A billet temperature modeling and online correction method for a walking heating furnace

Abstract

The invention provides a method for modeling and on-line correction of the billet temperature of the stepping heating furnace. First, a simplified mechanism model of the sub-furnace zone of the stepping heating furnace is established by using the equivalent heat transfer coefficient of each furnace zone, so as to ensure the rationality of the model. At the same time, the complexity of online optimization of model parameters is reduced; then, the infrared temperature measurement value of the billet surface in the furnace is collected, and compared with the calculated temperature value of the model, the equivalent heat transfer coefficient is corrected in real time. The calibration process starts from the first furnace zone after the entrance of the heating furnace and proceeds sequentially until the last furnace zone at the exit. Compared with the traditional method, the present invention makes full use of the real-time feedback information in the production process to correct the model zone by zone, not only considers the parameter characteristics of each furnace zone independently, but also takes into account the influence of the previous furnace zone on the latter furnace zone, reducing the size of the model. The error between the model and the real system greatly improves the accuracy and adaptability of the model, and realizes accurate temperature prediction of the heating process of the billet in the furnace.

Description

technical field [0001] The invention relates to the field of modeling and control of heating furnaces for iron and steel production, in particular to a method for modeling and on-line correction of billet temperature in a walking heating furnace. Background technique [0002] The heating furnace is an indispensable thermal equipment in the steel production process. Its energy consumption accounts for about 50% of the rolling process and about 20% of the energy consumption of the entire steel production. It is a large energy consumer in steel production. Its task is to heat the billet according to the production rhythm, so that the surface temperature and internal temperature distribution of the billet meet the rolling requirements when it comes out of the furnace, and at the same time heat it evenly to avoid overheating and overburning, reduce oxidation and decarburization of the billet, and provide heating quality for the rolling mill. Excellent steel billets ensure smooth ...

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a walking heating furnace billet temperature modeling and online correction method to solve the existing walking heating furnace billet temperature mechanism model with complex model structure, numerous parameters, and lack of effective temperature models. The problem of online feedback learning mechanism, poor parameter correction effect, low prediction accuracy and poor practical application effect

[0007] The second purpose of the present invention is to provide a walking heating furnace billet temperature modeling and online correction method to solve the problem that the existing walking heating furnace billet temperature mechanism model cannot make full use of the information in the furnace for feedback correction of the model The low degree of matching between the model and the actual system caused by defects such as

Images