ABSTRACT
The combustion of solid fuels begins by the ignition of volatilized gas after the evolution of volatile matter takes place in a high-temperature region. There are many kinds of solid fuels, including coal, oil sand, oil shale, refuse fuel, and biomass, and coal is the most abundant among these solid fuels. The most common and useful methods for analyzing these solid fuels are the proximate and ultimate analyses. The combustion processes are as follows: moisture in solid fuels is immediately vaporized when solid fuels enter into a high-temperature region in a furnace, evolution of volatile matter takes place, the volatilized gas is ignited and volatile combustion occurs, char combustion follows the volatile combustion and the combustion is terminated. The combustion of the volatilized gas due to the evolution of volatile matter with combustion air takes place in the gaseous phase. The remaining combustible char is exhausted as pure char particles or contained in ash particles.
