Thermal simulation experiments on scrap melting in liquid steel

Abstract

The melting rate of round and square steel bars with various initial temperatures and sizes, and steel bars immersed in a liquid steel bath with different temperatures were studied. A steel shell was immediately formed around the original steel bar after it was immersed into the liquid steel, and then melt back as the immersion time increases. An increase in the preheating temperature of the bar and the liquid steel bath temperature is beneficial to steel bar melt. The maximum thickness of the steel shell decreases with increasing the initial temperature. While an increase in the liquid steel bath temperature, leads to an increase in the maximum thickness of the shell. When the round bar and square bar melt under the same conditions, the melting time of square bar is longer. It was also found that the heating rate in the centre of the steel bar initially increases and then decreases as the immersion time increases. The experimental results are of great significance for scrap melting and burden distribution in the electric arc furnace.

Melting Characteristics of Multipiece Steel Scrap in Liquid Steel

“…The experimental apparatus and procedure were the same as our single-bar melting experiments, described in a previous article. 1)…”

“…Xiaojun XI, 1,2) Sai CHEN, 1,2) Shufeng YANG, 1,2) * Maolin YE 1,2) and Jingshe LI, 1,2) by thermal simulation experiment in induction furnace. In these studies, the melting characteristics of an individual steel bar with simple geometries, such as cylindrical and square, were observed.…”

“…[5][6][7][8][9][10][11] And the factors, such as initial temperature and initial size of the steel bar, and the liquid steel temperature, on the melting of the individual steel bar, were also investigated. [1][2][3][4][12][13][14] In addition, the mass and heat transfer coefficients between the liquid steel and the steel bar under different experimental conditions were also analyzed. [15][16][17][18][19] Mathematical model and numerical simulation, as inexpensive and computationally efficient research methods, were widely used to study the melting of steel bar in liquid steel.…”

“…Based on the single-bar melting experiments introduced in a previous article, 1) the present work was studied the melting characteristics of two-bar and multibar samples in liquid steel, and the effect of spacing between the steel bars on the agglomeration of steel shells around the steel bars and the melting rate of steel scrap samples was also analyzed. On the basis of these, a calculation model of melting time of steel scrap in the EAF under different bulk densities and random stacking conditions was established.…”

“…With the Chinese government vigorously advocating low-carbon and green development, the electric arc furnace (EAF) steelmaking process with steel scrap as the main raw material has been valued. 1) In addition, the Chinese government has vigorously cracked down on substandard steel and promoted the industrialization of steel scrap resources, thereby further promoting the development of EAF steelmaking. 2) However, the melting rate of steel scrap is one of the important influencing factors for EAF to improve production efficiency and reduce energy consumption.…”