials for the Collectors. Important parameters for the energy yield and the efficiency are design and construction of the collector, thereby placing high demands on the manufacturing tolerances and stability.
  • a parabolic trough collector contains an elongated mirror structure with a parabolic cross-section. Typical aperture openings are 5 m - 7 m.
  • Single Solar Collector Elements (SCE) approximately 12 meters long, are assembled into units of 150 meters in length, which are generally oriented north-south, and are coupled to a central drive unit The axis of rotation of the mirror structure or of the respective support structure is located near the apex of the parabola, approximately 1.80 m away from the absorber tube Due to the tracking of the entire unit of mirror structure and absorber tube, it is achieved that there is no "blocking" or " The concentration factor is around 50. Larger concentration factors require larger aperture openings, which increases the optical accuracy requirements, as possible mirror errors occur increase the distance to the absorber tube.
  • the wind load is the largest force acting on the collector, which gains in importance with increasing aperture and mirror surface. Therefore, complex and heavy support structures are needed for larger collectors.
  • the co-moving absorber tube outside the axis of rotation requires flexible pipe connectors, which must be designed for high temperatures and pressures.
  • ball joints are used. Especially in direct evaporation such joints are critical points because of the high loads.
  • Fresnel collectors are also known.
  • the Fresnel collector is a line-concentrating system with a fixed absorber tube. Narrow rows of mirrors are individually rotated to focus the sunlight in the direction of the absorber tube during the day.
  • the individual mirror rows can be made of flat glass, which can be bent into the required curvature. The construction is less susceptible to wind.
  • the absorber pipe is mounted at a height of about 8 m above the rows of mirrors. As the distance between mirror and absorber increases, the demands on mirror accuracy and tracking also increase. Due to blocking, shading and the higher cosine losses, the Fresnel collector achieves a lower annual removal compared to the parabolic trough collector.
  • the invention has for its object to provide a parabolic trough collector, which provides a high annual yield, has low susceptibility to wind and is easy and inexpensive to implement.
  • the fixed focus parabolic trough collector is defined by the patent claim 1. It is characterized in that the mirror structure consists of several mirror segments, wherein at least two adjacent mirror segments form a gap through which radiation, which is reflected by a third or further mirror segments, strikes the absorber tube.
  • the invention utilizes a plurality of mirror segments offset from each other in the direction of the incident solar radiation (or in the opposite direction), all of which have the same focal point.
  • the mirror segments are rigidly connected to each other and rotate together around the absorber tube.
  • the Fixed Focus parabolic trough collector has a small collector depth due to the offset mirror segments. The collector surface is broken so that the wind load acting on the collector is reduced. The length of the beam paths is minimized for the reflected solar radiation. Thereby and due to the avoidance of shading results in a high efficiency and high power output.
  • the mirror segments are arranged symmetrically to a longitudinal center plane of the mirror structure, wherein the longitudinal center plane contains the absorber tube (focal line) and the apex line of all parabolic segments.
  • the mirror segments are arranged without overlapping in the projection of radiation incident parallel to the longitudinal center plane. In this way shadowing of mirror areas is avoided.
  • the mirror segments are preferably arranged such that radiation incident parallel to the longitudinal center plane can not pass the gap. This means that the upstream mirror segment exactly covers the gap between two adjacent mirror segments. This ensures that no incident in the region of the mirror segments radiation is lost.
  • two lateral mirror segments arranged symmetrically with respect to the longitudinal center plane are offset in relation to a central mirror segment in the direction of the radiation incidence and that two outer mirror segments are set back relative to the lateral mirror segments. This gives a compact mirror structure of shallow depth.
  • the supporting structure and the mirror segments are arranged so that their common center of gravity coincides with the focal point of the mirror structure.
  • the axis of rotation and the absorber tube are coaxial with each other. It eliminates complex flexible pipe connectors and the absorber pipes can be connected to each other by the shortest route.
  • the Fixed Focus parabolic trough collector can be divided over its length into individual modules that are individually driven. This eliminates a heavy torque box, which must transmit the torque over the entire collector length. In addition, a flat terrain over the entire collector length is not required. Since the collector can rotate freely around the absorber tube, a secure stow position is possible with the mirror surface facing the ground.
  • Fig. 1 is a schematic representation of one of several elements
  • Support structure wherein the main axis of inertia coincides with the absorber tube.
  • FIG. 1 shows a possible arrangement of several mirror segments in a fixed focus parabolic trough collector.
  • mirror segments which correspond to parabolic segments with different focal lengths, are arranged around a common focal point such that the reflected beams reach the absorber tube unhindered.
  • the mirror structure generally designated 10, consists of a plurality of parabolically curved mirror segments.
  • a central mirror segment Sl is present, that of two side mirror segments S2 flanked.
  • the mirror structure 10 is tracked to the position of the sun, so that the longitudinal center plane 11 of the mirror structure is aligned parallel to the direction 12 of the incident solar radiation.
  • the focus of the mirror structure 10 is the absorber tube 13, which absorbs the sunlight on its surface and heats the circulating in the absorber heat transfer medium.
  • the mirror structure 10 and the absorber tube 13 form an elongate collector, which is referred to herein as fixed focus parabolic trough collector, although the mirror segments Sl, S2, S3 do not form a closed parabolic trough.
  • the middle radiation area R1 is assigned to the middle mirror segment S1
  • the lateral radiation areas R2 are assigned to the lateral mirror segments S2
  • the outer radiation areas R3 are assigned to the outer mirror segments S3.
  • Figure 2 shows the arrangement of the mirror segments Sl, S2, S3 on a common support structure 20.
  • the support structure is a truss structure with longitudinal beams 21, which are here designed as tubes, and transverse struts 22.
  • the support structure 20 has together with the mirror structure 10 has a principal axis of inertia, which coincides with the absorber tube 13.
  • the main axis of inertia is coaxial with the absorber tube. Slight deviations up to five times the diameter of the absorber tube are possible.
  • the fact that the center of gravity of the parabolic trough collector is close to the axis of rotation, the weight of the required support structure is reduced.
  • the invention offers the advantage of dividing the mirror surface into mutually offset mirror segments, whereby the path of the reflected radiation is minimized. Furthermore, there is a reduced wind load. The main axis of inertia and the focal line coincide, which reduces the design effort.
  • a separate decentralized drive can be provided via a stepping motor. Also possible is the common drive via a central hydraulic unit.
  • the decentralized drive offers the advantage of flexibly adapting the captured light quantity to the power generation process with the rotation of individual SCEs.

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Sustainable Development (AREA)
  • Sustainable Energy (AREA)
  • Thermal Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Optical Elements Other Than Lenses (AREA)

Abstract

La présente invention concerne un collecteur cylindro-parabolique à foyer fixe présentant une structure réfléchissante (10) qui se compose de plusieurs segments réfléchissants (S1, S2, S3,...). Au moins deux segments réfléchissants (S1, S2) voisins forment un espace (14) à travers lequel un rayonnement (R3) réfléchi par un troisième segment réfléchissant (S3) passe pour rencontrer le tube absorbeur (13) dont l'emplacement correspond au foyer commun à tous les segments réfléchissants. Cela permet de minimiser le chemin parcouru par le rayonnement réfléchi. La structure réfléchissante est compacte vis-à-vis de l'ouverture, et est peu sensible aux vents.
PCT/EP2009/065313 2008-11-18 2009-11-17 Collecteur cylindro-parabolique à foyer fixe WO2010057884A1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
ES09753111T ES2401755T3 (es) 2008-11-18 2009-11-17 Colector de canaleta parabólica de foco fijo
EP09753111A EP2347193B1 (fr) 2008-11-18 2009-11-17 Collecteur cylindro-parabolique à foyer fixe
US13/128,831 US20110214666A1 (en) 2008-11-18 2009-11-17 Fixed focus parabolic trough collector

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102008057868.1A DE102008057868B4 (de) 2008-11-18 2008-11-18 Parabolrinnen-Kollektor
DE102008057868.1 2008-11-18

Publications (1)

Publication Number Publication Date
WO2010057884A1 true WO2010057884A1 (fr) 2010-05-27

Family

ID=42026358

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2009/065313 WO2010057884A1 (fr) 2008-11-18 2009-11-17 Collecteur cylindro-parabolique à foyer fixe

Country Status (5)

Country Link
US (1) US20110214666A1 (fr)
EP (1) EP2347193B1 (fr)
DE (1) DE102008057868B4 (fr)
ES (1) ES2401755T3 (fr)
WO (1) WO2010057884A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101191004B1 (ko) * 2011-12-07 2012-10-16 김두만 태양열 집열장치

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IL220220A (en) 2011-06-08 2017-01-31 Heliofocus Ltd Spatial structure assemblies
ES2446843B1 (es) * 2012-09-10 2014-12-17 Antonio VARGAS LEÓN Colector solar cilindro parabólico descompuesto
US9442279B2 (en) 2013-08-23 2016-09-13 Jeffrey Michael Citron Open architecture structure for trough shaped solar concentrators
DE202015001498U1 (de) 2015-01-23 2016-04-26 Deutsches Zentrum für Luft- und Raumfahrt e.V. Parabolrinnenkollektormodul, Parabolrinnenkollektoreinheit sowie solarthermisches Kraftwerk
CN109373613B (zh) * 2018-10-30 2024-02-06 中国电力工程顾问集团西北电力设计院有限公司 一种基于分段抛物线函数的反射镜及槽式集热器

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US20020075579A1 (en) * 2000-12-18 2002-06-20 Vasylyev Sergiy Victorovich Apparatus for collecting and converting radiant energy

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US4173213A (en) 1976-09-15 1979-11-06 Kelly Donald A Solar power system, with high concentration, linear reflective solar panels
US4359265A (en) * 1980-01-18 1982-11-16 University Patents, Inc. Controlled directional scattering cavity for tubular absorbers
US4520794A (en) * 1982-03-05 1985-06-04 North American Utility Construction Corporation Solar energy concentrating slat arrangement and collector
US20020075579A1 (en) * 2000-12-18 2002-06-20 Vasylyev Sergiy Victorovich Apparatus for collecting and converting radiant energy

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101191004B1 (ko) * 2011-12-07 2012-10-16 김두만 태양열 집열장치
WO2013085177A1 (fr) * 2011-12-07 2013-06-13 Kim Doo-Man Collecteur thermique solaire

Also Published As

Publication number Publication date
US20110214666A1 (en) 2011-09-08
EP2347193A1 (fr) 2011-07-27
DE102008057868A1 (de) 2010-05-27
EP2347193B1 (fr) 2013-01-02
DE102008057868B4 (de) 2015-01-22
ES2401755T3 (es) 2013-04-24

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