Fuels and Combustion
The main advantage of forced draft over natural draft is that

Combustion of fuel is complete
Smaller height chimney can be used
Furnace control is easier
All of these

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Fuels and Combustion
Low temperature carbonisation

Is mainly for producing the smokeless domestic coke
Produces less quantity of tar than high temperature carbonisation
Produces higher quantity of gas than high temperature carbonisation
Is meant for the production of 'metallurgical coke'

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