US20190203614A1 - Systems and methods for steam reheat in power plants - Google Patents

Systems and methods for steam reheat in power plants Download PDF

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US20190203614A1
US20190203614A1 US15/857,532 US201715857532A US2019203614A1 US 20190203614 A1 US20190203614 A1 US 20190203614A1 US 201715857532 A US201715857532 A US 201715857532A US 2019203614 A1 US2019203614 A1 US 2019203614A1
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Prior art keywords
steam
steam generator
heat exchange
outlet
inlet
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Abandoned
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US15/857,532
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English (en)
Inventor
Eric P. Loewen
Scott E. Rasmussen
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GE Hitachi Nuclear Energy Americas LLC
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GE Hitachi Nuclear Energy Americas LLC
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Publication date
Application filed by GE Hitachi Nuclear Energy Americas LLC filed Critical GE Hitachi Nuclear Energy Americas LLC
Priority to US15/857,532 priority Critical patent/US20190203614A1/en
Assigned to GE-HITACHI NUCLEAR ENERGY AMERICAS LLC reassignment GE-HITACHI NUCLEAR ENERGY AMERICAS LLC ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: LOEWEN, ERIC P., RASMUSSEN, SCOTT E.
Priority to JP2020536263A priority patent/JP7213253B2/ja
Priority to EP18895244.4A priority patent/EP3732392A4/en
Priority to PCT/US2018/050318 priority patent/WO2019133080A1/en
Priority to CA3087040A priority patent/CA3087040A1/en
Publication of US20190203614A1 publication Critical patent/US20190203614A1/en
Priority to US16/914,418 priority patent/US11525374B2/en
Priority to US18/072,592 priority patent/US11828204B2/en
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
    • F01K11/00—Plants characterised by the engines being structurally combined with boilers or condensers
    • F01K11/02—Plants characterised by the engines being structurally combined with boilers or condensers the engines being turbines
    • 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
    • F01K19/00—Regenerating or otherwise treating steam 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
    • 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
    • F01K7/345—Control or safety-means particular thereto
    • 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
    • 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
    • F01K7/44—Use of steam for feed-water heating and another purpose
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F22—STEAM GENERATION
    • F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
    • F22B1/00—Methods of steam generation characterised by form of heating method
    • F22B1/02—Methods of steam generation characterised by form of heating method by exploitation of the heat content of hot heat carriers
    • F22B1/023—Methods of steam generation characterised by form of heating method by exploitation of the heat content of hot heat carriers with heating tubes for nuclear reactors, as long as they are not classified according to a specified heating fluid, in another group
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F22—STEAM GENERATION
    • F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
    • F22B1/00—Methods of steam generation characterised by form of heating method
    • F22B1/02—Methods of steam generation characterised by form of heating method by exploitation of the heat content of hot heat carriers
    • F22B1/06—Methods of steam generation characterised by form of heating method by exploitation of the heat content of hot heat carriers the heat carrier being molten; Use of molten metal, e.g. zinc, as heat transfer medium
    • F22B1/063—Methods of steam generation characterised by form of heating method by exploitation of the heat content of hot heat carriers the heat carrier being molten; Use of molten metal, e.g. zinc, as heat transfer medium for metal cooled nuclear reactors
    • G—PHYSICS
    • G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
    • G21D—NUCLEAR POWER PLANT
    • G21D1/00—Details of nuclear power plant
    • G21D1/006—Details of nuclear power plant primary side of steam generators
    • G—PHYSICS
    • G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
    • G21D—NUCLEAR POWER PLANT
    • G21D5/00—Arrangements of reactor and engine in which reactor-produced heat is converted into mechanical energy
    • G21D5/04—Reactor and engine not structurally combined
    • G21D5/08—Reactor and engine not structurally combined with engine working medium heated in a heat exchanger by the reactor coolant
    • G21D5/12—Liquid working medium vaporised by reactor coolant
    • G—PHYSICS
    • G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
    • G21D—NUCLEAR POWER PLANT
    • G21D5/00—Arrangements of reactor and engine in which reactor-produced heat is converted into mechanical energy
    • G21D5/04—Reactor and engine not structurally combined
    • G21D5/08—Reactor and engine not structurally combined with engine working medium heated in a heat exchanger by the reactor coolant
    • G21D5/12—Liquid working medium vaporised by reactor coolant
    • G21D5/16—Liquid working medium vaporised by reactor coolant superheated by separate heat source
    • 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
    • Y02E30/00—Energy generation of nuclear origin

Definitions

  • FIG. 1 is a schematic illustration of primary and secondary heat transfer medium loops in a relevant power plant for electricity generation.
  • a heat source 1 generates energy that is transmitted to a heat transfer medium.
  • Heat source 1 may be a coal-fired boiler or pressure vessel, light water nuclear reactor, liquid sodium fast reactor, etc.
  • the heat transfer medium flows in a primary loop through source 1 including hot leg or outlet 2 and cold leg or feed 3 between source 1 and heat exchanger 10 .
  • exchanger 10 being a steam generator for a light water reactor, water may be heated in reactor 1 through fission and driven into pipes forming outlet 2 , then passed into steam generator as heat exchanger 10 .
  • cooled feedwater from an exit of exchanger 10 may be pumped by main feedwater pumps back into reactor 1 via feed 3 to repeat the cycle.
  • a secondary heat transfer medium loop is formed by feed or heat exchanger inlet 13 and outlet 12 flowing through heat exchanger 10 . Energy from the primary loop is transferred to the secondary loop in heat exchanger 10 .
  • condensed feedwater is pumped from a condenser or other source through inlet 13 , converted to steam transferred from the heat of the primary loop in the steam generator, and then fed to outlet 12 to power turbines or other uses.
  • Condensed or otherwise cooled heat transfer medium may be provided to inlet 13 from the turbines via a condenser ejecting excess heat to a heat sink such as a lake or river.
  • One or more turbines may extract energy from the heat transfer medium exiting heat exchanger 10 via outlet 12 .
  • many plants use staged turbines in series, such as intermediate pressure turbine 30 and low pressure turbine 40 to successively extract energy from the heat transfer fluid and drive generator 50 .
  • High pressure turbine 20 may also be used with intermediate and lower pressure turbines 30 and 40 in the instance that a saturated fluid from outlet 12 can undergo multiple efficient extractions in each turbine 20 , 30 , 40 .
  • the heat transfer medium finally exiting each turbine may be passed through the condenser or other heat sink and provided back in the loop via inlet 13 .
  • FIGS. 2A and 3B are illustrations of related art liquid sodium steam generators 10 useable as heat exchangers in the system of FIG. 1 .
  • Sodium or other liquid metals and salts may be used as a primary loop heat exchange fluid in fast reactors, while water/steam may be provided in the secondary loop for electricity generation.
  • high-temperature sodium enters a top of steam generator 10 via sodium outlet 2 coming from the reactor, and lower-temperature sodium exits a bottom of steam generator 10 to inlet 3 returning to the reactor.
  • Water may take an opposite route, flowing as condensed liquid into a bottom of steam generator inlet 13 and out as saturated or super-saturated steam from steam generator outlet 12 at a top of steam generator 10 .
  • several channels 31 may divide the incoming liquid water into several, potentially over a hundred, different individual flows from inlet 13 into a same number of heat exchange tubes 32 .
  • the liquid water flows straight up through heat exchange tubes 32 and boils as it absorbs heat from liquid sodium passing downward inside body 11 around tubes 32 in steam generator 10 .
  • Tubes 32 are uniform to ensure even heat transfer and ease fabrication and replacement through uniform design.
  • the liquid sodium is concomitantly cooled as it passes downward in body 11 over heat exchange tubes 32 and ultimately exits steam generator 10 as cooler liquid sodium.
  • Example embodiments heat exchanges and power plants using the same to transfer energy from a primary heat source and heat exchange fluid, like a coal burner, pressurized water reactor, fast sodium reactor, etc., to a secondary heat exchange fluid from which energy is extracted, such as by a turbine being driven by steam.
  • the heat exchanger may be a steam generator when the secondary heat exchange fluid is water, and it includes one or more primary conduits for the primary heat exchange fluid and one or more secondary conduits for the secondary heat exchange fluid(s).
  • the conduits may be completely separated so the fluids do not intermix, with distinct inlets and outlets useable in separate primary loops and secondary loops.
  • the secondary conduits may thus discriminate among different fluid sources and destinations.
  • one of the secondary conduits may take in feedwater from a condenser or environmental source
  • another of the secondary conduits may take in steam from a turbine outlet or other source.
  • the water may be boiled to superheated steam in the first conduit, and the steam reheated to dryer or higher quality steam in the second conduit and then dispatched to same or distinct turbines, such as a higher pressure turbine and a turbine with a lower operating pressure, respectively.
  • plants may use valves and other selectors to divert, in desired volumes or amounts, steam and/or water into the steam generator or to other turbines or the environment for load balancing.
  • the secondary conduits are a coiled or helix shape around an interior perimeter of the steam generator immersed in the primary heat exchange fluid and may be specially configured based on fluid source or destination.
  • a conduit taking in water for boiling may have only half the flow area as a conduit taking in steam for reheating.
  • a conduit carrying steam for reheat may include a fixed swirler on its interior perimeter to better mix in any two-phase flow or a rivulet stopper extending inward in a centripetal direction to break up or redirect water rivulets to a hot exterior surface.
  • two conduits may be axially overlapping or nested, with the conduit carrying water for boiling having a smaller radius of curvature to be more central in the steam generator than a steam conduit for reheating steam having a larger radius of curvature.
  • FIG. 1 is a schematic diagram of a related art power plant.
  • FIG. 2A is an exterior profile view of a related art steam generator.
  • FIG. 2B is an interior cross-sectional view of the related art steam generator of FIG. 2A .
  • FIG. 3A is a bottom cross-sectional view of an example embodiment steam generator.
  • FIG. 3B is a profile cross-sectional view of the example embodiment steam generator of FIG. 3A .
  • FIG. 4A is a profile cross-sectional view of an example embodiment steam generator.
  • FIG. 4B is a detail view of the example embodiment steam generator of FIG. 4A .
  • FIG. 5A is a cross-sectional profile view of a heat exchange tube of FIG. 4B .
  • FIG. 5B is a cross-sectional axial view of the heat exchange tube of FIG. 5A .
  • FIGS. 6A-D are cross-sectional axial views of a heat exchange tube at progressive axial positions.
  • FIG. 7 is a perspective exterior view of the example embodiment steam generator of FIGS. 3-4 .
  • FIG. 8 is a schematic diagram of an example embodiment power plant using an example embodiment steam generator.
  • typical steam generators accommodate a single type of input or secondary fluid for heating, usually heated, condensed water to boil to saturated or superheated steam, using heat from a primary fluid.
  • interior heat transfer tubes 32 FIG. 2B
  • each tube may receive the same type of fluid and heat it in a similar manner from any other tube.
  • primary heat for other types inputs, such as reheating lower pressure steam back up to high quality or superheated steam for energy extraction. Instead, these other types of steam in the secondary loop are fed to progressively lower-pressure turbines.
  • Lower pressure turbines like turbine 40 , used prior to condensation for steam that has already been through one or more higher pressure turbines, are generally less cost effective due to lower energy extraction and frequent damage to turbine blades caused by condensation occurring in lower pressure steam.
  • This inefficiency combined with a single path from generator to progressively lower-pressure-generator for the secondary fluid, typically requires several expensive lower pressure turbines 40 to derive sufficient energy from the large amount of lower pressure steam.
  • the Inventors have developed example embodiments and methods described below to address these and other problems recognized by the Inventors with unique solutions enabled by example embodiments.
  • the present invention is steam generators and power production systems using steam generators and methods of using the same.
  • the few example embodiments and example methods discussed below illustrate just a subset of the variety of different configurations that can be used as and/or in connection with the present invention.
  • FIG. 3A is a bottom cross-sectional view of an example embodiment steam generator 100 useable in a power generation plant.
  • generator 100 may be installed with a high-temperature fast reactor having a liquid metal or molten salt coolant, including a PRISM sodium-cooled reactor.
  • example embodiment steam generator 100 may have an exterior shape and size comparable with typical steam generators and heat exchangers, and may directly replace, for example, relevant steam generator 10 ( FIGS. 2A & 2B ).
  • Example embodiment steam generator 100 includes several inlets 2 ( FIG. 7 ), potentially at a top end of exterior body 111 , including primary coolant inlets 2 .
  • the primary inlets may connect to a liquid metal source such as a reactor, in the same configuration as shown by sodium outlets 2 from FIGS. 2A and 2B connecting to steam generator 10 .
  • example embodiment steam generator includes outlets 3 , potentially at a bottom end of exterior body 111 opposite the inlets forming feed 3 ( FIGS. 2A and 2B ) returning to a reactor or other heat source.
  • a heat exchange fluid such as liquid sodium or a molten salt, may flow from the inlets to the outlets inside body 111 , and example embodiment steam generator 100 may be useable to replace steam generators in typical primary coolant loops of heat generating sources, including reactors.
  • Example embodiment steam generator 100 includes water inlet 13 similar to inlet 13 from FIGS. 2A and 2B , where condensed water may enter generator 100 , potentially at a bottom end of body 111 .
  • Multiple water channels 133 divide flow from inlet 13 into several, potentially about one hundred, different flows, each in one channel 133 . Once divided, channels 133 flow into first heat exchange tubes 134 that ascend into steam generator 100 and allow a hot primary coolant, such as liquid sodium, to flow down around heat exchange tubes 134 in an opposite direction.
  • a hot primary coolant such as liquid sodium
  • first heat exchange tubes 134 may be in a helical or coil shape about a central axis of steam generator 100 .
  • Tubes 134 may occupy a central portion of steam generator 100 , where temperature of counter-flowing primary coolant may be hottest, and a radius of curvature of the helix may be tightest, imparting greatest centrifugal motion to the liquid water.
  • First heat exchange tubes 134 may have a relatively smaller cross-sectional flow path than tubes 132 (described below), but may be larger than tubes 32 ( FIG. 2B ), because the coiled arrangement will force liquid water to outside tube walls and enhance heat transfer.
  • first heat exchanger tubes 134 may be approximately 30 millimeters to 50 millimeters in diameter.
  • liquid water from inlet 13 may be super-heated steam, having absorbed significant energy from a primary coolant, such as liquid sodium, pressurized water, etc. flowing around heat exchange tubes 134 .
  • a primary coolant such as liquid sodium, pressurized water, etc. flowing around heat exchange tubes 134 .
  • the high-quality steam exits one or more outlet 12 , similar to outlets 12 shown in FIGS. 2A and 2B useable in several different types of plants, for delivery to a high-pressure steam turbine and generator.
  • three outlets 12 may be used in combination with three inlets 13 for superheated steam and liquid water, respectively.
  • example embodiment steam generator 100 includes a steam inlet 113 where lower-pressure or lower-quality steam, such as steam already passed through one or more turbines, may enter generator 100 in parallel with liquid water into water inlet 13 .
  • Multiple steam channels 131 divide flow from inlet 113 into several, potentially a hundred or more, different flows, each in one steam channel 131 .
  • water channels 133 flow into second heat exchange tubes 132 that ascend into steam generator 100 and allow a hot primary coolant, such as liquid sodium, molten salt, etc. to flow down around second heat exchange tubes 132 in an opposite direction.
  • a hot primary coolant such as liquid sodium, molten salt, etc.
  • outlets 112 useable in several different types of plants, for delivery an intermediate or higher-pressure steam turbine and generator.
  • three outlets 112 may be used in combination with three inlets 113 for reheated steam and low-pressure steam, respectively.
  • second heat exchange tubes 132 may be in a helical or coil shape about a central axis of steam generator 100 .
  • Second heat exchange tubes 132 may occupy an outer portion of steam generator 100 , where less heat from counter-flowing primary coolant may be required to re-saturate and/or superheat the steam, and a radius of curvature of the helix may be wider, allowing the faster steam flow to push water droplets to hotter edged through centrifugal motion.
  • a radius of second heat exchange tubes 132 may be larger than that of first heat exchange tubes 134 , potentially up to 50 or 100% larger, such as approximately 45 to 100 millimeters in diameter, for example, to reduce pressure drop in the steam and permit higher-pressure steam output.
  • FIG. 4B is a detail illustration of the detail A of FIG. 4A , showing a transition of channels 131 into a coiled shape for second heat exchange tubes 132 proceeding upward about a center of the steam generator.
  • Second heat exchange tubes 132 and steam channels 131 may include one or more features to enhance reheating and drying of a lower-quality steam flowing through the same.
  • one or more rivulet stoppers 142 may protrude into each second heat exchange tube 132 to stop rivulets of water in the steam flow.
  • rivulet stoppers 142 may be a blunt insert at weld joints 135 in tubes 132 protruding up to 15% into the flow path from the outer radius of tubes 132 .
  • FIG. 5B is a cross-sectional illustration in the axial direction taken along line B-B′ of FIG.
  • Rivulet stoppers 142 in this way break up water droplets or rivulets or redirect them to a hot surface of tubes 132 .
  • fixed swirlers 141 in one or more steam channels 131 may impart an internal rotation or swirl to the steam flowing therein.
  • Fixed swirlers 141 may be two thin, welded divider sheets that separate flow area of channels 131 into four flows 1 - 4 , seen in FIGS. 6A-D .
  • Fixed swirlers 141 may have a pitch-to-diameter ratio of about 3 to about 6 to drive any water droplets to outside perimeter of channels 131 and improve heat transfer and re-evaporation even if lower quality or under-saturated steam enters steam inlet 113 . As seen from FIG.
  • rotation of swirlers 141 through axial distance may rotate the distinct flows 1 - 4 through a complete rotation before exiting swirlers 141 in channel 131 .
  • denser water droplets may be centrifugally driven to hot edges of channel 131 out of a two-phase steam flow to improve vaporization and steam quality.
  • FIG. 7 is a perspective illustration of an exterior of example embodiment steam generator 100 showing several inlets and outlets.
  • example embodiment steam generator 100 may thus receive secondary coolant from multiple sources, including both condensed, liquid water and steam, for example, through inlets 13 and 113 and concurrently heat both fluids to higher-quality fluids, such as superheated steam, for use in appropriate turbines, including more efficient non-low-pressure turbines.
  • secondary fluids capable of absorbing more heat like condensed water in an interior position with tighter curvature helix, and fluids with that absorb less heat like low pressure or saturated steam in an exterior position with looser curvature helix steam generator 100 may efficiently generate higher quality steam from multiple sources useable in higher-pressure turbines. As seen in FIGS.
  • the helical arrangement may allow the use of fewer tubes 132 and 134 overall compared to conventional steam turbines, and such tubes 132 and 134 may be larger in diameter, reducing manufacturing complexity, costs, and risk of steam tube failure due to fewer tubes.
  • example embodiment steam generator 100 may include several outlets 12 , similar to outlet 12 from FIGS. 2A and 2B , to distribute superheated steam generated from liquid water. Steam generator 100 may also include outlets 112 to connect reheated steam generated from lower pressure steam to desired destinations, potentially based on expected steam type. For example, each outlet 12 and 112 may connect to a high pressure turbine or may each connect to a different turbine. Similarly, outlets may be connected based on expected steam type or path through generator 100 . For example, for every three outlets 12 that carry superheated steam produced from liquid condenser water may flow to a high pressure turbine, one outlet 112 may carry potentially lower-quality or lower-pressure steam to an intermediate or lower pressure turbine, all from example embodiment steam generator 100 .
  • Example embodiment steam generator 100 may be fabricated of resilient materials that are compatible with a nuclear reactor environment, and even a high-temperature molten salt or liquid metal primary coolant, without substantially changing in physical properties, such as becoming substantially radioactive, melting, embrittlement, and/or retaining/adsorbing radioactive particulates.
  • a high-temperature molten salt or liquid metal primary coolant without substantially changing in physical properties, such as becoming substantially radioactive, melting, embrittlement, and/or retaining/adsorbing radioactive particulates.
  • several known structural materials including austenitic stainless steels 304 or 316 and martensitic stainless steels 9Cr-1Mo and 2.25Cr-1Mo for use with molten salts and metals, XM-19, zirconium alloys, nickel alloys, Alloy 600, etc. may be chosen for any element of components of example embodiment steam generators.
  • Joining structures and directly-touching elements may be chosen of different and compatible materials to prevent fouling.
  • FIG. 8 is a schematic of an example embodiment power plant having a secondary loop energy generation system 200 that uses an example embodiment steam generator 100 .
  • generator 100 may receive both liquid water and lower pressure steam from different sources and outlet steam to different turbines.
  • several different turbines may be used, including high pressure turbine 20 , intermediate pressure turbine 30 , and lower pressure turbine 40 , all connected in series with generator 50 or to individual generators.
  • Each turbine 20 , 30 , and 40 is configured with volume, speed, and turbine blade characteristics to best extract energy from steam in different pressure ranges.
  • Turbines 20 , 30 , and 40 may include steam outlets for steam exiting the turbine at lower pressures that are no longer useable for energy extraction, and these steam flows may supply the next lower-pressure turbine with steam.
  • high pressure turbine 20 may include an outlet for steam to flow into intermediate pressure turbine 30
  • intermediate turbine 30 may include an outlet for steam to flow into lower pressure turbine 40 .
  • Steam may at any point be cycled to a condenser and condensed to liquid water for water inlet 13 .
  • Example embodiment steam generator 100 in system 200 is connected to a primary coolant loop including reactor 1 , outlet 2 , and feed 3 which may be a primary liquid sodium loop in a faster reactor around 500° C.
  • Steam generator 100 is also connected to water inlet 13 and lower pressure steam inlet 113 to generate superheated, high-pressure, and/or higher-quality steam from these flows using the heat from the sodium.
  • three water inlets 13 from a condenser and one steam inlet 113 may flow into steam generator 100 , with three steam outlets 12 and one reheat outlet 112 exiting the same.
  • steam generator 100 includes outlets 12 and 112 going to different destinations—high pressure turbine 20 and intermediate pressure turbine 30 , respectively.
  • reheated steam from inlet 113 may be redirected to intermediate turbine 30 from steam generator 100 via outlet 112 .
  • Water from inlet 13 may be redirected to high pressure turbine 20 from steam generator 100 via outlet 12 .
  • example embodiment plant system 200 is seen to have higher efficiency than, for example, the plant of FIG. 1 .
  • fewer low pressure turbines 40 in favor of more intermediate pressure turbines 30 , may be required or used in system 200 , which may be advantageous given the lower efficiency and increased size of lower pressure turbines compared to high pressure turbine 20 and intermediate pressure turbine 30 .
  • generated or reheated steam from steam generator 100 may be higher quality and thus “dryer” than steam outlet from high pressure turbine 20 and intermediate pressure turbine 30 , providing a better working medium that will not degrade turbine blades as quickly.
  • valves in example embodiment system 200 may allow selective direction of steam for reheating in example embodiment steam generator 100 , condensation, or energy extraction in particular turbines.
  • a three-way valve 210 may allow steam coming from high-pressure turbine 20 to be directed to any of intermediate-pressure turbine 30 , inlet 113 to flow into steam generator 100 , or through a condenser to exit the system and/or potentially recycle back to water inlet 13 following condensation.
  • a master valve 231 on inlet 113 to steam generator 100 may prevent reheating of any steam through generator 231 should system 200 require less energy throughput.

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US15/857,532 2017-12-28 2017-12-28 Systems and methods for steam reheat in power plants Abandoned US20190203614A1 (en)

Priority Applications (7)

Application Number Priority Date Filing Date Title
US15/857,532 US20190203614A1 (en) 2017-12-28 2017-12-28 Systems and methods for steam reheat in power plants
JP2020536263A JP7213253B2 (ja) 2017-12-28 2018-09-11 発電プラントにおける蒸気再加熱のためのシステム及び方法
EP18895244.4A EP3732392A4 (en) 2017-12-28 2018-09-11 STEAM REHEATING SYSTEMS AND PROCESSES IN POWER GENERATION PLANTS
PCT/US2018/050318 WO2019133080A1 (en) 2017-12-28 2018-09-11 Systems and methods for steam reheat in power plants
CA3087040A CA3087040A1 (en) 2017-12-28 2018-09-11 Systems and methods for steam reheat in power plants
US16/914,418 US11525374B2 (en) 2017-12-28 2020-06-28 Systems and methods for steam reheat in power plants
US18/072,592 US11828204B2 (en) 2017-12-28 2022-11-30 Systems and methods for steam reheat in power plants

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