Fuels and Combustion
Desirable "Micum Index" values of metal-lurical coke are

M40 > 98% and M10 < 2%
M40 > 78% and M10 < 10%
M40 > 10% and M10 < 78%
M40 > 4% and M10 < 80%

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

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

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