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Comment PDF Separation Processes

Crystallizers And Agitators

By Jean-Claude Gallot and Amnon Schur |

    New crystallization-system designs rely on previous successful installations and rules for scaling-up systems to adapt to slightly different conditions. However, guidelines or rules of thumb have underlying assumptions that might have been ignored when scaling-up a system during the design phase. This practice often leads to difficulties in practical application. This point will be clearly illustrated by the following real-life example.   Draft-tube-baffle crystallizers Draft-tube-baffle (DTB) crystallizers are used to produce coarse material with a long wash-out cycle. The draft tube conveys the solids to the boiling surface, where supersaturation is the highest, and the baffle provides a positive means to control both slurry density and population balance. Hundreds of DTB crystallizers have been installed over the past 40 years. Most of them have performed as designed and serve as references for future designs. Geometrically similar crystallizers have the same pressure drop, which is expressed as a multiple of the draft tube velocity head. Knowledge of this rule certainly makes it easier for the agitator manufacturer to match equipment to the desired operating conditions. But determining how well this match is…
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