基于plc的输煤控制系统.doc

 基于PLC的输煤控制系统  摘要 本文深入研究了当代热电厂输煤程控系统具体实施方法以及效应。作为一种应用于工业控制的自动装置，PLC本身具有一定抗干扰能力，比较适应工业现场环境。尽管如此，由于很多热电厂输煤系统运行条件恶劣，各类干扰信号较多，使得抗干扰问题成为输煤程控设计、调试及运行中的一大难题。许多电厂输煤程控系统不能长期稳定运行，抗干扰能力差是其最主要的原因。本文对实现燃煤程控系统的稳定运行的深入研究，在工程上有着重要应用价值。输煤设备的控制系统可分为皮带运输机(包括筛碎设备、除铁、除木、除尘设备和计量设备)的控制、卸煤设备的控制、煤场机械的控制和给配煤系统设备的控制四个部分。皮带运输机在火力发电厂输煤系统中，承担了全厂来煤的运输、提升、分配等工作，是输煤系统的主要设备。因此，皮带运输及控制方式的合理选择，直接关系到整个输煤系统的安全运行。 利用PLC可以把整条运输线集中到一个控制系统中,可以方便地实现机旁连锁就地控制、中控室PLC集中连锁控制等多种控制方式,在运输线的终端和火电厂控制室都可以对运输线的各种保护传感器等进行有效地监测。以某火电厂为例,介绍系统的结构组成、控制系统具备的功能等。 关键词 输煤，PLC，带式输送机In this paper the original was thoroughly researcied some kinds of anti jamming steps is living that concrete implementation means of coal SPC system along with effect are beaten to dragon and phoenix heat and power plant.As one kind of auto-plant that the application is to industry Control, The PLC in itself havees the specified anti jamming capability，Comparatively adapt to the environment at industry field.Although such in this way, Since the fact the coal measures together operational condition odiously is beaten in dragon and phoenix heat and power plant，Different type is interfereed the signal moreCausing that the antijamming problem becomes is beaten the coal SPC to design、The debug reaches one a great hard nut to crack in the operation.Much electric power plants are beaten the coal SPC and systematically cannot over along period of time steady the operation,It is such the mainestreason that the antijamming capability falls short of .The original ignites coal SPC system thoroughly researching of steady operation to the realization，Being living possess significant applicatio value in the project .The control system to be beaten coal installation may be divided into the leather belt transport aircraft (Consising of shifters fragmentary installation、Except for iron ,Except for timber ,Dust exclusion installation and measure installation )Control、Unload coal installation control、Coal yard machine control and givin