Patent ID: 7426832

Claim:
A closed-cycle gas turbine power generator system comprising: a combined cycle system with a neutral gaseous primary motive medium and a secondary phase change medium wherein the combined cycle system has a lower pressure sub-system having a counter-rotating compressor module in combination with a counter-rotating gas turbine module, and a higher pressure sub-system having a counter-rotating compressor module and a counter-rotating gas turbine module wherein the phase change medium in liquid form is injected into the compressor module of the lower pressure sub-system and the compressor module of the higher pressure sub-system during compression of the primary motive medium for substantially isothermal compression with the liquid phase change medium changing to a gas that mixes with the gaseous primary motive medium to form a compressed gaseous mixture; a heat source wherein the compressed gaseous mixture is heated by the heat source and supplied to the gas turbine module of the higher pressure sub-system for partial expansion and the partially expanded gases are supplied to the gas turbine module of the lower pressure sub-system for expansion wherein a portion of the compressed gaseous mixture from the compressor module of the lower pressure sub-system is heated by the heat source and combined with the gaseous mixture from the gas turbine module of the higher pressure sub-system and expanded in the gas turbine module of the lower pressure sub-system; and, a condenser wherein the expanded gaseous mixture from the gas turbine of the lower pressure sub-system is delivered to the condenser for separation of the phase change medium as a liquid from the gaseous primary motive medium.