(707a) Capture and in-House Utilizations of Carbon Dioxide in Pulp and Paper Manufacturing
This research work focuses on the capture of CO2 from the limekiln flue gas using the conventional Monoethanol Amine (MEA) solvent absorption process and the in-mill application of CO2. A process simulator, ASPEN Plus, is used to model the carbon dioxide capture process. The CO2 capture rate and the purity used in the simulation is adjusted to meet the CO2 amount required for in-mill applications. We performed a preliminary techno-economic analysis (TEA) for the CO2 capture process. Our results match the results presented in the literature: The equipment costs in the absorption setup are shadowed by the operating costs, which include the reboiler steam, cooling water and electricity. We further coupled the CO2 capture process simulation with a derivative-free optimization (DFO) tool to identify the overall optimal configuration by minimization of the total capture cost. The absorber stages, stripper stages, economizer temperature, solvent lean loading and the MEA weight concentration of the lean solvent were the decision variables. The process configurations suggested by the DFO revealed that the carbon dioxide capture cost is minimum for a process with three absorber stages, eleven stripper stages, and which is run at an economizer temperature of 98 °C, solvent lean loading of 0.215 with a 46.92 wt% MEA concentration. The corresponding CO2 capture cost for this process is $38.85 per ton of CO2 captured.
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