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Processing & Handling :: Separation (Liquid-Liquid & Gas-Liquid) :: Distillation

June 1, 2014

Fine Tune the Design of Sour-water Strippers Using Rate-based Simulation

A look at the benefits of using simulations in the design of SWS units, and some practical tips on SWS operation

Soumitro Nagpal Fluor Daniel India Pvt. Ltd.

Equilibrium-stage models, which form the basis for rate-based calculations, are first evaluated by looking at the impact of sour-water feed H2S and NH3 content, stripper column equilibrium stages on stripped water NH3 and H2S content, and stripping energy consumption. Two commercial process simulators are used and the results are compared with SWS operating and design data from several sources. Subsequently, a commercially available rate-based model was used to simulate stripper performance and estimate tray efficiencies. The rate-based model calculated significantly higher NH3 tray efficiency (~60%) compared to the common industry practice of using NH3 tray efficiencies of of 20–25%.

Stripper and associated equipment design and operational guidelines are also discussed.

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