摘要供水是一个关系国计民生的重要产业。供水不仅要满足管网压力的需要、保证充足供水，还要求水质明显提高。滤池是水厂常规处理净水构筑物的最后一道工序，滤池运行的好坏直接影响到水厂的出水水质。滤池反冲洗工艺复杂，如果仍然沿用人工方式，劳动强度大，工作效率低，安全性难以保障，为此必须进行滤池自动化系统的改造。本文从水厂滤池自动控制系统的控制要求和工艺特点出发，设计出了一套基于ControlLogix硬件和软件系统的水厂滤池自动控制系统。在滤池正常过滤时，为实现恒水位过滤，设计了以出水流量为控制参数的滤池液位PID控制系统。而在系统接收到反冲洗信号时，本系统在设计上就主控PLC如何更好的与现场PLC协调控制滤池的反冲洗方案进行了对比并且做了优化，增强了控制思路的清晰性，达到了预期的控制效果。根据系统的控制要求，进行了硬件设备的选型，设计了控制系统硬件配置图、I/O模块接线图，并编写了实现控制算法的程序。关键词：水厂滤池，恒水位PID控制，自动反冲洗，协调控制ABSTRACTWatersupplyisanimportantindustryforthepeople'slivelihood.Notonlytomeettheneedsofthepipelinenetworkpressureandtoensureadequatewatersupply,butalsocalledfortheimprovementofwaterquality.Astoconventionalwatertreatmentplant,filteristhelaststructuresofwaterpurificationprocesses,filterrunadirectimpactonwaterquality.Theprocessoffilterbackwashiscomplexity,ifstillusedinmanually,labor-intensive,lowproductivity,soitisdifficulttoensurethesafetyofthissystemanditmustbetransformedtoautomaticsystems.Inthispaper,asaviewoftheautomaticcontrolsystemforthewaterplantfilterrequirementsandprocesscharacteristics,theautomaticcontrolsystemforthewaterplantdesignofasetofhardwareandsoftwarebasedontheControlLogixsystemhasbeenaccomplished.Wheninthenormalfiltrateperiod,inordertokeeptheconstantlevel,designedthePIDfilterlevelcontrolsystemwhichisbasedonthewaterflowparameters.Whenreceivesbackwashingsignals,thecontrolsystemonhowtoenhancecoordinationbetweenmasterPLCandon-sitePLC,hasbeencomparedandoptimized.Accordingtorequirementsofthedesignedcontrolsystem,theselectionofhardwaredevices,hardwareconfiguration,I/Omodulewiringdiagram,proceduresfortherealizationofcontrolalgorithmhavebeenaccomplished.Keywords:waterplantfilter,constantwaterlevelonPIDcontrol,automaticbackwashing,coordinatedcontrol目录1绪论..................................................................................................11．1课题研究背景..........................................................................................11.2课题研究内容.............................................................................................21.3研究的目的和意义.....................................................................................52控制系统总体方案的设计.............................................................72.1系统分析.....................................................................................................72.2系统总体方案的设计...............................................................................123控制系统的硬件设计...................................................................273.1滤池实现自动控制所需的设备...............................................................273.2传感器和执行器的选择...........................................................................333.3系统的硬件配置及I/O连接图................................................................393.4控制参数整定...........................................................................................434系统的...
