Forced Circulation Evaporator
Working Principle
A forced circulation evaporator utilizes an external power source to circulate the feed solution. A circulation pump forces the liquid to flow in one direction through the heating tubes at a velocity of 1–5 m/s, where it is superheated under pressure higher than the normal boiling point pressure. Upon entering the separator, the pressure of the liquid drops rapidly, causing part of the liquid to flash or boil instantaneously. By maintaining forced circulation, the flow velocity in the tubes and the liquid temperature can be independently controlled according to a pre-selected temperature difference to meet product requirements.
Special Characteristics
Large concentration ratio; forced circulation enables efficient evaporation of high-viscosity liquids.
Uniform heating within the tubes due to forced circulation helps prevent "dry-wall" phenomena.
The main disadvantages are the large pump flow rate required, leading to relatively high power consumption, and the significant equipment vibration caused by high flow rates, which necessitates mounting the entire structure on factory floors or steel support frames, thereby increasing investment in plant or structural support.
Forced circulation evaporators can be used in single-effect or multi-effect configurations but are often combined with falling film evaporators to serve as high-concentration or crystallizing evaporators. They are particularly suitable for high-viscosity liquids, scaling-prone liquids, and high-concentration stages in multi-effect evaporation systems. Shennong Co., Ltd. can provide different design options based on product specifications and customer requirements.
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