JPS6475814A - Control system for pressure in furnace - Google Patents

Control system for pressure in furnace

Info

Publication number
JPS6475814A
JPS6475814A JP62233398A JP23339887A JPS6475814A JP S6475814 A JPS6475814 A JP S6475814A JP 62233398 A JP62233398 A JP 62233398A JP 23339887 A JP23339887 A JP 23339887A JP S6475814 A JPS6475814 A JP S6475814A
Authority
JP
Japan
Prior art keywords
signal
control signal
furnace
value
pressure
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.)
Granted
Application number
JP62233398A
Other languages
Japanese (ja)
Other versions
JPH0781700B2 (en
Inventor
Moriharu Yasukado
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.)
Hitachi Engineering Co Ltd
Hitachi Ltd
Original Assignee
Hitachi Engineering Co Ltd
Hitachi Ltd
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 Hitachi Engineering Co Ltd, Hitachi Ltd filed Critical Hitachi Engineering Co Ltd
Priority to JP62233398A priority Critical patent/JPH0781700B2/en
Publication of JPS6475814A publication Critical patent/JPS6475814A/en
Publication of JPH0781700B2 publication Critical patent/JPH0781700B2/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N1/00—Regulating fuel supply
    • F23N1/02—Regulating fuel supply conjointly with air supply
    • F23N1/022—Regulating fuel supply conjointly with air supply using electronic means
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N2225/00—Measuring
    • F23N2225/04—Measuring pressure
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N2233/00—Ventilators
    • F23N2233/06—Ventilators at the air intake
    • F23N2233/08—Ventilators at the air intake with variable speed

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Regulation And Control Of Combustion (AREA)
  • Control Of Steam Boilers And Waste-Gas Boilers (AREA)

Abstract

PURPOSE:To prevent reduction of pressure in a furnace and to enable control of early restoration, by a method wherein an addition value signal in which a proportional integration value of a value by a pressure in a furnace is added to a forced draft fan moving vane control signal is switched to a main fuel trip control signal during the occurrence of a main fuel trip, and is switched to an internal pressure abnormal reduction control signal during abnormal reduction of an internal pressure. CONSTITUTION:When pressure in a furnace is sharply reduced to a value lower than that set by a furnace internal pressure setter SG51 for override, it is compared with an output from an SG53 at a set value 0% by means of a low value selector 52 to output a proportional control signal 73, by which a deviation signal is selected, to an AD 55. The signal is added togetherwith a PI control signal 71 and a signal 72, rendered effective only during MFT, the result is compared with a PI control signal 71 by means of an LS 56, and a value, being on the lower side, i.e. an override control signal 74, is selected. By closing an IDF moving vane 10 through an ASW 58, restoration of reduction of a pressure in a furnace is controlled. During the occurrence of MFT, on MFT generating signal 67 is immediately triggered, an ASW 44 is switched to the side (a), and the signal 72 is rendered effective from 0% of an SG45.
JP62233398A 1987-09-17 1987-09-17 Furnace pressure control method Expired - Lifetime JPH0781700B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP62233398A JPH0781700B2 (en) 1987-09-17 1987-09-17 Furnace pressure control method

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP62233398A JPH0781700B2 (en) 1987-09-17 1987-09-17 Furnace pressure control method

Publications (2)

Publication Number Publication Date
JPS6475814A true JPS6475814A (en) 1989-03-22
JPH0781700B2 JPH0781700B2 (en) 1995-09-06

Family

ID=16954455

Family Applications (1)

Application Number Title Priority Date Filing Date
JP62233398A Expired - Lifetime JPH0781700B2 (en) 1987-09-17 1987-09-17 Furnace pressure control method

Country Status (1)

Country Link
JP (1) JPH0781700B2 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103499958A (en) * 2013-09-30 2014-01-08 中国神华能源股份有限公司 Method and device for controlling MFT (Main Fuel Trip)
CN107238102A (en) * 2017-05-31 2017-10-10 上海明华电力技术工程有限公司 A kind of primary air fan RB control methods under full load mode

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57153103A (en) * 1981-03-18 1982-09-21 Hitachi Ltd Fuel control system for coal firing through-flow plant
JPS601529A (en) * 1983-06-17 1985-01-07 Hitachi Ltd Surface-temperature measuring method

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57153103A (en) * 1981-03-18 1982-09-21 Hitachi Ltd Fuel control system for coal firing through-flow plant
JPS601529A (en) * 1983-06-17 1985-01-07 Hitachi Ltd Surface-temperature measuring method

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103499958A (en) * 2013-09-30 2014-01-08 中国神华能源股份有限公司 Method and device for controlling MFT (Main Fuel Trip)
CN107238102A (en) * 2017-05-31 2017-10-10 上海明华电力技术工程有限公司 A kind of primary air fan RB control methods under full load mode
CN107238102B (en) * 2017-05-31 2019-01-29 上海明华电力技术工程有限公司 A kind of primary air fan RB control method under full load mode

Also Published As

Publication number Publication date
JPH0781700B2 (en) 1995-09-06

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