城市污水处理系统中（泵站）变频调速控制系统的设计（PLC+变频器方案）.docVIP

城市污水处理系统中（泵站）变频调速控制系统的设计（PLC+变频器方案） 摘 要 目前为止，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。 本文介绍了城市污水处理，并通过研究设计一套基于PLC控制的处理系统。文章首先介绍了基于PLC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、和信号采集等，最后按照工艺要求设计PLC控制系统污水处理PLC；变频器 The urban sewage treatment system (puming station) frequency conversion control system design(PLC+inver scheme) Abstract So far, our most sewage treatment control system automation level is not high, safety, efficiency, low improper management generally lower than the world standards. Sewage treatment system of aeration process control, data communication and monitoring management is the main problem solved urgently. China sewage disposal automation systems is relatively backward, sewage treatment cost remains high, wastewater treatment plant emissions of processed sewage water is not stable, so how to establish an effective control system, optimize the operation effect, to reduce the operation cost, to have the important meaning. This paper introduces the urban sewage treatment system in the flow of water, and through the study design a set of based on PLC control of constant pressure water processing system. This article first introduces the sewage treatment control system based on PLC technology and related processes, control system hardware structure and design, working principle and design PLC control system, the basic principles and steps of PLC in sewage disposal to illustrate the application process. According to requirements of the water system design of the electrical control equipment and automatic control circuit, mainly including equipment start-stop, state display, and signal acquisition, finally according to requirement of process design PLC control system. This design need 3 pump, its type, each machine 65LG36 cabin ac motor 7.5 KW, 380V. 3 pump all can achieve variab