Fuels and Combustion
The main drawback of supplying more excess air in the combustion of fuel is the

Enhanced sensible heat loss in the flue gas
High exit flue gas temperature from the furnace
Excessive power requirement of air blower
Intermittant and uncontrolled combustion of the fuel

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Fuels and Combustion
Washing of coal

Improves its coking properties
Reduces its sulphur and ash content
Controls its ash fusibility and increases its calorific value
All of these

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