Power generation system incorporating multiple rankine cycles

Abstract

A power generation system () and a method of generating power. In one embodiment of the system shown in FIG., a gasification subsystem () is configured to convert a carbonaceous fuel to fuel suitable for combustion in a gas turbine (). A first power generation cycle () includes the gas turbine () coupled to receive fuel from a gasifier (). A first Rankine cycle () is coupled to receive thermal energy from at least the first power generation cycle () and generate power with a first vapor turbine (). A second Rankine cycle () is coupled to receive thermal energy from the gasification subsystem () or the first power generation cycle () and generate power with a second vapor turbine (). In an associated method, syngas () is generated and processed to remove components therein. Power is generated in a first turbine () with the processed syngas (). Power is generated in a second turbine () with heat recovered from exhaust produced by the first turbine (). Power is generated in a third turbine () with heat recovered from the syngas ().