Thermodynamic analysis of chemically recuperated gas turbines

Significant research effort is currently centred on developing advanced aero-derivative gas turbine systems for electric power generation applications, in particular for intermediate duty operation. Compared to industrial gas turbines, aero-derivatives offer high simple cycle efficiency, a quick and frequent start capability without significant maintenance cost penalty. A key element for high system performance (efficiency and power output) is the development of improved heat recovery systems, leading to advanced cycles such as the STeam Injected Gas Turbine (STIG) cycle, Humid Air Turbine (HAT) cycle or the Chemically Recuperated Gas Turbine (CRGT) cycle. In this paper the chronology of development of this last technology and a detailed description of our research program "Thermodynamic analysis of chemically recuperated gas turbines" is presented. A comparative study of the performance potentials of CRGT cycles and the other advanced cycles for design and off-design mode is presented. The analysis method accounts for turbine blade cooling requirements, which have a decisive impact on cycle performance. Exergy calculations are included in the analysis method. Research perspectives for this technology are suggested. (C) 2001 Editions scientifiques et medicales Elsevier SAS.