Abstract: The present invention describes methods and apparatus for controlling the humidity of air supplied to cooling coils on a gas turbine powered ship through a dynamic desiccation system. The system passes supply air through a desiccant wheel, which dries and concomitantly heats the supply air. This supply air stream is then passed through a rotatable thermal wheel, wherein heat is transferred from the dry supply air to an exhaust-air mixture, thereby conditioning the supply air for delivery and circulation to a plurality of cooling-coil units in a plurality of compartments. The exhaust air from the compartments is first mixed with some of the treated supply air to lower the absolute humidity to a value needed for effective regeneration of the desiccant wheel. An evaporative cooler then conditions the exhaust-air mixture for effective cooling of the supply air in the thermal rotor, which also serves as an air preheater for desiccant regeneration.

Abstract: A forced-recirculation boiler (FRB) type of heat-recovery steam generator is applied to a ship-propulsion application of the recuperative dual-fluid engine. Such boilers generally include an economizer, evaporator and superheater, and incorporate a steam drum for controlling the flow of water-steam mixture through the evaporator. By altering the flow system of the FRB, the stability and integrity of the boiler are maintained by simultaneously providing, under any predetermined off-design, gas-side flow conditions, means for (1) limiting the gas-side cold corrosion of said boiler tubes through tube-wall temperature control, and (2) introducing a controllable sensible component into the heat load of said evaporator, thereby enabling, for any predetermined off-design steam rate, stable evaporator operation at a predetermined design steam quality.

Abstract: A steam-augmented gas turbine engine system generally includes a compressor 3), first and second combustors (4a, 4b), a compressor turbine (6) and a power turbine (7). A heat exchanging system (8b) removes heat from an exhaust product from the power turbine (7) and preheats water which has been desalinated by a water purification system (12). The desalinated water is provided to the first combustor (4a), as a predetermined quantity of water-steam mass, along with fuel and compressed air, and is used to efficiently power the turbine system. In one embodiment, a two-boiler system (8b) is employed in which first and second steam outputs are provided to first and second combustors (4a, 4b) such that a mass flow of the compressor turbine (6) is substantially constant from a Cheng point to a stoichiometric point of a predetermined power profile. This constancy of mass flow ensures that the gas generator operates on design from the Cheng point to the stoichiometric combustion point.