基于PLC污水处理控制系统的毕业设计（机械CAD图纸）.doc

本科机械毕业设计论文 CAD 图纸 QQ 401339828 摘要如今,我低、安全性不高、管理不当,效率明显低于世界标准。污水处理系统中的曝气过程控制、数据通讯和监控管理这些问题是急需要解决的。中国污水处理自控系统比较落后,污水处理成本高,污水厂排放处理过的污水水质不稳定,所以如何建立良好有效的自控系统,提高运行效果,降低运行费用,具有非常重要的意义。本文介绍了工厂污水处理的基本工艺流程,并进行研究设计一种基于 PLC 控制的污水处理方案。文章最先描述了基于 PLC 污水处理控制系统的相关工艺及流程,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,从而说明 PLC 在污水处理过程中的应用。然后依据污水处理要求设计设备的电器控制与自动控制线路,主要包括设备的启停、状态故障信号和信号的采集等,最后按照工艺要求设计 PLC 控制系统,其中包括 PLC 的选型、系统资源配置和根据污水处理工艺编制 PLC 程序。关键词: 污水处理; PLC ;工艺流程 3 本科机械毕业设计论文 CAD 图纸 QQ 401339828 Abstract Today, the majority ofour sewage treatment control system low level of automation , security isnot high , mismanagement, the efficiency lower than the standard markedly . Sewage disposal system in the aeration process control, munications and monitoring and management of these problems are urgently needed tobe addressed . Sewage treatment automatic control system in China is relatively backward , the high cost of sewage treatment , wastewater treatment plant discharge treated effluent quality isnot stable , sohow to create a good and effective automatic control system , improve operating results , lower operating costs , has a very important significance . This article describes the basic process of the plant sewage treatment and research to design a wastewater treatment program based on PLC control . The article first described the sewage treatment control system based on PLC technology and processes , the basic principles and steps of the control system hardware architecture and design , working principle and design of PLC control system , which can show that the application of PLC in the sewage treatment process . Requirements of the Sewage design electrical control equipment and automatic control circuit , including the start and stop , the status fault signal and signal acquisition , the final design of PLC control system in accordance with the process requirements , including the PLC selection, system resource allocation PLC program and the preparation of the sewage tre