Fuels and Combustion
Higher fuel combustion efficiency can not be achieved by

Supplying correct amount of combustion air
Preheating of fuel gases & combustion air
Adopting proper fuel firing technique & fuel preparation
Reducing sulphur content in the fuel

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

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

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