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Automatic distinguishing control method for maximum heating temperature of steel rolling heating furnace

A technology of heating temperature and control method, applied in the field of steel rolling, can solve problems such as reducing productivity, affecting production rhythm, and lacking better management methods, and achieves the effect of improving product quality and realizing fine control.

Active Publication Date: 2020-01-07
ZHANGJIAGANG POHANG STAINLESS STEEL
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  • Application Information

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Problems solved by technology

In the existing technology, when switching between different steel grades and specifications with large differences in maximum heating temperature requirements, the common practice is to leave a certain length between blanks of different steel grades and specifications to achieve the purpose of temperature transition, but this method affects The production rhythm reduces the productivity; there is no better management method when switching between different steel grades and specifications with small differences in maximum temperature requirements

Method used

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  • Automatic distinguishing control method for maximum heating temperature of steel rolling heating furnace
  • Automatic distinguishing control method for maximum heating temperature of steel rolling heating furnace
  • Automatic distinguishing control method for maximum heating temperature of steel rolling heating furnace

Examples

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Embodiment 1

[0022] In this implementation, 20 billets are selected for testing, the first 10 are 304 steel billets, and the last 10 are 316L steel billets. Taking the last burner control area of ​​the last section of the heating furnace as an example, the second-stage combustion control system of the heating furnace calculates the initial temperature setting T 0 = 1253°C. According to process requirements, the maximum heating temperature requirement of 304 steel grade is artificially given T im(304) =1245℃, 316L steel grade maximum heating temperature requirement T im(316L) = 1240°C. When the burner control area is all 304 steel:

[0023] T limit(304) =Σ(α i* T im(304) ) / Σα i =Σα i / Σα i *1245=1245℃;

[0024] According to the formula T final =min(T 0 , T limit(304) )

[0025] Get T final(304) =min(1253,1245)=1245℃

[0026] In the same way, when the burner control area is all 316L steel:

[0027] T limit(316L) =Σ(α i* T im(316L) ) / Σα i =Σα i / Σα i *1240=1240℃;

[0028] According to the fo...

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Abstract

The invention discloses an automatic distinguishing control method for the maximum heating temperature of a steel rolling heating furnace. The method is characterized in that a second-stage combustioncontrol system of the heating furnace utilizes a thermodynamic model, and a temperature setting initial set value T0 is calculated according to a steel type component, a size specification, a charging temperature, a target tapping temperature and a predicted residence time parameter of a steel billet; and a maximum heating temperature limiting step is set, particularly, a burner i control area S0is defined, a maximum heating temperature weight coefficient alpha i of the steel billet I is defined, the maximum heating temperature Tlimit at the burner I is calculated, T0 is compared with Tlimit, the smaller value is taken as as Tfinal, and Tfinal is used as the final set value of a PID controller corresponding to the burner to carry out temperature control. The method has the beneficial effects that the limitation of the maximum heating temperature of steel grades can be automatically realized under the conditions that the furnace is not empty, the production rhythm is not influenced and manual intervention by operators is not needed, fine control of the production process is realized, and the product quality is improved.

Description

Technical field [0001] The invention belongs to the field of steel rolling, and relates to an automatic differentiation control method for the maximum heating temperature of a steel rolling heating furnace. According to the actual layout of the billet, the maximum heating temperature of each area in the heating furnace is differentially controlled to meet the heating process requirements of different steel specifications. Realize flexible control and reduce slab surface defects. Background technique [0002] Heating furnace heating is the first process of hot rolling project. The purpose of heating furnace heating is to heat the billet to a uniform temperature suitable for rolling, improve the plasticity of the billet, and reduce the deformation resistance, so that the subsequent rolling mill can use a larger reduction when rolling, and improve the productivity and operation of the rolling mill rate. The uniformity of the heating temperature is a sign of the heating quality. If...

Claims

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Application Information

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IPC IPC(8): C21D9/70C21D11/00
CPCC21D9/70C21D11/00
Inventor 居清范丽芳徐真军顾海峰
Owner ZHANGJIAGANG POHANG STAINLESS STEEL
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