Fuels and Combustion
A coal gasifier opearating at 20 atm. (e.g. Lugri gasifier) as compared to one operating at atmospheric pressure (e.g. Kopper-Totzek or Winkler gasifier) will produce a gas having

Higher carbon monoxide content
Higher methane content and thus higher calorific value
Lower carbon dioxide content
None of these

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Fuels and Combustion
Lignite is

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

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