基于西门子S7-300PLC的除雾器自动控制系统的设计摘要随着我国经济社会的快速发展、人民生活水平的不断提高，公众对环境质量的要求也在不断提高。随着我国“节能减排”工作的开展和深入，降低污染物排放总量、实现环境达标，成为了我国的一项长期任务。根据国家环保工作要求，生产企业必须加强生产工艺过程的除尘设施建设，因此，钢铁行业现有烧结设备要全部采用高效除尘器。根据某钢铁公司烧结机除尘设备改造项目的要求，对烧结机机头脱硫塔排放的烟气进行深度治理，新设计一套除雾器，并为除雾器设计一套电气自动控制系统。由于除雾器内部被控设备分布分散，因此，电气控制系统同时具有就地控制和远程控制两种功能。就地控制是根据被控设备的分布，在被控设备附近设就地控制箱，由按钮手动完成控制任务，控制电路的控制任务主要是由继电开关完成。远程控制是由电子控制装置实现对所有被控设备的集中控制。由于PLC作为工业环境下使用的专用电子控制装置，适用于各种现场信号检测、运行监控和自动化控制，因此采用西门子S7-300PLC作为控制系统的核心控制器。远程控制是由远程计算机的组态程序画面控制。电气控制系统简单可靠，易于实现，以极小的成本实现了除雾器的自动控制。图24幅；表8个；参45篇关键词：除雾器；就地控制；远程控制；S7-300PLC分类号：TP242.3-I-AbstractWiththerapiddevelopmentofeconomyandsociety,thecontinuousimprovementofqualityoflife,Peoplehasproposedhigherrequirementofenvironmentalquality.Alongwiththeworkof‘energyconservationandemissionsreduction’,reducingthepollutantemissions,beinguptoenvironmentalstandardshavebecamealong-termtaskofourcountry.Accordingtothenationalenvironmentalprotectionrequirements,manufacturingenterpriseshavetostrengthentheconstructionofdust-removalfacilitiesinproductionprocess,therefore,thesinteringworkshopinironandsteelcompanyhastoadoptmoreeffectivedust-removaldevices.Inthedust-removaldevicesrenovationprojectinsinteringworkshopofanironandsteelcompany,anewdevicecalledwetscrubberisdesignedforexhaustedgascontrolofdesulfurizationtower,andasetofelectricalautomaticcontrolsystemforwetscrubberisproposedatthesametime.Theelectricalcontrolsystemhadtwofunctionsoflocalcontrolandremotecontrolastodispersiondistributionofthecontrolleddevicesinsidethewetscrubber.Inthelocalcontrolmode,thecontroltaskiscompletedbybuttonsonthecontrolboxwhichcancontroloneormoredevicesnearby.Intheremotecontrolmode,thecontroltaskforallcontrolleddevicesiscompletedbyanelectroniccontrolunit.ThisdesigntookSiemensS7-300PLCasthecorecontrollerinelectricalcontrolsystem,becausePLCisaspecialelectroniccontrollerforindustrialenvironment,andissuitableforallkindsofsignaldetection、operationmonitoringandautomaticcontrol.Thisdesigncompletedthelocalcontroldesignandtheremotecontroldesignrespectively.Themaincircuitandcontrolcircuitofcontrolleddevicesusingonecontrolboxareproposedinlocalcontroldesign,andexplainofthecontrolprocessisgiven.Inremotecontroldesign,PLCanaloginputcircuit,on-offinputcircuitandoutputcircuitareproposed,andaninput/outputtableisgiven.ThecontrolprogramofPLCladderisproposedatthesametime.ItalsoexplainedthePLCcontrolprocess.Thissystemissimple,reliable,easytoimplement,andwithminimalcosttoachievetheautomaticcontrolofwetscrubber.Figure24;Table8;Reference45Keywords:wetscrubber;localcontrol;remotecontrol;S7-300PLCChinesebookscatalog:TP242.3-II-目次引言............................................................................................................................1第1章绪论..............................................................................................
