[电气自动化]基于PLC的污水处理控制系统毕业论文设计_精品.docVIP

[电气自动化]基于PLC的污水处理控制系统毕业论文设计 Design based on the PLC industrial sewage processing system Abstract In recent years, sewage treatment plant has already become one of the most important infrastructures in every city, and especially in small and medium-sized ones, to build and expand such plants has been on the local governments’ top agenda to improve peoples’ life. With the development and improvement of automation technique and computer technology, automation level of sewage treatment plants has also made a corresponding leap. While PLC has series of merits such as: mature technique, fine universal property, high reliability, flexible to install, convenient to expand, excellent cost performance, etc, which have enabled it gain a more and more widespread application in industrial control. This paper will mainly introduce the composition and function of the automatic control system in sewage treatment plants and several problems that may occur in the practical use of the system and the possible solutions to them. Since the transformation by employing PLC control system in sewage treatment, the reliability of automatic control has been advanced, which has not only reduced workers’ work intensity, but also improved the operational efficiency of the sewage treatment plants, thus has made the scientific administration of manufacturing in sewage treatment plants possible. Key words: PLC, Sewage treatment,craftwork flow 目　　录 1 绪 论 5 1.1工业污水处理的发展趋势 6 1.2课题的背景 6 1.3研究目的和意义 7 1.4课题主要设计的内容 7 2 工业污水处理控制系统总体介绍 8 2.1工业污水处理基本概念 8 2.2 常用的工业污水处理工艺 9 2.3工业污水处理系统控制形式 11 2.4 工业污水处理系统的功能要求 14 3 硬件系统配置 15 3.1主要组成部分 15 3.2电气控制系统 16 3.3工业污水处理系统的工作原理 18 4 PLC的I/O资源配置 19 4.1数字量输入/输出部分 19 4.2模拟量输入/输出部分 20 4.3 PLC硬件接线图 21 5 调试和运行结果 22 5.1硬件系统的调试 22 5.2软件系统的调试 22 5.3运行结果 23 6 结论 24 参考文献： 25 致 谢 26 1 绪 论 我国是个缺水的国家，人均水资源占有量仅为世界人均占有量的1/4。而且我国的水资源在时空和地域分布上的分布不均匀，更加重了实际的缺水情况。因此近些年来我国城市水资源进一步紧张，许多城市严重缺水。与此同时，水资源污染却日益严重，因此许多工厂都建立自己的自来水处理厂，来改变目前水资源紧缺且污染的现状。而且我国水资源时空分布极不均衡，全国500多个城市缺水，其中多个严重缺水，北方地区