流化床锅炉床温主汽压控制系统的设计与仿真 毕业论文正文.doc

流化床锅炉床温主汽压控制系统的设计与仿真_毕业论文正文(此文档为word格式,下载后您可任意编辑修改!)
毕业设计(论文)
系别
动力工程系
专业班级
自动化专业06K1班
学生姓名
指导教师
流化床锅炉床温主汽压控制系统的设计与仿真
题目
二○一○年六月
流化床锅炉床温与主汽压控制系统的设计与仿真
摘要
循环流化床锅炉(简称CFB锅炉)具有燃烧效率高、燃烧适应性广、低污染等独特优点,受到世界各国的广泛重视并得到迅速发展。但CFB锅炉在理论和实践两方面仍有许多不完善之处,尤其在床温主汽压控制系统方面,大多数CFB锅炉自动化水平不高,有的至今仍采用手动操作,其原因是由于CFB锅炉是一个多参数、非线性、时变及变量紧密耦合的复杂系统。CFB锅炉很难建立精确的数学模型,如果采用固定参数的常规控制器,当工况发生较大变化时,很难保证控制系统的控制品质。相关研究设计结果表明,要想取得较好的控制效果必须将有耦合关系的系统经行解耦,因此本文针对CFB锅炉的特殊性,寻找到被控对象的传递函数,对传递函数应用对角矩阵经行解耦,将解耦后的被控对象看做是两个彼此独立的系统,进而设计PID控制器。通过仿真分析结果表明该方法能够在完成床温主汽压系统解耦的前提下,方便地实现循环流化床锅炉控制优良的静动态特性。解耦后的控制系统具有较好的抗干扰能力、鲁棒性等。
关键字:循环流化床锅炉(CFB);床温主汽压;对角矩阵解耦;PID控制;
Fluidized bed boiler main steam pressure control system design and simulation
Abstract
fluidized bed boiler (CFB boiler for short) efficiency, combustion and wide adaptability, low pollution and other unique advantages are the world wide attention and rapid development. But the CFB boiler both in theory and in practice there are still many imperfections, in particular, the main steam pressure in the bed temperature control system context, most of CFB boiler automation level is not is due to CFB Boiler is a multi-parameter, nonlinear, time-varying and variable system of closely plex. CFB boiler is difficult to establish accurate mathematical model, if the conventional controller with fixed parameters, significant changes occur when the condition was difficult to ensure quality control system of control. Research design results show that, in order to obtain better control effect relationship must be a coupled line system decoupled, so the particularity of this paper CFB boiler, to find the transfer function of the object and, on the application of the transfer function of the angle matrix by row decoupling, the decoupling of the plant is seen as two separate systems, then design PID controller. The simulation results show that the method plete the bed temperature in the main steam pressure system is decoupled under the premise of convenience Germany to achieve good control of circu