基于欧姆龙PLC的污水处理系统设计摘要目前,中国大多数污水处理控制系统自动化水平不高、安全性低,效率普遍低于世界标准,而且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.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.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.本系统设计的污水处理采用A2/O处理工艺,整个监控系统分为三部分:现场数据采集部分,完成数据采集功能；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；上位监控部分,主要监视现场各工艺流程运行状况并实施远程控制功能.本系统以OMRON公司的PLC作为数据采集及控制单元,配合各种检测仪表和控制设备对污水的液位、流量、pH值、温度及溶解氧浓度等控制量进行数据采集.同时,按照控制要求对各个现场设备如粗细格栅、提升泵、鼓风机等进行相应控制.根据工艺流程和控制要求设立了3个分布站,各站通过以太网与上位机相连.上位机通过组态王和各站进行数据交换,从而实现集中控制.关键词：污水处理,PLC,工艺流程AbstractAtpresent,themajorityofoursewagetreatmentcontrolsystemautomationlevelisnothigh,lowsecurity,efficiencyisgenerallylowerthantheworldstandard.Andhighcost,thequalityofsewagetreatmentisunstable.Inthesewagetreatmentsystem,theaerationprocesscontrol,datacommunicationsandmonitoringandmanagementarethemainissuesthatneedtoberesolved.Sohowtoestablisheffectiveautomaticcontrolsystemtooptimizetheoperatingresults,andreducesoperatingcostsisofgreatsignificance.ThesystemofsewagetreatmentplantusingtheA2/Oprocessingtechnology,thewholemonitoringsystemispidedintothreeparts:thefielddataacquisition,tocompletethedataacquisitionfunction;fieldcontrolunit,pidedintothecontrolcabinetandPLCstation,thecontrolcabinetismainlytocompletethemanualcontrol,PLCstationmainlycompletesthedataprocessing,automaticcontrolandcommunication;PCmonitoringsection,themainsurveillancesitetheprocessoperatingconditionsandtheimplementationofremotecontrolfunction.ThissystemusingOMRONPLCasthedatacollectionandcontrolunit,withavarietyofinstrumentationandcontrolequipmentforsewageliquidlevel,flowrate,pHvalue,temperatureanddissolvedoxygenconcentrationcontroldatacollection,atthesametime,inaccordancewiththerequirementsofthecontrolthefieldequipmentsuchasthicknessgrille,liftingpump,blowerandthecorrespondingcontrol.Thesystemaccordingtothetechnicalprocessandcontrolrequirementsfortheestablishmentof3distributionstations,eachstationthroughtheEthernetandthePCconnected.PCisusingKingviewtoexchangedatawitheachstation,thusrealizingthecentralizedcontrol.K