EP0929737B1 - Dampfturbine mit kondensator sowie verfahren zur kühlung einer dampfturbine im ventilationsbetrieb - Google Patents

Dampfturbine mit kondensator sowie verfahren zur kühlung einer dampfturbine im ventilationsbetrieb Download PDF

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Publication number
EP0929737B1
EP0929737B1 EP97943765A EP97943765A EP0929737B1 EP 0929737 B1 EP0929737 B1 EP 0929737B1 EP 97943765 A EP97943765 A EP 97943765A EP 97943765 A EP97943765 A EP 97943765A EP 0929737 B1 EP0929737 B1 EP 0929737B1
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EP
European Patent Office
Prior art keywords
steam
cooling
condenser
interior
steam turbine
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.)
Expired - Lifetime
Application number
EP97943765A
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German (de)
English (en)
French (fr)
Other versions
EP0929737A1 (de
Inventor
Hans-Joachim Endries
Claus Eggert
Hans Stein
Rolf-Dieter Koch
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
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Filing date
Publication date
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Publication of EP0929737A1 publication Critical patent/EP0929737A1/de
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
    • F01D25/00—Component parts, details, or accessories, not provided for in, or of interest apart from, other groups
    • F01D25/08—Cooling; Heating; Heat-insulation
    • F01D25/12—Cooling
    • 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
    • F01K13/025—Cooling the interior by injection during idling or stand-by

Definitions

  • the invention relates to a steam turbine with one of one Action steam through which the interior can flow and a condenser for condensing the action steam and a method for Cooling of a steam turbine, in particular a low-pressure steam turbine, in ventilation mode.
  • a reaction steam turbine is without in US Pat. No. 1,447,081 Condenser described in which a fluidic Connection via a bypass line between one and one Steam flow acted on line and an area between an idling high pressure and low pressure part is. A valve must be used to make this connection be opened.
  • the turbine is in particular a marine turbine, which is used for forward operation and is designed for reverse operation.
  • the turbine comprises a blade section an impulse section, a high pressure reaction section and one Low pressure reaction section.
  • the turbine has another additional pulse section, which is axially downstream of the low pressure reaction section is and acts on the same turbine shaft.
  • One in forward operation emerging from the low pressure reaction section Steam flow flows into the same exhaust pipe as one Steam flow through the pulse section for reverse operation.
  • the low pressure reaction section and the pulse section are therefore fluidly connected to one another for reverse operation connected.
  • a standing of the steam which is due to the rotation of the idling low pressure blades would cause the blades to heat up prevent is a bypass line leading from one chamber between high pressure and low pressure section to the exhaust pipe intended.
  • the valve is in this bypass line arranged, which closed during forward operation of the turbine must become.
  • EP 0 602 040 B1 discloses one Cooling low pressure steam turbine in ventilation mode, the rotor of the steam turbine being rotated without turning relaxing steam.
  • a ventilation operation comes for example in a multi-housing Turboset before, in front of a low-pressure steam turbine Possibility to derive the otherwise in the low pressure steam turbine to relaxing action steam in one Heating heat exchanger or the like is provided.
  • a cooling in ventilation mode according to EP 0 602 040 B1 by feeding steam into one between an inlet for the action steam to be relaxed and an outlet tapping of this steam.
  • the tap is for example connected to the vapor space of a condenser, wherein the amount of steam and / or feed supplied Condensate depending on one determined in the steam turbine Temperature value is regulated.
  • An injection at the inlet of the steam turbine can optionally lead to condensate in the area of the inlet agglomerated and blading due to surge formation the turbine is at risk. This is done by feeding in Avoid steam in a tap.
  • CH-A-238 206 describes a method for cooling a Condensing steam turbine at idle and a condensing steam turbine described. This is done according to the cooling process suggested the one used for cooling To conduct steam in a cycle. For this is the Condensation steam turbine with a connecting line between the capacitor and the insertion point of the Cooling steam designed so that steam from the condenser through the connecting line through the low pressure blades can be conveyed back into the steam chamber. The Steam absorbs the ventilation heat from these blades and is cooled again in the condenser.
  • Cooling the turbine in ventilation mode is particularly important advantageous because during ventilation operation There is a steam atmosphere in the turbine, the static pressure in the one with the low pressure steam turbine connected condenser prevailing pressure. The Turbine blades rubbing against this steam (ventilation) can lead to considerable heat development, causing the Turbine overheated and in extreme cases not permitted can be charged.
  • the object of the invention is to provide a steam turbine, which is easy and effective to cool in ventilation mode.
  • Another object of the invention is to provide a Method for cooling a steam turbine, in particular a low pressure steam turbine during a ventilation operation.
  • a shut-off device ensures the automatic onset of a flow of steam from the Condenser into the interior of the steam turbine, if the vapor pressure in the interior falls below a critical value, which takes place particularly in ventilation mode.
  • shut-off device If the vapor pressure in the condenser is higher than that in the interior opens the shut-off device the cooling steam line, while it at one the cooling steam line is closed in the interior at higher pressure holds.
  • a self-opening shut-off device can have a biasing element, for example a Closing spring, its closing force plus the pressure in the interior of the vapor pressure in the condenser for opening the Barrier must be surpassed.
  • the cooling steam line preferably opens into the interior upstream of the last row of guide vanes in front of an outlet for the action steam. This means that one is in ventilation mode forming steam flow in the condenser and the steam turbine remaining steam through the freely rotating Run blades of the steam turbine ensure that at least the last row of vanes, which is the strongest warmed, cooled. To continue effective cooling upstream guide vane rows can cause the cooling steam line also upstream of these rows of guide vanes to be cooled lead. It preferably opens before the penultimate one or third last row of guide vanes in the interior on. With a double-flow low-pressure steam turbine is for a corresponding cooling steam line is provided for each flood. The Cooling steam line can of course also be in an already flow into the existing tap.
  • the shut-off device is preferably designed so that it a differential vapor pressure of 0.02 bar to 0.06 bar, in particular at about 0.03 bar, the cooling steam line opens.
  • the Shut-off device is preferably depending on the location of the mouth Cooling steam line into the interior of the steam turbine adjustable so that it is at another predetermined differential vapor pressure the cooling steam line opens.
  • a method for cooling a Steam turbine in ventilation operation task thereby solved that in the presence of a predetermined pressure difference between steam in the interior of the steam turbine and in the capacitor a connecting the interior with the capacitor Cooling steam line through a self-opening shut-off device opened and thereby a circulation flow between Interior and capacitor is formed.
  • Fig. 1 shows in a longitudinal section a double-flow low-pressure steam turbine 1, which is part of a not shown Steam turbine plant is.
  • the steam turbine 1 has one Turbine shaft 9 on two sides of the steam turbine 1 arranged shaft bearings 11 is mounted.
  • the steam turbine 1 has an interior 3, in which the with a Turbine inner housing 17 connected guide blades 7 and the arranged with the turbine shaft 9 blades 10 are.
  • This evaporation nozzle 8 opens into a condenser largely surrounding the interior 3 4.
  • the condenser 4 is with the interior 3 via a cooling steam line 5 connected, in which an automatically opening shut-off device 6 is arranged.
  • the cooling steam line 5 opens upstream of the seen in the flow direction of the action steam 2 last Guide vane row 7a. It preferably opens between the penultimate guide vane row 7b and the third to last vane row 7c.
  • the cooling steam line 5 is for example as a pipe with a circular cross-section and a diameter of approximately 0.6 m.
  • the shut-off device 6 is designed that it is during normal power operation Steam turbine 1 keeps the cooling steam line 5 shut off.
  • the Turbine shaft 9 can continue to rotate (the so-called Ventilation operation before) so the shut-off 6 gives the Cooling steam line 5 free as soon as the steam pressure in the condenser 4 is larger than in the interior 3.
  • This is preferably for the opening of the shut-off device 6 necessary pressure difference between the interior 3 and the condenser 4 about 0.3 bar or fewer.
  • steam flows out of the Condenser 4 into the interior 3 and leads to a Cooling of the last turbine guide vane rows 7a, 7b, 7c, caused by friction on the remaining in the interior 3 Steam can be heated.
  • a circulation flow is formed of steam from the condenser 4 into the interior 3 and back into the capacitor 4.
  • Fig. 2 shows a cross section through a low pressure steam turbine 1 with a capacitor 4 and the interior 3 connecting cooling steam line 5.
  • the cooling steam line 5 is connected to a shut-off device 6, which has a valve opening 14, which during a power operation of the Steam turbine 1 is closed by a sealing element 12.
  • a shut-off device 6 which has a valve opening 14, which during a power operation of the Steam turbine 1 is closed by a sealing element 12.
  • Sealing element 12 and closing spring 13 are here via a piston rod 15 guided over bearings connected.
  • the closing force of the spring 13 causes that Sealing element 12 only opens the valve opening 14 when caused by the pressure in the condenser 4 on the sealing element 12 acting force by the prevailing in the interior 3 Pressure generated plus the closing force of the closing spring Exceeds 13. Due to the adjustability of the closing spring 13 can open the shut-off device 6 depending on the required Conditions for ventilation operation accordingly be adjusted. It is understood that others too self-opening shut-off devices, especially valves that are due to open a prevailing pressure difference can be.
  • the invention is characterized in that a connecting line between a condenser of a steam turbine and the interior of the steam turbine by an automatically opening one Valve is opened as soon as a predetermined pressure difference between the vapor atmosphere in the interior and the steam is present in the condenser. This is one Switching from power mode to ventilation mode the steam turbine automatically starts cooling the Steam turbine guaranteed.
EP97943765A 1996-09-26 1997-09-12 Dampfturbine mit kondensator sowie verfahren zur kühlung einer dampfturbine im ventilationsbetrieb Expired - Lifetime EP0929737B1 (de)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19639722 1996-09-26
DE19639722 1996-09-26
PCT/DE1997/002050 WO1998013587A1 (de) 1996-09-26 1997-09-12 Dampfturbine mit kondensator sowie verfahren zur kühlung einer dampfturbine im ventilationsbetrieb

Publications (2)

Publication Number Publication Date
EP0929737A1 EP0929737A1 (de) 1999-07-21
EP0929737B1 true EP0929737B1 (de) 2002-11-20

Family

ID=7807062

Family Applications (1)

Application Number Title Priority Date Filing Date
EP97943765A Expired - Lifetime EP0929737B1 (de) 1996-09-26 1997-09-12 Dampfturbine mit kondensator sowie verfahren zur kühlung einer dampfturbine im ventilationsbetrieb

Country Status (4)

Country Link
US (1) US6135707A (nl)
EP (1) EP0929737B1 (nl)
DE (1) DE59708782D1 (nl)
WO (1) WO1998013587A1 (nl)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU111580U1 (ru) * 2011-02-11 2011-12-20 Альстом Текнолоджи Лтд Выпускное устройство для модуля паровой турбины

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1447081A (en) 1920-12-20 1923-02-27 Westinghouse Electric & Mfg Co Turbine
CH238206A (de) * 1943-04-30 1945-06-30 Bbc Brown Boveri & Cie Verfahren zur Kühlung von Kondensations-Dampfturbinen im Leerlauf.
DE928346C (de) * 1952-03-22 1955-05-31 Licentia Gmbh Einrichtung, um eine Dampfturbine im Schleppbetrieb mittels Dampf aus dem Kondensator der Turbine zu kuehlen
US3173654A (en) * 1962-03-14 1965-03-16 Burns & Roe Inc Temperature control of turbine blades on spinning reserve turbines
JPH0678724B2 (ja) * 1986-04-25 1994-10-05 株式会社日立製作所 １軸コンバインドプラントにおける蒸気タービンのクーリング方法及びクーリング装置
DE4129518A1 (de) * 1991-09-06 1993-03-11 Siemens Ag Kuehlung einer niederbruck-dampfturbine im ventilationsbetrieb

Also Published As

Publication number Publication date
WO1998013587A1 (de) 1998-04-02
US6135707A (en) 2000-10-24
DE59708782D1 (de) 2003-01-02
EP0929737A1 (de) 1999-07-21

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