Nurulhuda Halim
In this research, the effect of heating temperature during coal raising on coal composition and characteristics, combustion reactivity, and water vapor re-adsorption behavior of lignite with high water content to determine the optimal raising temperature. Indonesian lignite is used as raw material. The sample was divided into two parts; one part is used as reference raw coal, and the other part is heated to a temperature ranging from 60 to 500 °C. and then held for two hours in an inert atmosphere. The results show that the size of the coal particles becomes finer as the heating temperature increases. At 150°C, the water content drops while the volatile matter content remains almost constant, resulting in an optimal temperature for energy production. There was a change in element content as indicated by the release of the -OH functional group at a temperature of 200°C, aliphatic methyl group and -C=O at a temperature of 400°C, and -C-O- at a temperature of 500°C. Combustion reactivity indicates that the upgraded coal has difficult-to-combust properties and is self-igniting. Improved quality of coal can minimize moisture re-adsorption and reduce the balance moisture content of coal both in controlled environments and outdoors.
Studying the effect of coal heating temperature on the quality of the coal produced. Studying the effect of coal heating temperature on coal reactivity. Studying the effect of coal heating temperature on moisture re-adsorption behavior
This research is a starting point for understanding the behavior of low rank coal, especially high-moisture coal, whose reserves amount to billions of tons, which in the future will become the backbone of meeting national energy needs. This high humidity needs to be reduced so that combustion efficiency in the PLTU or furnace can be optimal. Therefore, the results of this research can be used as a basis for determining the optimal upgrading temperature.