FLUIDISED BED COMBUSTION FOR ADVANCED STEAM PLANTS

Babcock & Wilcox have entered into a collaboration agreement with STAL-LAVEL Turbin AB to develop advanced steam propulsion plant in which fluidised bed combustion techniques are utilized. Over recent years there has been a growing interest in fluidised bed combustion sharpened by the fuel crisis and the environmental protection lobby. Widespread research has been led in the U.K. by a consortium of British Petroleum, the National Coal Board, and the National Research and Development Council operating as Combustion Systems Ltd (CSL) who formed a new company with Babcock & Wilcox called Babcock Combustion Sytems Ltd (BCSL). The fluidised bed combustor in its simplest form consists merely; of a chamber, the floor of which is composed of a plate pierced by nozzle through which combustion air is passed from a plenum chamber beneath. Interspersed between the air nozzles are a number of others through which fuel oil may be admitted. In operation combustion air under pressure is supplied to the plenum chamber, flowing upward between the bed particles. As the air supply increases the bed ultimately becomes fully fluidised, being supported entirely by the air stream and behaving very much like a boiling liquid. The temperature can be raised sufficiently to ignite fuel admitted through the fuel nozzles. The final operating temperature of the bed will depend upon how much heat is removed from it in relation to the amount of fuel/air admitted. Heat can be removed by water-cooled enclosure walls or by steam-cooled tubes. The bed can easily be operated at a temperature of, say, 850 deg C, compared with an atomised oil spray in a conventional boiler burning in suspension at 1,550 deg C; it is believed that the cooler process will prove less aggressive to tubular heating surfaces, and that the immersed tubes will be kept free of harmful deposits. The seven interrelated parameters to be considered when designing a fluidised bed heat exchanger are listed and described, and a typical layout for a 20 mW plant is shown. Order from BSRA as No. 49,959.

  • Supplemental Notes:
    • Abstract of a paper presented at a Conference on Steam Propulsion for Ships in the Changing Economic Environment, held in London.
  • Corporate Authors:

    Whitehall Technical Press Limited

    29 Palace Street, Westminster
    London SW1,   England 
  • Authors:
    • Hodgkin, A F
  • Publication Date: 1978-5

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Filing Info

  • Accession Number: 00194249
  • Record Type: Publication
  • Source Agency: British Ship Research Association
  • Files: TRIS
  • Created Date: Jun 13 1979 12:00AM