(618g) Efficiency and Cost Comparison Between Dual-Stage a-Mdea and Selexol Processes for Carbon Dioxide Capture in a 300-MW-Class Integrated Gasification Combined Cycle (IGCC) Power Plant

In order to minimize the environmental impact of power plant operations and reduce the CO₂ emissions, carboncapture processes (CCPs) become an important technological issue. In this study, various CCPs for a 300-MW-class integrated coalgasification combined cycle (IGCC) power plant were simulated to evaluate thermal and economic efficiencies. As a first step, the efficiencies of single-stagea-MDEA, Selexol, Pufisol, Rectisol and Cryogenic processes as an acid gas removal unit (AGRU)were evaluated for a screening test. Considering both thermal efficiency based on screening test and the balance between chemical and physical solvent systems, dual-staged a-MDEA and Selexol processes for AGR and CCP were rigorously evaluated in view of power generation, power consumption, exergy destruction, as well as economic analysis.The results indicated that Selexol exhibits better thermal efficiency. And operating cost of Selexol process was also cheaper than that of a-MDEA process for capturing a ton of CO₂.However, the capital cost of Selexol process was more expensive thanthat of a-MDEA process. Based on the exergy analysis, the detailed exergy flow and destruction were illustrated to evaluate the impact on everyconstituent component of each CCP.And the development direction to improve the efficiency of each CCP was suggested. The results in the study can be used as a springboard in decision-making and process development for commercial-scale CCPs in view of thermodynamic and economic analyses.