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

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

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

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

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