plc 控制系统在煤气加压机中的应用_毕业论文摘要：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，其电气操纵方式多采纳仪器外表和继电-接触器系统断续操纵，自动化程度和可靠性低，难以保证操纵精度，且无法实现网络通讯和远程监控。本文设计了一套基于 PLC 的煤气加压机操纵系统，实现了煤气加压自动操纵；对装备现状与进展趋势进行了讨论，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；设计了闭环操纵 PID 算法，根据逻辑操纵与过程操纵结合的程序设计思路，基于 GX Developer 编程软件，开发了变频器操纵程序，实现了风机的转速操纵，设计了系统过载爱护、故障报警、停机自动连锁等功能子程序。结果表明，采纳 PLC 操纵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、操纵精度高的特点，提升了系统的可靠性，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；闭环操纵；PID；变频器Appliacation of PLC control system in gas pressure machineAbstract：Gas pressure machine is used in transport of gas,it is an important device in the industry of iron,steel,coal and petrochemical .Its electrical system mostly use instruments and relay-contactor to control. it is difficult to guarantee that control precision, and unable to perform network communications and remote monitoring.This article has designed a PLC-based gas control system, achieved the automatic control of gas pressure. Situation and development trend of the equipment has been studied, proposed design plan, use FR-F740 frequency to control fan speed , Use SBWR/Z temperature sensors, pressure sensors EJA to field data collection, and send the signal to Mitsubishi FX2N-32M PLC; designed a closed-loop control PID algorithm, follow logic control and process control program design idea, developer programming software based GX, developed the inverter control program for fan ...
