Fuels and Combustion
Washing of coal

Improves its coking properties
Controls its ash fusibility and increases its calorific value
All of these
Reduces its sulphur and ash content

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

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