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

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Steam Boilers, Engines, Nozzles and Turbines
When the inlet pressure of steam is equal to the exit pressure, then

There is no pressure drop and fluid does not flow through the nozzle
There is a pressure drop in the nozzle
Pressure drops and fluid flows through the nozzle
Fluid flows through the nozzle

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