An experimental study was performed for the combustion of coal mixture having the same composition as the anthracite briquette in domestic use. A mathematical model was also proposed and the results of theoretical analysis were compared to the experimental results. The purpose here is to investigate the combustion characteristics of the anthracite briquette and to develop a relevant mathematical model.
Using a spherical sample, we measured the weight change as a function of reaction time by virtue of a spring thermo-balance. Examined and dixcussed here are the effects of major parameters on the combustion characteristics such as reaction temperature, flow rate of air, and sample size.
A shrinking core model was established by taking into account the generation of carbon monoxide on the surface of unreacted core, the oxidation of carbon monoxide in the ash layer and the diffusional resistance through the ash layer as well as the external mass transfer resistance. The result of model analysis reveals that, although the overall trend is in agreement with the experimental observations, it would be necessary toe improve the model by considering the non-isothermal aspect of the combustion system.