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Control method for restart of strip steel processing line furnace area after shutdown

A technology for processing lines and steel strips, applied in heat treatment process control, heat treatment furnaces, heat treatment equipment, etc., can solve problems such as strip pleats, broken strips, and major accidents

Active Publication Date: 2015-11-11
通用电气(武汉)自动化有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

After the processing line unit stops, because the strip steel still stays in the high-temperature annealing furnace, the annealing time is longer, and the strip steel becomes soft. When restarting at this time, it is very easy to pleat the strip steel or even break the strip directly. ACCIDENT

Method used

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  • Control method for restart of strip steel processing line furnace area after shutdown
  • Control method for restart of strip steel processing line furnace area after shutdown
  • Control method for restart of strip steel processing line furnace area after shutdown

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Embodiment

[0023] Embodiment: a control method for restarting after shutdown of the furnace area of ​​a strip processing line, characterized in that: the annealing furnace is composed of a preheating section, a heating section, a soaking section, a cooling section, an overheating section, and a final cooling section. For different working conditions, the normal production process setting value is multiplied by a certain tension reduction coefficient,

[0024] The tension reduction coefficient depends on the working condition K of the strip and the section of the annealing furnace: Tij=Qij*Tijpreset,

[0025] Wherein: i=state (K0, K1, K2 or K3);

[0026] j=section (inlet preheating section, heating section, soaking section, cooling section, superheating section, final cooling section);

[0027] Tij = reduced tension setting value;

[0028] Qij = tension reduction coefficient;

[0029] Tijpreset = tension setting value during normal production stipulated by the process,

[0030] The st...

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Abstract

The invention discloses a control method for restart of a strip steel processing line furnace area after shutdown. The control method is characterized in that an annealing furnace comprises an entrance preheating section, a heating section, a soak section, a cooling section, a superheating section and a final cooling section, and a process set value of normal production is multiplied by a certain coefficient according to different work conditions, so that the purpose of speed and tension reduction is achieved. The control method has the benefits that overburnt strip steel passes through the annealing furnace smoothly, strip breakage and hot waved surfaces of the strip steel in the annealing furnace are reduced or prevented as far as possible, and a unit can recover the normal production rapidly and stably.

Description

technical field [0001] The invention relates to the field of strip steel processing line control, in particular to a control method for restarting after shutdown of the furnace zone of the strip steel processing line. Background technique [0002] The cold-rolled sheet continuous annealing production line has developed rapidly in recent years due to the characteristics of short production cycle, high unit output, wide range of varieties, stable production, high quality and high efficiency. Today's competition among cold-rolled strip industries is more reflected in how to improve The follow-up unit of the rolling mill—in terms of the quality and efficiency of strip steel production in the continuous annealing furnace, among them, the reduction or avoidance of strip breakage and hot buckling of the strip steel in the annealing furnace, and the improvement of the stability of strip steel production and operation in the continuous annealing furnace have been discussed. It is mor...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D11/00C21D9/56
Inventor 刘新奇陈威欧阳诗卉赵凯刘沛迪杨天贵肖银平尹幼华邓云露
Owner 通用电气(武汉)自动化有限公司
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