US20150000249A1 - Combined cycle power plant - Google Patents

Combined cycle power plant Download PDF

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Publication number
US20150000249A1
US20150000249A1 US14/488,788 US201414488788A US2015000249A1 US 20150000249 A1 US20150000249 A1 US 20150000249A1 US 201414488788 A US201414488788 A US 201414488788A US 2015000249 A1 US2015000249 A1 US 2015000249A1
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United States
Prior art keywords
steam
supplied
steam turbine
plant
turbine plant
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Abandoned
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US14/488,788
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English (en)
Inventor
Richard Carroni
Alvin Limoa
David Olsson
Joerg Dietzmann
Camille Pedretti
Tjiptady NUGROHO
Enrico Conte
Gian Luigi Agostinelli
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General Electric Technology GmbH
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Alstom Technology AG
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Publication date
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Publication of US20150000249A1 publication Critical patent/US20150000249A1/en
Assigned to ALSTOM TECHNOLOGY LTD reassignment ALSTOM TECHNOLOGY LTD ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: Dietzmann, Joerg, CONTE, ENRICO, CARRONI, RICHARD, AGOSTINELLI, Gian Luigi, PEDRETTI, CAMILLE, LIMOA, Alvin, NUGROHO, TJIPTADY, OLSSON, DAVID
Abandoned 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
    • 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
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02C—GAS-TURBINE PLANTS; AIR INTAKES FOR JET-PROPULSION PLANTS; CONTROLLING FUEL SUPPLY IN AIR-BREATHING JET-PROPULSION PLANTS
    • F02C6/00—Plural gas-turbine plants; Combinations of gas-turbine plants with other apparatus; Adaptations of gas-turbine plants for special use
    • F02C6/18—Plural gas-turbine plants; Combinations of gas-turbine plants with other apparatus; Adaptations of gas-turbine plants for special use using the waste heat of gas-turbine plants outside the plants themselves, e.g. gas-turbine power heat plants
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/14—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by absorption
    • B01D53/1456—Removing acid components
    • B01D53/1475—Removing carbon dioxide
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/34—Chemical or biological purification of waste gases
    • B01D53/46—Removing components of defined structure
    • B01D53/62—Carbon oxides
    • 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
    • F01K13/006—Auxiliaries or details not otherwise provided for
    • 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
    • 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
    • F01K23/08—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 working fluid of one cycle heating the fluid in another cycle
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2252/00—Absorbents, i.e. solvents and liquid materials for gas absorption
    • B01D2252/20—Organic absorbents
    • B01D2252/204—Amines
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2257/00—Components to be removed
    • B01D2257/50—Carbon oxides
    • B01D2257/504—Carbon dioxide
    • 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
    • Y02C—CAPTURE, STORAGE, SEQUESTRATION OR DISPOSAL OF GREENHOUSE GASES [GHG]
    • Y02C20/00—Capture or disposal of greenhouse gases
    • Y02C20/40—Capture or disposal of greenhouse gases of CO2
    • 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]
    • 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]
    • Y02E20/18—Integrated gasification combined cycle [IGCC], e.g. combined with carbon capture and storage [CCS]
    • 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
    • Y02E20/32—Direct CO2 mitigation

Definitions

  • the present invention relates to a combined cycle power plant (CCPP) comprising a gas turbine plant, a heat recovery steam generator (HRSG) heated with hot exhaust gases from the gas turbine plant, and a steam turbine plant driven by the generated steam.
  • CCPP combined cycle power plant
  • HRSG heat recovery steam generator
  • Such a CCPP is shown in U.S. Pat. No. 5,839,269.
  • a steam turbine plant is provided with a high pressure turbine, a medium pressure turbine and a low pressure turbine, whereby high pressure and medium pressure steam is produced in the steam generator for driving the high pressure or medium pressure turbine, and the steam expanded in the medium pressure turbine is used to drive the low pressure turbine.
  • steam with reduced low pressure can be channeled off from a sufficiently hot feed water tank of the steam generator and fed into a medium stage of the low pressure turbine through appropriate steam inlets.
  • U.S. Pat. No. 5,839,269 discloses a range of measures for optimizing the design of gas turbine plants and for optimizing the operation of gas turbines.
  • Gas turbine plants and other large combustion plants are typically operated with fuels based on hydrocarbons. This inevitably generates carbon oxides during operation, especially carbon dioxide, which is a green house gas and harmful to the environment, and should therefore be separated from the waste gases of the gas turbine plant.
  • known waste gas purification plants can be used which are arranged downstream of the respective combustion process and which have an absorbing section and a regenerating section. Carbon dioxide which is carried along within the absorbing section, through which the particular waste gases are flowing, can be absorbed at relatively low temperature using an amine-H 2 O-system with the formation of a relatively concentrated amine carbonate solution.
  • the concentrated amine carbonate solution can be subsequently converted in a regeneration section at high temperature into a relatively weak concentration amine-carbonate-solution, whereby carbon dioxide is released and led away and subsequently collected and stored.
  • amine systems for example systems using chilled ammonia, can also be used.
  • the purpose of the invention is thereby to connect a CCPP with a waste gas purification plant in an optimized way to supply the necessary thermal energy for heating the regeneration section of the purification plant and to use the residual heat for increasing the performance of the steam turbine plant.
  • a waste gas purification plant is provided downstream of the gas turbine plant and the heat recovery steam generation plant, the gas purification plant comprising an absorbing section and a regenerating section, whereby inside the absorbing section, through which the waste gases flow, carbon dioxide which is carried in the waste gases is absorbed by an amine-H 2 O-system at relatively low temperature forming (relatively) high concentrations of amine carbonate solution, and whereby the concentrated amine carbonate solution is converted into a relatively weak amine carbonate solution in the regeneration section at an elevated temperature giving off carbon dioxide which is led away, whereby the regeneration section can be heated with steam, and the relatively weak amine carbonate solution generated in the regeneration section having an elevated temperature can be supplied via a heat exchanger back into the absorbing section for reuse, and thermal energy can be exchanged in the heat exchanger between the relatively weak concentration of amine carbonate solution and the relatively high concentration of amine carbonate solution being supplied to the regeneration section.
  • the heat for the regeneration of the amine solution is introduced into the regeneration section by way of steam from the steam turbine and/or the steam generator, and the heat from the regenerated amine solution, having an elevated temperature, is used for preheating the high concentration amine carbonate solution led away from the absorbing section.
  • the thermal energy required for regeneration of the amine solution can thereby be substantially reduced.
  • the regeneration section is heated with saturated steam at a specified temperature. It is advantageous that the temperature level is only dependent on the steam pressure, so that the desired temperature can be regulated with the steam pressure.
  • the steam for heating the regeneration section can be taken from the connection between the outlet of the medium pressure turbine and the inlet of the low pressure turbine.
  • the hot condensate generated from heating the regeneration section can be supplied to an evaporator of the heat recovery steam generator in order to produce additional steam with low pressure, the steam can then be supplied to a stage of the low pressure turbine, whereby this steam can, if necessary, be channeled through a superheater of the steam generator before being introduced into the low pressure turbine, in order to increase its power output.
  • the thermal energy which may need to be conducted away from the absorbing section, can be used to preheat the feed water for the steam generator.
  • the steam circuits therefore only need to be slightly modified, according to the invention, to supply the necessary thermal energy for the waste gas purification plant and/or to use resulting residual heat for increasing the performance of the steam turbine plant, i.e. the hot condensate is used in a new, additional pressure level (compared to the standard water-steam cycle.
  • the regeneration of the amine solution in the regeneration section can be carried out at a temperature of 126° C. as opposed to a possible process temperature of about 145° C., whereby the separation of the carbon dioxide out of the high concentration amine carbonate solution supplied to the regeneration section happens at a less than optimal process temperature.
  • This is accepted here because the necessary thermal energy for heating the regeneration section is thereby disproportionally reduced, so that the performance of the CCPP and its efficiency can be substantially increased.
  • only a relatively small loss of performance must be tolerated compared to a CCPP without downstream waste gas purification.
  • the hot condensate or pressurized water is supplied to at least one flash evaporator and allowed at least partly to evaporate there at low pressure so that additional steam is released for operating the steam turbine plant, in particular for the low pressure steam turbine of the steam turbine plant.
  • Usable steam for operating the low pressure turbine of the steam turbine plant is produced with little effort by introducing hot condensate or pressurized water into the at least one flash boiler, where it boils due to a fast reduction in pressure and evaporates.
  • the physical effect is thereby exploited whereby the boiling point of a liquid is dependent on pressure, and accordingly a hot liquid starts to boil suddenly when it is introduced into a space having low pressure and therefore at least partially evaporates.
  • a series of flash boilers can be provided, whereby pressurized water or condensate from a first flash boiler is supplied to a second flash boiler which has a lower inner pressure compared to the first flash boiler, so that the pressurized water or condensate, coming out of the first flash boiler, can at least partially evaporate here.
  • further flash boilers can be arranged in a cascade. The flash boilers in the flash boiler cascade thereby produce steam with accordingly different pressure levels, whereby the steam of each flash boiler is supplied to an appropriate stage of the turbine, in particular to the low pressure turbine of the steam turbine plant.
  • the steam coming from a flash boiler can, if necessary, be superheated with the heat recovery steam generator plant of the CCPP in order to drive the respective turbine section more effectively.
  • FIG. 1 a highly schematized representation of a CCPP according to the invention
  • FIG. 2 a schematized representation of a waste gas purification plant according to the invention
  • FIG. 3 a representation of an advantageous connection of the regeneration section of the waste gas purification plant to a CCPP or its steam generator or its low pressure steam turbine of the steam turbine plant
  • FIG. 4 a schematized representations for the use of a hot condensate or pressurized water from the power plant or waste gas purification plant
  • FIG. 5 an advantageous variation of the arrangement shown in FIG. 3 .
  • the CCPP comprises a gas turbine plant 1 , which can have a generally known construction, for example as in the above mentioned U.S. Pat. No. 5,839,269, and having a compressor 11 , at least one combustion chamber 12 and a gas turbine 13 .
  • the hot waste gases 100 of the gas turbine plant 1 then flow through a heat recovery steam generator 2 .
  • a waste gas purification plant 4 Arranged downstream of the heat recovery steam generator 2 is a waste gas purification plant 4 , which is described below.
  • the steam produced in the heat recovery steam generator 2 drives a steam turbine plant 5 .
  • the gas turbine plant 1 and the steam turbine plant 5 can drive generators 3 or the like respectively, whereby it is possible in principle to couple the rotor shafts R of the gas turbine plant 1 with those of the steam turbine plant 5 and use a common generator 3 .
  • a steam circuit For driving the steam turbine plant 5 a steam circuit can be provided as described in the following:
  • Water is fed by a pump 7 from a feed water tank 6 into a heater 8 , which is arranged inside of a heat recovery steam generator 2 in the waste gas path.
  • a heater 8 At the outlet of the heater 8 there is high pressure water with, for example, a pressure of 160 bar and a temperature of 300° C.
  • a tube register 9 downstream of the heater 8 the high pressure water is evaporated and superheated, so that high pressure steam is available at the outlet of the tube register 9 .
  • This superheated, high pressure steam is supplied to a high pressure steam turbine 51 of the steam turbine plant 5 , whereby the high pressure steam expands inside the high pressure turbine 51 .
  • the steam expanded in this way, CRH (Cold Reheat), is subsequently supplied through a further tube register 10 , so that this steam is reheated.
  • the steam from the tube register 10 is supplied to a medium pressure turbine 52 of the steam turbine plant 5 , whereby the steam expands in the medium pressure turbine 52 so that there is low pressure steam downstream of it, which, if necessary, can be further heated in a tube register (not shown) and supplied to a low pressure turbine 53 of the steam turbine plant 5 .
  • the steam expanded in the low pressure turbine 53 subsequently flows into an air- or water-cooled condenser 109 .
  • the condensate produced there is then supplied by a pump 111 back to the feed water tank 6 .
  • the waste gas purification plant 4 comprises an absorbing section 41 through which the waste gas flows, and a regeneration section 42 in order to regenerate the absorbing medium from section 41 and to supply it back to the absorbing section 41 .
  • a regeneration section 42 in order to regenerate the absorbing medium from section 41 and to supply it back to the absorbing section 41 .
  • waste gases 1000 free of carbon oxides.
  • the waste gases 100 flow through a bath of water and amine solution, whereby the carbon dioxide in the waste gases 100 is bonded by the water to form carbonic acid, which with the amines then forms a relatively high concentration of amine carbonate solution.
  • This relatively high concentration of amine carbonate solution is supplied to the regeneration section 42 by a pump 113 .
  • a high temperature is maintained, for example a temperature from about 120° to 145° C., at which the relatively high concentration of amine carbonate solution is converted into a relatively weak concentration of amine carbonate solution, giving off carbon dioxide in the process, whereby the carbon dioxide is supplied by a compressor 114 to a store or the like (not shown).
  • the temperature necessary for the regeneration process in the regeneration section 42 can be maintained by circulating the relatively weak concentration of amine carbonate solution, produced in the regeneration section 42 , in a circuit through a heater 115 , which is itself heated with steam as described below.
  • the relatively weak concentration of amine carbonate solution is supplied back to the absorbing section 41 by a pump 116 , whereby on returning the solution flows through a heat exchanger 112 through which the relatively high concentration of amine carbonate solution being supplied to the regeneration section 42 also flows (in opposite directions), so that the high concentration of amine carbonate solution supplied to the regeneration section 42 is pre-heated and the heater 115 requires a relatively low thermal input for maintaining the necessary temperature for the regeneration process.
  • the heater 115 of the regeneration section 42 is preferably heated with steam, in particular saturated steam, which can be diverted off at point A in FIG. 1 in the steam path between the medium pressure steam turbine 52 and the low pressure steam turbine 53 of the steam turbine plant 5 .
  • This channeled off steam condenses at or in the heater 115 whilst giving up heat to the relatively low concentration amine carbonate solution.
  • the thereby generated condensate K the temperature of which is around the operating temperature of the regeneration section 42 , i.e. at a temperature between about 120° C. and 145° C., can then be supplied according to FIG. 3 to an evaporator 118 and therein heated with heat from the heat recovery steam generator 2 .
  • the steam generated there, the pressure of which is below the pressure of the steam supplied to the inlet of the low pressure steam turbine can be subsequently superheated and supplied via appropriate steam inlets to an intermediate stage of the low pressure steam turbine 53 .
  • the steam produced by the evaporator 118 can be supplied to the heater 115 together with the steam channeled off from point A, preferably superheated.
  • the dotted line in FIG. 3 shows such option.
  • the condensate K from the heater 115 can also be introduced into the feed water tank 6 so that, on the one hand, the feed water is accordingly heated.
  • the condensate K from the heater 115 is used for producing steam having a very low pressure for introducing into an intermediate stage of the low pressure steam turbine 53 .
  • the waste gas purification plant is therefore used to generate a fourth steam pressure level, in addition to the steam pressure levels for the high, middle, and low pressure steam turbines of the steam turbine plant 5 .
  • the steam turbine plant 5 and the heat recovery steam generator 2 are only slightly modified by the waste gas purification plant 4 .
  • the absorbing section 41 of the waste gas purification plant, through which the hot waste gases 100 flow, must be cooled in order to maintain the necessary low temperature for the absorption process.
  • This temperature is about 40° C. in case of the amine system, and about 5° C. in case of the chilled ammonia process.
  • the hot condensate K from heater 115 is supplied by a pump 116 to the inlet of a flash boiler 117 , whereby a regulating valve 118 is arranged at the inlet of the flash boiler 117 in order to maintain a pressure in the line between the flash boiler 117 and the pump 116 , whereby the pressure is above the boiling pressure of water at the prevailing temperature of the condensate K.
  • the flash boiler 117 there is a lower pressure compared to the pressure in the line between the pump 116 and the flash boiler 117 , so that the condensate K introduced into the flash boiler 117 , to a greater or less extent, immediately evaporates (flashes to steam).
  • the very low pressure steam produced the pressure of which is below the steam pressure at A in the steam path between the medium pressure turbine and the low pressure turbine, can now be supplied to an intermediate stage of the low pressure turbine 53 .
  • the pressure and the quantity of the flashed steam, produced in the boiler 117 can be increased.
  • the very low pressure steam from the flash boiler 117 can be superheated in a heater 119 before it is introduced into the low pressure turbine 53 .
  • the heater 119 can itself be heated with steam from the outlet of the high pressure turbine (CRH) or preferably by flue gas in the heat recovery steam generator (HRSG). In principle any other heat source could also be used.
  • FIG. 5 in place of a single flash boiler 117 , there can be a cascade of flash boilers 117 , 117 ′, 117 ′′, whereby the condensate coming from each flash boiler 117 , 117 ′ is supplied to a subsequent flash boiler 117 ′, 117 ′′ through a further regulating valve 118 ′, 118 ′′, whereby the pressure in the subsequent flash boiler 117 ′, 117 ′′ is lower than the pressure in the preceding flash boiler 117 , 117 ′, so that the condensate supplied to it partially evaporates quickly.
  • the cascade may comprise three flash boilers 117 , 117 ′, 117 ′′, as shown in FIG. 5 .
  • the pump 116 in FIGS. 4 and 5 can be used for increasing the hot condensate (K) pressure, so as to increase the pressure and quantity of the flashed steam.
  • the steam flows, supplied to the low pressure steam turbine, can also be superheated in appropriate heaters 119 , before they are introduced into the low pressure steam turbine 53 .
  • the heater 119 may be heated by steam from any suitable source.
  • This embodiment is based on the general idea that condensed water exiting at relatively high temperature can be (partially) evaporated in flash boilers at low pressure, and the steam produced can be used for driving the steam turbine.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • General Chemical & Material Sciences (AREA)
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  • Oil, Petroleum & Natural Gas (AREA)
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US14/488,788 2012-03-21 2014-09-17 Combined cycle power plant Abandoned US20150000249A1 (en)

Applications Claiming Priority (5)

Application Number Priority Date Filing Date Title
EP12160585.1 2012-03-21
EP12160585 2012-03-21
EP12185806 2012-09-25
EP12185806.2 2012-09-25
PCT/EP2013/055881 WO2013139884A2 (en) 2012-03-21 2013-03-21 Combined cycle power plant

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US (1) US20150000249A1 (ru)
EP (1) EP2828492A2 (ru)
CN (1) CN104254673A (ru)
IN (1) IN2014DN07990A (ru)
WO (1) WO2013139884A2 (ru)

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WO2019084208A1 (en) * 2017-10-25 2019-05-02 Scuderi Group, Inc. RECOVERY CYCLE FEEDING SYSTEM
US10876432B2 (en) * 2015-08-19 2020-12-29 Kabushiki Kaisha Toshiba Combined cycle power system with an auxiliary steam header supplied by a flasher and a surplus steam leak
US11346544B2 (en) * 2019-09-04 2022-05-31 General Electric Company System and method for top platform assembly of heat recovery steam generator (HRSG)
US20230264953A1 (en) * 2021-09-22 2023-08-24 Saudi Arabian Oil Company Integration of power generation with methane reform

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CN105477977A (zh) * 2015-12-25 2016-04-13 武汉旭日华科技发展有限公司 用于活性炭颗粒吸附回收装置的节能方法
EP3219940B1 (en) 2016-03-18 2023-01-11 General Electric Technology GmbH Combined cycle power plant and method for operating such a combined cycle power plant
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EP2828492A2 (en) 2015-01-28
IN2014DN07990A (ru) 2015-05-01

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