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  • Multiple effect evaporation is abbreviated as MEE. Multiple effects are relative to single-effect, which has only one effective evaporator, while multiple effects have multiple evaporators; The biggest difference is that the single-effect steam is directly condensed, while the secondary steam of the front effect body of the multi-effect is continuously utilized to save energy consumption. Multi-effect evaporation is the main means of energy saving. Generally speaking, the more effects there are, the better the steam economy will be. Generally, three-effect and four-effect are more common. Multi-effect evaporators are divided into tube-type and plate-type multi-effect evaporators in terms of form, and there are also differences in evaporation types such as falling film evaporation, rising film evaporation, and co-current and counter-current evaporation.

    Plate multi-effect evaporator

    System Composition

    Plate multi-effect evaporator

    Plate multi-effect evaporator Process Description

    Multi-effect heating and evaporation

    In multi-effect evaporation, heating steam is introduced into the first effect, and the secondary steam generated from the first effect serves as the heating steam for the second effect. The heating chamber of the second effect, in turn, functions as the condenser for the first effect. The secondary steam produced from the second effect then serves as the heating steam for the third effect, and so on, with multiple evaporators connected in series to form a multi-effect evaporation system.

    Temperature, Boiling Point, and Concentration Changes

    Due to the decreasing operating pressure in each subsequent effect during multi-effect operation, the final effect of a multi-effect evaporator in production is connected to a vacuum device. The heating steam temperature and the boiling point of the solution decrease sequentially in each effect, while the concentration of the finished liquid increases gradually.

    Condensation

    The secondary steam from the last effect enters a condenser, where it is cooled and condensed into water for removal.

    Multi-effect evaporators are characterized by high efficiency, energy saving, compact structure, stability, reliability, and strong adaptability. They reduce energy consumption by utilizing secondary steam, feature compact equipment and a high degree of automation, which minimizes human error and makes them suitable for various materials and process treatments.

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    High Efficiency and Energy Saving

    The most prominent feature of multi-effect evaporators is their high efficiency and energy saving. By fully utilizing the energy of secondary steam, the energy consumption of multi-effect evaporators is more than 30% lower than that of single-effect evaporators.

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    Compact Structure

    Multi-effect evaporators have a relatively compact structure and occupy a small footprint. Due to their multi-stage evaporator series connection, the equipment has a smaller volume, enabling better integration with other equipment in the production process and improving production efficiency.

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    Strong Adaptability

    Multi-effect evaporators can accommodate different materials and perform various process treatments.

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