EP2589764A1 - Centrale dotée d'une turbine à vapeur équipée d'un éjecteur de démarrage et procédé de démarrage d'une centrale dotée d'une turbine à vapeur - Google Patents

Centrale dotée d'une turbine à vapeur équipée d'un éjecteur de démarrage et procédé de démarrage d'une centrale dotée d'une turbine à vapeur Download PDF

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Publication number
EP2589764A1
EP2589764A1 EP11187839.3A EP11187839A EP2589764A1 EP 2589764 A1 EP2589764 A1 EP 2589764A1 EP 11187839 A EP11187839 A EP 11187839A EP 2589764 A1 EP2589764 A1 EP 2589764A1
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EP
European Patent Office
Prior art keywords
steam
condenser
steam turbine
power plant
jet pump
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.)
Withdrawn
Application number
EP11187839.3A
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German (de)
English (en)
Inventor
Uwe Juretzek
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
Original Assignee
Siemens AG
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 filed Critical Siemens AG
Priority to EP11187839.3A priority Critical patent/EP2589764A1/fr
Publication of EP2589764A1 publication Critical patent/EP2589764A1/fr
Withdrawn legal-status Critical Current

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    • 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
    • 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
    • F01K9/02—Arrangements or modifications of condensate or air pumps

Definitions

  • the invention relates to a power plant and a method for starting a power plant, in which using a Anfahrstrahlers the steam turbine condenser is evacuated faster.
  • auxiliary steam For starting up power plants, in which a steam turbine is integrated, auxiliary steam is needed in most cases.
  • This auxiliary steam serves to provide sealing steam for the shaft seals of the steam turbine, for steaming of the feedwater tank or bypass degasser, etc.
  • This auxiliary steam necessary for starting is often generated by means of a separate gas or oil-fired auxiliary steam generator (HIDE).
  • HIDE gas or oil-fired auxiliary steam generator
  • This steam generator (including ancillary systems, such as storage and treatment of the fuel, water supply, etc.) requires not only capital expenditures and operating expenses, such as fuel, etc., but also regular maintenance and costs the plant operator millions of dollars.
  • the starting process can be done without auxiliary steam generator.
  • the generated steam of the high pressure boiler is fed into the auxiliary steam system and thus the evaporation of the shaft seals of the steam turbine, the feedwater tank, etc. ensured.
  • the steam which is not required for this purpose is blown over the roof by means of the starting valves until a corresponding vacuum has been drawn in the condenser, which makes it possible to introduce the steam via the diverting stations.
  • This solution is much cheaper than the solution with auxiliary steam generator from the capital expenditure, but has the disadvantage That the starting times and the water consumption of the power plant and the associated costs for fuel, chemicals, raw water, etc., increase sharply and also the possible uses in a liberalized market (due to the requirement of short start times) are generally very limited.
  • This solution is therefore used only under certain boundary conditions, such as in the presence of an alternative supply from a fed by other systems process / auxiliary steam network and a concomitant low likelihood of the Anfahrventile.
  • the ever increasing trend towards environmentally friendly solutions with low water consumption is another point that often prohibits the use of this solution.
  • the invention solves the task directed to the power plant by using, in a power plant comprising a steam turbine, a steam generator, i. a boiler or heat recovery steam generator, a vapor system arranged between boiler or heat recovery steam generator and steam steam generator, and a steam turbine condenser, provides that a jet pump for evacuating the steam turbine condenser on the suction side with the steam turbine condenser and on the drive side with the auxiliary steam system or directly with connected to the steam system.
  • a steam turbine i. a boiler or heat recovery steam generator, a vapor system arranged between boiler or heat recovery steam generator and steam steam generator, and a steam turbine condenser
  • the first steam generated in the startup process in the boiler / heat recovery steam generator is via a corresponding Umleitstation (which conditions him accordingly, ie possibly necessary pressure and temperature adjustment by throttling and water injection) directly from the high pressure steam system (in boilers without reheating) or from the reheate (For boilers with reheat, which between-overheated the relaxed high-pressure steam at medium pressures) fed into the auxiliary steam system and provides the steam for steaming the shaft seals, etc. available. If the temperature of the steam for steaming the shaft seals at the beginning should not be sufficiently high, the temperature of this partial mass flow is increased accordingly within the auxiliary steam system by means of electric superheater.
  • the steam which is not required for the vaporization of the shaft seals, etc. will now be sent via the steam system or the auxiliary steam system as motive steam for an additional starting radiator, i. a steam-driven jet pump, which is only in operation during the start-up, made available, with the help of which the necessary condenser vacuum for opening the Dampfumleitstationen is achieved much faster.
  • a steam-driven jet pump which is only in operation during the start-up, made available, with the help of which the necessary condenser vacuum for opening the Dampfumleitstationen is achieved much faster.
  • the jet pump is installed in addition to the evacuation equipment required for normal operation, and the evacuation facilities (e.g., water ring pumps) necessary for normal operation are usefully also operational for the rapid evacuation of the steam turbine condenser.
  • evacuation facilities e.g., water ring pumps
  • the start-up radiator is designed specifically for achieving the vacuum required for opening the diverter stations (i.e., achieving the minimum necessary pressure reduction) and not for the high vacuum required in normal operation to allow for possible rapid evacuation to that point.
  • the Anfahrstrahler is such that it can use / deduce the entire excess steam (taking into account the amounts of injection water) until the diverter to the steam turbine condenser opens without the pressure in the boiler rises inadmissible and continue the necessary flow through the superheater heating surfaces in the boiler is ensured.
  • the Anfahrstrahler is designed so that an unhindered startup of the steam power of the high pressure part of the boiler is possible.
  • the size of the usable excess steam depends not only on the shaft steam consumption but also on any other auxiliary steam consumers (for example feed water tank), which should only be supplied after the design driving steam mass flow for the starting lamp has been reached.
  • the air / vapor mixture leaving the Anfahrstrahler is either released into the environment, which means a corresponding loss of water, only that this is much lower than the Anfahrventilaims because of the shorter duration until the necessary vacuum is made in the steam turbine condenser and open the Umleitstationen can, or it is advantageously discharged via a further condenser to the environment, which further reduces the loss of water.
  • the further condenser of the jet pump is connected downstream.
  • the capacitor which may be connected downstream of the starting lamp, can be designed as a surface capacitor or as an injection capacitor.
  • the design as injection capacitor would have the advantage of a particularly simple and inexpensive construction, especially if only the pipe for the discharge of the air / steam mixture is dimensioned slightly larger and the injection water is distributed accordingly.
  • the further condenser is connected to a condensate collector of the steam turbine condenser for cooling the further condenser by condensate from the steam turbine condenser receiver.
  • the condensate in the condensate receiver hotwell is heated and thus a better degassing in the steam turbine condenser and thus a faster start-up because steam cleaning conditions are reached faster.
  • the further condenser is connected to a circulating water line for cooling the further condenser with circulating water. Advantages also result in better degassing in the condenser and a faster start-up.
  • a control valve in the steam system in front of the jet pump for controlling the motive steam is arranged.
  • a shut-off valve with a sealing water connection is arranged on the suction side of the jet pump. It also takes over the function of a pressure relief for the steam turbine condenser, if the drains from the steam cycle are passed directly to the steam turbine condenser and thus prevents the uncontrolled escape of steam in the steam turbine.
  • this steam can be fed into the auxiliary steam system via a diverter station which conditions it accordingly.
  • Conditioning means possibly a necessary pressure and temperature adjustment by throttling and water injection.
  • the air / steam mixture in the further condenser heats a cycle additive water.
  • the jet pump is operated only during the startup process of the power plant.
  • This invention eliminates the need for the auxiliary boiler and the associated high investment and operating costs.
  • the advantage in Invest also applies when using the optional capacitor; the water consumption is then in the same order of magnitude (residual steam losses from the condenser vs. HIDE-blowdown), without a condenser it can be assumed that water consumption will increase. If the vacuum in the steam turbine condenser has been broken, the start-up time is always shorter, if not, it is usually assumed that there is an extension.
  • the use of the simple, maintenance-free start-up radiator also improves the availability of the entire system in comparison to the complex auxiliary boiler solution. since, in the absence of an alternative auxiliary steam source, unavailability of the HIDE generally also results in unavailability of the entire system.
  • downstream capacitor can, despite the increased investment, be quite advantageous because the cost of water treatment and their operation can be further reduced and at the same time environmental laws can be easily met.
  • downstream condenser a further start time reduction of the entire system with appropriate fuel savings, since in addition to the shortened evacuation period, the condensate or the circuit auxiliary water is heated and thus the degassing is improved in Dampfurbinenkondensatorhotwell and thus the purity conditions for steam turbine operation can be achieved faster.
  • FIG. 1 shows schematically and by way of example a section of a power plant 1 according to the invention.
  • Steam generated in the high-pressure steam boiler / high-pressure section of the heat recovery steam generator (not shown) is fed into the auxiliary steam system 4 via a corresponding steam system 2 and a diverter station 3.
  • This steam is provided as motive steam for the starting radiator 5, ie a steam-driven jet pump, which is connected on the suction side to the steam turbine condenser 6 and on the drive side to the auxiliary steam system 4.
  • the necessary for the normal operation of the steam turbine condenser 6 evacuation means 7, for example, water ring pumps 7, are also in operation.
  • the air / vapor mixture which leaves the Anfahrstrahler 5, discharged via a further capacitor 8 to the environment.
  • the further condenser 8 may be embodied as an injection condenser and is cooled by condensate from the condensate collecting tank of the steam turbine condenser 6, which is provided via a condensate pump 9 and an injection water supply line 10. Alternatively or additionally, the cooling of the further condenser 8 can also take place with water from the circulating auxiliary water line 11.
  • the Anfahrstrahler 5 has a control valve 12 for the motive steam and a shut-off valve 13 with a sealing water connection. The Anfahrstrahler 5 is when starting the power plant 1 as long as in operation until a necessary for opening the Umleitstation 21 vacuum in the steam turbine condenser 6 is reached.
  • the jet pump 5 comprises a drive side 14, a suction side 15 and a pressure side 16.
  • the jet pump 5 is connected with its drive side 14 in the auxiliary steam system 4, so that steam 18 exits the drive nozzle 17 at high speed and air 19 from the steam turbine condenser 6, which is connected to the suction side 15, entrains, wherein an air / vapor mixture 20 is formed, which is discharged via the pressure side 16.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Engine Equipment That Uses Special Cycles (AREA)
EP11187839.3A 2011-11-04 2011-11-04 Centrale dotée d'une turbine à vapeur équipée d'un éjecteur de démarrage et procédé de démarrage d'une centrale dotée d'une turbine à vapeur Withdrawn EP2589764A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP11187839.3A EP2589764A1 (fr) 2011-11-04 2011-11-04 Centrale dotée d'une turbine à vapeur équipée d'un éjecteur de démarrage et procédé de démarrage d'une centrale dotée d'une turbine à vapeur

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP11187839.3A EP2589764A1 (fr) 2011-11-04 2011-11-04 Centrale dotée d'une turbine à vapeur équipée d'un éjecteur de démarrage et procédé de démarrage d'une centrale dotée d'une turbine à vapeur

Publications (1)

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EP2589764A1 true EP2589764A1 (fr) 2013-05-08

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EP11187839.3A Withdrawn EP2589764A1 (fr) 2011-11-04 2011-11-04 Centrale dotée d'une turbine à vapeur équipée d'un éjecteur de démarrage et procédé de démarrage d'une centrale dotée d'une turbine à vapeur

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB234581A (en) * 1924-03-27 1925-06-04 English Electric Co Ltd Improvements in steam turbine power plant
WO2001059265A1 (fr) * 2000-02-09 2001-08-16 Siemens Aktiengesellschaft Procede et dispositif permettant de produire le vide dans le condensateur de turbine
US20050034445A1 (en) * 2003-08-12 2005-02-17 Washington Group International, Inc. Method and apparatus for combined cycle power plant operation

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB234581A (en) * 1924-03-27 1925-06-04 English Electric Co Ltd Improvements in steam turbine power plant
WO2001059265A1 (fr) * 2000-02-09 2001-08-16 Siemens Aktiengesellschaft Procede et dispositif permettant de produire le vide dans le condensateur de turbine
US20050034445A1 (en) * 2003-08-12 2005-02-17 Washington Group International, Inc. Method and apparatus for combined cycle power plant operation

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