Fuels and Combustion
Coal tar fuels (CTF) as compared to petroleum based fuel oils have higher

Calorific value
Difference in gross & net calorific value
Higher C/H ratio
Sulphur content

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Fuels and Combustion
Fixed carbon in coal is defined as

The one which is present in the residue after combustion
The total quantity of carbon present in the coal
Hundred minus the percentage of volatile matter, ash and moisture
That present in volatile matters

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Fuels and Combustion
Washing of coal

Reduces its sulphur and ash content
All of these
Improves its coking properties
Controls its ash fusibility and increases its calorific value

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