英语原文共 3 页

The Research On The New Boiler Water Level Automatic Control System

新型锅炉水位自动控制系统的研究

Abstract—The boilerrsquo;s drum water level is a material balance indicator between which are the output of steam and water supply. It is a parameter of both the security and the quality. Some questions in the existing automatic control system of the boiler of water level are the low-control accuracy, the poor dynamic characteristics, the weak anti-interference ability and the high energy expenditure, etc. This article describes a new way of boiler of water level of automatic control system for the robustness. We design a new measuring device of drum water level measuring devices and constitute a single closed-loop control system combined with the technology of frequency conversion. We also give a practical example to illustrate the its actual effect.

摘要锅炉汽包水位是物料平衡蒸汽和水输出的指示器供应。它是安全性和质量的一个参数。现有自动控制系统中的一些问题锅炉的水位控制精度低，性能差动态特性，抗干扰能力弱 本文介绍了一种新的能源消耗方式。锅炉水位自动控制系统 稳健性。我们设计了一种新的汽包水测量装置。液位测量装置并构成一个单闭环结合频率技术的控制系统 转换。我们还举了一个实例来说明实际效果。

Keywords- drum water level robustness; frequency conversion Technology

关键词：汽包水位鲁棒性；变频技术

1． INTRODUCTION

介绍

As the important operation parameters the boilerrsquo;s drum water level are needed for automatic control. At present the boilerrsquo;s drum water level automatic control mostly adopts traditional three impulse PID control or using adaptive method, fuzzy control rule. But the automatic control effect of the boilerrsquo;s water level is not ideal now, there are still some problems such as the low accuracy, the poor dynamic characteristics, weak anti-interference ability and high energy consumption.

锅炉汽包水位作为锅炉的重要运行参数，需要进行自动控制。目前 锅炉汽包水位自动控制主要采用传统的三脉冲PID控制或采用自适应方法，模糊控制规则。但是自动控制的效果现在锅炉的水位不理想，还有一些精度低、动态性差等问题特点，抗干扰能力弱，能量高消费。

II．THE STUDY ON THE NEW BOILER AUTOMATIC CONTROL

SYSTEM

新型锅炉自动控制的研究系统

A. The Original Boiler Water Level Control System

As the objects in the boiler water level within the automatic control system boiler drum water level establish the mathematical model in the current boiler automatic control system.

原锅炉水位控制系统作为对象在锅炉水位内自动锅炉汽包水位控制系统的建立当前锅炉自动控制中的数学模型系统。

In the formula 1: h is the height of the drum water level; TW is the time constant of the water flow; TD is the time constant of the steam flow; KD is the magnification of the steam flow;

式中1:h为汽包水位高度,TW是水流的时间常数；TD是时间.蒸汽流量常数；KD是蒸汽流量；

KW is the magnification of the water flow; T1 and T2 are the time constant

KW 是水流的放大倍数；T1和T2是时间常数

UD = Delta;D/ DMAX UW = Delta;W / DM (2)

We can see that the disturbance of the drum water level changes is mainly steam flow(called external disturbance) and water flow (called within disturbance). But the measurement feedback of the boiler automatic control system is drum water level of the outside balance container. The internal and external water deviation is bigger because of the changes in temperature and pressure. On the basis of automatic control system and strong composed of water level is difficult to achieve high precision anti-interference ability. The project team carried on the long-term research and practice on boiler water level automatic control and developed the superior performance of the system. According to the problems we successfully developed the new balance container which is closer to the theoretical model, really reflect the drum water level within. At the same time, we used the robust design method.

我们可以看到汽包水位的扰动 变化主要是蒸汽流量（称为外部扰动）和 水流（称为扰动）。但是测量锅炉自控系统反馈为汽包水平容器的水平。内部和外部由于温度的变化，水的偏差更大。和压力。基于自动控制系统而强组成的水位很难达到高精度的抗干扰能力。项目组继续锅炉水位的长期研究与实践自动控制和开发了优越的性能 系统。根据我们成功的问题开发了新的平衡容器，更接近理论模型，真正反映了汽包内水位。同时，我们采用了鲁棒设计方法.

B. The Advantage of the New Bolier Automatic Control System

新型玻化炉自动控制的优点系统

According to the control system theory, the system robustness is to make the system low sensitivity. For the single loop control system, such as:

根据控制系统理论，系统稳健性是使系统的灵敏度较低。对于单身回路控制系统，如：

The system transfer function:

系统传递功能：

M = Y (s) / R (s) = G (s) (3)

The system sensitivity function:

系统灵敏度功能：

(4)

The system error function:

系统错误功能：

(5)

Through the analysis and comparison, to obtain low sensitivity and narrowing the deviation, when G (s) is constant, the system only improves the sensitivity of H (s). According to the compressibility of the image function and image primitive function in the fluid process, in the liquid level system as long as compressed the physical dimensions of the double chamber balance container we will get the desired system of low sensitivity and feedback channel of high sensitivity and high gain. So it is not hard to see that this system not only gets low sensitivity but also narrows system deviation

Project team design of the boiler water level control system with the technology of variable-frequency regulating speed, through adjusting water flow rate of variable frequency pump, we can save energy.

通过分析比较，得出灵敏度和缩小偏差，当G（s）不变时,系统只提高H（S）的灵敏度。根据图像函数与图像原语的可压缩性 在流体过程中发挥作用，在液位系统中只要 压缩后双腔的物理尺寸平衡容器我们将得到所需的低系统高灵敏度高反馈通道增益。所以不难看出，这个系统不仅会变低灵敏度，但也缩小了系统偏差 锅炉水位控制系统项目组设计采用变频调速技术，通过调节变频泵的水流量，我们可以节约能源。

III. APPLICATION EFFECT

应用效果

We transformed a steam boiler automatic control system by application above technical for one company in tianjin. Former boiler not only used for many years but also the load properties and requirements also had very big ch

资料编号：[3737]