PLC控制系统在煤气加压机中的应用摘要：煤气加压机用于煤气输送，是钢铁、煤炭、石化行业的重要设备，其电气控制方式多采用仪器仪表和继电-接触器系统断续控制，自动化程度和可靠性低，难以保证控制精度，且无法实现网络通讯和远程监控。本文设计了一套基于PLC的煤气加压机控制系统，实现了煤气加压自动控制；对装备现状与发展趋势进行了研究，提出了总体设计方案，选用FR-F740变频器实现风机调速，选用SBWR/Z温度传感器、EJA压力传感器实现现场数据采集，并将信号送至三菱FX2N-32M型PLC；设计了闭环控制PID算法，按照逻辑控制与过程控制结合的程序设计思路，基于GXDeveloper编程软件，开发了变频器控制程序，实现了风机的转速控制，设计了系统过载保护、故障报警、停机自动连锁等功能子程序。结果表明，采用PLC控制的煤气加压机具有操作简单、运行精良、抗干扰能力强、编程简单、控制精度高的特点，提高了系统的可靠性，通过PLC组网，实现远程监控，较好的达到了设计目的。关键词：煤气加压机；PLC；闭环控制；PID；变频器AppliacationofPLCcontrolsystemingaspressuremachineAbstract：Gaspressuremachineisusedintransportofgas,itisanimportantdeviceintheindustryofiron,steel,coalandpetrochemical.Itselectricalsystemmostlyuseinstrumentsandrelay-contactortocontrol.itisdifficulttoguaranteethatcontrolprecision,andunabletoperformnetworkcommunicationsandremotemonitoring.ThisarticlehasdesignedaPLC-basedgascontrolsystem,achievedtheautomaticcontrolofgaspressure.Situationanddevelopmenttrendoftheequipmenthasbeenstudied,proposeddesignplan,useFR-F740frequencytocontrolfanspeed,UseSBWR/Ztemperaturesensors,pressuresensorsEJAtofielddatacollection,andsendthesignaltoMitsubishiFX2N-32MPLC;designedaclosed-loopcontrolPIDalgorithm,followlogiccontrolandprocesscontrolprogramdesignidea,developerprogrammingsoftwarebasedGX,developedtheinvertercontrolprogramforfanspeedcontrol,anddesignasystemoverloadprotection,alarmdowntimefeaturessuchasautomaticchainsubroutine.TheresultsshowedthatusePLCcontrolofgashasasimpleoperation,runsophisticated,uding,programmingsimple,controlandhighprecision,increasedsystemreliability,throughnetworking,PLCforremotemonitoring,betterdesigngoalisreached.Keywords:gaspressuremotor;PLC;loopcontrol;PID;VFD目录1绪论.............................................................................................................................11.1课题背景...........................................................................................................11.2煤气加压机装备现状与发展趋势...................................................................21.3控制系统的国内外发展现状...........................................................................31.4煤气加压机系统控制的概念...........................................................................42PLC控制系统概述.....................................................................................................62.1PLC简介...........................................................................................................62.2PLC的发展.......................................................................................................62.3PLC控制系统的结构与工作原理...................................................................73武钢煤气加压机控制系统总体方案设计.................................................................93.1控制系统组成...................................................................................................93.2原系统存在的问题.............................................
