PLC在火电厂吹灰控制系统中的应用.docVIP

中文摘要 锅炉运行过程中各部分受热面都会有积灰，积灰不仅影响传热效果，严重时还会形成结焦影响锅炉寿命，甚至损坏受热面。所以在火力发电厂生产过程中使用吹灰控制系统定期对锅炉的炉膛及烟道进行吹扫。这样可以保持锅炉的清洁，减少传热阻力，从而提高锅炉运行的经济性。 为了更好的适用系统运行，新机组配置了新型控制器—可编程控制器，并以欧姆龙C200H可编程控制器为例，本文介绍了锅炉吹灰控制系统的控制逻辑及其梯形图的设计，并详尽介绍了吹灰顺序控制系统的被控对象，控制系统的组成，控制方式及基本功能。 在文中还简单介绍了可编程控制器的功能、特点及应用。并以C200H为例，详尽介绍了PLC在锅炉吹灰控制系统中的应用和C200HPLC的硬件配置及编程使用方法。同时也介绍了怎样利用梯形图设计程序。 吹灰顺序控制系统所用的控制装置有多种，早期曾采用继电器逻辑门电路，二级管短阵电路或单片机控制，由于上述控制装置硬件接线接点较多，钢子可靠性差，故障难于查找等缺点，给吹灰顺序控制系统的运行维护带来很大的困难，目前新机组都配备以新型控制器—可编程控制器为控制装置的吹灰顺序控制系统。 关键词 锅炉吹灰，可编程控制器，梯形图 Abstract There is much dirt at many heated—surface in the running course of boiler.It is not only influencing heat transmission effect.So the boiler purging dust control system is adopted to the produce course of Electric Power Station.In the system,purging dust is used regularly to purge the Stove and the flue. It can keep the boiler clean,produce transmitting heat cbstruction raise its economic of the running of the boiler. In order to running the system.net unit also deployed new pattern controller—programmable Logic controller,and took 0mron C200H PLC for example.The article introduced control Logic of boiler purge dust sequence control system and its Ladder Logic designing.And details introduced object way and basic function of control system. In this article too introduced function,character and application of programmable controller,and took C200H PLC for example details introduced application of programmable Logic controller in power plant boiler purge Dust sequence control system,and hardware system of C200H PLC and how use programmer and design program use Ladder Logic program Language. The equipments which the order control system of blow ash uses,have many kinds,in early times over using relay,the circuit of Logical door,the circuit of diode,of the control of single machine,as the last control equipments have many hard line spots,as well as the reliability is very low,finding the hitch is very hard,which bring many difficulties in moving a