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图书分类号：密级：基于PLC的锅炉加热温度控制系统设计DESIGNOFBOILERTEMPERATURECONTROLSYSTEM学生学号学生姓名学院名称专业名称指导教师I摘要本文主要介绍了工业温度控制的发展前景、S7-200系列PLC的基本知识以及锅炉温度控制系统的工作流程、基本原理和组成结构。通过对锅炉温度控制系统设计要求的分析，给出锅炉温度控制系统的I/O口分配表和系统原理图并且以可编程控制器(PLC)为核心，根据系统的控制要求利用STEP7编程软件设计系统的梯形图。该系统以电热锅炉加热管为被控对象，锅炉水温为被控参数同时兼顾锅炉内压力及水位等条件，以PLC为控制器，锅炉加热管通电时间为控制参数设计了一个温度控制系统。其中调用了西门子公司PLC中自带的PID模块，以更简洁更方便的方法完成了锅炉温度的自动控制设计。本文从系统的工作原理、系统硬件选型、系统软件编程以及组态监控画面设计等方面进行阐述。关键词电热锅炉；温度控制；PLC；PID；固态继电器IIAbstractThisarticlefocusesontheindustrialdevelopmentprospectsoftemperaturecontrol,basicknowledgeofS7-200seriesPLCaswellastheboilertemperaturecontrolsystemmadeupofworkprocesses,principles,andstructure.Throughtheanalysisofboilertemperaturecontrolsystemdesign,I/Oportallocationtableoftemperaturecontrolsystemoftheboiler,systemschematicsandaprogrammablelogiccontroller(PLC)asthecore,accordingtothecontrolsystemrequirestheuseofSTEP7programmingsoftwaresystemdesignofladderdiagram.Thesystemtoelectricboilerheatingtubestoachargedobject,parametersofboilerwatertemperaturetobecontrolledboththepressureandthewaterlevelintheboilerandotherconditions,thePLCcontroller,boilerheatingpowerparameterdesignofatemperaturecontrolsystemforcontrol.WhichiscalledtheSiemensPLCcomeswithPIDmodules,andamoreconciseandmoreconvenientwaytocompletetheautomaticcontrolsystemdesignoftheboilertemperature.Thispaperdescribedtheworkingprincipleofthesystem,systemhardwareselection,systemsoftwareprogrammingandconfigurationofthemonitorscreendesign.KeywordsElectricboilerTemperaturecontrolPLCPIDSolidStateRelaysI目录1绪论.............................................................................................................................................11.1课题背景及意义..................................................................................................................11.2国内外研究现状..................................................................................................................11.3本文研究内容......................................................................................................................22温度控制系统设计.....................................................................................................................32.1温度控制系统工作原理......................................................................................................32.2PID控制及参数整定..........................................................................................................32.2.1PID控制原理................................................................................................................32.2.2PID参数的整定...........................................................................................................43系统硬件设计.............................................................................................................................73.1PLC的产生和特点..............................................................................................................73.1.1PLC的产生与应用.......................................................................................................73.1.2PLC的特点...................................................................................................................73.2PLC控制系统设计的基本原则和步骤..............................................................................73.2.1PLC控制系统设计的基本原则...................................................................................83.2.2PLC控制系统设计的一般步骤...................................................................................83.3系统整体设计方案..............................................................................................................93.4PLC选型..............................................................................................................................93.4.1PLC的主机模块...........................................................................................................93.4.2PLC的I/O扩展模块.................................................................................................103.4.3PLC的选择.................................................................................................................103.5传感器选型........................................................................................................................103.5.1温度传感器选型.........................................................................................................103.5.2PT100温度变送器选型.............................................................................................113.5.3压力传感器选型.........................................................................................................113.5.4液位传感器选型.........................................................................................................113.6固态继电器........................................................................................................................123.6.1固态继电器的原理分析.............................................................................................123.6.2固态继电器的组成...................................................................................