Forced Circulation Evaporator

In a Rising Film/Forced Circulation Evaporator liquid feed enters from the bottom of steam heated tubes. The parallel movement of liquid and vapour along tube surface imparts effective water evaporation from the liquid feed. This type of evaporator is ideal for liquids which attain high viscosity or have fouling tendency. The liquid feed is pumped into the steam heated tubes at an entering velocity of 2-6 m/s from the bottom. The liquid is superheated as the static head is reduced during flow from the heater to the vapour separator and it flashes into a mixture of vapour and liquid. Liquid returns to the Pump inlet, where it is recirculated. Vapour leaves from the top of the effects. This type of evaporator is ideal for concentration of viscous liquids with high specific gravity or that tend to form scaling.