基于PLC的工业污水处理系统设计

河南科技大学

2009届本科毕业论文（设计）

论文题目：基于PLC的工业污水处理系统设计学生姓名：季洋洋

所在院系：机电学院

所学专业：机械设计制造及其自动化

导师姓名：王玉萍

完成时间：2009 年 5 月20 日

摘要

近年来,污水处理厂已成为各个城市最重要的基础设施之一。尤其是中小城市,新建或扩建污水处理厂已成为当地政府改善人民生活水平的头等大事。随着自动化技术、计算机技术的不断发展、完善,污水处理厂的自动化水平也相应提高。而PLC控制器以其技术成熟、通用性好、可靠性高、安装灵活、扩展方便、性能价格比高等一系列优点，在工业控制中得到了越来越广泛的应用。本文主要介绍了污水处理厂自动控制系统的组成、功能及如何利用PLC实现自动控制,并介绍了在系统实施中遇到的若干问题及其解决措施。在污水处理中采用PLC控制系统改造后，提高了自动控制的可靠性,不仅减轻了工人的劳动强度,而且提高了污水处理厂的运行效率和运行效益,实现了污水厂生产管理的科学性。

关键词：PLC,污水处理,SBR反应

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, SBR reaction

目录

1 引言 (1)

2 系统总体设计 (1)

3 控制系统设计 (2)

3.1 除渣 (2)

3.2 除油 (3)

3.3 中和处理 (4)

3.4 除有机物 (5)

3.5 除盐 (6)

4 PLC选型 (7)

4.1 PLC的I/O口分配 (8)

4.2 系统外部接线图 (9)

4.3 软件设计 (10)

5 上位机与下位机的设计 (10)

5.1 上位机设计 (10)

5.2 下位机设计 (11)

5.3 上位机与下位机之间的通信 (12)

5.3.1 PLC的通信功能 (12)

5.3.2 PLC的通信协议 (12)

6 通讯网络 (15)

6.1 中央控制室 (15)

6.2 控制分站 (15)

6.3现场监测仪表 (15)

7 结束语 (16)

致谢 (17)

参考文献 (18)