Fuels and Combustion
A good metallurgical coke should have very low

Hardness & strength
Porosity
Sulphur & phosphorous content
Fusion point of its ash

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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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