Forced Circulation Evaporators


Mazda Forced Circulation Evaporators are recommended for the concentration of high viscocity solutions/slurries having tendency to crystallize or produce scales.


Ideal for high crystallizing and high viscosity solutions & slurries
Single or multiple effect operation
High operational flexibility, heat transfer co-effecients, vapour liquid separation
Low temperature rise operation
Minimised fouling due to high velocities & static head
Available in a range of corrosion resistant materials
High turn down ratio


Common Salt
Herbal Extracts
Calcium Chloride
Sodium Sulphate
Ammonium Sulphate
Manganese Sulphate
Ammonium Nitrate


Forced Circulation
Evaporator Characteristics

Operates with extremely low temperature differences
High tube velocity
Velocity mechanically produced and controlled
Gives high rate of heat transfer, rapid evaporation and high concentration without requiring high operating temperatures or large heating surface
Maximum recovery of solids
Can use horizontal or vertical tubes
Tubes are readily accessible for cleaning and inspection
Suitable for single or multiple effects

Product Application

Very viscous liquids
Scaling liquids tending to produce scale
Heat-sensitive materials
Crystal producing liquids

Pilot Plan

In order to determine the most suitable type of eveaporator, to simulate the actual processconditions, and understand the effectiveness of the equipment Mazda has installed a full fledged pilot plant evaporator facility.

The Pilot Plant consists of Falling Film Evaporators & Forced Circulation Evaporator systems complete with vapour thermo-recompressorsnd slurry classifyers.
The Pilot Plant is manned by skilled engineers & technicians who will provide advice and assistance during trials.


In a forced circulation evaporator, liquor is pumped from the bottom cone of the vapor body through the tubes of the heat exchanger, where heat is added, and back into the vapor body where evaporation occurs.

Sufficient liquid height (submergence) is maintained above the liquor inlet on the vapor body and above the heat exchanger tubes to suppress mass boiling in the inlet and prevent boiling at the tube surface. This is necessary to prevent precipitation in the tubes which would lead to fouling of the heat transfer surface.