Journal
ENERGY
Volume 32, Issue 4, Pages 360-370Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.energy.2006.07.011
Keywords
power generation; natural gas; CO2 capture; circulating fluidised bed; solids internal recirculation; metal oxide reductions; metal oxidation; combined cycle; variable guide vanes
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This paper presents part-load evaluation of a natural gas-fired chemical looping combustion (CLC) combined cycle with CO, capture. The novel combined cycle employs an air-based gas turbine, a CO2-turbine and a steam turbine cycle. In this combined cycle, the CLC reactors replace combustion chamber of the gas turbine. The proposed combined cycle has a net plant efficiency of about 52.2% at full-load, including CO, compression to 200 bar. The part-load evaluation shows that reducing the load down to 60% results in an efficiency drop of 2.6%-points. However, the plant shows better relative part-load efficiency compared to conventional combined cycles. The pressure in CLC-reduction and -oxidation reactors is balanced by airflow control, using a compressor equipped with variable guide vanes. A combination of control strategies is discussed for plant start-up and shutdown and for part-load when airflow reduction is not practically possible with current generation of compressors. The results show that the combined cycle has a promising efficiency even at part-load: however, it requires an advanced control strategy. (c) 2006 Elsevier Ltd. All rights reserved.
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