Parabola-Based Flue Gas Temperature Modeling and Its Application in BTP Control of a Sintering Process

Abstract

It is very important to predict the accurate position of the burning through point (BTP) in the sintering process. When BTP is controlled accurately, the energy consumption in the sintering process can be reduced greatly. Although BTP cannot be measured directly, we can measure the flue gas temperature to predict BTP. When the flue gas temperature of the twenty-third bellow is controlled at 600 °C, BTP will be controlled on the center of the twenty-third bellow. In this case, the sinter mix can be converted into the sinter ore with the maximum conversion rate. A method of modeling the flue gas temperature based on parabola is discussed in the paper. By means of the least square method (LSM), the relationship between the flue gas temperature and the negative pressure is modeled. The position of the burning through point (BTP) can be controlled by adjusting the negative pressure of the motor which can be controlled by adjusting the duty cycle. By comparing the measured flue gas temperature with the set temperature and comparing the measured negative pressure with the set negative pressure, the fuzzy controller with 81 rules can output the appropriate duty cycle which can control the motor properly. The flue gas temperature of the twenty-third bellow is checked so that the real position of the burning through point can be obtained. Simulations show that the position of the burning through point in the sintering process can be controlled exactly.