基于PLC的污水处理自动控制系统设计

发布时间：2018-05-01 21:55

本文选题：污水处理工艺 + PLC　；参考：《湖南大学》2014年硕士论文

【摘要】：水资源、水环境是人类生存的基础。随着国家城市化、工业化的快速发展，大量生活废水和工业废水的排放,导致了我国现有水源水质急剧下降，水体污染日益严重。为了保证我国经济的可持续发展，污水处理已经成为城市建设中不可缺少的配套措施。近年来，随着人们对水环境保护的关注和需求不断增强，污水处理过程自动化程度的不断提高，大量的先进控制技术和设备被运用到了对污水处理过程来，为了提高污水处理的效率以及经济效益，设计一套有效的监控系统十分必要。论文以霍利威尔公司的Allen-Bradley品牌PLC作为平台，通过一个现实的工程案例，介绍了PLC控制系统在污水治理工艺中的应用。在平台中，以PLC为控制器，结合各种在线仪表，完成对污水水质（如：PH值、COD值）的检测，根据污水处理过程的特点以及设备控制要求完成了对现场设备的控制；工作人员通过监控系统可以在远程控制模式下实现对污水厂的监控，同时系统还设计报表功能，供工作人员后期分析。一般来说，污水处理过程存在大时滞、非线性、强干扰等特点，很难对污水处理过程建立精确模型进行控制。本案例通过分析污水处理过程机理，同时根据实际应用中的污水处理的各工艺环节设计了污水处理控制系统的整体的DCS结构及通讯网络层次，并对重点的工艺处理环节有详细的程序及控制说明。设计的污水处理自控系统可以通过中央监控系统的管理层和PLC控制站的现场层实现完整的污水处理过程,并完成整个污水处理厂全工艺流程的监控和调度管理;在控制效果上，，精确性、便捷性、兼容性这几方面都得以实现并达到了预期的目标。因此，本文对污水处理控制系统有一定的现实意义。
[Abstract]:Water resources, water environment is the basis of human survival. With the rapid development of urbanization and industrialization, a large number of domestic wastewater and industrial wastewater discharge, resulting in a sharp decline in the existing water quality, water pollution is becoming more and more serious. In order to ensure the sustainable development of China's economy, sewage treatment has become an indispensable supporting measure in urban construction. In recent years, with the increasing attention and demand for water environment protection and the increasing degree of automation of sewage treatment process, a large number of advanced control technologies and equipment have been applied to wastewater treatment process. In order to improve the efficiency and economic benefit of sewage treatment, it is necessary to design an effective monitoring system. This paper takes Allen-Bradley brand PLC of Holywell Company as the platform, and introduces the application of PLC control system in sewage treatment process through a practical engineering case. In the platform, PLC is used as controller, combined with various on-line instruments, to complete the detection of wastewater quality (such as the value of PLC). According to the characteristics of sewage treatment process and the requirements of equipment control, the control of field equipment is completed. The staff can monitor and control the sewage plant in the remote control mode through the monitoring system. At the same time, the system also designs the report form function for the staff to analyze in the later stage. Generally speaking, the process of sewage treatment has the characteristics of large delay, nonlinear and strong disturbance, so it is difficult to establish an accurate model for the process of sewage treatment. Through analyzing the mechanism of sewage treatment process, the paper designs the whole DCS structure and communication network level of sewage treatment control system according to the process of sewage treatment in practice. And the key process process has detailed procedures and control instructions. The designed sewage treatment automatic control system can realize the complete sewage treatment process through the management of the central monitoring system and the field layer of the PLC control station, and complete the monitoring and dispatching management of the whole process flow of the sewage treatment plant. Accuracy, convenience and compatibility have been achieved and the desired goals have been achieved. Therefore, this paper has certain realistic significance to the sewage treatment control system.
【学位授予单位】：湖南大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：X703;TP273

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