Fuels and Combustion
Coals used for the generation of producer gas should have

Low fusion point of ash
High caking index
High volatile matter content
Very low ash content (8-10%)

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Fuels and Combustion
The weathering index of a coal

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

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