Forced Circulation Evaporator

Forced Circulation Evaporator

Working theory & Application Industries

The single effect forced circulation evaporator comprises a heat exchanger, a separator and a circulation pump. The product is sent to the exchanger where it is heated and then sent to the separator. After evaporation, the liquid portion is pumped again to be resent to the exchanger. Forced circulation evaporator working involves the liquor being pumped through tubes at high velocity. The liquor goes from the bottom of the cone of the vapour body, through the tubes and then back into the vapour body. When the liquid comes out of the tubes and enters the vapour body, there is a sudden fall in pressure, leading to the flashing of superheated liquor. Hence, evaporation takes place in the vapour body.

The most common use of this evaporator is as an evaporative crystallizer with materials having relatively flat or inverted solubility. It can be used for continuous processing of such materials as Sodium Chloride, Sodium Sulfate, Magnesium Sulphate, Lithium Hydroxide, and similar crystalline materials.

Features

Long operating periods.

Boiling/evaporation does not take place on the heating surfaces but in the separator. Fouling due to incrustation and precipitation in the calandria is therefore minimized. 

Optimized heat exchange surface.

Flow speed in the tubes is determined by the circulation pump.