Shaoguan Smelter Thermoelectric Branch Fluidized Bed Boiler Control System

Circulating Fluidized Boiler, CFB, is a clear coal technology. In case of its low-pollution, wide fuel adaptability and high combustion efficiency, CFB is widely used. From theory and practice, the study of CFB is a necessary work.This paper analyzes the product process firstly, and draws the conclusion that CFB is a complicated system that has characteristic of multi-parameters, non-linear, time-change and parameter coupling. The ideal control system is mufti-loop. When a parameter of system is pretreated, the other control parameters should work coordinately. However, this control is difficult. At present, some assumptions have been done in the engineering. The control system of CFB includes many son control system. And in these systems, the combustion control system and the liquid location of steam beam control system are important.From analysis of the perform characteristic of combustion system, we conclude that the difficult of combustion system lies in each other's influence. This paper aims at controlling steady of temperature firstly and maintaining stability of main vapor pressure secondly. Compensatory solve coupling control method is used. And expert judgment is adopted in the system. The fuzzy control is added in the system. And according to the errors of main vapor pressure and change of it, the range of control amount is changed. All these methods improve the system quality and solve the problem of strong coupling. The practical curve shows it's useful.The reason of deceived liquid location is detected by analyzing thestream beam perform characteristic. The traditional control algorithm isn't fit for the real working site. Based on the worker's experience, this paper proposed the method of expert PID expert control. Practical curve show this control algorithm is efficient.At last, the paper introduces the implementation of hardware and software. This work secures the successful control of CFB.