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内蒙古科技大学本科生毕业设计说明书（毕业论文）内蒙古科技大学毕业设计说明书（毕业论文）I热电厂锅炉的温度控制系统摘要本文是针对锅炉过热蒸汽温度控制系统进行的分析和设计，而在锅炉主汽温度控制系统中，也有越来越多的方法可以实现生产控制，这里需要对过热器的出口蒸汽温度进行检测，当温度不在控制范围内时就通过对减温器阀门的控制，利用PLC设计锅炉主汽温度控制系统，并加以组态，仿真，实现对汽包主蒸汽温度的控制，以产生合格的产品。本设计采用串级控制系统，这样可以极大地消除控制系统工作中的各种干扰因素，使系统能在一个较为良好的状态下工作，同时使锅炉过热器出口蒸汽温度在允许的范围内变化，并保护过热器管壁温度不超过允许的工作温度。在本设计用到的串级控制系统中，主对象为送入负荷设备的出口温度，副对象为减温器和过热器之间的蒸汽温度。通过控制减温水的流量来实现控制过热蒸汽温度的目的。关键词：温度控制；PLC；组态；仿真；内蒙古科技大学毕业设计说明书（毕业论文）IIThetemperatureofthethermalpowerplantboilercontrolsystemAbstractThisarticleisananalysisanddesignoftemperaturecontrolsystemofsuperheatedsteaminboiler.Andinthemainsteam’stemperaturecontrolsystem,thereareanincreasingnumberofwaystocontroltheproduction.Hereadetectionforthesuperheateroutletsteamtemperatureisneeded.Whentemperatureisnotinthecontrolrange,weneedtocontrolthevalveofdesuperheater,themainsteamtemperaturecontrolsystemofaboilerusingPLC,togetherwiththeconfiguration,simulation,toachievethemainsteamtemperaturecontrolofthedrumtoproducequalifiedproducts.Thisdesignusesacascadecontrolsystem,whichcangreatlyeliminateavarietyofconfoundingfactorsinthecontrolsystemoperation,sothatthesystemcanworkinarelativelygoodworkingstate,whilethesteamtemperatureofboilersuperheateroutletiswithintheallowablerange,andtoprotectthesuperheatertubewalltemperaturedoesnotexceedtheallowableoperatingtemperature.Inthecascadecontrolsystemofthisdesign,themainobjectistheoutlettemperatureoftheloadequipment,viceobjectisthetemperatureofthesteambetweendesuperheaterandsuperheater.Bycontrollingtheflowofdesuperheatingwatertocontrolthesuperheatedsteamtemperature.Keywords:temperaturecontrol;PLC;Theconfiguration;Thesimulation;内蒙古科技大学毕业设计说明书（毕业论文）III目录摘要.........................................................................................................................................IAbstract......................................................................................................................................II第一章绪论............................................................................................................................1第二章生产工艺概述..............................................................................................................22.1热电厂发电概述.........................................................................................................22.2锅炉系统.....................................................................................................................32.2.1锅炉概述..........................................................................................................32.2.2锅炉、锅筒设备及结构...................................................................................42.2.3锅炉控制的工作原理......................................................................................42.3锅炉蒸汽温度控制.....................................................................................................5第三章锅炉主汽温度控制系统综述......................................................................................83.1锅炉主汽温度控制原理.............................................................................................83.2锅炉主汽温度控制系统安全保护对策......................................................................93.3锅炉主汽温度控制系统的理论依据........................................................................103.3.1闭环控制........................................................................................................103.3.2串级系统........................................................................................................103.3.3PID控制..........................................................................................................11第四章热电厂锅炉温度控制系统的硬件设计.....................................................................134.1PLC的选型和硬件配置............................................................................................134.1.1PLC型号的选择.............................................................................................134.1.2S7-200CPU的选择........................................................................................134.2主、副控制回路的设计原则...................................................................................14内蒙古科技大学毕业设计说明书（毕业论文）IV4.3温度变送器的选择...................................................................................................154.3.1SBWR系列温度变送器概述.........................................................................174.3.2SBWR-4160温度变送器................................................................................174.4反比例阀的选择.......................................................................................................194.4.1型号选择........................................................................................................194.4.2参数设定――模拟量型.................................................................................204.4.3技术参数........................................................................................................214.5系统硬件接线图.......................................................................................................22第五章热电厂锅炉的温度控