Abstract:
The quality of coal in indonesia often in the form of coal of inferior rank such as lignite (brown coal) which having high water content, low calories, and high self-combustion level. To increasing low rank coal usage, be required to upgrading of that low rank coal quality. Therefore needs to be done the way coal lignite coal can compete with high quality, so lignite coal can have high economic value, and then created a method to increase coal quality for increase calories level and reduce water content, regarding to these condition then were made an coal upgrading with some method. So low rank coal can be used as good as possible as basic raw energy which in developed in Indonesia and one of the method for upgrading coal quality is coal drying and coating with finacoal and enzol. On upgrading process the coal sample have been prepared for 2.88 mm, 5.66 mm, and 8 mm and then the sample have been heated on temperature 1000C, 1500C, dan 2000C after that add finacoal and enzol on coal sample. The addition of solution would serve as coal void protector so the water content which have evaporated can’t be turn back to coal void again. The result from this upgrading proces such as inherent moisture content is going down from 22.37 % to 8.25 % for coated sample, and 7. 74 % for not coated sample. Ass content before process as 4.15 % and after process ass content for coated sample become 4.06 %, then for not coated sample ass content increase become 4.33 %. Vollatile matter content from 40.62 % has reduced after process become 39.26 % for coated sample, and for not coated sample become 40.40 %. Fixed carbon before process as 32.86 % then increased after process become 48.43 % for coated sample, then 47.53 % for not coated sample. Calories value from 4750 cal/gr become 5555.44 cal/gr for coated sample, and 5409 cal/gr for not coated sample. Coal drying process was effective for reduce water content, so calories value was increase. Coating process with finacoal and enzol was good enough for reduce ass content and vollatile matter then increasing calories value.
