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1、摘要輸煤系統(tǒng)是電廠的重要組成部分,電廠輸煤系統(tǒng)運作的性能關(guān)系到電廠生產(chǎn)效率以及工人的身體健康。由于早期的輸煤系統(tǒng)的自動化水平不高,人工作業(yè)量大,維護困難等缺點,與現(xiàn)代化工業(yè)需求不相適應,因此提高輸煤系統(tǒng)自動化程度是必然選擇。電廠輸煤以往的控制方式落后,本文采用S7-200系列的PLC,以PLC為核心,設計電廠輸煤控制系統(tǒng),實現(xiàn)輸煤系統(tǒng)的啟停,進煤量的檢測與調(diào)節(jié),及備用系統(tǒng)自動切換功能。首先從輸煤系統(tǒng)工藝流程出發(fā),對控制系統(tǒng)分析,設計合理的方案。其次,在硬件部分中對各設備選型,分析需要控制的量,有稱重信號,速度信號,報警信號,各設備啟停,進煤量調(diào)節(jié)。以
2、S7-200PLC作為主控制器,設計電機和變頻器的控制電路,繪制電氣控制原理圖,通過PLC對變頻器的控制達到對皮帶機運行速度的控制,從而實現(xiàn)進煤量的調(diào)節(jié)。最后,在軟件部分,設計系統(tǒng)流程圖和編寫系統(tǒng)的控制程序,以及對組態(tài)監(jiān)控界面的設計實現(xiàn)對系統(tǒng)的監(jiān)控。在這輸煤系統(tǒng)中,進煤量控制調(diào)節(jié)由觸摸屏監(jiān)控,不用在工業(yè)現(xiàn)場人工操作,減少工作量,提高輸煤效率。關(guān)鍵詞:輸煤系統(tǒng);PLC;變頻器;監(jiān)控IVAbstractThe?coal?handling?system?is?an?importantpartofpowerplant,andtheoperatingperfo
3、rmanceofcoalhandlingsystemwillaffecttheproductivityofapowerplantandthehealthofitsworkers.Sincetheearlycoalhandlingsystemshavethedefectssuchaslowautomation?level,?a?large?amount?of?manual?work?andmaintenancedifficulties,whichareincompatiblewiththeneedsofmodernindustry,increasing
4、theautomationslevelofcoalhandlingsystemisinevitable.Thepreviouscontrolmethods?of?the?coal?handling?system?arebackward.ThisthesisusedtheS7-200seriesofPLCasthecoretodesignthecoalhandlingcontrolsystemwhichcouldrealizestartandstopofcoalhandlingsystem,detectionandregulationofcoalfee
5、dandautomaticswitchingofbackupsystem.First,withthetechnologicalprocessofthecoalhandlingsystemasastartingpoint,itanalyzedthecontrolsystemanddesignedareasonableplan.Second,inthehardwarepart,itselectedvariousdevicesandanalyzedtheamounttobecontrolled,suchasweighingsignal,speed?sign
6、al,?alarm?signal,?motor?start-stop?aswellascoaltestingandregulation.WithS7-200PLCasthemastercontroller,itdesignedthecontrolcircuitofmotorandtransducer,drewtheelectricalcontrolschematics,andrealizedcontroloverthebeltconveyorspeedthroughcontroloverinverterviaPLC,soastoregulatethe
7、coalfeed.Finally,inthesoftwarepart,itdesignedthesystemflowchart,wrotethesystemcontrolprogram,anddesignedtheconfigurationmonitoringinterfacetomonitorthesystem.Inthecoalconveyingsystem,coalfeedcontrolandregulationaremonitoredviathetouchscreen,whichrequiresnomanualoperationinthein
8、dustrialfield,reducesworkload,andimprovesthecoalhandli