A NEW SEMI-CLOSED GAS TURBINE CYCLE WITH CO2 SEPARATION

In this work, a new Semi-Closed Gas Turbine Cycle (SCGT) con®guration 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 concepts, 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 con®gurations and operating conditions. A preliminary analysis of the RHE size, CO2 absorption potential and related e ects on the cycle performance is presented, at several operating conditions and investigating three possible plant operation modes. The performance of the SCGT/RCC is very interesting at optimized operating conditions (speci®c power exceeding 550 kJ/kg of compressor inlet ¯ow rate, e ciencies 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.