Energy and Cost Evaluation of A Low-temperature CO2 Capture Unit for IGCC plants

Abstract

The application of CO2 capture by liquefaction has been investigated for an integrated gasification combined cycle (IGCC). Two configurations of the process are developed–one supplying CO2 at conditions suitable for pipeline transport and the second one producing liquid CO2 suitable for ship transport. The liquefaction process for CO2 capture is more efficient and compact compared to Selexol process for providing CO2 suitable for ship transport as the separation and liquefaction units are integrated in the process presented in this work. An economic analysis performed shows that CO2 capture by liquefaction is more cost efficient than corresponding Selexol-based separation processes by 9–11% in terms of the levelized cost of electricity and 35–37% in terms of CO2 avoidance costs