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The Study of the Intelligent Control of Chemical Feeding System Suiting for the Medium and Small Sized Boiler

Author: QianHua
Tutor: ZuoYanNian
School: Suzhou University
Course: Mechanical Engineering
Keywords: Time Delay Boiler Dosing Fuzzy Adaptive Control MATLAB simulation
CLC: TP273.5
Type: Master's thesis
Year: 2009
Downloads: 45
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Abstract

Boiler feed water dosing system to water quantity, water quality, dosage, dosing point position, the drug concentration in the dosing process changes of process parameters will impact feedwater dosing control system. Therefore, the boiler dosing system is a typical delay of control systems, control strategies and controller to optimize the control is very important. Experts at home and abroad over the years a lot of research for boiler feed water dosing system control strategy and controller control problems, made a series of achievements, control methods such as differential forward, Smith estimated, and PID control is applied to the boiler feed water dosing system. However, these advanced control methods in the small and medium sized boiler feed water dosing control applications, boiler feed water dosing control system with large time delay, nonlinear, time-varying special permit, so the system control parameter adjustment process of the pursuit of the most excellent control will result in boiler feed water dosing control process to adjust the length of time, chemical dosage, low production efficiency. In this paper, the problems of boiler feed water dosing control system, through domestic and foreign boiler dosing system control method, the spirit, intelligent, reliable, and affordable, a suitable control of the a small boiler feedwater dosing Fuzzy adaptive control strategies and methods. Control strategy and fuzzy adaptive PID controller is more in-depth study and exploration, research and design one for small and medium-sized boilers intelligent dosing system controller \simulation study. This thesis is divided into six chapters, the main contents are as follows: Chapter 1 Introduction This chapter is a Master of the paper. This chapter has introduced the significance of the subject source and research, boiler feed water at home and abroad dosing system control method of the status quo, and pointed out the difficulty in research, and basically solved the idea to establish the content and direction of research in this topic. The second chapter of the boiler dosing system control program design This chapter begins by conventional control methods of delay analysis of boiler feed water dosing control process and the existing boiler feed water dosing system (differential forward the, smith estimate) study, analysis of these The control of the advantages and disadvantages of the method. Dosing system, boiler feedwater, the the Smith Predictor optimal control, based on the internal model control PID control and incremental PID control three options. Comparative analysis of the three programs, in line with the cost-effective, stable and reliable control principle, the final establishment of a suitable fuzzy adaptive PID control intelligent control programs in small and medium-sized boiler dosing system. Chapter control strategy is designed based on established design, the control method fuzzy adaptive PID control theory study and research, boiler feed water dosing intelligent control for boiler feed water dosing requirements, study design control strategy, laid the theoretical foundation for the design of intelligent controllers. Chapter fuzzy adaptive controller design in this chapter based on the boiler feed water dosing smart control requirements by the fuzzy rules, membership function, fuzzy controllers, and intelligent control strategies, design a suitable, small boilers water supply fuzzy adaptive controller dosing. Chapter simulation study in order to better verify the theoretical research, the subject small boilers research design intelligent dosing system controller using MATLAB the simulation study, has the delay time of the step response of the control system, the inertia of the system static gain, external interference analysis further validated this topic intelligent controller design advanced, reliability and applicability, laid the theoretical and simulation experimental basis for the practical application of the intelligent controller. Chapter Summary and Outlook This chapter has the main content of the research, innovation and the problems were reviewed and summarized, and the subject of future research prospects. The main innovations of the topics: (1) the existence of the problem for the small boiler feed water dosing control system, through research, put forward an economic and reliable boiler dosing system control method. (2) was constructed to apply to have a big lag, nonlinear, time-varying characteristics of small and medium-sized boiler feed water dosing system fuzzy adaptive PID control strategies. (3) design a suitable small boiler feed water dosing fuzzy adaptive controller and through simulation experiments laid the theoretical and simulation experimental basis for the practical application of the intelligent controller.

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