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

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

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Fuels and Combustion
Fussain

All of these
Is non-coking, but when blended with highly coking coal, controls its swelling and produces high strength coke on carbonisation
Has highest fixed carbon and lowest volatile matter content of all the four banded components of coal
Is friable, charcoal like substance

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Fuels and Combustion
Washing of coal

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

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