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

Pulverizing coal in inert atmosphere
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

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Steam Boilers, Engines, Nozzles and Turbines
In regenerative air preheaters, the heat is transferred

From a metal wall from one medium to another
Heat is transferred by bleeding some gas from furnace
From heating an intermediate material and then heating the air from this material
By direct mixing

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