Abstract
A balanced portfolio of mitigating power generation technologies is required to meet global CO2 reduction targets, of which Integrated Gasification Combined Cycle with CO2 Capture and Storage (IGCC-CCS) from coal is one. The sour water gas shift (WGS) reaction is a key conversion step in the IGCC-CCS process and is responsible for about 44% of the efficiency penalty that CCS would confer on IGCC with current technology, due principally to the diversion of steam from steam turbines to the shift process. A multi-faceted development program has been undertaken to drive down this penalty, considering different reactor types, new catalyst formulations and process integration. Process evaluation has shown cost of electricity (CoE) reductions of 3-4% with the combination of significantly reduced steam addition and the utilisation of improved reactor designs with initial catalyst performance data. Higher reductions in CoE of up to 7% are obtainable, dependent upon the gasifier selection. This translates to reductions of up to US $8/MWh for power production on the most efficient flow-sheets.
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