Fuels and Combustion
Lignite is

A coking coal
A high rank coal
Can be used for gasification and steam generation
A black banded coal which burns with a non-smoky yellowish flame

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

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

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