Patent ID: 7131259
Filing Date: 2006-11-07
Classification: F01K,Y02E,Y02P

Abstract:
1. A combined cycle power plant system comprising: two gas turbines configured to produce shaft work and exhaust gas; two supplementary fired heat recovery steam generators associated with respective said gas turbines, said heat recovery steam generators being configured to receive feedwater and to generate steam at predominantly a single pressure level using heat from said exhaust gas and from supplemental firing; a steam turbine configured to receive said steam from respective said heat recovery steam generators and to produce shaft work, wherein the operational ratio of the rated output of said steam turbines to said gas turbines (ST/GT) is at least about 0.75; and a control configured to control at least one of supplemental firing of said heat recovery steam generator and flow of said feedwater such that a balance is maintained between exhaust gas flow and feedwater flow.