GB1387716A - Method and apparatus for controlling a steam generator - Google Patents

Method and apparatus for controlling a steam generator

Info

Publication number
GB1387716A
GB1387716A GB1650672A GB1650672A GB1387716A GB 1387716 A GB1387716 A GB 1387716A GB 1650672 A GB1650672 A GB 1650672A GB 1650672 A GB1650672 A GB 1650672A GB 1387716 A GB1387716 A GB 1387716A
Authority
GB
United Kingdom
Prior art keywords
valve
feedwater
deviation
desired value
xwi
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
GB1650672A
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.)
Siemens AG
Original Assignee
Siemens AG
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 Siemens AG filed Critical Siemens AG
Publication of GB1387716A publication Critical patent/GB1387716A/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
    • F22B35/10Control systems for steam boilers for steam boilers of forced-flow type of once-through type

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Control Of Steam Boilers And Waste-Gas Boilers (AREA)
  • Feedback Control In General (AREA)

Abstract

1387716 Once-through boilers SIEMENS AG 10 April 1972 [14 April 1971] 16506/72 Heading F4A [Also in Division G3] In the control of a once through steam generator 1 (Fig. 1), e.g. to supply a turbogenerator, the specific enthalpy i 1 of slightly superheated steam is maintained at a desired value by adjustment of feed water throughflow rate and/or heating fuel supply in dependence upon a control signal Xw 1 significant of the deviation of the specific enthalpy from the desired value. The control signal Xwi is derived by a computer 21 (Figs. 1, 2), which computes the equation Xwi = Kp.Xwp + Kt.Xwt where Xwp is the deviation of actual pressure P1 in boiler 1 sensed by a sensor 19, from a desired value P 0 ; Xwt is the deviation in actual temperature Ti sensed by a sensor 17, from a desired value T 0 ; Kp + Kt are predetermined values which may be considered constants for small variations about a fixed working point A (desired condition P 0 T 0 ). If however, Xwi is to be determined for a relatively large working range, then KpKt cannot be considered as constants and may for example be varied as a function of load, such as the desired electric power output of a turbogenerator connected to the steam generator. In the Benson boiler 1 (Fig. 1), fuel is fed in at 2 for vaporizing feedwater in-flow 3, controlled by water valve 4. Some water is diverted at 6 to an injection cooler 13 via a valve 14. The feedwater through-flow rate is metered at 8, and the water passes through a preheater 10 and vaporizer 11. Steam leaving 11 is slightly superheated and the temperature and pressure are sensed by the sensors 17, 19 respectively. The steam passes to a superheater 12 and via the injection cooler 13 to superheater 15 and thence to a turbo-generator (not illustrated). Feedwater through flow rate is normally maintained constant by a feedback loop from the flow meter 8 to a comparator or summator 24 where it is compared with a desired value thereof. Any difference value is fed to a controller 25 of an actuator 5 which operates the valve 4. However, in the event of a breakdown in the heating, e.g. a momentary change in calorific value of fuel the resulting enthalpy deviation control signal Xwi fed to summator 24 causes the valve 4 to operate in a sense to maintain the specific enthalpy constant. Other computation circuits 21 are disclosed, with reference to Figs. 3 to 7, for specific operating conditions. For example, the desired specific enthalpy may be intentionally varied by superordinated controllers. Likewise, desired values P 0 and T 0 may be controlled in a load dependent manner, Fig. 8 (not shown), illustrates substantially a combination of Fig. 1, and the computation circuits of Fig. 7, and proportional integral control of the feedwater valve 4 is effected.
GB1650672A 1971-04-14 1972-04-10 Method and apparatus for controlling a steam generator Expired GB1387716A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE2118028A DE2118028A1 (en) 1971-04-14 1971-04-14 PROCEDURE AND ARRANGEMENT FOR CONTROL ON A HEAT EXCHANGER

Publications (1)

Publication Number Publication Date
GB1387716A true GB1387716A (en) 1975-03-19

Family

ID=5804659

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1650672A Expired GB1387716A (en) 1971-04-14 1972-04-10 Method and apparatus for controlling a steam generator

Country Status (11)

Country Link
US (1) US3774396A (en)
AT (1) AT317929B (en)
BE (1) BE782175A (en)
CA (1) CA959562A (en)
DE (1) DE2118028A1 (en)
FI (1) FI52398C (en)
FR (1) FR2133672B1 (en)
GB (1) GB1387716A (en)
IT (1) IT957176B (en)
SE (1) SE7204787L (en)
ZA (1) ZA722332B (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2166200A (en) * 1984-10-25 1986-04-30 Westinghouse Electric Corp Control system for the supply of steam to a steam turbine
GB2276225A (en) * 1993-03-12 1994-09-21 Westinghouse Electric Corp Temperature control of boiler steam

Families Citing this family (22)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3877636A (en) * 1973-01-16 1975-04-15 Hitachi Ltd Automatic starting device for plant
US4005581A (en) * 1975-01-24 1977-02-01 Westinghouse Electric Corporation Method and apparatus for controlling a steam turbine
CH599504A5 (en) * 1975-09-26 1978-05-31 Sulzer Ag
JPS5814404U (en) * 1981-07-22 1983-01-29 株式会社東芝 rankine cycle device
US4471620A (en) * 1981-11-13 1984-09-18 Westinghouse Electric Corp. Turbine low pressure bypass spray valve control system and method
DE3243578C3 (en) * 1982-11-25 1998-10-22 Babcock Energie Umwelt Method for operating a once-through steam generator
DE3303548C3 (en) * 1983-02-03 1995-05-18 Babcock Energie Umwelt Method for operating a once-through steam generator
US4451003A (en) * 1983-06-09 1984-05-29 Exxon Research And Engineering Co. Control scheme and apparatus for a cogeneration boiler
US4489679A (en) * 1983-12-12 1984-12-25 Combustion Engineering, Inc. Control system for economic operation of a steam generator
US4557686A (en) * 1984-07-16 1985-12-10 Phillips Petroleum Company Control of the flow of fuel to multiple burners
US4574746A (en) * 1984-11-14 1986-03-11 The Babcock & Wilcox Company Process heater control
US4776301A (en) * 1987-03-12 1988-10-11 The Babcock & Wilcox Company Advanced steam temperature control
WO1993022599A1 (en) * 1992-05-04 1993-11-11 Siemens Aktiengesellschaft Forced-flow steam generator
JP3017623B2 (en) * 1993-09-28 2000-03-13 株式会社日立製作所 Coal gasifier
WO2000031469A1 (en) * 1998-11-25 2000-06-02 Masnoi, Sergei Sergeevich Method for the exploitation of a steam turbine installation
US7504260B1 (en) * 2000-05-16 2009-03-17 Lang Fred D Method and apparatus for controlling gas temperatures associated with pollution reduction processes
EP1614962A1 (en) * 2004-07-09 2006-01-11 Siemens Aktiengesellschaft Method for operating of an once-through steam generator
EP2065641A3 (en) * 2007-11-28 2010-06-09 Siemens Aktiengesellschaft Method for operating a continuous flow steam generator and once-through steam generator
EP2194320A1 (en) * 2008-06-12 2010-06-09 Siemens Aktiengesellschaft Method for operating a once-through steam generator and once-through steam generator
DE102010040210A1 (en) * 2010-09-03 2012-03-08 Siemens Aktiengesellschaft Method for operating a solar-heated continuous steam generator and solar thermal continuous steam generator
DE102011004269A1 (en) * 2011-02-17 2012-08-23 Siemens Aktiengesellschaft Method for operating a solar thermal parabolic trough power plant
DE102016102777A1 (en) * 2016-02-17 2017-08-17 Netzsch Trockenmahltechnik Gmbh Method and apparatus for generating superheated steam from a working fluid

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2853058A (en) * 1951-06-26 1958-09-23 Yuba Cons Ind Inc Steam plant and controller
US3284615A (en) * 1956-09-24 1966-11-08 Burroughs Corp Digital control process and system
US3244898A (en) * 1959-12-29 1966-04-05 Combustion Eng Power plant system and control therefor
NL268011A (en) * 1960-08-08
CH397884A (en) * 1962-09-10 1965-08-31 Sulzer Ag Process for regulating a nuclear reactor plant and nuclear reactor plant for carrying out the process
US3338054A (en) * 1964-12-29 1967-08-29 Combustion Eng Method and apparatus for increasing control response of a vapor generator

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2166200A (en) * 1984-10-25 1986-04-30 Westinghouse Electric Corp Control system for the supply of steam to a steam turbine
GB2166200B (en) * 1984-10-25 1989-05-24 Westinghouse Electric Corp Adaptive temperature control system for the supply of steam to a steam turbine
GB2276225A (en) * 1993-03-12 1994-09-21 Westinghouse Electric Corp Temperature control of boiler steam

Also Published As

Publication number Publication date
FR2133672A1 (en) 1972-12-01
US3774396A (en) 1973-11-27
FR2133672B1 (en) 1981-04-10
IT957176B (en) 1973-10-10
FI52398C (en) 1977-08-10
BE782175A (en) 1972-10-16
FI52398B (en) 1977-05-02
ZA722332B (en) 1972-12-27
AT317929B (en) 1974-09-25
SE7204787L (en) 1972-10-16
CA959562A (en) 1974-12-17
DE2118028A1 (en) 1973-03-15

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Legal Events

Date Code Title Description
PS Patent sealed [section 19, patents act 1949]
PCNP Patent ceased through non-payment of renewal fee