Multi Effect Evaporator

In a multiple - effect evaporator, effluent is boiled in a sequence of vessels, each held at a lower pressure then the last. Because the boiling temperature of water decreases as pressure decreases, the vapor boiled off in one vessel can be used to heat the next, and only the first vessel requires an external source of heat.

In industrial effluent application feed to Evaporator have salts which are corrosive and have scale forming tendency. To handle this we select Forced Circulation Evaporator is the ideal choice. In this type of evaporator, liquid is pumped through heat exchanger tubes at high velocity avoiding precipitation and creating high turbulence, liquid is then passed through vapor separator for separation of vapor and finally condensing the vapor in the condenser. Concentrated liquid is continuously discharged from the bottom of the vapor separator. Though they consume higher power than conventional evaporators, this gets compensated by Reduced Scaling Tendency, Reduced Downtime and Reduced Cleaning Frequencies.

ZLD is then achieved in the ATFD where MEE rejection is finally converted into solid waste in baggable form. Typical Agitated Thin Film Evaporator consists of a tubular heat transfer area with an external heating jacket and a fast-revolving, inner rotor with flexible or rigid wiper elements.