摘要
在实际装料时,不同密度、粒径及形状系数的颗粒在料面上的落点也各不相同。目前,文献在计算料流轨迹时存在忽略煤气曳力、密度选择不当或曳力公式使用有误等问题,与实际计算常有很大偏差。为此,针对目前料流轨迹计算存在的问题,准确考虑了颗粒在空区下落中所受重力、浮力及煤气曳力的作用,建立数学模型计算炉料颗粒在空区下落的运动轨迹。通过对不同炉料在其粒径范围内的布料半径变化及煤气对其曳力大小的讨论,正确考虑料流轨迹计算时煤气曳力的影响,为准确实现合理布料奠定基础。
Radial distribution of burden is determined by the position of particle landing during charging in blast furnace. In practice, the landing points of particles are not the same because of their different density, size and shape. In published papers, there are some problems such as： neglecting the drag force of gas, choosing the improper density and using irrelevantly the drag force formula, so the difference between calculation and practice is large. In this paper, the grain gravity, buoyancy and gas drag force are considered. In addition, the mathematical model is developed and the movement trajectory of a particle in free zone is computed. According to charging radius variation with different burdens in their range of grain diameter and the size of drag force, the influence of gas drag force is important when computing the burden trajectory for achieving the optimal burden distribution.
出处
《中国冶金》
CAS
2006年第9期24-26,共3页
China Metallurgy
基金
国家自然科学基金资助项目(60472095)
关键词
高炉
装料
曳力
料流轨迹
落点
blast furnace
charging
drag force
burden trajectory
landing point
