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

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

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Fuels and Combustion
Anthracite coal

Is essentially a coking coal
Burns with short, bluish, yellow-tipped flame producing very little smoke
Contains more volatile matter than bituminous coal
Ignites more easily than bituminous coal

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Fuels and Combustion
Cannel coal

All of these
Is non-coking
Is a non-banded coal which can be ignited easily with a match stick or candle flame, hence is so named
Has a high volatile matter content and burns with a luminous smoky flame

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