Steam separator

A steam separator, sometimes referred to as a moisture separator or steam drier, is a device for separating water droplets from steam. The simplest type of steam separator is the steam dome on a steam locomotive. Stationary boilers and nuclear reactors may have more complex devices which impart a "spin" to the steam so that water droplets are thrown outwards by centrifugal force and collected. All separators require steam traps to collect the water droplets that they remove.
It is important to remove water droplets from steam because:
Steam drier is also sometimes applied to a drier which operates as a low-temperature superheater, adding heat to the steam.