基于PLC的污水处理系统毕业论文设计

河南科技学院2011届本科毕业论文（设计）论文题目：基于PLC的SBR污水处理系统学生姓名：郭林强所在院系：机电学院所学专业：应用电子技术教育导师姓名：杨宾峰完成时间：2011年5月17日摘要随着我国经济的快速发展和人民生活水平的提高，水环境的污染问题日益严重。全国许多小城镇没有污水处理设施，这不仅污染了当地水环境，影响了居民的身体健康，而且严重阻碍了经济的发展。序批式活性污泥法（简称SBR)符合中小城镇污水处理的基本要求，水处理工艺简洁易行，占地少，布局紧凑合理，节省投资，是一种先进的污水处理系统。可编程控制器是专为工业环境应用而设计的工业自动控制装置，在污水处理系统中采用PLC控制系统，可以减轻工人的劳动强度,提高污水处理的运行效率,提高自动控制的可靠性。关键词：可编程控制器，序批式活性污泥法，污水处理，自动控制DesignofSewageTreatmentSystemControlledbyPLCWiththerapiddevelopmentofcommunityeconomic&technologyandtheconstantimprovementoftheleveloflivinginourcountry,thepollutionofwaterbecomesmoreandmoreserious.thesewagecomefromindustryandtownlivingincreasecontinuously,butthecity’sequipmentswhichareusedtodrainsewageanddisposesewageareinsufficientandsomeharmfulsubstancewhichbenotdisposedweredirectlyorindirectlypourintotheriver,thenarosewaterpollutionandappeartotheproblemabouttheaquaticenvironment’spollution.WhilePLChasseriesofmeritssuchas:maturetechnique,fineuniversalproperty,highreliability,flexibletoinstall,convenienttoexpand,excellentcostperformance,etc,whichhaveenableditgainamoreandmorewidespreadapplicationinindustrialcontrol.Thispaperwillmainlyintroducethecompositionandfunctionoftheautomaticcontrolsysteminsewagetreatmentplantsandseveralproblemsthatmayoccurinthepracticaluseofthesystemandthepossiblesolutionstothem.SincethetransformationbyemployingPLCcontrolsysteminsewagetreatment,thereliabilityofautomaticcontrolhasbeenadvanced,whichhasnotonlyreducedworkers’workintensity,butalsoimprovedtheoperationalefficiencyofthesewagetreatmentplants,thushasmadethereliableadministrationofmanufacturinginsewagetreatmentplantspossible.Keywords:PLC,Sewagetreatment,SBRreaction目录1绪论............................................................................................................................42系统总体设计............................................................................................................43控制系统设计.............................................................................................................53.1格栅除污系统..................................................................................................53.1.1转鼓格栅除污机特点.............................................................................53.1.2转鼓格栅除污机工作原理.....................................................................63.1.3性能参数选择.........................................................................................63.2调节池..............................................................................................................73.3SBR反应池......................................................................................................73.3.1SBR工艺简介........................................................................................73.3.2曝气系统................................................................................................83.4排水系统..........................................................................................................93.4系统所需设备仪表........................................................................................103.3.3参量的选择与测量..............................................................................114控制系统设计..........................................................................................................114.1PLC选型........................................................................................................114.2SBR控制系统流程图....................................................................................124.3PLC的I/O口分配.........................................................................................124.4软件设计........................................................................................................134.5系统外部接线图............................................................................................145上位机与下位机的设计..........................................................................................145.1上位机设计....................................................................................................145.2下位机设计....................................................................................................155.3上位机与下位机之间的通信........................................................................155.3.1PLC的通信功能..................................................................................155.3.2PLC的通信协议..................................................................................166通讯网络..................................................................................................................186.1中央控制室....................................................................................................186.2控制分站........................................................................................................196.3现场监测仪表.................................................................................................197结束语......................................................................................................................20致谢.............................................