Steam Boilers, Engines, Nozzles and Turbines
The ratio of the energy required to produce the artificial draught (expressed in meters head or J/kg of flue gas) to the mechanical equivalent of extra heat carried away per kg of flue gases due to natural draught, is known as

Power of the boiler
Efficiency of the boiler
Efficiency of the fan
Efficiency of the chimney

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

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

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