Abstract: This paper introduces a design of the heat duty control strategy for methanol distillation column bottom.Based on the technical background of the processes and the analysis of the working conditions of the practical applications,taking into consideration that the dual heat exchanger is used as a reboiler in bottom of the distillation column,the heat duty control strategy is selected in the three-column methanol distillation control design.Simulations are given by using Aspen.In contrast to the regular temperature control scheme of methanol distillation,the method proposed in this paper has advantage of reducing the impurity content of the glycol ether.Moreover,the proposed methods can deal with the disturbance of flow rate and components variations.The quality of products could satisfy the industrial standard and requirement,which indicates that the proposed heat duty control scheme has definite significance and economic benefit in practice.

Key words: methanol distillation, temperature control, heat duty control, Aspen

摘要： 对甲醇精馏塔塔釜进行热焓控制方案设计并通过Aspen软件仿真验证。首先介绍了甲醇三塔精馏工艺背景,根据实际项目的工艺条件,精馏塔底部采用双换热器作为再沸器的特点,进行热焓控制方案的设计,然后,利用Aspen软件仿真,以出料杂质乙二醚的含量为参考标准,通过与甲醇精馏塔塔釜常规温度控制的对比验证了本控制方案中热焓控制的优势,在面对实际工况下常规的流量和组分变化扰动时,产品质量能达到工业生产的要求,具有一定的实际意义。

关键词: 甲醇精馏, 温度控制, 热焓控制, Aspen