Classifications

• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
  • F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
  • F01K13/00—General layout or general methods of operation of complete plants
  • F01K13/02—Controlling, e.g. stopping or starting
• • 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
  • F03G6/067—Binary cycle plants where the fluid from the solar collector heats the working fluid via a heat exchanger
• • 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
  • F03G6/071—Devices for producing mechanical power from solar energy with energy storage devices
• • 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 present invention relates to a method for starting a steam turbine of a solar power plant, in particular ⁇ re a parabolic trough power plant.
• Starting methods for steam turbines of solar power plants are known in principle.
• solar power plants in particular ⁇ in the form of parabolic trough power plants, solar generator units.
• these solar generator units are parabolic mirrors which have a pipeline for a thermal oil in their fuel line area. In this focal line, the heat ⁇ carrier oil is heated in sunlight and then brought via a heat exchanger with water or steam in combination.
• Superheated steam is generated by heat transfer, which drives a steam turbine of the solar power plant in ⁇ in egg nem steam cycle.
• Insbesonde ⁇ it is an object of the present invention to provide a method for starting a steam turbine of a solar power station is available, in which in a cost effective and simple manner, the preheating of the steam turbine may be performed.
• An inventive method for starting a steam turbine of a solar power plant, in particular a parabolic trough power plant comprises the following steps:
• Heating at least one component of the steam turbine which comes into contact with superheated steam during operation of the steam turbine, with the heat provided, starting the steam turbine after heating.
• heat is actively provided in a method according to the invention during and / or before starting the steam turbine.
• preheating of the relevant components namely those components which come into contact with superheated steam during operation of the steam turbine, is carried out.
• the subsequent start-up process ie in particular the individual steps of such a start-up process, or the application of live steam, can be carried out much faster or earlier.
• the provision of heat and the preheating by a process according to the invention can be carried out in particular before the sun- be performed, so that essentially directly from the beginning of a usable solar radiation intensity and a power-generating operation of the steam turbine can be performed.
• the components which are to be preheated in particular valves, for example, quick-closing valves or fresh steam valves, the housing, the shaft or the turbine blade of the steam turbine.
• a method according to the invention can be further developed in that the step of heating at least one of
• Component of the steam turbine takes place with rotating turbine blades of the steam turbine.
• the rotational speed of the turbine blades is less than 5%, in particular less than 1%, of the maximum rotational speed of the turbine blades during operation of the steam turbine.
• Rotating the turbine blades in this preheating stage produces little or no vapor flow. Rather insbesonde ⁇ re, are actively moving the turbine blades, so that a more advantageous heat equalization can take place within the turbine blades during preheating.
• rotating the turbine blades serves to preheat all areas of the turbine blade substantially uniformly from a heat medium by the heat provided. It is also advantageous when the turbine blades at an active inventive method ⁇ SEN during preheating, in particular motor-driven is.
• an electric motor can be provided.
• a connected generator of the steam turbine can also be used as an electric motor by appropriate control.
• This can be provided by a solar generator unit of the solar power plant.
• the heat provided can be provided directly from the solar power plant, namely a solar generator unit. External connections relationship ⁇ separate heat generator can be avoided in this way.
• a method according to the invention can preferably be used in already existing solar power plants.
• the hot steam for example, in the use of edge times in the course of a day, ie in particular shortly after sunrise or shortly before sunset take place.
• the solar radiation intensity ⁇ still not sufficient to provide a steam quality with the ⁇ not agile operating parameters for the steam turbine for power generation available.
• the heat generated may be used to preheat the component (s).
• the superheated steam can be provided directly or indirectly for such heating.
• An indirect transfer is conceivable, for example via a heat transfer oil. It is also advantageous if in an inventive
• the heat from at least one heat storage of the solar power plant is provided.
• Such Wär ⁇ meatorium can in particular serve for buffering, so that it can be started regardless of when the storage of heat at any desired timing of the start-up process by preheating the steam turbine.
• This memory can be charged both internally and externally.
• An internal charging is preferably carried out with heat, which is available within the system of the solar power plant, for example by the generated steam or the heat generated by solar generator units.
• Using a memory allows you to pre-heat before sunrise. So that the service life of a steam turbine can even closer to the sunrise out be postponed ben so that up to 1.5 hours of extra usage ⁇ life every day are possible.
• the at least one heat accumulator is charged by a solar generation unit of the solar power plant with a method according to the invention ⁇ SEN.
• a direct or indirect charge is possible.
• the charge can be understood with heated thermal oil.
• An indirect charge is, for example, the production of superheated steam, which is then stored in a heat accumulator.
• the heat accumulator is in each case in fluid-communicating connection with the corresponding circuit, that is to say the heat-transfer oil circuit or the superheated steam circuit.
• the at least one heat storage for storing a heat transfer medium, in particular a heat transfer oil ⁇ formed in a process according to the invention ⁇ SEN may be advantageous if the at least one heat storage for storing a heat transfer medium, in particular a heat transfer oil ⁇ formed in a process according to the invention ⁇ SEN. This can be achieved in particular a particularly compact design, since a direct connection of this heat storage can be made to the heat transfer oil circulation.
• the formed at least a heat storage for storing superheated steam at a SEN according to the invention may in particular ⁇ sondere with such a circuit to interface form a part of the cycle of live steam relationship ⁇ as superheated steam respectively.
• a memory is for example a steam storage.
• At least part of the heat provided for keeping warm overnight is at least one component of the steam turbine, which comes into contact during operation of the steam turbine with superheated steam used in an inventive ⁇ SEN embodiment of the method is.
• This allows a complete cooling of the steam turbines ⁇ ne, in particular the relevant components are avoided.
• the warming is preferably not yet at operating temperature, which is necessary for the startup or operation of the steam turbine. Much more is kept warm at a temperature which prevents complete cooling down and at the same time is low enough so that heat losses in to a large extent be prevented ⁇ overnight ver.
• the duration of the preheating process lusterswei- se the duration of the start is education process further reduced by such From ⁇ .
• the heat is used in an inventive ⁇ SEN method the provision of heat, in particular for charging a heat storage, which is generated by a solar generator unit in the usage ⁇ off-peak times, in particular shortly after sunrise or before sunset ,
• use of off-peak times are defined by the fact that these tongue solar radiation intensity Zung periods not enough ⁇ to take the steam turbine in operation.
• energy or heat is already generated, so that storage and the collection of this heat can take place for the method according to the invention.
• this embodiment of the method in combination with a heat storage as has already been explained forms for different ⁇ embodiments, performed.
• FIG. 1 shows a first embodiment of a solar power plant for carrying out a method according to the invention
• FIG. 2 shows a further embodiment of a solar power plant for carrying out a method according to the invention
• Figure 3 shows a possibility of the use situation of the solar radiation intensity in a method according to the invention
• Figure 4 is a representation of a steam turbine for a method according to the invention.
• FIGS. 1 and 2 show two variants of solar power plants 100. In both cases, it is a parabolic trough power plant with a large number of individual parabolic troughs, each of which forms a solar generator unit 20.
• FIG. 3 shows a typical usage situation.
• the solar radiation intensity after sunrise increas ⁇ men rise above the day and fall back to the sunset out.
• the useful lives have already a solar radiation intensity, which, however, is still not sufficient to provide sufficient live steam for the operation of the steam turbine 10 available.
• a warm-up of the steam turbine 10. takes place takes this warm-up and start-up in known steam turbines for so long that even possible useful life of the steam turbine in which enough energy provided by solar radiation intensity is available is lost to operate the Dampftur ⁇ bine 10 to be able to.
• heat is provided Availability checked ⁇ supply to shorten the start-up process by preheating the steam turbine 10 even further and thus overall system to improve the overall.
• the preheating of components of the steam turbine 10 relates in particular to the turbine blades ⁇ 12, the housing 16 and / or valves 14, as shown for example in Fig. 4.
• the turbine blades 12 can rotate during the preheating, in particular via a generator 18, which is controlled as Elektromo ⁇ gate, are moved.
• FIG. 2 according to an illustration, two different alternatives or combinations of operable embodiments of a solar power plant 100 for a method according to the invention are shown. They are characterized in that two heat storage 30 are provided.
• the upper left heat storage 30 is connected in fluid communication with the circulation of the heat transfer oil.
• the heat storage 30 at the bottom right is connected to the superheated steam cycle to the steam turbine 10.
• Both heat accumulators 30 serve to be able to store heat in order to provide heat for the preheating of individual components of the steam turbine 10 for a method according to the invention.
• a corresponding heat storage medium, ie heat transfer oil or superheated steam can be stored.
• integration into the system of the solar power plant 100 is done so that an internal charging by heat which is provided by the solar Ergneereinhei ⁇ th 20 available, can be carried out.

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

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• 2012
  • 2012-01-19 DE DE102012200769A patent/DE102012200769A1/de not_active Withdrawn
  • 2012-12-14 WO PCT/EP2012/075558 patent/WO2013107575A2/fr not_active Ceased
  • 2012-12-14 EP EP12810187.0A patent/EP2769094A2/fr not_active Ceased

Non-Patent Citations (1)

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