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1、摘要随着社会经济的飞速发展,城市建设规模的不断扩大,以及人们生活水平的不断提高,对城市生活供暖的用户数量和供暖质量提出了越来越高的要求。结合现状,本论文供暖锅炉监控系统,设计了一套基于PLC和变频调速技术的供暖锅炉控制系统。该控制系统以两台工业控制机作为上位机,以西门子S7-300可编程控制器为下位机,系统通过变频器控制电动机的启动、运行和调速。上位机监控软件采用三维力控PCAuto3.6设计,主要完成系统操作界面设计,实现系统启/停控制、参数设定、报警联动、历史数据查询等功能。下位机控制程序采用西门子公司的STEP7编程软件设计,主要完
2、成模拟量信号的处理,温度和压力信号的PID控制等功能,并接收上位机的控制指令以完成风机启/停控制、参数设定、循环泵控制和其余电动机的控制。本文设计的变频控制系统实现了锅炉燃烧过程的自动控制,系统运行稳定、可靠。采用锅炉的计算机控制和变频控制不仅可大大节约能源,促进环保,而且可以提高生产自动化水平,具有显著的经济效益和社会效益。关键词:锅炉控制;变频调速技术;PLC;组态软件AbstractAlongwithsocialeconomy'sswiftdevelopment,theurbanconstructionscale'sunceasin
3、gexpansion,aswellasthepeoplelivingstandard'sunceasingenhancement,setmoreandmorehighrequesttothecitylifeheating'suserquantityandtheheatingquality.Theunionpresentsituation,thepresentpaperheatingboilersupervisorysystem,hasdesignedasetbasedonPLCandthefrequencyconversionveloci
4、tymodulationtechnologyheatingboilercontrolsystem.Thiscontrolsystemtakesthesuperiormachinebytwoindustrycybertrons,westoffamilyhouseholdS7-300programmablecontrollerforlowerpositionmachine,systemthroughfrequencychangercontrolmotor'sstart,movementandvelocitymodulation.Thesupe
5、riormachinemonitoringsoftwareusesthethreedimensionalstrengthtocontrolthePCAuto3.6design,mainlycompletesthesystemoperationcontactsurfacedesign,realizesthesystemtoopen/stopsfunctionsandsooncontrol,parameterhypothesis,warninglinkage,historicaldatainquiry.Thelowerpositionmach
6、inecontrolprocedureusesSiemens'sSTEP7programmingsoftwaredesign,mainlycompletesthesimulationquantitysignalprocessing,temperatureandpressuresignalfunctionsandsoonPIDcontrol,andreceivesthesuperiormachinecontrolcommandtocompletetheairblowertoopen/stopsthecontrol,theparameterh
7、ypothesis,thecirculatingpumpcontrolandotherelectricmotor'scontrol.Thisarticledesignsthefrequencyconversioncontrolsystemhasrealizedtheboilercombustionprocessautomaticcontrol,thesystemsoperationisstable,isreliable.Usesboiler'scomputercontrolandthefrequencyconversioncontroln
8、otonlymaysavetheenergygreatly,thepromotionenvironmentalprotection,moreovermayraisetheproductiona