BURNING CHARACTERISTICS OF HIGH-ASH BANGLADESHI PEAT

The combustion characteristics of high-ash Bangladeshi peat was invest igated in an atmospheric fluidized-bed combustor at bed temperatures o f 750, 800 and 850 degrees C. The particle size was varied from 8.05 m m to 22.76 mm. Combustion of this variety of peat occurred at constant size and thus followed a shrinking core model. Volatile evolution is complete before the particles reached bed temperature and during char combustion the particle temperature exceeded the bed temperature. Comb ustion times can be represented by power law equations. Results indica ted that the burning rate of peat char is a combination of diffusion a nd kinetic control mechanisms.