Rate Based Model and Techno-Economic Assessment of a Post-Combustion Co2 Capture Unit Operating With Potassium Lysinate for NGCC Decarbonisation

Abstract

The present work reports the results of process design and techno-economic assessment carried out on a CO2 capture unit operating with an aqueous solution of potassium Lysinate (LysK) at 43.7%w/w, in post-combustion arrangement for natural gas combined cycle (NGCC) decarbonisation. A dedicated rate-based model of the absorption unit has been defined and programmed in Matlab®. The techno-economic assessment of the reference natural gas combined cycle (frame-F gas turbine technology, 829.9 MWe without capture unit) coupled with a CO2 capture unit with the low-maturity LysK-based solvent has been carried out in order to estimate the energy penalty due to capture, the specific primary energy consumption per unit of CO2 avoided as well as economic indicators, such as overall capital costs, cost of electricity and the cost of CO2 avoided. The results are compared against a case study envisaging the same reference NGCC coupled with a commercial post-combustion capture solution working with 30%w/w aqueous monoethanolamine (MEA).