Intelligent adjusting method for air convection in induction furnace during online-moving heating of steel plate

Abstract

The invention discloses an intelligent adjusting method for air convection in an induction furnace during online-moving heating of a steel plate. Firstly, the steel plate enters the heating induction furnace through a furnace front roller bed and is heated in the induction furnace, and an air flow detecting device of an air flow detecting and adjusting system mounted on the inner surface of an upper inductor is used for detecting air flowing in the induction furnace in real time and sending detection data to an intelligent processing unit; secondly, the intelligent processing unit is used for working out the air flowing direction and strength in the induction furnace according to the detection data and working out the air flow rate and the acting direction needed for counteracting air flowing, and worked-out results are sent to a PLC control system; thirdly, the PLC control system gives out adjusting commands to an air blowing device of the air flow detecting and adjusting system, and the adjusting commands include the air flow rate command and the air flow direction command; and fourthly, the air blowing device carries out real-time air-blowing adjustment, so that air convection in the furnace is lowered to an allowed range.

Description

Technical field [0001] The invention relates to a control method for an on-line mobile heating induction furnace for steel plates, in particular to a method for regulating air convection in the induction furnace, and is suitable for thermomechanical control technology of medium and thick steel plates. Background technique [0002] With the advancement of science and technology, the scope of material applications continues to expand, and people’s requirements for material properties are becoming more and more stringent. Thermomechanical Control Process (TMCP) has an important influence on the properties of materials. It can realize the production of steel plates with special properties, such as those with excellent welding properties. High-strength steel, steel for high-rise buildings and steel for large ships, etc., can greatly improve the quality of thick plates, and have a significant impact on the performance of thick plates. At present, the latest thick plate TMCP technology ...

AI Technical Summary

Problems solved by technology

[0003] When the steel plate moving continuously on the line is heated in the induction furnace, it may drive the air flow and form air convection in the furnace, especially when the steel plate moves fast, it will promote the heat dissipation on the surface of the steel plate, resulting in a large amount of heat loss

In addition, due to the difference in the moving speed of steel plates of different specifications, the air convection intensity will also change, and the degree of cooling at different positions on the surface of the steel plate will be uneven, resulting in uneven temperature distribution of the steel plate, which will lead to unstable performance of the steel plate, serious Sometimes there will be deformation of the steel plate, which will affect the product quality and increase the follow-up processing procedures, resulting in an increase in production costs.

At present, the method of suppressing air convection in the furnace mainly adopts sealing measures to reduce the inflow and outflow of air in the furnace as much as possible. This measure is suitable for the heating of stationary steel plates, or long continuous steel plates or steel strips. First, the steel plate frequently enters and leaves the induction furnace, and the steel plate has a certain degree of warpage, so the sealing measures at the inlet and outlet of the inductor are difficult to meet the process requirements, and it may also cause the collision between the steel plate and the sensor or sealing device at the entrance and exit. Conducive to the smooth flow of the process

[0004] According to literature and patent searches, the TMCP induction heating furnace adopted in Japanese patents JP2004074277A, JP2002226912A and JP2003082412A did not consider the influence of air convection on steel plate heating

In the existing TMCP induction heating device, there is no report on the real-time adjustment technology of air convection in the induction furnace

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