Difference b/w Low & High Rank of Coal

Low Rank coal. High Rank coal

•Low carbon • High carbon

content content

•Low calorific • High calorific

value. value

•Low thermal •High thermal

conductivity. conductivity

•High moisture •Low moisture

•High volatile. •Low volatile

•High Ash •Low Ash

content. content

Lower Rank coals are more liable/prone to spontaneous heating compared to Higher Rank coals.

Lower to higher rank coal:-Peat.< Lignite < Bituminous <Anthracite

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