13.14.2 Settler (Decanter) Design

Settler design is just as important and just as empirical as mixer design. Although vertical settlers are used, horizontal settlers are much more common because the settling area is easily increased by making the settler longer. A schematic of a settler illustrating a number of design features is shown in Figure 13-33 (Frank, 2008; Jacobs and Penney, 1987). The feed pipe is increased in diameter to reduce the fluid velocity before entering the settler. Immediately after entering, the feed may be sent sideways with a tee. The baffles or diffuser (a sieve plate with ~ 1/2-inch holes) help calm the fluid motion. At the outlet end, the baffles for the light and heavy liquid also help calm the fluid and prevent entrainment. ...

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