Steam generating plants

In a conventional construction of a steam generating plant wet steam is separated from the liquid phase in a steam drum and is fed to a superheater constructed of stainless steel and through which liquid metal is passed in heat exchange with the steam. If water droplets suspended in the wet steam are carried into the superheater there is a risk that stress corrosion will occur and this could prove hazardous by enabling steam to come into contact with the liquid metal. In the arrangement described means are provided for recirculating a fraction of the superheated steam leaving the superheater to the inlet side of the superheater, thus providing heat for evaporating water droplets in the wet steam. The means for recirculating may comprise an injector in the wet steam supply line to the superheater. (U.K.)