锅炉汽包水位和过热蒸汽温度的控制 论文
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密 惠 保
摘要：在冶金、化工、机械等各类工业控制中，锅炉都得到了广泛应用。它具有环保、高效、体积小等优点。因此对锅炉控制系统的研究就显得十分有必要。本文介绍了以AT89S51单片机为核心的温度和液位控制系统的工作原理和设计方法。温度信号由温度芯片DS18B20采集，以数字信号的形式传送给单片机；水位信号由电接点水位计采集，以开关量形式传送给单片机。文中介绍了该控制系统的硬件部分，包括：温度检测电路、温度控制电路、水位检测电路，水位控制电路和其他一些单片机接口电路。文中还介绍了软件设计部分，在这里采用模块化结构编程。软件主要分三个部分：主程序、键盘中断及按键处理程序、T0中断程序。其他的一些子程序包括：温度信号处理程序、数码管显示程序、PID处理程序等。最后利用MATLAB和锅炉的近似数学模型，对温度控制进行了仿真。
关键词：锅炉；AT89S51单片机；DS18B20温度芯片；温度控制；水位控制；PID控制
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[资料来源：http://THINK58.com]
Abstract：Electric water boiler has been widely used in every kinds of industrial control，such as metallurgy, chemical industry, machinery etc.. It is environmentally friendly, efficient, small size and so on. So it is very necessary to study the control system of electric water boiler. This paper introduces the working principle and design method of the temperature and liquid level control system which is based on AT89S51 MCU. Temperature signal collected by DS18B20 temperature chip is transmitted to the MCU in the form digital signal. The water signal collected by electric contact sensor, is transmitted to the MCU in switch forms. In this paper, the control system hardware part includes temperature sensing circuit, temperature control circuit, the water level detection circuit, the water level control circuit and other microcontroller interface circuit. The paper also introduces the software part, which uses the modular structure in programming. Software part is divided into three main parts: the main program, the keyboard interrupt and key processes program, To interrupt program. Some other subroutines include: temperature signal processing, digital control program, PID process procedures. Finally, with MATLAB and the approximate mathematical model of electric boilers, the temperature control system is simulated.
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Keywords: Electric Water Boiler, AT89S51 MCU, DS18B20 Temperature Chip, Temperature Control, Water-level Control, PID Control.
[资料来源：http://think58.com]
[资料来源：http://THINK58.com][来源：http://think58.com]