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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(yùn)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(dòng)化水平不高，人工作業(yè)量大，維護(hù)困難等缺點(diǎn)，與現(xiàn)代化工業(yè)需求不相適應(yīng)，因此提高輸煤系統(tǒng)自動(dòng)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(shè)計(jì)電廠輸煤控制系統(tǒng)，實(shí)現(xiàn)輸煤系統(tǒng)的啟停，進(jìn)煤量的檢測與調(diào)節(jié)，及備用系統(tǒng)自動(dòng)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(shè)計(jì)合理的方案。其次，在硬件部分中對各設(shè)備選型，分析需要控制的量，有稱重信號，速度信號，報(bào)警信號，各設(shè)備啟停，進(jìn)煤量調(diào)節(jié)。以
2、S7-200PLC作為主控制器，設(shè)計(jì)電機(jī)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(dá)到對皮帶機(jī)運(yùn)行速度的控制，從而實(shí)現(xiàn)進(jìn)煤量的調(diào)節(jié)。最后，在軟件部分，設(shè)計(jì)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(shè)計(jì)實(shí)現(xiàn)對系統(tǒng)的監(jiān)控。在這輸煤系統(tǒng)中，進(jìn)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
