A new semi-closed gas turbine cycle with CO2 separation

work, a new Semi-Closed Gas Turbine Cycle (SCGT) configuration is presented , named Semi-Closed Gas Turbine/Regenerative Combined Cycle (SCGT/RCC). The SCGT/RCC is an hybrid combination of the SCGT/CC and SCGT/RE cycle concept s, including both partial regeneration of the gas turbine and coupling to a bottoming steam cycle by a small-size Heat Recovery Steam Generator (HRSG) . An energy and exergy analysis is carried out for several configurations a nd operating conditions. A preliminary analysis of the RHE size, CO2 absorp tion potential and related effects on the cycle performance is presented, a t several operating conditions and investigating three possible plant opera tion modes. The performance of the SCGT/RCC is very interesting at optimize d operating conditions (specific power exceeding 550 kJ/kg of compressor in let flow rate, efficiencies close to 50% including a 80% CO2 removal). This plant is a promising solution that combines the positive features of semi- closed gas turbines, allowing a drastic reduction of size and capital costs for both HRSG and RHE and maintaining high values of performance. (C) 1999 Elsevier Science Ltd. All rights reserved.