Natural circulation evaporators utilize vertical tubes which operate by the thermo siphon principle. The density difference between the boiling liquor and the circulating liquor in Natural circulation evaporators produces the driving force for liquid circulation. In operation, feed enters the lower liquor chamber in Natural circulation evaporators. As it travels up the tubes of the Natural circulation evaporators and reaches boiling point, vapour forms and carries liquor to the separator.
Most Natural circulation evaporators require liquor recirculation. When feed quantities are sufficient, in Natural circulation evaporators, single pass operation is utilized. Applications of Natural circulation evaporators include anhydrous caustic, beet sugar, foamy liquors. Natural circulation evaporators are also applied in low or moderately viscous liquors and precipitating liquids.
No comments:
Post a Comment