Water temperature compensation method for improving strip steel coiling temperature control precision in laminar cooling

Abstract

The invention discloses a water temperature compensation method for improving strip steel coiling temperature control precision in laminar cooling. The method comprises the following steps that S1, byanalyzing historical rolling data of hot-rolled strip steel produced based on a strip steel laminar cooling model, genetic coefficient compensation reference values K under different water temperature deviations are obtained; S2, a strip steel overall genetic coefficient value X is determined based on a strip steel laminar cooling model self-learning genetic coefficient; S3, strip steel actual genetic coefficient compensation values Y (Y=K*X) under the different water temperature deviations are calculated according to the genetic coefficient compensation reference values K and the strip steeloverall genetic coefficient value X; S4, actual genetic coefficient values of each section of strip steel under the different water temperature deviations are calculated according to the strip steelactual genetic coefficient compensation values, wherein the actual genetic coefficient value of each section of the strip steel under the different water temperature deviations equals to the sum of the genetic coefficient value of each section and the strip steel actual genetic coefficient compensation value; and S5, the boiled water amount of the strip steel laminar cooling model is controlled according to the actual genetic coefficient value of each section of the strip steel. The method is simple and reliable, the stability of coiling temperature control is ensured, and the production costis reduced.

Description

technical field [0001] The invention belongs to the technical field of hot-rolling temperature control of strip steel, and in particular relates to a water temperature compensation method for improving the temperature control accuracy of hot-rolled strip coiling. Background technique [0002] The coiling temperature of hot-rolled strip steel must meet certain technological requirements. If the coiling temperature is too high or too low, it will have a negative impact on the structure and properties of the strip steel. The control accuracy of the coiling temperature is a reflection of the control level of the hot rolling production line. one of the important indicators. At present, various mathematical models with laminar cooling temperature control as the core have been researched at home and abroad. According to the characteristics of laminar cooling, the mathematical models can generally be divided into temperature setting units, feedforward control units, feedback control...

AI Technical Summary

Problems solved by technology

[0007] However, the existing hot-rolled strip coiling temperature control method still has the defect of inaccurate control accuracy. The main reason is that due to the different layers of the strip, the water required for the strip and the genetic coefficient vary greatly. The strip steel with a small genetic coefficient itself has high rolling water temperature and low water temperature for learning strip steel. The model compensates the coefficient on the basis of learning the strip steel genetic coefficient, which may cause too much water and low temperature.

On the contrary, for the strip steel with small genetic coefficient itself, the rolling water temperature is low, and the learning strip steel water temperature is high. After the model compensates for a coefficient, the water volume may be too small and the coiling temperature may be high.

At the same time, for some steel strips with large genetic coefficients, due to their large genetic coefficients, after compensating a fixed coefficient, the compensation value has little influence on the overall genetic coefficient. Even if the water temperature varies greatly, the actual boiling water volume does not change much , resulting in abnormal coiling temperature accuracy

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