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长春工业大学人文信息学院毕业设计（论文）姓名李蔚学号10092212题目基于PLC的锅炉温度控制系统系别自动化系专业电气工程及其自动化班级100922指导教师李晶完成日期2014年3月*日摘要从上世纪80年代至90年代中期，PLC得到了快速的发展，在这时期，PLC在处理模拟量能力、数字运算能力、人机接口能力和网络能力得到大幅度提高，PLC逐渐进入过程控制领域，在某些应用上取代了在过程控制领域处于统治地位的DCS系统。PLC具有通用性强、使用方便、适应面广、可靠性高、抗干扰能力强、编程简单等特点。PLC在工业自动化控制特别是顺序控制中的地位，在可预见的将来，是无法取代的。本文介绍了以锅炉为被控对象，以锅炉出口水温为主被控参数，以炉膛内水温为副被控参数，以加热炉电阻丝电压为控制参数，以PLC为控制器，构成锅炉温度串级控制系统；采用PID算法，运用PLC梯形图编程语言进行编程，实现锅炉温度的自动控制。电热锅炉的应用领域相当广泛，在相当多的领域里，电热锅炉的性能优劣决定了产品的质量好坏。目前电热锅炉的控制系统大都采用以微处理器为核心的计算机控制技术，既提高设备的自动化程度又提高设备的控制精度。本文分别就电热锅炉的控制系统工作原理，温度变送器的选型、PLC配置、组态软件程序设计等几方面进行阐述。通过改造电热锅炉的控制系统具有响应快、稳定性好、可靠性高,控制精度好等特点，对工业控制有现实意义。关键词：电热锅炉的控制系统温度控制串级控制PLCPIDAbstractFromthelastcenturyto90inthemid80's,PLChasbeenrapiddevelopmentinthisperiod,PLCcapabilityindealingwithanaloganddigitalcomputingpower,man-machineinterfacecapabilitiesandnetworkcapabilitiesaregreatlyimproved,PLCgraduallyenteringthefieldofprocesscontrol,replacedinsomeapplicationsinthefieldofprocesscontroldominantDCS.PLChastheversatility,easeofuse,wideadaptation,highreliabilityandstronganti-interference,simpletoprogramandsoon.PLCcontrol,especiallyintheindustrialautomationsequencecontroltheposition,intheforeseeablefuture,isnosubstitute.ThispaperintroducestheboilerasthechargedobjecttotheboilerwatertemperatureofthemainaccusedoftheexportparameterstofurnacetemperatureasdeputyaccusedofparameterstocontroltheheatingresistancewirevoltageparameterstoPLC,controller,constitutesaseriesofboilertemperaturelevelcontrolsystem;usingPIDalgorithm,theuseofPLCladderprogramminglanguage,programming,boilertemperaturecontrol.Electricboilersawiderangeofapplications,inaconsiderablenumberoffield,theelectricboilerperformanceadvantagesanddisadvantagesofthedecisionThequalityoftheproduct.Electricboilercontrolsystemscurrentlyusedmostlyforcomputercontrolmicroprocessorcoretechnology,bothtoimprovetheautomationequipmenthaveimprovedthecontrolprecisionequipment.Thispaperontheheatingboilercontrolsystemworks,selectionoftemperaturetransmitter,PLCconfigurations,theconfigurationsoftwaredesignaspectsweredescribed.Throughthetransformationofelectricboilercontrolsystemhasfastresponse,goodstability,highreliability,controlaccuracyandgoodfeatures,practicalsignificanceforindustrialcontrol.Keywords:heatingboilercontrolsystemtemperaturecontrolcascadecontrolPLCPI目录摘要........................................................................................................................................IIABSTRACT..................................................................................................................................III1.1课题背景及研究目的和意义...................................................................................-1-1.2国内外研究现状......................................................................................................-1-1.3项目研究内容..........................................................................................................-2-第二章PLC和组态软件基础.....................................................................................-3-2.1可编程控制器基础...................................................................................................-3-2.1.1可编程控制器的产生和应用............................................................................-3-2.1.2可编程控制器的组成和工作原理....................................................................-4-2.1.3可编程控制器的分类及特点............................................................................-6-2.2组态软件的基础.......................................................................................................-7-2.2.1组态的定义........................................................................................................-7-2.2.2组态王软件的特点............................................................................................-7-2.2.3组态王软件仿真的基本方法............................................................................-8-第三章PLC控制系统的硬件设计.................................................................................-8-3.1PLC控制系统设计的基本原则和步骤...............................................................-8-3.1.1PLC控制系统设计的基本原则........................................................................-9-3.1.2PLC控制系统设计的一般步骤......................................................................-9-3.1.3PLC程序设计的一般步骤............................................................................-10-3.2PLC的选型和硬件配置.....................................................................................-11-3.2.1PLC型号的选择..............................................................................................-11-3.2.2S7-200CPU的选择......................................................................................-12-3.2.4热电式传感器.............................................................................................-12-3.2.5可控硅加热装置简介...................................................................................-13-3.3系统整体设计方案和电气连接图........................................................................-13-3.4.1控制系统数学模型的建立.............................................................................-1