探讨了几十种基本的多级精馏装置的流程，并从节能的角度研究和分析它们的特点及适用条件。

This paper mainly probes into some basic flows of multistage distillation equipment, studies their features and analyzes applied conditions from the viewpoint of energy saving.

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多级多组分精馏过程的数学模型，通常都由物料平衡、能量平衡、相平衡和分子分数总和四个方程组来描述，即MESH方程组。

The mathematic model of multistage multi-component distillation is composed of material equation, heat equation, and equilibrium equation, namely MESH equation.

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