ES297958A1 - Economic combination and operation of boiler throttle valves - Google Patents

Economic combination and operation of boiler throttle valves

Info

Publication number
ES297958A1
ES297958A1 ES0297958A ES297958A ES297958A1 ES 297958 A1 ES297958 A1 ES 297958A1 ES 0297958 A ES0297958 A ES 0297958A ES 297958 A ES297958 A ES 297958A ES 297958 A1 ES297958 A1 ES 297958A1
Authority
ES
Spain
Prior art keywords
pressure
valve
valves
flow
superheater
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
ES0297958A
Other languages
Spanish (es)
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Combustion Engineering Inc
Original Assignee
Combustion Engineering Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Combustion Engineering Inc filed Critical Combustion Engineering Inc
Publication of ES297958A1 publication Critical patent/ES297958A1/en
Expired legal-status Critical Current

Links

Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F22STEAM GENERATION
    • F22BMETHODS OF STEAM GENERATION; STEAM BOILERS
    • F22B35/00Control systems for steam boilers
    • F22B35/06Control systems for steam boilers for steam boilers of forced-flow type
    • F22B35/14Control 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
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01KSTEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
    • F01K3/00Plants characterised by the use of steam or heat accumulators, or intermediate steam heaters, therein
    • F01K3/18Plants characterised by the use of steam or heat accumulators, or intermediate steam heaters, therein having heaters
    • F01K3/20Plants characterised by the use of steam or heat accumulators, or intermediate steam heaters, therein having heaters with heating by combustion gases of main boiler
    • F01K3/22Controlling, e.g. starting, stopping
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F22STEAM GENERATION
    • F22BMETHODS OF STEAM GENERATION; STEAM BOILERS
    • F22B29/00Steam boilers of forced-flow type
    • F22B29/06Steam 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

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Control Of Steam Boilers And Waste-Gas Boilers (AREA)
  • Control Of Turbines (AREA)
  • Engine Equipment That Uses Special Cycles (AREA)

Abstract

A method of starting a forced flow once through vapour generator, having vapour generating and superheating sections connected by valve means in parallel, the first valve means constructed for operation with critical pressure drop, the second of substantially larger flow area unsuited for such operation, circulation means forcing flow through the sections in series, and an adjustable restriction controlling flow from the superheater section to a load having a minimum initial flow requirement, comprises forcing substantially the same through flow of liquid through the sections and restriction while maintaining a preselected pressure in the generating section, establishing said minimum initial flow with the restriction adjusted to provide a superheater pressure substantially less than that producing a critical pressure drop across the valve means, opening first valve means to raise the superheater pressure to a higher pressure to eliminate the critical pressure drop, then opening second valve means while maintaining the generating section at said preselected pressure, to vary superheater pressure between said higher pressure and generating section pressure. In the super-critical steam generator shown, feedwater is forced by pumps 10, 12, Fig. 1 (not shown), through feedwater valves FW, FWB in parallel to economizer 16, generating section comprising centre and outer furnace walls 26 and steam cooled walls of the rear gas pass 28, a system of pressure actuated boiler throttle valves BT, BTB and superheaters 30, 32 from which steam passes through turbine control valves 36 to turbine sections 38, 42, 46 between which are reheaters 40, 44 and finally to a condenser 48. Condensate passes through a demineralizer 50, de-aerator 54 and feedwater heaters 52, 55, 56. Feedwater fed by pumps 10, 12 is recirculated through the generating section and conduit 64, connected to a mixing vessel 60, by pump 18. A flash tank or separator 60 is connected in parallel across the throttle valves by conduits 58, 62 containing valves BE, SA, respectively. The method of starting comprises closing valves BT, BTB, setting valve BE to automatic pressure control at a preselected pressure and with the feed pumps and valve FWB establishing a minimum flow through the generator section which returns to the condenser through a water drain valve WD. Recirculating pump 18 is started, the generator is fired and as the temperature rises fluid flashes to steam in the separator 60 part of which passes through valve SA to the superheater section returning to the condenser via valve SD. The control of valve BE is reset at a pressure higher than the highest saturation pressure of the fluid in the walls. If boiler water clean up is required the fluid temperature and recirculation flow are maintained constant until the solids concentration reaches acceptable limits, during this time L.P. steam may be used to heat and roll the turbine. When clean up is completed the firing rate is increased, producing in the separator increasing steam flow which is used to speed the turbine and establish a desired turbine chest pressure, excess steam returning to the condenser through valves SP. Valve BTB is gradually opened and valves BE, SP, SA closed, maintaining a preselected pressure in the furnace walls, and when the superheater pressure reaches a value above that producing a critical throttling pressure drop valve BT is opened. Valve BT is controlled by pressures in the furnace walls and in the superheater as indicated at 83, 85 and valves BT, BTB are prevented from opening below a preselected temperature in the furnace walls by a temperature actuated switch or valve 67. A hot restart is carried out by closing the BT, BTB valves, reducing the superheater pressure to the separator operating level and then following the normal starting sequence.
ES0297958A 1963-03-25 1964-03-24 Economic combination and operation of boiler throttle valves Expired ES297958A1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US267512A US3262431A (en) 1963-03-25 1963-03-25 Economic combination and operation of boiler throttle valves

Publications (1)

Publication Number Publication Date
ES297958A1 true ES297958A1 (en) 1964-12-01

Family

ID=23019096

Family Applications (2)

Application Number Title Priority Date Filing Date
ES0297958A Expired ES297958A1 (en) 1963-03-25 1964-03-24 Economic combination and operation of boiler throttle valves
ES0302109A Expired ES302109A1 (en) 1963-03-25 1964-07-15 A steam generator system (Machine-translation by Google Translate, not legally binding)

Family Applications After (1)

Application Number Title Priority Date Filing Date
ES0302109A Expired ES302109A1 (en) 1963-03-25 1964-07-15 A steam generator system (Machine-translation by Google Translate, not legally binding)

Country Status (7)

Country Link
US (1) US3262431A (en)
BE (1) BE645707A (en)
CH (1) CH457505A (en)
DE (1) DE1426684A1 (en)
ES (2) ES297958A1 (en)
GB (1) GB1052417A (en)
NL (2) NL6402810A (en)

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3411300A (en) * 1967-05-31 1968-11-19 Combustion Eng Method and apparatus for sliding pressure operation of a vapor generator at subcritical and supercritical pressure
US3972193A (en) * 1975-01-02 1976-08-03 Foster Wheeler Energy Corporation Integral separator start-up system for a vapor generator with constant pressure furnace circuitry
US4019467A (en) * 1976-04-20 1977-04-26 Westinghouse Electric Corporation Valve sequencing startup control system for once-through boiler
US4241585A (en) * 1978-04-14 1980-12-30 Foster Wheeler Energy Corporation Method of operating a vapor generating system having integral separators and a constant pressure furnace circuitry
US4338789A (en) * 1980-02-01 1982-07-13 Dolan John E Method of varying turbine output of a supercritical-pressure steam generator-turbine installation
GB2128257B (en) * 1982-04-19 1985-08-29 John Edward Dolan Method of varying turbine output of a supercritical-pressure steam generator-turbine installation
US5390631A (en) * 1994-05-25 1995-02-21 The Babcock & Wilcox Company Use of single-lead and multi-lead ribbed tubing for sliding pressure once-through boilers
CN102192819B (en) * 2010-03-11 2013-03-20 中国核动力研究设计院 Quick heating process for pre-service hydrostatic test of secondary side of steam generator
DE102010028720A1 (en) * 2010-05-07 2011-11-10 Siemens Aktiengesellschaft Method for operating a steam generator
JP6791801B2 (en) * 2017-04-10 2020-11-25 三菱パワー株式会社 Control method of gas turbine combined cycle plant and gas turbine combined cycle plant

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL224694A (en) * 1957-02-07

Also Published As

Publication number Publication date
NL133605C (en)
CH457505A (en) 1968-06-15
NL6402810A (en) 1964-09-28
DE1426684A1 (en) 1970-02-12
GB1052417A (en)
BE645707A (en) 1964-09-25
ES302109A1 (en) 1965-12-01
US3262431A (en) 1966-07-26

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