基于PLC的城市污水处理控制系统设计_毕业设计1 精品

毕业设计

设计题目：基于PLC的城市污水处理控制系统设计

系别：信息工程系

班级：电子信息工程

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基于PLC的城市污水处理控制系统设计

摘要

随着城市现代化建设步伐的加快，城市污水处理控制系统也日益发展和完善。城市污水处理控制系统是城市现代化建设的重要组成部分，对提高城市形象，改善人民生活，保护环境具有重要的意义。

本文论述了PLC控制系统在城市污水处理中的重要应用，详细介绍了SBR 污水处理法自动控制系统的设计过程。本系统包括梯形图设计和监控组态设计两个方面，实现了中小型城市的污水处理自动控制和远程监控。系统主要由PLC、液位传感器、进水泵、滗水器、进泥泵及抽泥泵组成，分为手动和自动两种控制方式，使用梯形图语言完成系统对现场的控制；使用MCGS监控组态软件设计监控界面，不仅可以模拟演示系统工作状况，而且还可以对现场工作情况进行实时监控，并对系统进行远程控制，完成SBR污水处理法的自动运行。当系统发生状况时，能够及时发现，并停止系统，进行检修，减少污水处理过程中事故的发生。

关键词：PLC 城市污水处理MCGS组态软件SBR

The Design of Urban Sewage Treatment Controlled System Based on PLC

Abstract

With the quickening pace of urban modernization, urban sewage treatment control system has increasingly been developed and improved. The urban sewage treatment control system is a very important part of the urban modernization. It has the vital significance to improve the image of cities ,to improve peop le’s l ife and to protect the environment.

The paper discusses the important application of the PLC control system in the urban sewage treatment system. And the process of the design named SBR sewage treatment automatic control system is introduced in detail in the paper. The system which consists of the design of ladder diagram and the design of configuration, has realized the automatic control and the remote monitoring of the small and medium cities. The system mainly includes the PLC、the liquid level sensor、the water pump、the water decanter、the pump into the mud and the mud pump. The system has two control mode including the manual and the automatic ones to control the field on the ladder language. The system design the monitoring interface by the MCGS configuration, which can not only simulate the working condition of the demo system, but also monitor the working condition at a real-time. Besides, the interface can control the system remotely and finish the automatic operation of the method named the SBR sewage treatment. Problem can be found in time when the system goes wrong, and the system will stop working, then maintenance is needed to reduce the accidents in the process of the sewage treatment.

Keywords：PLC; urban sewage treatment; MCGS configuration software; SBR

目录

1 绪论 (1)

1.1设计背景 (1)

1.2研究目的和意义 (1)

1.3污水处理现状 (2)

1.4主要设计内容 (3)

2 污水处理工艺流程 (4)

2.1常用的污水处理工艺 (4)

2.2SBR法过程阐述 (7)

3 硬件设计 (8)

3.1PLC的介绍 (8)

3.1.1 PLC的结构 (8)

3.1.2 PLC的工作原理 (9)

3.1.3 PLC I/O口分配 (11)

3.2SBR法的总体设计 (12)

3.2.1 方案设计 (12)

3.2.2 硬件电路设计 (13)

3.3其他资源配置 (15)

3.3.1 接触器选型 (15)

3.3.2 液位计选型 (15)

3.3.3 滗水器选型 (15)

4 软件设计 (17)

4.1PLC程序设计分析 (17)

4.1.1 整体设计流程 (17)

4.1.2 手动设计流程 (17)

4.1.3 自动设计流程 (18)

4.2上位机界面设计 (24)

4.2.1 组态软件的介绍 (24)

4.2.2 设计要求及效果 (25)

4.2.3 定义数据对象 (26)

4.2.4 主界面的设计 (26)

4.2.5 实时报警 (28)

4.2.6 设备连接 (29)

4.2.7 脚本程序介绍 (32)