Rising Film Evaporator works on Thermo-Siphon principle which helps in circulation of the fluid in a natural manner, eliminating the need of a centrifugal pump.
Our rising film evaporators provide good thermal performance because of high velocity generated by vapour lift. The biggest advantage here is the direct effect of creating high degree turbulence in the liquid due to upward movement against gravity.
A Rising Film Evaporator (RFE) is combination of vertical shell & tube heat exchanger and vapour-liquid separator mounted on top. The feed is given at bottom of shell & tube type heat exchanger and rises in tubes. Heat is given on the shell side by heating medium. As feed receives heat, vapour generated pushes the liquid on the wall as a film and lifts the liquid upwards. The mixture of liquid &vapour are separated at top in vapour-liquid separator.Good thermal performance is achieved because of high velocity generated by vapour lift.
Click on image for bigger view