Technology of on-line control molten steel flow in crystallizer

Abstract

A technique for in-line controlling the flowing of molten steel in crystallizer includes such steps as using CFX software to calculate the flow field of molten steel in crystallizer and to obtain the parameters necessary to calculate F number, calculating F number according to a known equation, creating a database containing flow fields and F numbers, and using Delphi language to develop an in-line control system.

Description

technical field [0001] The invention belongs to the field of continuous casting, and in particular provides an online method for controlling the flow of molten steel in a crystallizer. The technology can prevent mold slag from being involved in the crystallizer and improve the quality of continuous casting slabs. Background technique [0002] The results of the water model test and numerical simulation show that during the slab continuous casting process, the molten steel flowing out of the submerged nozzle is divided into two streams, upward and downward, after reaching the vicinity of the narrow shell of the crystallizer, see figure 1 . On the one hand, if the upward shunt is too large, the surface flow of the molten steel in the mold will rush the mold slag particles into the molten steel, and some of them will be captured by the growing billet shell, resulting in slag entrainment defects. On the other hand, if the upward shunt is too small, the surface heat of molten st...

AI Technical Summary

Problems solved by technology

[0011] According to the definition of F number by NKK, it can be known that to calculate F number, the collision velocity V, collision angle θ, and molten steel depth D at the collision point must be obtained first. θ and D are unknowable

NKK once obtained the empirical formulas for calculating the collision velocity V, collision angle θ, and molten steel depth D at the collision point of its No. 3 slab caster through water model tests, but it was applied to the casting conditions of domestic Baosteel and other factories, and it was found that it could not be applied (for example, The calculated molten steel flow reaches the narrow edge collision depth or even exceeds the liquid level)

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