Thermo-economic analyses of concepts for increasing carbon capture in high-methane syngas integrated gasification combined cycle power plants

•Increasing carbon capture in IGCCs with high CH4 syngas.•Combusting separated CH4 in sequestration stream is most cost and water effective.•Recycling separated CH4 back to gasifier has highest efficiency.•Cost of electricity for 90% carbon capture ranges from 138.1 $/MWh to 143.4 $/MWh. An integrat...

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