基于plc设计出的水厂滤池自动控制系统设计 大学毕设论文.doc

摘要供水是一个关系国计民生的重要产业。供水不仅要满足管网压力的需要、保证充足供水,还要求水质明显提高。滤池是水厂常规处理净水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。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。本文从水厂滤池自动控制系统的控制要求和工艺特点出发,设计出了一套基于 ControlLogix 硬件和软件系统的水厂滤池自动控制系统。在滤池正常过滤时,为实现恒水位过滤,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 PL C如何更好的与现场 PL C 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,恒水位 PID 控制,自动反冲洗,协调控制山东科技大学学士学位论文 ABSTRACT ABSTRACT Water supply is an important industry for the people's livelihood. Not only to meet the needs of the work pressure and to ensure adequate water supply, but also called for the improvement of water quality. As to conventional water treatment plant, filter is the last structures of water purification processes, filter run a direct impact on water quality. The process of filter backwash plexity, if still used in manually, labor-intensive, low productivity, so it is difficult to ensure the safety of this system and it must be transformed to automatic systems. In this paper, asa view of the automatic control system for the water plant filter requirements and process characteristics, the automatic control system for the water plant design ofa set of hardware and software based on the ControlLogix system has been plished. When in the normal filtrate period, in order to keep the constant level, designed the PID filter level control system which is based on the water flow parameters. When receives backwashing signals, the control system onhow to enhance coordination between master PLC and on-site PLC, has pared and optimized. According to requirements of the designed control system, the selection of hardware devices, hardware configuration, I/O module wiring diagram, procedures for the realization of control algorithm have been plished. Keyword s: water plant filter , constant water level on PID control , automatic backwashing , coordinated control 山东科技大学学士学位论文目录目录 1 绪论........................................