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河南科技学院2009届本科毕业论文（设计）论文题目：基于PLC的水暖锅炉控制系统改造设计学生姓名：王雪斌所在院系：机电学院所学专业：应用电子技术教育导师姓名：刘法治完成时间：2009年05月20日摘要本文设计了一套基于PLC和变频调速技术的供暖锅炉控制系统。该控制系统由可编程控制器、变频器、鼓风机和水泵电机、传感器等构成。系统通过变频器控制电动机的启动、运行和调速。该设计以西门子S7-200系列可编程控制器为核心，一方面通过操作台与PLC通讯，接收管理者的控制命令。另一方面与各变频器进行通信，分别对鼓风机、循环泵和补水泵等进行启停控制和电机的转速设定，操作人员也随时可以通过操作台，了解现场每台锅炉的运行状况，对风机、水泵等电机进行启停控制。关键词：锅炉控制，变频器，PLC1ThedesignofheatingboilerautocontrolreformationsystembasedonPLCtechnologyAbstractInthisPaper,aheatingboilercontrolsystembasedonPLCandvariablefrequencySpeed-regulatingtechnologyisdesigned.ThecontrolsystemismadeupofPLC,transducers,electromotorunitsofPumpsandfans,sensors,etc.Itcancontrolelectromotorstarting,runningandtimingbymeansoftransducers.ThedesignisbasedonSiemensS7-200seriesprogrammablecontrollerasthecore;ontheonehandthroughtheconsoleitcancommunicatewiththePLC,toreceivecontrolcommandsfrommanagers.OntheotherhanditcommunicatewiththevariablefrequencySpeed-regulating,tofulfilledsuchasstartingandstoppingpumpmotorcontrolandspeedsettings,theoperatoratconsolecanfindoutatthesceneoftheoperationofeachboilertofans,pumpsandothermotorcontroltostartandstop.atanytime.Keywords：boilercontrol,variablefrequencySpeed-regulating,PLCtechnology目录1绪论...........................................................................................................................12供暖锅炉改造设计思路...........................................................................................12.1供暖锅炉改造设计要求.....................................................................................12.2锅炉系统的结构.................................................................................................22.3整体方案选择.....................................................................................................23变频调速在供暖锅炉控制中的应用.......................................................................33.1变频调速基本原理.............................................................................................33.2变频调速在供暖锅炉系统中的应用.................................................................44锅炉控制系统总体设计...........................................................................................44.1系统功能分析......................................................................................................44.2总体设计思路.....................................................................................................54.3系统结构.............................................................................................................55系统硬件设计...........................................................................................................65.1可编程控制器PLC的选型.................................................................................65.2PLC配置...............................................................................................................65.3I/O接线...............................................................................................................85.4变频器配置.........................................................................................................85.5传感器与变送器.................................................................................................95.5.1压力变送器工作原理................................................................................105.5.2压力变送器选型........................................................................................105.5.3温度传感器选型........................................................................................106系统构成.................................................................................................................116.1补水泵控制系统...............................................................................................116.2循环泵控制系统...............................................................................................136.3燃烧控制系统...................................................................................................157PID控制原理...........................................................................................................158程序设计.................................................................................................................188.1主程序设计.......................................................................................................158.2子程序设计.......................................................................................................159结束语.....................................................................................................................26致谢.............................................................................................................................25参考文献.....................................................................................................................2611绪论锅炉是供热设备中最普遍的动力设备之一，它的功能是把燃料中的贮能，通过燃烧转化成热能，以蒸汽或热水的形式输向各种设备。目前，大多数锅炉都是人工控制的，或简单的仪表单回路调节系统，燃料浪费很大。锅炉作为一个设备总体，有许多被控制量与控制量，许多参数之间明显地存在着复杂的关系。对于锅炉这个复杂的系统，由于其内部能量转换机理过于复杂，采用常规的方式进行控制，难以达到理想的控制效果，因此，必须采用智能控制方式控制，才能获得最佳控制效果。可编程逻辑控制器(PLC)既能代替传统的继电器接触器控制系统,又具有扩展各种输入输出模块,如A/D模块、热电偶热电阻模块,构成多功能控制系统。现代PLC集成度高