摘 要从 1996 年开始我国的发电量就稳居世界第二,而在我国煤炭资源丰富,热力发电厂大部分都是火力发电厂,火电厂中的输煤系统是其重要的组成部分。由于火电厂中运行的环境差和劳动强度大,我们想迫切地想用一种非人力工作来代替我们的人体手工劳动。改变这种状况的时间是人类发明了可编程逻辑控制器(programmable logic controller,简称 PLC),根据电厂的实际情况,在输煤系统自动化改造工程中一般采纳可编程逻辑控制器实现对生产设备的自动检测与控制。电厂输煤程控系统一般包括卸煤系统、储煤系统、上煤系统和配煤系统几个部分,具有组成设备多且位置分散、设备间联锁关系强、设备运行环境恶劣、安全性可靠性要求高等方面特点,一般采纳以可编程控制器(PLC)为主要控制设备的监控系统来实现对整个工艺过程的控制。本文在了解输煤流程和设备的基础上,通过输煤流程图和输煤皮带保护图统计出设备数目,进而统计所需 I/O 点的数目,进行 PLC 选型.介绍 PLC 在输煤控制系统中的应用,主要是通过输煤皮带控制、控制犁煤器抬起落下和叶轮给煤机控制来实现的,最后提出输煤系统的控制策略。从而改善了火电厂的工作坏境,提高了火电厂的工作效率。关键词 输煤系统,PLC,火电厂AbstractSince 1996 our country's power is ranks second in the world, and in my country is rich in coal resources , thermal power plants are mostly coal—fired power plants, coal conveying system in thermal power plants is an important part of it. Due to thermal power plants running in the environment and the intensity of labor is big, we want to desperately want to work with a kind of human to replace our human manual labor 。 Change this time is human invented the programmable logic controller (programmable logic controller, PLC), according to the actual situation of power plant, commonly used in automated reconstruction project of a coal conveying system programmable logic controller to realize the automatic detection and control of the production equipment 。 Power plant coal SPC system generally includes coal unloading system , s...