Abstract
This work presents the limitations of the Selective Exhaust Gas Recycle process for post-combustion capture from natural gas combined cycles using membranes and proposes a novel oxygen enriched air combustion with exhaust gas recirculation process that overcomes the limitations.
Highlights
Natural Gas Combined Cycle power plants with CO2 capture are expected to play an important role in a future carbon constrained energy scenario
While post-combustion capture from NGCC using solvents are considered as mature technology, the technology has disadvantages such as solvent degradation, high cost of capture and large footprint, the last of which is relevant for off-shore CO2 capture
Gas separation membranes are considered among one of the promising capture technologies [1] and has a few advantages over amine based solvent systems in that the process has no steam requirement and easy to retrofit to existing power plants and no environmental impacts caused by solvent losses and degradation
Summary
Natural Gas Combined Cycle power plants with CO2 capture are expected to play an important role in a future carbon constrained energy scenario. Exhaust Gas Recirculation (EGR) has the potential to increase the CO2 concentration in flue gas to around 8 vol% [2], membrane-based post-combustion capture is still not competitive at these conditions [3]. This process scheme has been subsequently used by other research groups to present a case for membrane based postcombustion capture from NGCC [5]
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