Steam Boilers, Engines, Nozzles and Turbines
For the same diameter and thickness of tube, a water tube boiler compared to a fire tube boiler has

Equal heating surface
Less heating surface
Heating surface depends on other parameters
More heating surface

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

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