化工单元操作中理论板与传质单元数之间关系的探究

填料塔与板式塔是化工单元操作过程中的常见设备,而填料塔中填料层高度的计算与板式塔中理论板数的确定是关键,教材中有关填料层高度的计算采用的是传质单元数法,而板式塔中理论板的确定采用是Mc Cable-Thiele方法来确定的,有关传质单元数与理论板它们之间的关系介绍的较少。本文采用吸收因子法详细介绍了理论板数与传质单元数的求法,并由此建立了它们之间的定量关系,可用于二类塔的比较,对于填料塔的分析与设计具有一定的指导作用,有助于对吸收与精馏单元操作过程的学习与理解。

Study on the Relationship between the Theoretical Plate Number and the Mass Transfer Unit Number in Chemical Unit Operation

Packed tower and plate tower were common equipment in the operation of chemical units. The calculation of the height of the packing layer in the packed tower and the determination of the number of theoretical plates in the tray tower were the key. The calculation of the height of the packing layer in the textbook was based on the mass transfer unit, and the determination of the theoretical plate in the plate tower was determined by the McCable-Thiele method, and the relationship between the number of mass transfer units and the theoretical plate was less. In this paper, The mass transfer unit number and the theoretical plate number were respectively calculated by the absorption factor method in detail, and the quantitative relationship between them was established. It could be used for the comparison of the two type towers, which had a certain guiding role for the analysis and design of the tower, and helped students to learn and understand the process of absorption and rectification unit operations.