Ball mill http://www.ldqmj.com/ as one of the major milling equipment, with grinding the advantages of more coal, high reliability, long life time, maintaining a small amount, have been widely used power plant. The ball mill pulverizing system is a typical multivariable nonlinear time-varying systems, there are quite serious of coupling between the control and charged, these factors make the design based on classical PID control program over the years almost no one normal operational. Even if we put part of the automatic, it is difficult to ensure that the coal mill in the best conditions, that is difficult to ensure the mill's output to large and milling power consumption requirements of low. So a long time, the ball mill has been using a manual control. How to effectively achieve the automatic control and optimize the operation of this equipment has important theoretical and practical significance. 

 This paper focuses on aspects of the following ball mill: 

 This article describes the theoretical basis of fuzzy control, the structure and principles of the fuzzy controller and fuzzy controller design process. Briefly describes the working principle of ball mill pulverizing system, control the status of the domestic milling system, a brief introduction of fuzzy control history and the status quo, and fuzzy control in power plant thermal production process control applications. 

 2, this paper studied the object of the ball mill pulverizing system characteristics and the dynamic mathematical model. Milling system from the coal mill hot air doors, cold door, to the amount of coal to the coal pulverizer into the product of negative pressure, outlet temperature and the coal mill load step response characteristics, multivariate milling system, the strong coupling characteristics made a detailed analysis. 

 3, according to the specific characteristics of the milling system, this paper will be divided into several relatively independent subsystems. Have a significant impact on the amount of hot air and cold air on the ball mill products into the negative pressure and outlet temperature, can this process as a 2 * 2 multi-variable objects, the two inputs, respectively, for the hot air tone of opening and the cold tone of the opening of the two output variables, respectively, for the coal mill entrance negative pressure, the outlet temperature. In response to this multi-variable objects, the design of a multivariable fuzzy control system. The fuzzy control system is divided into two, the first level is composed of two fuzzy controllers, the second stage is fuzzy decoupling algorithm, lifting the multivariable coupling between the final hot air door, cold door opening instructions. Using the same method to solve the row of the powder inlet negative pressure and inlet temperature control problems. 

 4, due to the load of the ball mill is a relatively independent system, while the system's biggest problem is to adjust the amount of accurate measurement, closed-loop control system does not work. This feature, this chapter, the minimum power consumption based on the milling system optimization of open loop control method, not only to avoid the ball mill load measurement, thus ensuring the pulverizing system work in a more energy-efficient state. 

 For the control of the row of the powder outlet pressure (boiler primary air pressure), should say that it is a typical single-loop control system, but because of the Mill Exhauster export manual door switch and down wind outlet pressure of the Mill Exhauster a great influence on the actual operation requires exclusive powder machine outlet pressure to be smooth to avoid boiler combustion instability. Conventional PID control system is difficult to meet the control requirements Accordingly, the fuzzy-PID compound control system, improved anti-jamming capability of the control system to ensure that the row of powder outlet pressure specified within. 

 6, Shanxi Thermal Power Plant # 5 Unit Milling system as an example to discuss the programmed start and stop the design of milling system, thermal power plant in Shanxi ball mill pulverizing system since the programmed start and stop function input, run five teams and groups all programmed start and stop to start or stop the running of the milling system. Greatly reducing the labor intensity of the operating personnel, to improve the safety and reliability of the milling system is running. 

 In this paper a detailed analysis of the characteristics of the mill http://www.ldqmj.com/jienengqiumoji.html milling system, put forward some new ideas and methods to control and optimize the operation of the ball mill pulverizing system.