Real-time online monitoring method of temperature of molten steel in RH refining furnace

Abstract

The invention discloses a real-time online monitoring method of temperature of molten steel in an RH refining furnace. An infrared detector arranged at the top of the RH refining furnace is used to acquire infrared thermograms of the molten steel, slag, a wall and scale in a target area, to be measured, in the RH refining furnace; through theoretical analysis on radiation features of the molten steel, the slag, the wall and the scale, the interior conditions of the RH refining furnace and wave characteristic of the molten steel, the infrared thermograms are processed by fuzzy C-means clustering and threshold segmentation, the infrared thermogram of the target molten steel is determined, a target positive radiation area is determined, average grey level of the target positive radiation area is calculated and converted into infrared spectral radiation intensity of the target molten steel, and the temperature of the molten steel is calculated by a molten steel temperature measuring principle model and an iterative inversion algorithm. The method has the advantages that the temperature of the molten steel can be measured continuously in real time, resource waste is greatly decreased, labor intensity is greatly decreased for workers, production guidance and implementation of optimal control are favored, and scientific steelmaking and precision steelmaking are achieved.

Description

technical field [0001] The invention relates to the related fields of molten steel refining and nonferrous metal smelting in the metallurgical industry, in particular to a real-time on-line monitoring method for the temperature of molten steel in an RH refining furnace. technical background [0002] Temperature is one of the key process parameters that need to be controlled in the steelmaking process. Appropriate molten steel temperature is an important prerequisite to ensure the quality of continuous casting slabs. Excessively high molten steel temperature will not only easily cause accidents such as leaking and overflowing steel, but also increase the number of inclusions in the steel, easily cause internal cracks in the slab, and affect the quality of the slab; molten steel with too low temperature has poor fluidity and is easy to block the nozzle. The recovery rate is high. In order to ensure that the temperature of molten steel in the pouring process of steelmaking is ...

AI Technical Summary

Problems solved by technology

[0007] The present invention solves the difficult problem in the real-time online monitoring of the molten steel refining temperature in the RH furnace by identifying and distinguishing the substances in the furnace and extracting effective molten steel targets, and the measured real-time temperature of the molten steel is fed back to the optimization control system in time, thereby Guide operations such as powder spraying, aluminum addition, decarburization, and deoxidation, and overcome the problems of hysteresis, waste of resources, high labor intensity, low safety factor, and reliance on empirical judgment of other existing methods

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