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毕业设计论文姓名：学号：学院：技术学院专业：热能动力工程题目：火电厂烟气脱硫技术指导教师：讲师2014年6月摘要I摘要本论文简要阐述了烟气脱硫的目的，比较了湿法、干法、半干法脱硫的优缺点，论证了石灰石-石膏湿法烟气脱硫技术是脱硫效率最高且最常用的方法，分析了湿法烟气脱硫的工艺过程。介绍了烟气脱硫装置的运行参数检测和控制及连锁保护。特以韩城第二发电厂为例集中分析。经FGD处理后的烟气达到国家环保标准，其效率达95％以上。根据湿式石灰石烟气脱硫工艺及方案，文中给出以参与采集数据与过程控制的可编程控制器（PLC）为现场控制级，通过以太网技术搭建集散式控制系统，并以MCGS组态软件实时监控系统的设计方案。其中，针对湿式石灰石-石膏烟气脱硫过程具有的大惯性、时滞，非线性等特点，利用PLC的PID算法实现烟气脱硫中的吸收塔ph控制与流量控制。MCGS作为上位机软件提供友好的用户界面，实现了运行参数流程与列表数据显示。关键词：石灰石-石膏湿法烟气脱硫；吸收塔；石灰石；烟气脱硫东北电力大学本科毕业论文IIAbstractThispaperbrieflyexpoundstheobjectivecomparisonoffluegasdesulfurization,wet,dry,semi-drydesulfurizationadvantagesanddisadvantages,discusseslimestone-gypsumwetfluegasdesulfurizationtechnologyisthedesulfurizationefficiencyishighestandmostcommonlyusedmethod,analysisofwetfluegasdesulfurizationprocess.Introducesthefluegasdesulfurizationdeviceoperatingparametersdetectionandcontrolandinterlockprotection.SpecialtotheHanchengsecondpowerplantisexempleconcentrationanalysis.AftertreatmentofFGDfluegastoreachthenationalenvironmentalprotectionstandards,itsefficiencyismorethan95%.Accordingtothewetlimestonefluegasdesulfurizationprocessandscheme,ispresentedinthispaperinordertoparticipateinthedatacollectionandprocesscontroloftheprogrammablelogiccontroller(PLC)forfieldcontrollevel,throughtheEthernettechnologytobuilddistributedcontrolsystem,andMCGSconfigurationsoftwarereal-timemonitoringsystemdesign.Amongthem,thewetlimestonegypsumfluegasdesulfurizationprocesswithgreatinertia,timedelay,nonlinear,usingPLCPIDalgorithminfluegasdesulfurizationabsorptiontowerpHcontrolandflowcontrol.MCGSasahostcomputersoftwarewithfriendlyuserinterface,toachievetheoperationparametersofprocessanddatadisplaylist.Keywords:Limestone-gypsumwetfluegasdesulfurization;absorptiontower;limestone;desulfurizationoffluegas目录III目录摘要......................................................................................................................................IAbstract...............................................................................................................................II第1章绪论.......................................................................................................................11.1我国SO2排放现状和SO2的危害.........................................................................11.2烟气脱硫的目的.....................................................................................................61.3烟气脱硫FGD的控制水平...................................................................................6第2章火电厂烟气脱硫技术的概述.................................................................................72.1FGD的分类.............................................................................................................72.1.1湿法FGD技术.............................................................................................72.1.2干法FGD技术.............................................................................................72.1.3半干法FGD技术.........................................................................................72.1.4三种工艺的比较...........................................................................................8第3章石灰石\石灰-石膏湿法烟气脱硫...........................................................................93.1石灰石\石膏-石膏湿法烟气脱硫的基本原理.......................................................93.2石灰石\石灰-石膏湿法烟气脱硫的工艺流程.....................................................103.3烟气脱硫的工艺系统简述...................................................................................103.4火电厂锅炉烟气脱硫的工艺特点.......................................................................11第4章石灰石湿法烟气脱硫装置的构成.....................................................................12第5章石灰石湿法烟气脱硫装置的运行参数检测.......................................................135.1脱硫装置运行参数检测的特点...........................................................................135.2主要参数的检测...................................................................................................135.3主要检测参数的测点布置...................................................................................14第6章脱硫装置的运行的主要控制系统.......................................................................156.1增压风机入口压力控制.......................................................................................156.2吸收塔PH值及塔出口SO2浓度控制...............................................................156.3吸收塔液位控制...................................................................................................186.4石膏浆液排出量控制...........................................................................................196.5石灰石浆液箱的液位与浓度控制.......................................................................206.6真空皮带脱水机石膏层厚度控制.......................................................................20第7章烟气脱硫装置的顺序控制、保护与连锁...........................................................217.1烟气脱硫主要SCS功能组..................................................................................217.2烟气脱硫装置的保护连锁...................................................................................21第8章工程实例............................................