US3194020A - Method and apparatus relating to vapor generation - Google Patents

Method and apparatus relating to vapor generation Download PDF

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Publication number
US3194020A
US3194020A US267511A US26751163A US3194020A US 3194020 A US3194020 A US 3194020A US 267511 A US267511 A US 267511A US 26751163 A US26751163 A US 26751163A US 3194020 A US3194020 A US 3194020A
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United States
Prior art keywords
flow
turbine
vapor
steam
generator
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Expired - Lifetime
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US267511A
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English (en)
Inventor
Frederick J Hanzalek
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Combustion Engineering Inc
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Combustion Engineering Inc
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Publication date
Application filed by Combustion Engineering Inc filed Critical Combustion Engineering Inc
Priority to US267511A priority Critical patent/US3194020A/en
Priority to GB6691/64A priority patent/GB997549A/en
Priority to NL6401924A priority patent/NL6401924A/xx
Priority to FR965792A priority patent/FR1389148A/fr
Priority to ES0297166A priority patent/ES297166A1/es
Priority to BE644873A priority patent/BE644873A/xx
Priority to CH313264A priority patent/CH423814A/de
Application granted granted Critical
Publication of US3194020A publication Critical patent/US3194020A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F22—STEAM GENERATION
    • F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
    • F22B29/00—Steam boilers of forced-flow type
    • F22B29/02—Steam boilers of forced-flow type of forced-circulation 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
    • F01K3/00—Plants characterised by the use of steam or heat accumulators, or intermediate steam heaters, therein
    • F01K3/18—Plants characterised by the use of steam or heat accumulators, or intermediate steam heaters, therein having heaters
    • F01K3/20—Plants characterised by the use of steam or heat accumulators, or intermediate steam heaters, therein having heaters with heating by combustion gases of main boiler
    • F01K3/22—Controlling, e.g. starting, stopping
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F22—STEAM GENERATION
    • F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
    • F22B29/00—Steam boilers of forced-flow type
    • F22B29/06—Steam boilers of forced-flow type of once-through type, i.e. built-up from tubes receiving water at one end and delivering superheated steam at the other end of the tubes
    • F22B29/12—Steam boilers of forced-flow type of once-through type, i.e. built-up from tubes receiving water at one end and delivering superheated steam at the other end of the tubes operating with superimposed recirculation during starting and low-load periods, e.g. composite boilers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F22—STEAM GENERATION
    • F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
    • F22B35/00—Control systems for steam boilers
    • F22B35/06—Control systems for steam boilers for steam boilers of forced-flow type
    • F22B35/14—Control systems for steam boilers for steam boilers of forced-flow type during the starting-up periods, i.e. during the periods between the lighting of the furnaces and the attainment of the normal operating temperature of the steam boilers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F22—STEAM GENERATION
    • F22D—PREHEATING, OR ACCUMULATING PREHEATED, FEED-WATER FOR STEAM GENERATION; FEED-WATER SUPPLY FOR STEAM GENERATION; CONTROLLING WATER LEVEL FOR STEAM GENERATION; AUXILIARY DEVICES FOR PROMOTING WATER CIRCULATION WITHIN STEAM BOILERS
    • F22D11/00—Feed-water supply not provided for in other main groups
    • F22D11/02—Arrangements of feed-water pumps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F22—STEAM GENERATION
    • F22G—SUPERHEATING OF STEAM
    • F22G5/00—Controlling superheat temperature

Definitions

  • This invention relates generally to the art of vapor generation and has particular relation to an improved method and apparatus for high capacity generation of vapor such as employed in the utility field with the invention being particularly concerned with such vapor generators that have a so-called once-through flow circuit through which the once-through flow of the generator is forced by means of the feedwater pump.
  • the main feedwater pumps which are high speed, high capacity pumps that develop a very high pressure head, are often driven by steam turbines for reasons of plant economy and efficiency in the over-all plant cycle and because of this high throughflow required at startup, special electric motor driven startup pumps connected in parallel with the main turbine driven feedwater pumps are employed during the startup operation.
  • Auxiliary steam from a separate steam generator is often available for use with these units and is used for a variety of purposes such as turbine seals, de-aeration of feedwater during startup, soot blowing, air preheating and the like. It is, however, uneconomical to provide the very large quantity of auxiliary steam necessary to drive the main feedwater pump at startup with this large 30 percent flow requirement.
  • a modified once through-flow vapor generator that has a steam turbine driven main feedwater pump complex with this main feedwater pump being employed during startup as well as during normal operation of the unit.
  • Auxiliary steam is employed to drive the main feedwater pump during startup with the combination as thus employed, eliminating the necessity for the electric motor driven startup pumps heretofore utilized.
  • the modified once through-flow vapor generator is a once-through flow vapor generator which has a recirculation system superimposed upon its through-flow circuit or upon a portion of its through-flow circuit, which portion includes the region of the circuit of highest heat absorption (that portion associated with the furnace) and with this recirculation being effective to increase the flow of fluid through this portion of the through-flow circuit during startup and at least at loads below a predetermined load.
  • the modified once through-flow unit thus requires substantially less through-fiow during the startup operation than the conventional through-flow unit which is not equipped with the superimposed recirculation system.
  • a still further object of the invention is to provide an improved method and apparatus utilizing such a vapor generator and having improved economy and efiiciency during startup operation.
  • the invention comprises an arrangement, construction and combination of the elements of the inventive organization in such a manner as to attain the results desired as hereinafter more particularly set forth in the following detailed description of an illustrative embodiment, said embodiment being shown by the accompanying drawing wherein the single figure is a diagrammatic representation in the nature of a flow diagram of an improved power plant embodying the present invention.
  • the illustrative and preferred embodiment of the invention as depicted therein includes a modified once through-flow supercritical vapor generator that supplies vapor to a turbine arrangement which in conventional practice drives an electric generator.
  • the through-flow circuit of the vapor generator includes a number of heat exchange sections which are connected in series fiow relation with these sections being comprised of tubular members.
  • the through-flow passes through the feedwater valve 10 and enters the economizer 12. From the economizer the through-flow is conveyed through the furnace center wall 14 then through the outer furnace walls 15 and thereafter through the gas pass walls 18.
  • the through-flow is then conveyed through the series of fluid heaters 20 which may take the conventional form of tubular members disposed in panels in sinuously and internested relation and in the '7 combustion gas stream generated by the burning of fuel generator and with the burner being diagrammatically represented as 24.
  • the vapor whichleaves the finalfiuid heater 20 is;conveyed through. conduit 26 to the high pressure turbine 28 traversing the turbine valves.
  • conduit 4%) and condensate pump 42 to the demineralizer 44. 7 Then from this demineralizer the water is conveyed through the low pressure heaters 46 to the de-aerator 48.
  • Feedwater is conveyed from the de-aerator by and through the motor driven feedwater booster pump 50, the inter mediate pressure feedwater heaters 52', then throughthe main feed pump 54 and the high pressure feedwater heaters 56 for passage through the feedwater flow control valve and the through-flow circuit'of the vapor generator.
  • the electric motor driven booster pump 50 is conventionally employed in once-through flow vapor generators to alleviate the problem of the main teed pump pump sufficiently elevates the pressure .at 'the'inlet of the main feed pump so that this problem is alleviated, and the main pump operates in a satisfactory manner.
  • the booster pump is a relatively low-head pump.
  • the modified once'throughflow vapor generator has superimposed on its throughwith regar-dto net positive'suction head.
  • This booster I flow. circuit including the portion of the circuit which g has the highest rate of heatabsorption, a recirculating system with this recirculating system including the recirculating conduit '58 the inlet of which is connected to the through-flow circuit at'the outlet of the gas pass walls heat exchange section 18 and the outlet of which is connected with the mixing vessel fill wherein the hot recirculating fluid is mixed with the cooler fluid that is received in this vessel from the outlet of the economizen.
  • the recirculating pump 62 is in series flow with the through-flow circuit being connected at the outlet of the mixing vessel 60*.
  • This recirculating pump 62 does not have to operate against any substantial head but merely overcomes the friction head developed in thecircuit through which it forces the fluid.
  • Suitable valves 64 are provided upstream and downstream of this recirculating pump and a bypass 66 is provided around the, pump and valves and in which is disposed check valve 68.
  • a boiler throttle valve 74 Connected in the through-flow circuit intermediate the gas pass wall heat exchange'portion thereof and the first of the fluid heaters. 20, is a boiler throttle valve 74 and in bypass relation with this boiler throttle valve, is the boiler throttle bypass valve'72gThere is provided a system in bypass'relation with both of thcsevalves which is used to provide vapor flow through the fluid heaterslfl and to the turbine 28 during the initiation portion of the startup of the unit with this system including the conduit 1 I 4 76is connected with the hot well of the condenser by means of conduit 84- in which conduit is provided the valve 86.
  • the through-flow circuit is filled up to the BT and BTB valves 70 and 72 by means of the electric motor driven feedwater booster pump 50.
  • the recirculating pump 62 isactivated so that a recirculation of fluid through the furnace wall tubes and the gas pass walljtubes is provided.
  • the main feedwater pump, 54 is activated to provide a through-flow through the portion :of the through-flow circuit upstream 'of theboiler throttle valve' 70 and the boiler throttle 7 V the flash tank 76.
  • the valve 78 is set to provide a pre- From condenser 38 the condensate is conveyed through determinedrelatively high pressure in the through-flow system.
  • the burner or burners 24 are lit off and the initial heating of the fluid commenced. 7
  • Theboiler water feed pump 54 is driven by means of the turbine 88 and during the startup procedure, until sufficient steam for driving the turbine is generated by the, vapor generaton'this turbine 88 is provided with steam from auxiliary boiler 90.
  • auxiliary boiler is customarilyrprovided with these large high capacity 'units with this boiler generatingauxiliary steam for a large variety. of. purposes such as turbine sealing, de-
  • This auxiliary boiler as illustratively disclosed is fired by burner 92 and it produces steam at some desired pressure. As disclosed this boiler supplies steam for the turbine seals of the main turbine through conduit 94- and supplies steam through conduit 96 to the turbine 88 with valve 98 controlling the flow of this auxiliary steam to the turbine. Auxiliary steam is also supplied through conduit 1% to the tie-aerator with valve 102 controlling 'thisflow of auxiliary steam.
  • auxiliary boiler Since the auxiliary boiler is required to be of a capacity a to supply the many needs for which it is used in the system and since some of these needs are not concurrent with and;do not prevail at the time of starting up the costs in that separate electric motordriven startup pumps unit, this boiler has a capacity which may be used to supply a limited amount of steam to the turbine 88 that 'drives the main feedwater pump. Since with the -modified once through-flow unit the amount of through-flow necessary: at startup is relatively low, the auxiliary steam requirement to drive the turbine 88 duringstartup is such that the utilization of the main feedwater pump during the startup operation has been found to be economically feasible and resulting in a saving in operating and capital are not required.
  • the turbine v88 is supplied with auxiliarysteam from the auxiliary boiler 'flluntil suflicient steam has been produced'by the vapor generator for driving this turbine.
  • the temperature and pressure of. the steam leaving the vapor generator and zbeing conveyed through conduit 26 must at least be equal to the temperature and pressure of the vapor produced by the auxiliary boiler.
  • the operation of this turbine will be transferred from the auxiliary boiler and it will be supplied with vapor generated in the vapor generator.
  • conduit 104 is connected with conduit 26 with the flow through the conduit 104 being controlled by valve 106.
  • extraction steam i.e. steam taken from a predetermined extraction point of the high pressure turbine.
  • this extraction steam is conveyed through conduit 108 with valve 110 controlling the supply of this steam to turbine 88.
  • Extraction steam from a suitable extraction point is also conveyed through conduit 112 to the deaerator with valve 114 controlling the supply of this steam to the de-aerator.
  • the extraction steam may be supplemented by steam taken from the main steam supply to the turbine or in other words below approximately /3 load steam may be supplied to the drive turbine 88 for the main feedwater pump through extraction conduit 108 and the conduit 1G4 both in parallel.
  • turbine 88 may be of the condensing type for the purposes of the present invention it is shown of the non-condensing type with the steam exhausted from the turbine being conveyed to the de-aerator.
  • the illustrative feedwater supply system depicted in the drawing is diagrammatic in nature and that in an actual installation there may be more than one so-called string of feedwater heaters, and the main feedwater pump complex may consist of two pumps connected in parallel each with their own turbine drives and with the combined capacity of these pumps being such as to provide the necessary feedwater flow for full load operation.
  • a once-through flow vapor generator having a through-flow circuit that includes a plurality of heat exchange sections connected in series flow relation with a recirculating system superimposed on the through-flow system including the region thereof that has the highest rate of heat absorption, said recirculating system being operative during start up of the generator, said generator having a main feed pump, a turbine operative to drive said pump, and an auxiliary vapor generator operatively connected to supply vapor to said turbine during said startup of the said one-through flow vapor generator.
  • a circulating system superimposed on a predetermined portion of said circuit including the portion having the highest rate of heat absorption during startup and which system is operative to provide a circulation of the working medium through said circuit portion at least at and below a predetermined load, and a vapor turbine driven feed pump
  • the improved method utilized during startup of providing a predetermined through-flow via the main feed pump, supplying the motive fluid to the pump drive from a source separate from said vapor generator, said predetermined throughfiow being below minimum flow requirements for protection of said circuit portion of highest rate of heat absorption, supplementing the through-flow through said circuit portion by recirculation so that it is at least said minimum, raising the temperature and pressure of the throughflow and when vapor of at least the temperature and pressure of said separate source is produced transferring from said separate source for driving the turbine of the feed pump to the vapor produced in the vapor generator.
  • the method of generating steam comprising establishin g a flow of the working medium through a continuous path by means of a steam turbine driven main feedwater pump, imparting heat to said working fluid as it traverses said path converting the same to a vapor, establishing a recirculation of said working medium about a predetermined portion of said path including the portion of highest heat absorption, initiating the flow through said path by supplying steam from an auxiliary source to the turbine drive for said main feedwater pump with this initial flow being insufficient for tube protection at said region of highest heat absorption but with the recirculation making up for the insufiiciency of the through-flow for this purpose and transferring the delivery of steam to said turbine from said auxiliary source to steam produced in said continuous path when the pressure and temperature of this latter steam is such that it at least equals that of the auxiliary source.
  • a once-through flow vapor generator having a through-flow circuit that includes a plurality of heat exchange sections connected in series flow relation with a recirculating system superimposed on the through-flow system including the region thereof that has the highest rate of heat absorption, said generator having a vapor driven turbine main feed pump the turbine of which receives as its operating medium during normal operation of the vapor generator vapor that is produced in said generator, said unit having the characteristic that the startup through-flow requirements are substantially less than the flow requirements necessary forprotection of the portion of the through-flow circuit of highest heat absorption with the recirculating system assuring adequate protection of this portion of the circuit the method characterized by establishing the through-flow that is provided at startup of the unit by the vapor driven main feed pump and supplying the vapor for the turbine drive of said pump during startup from an auxiliary source.
  • a vapor generator of the once through-flow type that includes a plurality of heat exchange sections in series flow relation one of which sections comprises tubular members lining the walls of the furnace, a circulating system superimposed on a portion of the throughflow circuit including said furnace wall tubes, a valve in said circuit downstream of said portion but upstream of a number of the final heat exchange sections, a flash tank, valved conduit means connecting said flash tank to the through-flow circuit upstream of said valve, valved conduit means connecting the upper portion of the flash tank to said through-flow circuit downstream of said valve, a water discharge connected with the lower region of said tank, a vapor turbine driven main feedwater pump for forcing the through-flow through said circuit, an auxiliary boiler operatively connected with the turbine for driving said pump during startup of the vapor generator and means for supplying to said turbine vapor produced in the vapor generator.
  • a once-through fiow vapor generator having a A through flow circuit including a plurality of heat excirculation of fluid through a portion of the throughflow circuit including the region of highest heat absorption, establishing a through-flow by means of the main feedwater pump and of such a magnitude that perv se it doesnot provide'the necessary velocity for :protection of the furnace tubes but together with the recirculation sutficient'velocity 'for this purpose is had, driving said feedwater pump by means of a vapor turbine and supplying the motive fluid for said vapor turbine during startup of the vapor generator from an auxiliaryboiler and transferring the supply of such boiler fluid to vapor generated by the vapor generator-after the startup op eration has progressed sufficiently so that. the generator is producing adequate vapor for this purpose.
  • a once-through fiow'v'apor generator comprising in combinationathrough-flow circuit including a p111: rality of heat exchange sections connected in series flow relation, a turbine driven mainfcedwater pump operative to force.
  • the through-flow through said circuit one of said heat exchange sections of said circuit including furnace wall tubes, a recirculation system superimposed ona portion of said circuit including said furnace wall tubes and operative to provide for a recirculation of fluid through said portion, a main turbine connected to receive steam from said vapor, generator, an auxiliary boiler operatively connected to supply-vapor to the turbine drive for the main feed'pump during startup, means connected with an intermediate pointof said main turbine for supplying vapor to said turbine drive and means connected intermediate the vapor generator and the main turbine for supplying vapor to said turbinedrive and valve means operative to; control the supply of steam.
  • a once-through flow steam generator including a and at startup in order to protect these portions-fromoverheating, a main feed pump, a turbine drive for said termined' load is reached.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Water Supply & Treatment (AREA)
  • Engine Equipment That Uses Special Cycles (AREA)
  • Control Of Steam Boilers And Waste-Gas Boilers (AREA)
US267511A 1963-03-25 1963-03-25 Method and apparatus relating to vapor generation Expired - Lifetime US3194020A (en)

Priority Applications (7)

Application Number Priority Date Filing Date Title
US267511A US3194020A (en) 1963-03-25 1963-03-25 Method and apparatus relating to vapor generation
GB6691/64A GB997549A (en) 1963-03-25 1964-02-18 Combined circulation steam generator and method of initiating its operation
NL6401924A NL6401924A (en)van) 1963-03-25 1964-02-27
FR965792A FR1389148A (fr) 1963-03-25 1964-03-02 Perfectionnements apportés aux générateurs de vapeur à circulation combinée
ES0297166A ES297166A1 (es) 1963-03-25 1964-03-03 Un generador de vapor tubular
BE644873A BE644873A (en)van) 1963-03-25 1964-03-06
CH313264A CH423814A (de) 1963-03-25 1964-03-11 Verfahren zum Anlassen eines Dampferzeugers mit Zwanglauf

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US267511A US3194020A (en) 1963-03-25 1963-03-25 Method and apparatus relating to vapor generation

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US3194020A true US3194020A (en) 1965-07-13

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BE (1) BE644873A (en)van)
CH (1) CH423814A (en)van)
ES (1) ES297166A1 (en)van)
GB (1) GB997549A (en)van)
NL (1) NL6401924A (en)van)

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3338053A (en) * 1963-05-20 1967-08-29 Foster Wheeler Corp Once-through vapor generator start-up system
US3431168A (en) * 1967-06-26 1969-03-04 Gen Electric Reactor cooling system
US3523421A (en) * 1968-07-24 1970-08-11 Combustion Eng Peaking load steam cycle
US3705494A (en) * 1971-01-04 1972-12-12 Fester Wheeler Corp Holding system for steam power cycle
US3777486A (en) * 1971-01-29 1973-12-11 Carrier Corp Apparatus for and a method of operating power recovery equipment
US3894391A (en) * 1972-08-22 1975-07-15 Siemens Ag Feedwater purification system for a steam power plant with boiling-water reactor
JPS5138204A (ja) * 1974-09-30 1976-03-30 Kawasaki Heavy Ind Ltd Korogasuenerugiikaishupurantono seigyohoho
CN103017133A (zh) * 2012-12-30 2013-04-03 哈尔滨锅炉厂有限责任公司 带循环泵的直流锅炉启动系统及其启动方法
CN104131846A (zh) * 2014-07-14 2014-11-05 国家电网公司 应用于300mw汽轮机组汽动给水泵的汽源自动切换装置及方法
CN107795340A (zh) * 2016-09-07 2018-03-13 通用电气公司 涡轮机温度控制系统

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4533731A (en) * 1982-03-17 1985-08-06 Asahi Kasei Kogyo Kabushiki Kaisha Aminoindazole derivatives
TW212826B (en)van) * 1991-11-28 1993-09-11 Sulzer Ag
WO1998015778A1 (en) * 1996-10-08 1998-04-16 Siemens Aktiengesellschaft Condensate and feedwater course of a steam power plant and steam power plant having the condensate and feedwater course

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US1064855A (en) * 1911-01-12 1913-06-17 Richard William Parry Feed-water heating and purifying means.
DE386047C (de) * 1923-12-01 Siemens & Halske Akt Ges Verfahren zur Herstellung von Kontaktfeldern mit vielfachgeschalteten Kontakten
US1791923A (en) * 1928-06-16 1931-02-10 Siemens Ag Multiway sludge valve
US1892093A (en) * 1932-12-27 Method of removing rust
US2556128A (en) * 1945-08-17 1951-06-05 Thomas L B Webb Method for removing scale
GB768201A (en) * 1955-03-24 1957-02-13 Babcox & Wilcox Ltd Improvements relating to forced flow once through tubulous vapour generating and superheating units and to the starting of turbines arranged to be supplied with vapour from such units
US2858808A (en) * 1954-04-08 1958-11-04 Babcock & Wilcox Co Method of operating a supercritical pressure vapor generator
US2907305A (en) * 1953-10-27 1959-10-06 Sulzer Ag Method of generating steam in a forced flow steam generator
CA617110A (en) * 1961-03-28 Lieberherr Arthur Method for draining the tube system of a steam generator
US2989038A (en) * 1956-04-26 1961-06-20 Duerrwerke Ag Device for starting-up once-through boilers
US3009325A (en) * 1955-05-27 1961-11-21 Babcock & Wilcox Co Once-through vapor generating and superheating unit
US3010853A (en) * 1959-05-14 1961-11-28 Solvent Service Inc Method of cleaning pipes and the like
US3019774A (en) * 1959-09-16 1962-02-06 Dunwerke Ag Once-through vapor generator
US3038453A (en) * 1957-02-07 1962-06-12 Combustion Eng Apparatus and method for controlling a forced flow once-through steam generator
US3085915A (en) * 1958-03-13 1963-04-16 Siemens Ag Method of removing rust from ironcontaining materials, particularly for the cleaning of boiler plants
US3159145A (en) * 1963-02-26 1964-12-01 Gilbert Associates Steam generator by-pass systems for a steam-electric generating plant
US3162179A (en) * 1962-12-05 1964-12-22 Gilbert Associates Fluid circulation system for a oncethrough type steam generator

Patent Citations (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA617110A (en) * 1961-03-28 Lieberherr Arthur Method for draining the tube system of a steam generator
DE386047C (de) * 1923-12-01 Siemens & Halske Akt Ges Verfahren zur Herstellung von Kontaktfeldern mit vielfachgeschalteten Kontakten
US1892093A (en) * 1932-12-27 Method of removing rust
US1064855A (en) * 1911-01-12 1913-06-17 Richard William Parry Feed-water heating and purifying means.
US1791923A (en) * 1928-06-16 1931-02-10 Siemens Ag Multiway sludge valve
US2556128A (en) * 1945-08-17 1951-06-05 Thomas L B Webb Method for removing scale
US2907305A (en) * 1953-10-27 1959-10-06 Sulzer Ag Method of generating steam in a forced flow steam generator
US2858808A (en) * 1954-04-08 1958-11-04 Babcock & Wilcox Co Method of operating a supercritical pressure vapor generator
GB768201A (en) * 1955-03-24 1957-02-13 Babcox & Wilcox Ltd Improvements relating to forced flow once through tubulous vapour generating and superheating units and to the starting of turbines arranged to be supplied with vapour from such units
US3009325A (en) * 1955-05-27 1961-11-21 Babcock & Wilcox Co Once-through vapor generating and superheating unit
US2989038A (en) * 1956-04-26 1961-06-20 Duerrwerke Ag Device for starting-up once-through boilers
US3038453A (en) * 1957-02-07 1962-06-12 Combustion Eng Apparatus and method for controlling a forced flow once-through steam generator
US3085915A (en) * 1958-03-13 1963-04-16 Siemens Ag Method of removing rust from ironcontaining materials, particularly for the cleaning of boiler plants
US3010853A (en) * 1959-05-14 1961-11-28 Solvent Service Inc Method of cleaning pipes and the like
US3019774A (en) * 1959-09-16 1962-02-06 Dunwerke Ag Once-through vapor generator
US3162179A (en) * 1962-12-05 1964-12-22 Gilbert Associates Fluid circulation system for a oncethrough type steam generator
US3159145A (en) * 1963-02-26 1964-12-01 Gilbert Associates Steam generator by-pass systems for a steam-electric generating plant

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3338053A (en) * 1963-05-20 1967-08-29 Foster Wheeler Corp Once-through vapor generator start-up system
US3431168A (en) * 1967-06-26 1969-03-04 Gen Electric Reactor cooling system
US3523421A (en) * 1968-07-24 1970-08-11 Combustion Eng Peaking load steam cycle
US3705494A (en) * 1971-01-04 1972-12-12 Fester Wheeler Corp Holding system for steam power cycle
US3777486A (en) * 1971-01-29 1973-12-11 Carrier Corp Apparatus for and a method of operating power recovery equipment
US3894391A (en) * 1972-08-22 1975-07-15 Siemens Ag Feedwater purification system for a steam power plant with boiling-water reactor
JPS5138204A (ja) * 1974-09-30 1976-03-30 Kawasaki Heavy Ind Ltd Korogasuenerugiikaishupurantono seigyohoho
CN103017133A (zh) * 2012-12-30 2013-04-03 哈尔滨锅炉厂有限责任公司 带循环泵的直流锅炉启动系统及其启动方法
CN104131846A (zh) * 2014-07-14 2014-11-05 国家电网公司 应用于300mw汽轮机组汽动给水泵的汽源自动切换装置及方法
CN107795340A (zh) * 2016-09-07 2018-03-13 通用电气公司 涡轮机温度控制系统

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GB997549A (en) 1965-07-07
ES297166A1 (es) 1964-08-16

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