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

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

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Fuels and Combustion
The weathering index of a coal

Is a measure of its size stability, when stored & exposed to weather
Is related to its calorific value
Gives an idea of the fusion temperature of ash
Is a measure of its caking tendency

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