Abstract
The effects of shape change on combustion of pulverized coal particles have been investigated in order study of pulverized coal combustion in high oxygen contest. In this experiments, pulverized coal particles were fed into a vertical laminar flow furnace at 1073 through 1223 K. The combustion mechanisms were studied by the various characteristics of sampled particles at arbitrary position in the furnace.
Experimental relationship between unburnt carbon ratio and residence time has been observed as two staged straight lines, which shows ordinaroly, the volatile matter combustion region followed by the char combustion region. However, the cause of this combustion transition was the change of particle structure. The char combustion occurred simultaneously in the volatile matter combustion region, and the volatile matter remained in almost burnt particles. The combustion of pulverized coal particles were influenced by the shape change of particles such as pore formation and explosion which resulted from rapid coal devolatilization.
