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EP3511534A1 - Centrale thermique et procédé de fonctionnement d'une centrale thermique - Google Patents

Centrale thermique et procédé de fonctionnement d'une centrale thermique Download PDF

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Publication number
EP3511534A1
EP3511534A1 EP18208619.9A EP18208619A EP3511534A1 EP 3511534 A1 EP3511534 A1 EP 3511534A1 EP 18208619 A EP18208619 A EP 18208619A EP 3511534 A1 EP3511534 A1 EP 3511534A1
Authority
EP
European Patent Office
Prior art keywords
steam
power plant
electrical
heat
water
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Withdrawn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
EP18208619.9A
Other languages
German (de)
English (en)
Inventor
Volker Dreißigacker
Michael Krüger
Stefan Zunft
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.)
Deutsches Zentrum fuer Luft und Raumfahrt eV
Original Assignee
Deutsches Zentrum fuer Luft und Raumfahrt eV
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 Deutsches Zentrum fuer Luft und Raumfahrt eV filed Critical Deutsches Zentrum fuer Luft und Raumfahrt eV
Publication of EP3511534A1 publication Critical patent/EP3511534A1/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Withdrawn legal-status Critical Current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
    • F01K3/00—Plants characterised by the use of steam or heat accumulators, or intermediate steam heaters, therein
    • F01K3/18—Plants characterised by the use of steam or heat accumulators, or intermediate steam heaters, therein having heaters
    • F01K3/186—Plants characterised by the use of steam or heat accumulators, or intermediate steam heaters, therein having heaters using electric heat
    • 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
    • F01K1/00—Steam accumulators
    • F01K1/04—Steam accumulators for storing steam in a liquid, e.g. Ruth's 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
    • 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
    • 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
    • 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 steam power plant, such as brown coal or hard coal power plant, with a water-steam cycle, a generator connected to a generator for electrical energy turbine assembly and a thermal energy storage part containing a heat storage medium heat storage unit, a heat input device and a to the Has water-steam circuit or a flue gas path connected discharge device, and to a method for operating such a steam power plant.
  • a steam power plant and a method of this kind are in the DE 10 2011 100 517 A1 specified.
  • a control system for adapting the power of a steam turbine to a changed load in the context of a primary control is provided with a heat storage.
  • the heat storage takes with reduced load and thus increased amount of steam tapped from the steam turbine heat from the tapped steam and are at increased load and thus correspondingly reduced amount of the steam turbine tapped steam heat to a steam / feed water circuit, which supplies the steam turbine.
  • control system is based on the variation of the tapped steam quantity in connection with the intermediate storage of heat.
  • the change in the power plant steam turbine power over the amount of steam drawn off gives a limited margin for power adjustment.
  • structural design of the control system requires no small effort.
  • an energy storage power plant for electric power generation which is suitable for the transfer of electrical energy into thermal energy, wherein the thermal energy can be stored in a buffer until the time of need in at least two thermal storage and, if necessary, to increase the energy content of water in a water cycle can be retrieved.
  • a thermal storage for storing sensible heat and a thermal storage for storing latent heat is provided.
  • This energy storage power plant and the method used thereby takes advantage of the fact that electrical energy, which can be acquired relatively inexpensively in times of surplus production of electrical energy, can be converted into thermal energy, which is suitably stored in the energy storage power plant, and if required again the power generation can be supplied.
  • thermal storage electrical energy To charge the two thermal storage electrical energy must be removed from an electrical supply circuit, so as the public power grid, if necessary, which is then converted by means of one or more suitable conversion devices into thermal energy.
  • the DE 10 2012 003 267 A1 shows various heat storage with electric heaters, which can also be used in connection with a steam power plant.
  • the heat accumulator for a short time high surplus electricity quantities can be stored in order to be able to deliver them again at a later time over a longer period of time. Even such arrangements are inadequate to meet high flexibility requirements when adapting to requested services.
  • a steam power plant and a method of the DE 10 2011 078 193 A1 known.
  • a higher energy steam is tapped on a turbine assembly and admixed with a low energy steam tapped on the turbine assembly.
  • the vapor mixture is fed to a preheater, in particular a high pressure preheater of the steam power plant for heating a feedwater flowing through the preheater.
  • the controlled or controlled admixing of the higher-energy steam to the low-energy steam is intended to bring about a rapid power change in the steam power plant.
  • the present invention has the object, a steam power plant, especially brown coal or hard coal power plant, and a method for its operation in such a way that the most efficient increase in flexibility is achieved.
  • the heat coupling device has an electrical heating device, which can be acted upon by an electrical energy supply device with the electrical energy generated by the generator and at the output side removed therefrom by means of a process control.
  • the object is achieved by a method having the features of claim 5, wherein it is provided that the heat energy supplied to the thermal energy storage part is generated by means of an electrical heating device, wherein the warm-up device supplied electrical power of the electric power generated by the steam power plant on the output side is removed from the generator.
  • the thermal storage system with the energy storage more electric power supplied via the warm-up device while load increase, so increased power supply to the power grid, the thermal storage system with the energy storage correspondingly less electrical power is supplied, wherein the control or regulation of the power distribution, in particular also the operation of the warm-up, takes place via the process control.
  • the coal-fired power plant can provide very fast electrical power because it has not been shut down but is still running and thus a start of the sluggish system (warm / cold start) is bypassed.
  • the electrical heat stored during loading allows - depending on the place of integration - an electrical power increase during unloading, savings of coal and / or a power plant internal thermal management (auxiliary steam or the like.).
  • the thermal storage system by the extension of the thermal storage system by the electrical heating device, d. H. a high-performance electric heater, a high increase in flexibility in load subsidence, especially minimum load reduction, and increases load and dynamics achieved, resulting in high efficiency and as a further advantage at most low integration effects of thermal energy storage in the power plant process and thus have significant benefits for retrofitting existing Coal power plants result.
  • the integration of the electrically heated heat accumulator thus allows a mode of operation of the coal power plant under constant operating conditions, which also results in benefits in life and efficiency.
  • the necessary flexibility is provided by utilizing the electrically heated heat storage and by not shutting down the coal power plant.
  • the design that the electrical heating device is designed as a resistance heating device or as an inductive heating device, can achieve high-performance and efficient operations with high efficiencies.
  • thermal energy storage portion with a Ruths storage, a solid storage, or a molten salt storage.
  • the integration sites mentioned allow a low-feedback integration of the thermal storage system in the complex power plant process and thus give no or negligible effects on the operational limits of central power plant components, such as steam, turbines and the like.
  • the integration sites provide solutions that result in only relatively small shifts in operating conditions (eg, pressure, temperature) in the power plant process, thus ensuring extended operational availability while allowing for high flexibility gains.
  • the measures also contribute to an advantageous mode of operation in that the loading processes and the unloading processes are controlled or regulated by a process controller as a function of predetermined and / or predefinable process parameters, wherein superordinate control or controlled variables can be incorporated.
  • Fig. 1 shows a schematic representation of a water-steam cycle 1 of a steam power plant, such as in particular a brown coal or coal power plant, with arranged therein essential process components.
  • a thermal energy storage system with a thermal energy storage part 5 is connected to the water-steam cycle 1.
  • the water-steam cycle 1 comprises, as usual, a feedwater part 2, a steam generator section 3 following in the process flow, and a steam turbine arrangement 4 for driving a generator 7 for electrical power generation.
  • the feedwater part 2 is provided on the input side with a capacitor 21 connected to the output side of the turbine arrangement 4 and further comprises a condensate pump 22 and low-pressure preheater 23, a feedwater tank 20 and a feedwater pump 24 for providing the feedwater for the steam generator section 3.
  • high pressure preheater 30, a preheater 31, an evaporator 32, and a superheater 33 are arranged downstream of the process scheme to generate high pressure steam for the turbine assembly 4.
  • the turbine arrangement 4 comprises on the input side a high-pressure turbine 40, a subsequent medium-pressure turbine 41 and an output-side low-pressure turbine 42. Between the high-pressure turbine 40 and the medium-pressure turbine 41, a reheater 43 for the process steam is arranged.
  • the turbine assembly 4 which may be structurally designed differently and provided with different tapping points, as known per se, is driven in rotation by the steam mass flow passing through it in order to generate via the generator 7 the electric current or electric power to be provided by the steam power plant and thus to supply consumers connected via a power network.
  • the steam power plant must be able to react flexibly to different power requirements, the relatively slow process of steam generation, which is relatively slow in itself, precluding high flexibility requirements.
  • a heat storage unit 50 in the embodiment according to the invention, which is equipped with an electrical heating devicetician micheinkoppelungs worn. 6 having.
  • the heat storage unit 50 on the output side via a discharge device 51 with the water-steam circuit 1 present in the region of the steam generator section 3, namely connected to the Hochdruckvorierrn 30, via a heat exchanger.
  • the heat storage unit 50 has a high heat storage capacity and is advantageous for. B. with a solid reservoir (regenerator), liquid salt storage or a Ruths memory provided.
  • thermal energy storage part 5 consist in a discharge of heat energy in the feedwater part 2, in particular the Niederbuchvorierrn 23, in other places of the steam generator section 3, or in the (in the Fig. 1 not shown) flue gas path as well as in combinations of these integration sites.
  • the necessary thermal specifications can be met by a suitable design and control of the thermal energy storage part 5.
  • An essential feature of the invention of the steam power plant consists in a special embodiment of the heat coupling device 6 of the thermal energy storage part 5.
  • the heat coupling device 6 has in accordance Fig. 1 a powered by an electrical power supply 61 with electrical energy warm-up device 60, by means of which the heat storage unit 50 heat energy is supplied.
  • a conductive electrical method based on resistance heating or an inductive electric method is used for this purpose.
  • the electrical heat energy supply 61 is thereby fed by the electric power generated by the steam power plant to load the heat storage unit 50 with heat energy.
  • the electrical power supplied to the electrical heating device 60 can be controlled or regulated by means of a process control.
  • the control or regulation of the output side The electrical power removed from the generator 7 can, for example, be effected as a function of process parameters predetermined or predefinable in the power plant and / or as a function of control or regulating variables of a superordinate network control.
  • a load reduction of the steam power plant at a supply of electric power to the electric warm-up device 60 and a supply of heat energy with the thermal energy storage part 5, d. H. during a loading phase, achieved by the electrical energy generated in the steam power plant is used for electrically heating the heat storage unit 50 and the thermal energy storage.
  • a significant advantage of this method is that the steam generation in the steam generator section 3 can continue to operate and a high minimum load reduction of the fed from the steam power plant in the connected power supply power (up to a power of 0 W) is possible.
  • a very high flexibility of the steam power plant is achieved and prevents a shutdown of the sluggish steam generator device and thus a costly startup of the steam generation process, as in a warm or cold start.
  • the conserved in the heat storage unit 50 thermal energy is used to heat over the respective heat exchanger, a high-pressure preheating Effecting feedwater.
  • the coupling of the heat for high-pressure preheating thus allows during the discharge phase, a reduction of a tap quantity of steam at the steam turbine of the turbine assembly 4 and thus a higher electrical power through a higher steam mass flow.
  • the integration concept according to the invention thus makes it possible in steam power plants, in particular coal power plants, to provide a highly flexible reduction of the electrical load on the output side or electrical power output, which allows a minimum load reduction of the steam power plant up to 0 W, depending on the design or control of the electrical heating device 60.
  • the electric auxiliary heater dispenses with an elaborate procedural integration of the storage system into the water-steam cycle 1 and a shutdown of the steam generator, which on the one hand results in no negative integration effects and on the other hand can avoid warm and cold starts.
  • An additional electric power (generated by the warming by means of the thermal energy storage part 5) is achieved here by higher mass flows to the steam turbines, as can be dispensed with a removal of bleed steam for preheating the feed water in Hochdruckvorwarmer.
  • the inventive design also allows high efficiencies.
  • the heat generated electrically during the charging can be achieved, for example, with the aforementioned conductive method by resistance heating with very high efficiency (> 95%).
  • the additional electric power generated during the discharge is achieved by increased steam mass flows in the steam turbines, which operate at high isentropic efficiencies (approximately 90%) and thus achieve efficient power generation, possibly taking into account only efficiency-reducing effects due to a higher volume flow in the steam turbines are.

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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)
  • Control Of Turbines (AREA)
EP18208619.9A 2018-01-15 2018-11-27 Centrale thermique et procédé de fonctionnement d'une centrale thermique Withdrawn EP3511534A1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102018100712.4A DE102018100712A1 (de) 2018-01-15 2018-01-15 Dampfkraftwerk und Verfahren zum Betreiben eines Dampfkraftwerks

Publications (1)

Publication Number Publication Date
EP3511534A1 true EP3511534A1 (fr) 2019-07-17

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EP18208619.9A Withdrawn EP3511534A1 (fr) 2018-01-15 2018-11-27 Centrale thermique et procédé de fonctionnement d'une centrale thermique

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EP (1) EP3511534A1 (fr)
DE (1) DE102018100712A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114017148A (zh) * 2021-11-23 2022-02-08 河北鲲能电力工程咨询有限公司 一种大型煤电蒸汽储热发电调峰方法

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102022000765A1 (de) 2022-03-04 2023-09-07 Alexander Lapin Das Energiewärmespeicherkraftwerk

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20080134681A1 (en) * 2005-01-10 2008-06-12 New World Generation Inc. Power Plant Having A Heat Storage Medium And A Method Of Operation Thereof
WO2015117821A1 (fr) * 2014-02-07 2015-08-13 Siemens Aktiengesellschaft Accumulateur pour l'accumulation intermédiaire d'énergie électrique
US20150267566A1 (en) * 2014-03-18 2015-09-24 Vassilios Vamvas Combined Cycle Plant With Thermal Energy Storage
EP2927436A1 (fr) * 2014-04-04 2015-10-07 Mitsubishi Hitachi Power Systems Europe GmbH Procédé de fonctionnement d'une centrale avec assistance électrique et centrale correspondante

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CH196041A (de) * 1936-04-11 1938-02-28 Ruths International Accumulato Dampfkraftanlage mit Wärmespeicher.
DE102008009129A1 (de) 2008-02-14 2009-08-20 Hitachi Power Europe Gmbh Kohlekraftwerk und Verfahren zum Betrieb des Kohlekraftwerkes
DE102011100517A1 (de) * 2011-05-05 2012-11-08 Steag New Energies Gmbh. "Regelsystem zur Anpassung der Leistung einer Dampfturbine an eine veränderte Last "
DE102011078205A1 (de) 2011-06-28 2013-01-03 Siemens Aktiengesellschaft Hilfsdampferzeuger als zusätzliche Frequenz- bzw. Primär- und/oder Sekundärregelmaßnahme bei einem Dampfkraftwerk
DE102011078193A1 (de) 2011-06-28 2013-01-03 Siemens Aktiengesellschaft Zusätzliche Regelanzapfung für einen Vorwärmer zur Verbesserung der Anlagendynamik und Frequenzregelung bei einem Dampfkraftwerk
DE102012003267A1 (de) * 2012-02-16 2013-08-22 Fritz Richarts Vorrichtung und Verfahren zur Speicherung von elektrischer Überschussenergie
DE102012204081A1 (de) * 2012-03-15 2013-09-19 Siemens Aktiengesellschaft Energiespeicherkraftwerk
DE102012215569A1 (de) 2012-09-03 2014-03-06 Siemens Aktiengesellschaft Verfahren zur schnellen Wirkleistungsänderung von fossil befeuerten Dampfkraftwerksanlagen
DE102015109898A1 (de) 2015-02-20 2016-08-25 Mitsubishi Hitachi Power Systems Europe Gmbh Dampfkraftwerk und Verfahren zu dessen Betrieb

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20080134681A1 (en) * 2005-01-10 2008-06-12 New World Generation Inc. Power Plant Having A Heat Storage Medium And A Method Of Operation Thereof
WO2015117821A1 (fr) * 2014-02-07 2015-08-13 Siemens Aktiengesellschaft Accumulateur pour l'accumulation intermédiaire d'énergie électrique
US20150267566A1 (en) * 2014-03-18 2015-09-24 Vassilios Vamvas Combined Cycle Plant With Thermal Energy Storage
EP2927436A1 (fr) * 2014-04-04 2015-10-07 Mitsubishi Hitachi Power Systems Europe GmbH Procédé de fonctionnement d'une centrale avec assistance électrique et centrale correspondante

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114017148A (zh) * 2021-11-23 2022-02-08 河北鲲能电力工程咨询有限公司 一种大型煤电蒸汽储热发电调峰方法
CN114017148B (zh) * 2021-11-23 2024-05-28 河北鲲能电力工程咨询有限公司 一种大型煤电蒸汽储热发电调峰方法

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