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
Pulverizing coal in inert atmosphere
Heating wood in a limited supply of air at temperatures below 300°C
Binding the pulverized coal into briquettes

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

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

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