[특허]Method for operating a once-through steam generator and forced-flow steam generator

Method for operating a once-through steam generator and forced-flow steam generator 원문보기

IPC분류정보
국가/구분	United States(US) Patent 등록
국제특허분류(IPC7판)	F22D-005/26 F22B-035/10 F22B-035/12 F22B-037/38
출원번호	US-0743881 (2008-11-14)
등록번호	US-9482427 (2016-11-01)
우선권정보	EP-07023081 (2007-11-28)
국제출원번호	PCT/EP2008/065522 (2008-11-14)
§371/§102 date	20100520 (20100520)
국제공개번호	WO2009/068446 (2009-06-04)
발명자 / 주소	Brückner, Jan Franke, Joachim Thomas, Frank
출원인 / 주소	SIEMENS AKTIENGESELLSCHAFT
인용정보	피인용 횟수 : 0 인용 특허 : 38

초록 ▼

A method for operating a once-through steam generator including an evaporator heating surface is provided. A target value for the supply water mass flow is fed to a device for setting the supply water mass flow, which is predefined using the ratio of the heat flow currently being transferred in the evaporator heating surface from the hot gas to the flow medium to a target enthalpy increase predefined with respect to the desired live steam condition of the flow medium in the evaporator heating surface. A forced-flow steam generator used for carrying out the method is also provided. The heat flow transferred from the hot gas to the flow medium is ascertained for this purpose allowing for a specific temperature value characteristic of the current temperature of the hot gas at the evaporator inlet and a specific mass flow value characteristic for the current mass flow of the hot gas.

대표청구항 ▼

1. A method for operating a once-through steam generator including an evaporator heating surface, comprising: supplying a device for setting the supply water mass flow with a target value for the supply water mass flow;calculating the target value using a ratio of a current heat flow transferred in the evaporator heating surface from a hot gas to a flow medium to a predetermined target enthalpy increase of the flow medium in the evaporator heating surface with respect to a desired live steam state wherein the predetermined target enthalpy increase takes into consideration an actual enthalpy at an evaporator heating surface inlet which is determined using a temperature and a pressure, respectively measured using a temperature sensor and a pressure sensor at the evaporator heating surface inlet;determining the heat flow transferred from the hot gas to the flow medium by taking into account a specific temperature characteristic for the current temperature of the hot gas at the evaporator heating surface inlet and a specific mass flow characteristic for a current mass flow of the hot gas, andwherein the ratio is created using a division element including as a numerator the current heat flow transferred in the evaporator heating surface from the hot gas to the flow medium and as a denominator the predetermined target enthalpy increase of the flow medium in the evaporator heating surface with respect to the desired live steam state. 2. The method as claimed in claim 1, wherein a first current measured value is used for the specific temperature characteristic, andwherein a second current measured value is used for the specific mass flow characteristic. 3. The method as claimed in claim 1, wherein the heat flow transferred from the hot gas to the flow medium is determined on the basis of an enthalpy difference of the hot gas between the heating surface evaporator inlet and an evaporator heating surface outlet. 4. The method as claimed in claim 3, wherein the enthalpy difference of the hot gas is modified for determining the heat flow transferred from the hot gas to the flow medium by a characteristic correction value for the heat input or output into a plurality of evaporator heating surface components. 5. The method as claimed in claim 3, wherein a current enthalpy of the hot gas at the evaporator heating surface outlet is determined on the basis of the pressure of the flow medium at the evaporator heating surface inlet and taking into account the specific mass flow characteristic. 6. The method as claimed in claim 1, wherein the target enthalpy increase of the flow medium in the evaporator heating surface is predetermined by taking into account a current pressure of the flow medium at the evaporator heating surface outlet. 7. The method as claimed in claim 6, wherein in the predetermining of the target enthalpy increase of the flow medium at the evaporator heating surface outlet, a current cooling requirement at a plurality of injection coolers connected downstream from the evaporator heating surface is taken into account. 8. The method as claimed in claim 1, wherein for the target value a fill level correction value is taken into account which characterizes a first deviation of an actual state of the fill level in a water reservoir connected downstream from the evaporator heating surface from an assigned target value. 9. The method as claimed in claim 1, wherein an enthalpy correction value is taken into account for the target value, which characterizes a second deviation of a current level of the enthalpy at the evaporator heating surface outlet from the assigned target value.

이 특허에 인용된 특허 (38)

Itschner Bruno (Karlsruhe DT), Apparatus and method for obtaining an electrical signal corresponding to the specific enthalpy of steam.
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Duffy Thomas E., Circuit assembly for once-through steam generators.
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Martz Lyle F. (Verona PA) Plotnick Richard J. (Cherry Hill NJ), Combined cycle electric power plant and a heat recovery steam generator having improved temperature control of the steam.
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Butterlin Axel (Eckersdorf DEX) Drr Hermann (Herzogenaurach DEX) Franke Joachim (Altdorf DEX), Forced once-through steam generator.
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Joachim Franke DE; Rudolf Kral DE; Eberhard Wittchow DE, Fossil fuel-fired continuous-flow steam generator.
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Kastner Wolfgang,DEX ; Kohler Wolfgang,DEX ; Wittchow Eberhard,DEX, Fossil fuel-fired once-through flow stream generator.
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Sugishita Hideaki,JPX ; Mori Hidetaka,JPX ; Tsukuda Yoshiaki,JPX ; Uematsu Kazuo,JPX ; Akita Eiji,JPX, Gas turbine combined cycle.
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Franke,Joachim; Kral,Rudolf; Wittchow,Eberhard, Horizontally assembled steam generator.
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Fitzgerald Francis D., Hybrid steam generating system and method.
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Hamy Norbert,CAX ITX M9A 3T5, Internal combustion engine with crankcase pressure barrier.
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Lagow Ralph J. (2511-B NASA Rd. 1 ; Ste. 102 Seabrook TX 77586), Method and apparatus for generating power from a vapor.
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Franke Joachim,DEX ; Wittchow Eberhard,DEX, Method and apparatus for starting up a continuous-flow steam generator.
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Lorentzen Gustav (Trondheim NOX) Pettersen Jostein (Trondheim NOX) Bang Roar R. (Trondheim NOX), Method and device for high side pressure regulation in transcritical vapor compression cycle.
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Franke Joachim,DEX ; Wittchow Eberhard,DEX, Method and device for monitoring a feedwater supply to a steam generator.
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Kral Rudolf,DEX ; Franke Joachim,DEX, Method and system for starting up a continuous flow steam generator.
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Ruchti Christoph,CHX, Method for feed water control in waste heat steam generators.
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Liebig Erhard,DEX, Method for starting up a once-through heat recovery steam generator and apparatus for carrying out the method.
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Ziegner Manfred,DEX, Method of expanding a flue-gas flow in a turbine, and corresponding turbine.
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Wittchow Eberhard (Erlangen DEX), Method of operating a once-through steam generator.
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Arakawa Tadao (Hitachi JPX), Method of water level control for a combined cycle power plant and control system therefor.
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Palchik David (Bloomfield CT), Once through sliding pressure steam generator.
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Dolezal Richard (Stuttgart DEX), Once-through steam generator.
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Budin Kurt (Vienna) Gasteiger Georg (Vienna ATX), Process for starting up a heat exchanger system for steam generation and heat exchanger system for steam generation.
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Gorzegno Walter P. (Morristown NJ), Variable pressure vapor generator utilizing crossover circuitry for the furnace boundary wall fluid flow tubes.
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