An electronic/pneumatic system designed for single or two boiler installations governs the fuel and air supply to the boiler to meeet the instantaneous steam demand, at the same time maintaining the correct fuel/air ratio for optimum combustion efficiency. The central electronic controller employs integrated circuits. Operation of the control valves and dampers is performed pneumatically. Under steady steaming conditions the steam pressure will be maintained at the preset value within plus or minus 1 psi and the excess oxygen within 0.5%, quite independent of the steam demand, i.e. the control characteristic is proportional and integrating. Special arrangements where two fuels are burned (oil and gas) can also be provided, as well as feed water level control. The system can be connected to the main turbine controls in order to provide an anticipatory response. The controller can initiate burner shutdown sequences where the range is beyond the normal turndown and will supervise operation of the steam dump valve. Diagrams show the connectors between the sensors, instrument panel, and actuators.

  • Corporate Authors:

    Whitehall Technical Press Limited

    Wrotham Place
    Wrotham, Sevenoaks, Kent ME14 1PE,   England 
  • Publication Date: 0

Media Info

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Filing Info

  • Accession Number: 00015015
  • Record Type: Publication
  • Source Agency: Engineering Index
  • Files: TRIS
  • Created Date: May 13 1971 12:00AM