Fuels and Combustion
A coal having higher volatile matter content, has lower

Ignition temperature
Smoking tendency on burning
Coke oven gas yield on carbonisation
Chance of catching fire during storage in open space

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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
High rank coals have higher amount of volatile matter
Calorific value of the coal increases

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