基于PLC控制的污水处理系统毕业论文_说明书.doc

word文档整理分享 PAGE 参考资料 word文档整理分享 参考资料 摘要 目前，我国大多数污水处理控制系统自动化水平不高、安全性低、管理不当，效率普遍低于世界标准。污水处理系统中的曝气过程控制、数据通讯和监控管理是急需解决的主要问题。中国污水处理自控系统相对落后，污水处理成本居高不下，污水厂排放的处理过的污水的水质不稳定，所以如何建立有效的自控系统、优化运行效果、减少运行费用，具有重要意义。 本文介绍了工厂污水处理的基本工艺和流程，并通过研究设计一套基于PLC控制的污水处理系统。文章首先介绍PLC在污水处理控制系统的工艺及相关流程，控制系统硬件结构及设计、工作原理以及设计PLC控制系统的基本原则和步骤，来说明PLC在污水处理过程中的应用。先根据污水处理要求设计了设备的电器控制与自动控制线路，主要包括设备的启停、状态信号、故障信号、和信号采集等，最后按照工艺要求设计PLC控制系统，其中包括PLC的选型、系统资源配置以及按照污水处理工艺编制PLC程序。 关键词：污水处理 PLC 工艺流程  Abstract At present, the majority of our sewage treatment control system automation level is not high, low security, mismanagement, efficiency is generally lower than the world standard.Sewage treatment system in the aeration process control, data communications and monitoring and management are the main issues that need to be resolved. China sewage treatment automatic control system is relatively backward, the high cost of sewage treatment, sewage plants treated effluent quality of instability, how to establish effective automatic control system to optimize the operating results, and reduce operating costs is of great significance. This paper introduces the basic techniques and processes of plant sewage treatment, and a sewage treatment system based on PLC control study design. The article first introduces the PLC-based sewage treatment process and related process control system, control system hardware architecture and design, operating principles and the basic principles of the design of PLC control system and the steps to illustrate the application of PLC in the sewage treatment process. First design of electrical control and automatic control circuit according to the sewage treatment requirements, including start and stop equipment, status signal fault signal, and signal acquisition, the final design of PLC control system in accordance with the process requirements, including the selection of the PLC, the system allocation of resources, as well as the preparation of the PLC