Characteristic features of heat transfer in circulating fluidized bed boilers

• The characteristic features of heat transfer in circulating fluidized bed boilers are described. First, the conditionsfor heat transfer are listed. Then, examples of measurements from the research boiler at Chalmers Universityof Technology are presented, including thermal and fluid-dynamic boundary layers as well as heat transfercoefficients measured with a heat flow meter and with thermocouples mounted on the tube walls of the boiler.Differences in heat transfer efficiency of the fins and of the tubes of a membrane tube wall are shown. Finally,heat transfer mechanisms are briefly discussed, and the influence of the macroscopic flow pattern caused byexit, secondary air, etc. is indicated.

Ämnesord

TEKNIK OCH TEKNOLOGIER  -- Maskinteknik -- Energiteknik (hsv//swe)

ENGINEERING AND TECHNOLOGY  -- Mechanical Engineering -- Energy Engineering (hsv//eng)

Nyckelord

Circulating fluidized beds

Boiler

Heal transfer

Publikations- och innehållstyp

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