HYDROTHERMAL OF BROWN COAL AND ITS EFFECT ON INCREASING CALORIFIC VALUE AND WATER CONTENT
DOI:
https://doi.org/10.30556/imj.Vol28.No1.2025.1539Keywords:
hydrothermal, low-rank coal, calorific value, water contentAbstract
The need for coal as a national energy source for domestic consumption is increasing rapidly. The quality of Indonesian’s coal is generally categorized as a low rank. This can be seen from the ESDM 2020 data which is states that the number of low calorie coal resources is 53.6 billion tons, medium calorie quality is 79.89 billion tons, high calorie is 12.96 billion tons, and very high calorie is 2.48 billion tons. Low rank coal has a high water content which can be used for effective coal utilization. So we need a method to improve the quality of the coal. One of the methods is to apply hydrothermal technology which focuses on improving the quality of low rank coal with water medium and autoclave tool. The purpose of this study was to determine the effect of the ratio (b/v) between coal and water and the effect of particle size of a low rank coal with parameters of water content and calorific value using the hydrothermal method. In this hydrothermal process, the coal was heated at a temperature of 150◦C with a heating time of ±60 minutes, and the results obtained for the effect of the ratio (b/v) between coal and water there was an increase in the calorific value in the 25 mesh 50mL sample code of 5,849 kcal/kg and a decrease in water content of 5.10% in the same sample code, for the effect of particle size, there was an increase in the calorific value of the coal sample code 40 mesh 100mL by 5,789 kcal/kg and a decreased in water content in sample code 60 mesh 100 mL by 4.42%, where the initial calorific value before this hydrothermal process is 3,296 kcal/ kg and water content 44.34%.So it can be concluded that the hydrothermal process with heating without oxygen carried out by an outoclave can increase the calorific value of low rank coal by 2000 kcal/kg and reduce water content.
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