ABSTRACT
This paper presents off-design evaluation of a natural gas-fired Chemical Looping Combustion (CLC) Combined Cycle with CO₂ capture. The unconventional combined cycle employs an air-based gas turbine, a CO₂ turbine and a steam turbine cycle. The proposed combined cycle has a net plant efficiency of 52.15% at full-load. At 50 % load the efficiency drops by 3.6 %-points. The efficiency drop at part-load is higher when compared to a conventional combined cycle. The pressure in CLC-reduction and oxidation reactors is balanced by airflow reduction, using a compressor equipped with variable guide vanes. A combination of control strategies are discussed for plant start-up and part-load below 56 % when airflow reduction is not practically possible with current generation of compressors.