Steam Introduction and Initial Evaporation

In the MEE system, external heating steam is introduced into the first effect to heat the feed liquid to boiling, causing partial solvent evaporation and forming secondary steam. This secondary steam is then used as the heating steam for the second effect, driving the evaporation process there. Meanwhile, the heating chamber of the second effect functions as the condenser for the first effect, where the secondary steam from the first effect condenses and releases heat.

Tandem Evaporation and Heat Transfer

The secondary steam generated in the second effect continues to serve as the heating steam for the third effect, and so on, with multiple evaporators connected in series to form the MEE system. The secondary steam from each effect serves as the heating medium for the next effect, enabling gradual heat transfer and utilization. As the operating pressure in the evaporation chambers decreases from effect to effect, the heating steam temperature and boiling point of the solution also decrease sequentially, while the concentration of the finished liquid increases.

Vacuum Operation and Condensation

In production, the final effect of the MEE is usually connected to a vacuum device to maintain a low-pressure environment, further lowering the boiling point of the solution and enhancing evaporation efficiency. The secondary steam from the final effect enters a condenser, where it is cooled by water and condensed into water, which is then removed, completing the entire evaporation process.