桨叶喷吹铁水脱硫的数值模拟研究

Numerical Simulation Study on Desulfurization by Spraying Molten Iron with Blade

摘要: KR法虽然在深脱硫和超深脱硫方面优势明显，但由于KR法搅拌的混合特性，使得大部分脱硫剂会在中心强制涡流区发生团聚。为了改善脱硫剂的团聚情况，本文利用三维非稳态数学模型对桨叶不同位置喷脱硫剂的KR脱硫过程进行研究。结果表明：气体上浮推动铁水向上流动，会对铁水包两侧的自由涡流区产生影响；当喷嘴位置分布在桨叶侧面时，其气羽能够推动铁水向壁面流动，相较于喷嘴分布在桨叶底面，有利于增大自由涡流区强度，减小底部弱流区。相较于桨叶底吹，桨叶侧吹的铁水混匀时间减少13%，且使得更多脱硫剂进入底部弱流区，扩大脱硫剂的运动范围，降低其凝并程度，从而提高其脱硫效率。

Abstract: Although the KR method has obvious advantages in deep desulfurization and ultra-deep desulfurization, the mixing characteristics of KR method stirring make most of the desulfurizing agent agglomerate in the central forced vortex region. In order to improve the agglomeration of desulfurizing agent, this paper investigates the KR desulfurization process by spraying desulfurizing agent at different positions of the paddle using a three-dimensional non-stationary mathematical model. The results show that: the gas uplift pushes the iron to flow upward, which will affect the free vortex area on both sides of the iron package; when the nozzle position is distributed on the side of the paddle, its air plume can push the iron to the wall, compared with the nozzle distribution on the bottom of the paddle, which is conducive to increasing the strength of the free vortex area and reducing the weak flow area at the bottom. Compared with the paddle bottom blowing, the mixing time of iron and water in the paddle side blowing is reduced by 13%, and more desulfurizer enters the bottom weak flow area, which expands the movement range of desulfurizer and reduces its coagulation degree, thus improving its desulfurization efficiency.