Fuels and Combustion
A good metallurgical coke should have very low

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

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Fuels and Combustion
With increase in the temperature of carbonisation of coal

All of these
Methane content in the coke oven gas decreases and carbon monoxide content increases
Hydrogen content of coke oven gas increases due to cracking of hydrocarbons
Calorific value of the coke oven gas decreases due to cracking of hydrocarbons which is not compensated by increase in CO & H? content

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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
Enhanced sensible heat loss in the flue gas
High exit flue gas temperature from the furnace
Intermittant and uncontrolled combustion of the fuel

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