含钒钛铁水/半钢预脱硫温降计算与分析

Calculation and analysis on temperature drop during pre-desulfurization of hot metal/semi-steel containing vanadium and titanium

为了分析含钒钛铁水/半钢预脱硫过程中影响温降的因素,根据物料平衡和热量平衡原理,建立了铁水/半钢预脱硫温度预报模型。根据脱硫前铁水/半钢温度,通过调节脱硫剂喷吹量、载气流量和喷吹时间等参数,较好地控制了脱硫后的铁水/半钢的温度。工业试验表明,当精度为±5℃时,模型温度预报的合格率达85%。进一步根据该模型探讨了脱硫剂、载气、炉衬、炉渣等因素对温降的影响规律,发现脱硫剂镁是造成铁水预脱硫温降大于半钢的主要原因,并给出了减小含钒钛铁水预脱硫过程温降的有效方法。

In order to analyze the influence factors of the temperature drop during the pre-desulfurization of hot metal/semi-steel containing vanadium and titanium, a temperature prediction model of the pre-desulfurization was established based on the theories of material balance and heat balance. The temperature of hot metal/semi-steel after desulfurization was well controlled by adjusting the desulfurizer injection amount, flow rate of carrier gas and injection time, according to the temperature before pre-desulfurization. The industrial test showed that the qualified rate of the temperature prediction model reached 85% when the accuracy was ±5 ℃. Based on this model, the influence of desulfurizer, carrier gas, furnace lining, slag and other factors on the temperature drop was discussed. It was found that magnesium content of desulfurizer was the main reason that the temperature drop of hot metal pre-desulfurization was larger than that of semi-steel. And the effective methods to reduce the temperature drop of hot metal pre-desulfurization process containing vanadium and titanium were given.