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EP2423465A2 - Procédé de fonctionnement d'une centrale à turbine à vapeur et dispositif de production de vapeur - Google Patents

Procédé de fonctionnement d'une centrale à turbine à vapeur et dispositif de production de vapeur Download PDF

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Publication number
EP2423465A2
EP2423465A2 EP10005879A EP10005879A EP2423465A2 EP 2423465 A2 EP2423465 A2 EP 2423465A2 EP 10005879 A EP10005879 A EP 10005879A EP 10005879 A EP10005879 A EP 10005879A EP 2423465 A2 EP2423465 A2 EP 2423465A2
Authority
EP
European Patent Office
Prior art keywords
vapor
air preheater
flue gas
steam
combustion air
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Withdrawn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
EP10005879A
Other languages
German (de)
English (en)
Other versions
EP2423465A3 (fr
Inventor
Georg Berger
Martin Belting
Christian Fielenbach
Toni Rupprecht
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.)
RWE Power AG
Original Assignee
RWE Power 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 RWE Power AG filed Critical RWE Power AG
Publication of EP2423465A2 publication Critical patent/EP2423465A2/fr
Publication of EP2423465A3 publication Critical patent/EP2423465A3/fr
Withdrawn legal-status Critical Current

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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
    • F01K17/00—Using steam or condensate extracted or exhausted from steam engine plant
    • F01K17/06—Returning energy of steam, in exchanged form, to process, e.g. use of exhaust steam for drying solid fuel or plant

Definitions

  • the invention relates to a method for operating a steam turbine power plant with a lignite-fired steam generator, in which the brown coal is first subjected to indirect drying in a fluidized bed dryer, wherein the fluidized bed dryer is at least partially heated with steam from the water-steam cycle of the steam generator.
  • a method of the type mentioned is, for example, from DE 103 19 477 A1 known.
  • the invention further relates to a device for producing steam, comprising at least one dryer for predrying lignite wet brown coal, at least one lignite fired steam boiler, at least one steam generator downstream steam turbine, at least one feedwater supply to the steam generator, a device for feedwater preheating and at least one air preheater for the combustion air.
  • the burning of lignite is so special in that the lignite wet lignite contains up to 65% water, which in comparison to the generation of electricity from coal higher specific CO 2 emissions arise in the production of electricity from lignite.
  • a significant increase in the efficiency can be achieved, whereby the specific CO 2 emission is reduced.
  • the lignite brown coal has a water content of 45 to 65%, which is reduced by drying to about 10 to 25%.
  • WTA process fluidized-bed drying with internal waste heat utilization
  • the efficiency of a lignite power plant can be about 4 up to 5 percentage points over conventional lignite-fired power plant technology.
  • pre-ground raw lignite is introduced into the stationary fluidized bed of a dryer which operates at a slight overpressure.
  • heating coils are arranged, the heating steam condenses at a temperature level of about 130 ° C.
  • the leaked from the raw lignite coal during drying in the fluidized bed drying plant water is slightly superheated and vapor before as a separate stream, which is referred to as vapors.
  • Part of the vapor is returned to the dryer via a blower to fluidize the fluidized bed.
  • the invention is therefore based on the object with respect to a method and a device of the type mentioned with respect. To improve the energetic use of the resulting in the drying of the vapor.
  • the object is initially achieved by a method for operating a steam turbine power plant with a lignite-fired steam generator, in which the brown coal is first subjected to indirect drying in a fluidized bed dryer, wherein the fluidized bed dryer at least partially heated with steam from the water-steam cycle of the steam generator is, wherein the method according to the invention is characterized in that the energy of the resulting from the drying of lignite vapor is at least partially used for preheating the combustion air.
  • the procedure of the invention has the advantage that the amount of heat that has been coupled into the combustion air, no longer needs to be decoupled from the flue gas via the windward. It is thus shifted a certain amount of heat from a low to a higher temperature level, which is then made available to the water-steam cycle.
  • Luvo in the context of the invention is not necessarily to be understood as a regenerative heat exchanger, but this may for example also be a flue gas heated Luvo.
  • the windward additional heat from the already partially cooled by means of the windward flow of flue gas is abandoned.
  • the heat from the flue gas behind the air preheater can be coupled out by means of a heat transfer medium, for example by means of water.
  • At least one partial stream of the vapor after being drawn off from the fluidized-bed dryer is compressed in a vapor compressor and fed to at least one condensation heat exchanger. So, in addition, the free Expected condensation heat of the vapor used.
  • the compression increases the temperature level at which the vapors condense, thus a higher air preheating can be achieved. In this case, such amounts of energy can be coupled into the combustion air, that under certain circumstances a decoupling of heat from the flue gas for the purpose of combustion air preheating is completely unnecessary.
  • a partial flow of the flue gas is branched off in front of the air preheater and used to preheat the boiler feed water, with the bridging of the air preheater.
  • the object underlying the invention is further achieved by a device for generating steam, comprising at least one dryer for predrying lignite wet lignite, at least one fired with the pre-dried lignite steam boiler, at least one steam generator downstream steam turbine, at least one feedwater supply to the steam generator, at least a device for feedwater preheating and at least one air preheater for the combustion air, wherein the device according to the invention is characterized in that the air preheater in the fresh air supply at least one heat exchanger is connected upstream, which is connected to the vapor outlet of the dryer.
  • the dryer is designed as a fluidized bed dryer.
  • the dryer does not necessarily have to be formed as a fluidized bed dryer, but drying can also take place in other indirectly heated reactors in which high-energy vapors / swaths obtained.
  • the guided to the air preheater flue gas line is provided with a branch bypassing the air preheater, which is connected to the feedwater preheating.
  • At least one further flue gas cooler may be provided, which cooperates with the combustion air supply in front of the air preheater.
  • At least one vapor compressor is provided, which is connected upstream of at least one condensation heat exchanger in the combustion air supply in front of the air preheater.
  • the air preheater is expediently designed as a regenerative air preheater.
  • the reference numeral 4 designates the steam generator of the steam turbine power plant.
  • the steam generator 4 is designed as a lignite-fired boiler. In this water is evaporated in a known manner and expanded in a downstream steam turbine 5.
  • the steam turbine 5 comprises a high-pressure part, a medium-pressure part and a low-pressure part, which are not designated more precisely in the process diagram.
  • the steam turbine 5 drives a generator 6, which in turn feeds electrical energy into a power grid.
  • the steam turbine 5 is followed by a condenser 7, in which the low-pressure steam is condensed.
  • the condensate is returned to the steam generator 4.
  • the steam generator 4 is charged with dry lignite as fuel, which was subjected to indirect drying in a fluidized bed dryer 8.
  • the fluidized-bed dryer 8 is heated with steam from the low-pressure part of the steam turbine 5.
  • Part of the resulting in the drying of brown coal vapor 1 is first dedusted in a dust collector 9 and fed back to the fluidized bed dryer 8 with a fan 10 as a fluidizing agent. Further partial streams of the vapor 1 are, as will be described below, used to preheat the combustion air 2.
  • the combustion air 2 is supplied in a known manner to a regenerative air preheater 11, in which the combustion air is preheated in countercurrent with the flue gas 3.
  • a partial flow of the flue gas 3 is passed over a bypass line 12 to the air preheater 11.
  • This first passes through a first high-pressure air bypass economizer 13 (HD-Lubeco) and then via a low-pressure air bypass economizer 14 (ND Lubeco), which are connected in series with respect to the flue gas stream 3.
  • the heat content of the flue gas 3 is coupled via the HD Lubeco 13 in the high pressure part of the feedwater circuit, the remaining heat of the flue gas is coupled in the next stage in the low pressure part of the boiler feedwater cycle.
  • a further flue gas cooler 15 is provided, which emits its heat load via a water / air preheater 16 provided in the combustion air supply.
  • the flue gas cooler 15 and the water / air preheater 16 communicate with each other via water as the heat transfer medium in a closed circuit.
  • the combustion air 2 passes in the process variant 1 according to FIG. 1 at a temperature of about 10 ° C in a Brüdenluftvor Anlagenr 17, where it is heated to about 95 ° C.
  • the Brüden Kunststoffvor Anlagenr 17 is acted upon by a partial flow of the vapor 1 from the fluidized bed dryer 8.
  • the vapor / air preheater 17 is downstream of the water / air preheater 16, viewed in the flow direction of the combustion air 2, in which the combustion air 2 can be raised to a temperature of about 140 ° C.
  • the combustion air 2 then flows through the regenerative air preheater 11, where it is heated in countercurrent with the about 360 ° C hot flue gas to about 330 ° C.
  • a first partial stream of the vapor 1 is fed to the vapor air preheater 17, this is upstream of the condensation heat exchanger 19 in the flow direction of the combustion air 2.
  • the energy of the vapor 1 is coupled in several stages in the combustion air 2, wherein in the condensation heat exchanger 19 in addition a further part of the released heat of condensation of the vapor 1 is used.
  • the air compared to the method accordingly FIG. 1 be preheated to a higher temperature.
  • the downstream in the flue gas flow flue gas cooler 20 may also couple the decoupled from the flue gas heat quantity in the boiler feed water.
  • this downstream can be a cooling tower 22, which serves primarily to cool the condensate from the condenser 7.
  • a flue gas inlet from the flue gas desulfurization 21 take place.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Drying Of Solid Materials (AREA)
  • Fluidized-Bed Combustion And Resonant Combustion (AREA)
EP10005879.1A 2009-07-28 2010-06-08 Procédé de fonctionnement d'une centrale à turbine à vapeur et dispositif de production de vapeur Withdrawn EP2423465A3 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102009035062A DE102009035062A1 (de) 2009-07-28 2009-07-28 Verfahren zum Betrieb eines Dampfturbinenkraftwerks sowie Einrichtung zur Erzeugung von Dampf

Publications (2)

Publication Number Publication Date
EP2423465A2 true EP2423465A2 (fr) 2012-02-29
EP2423465A3 EP2423465A3 (fr) 2013-12-04

Family

ID=43430025

Family Applications (1)

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EP10005879.1A Withdrawn EP2423465A3 (fr) 2009-07-28 2010-06-08 Procédé de fonctionnement d'une centrale à turbine à vapeur et dispositif de production de vapeur

Country Status (3)

Country Link
EP (1) EP2423465A3 (fr)
AU (1) AU2010202597B2 (fr)
DE (1) DE102009035062A1 (fr)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103206848A (zh) * 2013-03-29 2013-07-17 华润电力控股有限公司 一种降低褐煤电厂煤耗和水耗的系统集成方法
WO2015028387A3 (fr) * 2013-08-30 2015-04-30 Siemens Aktiengesellschaft Procédé de récupération d'eaux usées de processus provenant d'une centrale thermique à vapeur à combustible fossile et centrale thermique à vapeur à combustible fossile
EP2894303A1 (fr) * 2014-01-10 2015-07-15 Siemens Aktiengesellschaft Procédé de stockage intermédiaire d'énergie électrique excédentaire
US9835056B2 (en) 2015-05-26 2017-12-05 General Electric Technology Gmbh Lignite drying integration with a water/steam power cycle
US9944874B2 (en) 2015-05-26 2018-04-17 General Electric Technology Gmbh Lignite drying with a heat recovery circuit
US9944875B2 (en) 2015-05-26 2018-04-17 General Electric Technology Gmbh Lignite drying in a lignite fired power plant with a heat pump
US10392575B2 (en) 2015-05-26 2019-08-27 General Electric Company Lignite drying with closed loop heat pump

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102010010539A1 (de) * 2010-03-05 2011-09-08 Rwe Power Ag Verfahren zum Betreiben eines Dampfturbinenkraftwerks
DE102012019928A1 (de) * 2012-10-11 2014-04-30 Rwe Power Aktiengesellschaft Verfahren zum Betrieb eines Dampferzeugers
DE102014013813A1 (de) * 2014-09-23 2016-03-24 Bma Braunschweigische Maschinenbauanstalt Ag Verfahren und Anordnung zur Abwasserbehandlung

Citations (2)

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Publication number Priority date Publication date Assignee Title
DE19518644C2 (de) 1995-05-20 1998-04-16 Rheinische Braunkohlenw Ag Verfahren und Einrichtung zum Erzeugen von Dampf durch Verbrennen eines festen getrockneten Brennstoffes
DE10319477A1 (de) 2003-04-29 2004-11-25 Rwe Rheinbraun Ag Verfahren zum Betreiben eines Dampfturbinenkraftwerks sowie Einrichtung zum Erzeugen von Dampf

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DE3731720A1 (de) * 1987-09-21 1989-04-06 Saarberg Interplan Gmbh Verfahren zum trocknen von feststoffen
DE3835427A1 (de) * 1988-10-18 1990-04-19 Saarberg Interplan Gmbh Verfahren zur erzeugung elektrischer energie und/oder heiz- und prozesswaerme
DD281237B5 (de) * 1989-04-05 1994-08-25 Ver Energiewerke Ag Anordnung zur Trocknung wasserhaltiger fester Brennstoffe, insbesondere Rohbraunkohle
JPH0560304A (ja) * 1991-08-28 1993-03-09 Mitsubishi Heavy Ind Ltd 石油コークス焚ボイラ装置
DE4203713C2 (de) * 1992-02-08 1996-01-18 Rwe Energie Ag Verfahren zum Betrieb eines mit einem trocknungsbedürftigen Brennstoff befeuerten Kraftwerkes
DE19612186A1 (de) * 1996-03-27 1997-10-02 Steinmueller Gmbh L & C Verfahren zum Trocknen von Rohbraunkohle und Anlage zum Trocknen von Rohbraunkohle
JPH11351549A (ja) * 1998-06-08 1999-12-24 Ishikawajima Harima Heavy Ind Co Ltd 高湿分炭用燃焼設備
DE102006060472B4 (de) * 2006-12-19 2015-07-16 Alstom Technology Ltd. Verfahren zum Betreiben einer Dampfkraftanlage mit einem kohlegefeuerten Dampferzeuger sowie eine Dampfkraftanlage

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19518644C2 (de) 1995-05-20 1998-04-16 Rheinische Braunkohlenw Ag Verfahren und Einrichtung zum Erzeugen von Dampf durch Verbrennen eines festen getrockneten Brennstoffes
DE10319477A1 (de) 2003-04-29 2004-11-25 Rwe Rheinbraun Ag Verfahren zum Betreiben eines Dampfturbinenkraftwerks sowie Einrichtung zum Erzeugen von Dampf

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103206848A (zh) * 2013-03-29 2013-07-17 华润电力控股有限公司 一种降低褐煤电厂煤耗和水耗的系统集成方法
WO2015028387A3 (fr) * 2013-08-30 2015-04-30 Siemens Aktiengesellschaft Procédé de récupération d'eaux usées de processus provenant d'une centrale thermique à vapeur à combustible fossile et centrale thermique à vapeur à combustible fossile
JP2016536518A (ja) * 2013-08-30 2016-11-24 シーメンス アクティエンゲゼルシャフト 化石燃料蒸気発電所の処理廃水を回収するための方法および化石燃料蒸気発電所
EP2894303A1 (fr) * 2014-01-10 2015-07-15 Siemens Aktiengesellschaft Procédé de stockage intermédiaire d'énergie électrique excédentaire
US9835056B2 (en) 2015-05-26 2017-12-05 General Electric Technology Gmbh Lignite drying integration with a water/steam power cycle
US9944874B2 (en) 2015-05-26 2018-04-17 General Electric Technology Gmbh Lignite drying with a heat recovery circuit
US9944875B2 (en) 2015-05-26 2018-04-17 General Electric Technology Gmbh Lignite drying in a lignite fired power plant with a heat pump
US10392575B2 (en) 2015-05-26 2019-08-27 General Electric Company Lignite drying with closed loop heat pump

Also Published As

Publication number Publication date
DE102009035062A1 (de) 2011-02-10
EP2423465A3 (fr) 2013-12-04
AU2010202597B2 (en) 2014-09-11
AU2010202597A1 (en) 2011-02-17

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