Heating furnace steel billet temperature calculation method based on time domain convolution model

Abstract

The invention relates to a heating furnace steel billet temperature calculation method based on a time domain convolution model, and belongs to the technical field of steel rolling. Firstly, a two-dimensional heat transfer mechanism model of a steel billet is established based on a basic principle of heat transfer theory, and temperature distribution of the steel billet is calculated in real time; secondly, the steel type, the size, the in-furnace time, the hearth temperature and the steel billet temperature calculated by the mechanism model are collected, a characteristic data set is formed with the steel billet temperature measured by the infrared thermometer, and data is preprocessed. and finally, a steel billet temperature correction model is created based on a time domain convolution model of a deep learning theory, the model is trained by using the data set, and the temperature of the steel billet is corrected in the furnace by using the trained model. Compared with a traditional method, the time sequence model of the billet temperature is established through deep learning, the influence of all feature data on the billet temperature is fully considered, the real-time billet temperature is calculated more accurately, and the calculation precision and adaptability of the model are improved.

Description

technical field [0001] The invention belongs to the technical field of steel rolling, and relates to a method for calculating the temperature of a billet in a heating furnace based on a time-domain convolution model. Background technique [0002] The heating furnace is an important equipment in the hot rolling production line. Its main function is to heat the billet to the temperature required for rolling. Whether the temperature of the billet meets the requirements seriously affects the quality of rolling. Therefore, it is very important to accurately calculate the real-time temperature of the billet. The temperature rise process of the billet in the heating furnace is a complex nonlinear process, which has the characteristics of strong coupling, large inertia, hysteresis and time-varying characteristics. Establishing an accurate and highly applicable billet temperature calculation model is to meet the requirements of the rolling process and improve A necessary condition fo...

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Problems solved by technology

[0003] At present, the calculation method of billet temperature in heating furnace can be roughly divided into two types. One is based on the mechanism model of heat transfer and discretely solved by numerical method. Because the heating process is very complicated, it is difficult to accurately measure relevant parameters and establish calculation accuracy. High and adaptable mechanism model; the second is a statistical model based on a large number of experiments and industrial data, its adaptability is limited, and its application effect is general in complex working conditions with multiple steel types and multiple target temperatures

[0004] In order to solve the problem of inaccurate real-time billet temperature calculation results, relevant domestic patents have corrected the calculation results on the basis of the mechanism model, such as the patent of authorization number CN105045948B "A Modeling and Online Calibration of Billet Temperature in a Walking Heating Furnace Method", using the method of sensitivity analysis to correct the equivalent heat transfer coefficient. This method establishes the linear relationship between the equivalent heat transfer coefficient and the predicted value of the billet temperature, but the actual situation is often complicated, and the simple linear relationship cannot be accurately described, resulting in Poor model adaptability and inaccurate results

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