污水处理厂自动化监控系统设计

1污水处理厂自动化监控系统设计摘要随着人民生活水平的提高和可持续发展战略的需要，污水处理越来越受到社会的重视。污水处理既可以起到环保作用，又可以实现水的重复利用，节约水资源。为了提高污水处理的质量和效率，同时节省人力、物力，设计一套自动化监控系统是十分必要的。本文介绍了中小型污水处理厂自动化监控系统的整体设计方案。本污水处理厂设计采用倒置A²/O处理工艺，设计处理污水规模为4万吨/天。整个监控系统分为三部分：一是现场数据采集部分，完成数据采集功能；二是现场控制单元，分现场控制柜和PLC站，现场控制柜主要完成手动控制，PLC站主要完成数据处理、自动控制及通讯功能；三是上位机监控部分，主要监视现场各工艺流程运行状况并实施远程控制功能。本文以工艺流程为线索，介绍了系统的总体设计方案、各PLC站的设计、重要参数的监测、通信网络和上位机监控界面的开发。关键字：可编程逻辑控制器,自动化控制,组态软件2AbstractWiththeimprovementoflivingstandardsandtheneedsofsustainabledevelopment,sewagetreatmenthasarousedmuchattentionofthesociety.Itcanplayaroleinenvironmentalprotection,andCandealwithwaterreusetoconservewaterresources.Inordertoimprovethequalityandefficiencyofsewagetreatment，andsavemanpowerandrawmaterials,designinganautomaticmonitoringsystemisverynecessary.ThisthesisintroducingtheoveralldesignplanofmiddleandsmallscaleSewagetreatmentplants’automaticmonitoringsystems.SewagetreatmentplantusesinvertA²/Oprocessingtechniqueandconductssewagetreatment40,000tonsperday.Thewholesupervisorysystemconsistsofthreeparts.Thefirstpartisfielddatacollection,whichcompletesthedataacquisitionfunction.Thesecondpartisscenecontrolunit.Itisdividedintotwoparts-scenecontrolcubicleandthePLCstation.Scenecontrolcubiclemainlycompletesthetaskofhandcontrol;PLCstandsmainlycompetesthetasksofdataprocessing,automaticcontrolandcommunication.Thethirdpartissuperiormonitoring.Themainfunctionofitistomonitortheoperationofvarioustechnicalprocessesandimplementremotecontrol.Thisthesisintroducedtheoverallprojectdesign,thedesignofeachPLCstation,themonitorofkeyparameter,thesequenceoftechnicalprocess,communicationnetworkandPCmonitoringsoftware.3Keywords:ProgrammableLogicalController,AutomaticsControl,SoftPanel.目录1绪论..............................................................................................................................................................11.1污水处理国内外发展现状.....................................................................................................11.2课题的意义及背景.................................................................................................................21.3课题的研究内容.....................................................................................................................31.4章节安排................................................................................................................................42工艺流程介绍............................................................................................................................................52.1污水处理指标........................................................................................................................52.2污水处理的基本工艺方法....................................................................................................72.3本系统采用的工艺介绍........................................................................................................72.3.1倒置A²/O工艺介绍.....................................................................................................82.3.2本系统工艺流程...........................................................................................................93控制系统方案设计.................................................................................................................................103.1污水处理自控系统的难点..................................................................................................103.2设计原则..............................................................................................................................113..3设计思想.............................................................................................................................113.4系统构成..............................................................................................................................1243.4.1系统结构图.................................................................................................................123.4.2各单元功能描述.........................................................................................................124控制系统硬件设计.................................................................................................................................144.1仪表系统..............................................................................................................................144.1.1仪表的选型原则.........................................................................................................144.1.2本系统主要仪表.........................................................................................................154.2PLC01站设计.......................................................................................................................154.2.1粗格栅.........................................................................................................................154.2.2提升泵房.....................................................................................................................164.2.3细格栅.......................................................................................