Characteristic features of heat transfer in circulating fluidized bed boilers
Artikel i vetenskaplig tidskrift, 1992
The characteristic features of heat transfer in circulating fluidized bed boilers are described. First, the conditions
for heat transfer are listed. Then, examples of measurements from the research boiler at Chalmers University
of Technology are presented, including thermal and fluid-dynamic boundary layers as well as heat transfer
coefficients 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 by
exit, secondary air, etc. is indicated.
Circulating fluidized beds