化工专业毕业论文--基于DCS的二元精馏过程控制系统设计.docVIP

摘 要 精馏是一种利用回流使液体混合物得到高纯度分离的蒸馏方法，是工业上应用最广的液体混合物分离操作，广泛用于石油、化工、轻工、食品、冶金等部门。精馏的目的是利用混合液中各组分具有不同的挥发度，将各组分分离并达到规定的纯度要求。 本文主要围绕精馏过程的DCS控制系统设计，选取了丁醇塔为研究对象，在分析其工艺流程和系统构成的基础上，结合实际系统，进行了以下研究： 1、分析了精馏过程的影响因素和扰动变量，并结合实际情况，详细设计了精馏过程的控制方案,包括串级控制、分程控制等。 2、利用浙大中控JX-300X.DCS软硬件资源，根据装置的I/O点统计和功能需求，进行集散系统的选型和控制系统设计，并阐述了集散控制系统的控制站组态、操作站组态等。 3、针对系统控制功能实现的技术方法进行了分析，证明了DCS系统在精馏过程中控制的有效性。针对精馏塔塔釜温度控制，提出了改进控制方案，即Smith预估补偿控制。 本文设计的精馏过程DCS控制系统是一种新型有效的系统，达到了设计要求。 关键词：精馏塔，集散控制系统，串级控制，Smith预估补偿控制The Design of Binary Distillation Process Control System Based on DCS Abstract Distillation is a method that makes liquid mixture obtain the separation of high purity by returning, is the most widely used separation of liquid mixture operation in industry, widely used in petroleum, chemical industry, light industry, food, metallurgy and other sectors. The purpose of distillation is to make the components separate and achieve the required purity requirements, use their different volatility. In this paper, I focused on the distillation process controlled by DCS, selected butyl alcohol tower as the object of researching. Based on the analysis of its process, system structure and the actual control system, I conducted the following studies: 1, I analyzed the impact of factors and disturbance variables in distillation process, and based on the actual situation, designed the distillation process control system, including cascade control, split control and so on. 2, I used SUPCON JX-300X.DCS hardware and software resources, based on the device I / O point statistics and functional requirements, selected the distribution system, designed the control system , then described the configuration of distributed control system, control station, operator station configuration and so on. 3, Based on the methods of implementing system control functions, I demonstrated the effectiveness of DCS system to control the distillation process. Focused on the temperature control of distillation reactor, I proposed an im