文档介绍：毕业论文
(设计)
题目: 基于s7-200的锅炉水温串级系统计
(英文): S7-200-based Cascade regulation of boiler
water temperature monitor system
院别: 自动化学院
专业: xxx
姓名: xxx
学号: xxx
指导教师: xxx
日期: 2011年5月
摘要
20世纪80年代至90年代中期,是PLC发展最快的时期,年增长率一直保持为30~40%。在这时期,PLC在处理模拟量能力、数字运算能力、人机接口能力和网络能力得到大幅度提高,PLC逐渐进入过程控制领域,在某些应用上取代了在过程控制领域处于统治地位的DCS系统。
本文介绍了以锅炉为被控对象,以锅炉出口水温为主被控参数,以炉内水温为副被控参数,以加热炉电阻丝电压为控制参数,以PLC为控制器,构成锅炉温度串级控制系统;采用PID算法,运用PLC梯形图编程语言进行编程,实现锅炉温度的自动控制。
电热锅炉的应用领域相当广泛,在相当多的领域里,电热锅炉的性能优劣决定了产品的质量好坏。目前电热锅炉的控制系统大都采用以微处理器为核心的计算机控制技术,既提高设备的自动化程度又提高设备的控制精度。
本文分别就电热锅炉的控制系统工作原理,温度变送器的选型、PLC配置、组态软件程序设计等几方面进行阐述。通过改造电热锅炉的控制系统具有响应快、稳定性好、可靠性高,控制精度好等特点,对工业控制有现实意义。
关键词:锅炉控制系统温度控制串级控制 PLC PID
ABSTRACT
The 20th century, mid 80's to 90, is the PLC of the fastest growing period, annual growth rate has been maintained at 30 to 40%. During this period, PLC capability in dealing with analog and puting power, man-machine interface capabilities work capabilities have been greatly improved, PLC gradually entering the field of process control, in some applications in the field of process control replaced the dominant DCS System.
This paper introduces the boiler as the charged object to the boiler water temperature of the main accused of the export parameters to furnace temperature as deputy accused of parameters to control the heating resistance wire voltage parameters to PLC, controller, constitutes a series of boiler temperaturelevel control system; using PID algorithm, the use of PLC ladder programming language, programming, boiler temperature control.
Electric boilers a wide range of applications, in a considerable number of field, the electric boiler performance advantages and disadvantages of the decision The quality of the boiler control systems currently used mostly puter control microprocessor core technology, both to improve the automation equipment have improved the control precision equipment.
This paper on the heating boiler control system works, selection of temperatu