Fuels and Combustion
Coke oven gas is a better fuel than blast furnace gas, because of its higher

Calorific value, cleanliness and relatively low distribution cost (due to its low specific gravity)
All of these
Heat release rate (thus requiring smaller combustion chamber)
Adiabatic flame temperature

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Fuels and Combustion
Producer gas containing least amount of tar is produced by the

Atmospheric pressure gasification of coal (e.g., in Kopper-Totzek gasifier)
High pressure gasification of coal (e.g. in Lurgi gasifier)
Partial combustion of coal
Partial combustion of large size (< 50 mm) coke

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