Steam Boilers, Engines, Nozzles and Turbines
Carbonization of coal is the process of

Strongly heating coal continuously for about 48 hours in the absence of air in a closed vessel
Heating wood in a limited supply of air at temperatures below 300°C
Binding the pulverized coal into briquettes
Pulverizing coal in inert atmosphere

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Steam Boilers, Engines, Nozzles and Turbines
In fire tube boilers

None of these
The flames and hot gases pass through the tubes which are surrounded by water
Forced circulation takes place
Water passes through the tubes which are surrounded by flames and hot gases

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