Abstract
Indonesian coal was upgraded by upgraded brown coal (UBC), hot water drying (HWD), and steam drying (SD) processes to study the combustion characteristics of this coal. The differential thermal–thermogravimetric analysis (DTA–TG) was carried out to obtain some combustion parameters, such as, ignition temperature (Tig), maximum combustion rate temperature (Tmax), maximum combustion rate (Rmax), char burn-out temperature (Tbo), and ash yield. The differential thermal analyzer (DTA) curve can be used to estimate the heat released during the combustion process, which corresponds to the high heating value of the coal. The results show that the combustion characteristics of HWD and SD processes are much better than those of the UBC process. This is because the UBC process was conducted at lower temperature and pressure.
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