For applications where tube coating is a problem, the preferred choice is a forced circulation flash evaporator. The main components are a horizontal shell and tube heat exchanger, a flash chamber mounted above the heat exchanger, and a circulating pump. Evaporator liquid circulates through the heat exchanger tubes at high velocity to inhibit coating and enhance heat transfer. Liquid from the heat exchanger enters the flash chamber w

here water is flashed off. Since there is no coating in the heat exchanger, evaporator performance remains constant without expensive cleaning procedures.