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
Strongly heating coal continuously for about 48 hours in the absence of air in a closed vessel
Binding the pulverized coal into briquettes

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Steam Boilers, Engines, Nozzles and Turbines
In an impulse turbine

The steam is expanded both in fixed and moving blades continuously
The steam is expanded in moving blades only
The steam is expanded in nozzles only and there is a pressure drop and heat drop
The pressure and temperature of steam remains constant

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