Abstract: An apparatus for generating electrical and/or mechanical energy from at least a low-grade fuel comprises a closed circuit in which steam is formed in a steam boiler fired with low-grade fuel, the steam formed in superheated in a superheater with the aid of heat originating from a heat source in which high-grade fuel is burned, the superheated steam is fed to a steam turbine in which the steam is expanded, thereby delivering work, the expanded steam is condensed in a condensor and the condensed steam is fed back to the steam boiler via a condensate degasser. The combination of forming steam with the aid of heat originating from low-grade fuel and superheating said steam with the aid of heat originating from high-grade fuel provides a process for converting fuel into electrical and/or mechanical energy with a relatively high overall efficiency.

Abstract: An auxiliary steam superheater designed to be easily added to an existing steam system to boost the steam temperature to approximately 750.degree. F. This superheater comprising a steam coil system enclosed by an insulated casing which defines a central radiant heating chamber with the coil system spaced inwardly from the inner surface of said casing to provide a convection heat passageway. Hot gases from a heat source are introduced through one end of the casing and into the "interior" of said coil system, thus providing radiant heat directly to the inner surface of said coil system and utilizing the "black body" heat transfer principle. An exhaust flue is provided at the top of said casing in close association to the end of the casing where the hot cases are introduced, the gases flowing through the interior of said coil system and out around the coil along said convection heat path before passing out of said chamber through said flue.

Abstract: A vapor generator organization arranged for operation in a marine reheat power plant is described in which the reheater tube bundle is disposed in the rear gas pass section of the unit where it is subjected only to low temperature combustion gas during periods of ship maneuvering when no vapor flow occurs through the reheater tubes. A separately fired burner arrangement is operably disposed in the rear gas pass and adapted to be fired at times when the reheater is operative in the system.