In recent years, with continuous research and development of high-efficiency energy-saving drying technology and high-fine and high-production fine crusher equipment, it has become possible to industrialize the production of high-fineness, high-slurry slag micropowder.
Due to the large amount of heat generated during the grinding of the slag powder in the ball mill, the moisture in the raw material slag is easily spilled, resulting in paste balls and clumping, which seriously affect the grinding efficiency and power consumption. Therefore, the water content of the ground slag is applied to the slag powder. The grinding effect is very sensitive, so in the existing process system, it is required to strictly control the moisture content of the ground slag to be less than 0.5 to 1.0%. For the use of high-fine, high-yield milled slag powders, in order to achieve high fineness, high specific surface area, and high and low power consumption, the determination of ball mill structure parameters and process parameters plays a decisive role, ie, the position of the ball mill The appropriate choice of setting, silo plate, discharge sampan plate, lining plate and grinding body grading will be reflected by the output, fineness and specific surface area of the table. At the same time, it also directly affects the slag powder finished product gradation.
There are many input and output variables in the milling system of the beneficiation equipment ball mill. If the entire milling system is designed as a whole multivariable control system, the entire design process and control algorithm will be very complicated. Therefore, we must divide it into several relatively independent subsystems according to the specific characteristics of the milling system. First of all, from the analysis of the dynamic characteristics of the ball mill, it can be seen that the hot air volume and the cold air volume have a significant influence on the inlet vacuum pressure and the outlet temperature of the ball mill. Therefore, this process can be regarded as a 2×2 multivariable object with two input volumes. They are the hot air door opening and the cold air door opening respectively. The two input variables are the inlet pressure and the outlet temperature of the ball mill inlet of the ore processing equipment. For this multivariable object, a multivariable fuzzy control system will be designed.
In addition, because the load of the ball mill is a relatively independent system, and the biggest problem of this system is that the measured quantity cannot be measured accurately, and the closed-loop control system cannot work normally. In response to this feature, this chapter proposes an optimized adaptive open-loop control method based on minimizing the power consumption of the pulverizing system, thereby avoiding not only measuring the ball mill load, thus ensuring that the pulverizing system operates in a more energy-saving state. .
For the control of the outlet of the powder extractor (boiler primary air pressure), it should be said that it is a typical loop control system, but due to the switch of the outlet of the powder collector and the downwind process, the effect on the discharge pressure of the powder discharger is very great. Large, but the actual operation requires that the outlet pressure of the powder discharger should be balanced to avoid unstable combustion of the boiler. The conventional PID control system is difficult to meet the actual control requirements. Based on this, this chapter researches and proposes a fuzzy-PID hybrid control system, which effectively improves the anti-jamming capability of the control system and ensures that the outlet pressure of the powder discharge machine is within the specified range
