forced circulation evaporators are normally used for liquids which are prone to fouling, scaling, and crystallizing or for those which are inversely soluble or while concentrating thermally de-gradable materials. here high re-circulation rate allows high liquor velocities through the tubes which help to minimize the buildup of deposits or crystals along the heating surface. the universal type, preferably used for concentration of solutions containing encrusting substances, hardening agents and un-dissolved solids, and for viscose solutions; also suitable for evaporative crystallization.
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