Rate-Based Modeling of CO2 Absorption in Aqueous NH3 in a Packed Column☆

2013 
Abstract A rigorous rate-based model for the aqueous ammonia (NH3) based CO 2 absorption in a packed column has been used to simulate the recently available results from pilot plant trialing of aqueous NH3 based post combustion process (PCC) at the Munmorah power station, New South Wales, Australia. The model is based on RateSep module, a rate- based absorption & stripping unit operation model in Aspen Plus®, and uses an improved thermodynamic model for NH 3 -CO 2 -H 2 O system to predict the performance of CO 2 capture. The evaluation of the thermodynamic model via validation of vapor liquid equilibrium and heat of absorption of the NH 3 -CO 2 -H 2 O system shows that the model can satisfactorily predict experimental results from the published literatures. The predicted results from the rate-based model also agree reasonably well with pilot plant results including CO 2 absorption rate and NH 3 loss rate. The rate- based model is then utilized for the extended study of the effect of operation pressure, aqueous NH3 concentration and liquid inlet temperature on the CO 2 absorption and NH3 loss. Two different absorber configurations split flow and inter-cooling have been investigated as possible options for control of the NH3 loss.
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