Fuels and Combustion
In high temperature carbonisation of coal compared to low temperature carbonisation

Aromatic content of tar is low
Yield of ammonia is less
H₂ content in the coke oven gas is more
Calorific value of the coke oven gas is lower

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Fuels and Combustion
Cannel coal

All of these
Is non-coking
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

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