Briquette Technology of Low Grade Indonesian Coal


The distribution of low rank coal in many geographies accounts for almost 50% of the coal deposits of the world. Presence of high moisture and high propensity for spontaneous combustion limits its use in industries. An attempt towards reducing the moisture and enhancing calorific value would make the low rank coal more usable for different industries. For this study Indonesian coal has been considered as there are large resources of lignite/low rank coal specifically in Sumatra. Low rank coal (LRC) is also known as lignite or brown coal which has moisture content up to 45%. Their applications are limited due to spontaneous heating property, high volatile matter (VM). LRC is difficult to handle and involves high transportation cost also. If coal is only dried, it turns brittle and breaks down into dust while handling. After extensive research on Indonesian coal at laboratory and pilot scale, briquetting technology appears to overcome these inherent difficulties of LRC and is ready for experimental production. With briquette technology, coal is dried into tailor made briquettes of adequate strength. There are various advantages of coal briquettes like lower moisture content, higher heating value, improved plant efficiency, enhance safety, low transportation cost, reduce fire hazard, reduce space requirement and reduce green house gas emissions etc. Briquette technology can help standardizing Hardgrove Grindability Index (HGI) of coal and can be maintained at a value as suitable to the end user. This paper deals with briquetting technology which can produce 2000 TPD of desired quality briquetted coal out of low rank coal on a commercial scale.


Low Rank Coal, Briquette Technology, Volatile Matter, Hardgrove Grindability Index.

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