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兰州理工大学毕业设计说明书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原来越高的要求。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。该控制系统以一台工业控制机作为上位机，以西门子S7-300可编程控制机为下位机，系统通过变频器控制电机的启动，运行和调速。上位机监控采用WinCC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，并接受上位机的控制指令以完成风机启停控制，参数设定，循环泵的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。关键字：锅炉控制；变频调速；组态软件；PLC兰州理工大学毕业设计说明书1AbstractAlongwithsocialeconomy’sswiftdevelopment,theurbanconstructionscale’sunceasingexpansion,aswellasthepeplelivingstandard’sunceasingenhancement,setmoreandmorehighrequesttothecitylifeheating’suserquantityandtheheatingquality.Theunionpresentsituation,thepresentpaperheatingboilersupervisorysysem,hasdesignedasetbasedonPLCandthefrequencyconversionvelocitymodulationtechnologyheatingboilercontrolsystem.ThiscontrolsystemtakesthesuperiormachinebyoneIndustrycybertrons,westoffamilyhouseholdS7-300programmablecontrollerforlowerpositionmachine,systemthroughfrequencychangercontrolmotor’sstart,movementandvclocitymodulation.thesuperiormachinemonitoringsoftwareusesthethreedimensionalstrengthtocontroltheWinCCdesign,mainlycompletesthesystemoperationcontractsurfacedesign,realizesthesystemtoopen/stopsfunctionsandsooncontrol,parameterhypothesis,warninglinkage,historicaldatainquiry.ThelowerpositionmachinecontrolprocedureusesSiemen’sSTEP7programmingsoftwaredesign,mainlycompletesthesimulationquantitysignalprocessing,temperatureandpressuresignalfunctionsandsoonPIDcontrol,andreceivesthesuperiormachinecontrolcommandtocompletetheairblowertoopen/stopsthecontrol,theparameterhypothesis,thecirculatingpumpcontrolandotherelectricmotor’scontrol.Thisarticledesignsthefrequencyconversionprocesssautomaticcontrol,thesystemsoperationisstable,isreliable.Usesboiler’scomputercontrolandthefrequencyconverseoncontrolnoeonlymaysavetheenergygreatly,thepromotionenvironmentalprotectionmoreovermayraisetheproductionautomationlevel,hastheremarkableeconomicefficiencyandthesocialefficiency.KeyWords：Boilercontrol；Frequencyconversionvelocitymodulation；ConfigurationSoftware；PLC兰州理工大学毕业设计说明书2目录摘要................................................................................................................................0Abstract.........................................................................................................................1第1章概述..........................................................................................................41.1项目背景及课题的研究意义............................................................................................41.2供暖锅炉控制的国内外研究现状....................................................................................51.3锅炉控制系统的发展趋势.................................................................................................61.4本文所做工作.....................................................................................................................7第2章系统方案设计..................................................................................................92.1锅炉控制研究简介.............................................................................................................92.2总体设计思路....................................................................................................................92.3方案比较...........................................................................................................................102.3.1方案1.....................................................................................................................102.3.2方案2....................................................................................................................102.4方案论证与方案确定.......................................................................................................11第3章硬件设计........................................................................................................123.1用户系统框图..................................................................................................................123.2锅炉系统的理论分析......................................................................................................133.2.1变频调速基本原理................................................................................................133.2.2变频调速在供暖锅炉中的应用............................................................................133.2.3变频调速节能分析................................................................................................143.3燃烧过程控制...................................................................................................................193.4锅炉控制系统设计...........................................................................................................203.5控制系统构成介绍...........................................................................................................21第4章软件设计........................................................................................................254.1S7-300系列PLC简介.................