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

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Fuels and Combustion
Combustion of pulverised fuel

All of these
In a metallurgical furnace does not contaminate the product in the furnace by ash from fuel
Requires larger combustion chamber than rich gaseous fuel
Suppresses the discharge of fine dust and grit into atmosphere

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