2017 Volume 96 Issue 6 Pages 167-175
To elucidate fundamental combustion behaviors of some solid combustible wastes, the isothermal combustion experiments are carried out, using an electrically heated vertical batch furnace. The effects of the furnace temperature and the oxygen partial pressure in the reaction atmosphere on the combustion behaviors are studied experimentally and kinetically. Comparing the experimental results obtained with the kinetic modelling results, the most optimum kinetic model is proposed for all of the samples employed, and the detail combustion mechanisms are also elucidated quantitatively. As a result, the completion period of the overall combustion decreases with increases of both the furnace temperature and the oxygen partial pressure. The evolution period of volatile matter (VM) is reduced in order from the bituminous coal, the oil coke to the waste plastic of composite materials. While, the reaction period by 95 % of the conversion is shorten in order from the oil coke, the waste plastic of composite materials and the bituminous coal. The reaction model for the oil coke is revealed as the parallel model of the volumetric model with the grain model. For both the waste plastic of composite materials and the bituminous coal, the parallel model the volumetric model of with the pore model agrees well with the respective experimental results. The activation energy of the fixed carbon (FC) combustion for the oil coke is the largest of the three. The activation energy for the waste plastic of composite material is almost the same as that for the bituminous coal. The reaction orders of the oxygen partial pressure for the VM evolution and the FC combustion become almost 0 and 1 for all of the samples, respectively.
