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Issue
Korean Journal of Chemical Engineering,
Vol.33, No.1, 63-72, 2016
Modeling and experimental studies of ammonia absorption in a spray tower
Zhu J, Liu Z, Bai J, Yang Y, Peng Q, Ye S, Chem M
We did an experimental study on ammonia absorption in a spray tower. The kinetic characteristics of droplets were investigated by considering the forces acting on a droplet. The gas-phase mass transfer coefficient was deduced with the Colburn analogy method. A simplified model for predicting NH3 capture with a spray tower has been presented based on mass transfer and ionic equilibrium, which was successfully validated against experimental data. The influences and the sensitivity analysis of main operating parameters on the absorption efficiency were analyzed. As the most sensitive parameter, the mean droplet diameter was obtained by fitting experimental data with an empirical correlation. The distributions of two typical process parameters along the absorber were also simulated. Decreasing the pH value of absorbent is an effective but restrictive way to strengthen the mass transfer rate on account of insufficient liquid-side resistance.
Keywords: Spray Tower; Ammonia; Model; Mass Transfer Coefficient; Absorption Efficiency
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