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Facts At Your Fingertips: Evaporator Equipment Types

By Scott Jenkins |

Industrial evaporator heat-transfer surfaces are either tubular or flat plates, packaged into a variety of evaporator types, as outlined here. Batch evaporators Batch evaporators are vessels with a heating jacket or internal coil, an overhead condenser, a condensate receiver, and usually, a vacuum source. After feed is charged into the vessel, heat is applied and evaporated vapor is condensed overhead, while the contents of the vessel decrease in volume and increase in concentration of non-volatile materials. Short-tube vertical evaporators A shell-and-tube heat exchanger is situated inside the evaporator vessel, near the bottom. The heat exchanger, called the calandria, contains an open area at the center, known as the downtake. Process fluid circulates upward through the calandria tubes, against condensing steam on the shell side. The vapor formed travels to the top of the evaporator, where entrained liquid droplets coalesce on a mesh pad and fall back into the boiling liquid. Meanwhile, the liquid emerging from the calandria tubes travels downward through the downtake, then back up through the tubes for a subsequent pass. Circulation occurs by natural convection. Long-tube vertical evaporators These evaporators operate with…
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