Assessment of chemical absorption/adsorption for post-combustion CO2 capture from Natural Gas Combined Cycle (NGCC) power plants

Abstract The fossil fuel power generation sector is facing critical decisions to significantly reduce CO 2 emissions by implementing carbon capture technologies at industrial scale for transition to low carbon economy. This paper assesses the usage of reactive absorption/adsorption systems for post-combustion CO 2 capture from Natural Gas Combined Cycle (NGCC) power plants. As reactive gas–liquid absorption system assessed for post-combustion CO 2 capture, the alkanolamine-based gas–liquid absorption was evaluated (MDEA was considered as illustrative example). As reactive gas–solid adsorption system, the innovative Calcium Looping (CaL) method was considered. The work evaluates how chemical absorption/adsorption influence the techno-economic performances of NGCC power plants. As benchmark option used to quantify the carbon capture energy and cost penalties, NGCC plant without CO 2 capture was considered. The post-combustion carbon capture options have at least 90% carbon capture rate. As the results show, CaL concept exhibits improved environmental performances (e.g. >98 vs. 90% carbon capture rate) and economic indicators (e.g. 969 vs. 1238 €/kW net power as specific capital investment, 42.82 vs. 46.24 €/MWh as O&M costs, 56.91 vs. 66.12 €/MWh as electricity cost etc.) compared to MDEA case.

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