Sintering-end-point double-boundary compensation control method with front end point and back end point of combustion zone bottom contact section as boundaries

Abstract

The invention relates to a sintering-end-point double-boundary compensation control method with a front end point and a back end point of a combustion zone bottom contact section as boundaries. The method includes the steps that a quadratic curve is fitted with the temperature of two air bellows at the front control boundary position and the back control boundary position as base points, and the temperature value of a point where the quadratic curve and the front control boundary position are interacted serves as a predicated value; the temperature of an air bellow at the front adjustment boundary position is adjusted according to the predicted value by changing the air pressure of a main exhaust fan, and the temperature of an air bellow at the back adjustment boundary position is adjusted according to a difference value result between a temperature measured value and a set value by changing the speed of a combustion engine; and the deviation values between temperature measured values of the air bellows at the front adjustment boundary position and the back adjustment boundary position and the set value serve as parameter change factors for adjusting power, a function relation between the adjusting power and the deviation values between the temperature measured values and the set value is fitted through a neural network system, and the sintering end points can be controlled. By means of the method, the predicting accuracy of the sintering end points can be improved, and the adjusting oscillation performance of the sintering end points can be reduced.

Description

technical field [0001] The invention relates to a sintering end point control method, in particular to a sintering end point double-boundary compensation control method in which the front and rear end points of the bottoming section of the combustion zone are boundaries, and belongs to the field of automatic control of the sintering process. Background technique [0002] Accurately predicting the position of the sintering end point is the basic requirement of modern sintering production. It is of great significance to increase the output of the sintering machine and ensure the quality of sintering ore. The realization of good coordination between sintering production and waste heat power generation has put forward a new challenge for the accuracy of the sintering end point. higher requirement. However, due to the many and complex factors affecting the sintering end point, it is difficult to accurately predict and adjust the sintering end point in the actual sintering product...

AI Technical Summary

Problems solved by technology

Therefore, there is an essential difference between taking the peak point of the quadratic curve as the control target and the bottom end point of the combustion zone as the control target. Taking the peak point of the quadratic curve as the control target will lead to low forecasting accuracy and often lead to large fluctuations in regulation

[0006] 2) The peak point of the fitted quadratic curve generally deviates from the midpoint of the bottoming section of the sintered zone

[0007] The known sintering end point control method believes that the peak point of the fitted quadratic curve generally coincides with the midpoint of the bottoming section of the sintering zone, but due to the complexity of the sintering reaction, there is a large difference between the fitted quadratic curve and the actual temperature rise curve, which must In most cases, the peak point of the fitted quadratic curve will deviate from the midpoint of the bottoming section of the sintering zone, so the known sintering end point control method has a very low prediction accuracy rate, and even directional errors often occur, eventually resulting in large-amplitude oscillation adjustments the result of

[0008] 3) Difficult to adjust

[0009] The prediction accuracy of the known sintering end point prediction method is poor, and there is uncertainty in the prediction of the direction and amount of change of the sintering end point. Therefore, the adjustment guided by the known sintering end point prediction method has the characteristics of large amplitude and long-term oscillation, which makes the sintering machine The automatic adjustment of the

[0010] A large number of sintering production practices show that the known sintering endpoint prediction method does have great defects, and it is difficult to meet the requirements of modern large-scale sintering production for automatically adjusting the sintering endpoint. It is necessary to completely change the existing sintering endpoint prediction method, improve the prediction model, and fundamentally improve the prediction Accuracy, greatly reducing the shock of sintering machine adjustment

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