and Economic Assessment of Selexol-based
Technology for IGCC Power Plants"
Increasing CO2 emissions and concerns about potential climate
change are arousing great interest in the technical and economic feasibility
of capturing CO2 from large energy system, such as coal-based power
plants. Performance and cost models of a Selexol-based CO2
absorption system for capturing CO2 from an advanced power system
(Integrated Gasification Combined Cycle, IGCC) have been developed and
integrated with an existing IGCC modeling framework without CO2
capture. The integrated model has been applied to study the feasibility, cost
and uncertainties of carbon capture and sequestration at both greenfield and
repowered IGCC plants. The analysis shows that based on commercially available
technology, the cost of CO2 avoided for an IGCC power plant is half
that for a conventional combustion plant with a chemical absorption process.
For IGCC systems, the uncertainty associated with CO2 transport and
storage has the largest impact on the cost of CO2 avoided. Under
suitable conditions, IGCC repowering was shown to be an attractive option for
reducing CO2 emissions from existing coal-fired plants. Compared to
building greenfield IGCC plants, IGCC repowering also provides an option for
introducing new power generation technology with lower risk to utilities.
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