HEAT TRANSFER BETWEEN A CIRCULATING FLUIDIZED BED 
AND EXTENDED SURFACES: ACCOUNT FOR PRESSURE AND 
TEMPERATURE EFFECTS

Yu. S. Teplitskii

UDC 66.096.5

A phenomenological model of heat transfer  in  the transport 
zone  of  a  circulating  fluidized  bed (CFB) is developed; 
the model allows for basic specific features of the process: 
a gas gap at the  riser  wall,  the  temperature  profile in 
a horizontal cross section  of the riser, and the dependence 
of  their  characteristics  on  the  concentration   of  the 
particles.  On  the  basis  of  model concepts test data are 
generalized  in  the form of simple semi-empirical relations 
for calculating the  conductive-convective  component of the 
coefficient of heat transfer  and  the  total coefficient of 
heat transfer between extended surfaces (L > 0.5 m)  and the 
CFB in the transport zone.  These  formulas  allow  for  the 
effect of pressure and temperature and are  verified  within 
a  rather  wide  range  of  variation  of  the  experimental 
conditions.