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Method for forecasting temperature of slab of hot rolling heating furnace

A technology for heating furnaces and slabs, applied in temperature control, heat treatment furnaces, furnaces, etc., can solve the problems of cumbersome and complex calculations, and achieve the effects of simple calculation process, enhanced extensiveness, and improved forecasting accuracy

Inactive Publication Date: 2010-10-27
SHANGHAI BAOSIGHT SOFTWARE CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This method realizes the prediction of the slab temperature of the hot-rolled slab heating furnace through the method of summarizing the heat absorption rate and using the difference equation. The disadvantage is that the calculation is complicated and has certain limitations.

Method used

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  • Method for forecasting temperature of slab of hot rolling heating furnace
  • Method for forecasting temperature of slab of hot rolling heating furnace
  • Method for forecasting temperature of slab of hot rolling heating furnace

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Experimental program
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Embodiment Construction

[0037] The method of the invention mainly predicts the heating curve of the billet in the furnace and the temperature out of the furnace through intelligent optimization.

[0038] Difference equations for one-dimensional unsteady heat transfer

[0039] ∂ 2 T ∂ x 2 = 1 a ∂ T ∂ τ (Formula 1),

[0040] Partial derivative of temperature versus time Forward difference quotient, second order partial differential quotient of temperature versus distance The central difference quotient yields the difference equation:

[0041] (Formula 2)

[0042] In formula 1, T represents the temperature value of the billet, x is the coordinate in the thickness direction, τ is the time coordinate, and a is the thermal physica...

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Abstract

The invention discloses a method for forecasting the temperature of a slab of a hot rolling heating furnace, comprising the following steps of: firstly, carrying out simplified hypothesis on heat transfer of radiation; secondly, drawing a grid division diagram on a one-dimensional unsteady heat transfer problem, dividing a billet into 8 layers i.e. 9 nodes, and obtaining explicit difference equations with 9 nodes by utilizing a one-dimensional unsteady difference equation; and thirdly, determining an unknown thermal property coefficient f by adopting a genetic algorithm, and forecasting a temperature value of a next time by the explicit difference equations based on a temperature value of each node of a last time after determining the unknown thermal property coefficient f. By adopting the invention, the billet tapping temperature in a heating furnace can be accurately forecasted, and the tediousness and the complexity of calculation can be simplified.

Description

technical field [0001] The invention relates to a method for forecasting the slab temperature of a hot rolling heating furnace. Background technique [0002] The heating furnace is one of the key equipment of the steel rolling production line, and it is also the main energy-consuming equipment, which has the characteristics of nonlinear, time-varying and distributed parameters. The quality of billet heating directly affects the quality, output, energy consumption and life of the rolling mill of steel. Billet surface temperature and center temperature are the main quality indicators of billet heating. However, in actual industrial production, people cannot directly measure the temperature distribution of the moving billet in the furnace, and can only calculate the temperature of the billet in the furnace through various mathematical methods. The temperature distribution in the billet heating furnace, especially the temperature difference between the billet surface temperatu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21B37/74C21D9/70
Inventor 赵忠雷
Owner SHANGHAI BAOSIGHT SOFTWARE CO LTD
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