The Collaborative International Dictionary
Superheater \Su"per*heat`er\, n. (Steam Engine) An apparatus for superheating steam.
Wiktionary
n. A component of a boiler system that heats the steam produced above its saturation temperature to prevent it condensing, and in case of a steam engine to improve its efficiency.
Wikipedia
A superheater is a device used to convert saturated steam or wet steam into superheated steam or dry steam. Superheaters are used in steam engines or in processes, such as steam reforming. There are three types of superheaters: radiant, convection, and separately fired. A superheater can vary in size from a few tens of feet to several hundred feet (a few metres to some hundred metres).
Usage examples of "superheater".
He recognized the M-type, recalling the design from engineering school, with separately fired superheaters producing 600 psi main steam.
These diagrams show, and label, certain major components of the boiler system (the firebox and its grate, the water circulation, the steam dome, and the superheater tubes), the engine system (the steam chest, the valve, and the cylinder-and-piston), the transmission system (the crosshead, main rods, and connecting rods), the driving and leading wheels, the valve control system (the eccentric crank and rod), the exhaust system (exhaust pipes, smoke box and smokestack), and the control system (throttle valve, throttle lever, safety valve).
The wet steam from the steam dome is fed into narrow tubes which enter the top row of superheater tubes from the smoke box end, make a U-turn at the firebox end, and exit.
They may then enter and leave a second or third row of superheater tubes the same way before delivering the now superheated steam to the steam chest.