Experimental Investigation of the Combustion and Burnout of Two Different Coals

摘要

The physical and chemical behaviour of two types of pulverized coal, one Polish and one Australian, during combustion are compared in a 4 MW furnace and a drop tube furnace (DTF). The drop tube furnace experiment shows that the rate of combustion is controlled to a substantial degree by the rate of chemical reaction for Australian coal. For Polish coal, as reaction rates increase the rate becomes controlled by the combined effects of chemical reaction and pore diffusion. The differences in burnout for Polish coal curves in the experimental and DTF furnaces are explained in terms of diffusion and chemical reaction rates. The temperature coefficient of the reaction corresponded to a global activation energy of about 14 kcal/mole for Australian coal and 15 kcal/mole for Polish coal. (ERA citation 10:025215)