Fuels and Combustion
Lignite is

A coking coal
Can be used for gasification and steam generation
A high rank coal
A black banded coal which burns with a non-smoky yellowish flame

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

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

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

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

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