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本科毕业设计（论文）
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论文提交日期 2011年6月20日
论文答辩日期 2011年6月22日
答辩委员会主席签字：
谱进样瓶摘 要
从上世纪80年代至90年代中期，PLC得到了快速的发展，在这时期，PLC在处理模拟量能力、数字运算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。PLC具有通用性强、使用方便、适应面广、可靠性高、抗干扰能力强、编程简单等特点。PLC在工业自动化控制特别是顺序控制中的地位，在可预见的将来，是无法取代的。 本文介绍了以换热站为被控对象，以PLC为控制器进行编程，实现换热站温度的自动控制。 换热站的应用领域相当广泛，在相当多的领域里，换热站的性能优劣决定了经济效益的高低。曝气盘
本文分别就换热站的控制系统工作原理，温度变送器的选型、PLC配置等几方面进行阐述。通过改造换热站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：换热站的控制系统 温度控制 PLC
ABSTRACT
From the last century to 90 in the mid 80's, PLC has been rapid development in this period, PLC capability in dealing with analog and digital computing power, man-machine interface capabilities and network capabilities are greatly improved, PLC gradually entering the field of process control, replaced in some applications in the field of process control dominant DCS.PLC has the versatility, ease of use, wide adaptation, high reliability and strong anti-interference, simple to program and so on.PLC control, especially in the industrial automation sequence control the position, in the foreseeable future, is no substitute.
游戏推广系统
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 product.Electric boiler control systems currently used mostly for computer 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 temperature transmitter, PLC configurations, the configuration software design aspects were described.Through the transformation of electric boiler control system has fast response, good stability, high reliability, control accuracy and good features, practical significance for industrial control.
Key words: heat transfer station control system temperature control PLC PID
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