US20130247571A1 - Retrofitting a heating steam extraction facility in a fossil-fired power plant - Google Patents

Retrofitting a heating steam extraction facility in a fossil-fired power plant Download PDF

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Publication number
US20130247571A1
US20130247571A1 US13/991,709 US201113991709A US2013247571A1 US 20130247571 A1 US20130247571 A1 US 20130247571A1 US 201113991709 A US201113991709 A US 201113991709A US 2013247571 A1 US2013247571 A1 US 2013247571A1
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United States
Prior art keywords
steam
steam turbine
heating
turbine
extraction
Prior art date
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Abandoned
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US13/991,709
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English (en)
Inventor
Andreas Pickard
Thomas Schneider
Gerald Stief
Johannes-Werner Wein
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Siemens AG
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Siemens AG
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Assigned to SIEMENS AKTIENGESELLSCHAFT reassignment SIEMENS AKTIENGESELLSCHAFT ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: PICKARD, ANDREAS, SCHNEIDER, THOMAS, STIEF, GERALD, WEIN, JOHANNES-WERNER
Publication of US20130247571A1 publication Critical patent/US20130247571A1/en
Abandoned 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
    • 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
    • F01K17/02—Using steam or condensate extracted or exhausted from steam engine plant for heating purposes, e.g. industrial, domestic
    • 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
    • F01K23/00—Plants characterised by more than one engine delivering power external to the plant, the engines being driven by different fluids
    • F01K23/02—Plants characterised by more than one engine delivering power external to the plant, the engines being driven by different fluids the engine cycles being thermally coupled
    • F01K23/06—Plants characterised by more than one engine delivering power external to the plant, the engines being driven by different fluids the engine cycles being thermally coupled combustion heat from one cycle heating the fluid in another cycle
    • F01K23/10—Plants characterised by more than one engine delivering power external to the plant, the engines being driven by different fluids the engine cycles being thermally coupled combustion heat from one cycle heating the fluid in another cycle with exhaust fluid of one cycle heating the fluid in another cycle
    • 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
    • F01K7/22—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 the turbines having inter-stage steam heating
    • 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
    • F01K7/34—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 of extraction or non-condensing type; Use of steam for feed-water heating
    • F01K7/38—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 of extraction or non-condensing type; Use of steam for feed-water heating the engines being of turbine type
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E20/00—Combustion technologies with mitigation potential
    • Y02E20/14—Combined heat and power generation [CHP]
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E20/00—Combustion technologies with mitigation potential
    • Y02E20/16—Combined cycle power plant [CCPP], or combined cycle gas turbine [CCGT]

Definitions

  • Converting an existing steam turbine plant to provide a retroactive steam extraction capability, in particular for tapping low-pressure steam can be very complicated and labor-intensive, however.
  • the dimensions of the power house may not be sufficiently large to accommodate the additional piping for extracting the steam, or the steam turbine or, as the case may be, the power station process is not suitably configured for steam extraction.
  • steam turbines having a separate casing for the medium- and low-pressure stages it is at least easily possible to tap low-pressure steam at the overflow line.
  • steam turbines having a medium- and low-pressure stage housed in a single casing on the other hand, it is often not feasible to carry out retrofits in order to extract the large volume of steam required, for which reason the turbine has to be replaced in this situation.
  • the low-pressure section needs to be adapted to handle the changed swallowing capacity (steam volume flow).
  • Extracting steam from other sources within the power station process is often likewise not cost-effective or possible in a suitable manner.
  • extracting steam from a reheat line of the steam turbine leads to load imbalance in the boiler if no further expensive and complex measures are taken.
  • Extracting higher-value steam for the carbon dioxide separator must also be ruled out unless further measures are undertaken, since this leads to unacceptable energy losses.
  • the object of the invention is therefore to disclose a method for retrofitting a steam extraction capability in order to tap steam from the steam process of a fossil-fired power plant, which capability can be realized in a simple and cost-effective manner, and which in addition is thermodynamically favorable, so that the efficiency losses due to the additional steam extraction are minimized.
  • the invention permits an extraction point to be chosen which lies outside of the turbine. This enables retrofit capability to be integrated without high initial investments.
  • the use of a back-pressure turbine with extraction points permits multistage heating to be realized, which is more beneficial thermodynamically than single-stage heating.
  • this retrofit concept permits retroactive thermodynamic optimization, since the extractions are only specified at the time of the retrofitting.
  • the heating steam extraction is decoupled from the main process through the use of the back-pressure steam turbine. Because the back-pressure steam turbine is not supplied until the time of conversion, no extraction points need to be provided on the main steam turbine. This means that retrofitting is possible even in a power station in which heating steam extraction was not included in the planning at the time of installation. In this case, however, it might be necessary to carry out a modification to the low-pressure turbine.
  • the steam extraction line is connected to a reheat line.
  • a deactivation of the steam extraction function the low-pressure steam continues to be tapped from the overflow line.
  • an auxiliary condenser is connected in parallel with the steam extraction line. The auxiliary condenser is provided so that in the event of failure or intentional deactivation of the steam extraction function the accumulating excess steam will be condensed in the auxiliary condenser.
  • FIG. 1 is a schematic diagram of a steam turbine arrangement comprising a back-pressure steam turbine according to the invention
  • FIG. 2 is a schematic diagram of a steam turbine arrangement having steam extraction from the overflow line according to the prior art.
  • FIG. 2 shows a steam turbine arrangement having steam extraction from the overflow line according to the prior art.
  • the steam extraction serves in this case to provide a district heating supply using two heating condensers HZ-K.
  • the district heating system is connected to the gas and steam turbine power plant via the overflow line of the steam turbine.
  • steam (NAA) is extracted and ducted by way of a steam line from the power house UMC to the district heating building UND.
  • the actual district heating system in the form of 2 ⁇ 50% heating condensers is located in the district heating building UND.
  • provision of the district heating is effected using a single stage.
  • the two district heating preheaters in combination can thermally transfer 265 MW at the maximum into the district heating system during normal operation.
  • the district heating system can also be operated with steam from the cold reheat cycle (KZÜ) (emergency operation during steam turbine downtime). Capacity transfer into the district heating grid is thermally limited in this case.
  • KZÜ cold reheat cycle
  • the district heating return-circuit water that is to be heated is provided at the transfer point at a pressure of approx. 5-22 bar and flows via the two steam-heated district heating preheaters (HzVW1 and HzVW2) back into the district heating flow line to the district heating loads.
  • the district heating flow line and the district heating return line can each be separated from the district heating water grid by means of a motorized butterfly valve.
  • Each HzVW can be shut off individually by means of a manually operated shutoff valve on the input side and by means of a motorized butterfly valve on the output side. They possess a common bypass fitted with a motorized valve.
  • the steam for the two HzVWs is tapped during steam turbine operation from the overflow line to the low-pressure (ND) steam turbine (DT) by way of a motorized bleeder valve.
  • ND low-pressure
  • DT low-pressure steam turbine
  • Two nonreturn valves in the line prevent backflow to the DT.
  • a steam inspection probe monitors compliance with the maximum permitted pressure in this line. If the set value is exceeded the medium-pressure (MD) ⁇ DT quick-action shutoff valve is closed.
  • MD medium-pressure
  • DT steam extraction lines are drained via drainage lines fitted with motor-driven shutoff valves to the condenser MAG and preheated.
  • the HzVWs are connected to the system in a staggered manner:
  • the bypass of the HzVWs is set to fully open before the district heating steam extraction process is placed into service.
  • the control butterfly valves at the outlet of the HzVWs are closed and the heat extraction begins with the opening of the outlet valve of the HzVW1. After the open position is reached the control butterfly valve in the bypass closes in a controlled manner in order to increase the district heating capacity.
  • the control butterfly valve at the outlet of the HzVW2 is opened in a controlled manner and, as previously in the case of HzVW1, closes the control butterfly valve in the HzVW as the demand for heat increases further until the entire volume flows through the HzVWs. If both HzVWs are in operation with the bypass closed and the requirement for heating capacity continues to increase, the steam pressure in both HzVWs is raised with the aid of the control butterfly valve in the overflow line to the ND turbine and as a result the heat output is increased in a controlled manner.
  • bypass operation of the steam turbine the steam is tapped from the KZÜ by way of a steam converter station.
  • a steam inspection probe monitors to ensure compliance with the maximum permitted pressure on the low-pressure side.
  • the injection water for cooling the steam of the steam converter station is taken from the condensate system downstream of the condensate pumps. In order to protect against contamination of the injection control fittings the injection water lines are fitted with an upstream dirt strainer. In addition the section of pipeline up to the control valve may be protected by means of a safety valve in certain cases in order to ensure it cannot be damaged due to heating of the enclosed condensate.
  • the steam lines upstream of the steam converter stations are preheated and drained to the drainage system LCM via drainage lines fitted with motor-driven shutoff valves. As the requirement for district heating capacity decreases the HzVWs are powered down in precisely the reverse order to the connection sequence.
  • the condensate in the HzVWs drains off geodetically or due to the pressure difference into the main condenser, being ducted in the process through a main condensate preheater in order thereby to operate more energy-efficiently.
  • a control valve in the drain line keeps the fill level in the HzVWs constant within the predefined limits.
  • the two HzVWs remain under pressure on the hot water side when the district heating system is not in operation so that an escape of steam is reliably prevented.
  • Both HzVWs are fitted with a safety valve on the hot water side in order to discharge the expanding heating water in the event of heating and enclosed medium. Valves and fittings that are operated in the vacuum range have a water seal adapter or are implemented with vacuum-tight stems.
  • the impulse lines of the fill level measurements of the HzVWs are kept filled at all times by way of bubbler lines.
  • a safety valve is installed on both HzVWs in order to enable the accumulating heating water to be ducted away in the event of pipeline rupture or leaks.
  • the district heating system according to FIG. 2 has the following tasks:
  • the district heating system consists of the following main components:
  • FIG. 1 shows a steam turbine arrangement comprising a back-pressure steam turbine according to the invention.
  • the district heating system is connected to the gas and steam turbine plant exactly as in FIG. 2 .
  • Steam (NM) is extracted from the overflow line of the steam turbine (DT) and ducted by way of a steam line from the power house UMC to the district heating building UND.
  • a heating steam turbine including all ancillary equipment necessary for operation, such as e.g. lubricating oil system, evacuation system and drainage facilities.
  • the steam from the NM system is ducted either to the steam turbine only or additionally to a third heating condenser (HzVW3).
  • the heating power output of the district heating system is realized in up to three stages depending on the district heating capacity required. Accordingly, two or even three heating condensers are operated on the steam side as a function of demand.
  • a heating condenser (HzVW1 and HzVW2) is located under each steam turbine outflow. Operating in combination at maximum steam turbine load, these heating condensers can transfer, for example, 120 MW equivalent thermal energy from the NM steam system into the district heating grid. If an increased steam output of more than 120 MW equivalent thermal energy is to be extracted, steam is injected into the heating condenser 3 (HzVW3) in addition. The latter is supplied directly with steam from the NM system. Alternatively the district heating system can also be operated with steam from the cold reheat cycle (KA) (emergency operation during steam turbine downtime). Capacity transfer into the district heating grid is thermally limited to, for example, 220 MW in this case.
  • KA cold reheat cycle
  • the entire district heating output can be transferred into the district heating grid by way of the HzVW3.
  • the steam supply to the heating steam turbine is interlocked and the steam is supplied exclusively to the HzVW3.
  • the district heating system according to FIG. 1 has the following tasks:
  • the district heating system consists of the following main components:
  • the district heating system can be housed in a separate building UND.
  • a larger district heating building may be necessary on account of the increased space requirement for the heating steam turbine incl. ancillary equipment.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Control Of Turbines (AREA)
  • Engine Equipment That Uses Special Cycles (AREA)
US13/991,709 2010-12-08 2011-11-28 Retrofitting a heating steam extraction facility in a fossil-fired power plant Abandoned US20130247571A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE102010062623A DE102010062623A1 (de) 2010-12-08 2010-12-08 Verfahren zum Nachrüsten einer fossil befeuerten Kraftwerksanlage mit Heizdampfentnahme
DE102010062623.6 2010-12-08
PCT/EP2011/071180 WO2012076355A2 (de) 2010-12-08 2011-11-28 Nachrüsten einer heizdampfentnahme bei einer fossil befeuerten kraftwerksanlage

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US (1) US20130247571A1 (de)
EP (1) EP2627874A2 (de)
KR (1) KR20130139326A (de)
CN (1) CN103403303A (de)
DE (1) DE102010062623A1 (de)
RU (1) RU2013130993A (de)
WO (1) WO2012076355A2 (de)

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US20150308294A1 (en) * 2013-01-10 2015-10-29 Panasonic Intellectual Property Management Co., Ltd. Rankine cycle apparatus and combined heat and power system
CN108952844A (zh) * 2018-07-13 2018-12-07 哈尔滨汽轮机厂有限责任公司 一种200mw超高压背压式汽轮机
CN109488397A (zh) * 2018-12-27 2019-03-19 大唐贵州发耳发电有限公司 一种凝汽式汽轮机的轴封溢流汽热量回收系统
EP3533976A1 (de) * 2018-03-01 2019-09-04 Siemens Aktiengesellschaft Anlage mit entnahmekondensationsturbine und orc-prozess
CN113914948A (zh) * 2021-10-15 2022-01-11 国能龙源蓝天节能技术有限公司上海分公司 一种利用旁路供热实现热电机组深度调峰的系统以及方法

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CN103835778A (zh) * 2014-03-13 2014-06-04 俞述茜 一种发电系统
CN110847977B (zh) * 2019-11-25 2022-05-10 东方电气集团东方汽轮机有限公司 一种适用于干旱地区的高背压供热系统
CN113464225B (zh) * 2021-07-05 2022-06-21 西安交通大学 带两级蒸汽喷射器的电厂宽负荷运行的系统及方法

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Publication number Priority date Publication date Assignee Title
US20150308294A1 (en) * 2013-01-10 2015-10-29 Panasonic Intellectual Property Management Co., Ltd. Rankine cycle apparatus and combined heat and power system
US9638066B2 (en) * 2013-01-10 2017-05-02 Panasonic Intellectual Property Management Co., Ltd. Rankine cycle apparatus and combined heat and power system
EP3533976A1 (de) * 2018-03-01 2019-09-04 Siemens Aktiengesellschaft Anlage mit entnahmekondensationsturbine und orc-prozess
WO2019166160A1 (de) * 2018-03-01 2019-09-06 Siemens Aktiengesellschaft Anlage mit entnahmekondensationsturbine und orc-prozess
CN108952844A (zh) * 2018-07-13 2018-12-07 哈尔滨汽轮机厂有限责任公司 一种200mw超高压背压式汽轮机
CN109488397A (zh) * 2018-12-27 2019-03-19 大唐贵州发耳发电有限公司 一种凝汽式汽轮机的轴封溢流汽热量回收系统
CN113914948A (zh) * 2021-10-15 2022-01-11 国能龙源蓝天节能技术有限公司上海分公司 一种利用旁路供热实现热电机组深度调峰的系统以及方法

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Publication number Publication date
RU2013130993A (ru) 2015-01-20
WO2012076355A3 (de) 2013-07-25
CN103403303A (zh) 2013-11-20
WO2012076355A2 (de) 2012-06-14
KR20130139326A (ko) 2013-12-20
DE102010062623A1 (de) 2012-06-14
EP2627874A2 (de) 2013-08-21

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