基于plc污水处理系统设计毕业论文.docVIP

河南科技学院 20届本科毕业论文（设计） 论文题目： 学生姓名： 所在院系：机电学院 所学专业： 导师姓名： 完成时间：2011 年 日 摘 要 Design of Sewage Treatment System Controlled by PLC With the rapid development of community economic technology and the constant improvement of the level of living in our country, the pollution of water becomes more and more serious. the sewage come from industry and town living increase continuously, but the city’s equipments which are used to drain sewage and dispose sewage are insufficient and some harmful substance which be not disposed were directly or indirectly pour into the river, then arose water pollution and appear to the problem about the aquatic environment’s pollution. 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 reliable administration of manufacturing in sewage treatment plants possible. Key words: PLC, Sewage treatment, SBR reaction 目录1 绪论 5 2 系统总体设计 5 3控制系统设计 6 3.1 格栅除污系统 6 3.1.1转鼓格栅除污机特点 6 3.1.2转鼓格栅除污机工作原理 7 3.1.3性能参数选择 7 3.2 调节池 8 3.3 SBR反应池 8 3.3.1 SBR工艺简介 8 3.3.2 曝气系统 9 3.4 排水系统 10 3.4 系统所需设备仪表 11 3.3.3 参量的选择与测量 12 4 控制系统设计 12 4.1 PLC选型 12 4.2 SBR控制系统流程图 13 4.3 PLC的I/O口分配 13 4.4 软件设计 14 4.5 系统外部接线图 15 5 上位机与下位机的设计 15 5.1 上位机设计 15 5.2 下位机设计 16 5.3 上位机与下位机之间的通信 16 5.3.1 PLC的通信功能 16 5.3.2 PLC的通信协议 17 6 通讯网络 19 6.1 中央控制室 19 6.2 控制分站 20 6.3现场监测仪表 20 7 结束语