Most boilers produce steam to be used at saturation temperature; that is, saturated steam. Superheated steam boiler vaporizes the water and then further heats the steam in a superheater. This provides steam at much higher temperature, but can decrease the overall thermal efficiency of the steam generating plant because the higher steam temperature requires a higher flue gas exhaust temperature. There are several ways to circumvent this problem, typically by providing an economizer that heats the feed water, a combustion air heater in the hot flue gas exhaust path, or both.
Superheated steam presents unique safety concerns because, if any system component fails and allows steam to escape, the high pressure and temperature can cause serious, instantaneous harm to anyone in its path. Since the escaping steam will initially be completely superheated vapor, detection can be difficult, although the intense heat and sound from such a leak clearly indicates its presence.
There are advantages to superheated steam that may, and often will, increase overall efficiency of both steam generation and its utilization: gains in input temperature to a turbine should outweigh any cost in additional steam boiler complication and expense. There may also be practical limitations in using wet steam, as entrained condensation droplets will damage turbine blades.
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Superheated steam boiler vaporizes the water and then further heats the steam in a superheater.
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