青岛理工大学毕业论文摘要本文通过对循环流化床的启动过程分析，为实现用可编程控制器（PLC）完成对此过程的自动控制，以安全启动和减轻人工负担为双目标，利用梯形图编写了PLC的控制程序。以240t/h锅炉为例，选取合适的模拟量输入模块，以达到基于对锅炉点火温度及炉膛温度实时监测下的安全启动过程。常规控制系统采用继电器控制，元器件较多，控制线路复杂，抗干扰能力差，增加了故障点，维护和维修不方便。而利用PLC程序对锅炉启动进行控制，不仅有效简化控制线路，提高系统的抗干扰能力。方便现场的维护和维修，又可以简化操作，并且可以充分保证点火成功率。关键词：循环流化床锅炉，可编程控制器，控制程序ABSTRACTBythestartofthecirculatingfluidizedbedprocessanalysis,toachievetheuseofprogrammablelogiccontroller(PLC)automaticcontrolofthecompletionofthisprocessinasafestart-upandreducethemanualburdenforthetwo-goal,theuseofthepreparationofthePLCladderdiagramcontrolprocedures.To240t/hboilerasanexample,selecttheappropriateanaloginputmodule,inordertoachievebasedontheboilerfurnaceignitiontemperatureandthetemperatureunderthereal-timemonitoringofthesafetyofthestartupprocess.Conventionalcontrolsystemtocontroltheuseofrelays,componentsaremorecomplexcontrolcircuit,pooranti-interferenceability,anincreaseofthepointoffailure,青岛理工大学毕业论文maintenanceandrepairisnotconvenient.ProceduresfortheuseofPLCcontroloftheboilertostart,notonlysimplifiesthecontrolcircuittoimprovethesystemofanti-interferenceability.Tofacilitatemaintenanceandrepairofthescene,butalsocansimplifytheoperation,andcanfullyguaranteethesuccessrateofignition.KEYWORDS：CFB,programmablelogiccontroller,controlprocedures2青岛理工大学毕业论文目录摘要...................................................................1ABSTRACT................................................................1目录前言..............................................................3前言...................................................................5第一章绪论............................................................61.2国内外发展现状.................................................61.3论文的主要工作.................................................7第二章PLC的特性分析...................................................82.1PLC应用背景....................................................82.2PLC控制系统设计简述[6]........................................102.2.1分析控制对象及确定控制内容................................102.2.2PLC机型选择...............................................112.2.3硬件设计...................................................112.2.4软件设计...................................................112.2.5系统统调...................................................122.3PLC控制系统的可靠性分析.........................................132.3.1影响现场输入给PLC信号出错的原因分析.......................132.3.2影响执行机构出错的原因分析.................................13第三章锅炉启动过程分析..............................................153.1锅炉启动前的准备..............................................163.1.1．锅炉本体的准备工作.......................................163.1.2．汽包内部装置安装施工质量检查.............................173.1.3．锅炉上水过程分析.........................................183.2锅炉的点火启动流程.............................................183.3启动流程图.....................................................21第四章锅炉停炉过程分析...........................................
