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
  • F01K13/006—Auxiliaries or details not otherwise provided for
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F22—STEAM GENERATION
  • F22D—PREHEATING, OR ACCUMULATING PREHEATED, FEED-WATER FOR STEAM GENERATION; FEED-WATER SUPPLY FOR STEAM GENERATION; CONTROLLING WATER LEVEL FOR STEAM GENERATION; AUXILIARY DEVICES FOR PROMOTING WATER CIRCULATION WITHIN STEAM BOILERS
  • F22D3/00—Accumulators for preheated water
• • 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
  • F01K3/00—Plants characterised by the use of steam or heat accumulators, or intermediate steam heaters, therein
  • F01K3/14—Plants characterised by the use of steam or heat accumulators, or intermediate steam heaters, therein having both steam accumulator and heater, e.g. superheating accumulator
  • F01K3/16—Mutual arrangement of accumulator and heater
• • 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
  • F01K7/00—Steam engine plants characterised by the use of specific types of engine; Plants or engines characterised by their use of special steam systems, cycles or processes; Control means specially adapted for such systems, cycles or processes; Use of withdrawn or exhaust steam for feed-water heating
  • F01K7/16—Steam engine plants characterised by the use of specific types of engine; Plants or engines characterised by their use of special steam systems, cycles or processes; Control means specially adapted for such systems, cycles or processes; Use of withdrawn or exhaust steam for feed-water heating the engines being only of turbine type
• • 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
  • F01K9/00—Plants characterised by condensers arranged or modified to co-operate with the engines
• • 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
  • F03G6/003—Devices for producing mechanical power from solar energy having a Rankine cycle
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F22—STEAM GENERATION
  • F22D—PREHEATING, OR ACCUMULATING PREHEATED, FEED-WATER FOR STEAM GENERATION; FEED-WATER SUPPLY FOR STEAM GENERATION; CONTROLLING WATER LEVEL FOR STEAM GENERATION; AUXILIARY DEVICES FOR PROMOTING WATER CIRCULATION WITHIN STEAM BOILERS
  • F22D11/00—Feed-water supply not provided for in other main groups
  • F22D11/02—Arrangements of feed-water pumps
• • 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

• auxiliary steam is required, for example, in the case of a standstill for pressure maintenance or for keeping the feedwater tank warm, as well as for steaming the steam turbine.
• the steam which can be generated by the actual steam generation process can under certain circumstances be used for the
• auxiliary steam generators are integrated in the water-steam circuit of the conventional power plant according to the prior art.
• auxiliary steam generators are fossil-fired boilers, so-called auxiliary steam boilers. They are usually operated with gas or oil, or with other fossil fuels.
• Such auxiliary steam generator provide in the construction of power plants, in particular by the complex and complex circuit of the auxiliary steam generator in the water-steam -
• auxiliary steam generators are provided in particular for the special operation, they are not required in normal operation of the power plant, but still cause running costs or efficiency losses, as they are electrically, or via steam from the water-steam cycle the power plant must be kept warm. They also cause regular and not insignificant maintenance costs.
• the object of the invention is to provide an auxiliary steam generator system, by which the disadvantages of the prior art are avoided, and can be reduced drastically, especially the installation costs.
• auxiliary steam generator system for a power plant comprising a water-steam cycle with a condensate line, wherein in the condensate line a condensate pump and in the feed water line a feedwater pump are connected. Furthermore, see in the lines between the condensate pump and the feedwater pump, a pressure storage tank connected, and connected to the pressure storage tank to the water-steam cycle at a branch point, a feedwater discharge line. According to the invention, the feedwater discharge line is now connected to the pressure storage container, and a heating device is connected in the feedwater withdrawal line.
• the feedwater tank of the power plant As a pressure storage tank, the feedwater tank of the power plant is provided, which thus fulfills the function of storing condensate or feed water for the water-steam cycle, and also to supply steam or saturated steam for the supply of the power plant with auxiliary steam.
• the heating device is designed so that the feed water can be heated by this, so that steam can be generated in the pressure storage container after corresponding reduction in pressure.
• the feedwater tank is designed as a thermal store ("Ruths store"), for which purpose the feedwater tank may be designed to be larger, in accordance with the increased requirements, than without the function of additional pressure storage
• Ruths store thermal store
• the feedwater tank may be designed to be larger, in accordance with the increased requirements, than without the function of additional pressure storage
• the stored in the accumulator tank steam can also be used advantageously for the supply of auxiliary steam consumers.
• the power plant comprises further auxiliary steam consumers, the pressure storage tank being connected to the auxiliary steam consumers via a steam line.
• the steam parameters in the pressure storage tank are adjusted accordingly to the auxiliary steam consumers to be supplied.
• the setting is made by means of heating, condensate feed or feedwater pump, and / or throttle valves.
• a pressure-holding valve connected by which the pressure between the heater and the pressure-holding valve is increased so far that the operating pressure is sufficiently far from the vapor pressure of the medium at the respective operating temperature.
• the feedwater discharge line is connected to the condensate line of the water-steam cycle, and in the feedwater discharge line upstream of the heating device, a circulation pump is connected.
• the circulation pump Through the circulation pump, the steam parameters can be adjusted indirectly through the flow rate, the heating and according to the Druckreduzierventil thoroughly.
• the feedwater discharge line is connected to a removal point of the feed pump or behind the feedwater pump. This requires specially configured feedwater pumps.
• the heating device is electric.
• the invention makes it possible, in particular, to reduce the installation costs of a power station, since an otherwise expensive and expensive auxiliary steam generator can be dispensed with by using an electrically heated heating device for the auxiliary steam generator. If the invention is used in a solar power plant, the use of an electric heating device can result in a completely "regenerative energy production.” Since the electrically heated heating device operates without emissions, a lower licensing cost for solar power plants can be expected Auxiliary steam generation does not require a fuel system for storing and distributing the fuel.
• the auxiliary steam generator system is advantageously used in a gas and steam turbine power plant. But in other fossil-fired steam power plants, the advantages the auxiliary steam generator system can be used. Particularly advantageous is the auxiliary steam generator system in a CSP (Concentrating Solar Power) steam power plant with solar heated steam generation used.
• CSP Concentrating Solar Power
• the object of the invention directed to a process for auxiliary steam generation is solved by the features of process claim 9.
• the process for auxiliary steam generation in a power plant process thereby provides a reservoir connected in a water-steam cycle, into the condensate from the water vapor Cycle is promoted.
• the condensate is stored in the memory, mixed and degassed, and then discharged as feed water from the memory, and subtracted a partial flow of the discharged feedwater.
• the partial flow is then heated in a heating process, and fed back into the storage.
• the storage tank corresponds to a collection tank for feedwater, in which a volume of liquid for the water-steam cycle can be temporarily stored.
• the collection tank also serves as a buffer for the feed water.
• the partial flow is heated to temperatures at a sufficient distance below the boiling point or above the boiling point.
• the return of the heated partial flow into the reservoir increases the pressure in the reservoir.
• the accumulator can also be used as an accumulator for process steam.
• the process according to the invention in particular the installation costs of a power plant process, can be reduced.
• the auxiliary steam generation process can be realized much less complex by the method according to the invention.
• steam is withdrawn from the storage tank and fed to an auxiliary steam process of the power plant process.
• the steam can be generated by various methods.
• the partial flow of the feedwater is first heated in the heating process to just below the boiling point of the feedwater, and promoted and evaporated in the memory under the relaxation of the feedwater.
• the distance of the temperature to which the feed water is heated up to the boiling point is sufficiently large, so that there is still no evaporation prior to introduction into the memory. It is advantageous if the heated feed water is conveyed by a pumping process in the memory.
• the pumping process consists in particular of a circulation pump and possibly valves.
• the partial flow of feed water is heated in the heating process to the boiling point or boiling point of the feed water, forming steam under pressure build-up and promoting the steam in the reservoir utilizing the density difference between steam and feed water.
• On an additional pump can be omitted here.
• the method for auxiliary steam generation is advantageously operated when the power plant is in non-stationary operating states at standstill or in partial load operation or in startup / shutdown operation in order to supply the power plant process with sufficient auxiliary steam.
• the power plant process preferably comprises a gas and steam turbine process with a water-steam cycle, the process is integrated for auxiliary steam generation in the water-steam cycle of the gas and steam turbine process.
• the power plant process is a CSP steam power plant process with a solar heated steam generation process, with the process of auxiliary steam generation integrated into the water-steam cycle of the CSP steam power plant process.
• 1 shows an auxiliary steam generator system for a power plant
• 2 shows a process for auxiliary steam generation for a
• an auxiliary steam generator system 1 is shown, as it may be integrated into a fossil-fueled power plant or a solar power plant.
• the power plant comprises a water-steam cycle 2 of which only the section of the condensate line 3 is shown here.
• condensate line 3 are essentially a condensate pump 4, a pressure storage tank 6 and in the feed water pipe 16 is a feedwater pump 5 is connected.
• condensate pump 4 condensate is conveyed into the pressure storage tank 6.
• the condensate is degassed, mixed and stored before it is pumped through the feedwater pump 5 back in through the feedwater line 16 into the water-steam cycle 2.
• a feedwater discharge line 8 is now provided which is connected at a branching point 7 to the feedwater line 16 between the pressure storage container 6 and the feedwater pump 5.
• the feedwater discharge line device 8 is connected directly to the feedwater pump 5 or after the feedwater pump 5.
• the feedwater discharge line 8 connects the feedwater line 16 to the accumulator tank 6.
• a circulation pump 13 and a heating device 9 are essentially connected in the feedwater discharge line 8. By the heater 9, the withdrawn partial flow of the feedwater is heated.
• valves for controlling the partial flow are connected in the feedwater discharge line 8.
• a pressure valve 12 is connected, by which the pressure in the accumulator tank is kept adjustable.
• a steam line 11 is connected to the discharge of steam.
• the steam line 11 connects the accumulator tank 6 with a Hilfsdampf- consumer 10.
• a motor or pneumatically operated control valve is connected for controlling or throttling of steam is in the steam line 11.
• the auxiliary steam consumers thus obtain the required auxiliary steam exclusively from the pressure storage tank 6.
• the section of the condensate line 3 of the water-steam cycle 2 also has a compensation line 15, which the condensate the portion 3 of the condensate between the condensate 4 and the accumulator tank 6 with the portion of the feedwater discharge line 8 between the accumulator tank 6 and the circulation pump thirteenth combines.
• a motor or pneumatically operated control valve may be connected in the compensation line.
• FIG. 2 shows a method for auxiliary steam generation, as it may be integrated into a fossil-fueled power plant process or a solar power plant process. Shown here is a section of the water-steam circuit 2 for feed water 24 in the form of condensate 23, as obtained after condensation in the power plant process.
• the method essentially comprises a reservoir 22 and a heating process 26.
• the reservoir 22 is first supplied with condensate 23 from the water-steam circuit 2.
• the condensate 23 and feed water 24 is stored, mixed and degassed. It is then discharged again and passed into the water-steam circuit 2 for evaporation.
• a partial stream 25 is now withdrawn, and fed to the heating process 26.
• the feedwater 24 is heated and returned to the reservoir 22.
• a pumping process 29 is provided in order to convey the partial flow 25 back into the storage 22.

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

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• 2012
  • 2012-12-04 CN CN201280066966.4A patent/CN104302975B/zh not_active Expired - Fee Related
  • 2012-12-04 US US14/372,223 patent/US9494054B2/en not_active Expired - Fee Related
  • 2012-12-04 EP EP12809644.3A patent/EP2791576A2/de not_active Withdrawn
  • 2012-12-04 WO PCT/EP2012/074333 patent/WO2013107557A2/de active Application Filing
  • 2012-12-04 KR KR1020147019879A patent/KR20140123048A/ko active IP Right Grant
  • 2012-12-04 JP JP2014552537A patent/JP6069359B2/ja not_active Expired - Fee Related

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