噴吹脫硫製程鎂粒穿透鐵水之解析

Analysis of Penetrability of Magnesium Granules in Hot Metal by Injection

劉永章(Y. C. Liu) ； 孫海平(H. Sun) ； 陸木榮(M. J. Lu)

《鑛冶：中國鑛冶工程學會會刊》 54卷4期 (2010/12) Pp. 51-60

https://doi.org/10.30069/MM.201012.0006

摘要

本研究利用數學模型描述分析在單吹顆粒鎂鐵水脫硫製程中，鎂粒子、載氣、噴吹管和鐵水之間的熱傳和機械交互作用，引用穿透度因子來說明在噴吹管口鎂粒子穿透鐵水的程度。穿透度因子定義如下：穿透度因子＝鎂粒子氣化之前在鐵水中的穿透深度＝鎂粒子在鐵水中氣化形成之鎂氣泡半徑結果顯示：增加粒子尺寸、噴吹深度和載氣流量或減少噴管內徑、降低鐵水溫度將提高粒子的穿透度。而改變噴吹管長度、噴吹管內鐵管外徑以及鎂粒子的噴吹流量對粒子穿透度的影響不明顯。

關鍵字

噴吹製程 ； 鎂粒子 ； 穿透度 ； 煉鋼和鎂脫硫

並列摘要

The depth of a magnesium particle penetrating into a lance tip hot metal during a magnesium injection process was described by a mathematical model. The simulation incorporated the mechanical interaction and heat transfer between particles, magnesium particle size, carrier gas flow rate, lance inside diameter, and hot metal temperature. The penetrability of a magnesium particle into lance tip hot metal was analyzed using a penetration factor suggested below:Penetration factor=Penetration depth of a magnesium particle in hot metal before particle vaporization-Radius of magnesium vapor bubble in hot metal formed by the magnesium particle.In a magnesium injection process, the operational variables that favor a better penetration of the magnesium particle into the hot metal are larger size of particles, smaller internal diameter of the injecting lance, deeper injection, higher carrier gas flow rate and lower hot metal temperature. The influences of the thickness of lance refractory shell, the lance height above the bath surface and magnesium feeding rate on the penetrability are insignificant.

並列關鍵字

injection ； particle ； penetrability ； steelmaking ； magnesium and desulfurization