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Scaling
Scaling is the growth or deposition on heating surfaces of a fabric which is either insoluble or has a solubility that decreases amongst an growth inwards temperature. It may too trial from a chemic reaction inwards the evaporator. Both scaling as well as salting liquids are commonly best handled inwards an evaporator that does non rely upon boiling for operation.
Fouling
Fouling is the formation of deposits other than tabular array salt or scale. They may last due to corrosion, corporation affair entering amongst the feed, or deposits formed on the heating medium side.
Best mechanical engineering graduate programs:
Corrosion
Corrosion may influence the alternative of evaporator type since expensive materials of structure dot evaporators affording high rates of oestrus transfer. Corrosion as well as erosion are often to a greater extent than severe inwards evaporators than inwards other types of equipment because of the high liquid as well as vapor velocities, the frequent presence of suspended solids, as well as the concentrations required.
Product Quality
Product lineament may request depression holdup as well as depression temperatures. Low-holduptime requirements may eliminate application of roughly evaporator types. Product lineament may too dictate especial materials of construction.
Other Fluid Properties
Other fluid properties must too last considered. These include: oestrus of solution, toxicity, explosion hazards, radioactivity, as well as remain of cleaning. Salting, scaling, as well as fouling trial inwards steadily diminishing oestrus transfer rates, until the evaporator must last nigh downwards as well as cleaned. Some deposits may last hard as well as expensive to remove.