KR搅拌结合底喷粉新型脱硫工艺的数值模拟

Numerical simulation of a new desulfurization process based on KR stirring combined with bottom powder injection

通过三维非稳态数学模型对KR机械搅拌结合包底喷粉脱硫工艺进行了研究,对比分析了在机械搅拌作用下,铁水包底喷粉位置对铁水流场和脱硫剂运动行为的影响。结果表明,当脱硫剂从靠近壁面位置(距离铁水包底中心0.8 R)喷入时,相较于从距离铁水包底中心0.4 R和0.6 R处喷入,脱硫剂在底部弱流区停留时间分别增加了100%和50%,运动范围分别增加了200%和80%,有效强化了底部弱流区的脱硫反应。相较于传统的表面连续添粉方式,从底部喷入脱硫剂能有效解决中心强制涡流区脱硫剂在脱硫反应前的团聚问题,降低了约40%的脱硫剂使用量,显著提高了脱硫效率。

The 3D unsteady mathematical model was established to study the KR mechanical stirring coupled with bottom powder injection desulfurization process.The effects of the powder injection location at the ladle bottom under the action of mechanical stirring on the molten iron flow field and the movement behavior of the desulfurizer were comparatively analyzed.The results show that when the desulfurier is injected from a position closer to the wall(0.8 R from the center of ladle bottom),compared with being injected at 0.4 R and 0.6 R from the center of ladle bottom,the residence time of the desulfurizer in the bottom weak current zone increases by 100%and 50%,and the movement range increases by 200%and 80%respectively,enhancing the desulfurization reaction in the bottom weak flow zone.Compared with the traditional method of continuous powder addition from the surface,injecting the desulfurizer from the bottom can effectively solve the problem of agglomeration of desulfurizer in the central forced vortex area before the desulfurization reaction,thus reducing the amount of desulfurizer used by 40%and significantly improving the desulfurization efficiency.