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

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