On-line thermal monitoring system of heat transfer symmetry of crystallizer copper pipe and method thereof

Abstract

The invention belongs to the technical field of steelmaking continuous casting, and relates to an on-line thermal monitoring system of heat transfer symmetry of a crystallizer copper pipe on a continuous casting machine. The system comprises the crystallizer copper pipe which can monitor the heat transfer symmetry, a temperature data collection and storage module and an industrial control computer. The on-line thermal monitoring system is characterized in that a plurality of temperature measuring elements are embedded at the back of the copper pipe, and the temperature measuring elements are distributed in a 'cross' shape and in a symmetrical form based on the central section of the copper pipe. The invention comprehensively utilizes on-site actual measuring data and a computer numerical simulation technology, researches the heat transfer symmetry of a crystallizer by monitoring the surface temperature of the copper pipe, determines longitudinal distribution of heat flow of the crystallizer according to the transient heat flow calculated by the temperature of the copper pipe, calculates the temperature field of a continuous casting billet and the shell thickness of a solidification billet through a heat transfer mathematical model, and finally compares the situation of symmetrical surfaces. The invention can provide a basis for structural design of the crystallizer copper pipe and production process optimization of the crystallizer so as to promote the continuous casting billet to uniformly grow in the crystallizer.

Description

technical field [0001] The invention belongs to the technical field of steelmaking and continuous casting, and relates to an on-line thermal monitoring system and method for the heat transfer symmetry of copper tubes of crystallizers on billet and round billet continuous casting machines. Background technique [0002] As the heart of the continuous casting machine, the mold has an important influence on the continuous casting productivity and the quality of the continuous casting slab. The surface quality of the continuous casting slab mainly depends on the solidification process of the molten steel inside the mold. Surface cracks and most of the breakout accidents are caused by the asymmetric and uneven cooling of the continuous casting slab in the mold. This is because, after the molten steel enters the crystallizer, it begins to crystallize and solidify in the meniscus area to form an initial billet shell. The unbalanced cooling conditions will cause the growth speed of t...

AI Technical Summary

Problems solved by technology

[0009] In order to study the solidification of molten steel in the crystallizer, metallurgists have established a large number of mathematical models for the solidification and heat transfer of continuous casting slabs due to the limitations of detection methods. However, due to the geometric symmetry of continuous casting slabs, only 1 / 4 or 1 / 8 continuous casting slab section is used as the calculation domain, so the simplification is the default assumption that the solidification state of the slab is always symmetrical, which is obviously inconsistent with the actual situation

Moreover, the heat flow calculations involved in the boundary conditions calculated by the mathematical model mostly come from the empirical formulas summarized by the predecessors, which are not specific and will greatly reduce the calculation accuracy

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