EP1030960A1 - Procede permettant de reguler rapidement la puissance d'une centrale thermique a vapeur et centrale thermique a vapeur - Google Patents

Procede permettant de reguler rapidement la puissance d'une centrale thermique a vapeur et centrale thermique a vapeur

Info

Publication number
EP1030960A1
EP1030960A1 EP98959765A EP98959765A EP1030960A1 EP 1030960 A1 EP1030960 A1 EP 1030960A1 EP 98959765 A EP98959765 A EP 98959765A EP 98959765 A EP98959765 A EP 98959765A EP 1030960 A1 EP1030960 A1 EP 1030960A1
Authority
EP
European Patent Office
Prior art keywords
steam
water
generator
power plant
injection rate
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.)
Granted
Application number
EP98959765A
Other languages
German (de)
English (en)
Other versions
EP1030960B1 (fr
Inventor
Günter Kallina
Rudolf Kral
Eberhard Wittchow
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
Publication of EP1030960A1 publication Critical patent/EP1030960A1/fr
Application granted granted Critical
Publication of EP1030960B1 publication Critical patent/EP1030960B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

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
    • F22—STEAM GENERATION
    • F22G—SUPERHEATING OF STEAM
    • F22G5/00—Controlling superheat temperature
    • F22G5/12—Controlling superheat temperature by attemperating the superheated steam, e.g. by injected water sprays

Definitions

  • the invention relates to a method for rapid power control of a steam power plant with a turbo set having a steam turbine and a generator. It also relates to a steam power plant suitable for carrying out the method.
  • a secure energy supply in an electrical power supply system requires a careful coordination between the generation of electrical energy by a number of power plant blocks and the consumption of this energy by a number of consumers in an electrical distribution network. If the generation and decrease of electrical energy are of the same size, the network frequency, which is an essential parameter in an electrical network, is constant. Their nominal value is e.g. in the European network 50Hz. A frequency deviation that e.g. by the failure of a power plant block and by switching a consumer on or off can be regarded as a measure of an increase or decrease in the generator output.
  • a control device used to regulate and / or control the fast seconds reserve.
  • rapid power control ie for activating the seconds reserve, this results in a throttling of the steam supply to preheaters, a throttling of the process steam and / or a throttling of the condensate.
  • Position setpoints for control valves in turbine taps and for actuators for setting the condensate are formed in such a way that a required additional generator output is achieved.
  • the disadvantage here is that the design of a steam turbine suitable for this purpose is comparatively complex.
  • the control mechanism mentioned is also complex and therefore prone to failure, so that such a system for fast power control is only partially reliable.
  • the invention is therefore based on the object of specifying a method for rapid power control of a steam power plant of the type mentioned above, in which a reliable fast power control is ensured with particularly little effort.
  • a steam power plant that is particularly suitable for carrying out the method is to be specified.
  • this object is achieved according to the invention in that, in the case of a steam power plant, during the operation of which an injection of water into an superheater heating surface takes place, the injection rate of the water is increased in order to set an additional generator output.
  • the invention is based on the consideration that the reliable activation of steam accumulators in the water-steam circuit of the steam turbine should be dispensed with in order to ensure reliable, rapid power control with particularly little effort with regard to the components used. Without activating steam accumulators, a comparatively rapid increase in the power output of the steam turbine can be achieved by supplying it to the steam turbine. steam mass flow is temporarily increased. Such an increase takes place through additional injection of water into or in front of the superheater heating surface.
  • the additional water injection in the area of the superheater heating area causes the generation of an additional steam flow which, after a short time, causes an increase in the power output by the steam turbine.
  • the steam temperature in the superheater heating surface is initially reduced.
  • the lowering of the steam temperature leads to an increase in the temperature difference between the superheater heating surface and the steam, which is decisive for the amount of heat transfer. In this way, storage heat can be extracted from the superheater heating surface and additional heat from the flue gas, so that the heat transferred to the superheater heating surface in the steam generator rises temporarily.
  • the injection rate of the water into a high-pressure superheater and / or an intermediate superheater is expediently increased in order to set the additional generator power.
  • the setpoint for the temperature of the steam flowing out of the superheater heating surface is advantageously at least after a waiting time of about one minute, calculated from the increase in the injection rate of the water Reduced amount.
  • the steam temperature in the superheater heating area drops after about 60 s due to the increased injection rate of the water, which could result in a reduction in the injection rate of the water and thus a decrease in the power output by the steam turbine in the case of temperature-controlled regulation. If the setpoint for the temperature of the this safely prevents steam flowing out of the heating surface.
  • the fuel inflow to a fossil-heated combustion chamber assigned to the steam generator of the steam power plant is increased as quickly as possible, that is to say simultaneously or immediately after the increase in the injection rate of the water, by a value adapted to the requested additional generator output.
  • the increase in the fuel inflow can take effect after a time of approximately 2 to 4 minutes in the form of the increase in the electrical power output by the steam turbine.
  • the injection rate of the water can be reduced to its original value and the steam temperature control intended for continuous operation can be reactivated.
  • the above-mentioned tasks are solved according to the invention by providing a superheater heating surface of the steam generator with a water injector , which is connected to a controller module for setting an injection rate of water into the superheater heating surface, the controller module providing an actuating signal for the water injector as a function of a requested additional generator output.
  • the controller module is thus designed in such a way that a generator demand that is requested at short notice is increased by increasing the rate of water injection into the superheater heating system. area is made.
  • the injection valves arranged on the water injector, on which the controller module acts, are expediently provided with fast-working drives for this purpose.
  • the controller module is also designed such that the opening and closing impulses for the drives of these injection valves are given by the power control of the steam power plant and not by the temperature control of the steam power plant.
  • the controller module is advantageously connected on the output side via a signal line to a control valve provided for setting the feed water inflow into the steam generator or to a control valve provided for setting the fuel inflow into a combustion chamber assigned to the steam generator.
  • a power reserve can be activated on the one hand for a short time by increasing the injection rate of the water and on the other hand in the medium or long term an increase in the continuous power output by varying the fuel inflow to the combustion chamber.
  • the advantages achieved by the invention consist in particular in that the setting of an additional generator power is made possible by increasing the injection rate of the water with particularly simple means and without additional requirements on the components used.
  • no complex measures are required to adapt the steam turbine to the requirements of the fast power control.
  • the concept for fast power control is therefore particularly suitable for steam turbines of normal design, which can be operated with particularly low heat consumption in the entire load range.
  • the steam turbine is only used to a small extent in the case of such a rapid power control, so that repeated repetition of such a rapid power control does not result in any damage to the steam turbine.
  • the steam power plant 1 comprises a steam turbine 2, which is connected to a generator 6 via a turbine shaft 4.
  • the steam turbine 2 comprises a high-pressure part 2a and a low-pressure part 2b.
  • the steam turbine 2 is thus designed in two stages.
  • the steam turbine 2 can also comprise only one or more, in particular three, pressure stages.
  • the steam turbine 2 is connected on the output side to a condenser 12 via a steam line 10.
  • the condenser 12 is connected to a feed water tank 20 via a line 14, into which a condensate pump 16 and a steam-heated preheater 18 are connected.
  • the feed water tank 20 is connected on the output side via a feed line 22, into which a feed water pump 24 and a steam-heated preheater 26 are connected, to a heating surface arrangement 30 arranged in a steam generator 28.
  • the heating surface arrangement 30 comprises an evaporator heating surface 32.
  • the evaporator heating surface 32 can be designed as a continuous evaporator heating surface or as a natural circulation evaporator heating surface.
  • the evaporator heating surface can be connected in a known manner to a water-steam drum (not shown in the exemplary embodiment) in order to form a circulation.
  • the evaporator heating surface 32 is connected to a high-pressure superheater 34, which is also arranged in the steam generator 28 and is connected on the outlet side to the steam inlet 36 of the high-pressure part 2 a of the steam turbine 2.
  • the steam outlet 38 of the high pressure part 2 a of the steam turbine 2 is connected via an intermediate superheater 40 to the steam inlet 42 of the low pressure part 2 b of the steam turbine 2.
  • Its steam outlet 44 is connected to the condenser 12 via the steam line 10, so that a closed water-steam circuit 46 is created.
  • the water-steam circuit 46 shown in the figure is thus made up of only two pressure stages. However, it can also be constructed from only one or from several, in particular three, pressure stages, further heating surfaces being arranged in a known manner in the steam generator 28.
  • Both the high-pressure part 2a and the low-pressure part 2b of the steam turbine 2 can be bypassed via a bypass line 52 or 54, which can be shut off with a valve 48 or 50.
  • the bypass line 54 associated with the low-pressure part 2b of the steam turbine 2 opens directly into the condenser 12 on the output side.
  • a fossil-fired combustion chamber 56 is assigned to the steam generator 28.
  • the combustion chamber 56 can be supplied with fuel via a fuel feed line 60 which can be shut off with a valve 58 and with combustion air via a line 62 which can be shut off with a valve 62.
  • a water injector 70 is assigned to the high-pressure superheater 34 and can be acted upon by water W via a feed line 72.
  • a water injector 74 is assigned to the reheater 40, which can also be supplied with water W via a feed line 76.
  • the water injector 70 and the water injector 74 are each connected to a controller module 82 via a signal line 78, 80.
  • the control module 82 acts on the water injector 70 and the water injector 74 in such a way that the temperature of the steam D flowing out of the high-pressure superheater 34 or from the intermediate superheater 40 is constant in a predeterminable tolerance band.
  • the controller module 82 is connected to suitably arranged temperature sensors in a manner not shown in detail.
  • the controller module 82 is designed in such a way that an additional generator power can be set for rapid power control by increasing the injection rate of the water W into the high-pressure superheater 34 and / or into the intermediate superheater 40.
  • the temperature-controlled regulation of the controller module 82 is deactivated in the case of a requested generator output and replaced by a performance-related controller principle.
  • the controller module 82 increases the injection rate of the water W into the high-pressure superheater 34 or into the intermediate superheater 40 by means of signals given to the water injector 70 and the water injector 74 such that an increase in the power output of the steam turbine 2 begins due to the increased steam mass flows.
  • the controller module 82 is also connected on the output side via a signal line 84 to a control valve 86 connected to the supply line 22.
  • the flow rate of feed water to the steam generator 28 can thus be set via the controller module 82.
  • controller module 82 is connected to the valve 62 via a signal line 90 and to the control valve 58 via a signal line 92.
  • the air supply and also the fuel supply to the combustion chamber 56 can thus be set via the controller module 82.
  • the controller module 82 is designed such that the fuel inflow to the combustion chamber 56 simultaneously with or immediately after the increase in the Spray rate of the water W is increased by a value adapted to the arranged additional generator power.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Control Of Turbines (AREA)
  • Control Of Steam Boilers And Waste-Gas Boilers (AREA)
  • Control Of Eletrric Generators (AREA)
  • Engine Equipment That Uses Special Cycles (AREA)

Abstract

Dans une centrale thermique à vapeur (1) comportant un turbogénérateur constitué d'une turbine à vapeur (2) et d'un générateur (6), dans lequel l'eau (W) est injectée dans ou devant une surface de surchauffeur, la régulation de la puissance doit se faire de la manière la plus simple et la plus rapide possible. Selon un procédé permettant de réguler rapidement une centrale thermique à vapeur (1), l'augmentation du débit d'injection de l'eau (W) permet de réguler l'augmentation de puissance du générateur. Dans une centrale thermique à vapeur (1) particulièrement adaptée à la mise en oeuvre dudit procédé, une surface de surchauffeur d'un générateur de vapeur (28) comporte un injecteur d'eau (70, 72) relié à un module de régulation (82) permettant de réguler le débit d'injection de l'eau (W) à la surface de surchauffeur. Le module de régulation (82) envoie un signal de régulation à l'injecteur (70, 72) en fonction de l'augmentation de puissance du générateur nécessaire.
EP98959765A 1997-11-10 1998-10-28 Procede permettant de reguler rapidement la puissance d'une centrale thermique a vapeur et centrale thermique a vapeur Expired - Lifetime EP1030960B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19749452A DE19749452C2 (de) 1997-11-10 1997-11-10 Dampfkraftanlage
DE19749452 1997-11-10
PCT/DE1998/003153 WO1999024698A1 (fr) 1997-11-10 1998-10-28 Procede permettant de reguler rapidement la puissance d'une centrale thermique a vapeur et centrale thermique a vapeur

Publications (2)

Publication Number Publication Date
EP1030960A1 true EP1030960A1 (fr) 2000-08-30
EP1030960B1 EP1030960B1 (fr) 2002-08-07

Family

ID=7848064

Family Applications (1)

Application Number Title Priority Date Filing Date
EP98959765A Expired - Lifetime EP1030960B1 (fr) 1997-11-10 1998-10-28 Procede permettant de reguler rapidement la puissance d'une centrale thermique a vapeur et centrale thermique a vapeur

Country Status (12)

Country Link
US (1) US6301895B1 (fr)
EP (1) EP1030960B1 (fr)
JP (1) JP4343427B2 (fr)
KR (1) KR100563518B1 (fr)
CN (1) CN1143947C (fr)
CA (1) CA2309058C (fr)
DE (2) DE19749452C2 (fr)
ES (1) ES2182377T3 (fr)
ID (1) ID24120A (fr)
MY (1) MY118855A (fr)
RU (1) RU2209320C2 (fr)
WO (1) WO1999024698A1 (fr)

Cited By (1)

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Publication number Priority date Publication date Assignee Title
WO2020038924A1 (fr) 2018-08-20 2020-02-27 Ostermann, Frank Centrale électrique et son procédé de fonctionnement

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EP1191192A1 (fr) * 2000-09-26 2002-03-27 Siemens Aktiengesellschaft Procédé et dispositif pour préchauffer et enlever l'eau de conduits de vapeur pour étages de turbines
US6812586B2 (en) * 2001-01-30 2004-11-02 Capstone Turbine Corporation Distributed power system
US6626637B2 (en) 2001-08-17 2003-09-30 Alstom (Switzerland) Ltd Cooling method for turbines
US7021063B2 (en) * 2003-03-10 2006-04-04 Clean Energy Systems, Inc. Reheat heat exchanger power generation systems
US6766646B1 (en) 2003-11-19 2004-07-27 General Electric Company Rapid power producing system and method for steam turbine
WO2005100754A2 (fr) 2004-04-16 2005-10-27 Clean Energy Systems, Inc. Systeme d'alimentation a cycle rankine ferme sans emissions
US7274111B2 (en) * 2005-12-09 2007-09-25 General Electric Company Methods and apparatus for electric power grid frequency stabilization
EP1806533A1 (fr) * 2006-01-05 2007-07-11 Siemens Aktiengesellschaft Cycle à vapeur d'une centrale électrique
US7870735B2 (en) * 2007-03-07 2011-01-18 Romanelli Energy Systems, L.L.C. Closed loop expandable gas circuit for power generation
US8104283B2 (en) * 2007-06-07 2012-01-31 Emerson Process Management Power & Water Solutions, Inc. Steam temperature control in a boiler system using reheater variables
US8733104B2 (en) * 2009-03-23 2014-05-27 General Electric Company Single loop attemperation control
EP2244011A1 (fr) * 2009-03-24 2010-10-27 Siemens AG Procédé et dispositif de réglage de la température de la vapeur pour une centrale à vapeur
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JP5430535B2 (ja) * 2010-10-25 2014-03-05 本田技研工業株式会社 プラントの制御装置
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EP2655811B1 (fr) 2011-02-25 2015-10-14 Siemens Aktiengesellschaft Procédé pour ajuster une augmentation de puissance de courte durée d'une turbine à vapeur
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Also Published As

Publication number Publication date
CA2309058C (fr) 2007-02-13
RU2209320C2 (ru) 2003-07-27
EP1030960B1 (fr) 2002-08-07
CA2309058A1 (fr) 1999-05-20
JP4343427B2 (ja) 2009-10-14
ES2182377T3 (es) 2003-03-01
KR20010040271A (ko) 2001-05-15
DE59805131D1 (de) 2002-09-12
US6301895B1 (en) 2001-10-16
CN1277653A (zh) 2000-12-20
ID24120A (id) 2000-07-06
WO1999024698A1 (fr) 1999-05-20
DE19749452C2 (de) 2001-03-15
MY118855A (en) 2005-01-31
DE19749452A1 (de) 1999-05-20
JP2001522964A (ja) 2001-11-20
KR100563518B1 (ko) 2006-03-27
CN1143947C (zh) 2004-03-31

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