基于PLC的水厂滤池自动控制系统毕业论文.doc

基于PLC的水厂滤池自动控制系统设计
摘要
水是生命之源,供水自然关系到国计民生的重要地步,供水不仅要满足工业用水,还要满足生活用水,农业用水等等,其中最为重要的是生活用水,各城市的大中小水厂是生活用水的直接来源,水厂滤池的好坏不仅影响出水的质量,更关系到人民的生命安全,所以水厂滤池在供水中起到很重要的作用,以前的水厂滤池大都使用人工控制,不仅费力,而且劳动强度大,劳动效率低,出水的质量也很难保证,因此,对水厂滤池提出自动化改造已经是很有必要的事情了。
在设计之初,从网络上查阅了当前水厂滤池普遍采用的过滤方法,以及存在的不足,但是每一种方法都不是十全十美的,只有通过不断的改进,才能逐步达到最优化设计。
本设计从水厂滤池控制系统要求的最低控制要求和控制工艺出发,设计出了基于PLC的水厂滤池控制系统,并且在滤池正常过滤的过程中,为了实现恒水位过滤,设计了以出水流量为控制参数的滤池液位PID控制系统。而在系统接收到反冲洗信号时,本系统在设计上就主控PLC如何更好的与现场PLC协调控制滤池的反冲洗方案进行了对比并且做了优化,增强了控制思路的清晰性,达到了预期的控制效果。根据系统的控制要求,进行了硬件设备的选型,设计了控制系统硬件配置图、I/O模块接线图,并编写了实现控制算法的程序。
关键词:水厂滤池,PLC,自动反冲洗,控制系统
The Application of PLC in Waterworks Control System
ABSTRACT

Water is the source of life, water supply natural relations to the people's livelihood important point, water supply that not only meets industrial water, and also to meet the water for living, agricultural water and so on, of which the most important is the water for living, each city medium small waterworks is the direct source of the life in the water, water quality term of not only affects the quality of the water, the more relationship to people's life safety, so the water in the water in term plays very important role, most of the water before viewing using artificial control, not only arduous, and the intensity of labor, labor efficiency is low, the water quality also is very difficult to guarantee, therefore, viewing of water automation reconstruction has put forward is very be necessary things.......
At the beginning of design, network from the current term of waterworks is generally used to filter method, and the deficiency, but each kind of method is not perfect, and only through continuous improvement, to gradually achieve the optimization design.
This design from viewing a water control system minimum control requirements and control technology of the design based on PLC control system of waterworks ponds, and in the process of viewing a normal filter, in order to realize constant water level filtering, designed for the