Modeling on combustion characteristics of biocoalbriquettes

A biocoalbriquette, a new artificial solid fuel, is manufactured by a mixtu re of coal and biomass under a high-compression pressure. The combustion ch aracteristics of biocoalbriquettes were investigated in this study experime ntally and numerically. The combustion process of biocoalbriquettes appears in two stages: the volatile combustion stage followed by the char combusti on stage. it was found that the volatile combustion happens over the whole pellet of biocoalbriquette, whereas the char combustion proceeds in a shrin king-core mode. A volume model and a shrinking-core reaction model were int roduced and modified here to simulate the two stages of combustion process. The simulation results are found to be consistent with the experimental re sults.