安徽工程大学本科
毕业设计（论文）
专 业： 自动化
题 目： 基于PLC的水厂滤池
自动控制系统设计
作 者 姓 名：
导师及职称：
导师所在单位： 电气工程学院
2012 年 6 月 13日
安徽工程大学毕业设计（论文）
基于PLC的水厂滤池自动控制系统设计
摘 要
水厂供水对人们至关重要。随着现代城市社会和经济的发展，城市用水量不断增加，供水量不足己成为城市发展的瓶颈，而地下水资源的利用已近饱和，增加地表水供应量是解决供水不足问题的唯一可行途径。供水不仅要满足管网的需要、保证充足供水，还要求水质明显提高。因此对水厂关键工艺进行升级改造，以提高其水处理能力，增加出水量，是满足城市发展需要的有效途径。滤池是水厂常规处理净构筑物的最后一道工序，滤池运行的好坏直接影响到水厂的出水水质。
论文的研究目标是系统的解决供水企业的自动控制滤池反冲洗工艺复杂，如果仍然沿用人工方式，劳动强度大，工作效率低，安全性难以保障，为此必须进行滤池自动化系统的改造。
本文主要进行如下工作：对供水企业自动化的发展历史、自动化系统类型以及供水企业自动化的应用状进行了详尽的分析和综述。对水厂滤池工艺做了简要介绍。滤池的液位控制以及反冲洗控制和控制策略作了分析。相关PLC硬件联接以及程序的编写和组态仿真。
关键词：PLC；水厂滤池；反冲洗；液位控制
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丁家根：基于PLC水厂滤池自动控制系统的设计
The Design of Filter Pool Automatic Control System in Waterworks based on PLC
Abstract
Water plant water supply is essential for people. As the modern urban society and economic development, urban water consumption continued to increase water supply insufficient has become the bottleneck of the urban development, the use of groundwater resources is nearly saturated, increasing the supply of surface water is the only feasible way to solve the problem of inadequate water supply. Water supply not only to meet the needs of the pipe network, to ensure adequate water supply, but also significantly improve the water quality. Therefore, the critical process of the water plant upgrade to improve its water treatment capacity, increasing the amount of water is an effective way to meet the needs of urban development. The filter is the last of the waterworks net structure of the conventional treatment process, the filter is running a direct impact on water quality of the water treatment plant.
The goal of this thesis is a systematic approach to solving water supply automatic control filter backwash process, the continued use of artificial means, labor-intensive, low efficiency, security is difficult to protect, and this must be the transformation of the filter automation systems.
In this paper, the following work: A detailed analysis and synthesis of the history of the development, the type of automation system and water supply enterprise automation of water supply enterprise automation application status. A brief introduction on the water plant filters process. Filter the liquid level control, and backwash control and control strategies are analyzed.PLC hardware connections as well as procedures for the preparation and simulation configuration.
Keywords: PLC; the water plant filter; backwash; liquid level control
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安徽工程大学毕业设计（论文）
目 录
引 言 .............................................................................................................................. - 1 - 第1章 绪 论 .............................................................................................................. - 3 - 第2章 滤池基本工艺 ........................................................................................................ - 4 - 2.1取水 .................................................................................................................................................. - 5 -
2.1.1 废水的一级处理 ..................................................................................................................... - 6 - 2.1.2 废水的二级处理 ..................................................................................................................... - 7 - 2.1.4 自来水厂水源处理 ................................................................................................................. - 7 -
2.2加药、沉淀 .................................................................................................................... - 8 - 2.3 过滤 ............................................................................................................................... - 9 - 2.4 出水 ............................................................................................................................... - 9 - 2.5 水厂滤池系统工艺特点 ............................................................................................. - 10 -
2.5.1 V型滤池工艺介绍 ................................................................................................................ - 10 - 2.5.2 V型滤池的组成以及控制任务 ............................................................................................ - 12 - 第3章 滤池控制策略 ........................................................................................................................ - 13 - 第4章 滤池液位控制的实现 ................................................................................................................. III 第5章 滤池反冲洗控制 .......................................................................................................................... V 第6章 PLC控制的实现 ..................................................................................................................... VIII
6.1 PLC基本知识及其工作原理 ..................................................................................... VIII 6.2 传感器和执行器的选择 ................................................................................................... X 6.3 系统I/O设计 .................................................................................................................. XI 6.4 软件方案的设计 ............................................................................................................ XII
6.4.1 滤池正常过滤恒水位程序设计 ...............................................................................................XII 6.4.2 滤池反冲洗控制程序设计 .......................................................................................................XII 第7章 监控系统设计 .......................................................................................................................... XIX 结论与展望 ............................................................................................................................................. XXII 致 谢 ............................................................................................................................................... XXIII 附 录A ............................................................................................................................................ XXV 附 录B ............................................................................................................................................. XXX
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基于plc的水厂滤池自动控制系统设计本科毕业论文
