侧吹炉内气流穿透和搅动行为实验研究

Experimental study on gas flow penetration and stirring behavior in side-blowing furnace

冶金炉冶炼过程伴随高温复杂多相化学反应,直接开展试验困难且成本高,众多学者采用水模型实验和数值模拟方法开展研究。侧吹气流穿透距离和搅动情况是侧吹炉体和喷枪设计中的关键数据指标,影响侧吹炉宽度设计和喷枪结构设计。本文采用水力模型实验研究喷枪浸入深度、喷枪高度、熔池液面高度、喷枪孔径和气体流量等因素对侧吹气流穿透距离和熔池搅动情况的影响。结果表明:熔池液面高度、喷枪高度和喷枪浸入深度对气流穿透距离没有影响或影响不明显;侧吹气流穿透距离主要与气流出口速度有关,穿透距离随气体流量增加而变长,随喷枪孔径减小而变长;气体流量对炉内熔池流动和搅动情况影响较大,合理的喷枪结构及排布设计和气体流量选择,有利于侧吹炉内形成充分的流动场和搅拌动力场。

The smelting process of metallurgical furnace is accompanied by complex multiphase chemical reactions at high temperature,so it is difficult and costly to carry out experiments directly.Hydraulic model experiment and numerical simulation methods are widely applied by researchers to carry out the study.The side-blowing gas penetration distance and agitation conditions are the key indicators in the design of side blowing furnace and lance,which affect the design of side blowing furnace width and spray gun structure.In this paper,the impact of the lance immersion depth,lance height,bath liquid level,lance diameter and gas flow volume on the side-blowing gas penetration distance and bath agitation are studied by using hydraulic model experiment.The results show that:bath liquid level,lance height and the immersion depth of the lance have no or insignificant impact on the gas penetration distance;the side-blowing gas penetration distance is mainly related to the gas outlet velocity as the distance increases with the increase of gas flow and the decrease of lance diameter;the gas flow has a great impact on the flow and agitation of the bath in the furnace,reasonable lance structure,layout design and gas flow selection will facilitate the formation of sufficient flow field and agitation power field in the side blowing furnace.