换热器热流出口温度控制

毕业设计说明书GRADUATETHESIS论文题目：换热器热流出口温度控制学院：电气工程学院摘要-I-摘要换热器作为一种标准工艺设备已经被广泛应用于动力工程领域和其他过程工业部门。以工业上常用的列管式换热器为例,热流体和冷流体通过对流热传导达到换热的目的,从而使换热器物料出口温度满足工业生产的需求。但由于目前制造工艺的限制,控制方式的单一性,换热器普遍存在控制效果差,换热效率低的现象,造成能源的浪费。如何提高换热器的控制效果,提高换热效率,对于缓解我国能源紧张的状况,具有长远的意义。本课题来源于对SMPT—1000实验平台换热器的研究，对于换热器热流出口温度的控制，使用PID控制来进行调节，通过不断的调整其参数，确定一个比较准确的参数值，通过调整冷水阀的开度调整其流量来控制热流的出口温度。本设计利用PCS7来完成整个系统自动控制，通过PCS7软件对系统进行硬件和软件组态，完成控制出口温度的编程，最后通过人机界面监控维护控制系统正常运行。关键词换热器;温度;PID控制;PCS7Abstract-II-AbstractHeatexchangerasastandardprocessequipmenthasbeenwidelyusedinthefieldofpowerengineeringandotherprocessindustries.Intheindustrycommonlyusedshellandtubeheatexchanger,forexample,thehotfluidandcoldfluidheattransferbyconvectionheattransfertoachievethepurpose,sothattheheatexchangeroutlettemperatureofthematerialtomeettheneedsofindustrialproduction.However,asthemanufacturingprocessconstraints,controlunity,commonheatexchangercontrolispoor,thephenomenonoflowheattransferefficiency,resultinginwasteofenergy.Howtoimprovethecontrolperformanceoftheheatexchangertoimproveheattransferefficiency,toeaseChina'senergyshortagesituation,havelong-termsignificance.ThedesigncomesfromtheSMPT-1000testplatformresearchexchangerforheatexchangeroutlettemperaturecontrol,theuseofPIDcontroltoadjust,throughcontinuousadjustingitsparameterstodetermineamoreaccurateparametervaluesbyadjustingopeningofthecoldwatervalvetocontroltheflowofadjustmentoftheoutlettemperatureoftheheatflow.ThisdesignusesPCS7tocompletethesystemofautomaticcontrolbyPCS7softwareonthesystemhardwareandsoftwareconfiguration,completecontroloftheoutlettemperatureoftheprogramming,thelastoperatingnormallybyHMImonitoringandcontrolsystem.KeywordsHeat;temperature;PIDcontrol;PCS7目录-III-目录摘要.............................................................................................................................IAbstract.........................................................................................................................II目录....................................................................................................................III第1章绪论..................................................................................................................11.1换热器设备......................................................................................................11.2选题背景及意义.............................................................................................11.3国内外研究现状及发展史..............................................................................21.4本设计主要内容..............................................................................................41.5本章小结.........................................................................................................4第2章系统工艺流程及算法控制..............................................................................52.1SMPT-1000实验平台及换热器......................................................................52.2换热器.............................................................................................................62.2.1高阶换热器...............................................................................................62.2.2换热器工作原理........................................................................................62.3PID控制...........................................................................................................72.3.1PID基本介绍............................................................................................72.3.2参数整定.................................................................................................102.3.3主要功能和应用.....................................................................................122.4控制系统的设计............................................................................................132.4.1温度控制特点..........................................................................................132.4.2换热器温度控制系统.............................................................................132.5本章小结........................................................................................................15第3章基于PCS7实现系统控制..............................................................................163.1PCS7简介......................................................................................................163.2PCS7作用......................................................................................................163.3PCS7控制系统结构......................................................................................173.4工程项目的建立............................................................................................183.5控制系统硬件设计与组态...........................................................................193.5.1硬件系统组成.........................................................................................193.5.2硬件选型选型以及通讯.........................................................................203.5.3操作员站组态.........................................................................................213.5.4网络连接组态..................