多效蒸發器

蒸發可以在常壓、加壓或減壓下進行。減壓下的蒸發稱為真空蒸發，溶液在低於常壓的條件下其沸點下降，因此可以提高有效的傳熱溫差。

    多效蒸發器是把前效產生的二次蒸汽用作後效的加熱蒸汽，使熱量得到多次利用
，可以比單效蒸發少用很多蒸汽。

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