Fuels and Combustion
Beehive coke oven

Gives larger yield of coke (around 85%) as compared to by-product ovens
Facilitates by-products recovery
Takes 2-3 days for coking of coal but requires no external fuel for heating
Produces coke with very poor strength

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Fuels and Combustion
Cannel coal

All of these
Is a non-banded coal which can be ignited easily with a match stick or candle flame, hence is so named
Has a high volatile matter content and burns with a luminous smoky flame
Is non-coking

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Fuels and Combustion
The weathering index of a coal

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

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