Pilot tests and rate-based modelling of CO2 capture in cement plants using an aqueous ammonia solution

Abstract

A rate-based model for the absorption of CO2 with aqueous ammonia solutions has been developed on the grounds of new CO2 absorption experiments performed at pilot plant scale. Tests have been performed with synthetic flue gases reproducing cement plant conditions. A thorough design of experiments has been carried out with the aim of studying the influence of several variables on the CO2 capture performance and obtaining a reliable model in a broad experimental space. The newly developed rate-based model makes use of a thermodynamic framework that predicts reliably the formation of solids in the CO2-NH3-H2O system in order to avoid operating conditions that lead to clogging of the absorber.