Patent ID: 6216436
Filing Date: 2001-04-17
Classification: F01K,F02C,Y02E

Abstract:
In an integrated gasification combined cycle power generating system having a plurality of turbines, including first and second vapor turbines and a gas turbine for driving one or more generators for generating electricity or mechanical work, and a fuel gasifier for generating fuel gas for the gas turbine, a method of operating the system comprising the steps of:(a) generating fuel gas from the fuel gasifier;(b) providing a heat recovery fluid from the fuel gasifier;(c) supplying the fuel gas from said fuel gasifier to a combustor for the gas turbine to drive the gas turbine;(d) expanding a two-component working fluid through the first vapor turbine;(e) reheating the expanded two-component working fluid from the first vapor turbine;(f) expanding the reheated two-component working fluid through the second vapor turbine;(g) condensing the working fluid exhausted from said second vapor turbine in a distillation/condensation sub-system;(h) passing the condensed working fluid in heat exchange relation with hot exhaust gases from the gas turbine for flowing heated working fluid to the vapor turbines; and(i) additionally heating the two-component working fluid supplied to the vapor turbines by passing the working fluid in heat exchange relation with the heat recovery fluid.