Abstract: The ethanol rectification device is the plant in which 95% ethanol is thrice rectified to make it anhydrous ethanol. The process is a batch reaction, the control system uses PLC multi-loop of the series-wound adjustment, to improve the precision of control and the automation. The advantages such as flexible control of PLC, multiple functions, the convenient key technical parameters setting and the open-and-shut interface of the operating system etc. Will finally make it applied extensively in the ethanol rectification device.

Key words: Ethanol rectification, Series-wound adjustment, PLC, PID, Configuration software

摘要： 乙醇精馏装置是将纯度为95%的乙醇经三重精馏生成无水乙醇的生产工艺。该工艺属于间歇反应，控制系统若采用PLC多回路串级调节，可以提高系统的控制精度和自动化水平。实践结果表明，由于PLC组态控制灵活、接口功能丰富、参数设置方便，操作界面直观，将在精馏装置中得到广泛应用。

关键词: 乙醇精馏, 串级调节, PLC, PID, 组态软件