The energy value of coal can vary significantly depending on its grade and type. Coal is classified into several categories, including anthracite, bituminous, sub-bituminous, and lignite, with each having different energy content. 1. **Anthracite:** This type of coal has the highest carbon content (around 86–97%) and energy value, typically ranging from about 24 to 30 million British thermal units (BTUs) per ton.
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