锅炉水位智能控制器设计

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锅炉水位控制系统是锅炉生产控制系统中最重要的环节。对锅炉生产操作如果不合理，管理不善，处理不当，往往会引起事故。这些事故中的大部分是由于锅炉水位控制不当引起的，可见锅炉汽包水位控制在锅炉设备控制系统中的重要性。
现代工业锅炉都向着大容量高参数的方向发展，-般锅炉容量越大，汽包的容水量就相对越小，允许波动的蓄水量就更少。这样对汽包水位要求就更高了。而在常规的三冲量控制系统中，由于虚假液位”的原因使得蒸汽负荷上升和下降时的动态特性曲线不对称，且系统参数具有时变性，不能求出准确的数学模型，也就不能设计出准确的前镭制器，只能实现静态前馈，能实现稳态无误差，但对动态性能控制不好。这样，就不能很好的满足现代工艺的要求。
考虑到模糊控制器的设计不需要知道该过程的数学模型以及它的其他特点都适合于这种蒸汽前镭制，所以我们决定在这里用模糊控制器代替了三冲量控制系统中的蒸汽前镭制中的常规控制器。而给水流量的扰动造成的汽包水位变化这-过程可以通过实验测试和数据处理得到精确的数学模型，这样就能够设计常规控制器来控制，并能达到很好的效果
德州仪器公司最近出MSC1211带有24位分辨率的Σ-ΔA/D转换器，16位D/A转换器，8通道多路开关，模拟输入通道测试电流源，输入缓冲器，可编程增益放大器，温度传感器，内部基准电压源，8位微控制器，程序数据存储器和数据SRAM等功能。
系统由传感器、单片机MSC1211、MAX7219显示芯片、编程接口、调节阀等几部分构成。系统的工作过程：从传感器来的信号进入到MSC1211的内部对信号进行处理，从而将流量值以相应的数字显示在显示器上。
本次设计的特点是：元件少、方案新、价格经济、体积孝编程方式简单、功能全、操作简单。


Fuzzy Control Of Boiler Steam Drum Fluid Level System And Hardware Design Based On System Level Microcomputer

Abstract
The water level control system of the boiler is that the boiler produces the most important link in the control system. If unreasonable to the production operation of the boiler， manage improperly， it is improper to deal with， will often cause the accident. The majority in these accidents is improper in control because of the water level of the boiler were caused， can see the importance in the equipment control system of the boiler of control of water level of steam dome of the boiler.
The modern industry boilers all develop in the direction of the large capacity high parameter， the general boiler is the larger in capacity， person who holds water of steam dome relative and light， water demand fluctuated to allow less.Have expected much the water level of the steam dome like this. Among routine three impulse control system， because reason of " false liquid location" make steam load rise and drop dynamic characteristic when curve asymmetric， degeneration， can ask out the accurate mathematics model when and there are the systematic parameters， can design the accurate feedforward controller either， can only realize the static feedforward ， can realize that there is not error in the stable state ， but does not control dynamic performance well. In this way， the request for meeting the modern craft that it can be very good.
Consider that the design of the fuzzy controller does not need to know that mathematics model and its other characteristics of this course are suitable for this kind of steam feedforward to control， So we determine replace three impulse steam feedforward of the control system control routine controller of with fuzzy controller in here. And this course of change of water level of steam dome caused to perturbation of water flow can pass experiment test and receive the accurate mathematics model with data processing ， can design the routine controller to control like this， and can reach very good result.
Dezhou instrument company produce MSC1211 with 24 resolution ratios Σ-Δ A/D converter recently，16D/A converter recently，8 passway more than No. switch， simulation input channel tests the electric current source， import the buffer ， gain the amplifier ， the temperature sensor ， the inside basic voltage source programmably， such functions as 8 little controllers ， procedure data memory and data SRAM 。