This kind of evaporator is a natural circulation device operated under vacuum conditions.
     The WZI includes three main series and another Q-type forced circulation evaporator. This product can be widely used in pharmaceutics, food and chemo-industry, etc in water and organic solutions vaporizing, especially suitable for temperature sensitive materials (e.g. water and alcohol extracting from herbal medicines, antibiotics fermentation broth, milk, and juice, etc.). It can condense continuously under vacuum conditions of low temperature to insure quality.