基于PLC控制的污水处理系统毕业设计

河南理工大学毕业设计（论文）I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工艺流程河南理工大学毕业设计（论文）IIAbstractAtpresent,themajorityofoursewagetreatmentcontrolsystemautomationlevelisnothigh,lowsecurity,mismanagement,efficiencyisgenerallylowerthantheworldstandard.Sewagetreatmentsystemintheaerationprocesscontrol,datacommunicationsandmonitoringandmanagementarethemainissuesthatneedtoberesolved.Chinasewagetreatmentautomaticcontrolsystemisrelativelybackward,thehighcostofsewagetreatment,sewageplant'streatedeffluentqualityofinstability,howtoestablisheffectiveautomaticcontrolsystemtooptimizetheoperatingresults,andreduceoperatingcostsisofgreatsignificance.Thispaperintroducesthebasictechniquesandprocessesofplantsewagetreatment,andasewagetreatmentsystembasedonPLCcontrolstudydesign.ThearticlefirstintroducesthePLC-basedsewagetreatmentprocessandrelatedprocesscontrolsystem,controlsystemhardwarearchitectureanddesign,operatingprinciplesandthebasicprinciplesofthedesignofPLCcontrolsystemandthestepstoillustratetheapplicationofPLCinthesewagetreatmentprocess.Firstdesignofelectricalcontrolandautomaticcontrolcircuitaccordingtothesewagetreatmentrequirements,includingstartandstopequipment,statussignalfaultsignal,andsignalacquisition,thefinaldesignofPLCcontrolsysteminaccordancewiththeprocessrequirements,includingtheselectionofthePLC,thesystemallocationofresources,aswellasthepreparationofthePLCprograminaccordancewiththesewagetreatmentprocess.Keywords:sewagetreatmentthePLCprocess河南理工大学毕业设计（论文）III目录1绪论......................................................................................................................................11.1课题的背景.......................................................................................................................11.2工业污水处理的国内外现状...........................................................................................21.3课题主要设计的内容.......................................................................................................32工业污水处理控制系统总体介绍........................................................................................42.1工业污水处理基本概念...................................................................................................42.2常用的工业污水处理工艺..............................................................................................42.3本设计系统工业污水处理工艺及描述...........................................................................92.4工业污水处理系统控制形式.........................................................................................102.5工业污水处理系统的功能要求.....................................................................................112.5.1信号输入..................................................................................................................112.5.2控制输出信号..........................................................................................................123硬件系统配置......................................................................................................................133.1主要组成部分.................................................................................................................133.2电气控制系统.................................................................................................................143.3工业污水处理系统的工作原理.....................................................................................153.3.1控制系统总体框图..................................................................................................153.3.2工作过程..................................................................................................................153.3.3工业污水处理系统主电路设计..............................................................................163.4PLC的选型...............................................................................................................163.4.1PLC的选择.........................................................................................................163.4.2S7-200PLC概述.....................................................................................................173.5PLC的I/O资源配置.....................................................................................................183.5.1数字量输入部分......................................................................................................183.5.2数字量输出部分......................................................................................................183.5.3模拟量输入部分......................................................................................................193.5.4模拟量输出部分...................................................................................................193.6其他资源配置...............................................