Simulation and exergy analysis of processes for CO₂ capture and utilisation for methanol production
by Oludare J. Odejobi; Chiazor F. Jisieike; Ambrose N. Anozie
International Journal of Exergy (IJEX), Vol. 17, No. 4, 2015

Abstract: Carbon dioxide (CO₂) capture and methanol production processes were simulated using Aspen RefSYS. Exergy analysis was done with EXCEL spreadsheet. Parametric study was done on the CO₂ process to investigate the effects of absorber and reboiler pressure, absorber stages and amine circulation rate on CO₂ absorption, CO₂ recovery and process exergy efficiency. The result shows that stripper recovered almost 90% by mass of CO₂ in the flue gas. The highest irreversibility in the CO₂ capture plant occurred in the rich/lean heat exchanger (820516.24 MW); this is followed by the lean cooler (481343.23 MW) and the stripper (404273.57 MW). CO₂ emissions reduction was 171,838.1 tonnes CO₂/yr. For the methanol plant, the highest irreversibility occurred in the distillation column (25088.4 MW). The study concluded that onsite utilisation of CO₂ from thermal plant would minimise CO₂ leakage during transportation or storage.

Online publication date: Tue, 01-Sep-2015

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