Fuels and Combustion
Low temperature oxidation of coal resulting from bad storage conditions does not decrease its

Hydrogen content
Oxygen content
Calorific value
Caking power

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Fuels and Combustion
Ratio of primary air to secondary air increases with increase in the rank of coal, because the

Ratio of fixed carbon to volatile matter increases
Oxygen content progressively decreases
Calorific value of the coal increases
High rank coals have higher amount of volatile matter

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