The parameters optimization for a CFBC pilot plant experimental study of post-combustion CO2 capture by reactive absorption with MEA

The aim of the paper consists in analyzing the effects of primary amines used (monoethanolamine - MEA) for CO2 post-combustion capture on operating parameters for circulating fluidized bed combustion coal technology (CFBC). Primary amines are characterized by a higher chemical reaction with CO2 but, also by a lower absorption capacity compared to secondary and tertiary amines. Additionally, the primary amines necessitate a higher energy required for solvent regeneration than the secondary and tertiary amines. Therefore, several process parameters have been optimized for reducing the heat required by the MEA regeneration and for increasing the CO2 capture process efficiency. The process parameters analyzed in the optimized study were: amine (MEA) concentration in solvent; solvent flow; lean and rich loading solvent with CO2; temperature of solvent in the absorption and stripper unit, etc. The heat required for solvent regeneration was 3.1 GJ/tonne CO2 obtained by process parameters optimization (MEA concentration in solvent 40 wt.% and lean loading solvent 0.42 mol CO2/mol MEA). For 30 wt.% MEA concentration in solution, the energy required was 3.3 GJ/tonne CO2 obtained for the optimal lean loading solvent of 0.44 mol CO2/mol MEA. (C) 2012 Elsevier Ltd. All rights reserved.