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

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

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Fuels and Combustion
Fussain

All of these
Is friable, charcoal like substance
Has highest fixed carbon and lowest volatile matter content of all the four banded components of coal
Is non-coking, but when blended with highly coking coal, controls its swelling and produces high strength coke on carbonisation

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Fuels and Combustion
Combustion of pulverised fuel

In a metallurgical furnace does not contaminate the product in the furnace by ash from fuel
All of these
Suppresses the discharge of fine dust and grit into atmosphere
Requires larger combustion chamber than rich gaseous fuel

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