WO1998038457A1 - Centrale solaire, en particulier centrale solaire a canaux paraboliques - Google Patents

Centrale solaire, en particulier centrale solaire a canaux paraboliques Download PDF

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Publication number
WO1998038457A1
WO1998038457A1 PCT/DE1998/000416 DE9800416W WO9838457A1 WO 1998038457 A1 WO1998038457 A1 WO 1998038457A1 DE 9800416 W DE9800416 W DE 9800416W WO 9838457 A1 WO9838457 A1 WO 9838457A1
Authority
WO
WIPO (PCT)
Prior art keywords
line section
line
solar power
power plant
absorber
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.)
Ceased
Application number
PCT/DE1998/000416
Other languages
German (de)
English (en)
Inventor
Wolfgang Köhler
Reinhard Rippel
Holger Schmidt
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Siemens AG
Siemens Corp
Original Assignee
Siemens AG
Siemens Corp
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 Siemens AG, Siemens Corp filed Critical Siemens AG
Publication of WO1998038457A1 publication Critical patent/WO1998038457A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
    • F03G—SPRING, WEIGHT, INERTIA OR LIKE MOTORS; MECHANICAL-POWER PRODUCING DEVICES OR MECHANISMS, NOT OTHERWISE PROVIDED FOR OR USING ENERGY SOURCES NOT OTHERWISE PROVIDED FOR
    • F03G6/00—Devices for producing mechanical power from solar energy
    • F03G6/06—Devices for producing mechanical power from solar energy with solar energy concentrating means
    • F03G6/065—Devices for producing mechanical power from solar energy with solar energy concentrating means having a Rankine cycle
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
    • F03G—SPRING, WEIGHT, INERTIA OR LIKE MOTORS; MECHANICAL-POWER PRODUCING DEVICES OR MECHANISMS, NOT OTHERWISE PROVIDED FOR OR USING ENERGY SOURCES NOT OTHERWISE PROVIDED FOR
    • F03G6/00—Devices for producing mechanical power from solar energy
    • F03G6/06—Devices for producing mechanical power from solar energy with solar energy concentrating means
    • F03G6/061—Parabolic linear or trough concentrators
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24S—SOLAR HEAT COLLECTORS; SOLAR HEAT SYSTEMS
    • F24S20/00—Solar heat collectors specially adapted for particular uses or environments
    • F24S20/20—Solar heat collectors for receiving concentrated solar energy, e.g. receivers for solar power plants
    • 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
    • F24S40/00—Safety or protection arrangements of solar heat collectors; Preventing malfunction of solar heat collectors
    • F24S40/50—Preventing overheating or overpressure
    • 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
    • Y02E10/46—Conversion of thermal power into mechanical power, e.g. Rankine, Stirling or solar thermal engines

Definitions

  • the invention relates to a solar power plant, in particular to a parabolic nominal solar power plant.
  • Collector fields consist of a larger number of collectors, each comprising a parabolic tube for bundling the sunlight and an absorber line, for example an absorber tube, for absorbing the bundled sunlight. If the equipment to be evaporated is evaporated directly in the absorber line, this is referred to as direct evaporation.
  • the absorber line carrying an operating medium for example water
  • certain operating parameters for example a low mass flow density or a high system pressure
  • gravity-related separation phenomena of the liquid-steam mixture of the operating medium can occur.
  • the heat transfer in the upper area of the absorber line, where steam flows preferentially deteriorates.
  • the temperature of the wall rises to an undesirable extent in the upper region of the absorber line. This leads to bending of the absorber line and to thermal stresses in the same.
  • Another way of reducing the temperature rise in the upper region of the wall of the absorber line is to install displacement bodies in the interior of the absorber line. Although this improves the heat transfer, it also increases the pressure loss in the interior.
  • the invention is therefore based on the object of specifying a solar power plant in which overheating of the wall in the upper region of the absorber line is largely avoided without pressure loss occurring in the interior of the absorber line as a result of the installation of displacement bodies.
  • the stated object is achieved by a solar power plant with at least one absorber line for guiding and heating an operating medium, which comprises at least a first and a second line section, which is in each case essentially arranged horizontally, a third between the first and the second line section Line section is arranged, the level of which is higher than the highest level of the interiors of the first and second line section.
  • the third line section ensures that, during the operation of the parabolic trough solar power plant, sufficient resources, for example water, are present in the upper region of the first line section of the absorber line due to the accumulation of the equipment in the increase in the third line section. This largely prevents overheating of the wall in the upper region of the first line section of the absorber line. Since the first and second line sections are laid essentially horizontally, cost-intensive mechanical support for an absorber line with a predetermined angle of inclination is no longer required. In addition, displacement bodies are no longer used in the interior of the line sections, as a result of which additional pressure losses over the length of the absorber line are avoided.
  • the absorber line is preferably arranged in a parabolic trough.
  • the parabolic trough and the absorber line together form a collector.
  • the third line section is arranged inside the collector.
  • the collectors used in the prior art generally have a large length. By installing the third line section at one or more positions within the collector, overheating of the wall in the upper region of the absorber line is thus avoided.
  • the first line section is arranged in a first parabolic trough, the second line section in a second parabolic trough and the third line section between the spatially separated parabolic troughs.
  • the third line section is arranged between two collectors. This ensures that overheating in the upper wall area of the absorber line is avoided with relatively short absorber lines and thus relatively small collectors. With larger and thus longer collectors, overheating in the last section of the absorber line of the respective collector is avoided.
  • the level of the third line section is approximately Im above the highest level of the interiors of the first and the second line section. This level difference ensures that there is sufficient equipment in the first power section to avoid overheating. This results in an additional pressure loss of at most 0.1 bar.
  • the first line section is preferably arranged in the parabolic trough and the second line section is designed as a steam separator.
  • the operating medium after flowing through a collector, for example the last of a series of collectors arranged one behind the other, is fed directly via the third line section into the second line section designed as a steam separator.
  • the angle ( ⁇ ) between a horizontal and the rise of the third line section is at least 10 °. Overheating is avoided above this value for the angle ( ⁇ ).
  • the inside diameter of the third line section is at least equal to the inside diameter of the other line sections. This measure ensures that the speed of the operating medium, ie in other words the liquid-vapor mixture, in the third line section is equal to or less than the speed of the operating medium in the line sections which are arranged essentially horizontally. The lower the speed of the equipment in the third line section, the more equipment is jammed in the third line section. As a result, more resources are retrospectively available in the first line section to avoid overheating in the same.
  • the third line section is preferably formed in an arc at a transition to the first line section. This measure avoids a restriction of the flow and thus an increase in the speed of the equipment during the deflection in the third line section.
  • a joint that can be rotated about the longitudinal axis of the first or second line section is arranged between the third and the first or second line section.
  • the parabolic trough and the absorber line are rotated around the longitudinal axis of the absorber line according to the position of the sun.
  • 1 shows a side view of a section of a parabolic trough solar power plant in a schematic representation; 2 and 3 show further sections from a parabolic trough solar power plant in a perspective view.
  • a parabolic trough solar power plant 2 comprises a parabolic trough 4 and an absorber line 6, for example an absorber tube, arranged largely in its focal line for guiding and heating an operating medium, for example water.
  • the absorber line 6 comprises three line sections 8, 10, 12 and is mechanically connected to the parabolic trough 4.
  • a first 8 and a second line section 12 are arranged essentially horizontally, a third line section 10 being arranged between these two 8, 12, the level 14 of which is higher than the highest level 16, 18 of the interiors 20, 22 of the first 8 and the second Line section 12 lies.
  • the equipment flows in the direction of arrows 24 through the absorber line 6, i.e. in other words in succession through the first 8, the third 10 and the second line section 12.
  • the third line section 10 thus ensures that, during the operation of the parabolic trough solar power plant 2, sufficient operating resources are also available in the upper region of the first line section 8 of the absorber line 6 due to the fact that it is stowed in a rise 26 in the third line section 10. As a result, overheating of the wall in the upper region of the first line section 8 of the absorber line 6 is largely avoided.
  • the operating medium for example water, usually flows during operation with a mass flow density M of less than 1000 kg / m 2 s.
  • the value for the speed of the water v w when the evaporation starts is less than 1 m / s.
  • the inside diameter of the absorber line 6 is chosen between 50 and 100 mm.
  • the inside diameter of the third line Section 10 is at least equal to the inside diameter of the line sections 8, 12.
  • the at least partially caused backflow of the water means that water is also present in the upper region of the first line section 8 during operation, as a result of which the wall is prevented from overheating and consequently Heat transfer is improved in contrast to the collectors known from the prior art.
  • the level 14 of the third line section 10 is approximately Im above the highest level 16, 18 of the interiors 20, 22 of the first 8 and the second line section 12. This level difference ensures that Most pipe section 8 has enough water to avoid overheating. There is an additional pressure loss of at most 0.1 bar in the third line section 10.
  • the angle ( ⁇ ) 30 between a horizontal 32 and the rise 26 of the third line section 10 is at least 10 °. Overheating is avoided above this value for the angle ( ⁇ ).
  • the third line section 10 is arched at a transition 34 to the first line section 8. This measure prevents the flow from being constricted when the equipment is deflected in the third line section 10.
  • a joint 36, 38 which can be rotated about the longitudinal axis of the first 8 or second line section 12.
  • the parabolic trough 4 is rotated around the longitudinal axis of the absorber line 6 in accordance with the incident solar radiation. It may be useful that in addition to the parabolic trough 4, the absorber line 6 is rotated.
  • the jacket of the third line section 10 is made of a material that ensures mechanical mobility of the third line section 10.
  • the joints 36, 38 are not required.
  • the first line section 8 of the absorber line 6 is in a first parabolic trough 50
  • the second line section 12 in a second parabolic trough 52
  • the third line section 10 between the spatially separated parabolic troughs 50 , 52 arranged.
  • the third line section 10 is thus arranged between two collectors 54, 56.
  • the collectors 54, 56 each comprise a line section 8 or 12 of the absorber line 6 and a parabolic trough 50 or 52.
  • the first line section 8 is arranged in the parabolic trough 52.
  • the second line section 8 is arranged in the parabolic trough 52.
  • Line section 12 designed as a steam separator 60.
  • the resource i.e. the liquid-vapor mixture, after flowing through the collector 54, is fed directly into the vapor separator 60 via the third line section 10 for processing.
  • other devices for storing and processing the operating fluid can be used instead of the steam separator 60.

Landscapes

  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Sustainable Development (AREA)
  • Sustainable Energy (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Engine Equipment That Uses Special Cycles (AREA)

Abstract

La centrale solaire (2) selon l'invention comprend au moins un conduit absorbeur (6) servant à guider et à chauffer une substance d'exploitation, en particulier de l'eau. Ce conduit absorbeur (6) comprend au moins un premier et un second tronçon (8, 12) qui sont disposés sensiblement horizontalement. Entre le premier (8) et le second tronçon de conduit (12), est disposé un troisième tronçon de conduit (10). Le niveau (14) de ce troisième tronçon est plus haut que le niveau maximum (16, 18) respectif de l'espace intérieur (20, 22) du premier (8) et du second tronçon de conduit (12). Ainsi, une surchauffe de la paroi est, dans une large mesure, évitée dans la zone supérieure du conduit absorbeur (6).
PCT/DE1998/000416 1997-02-26 1998-02-13 Centrale solaire, en particulier centrale solaire a canaux paraboliques Ceased WO1998038457A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19707701 1997-02-26
DE19707701.3 1997-02-26

Publications (1)

Publication Number Publication Date
WO1998038457A1 true WO1998038457A1 (fr) 1998-09-03

Family

ID=7821554

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/DE1998/000416 Ceased WO1998038457A1 (fr) 1997-02-26 1998-02-13 Centrale solaire, en particulier centrale solaire a canaux paraboliques

Country Status (2)

Country Link
MA (1) MA24487A1 (fr)
WO (1) WO1998038457A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102007048745A1 (de) * 2007-10-08 2009-04-09 Senior Berghöfer GmbH Vorrichtung zur Verbindung einer Festleitung mit einem Absorberrohr eines solarthermischen Kraftwerks
WO2010035064A1 (fr) 2008-09-23 2010-04-01 Capan Rahmi Oguz Système de miroirs cylindro-paraboliques de champ
WO2012110332A1 (fr) * 2011-02-17 2012-08-23 Siemens Aktiengesellschaft Ligne de collecteurs solaires pour un générateur de vapeur continu solaire

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2800439A1 (de) * 1978-01-05 1979-07-12 Spilling Heinz Dipl Ing Sonnenkollektor

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2800439A1 (de) * 1978-01-05 1979-07-12 Spilling Heinz Dipl Ing Sonnenkollektor

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102007048745A1 (de) * 2007-10-08 2009-04-09 Senior Berghöfer GmbH Vorrichtung zur Verbindung einer Festleitung mit einem Absorberrohr eines solarthermischen Kraftwerks
WO2009047248A1 (fr) * 2007-10-08 2009-04-16 Senior Berghöfer GmbH Dispositif permettant de raccorder un tube fixe à un tube absorbeur d'une centrale héliothermique
DE102007048745B4 (de) * 2007-10-08 2017-04-20 Senior Flexonics Gmbh Vorrichtung zur Verbindung einer Festleitung mit einem Absorberrohr eines solarthermischen Kraftwerks
WO2010035064A1 (fr) 2008-09-23 2010-04-01 Capan Rahmi Oguz Système de miroirs cylindro-paraboliques de champ
US20110168161A1 (en) * 2008-09-23 2011-07-14 Rahmi Oguz Capan Solar Trough Field System
WO2012110332A1 (fr) * 2011-02-17 2012-08-23 Siemens Aktiengesellschaft Ligne de collecteurs solaires pour un générateur de vapeur continu solaire

Also Published As

Publication number Publication date
MA24487A1 (fr) 1998-10-01

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