Analysis of BF Flow Field before and after Slag Formation
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摘要: 为探究炉缸炉底在正常侵蚀的情况下和出现挂渣之后侵蚀的情况下炉缸内铁水流场的区别。以流体力学理论基础,建立了炉缸炉底在侵蚀前后铁水流场的三维数学模型和炉缸内生成结渣之后铁水流动对炉缸炉底的侵蚀情况的三维数学模型。利用CFX软件,研究不同时期炉缸炉底的速度矢量和不同位置的流线。结果表明,生成挂渣前后炉缸出现环流现象,但是由于挂渣粘附在炉缸上,对炉缸有一定的保护作用,同时炉缸内出现挂渣之后减小了炉缸的内部构造,使铁水流出出铁口的速度加快。在生产中可利用生成挂渣,加快出铁速度,同时依靠挂渣的保护作用,延长高炉炉缸的使用年限。Abstract: In order to investigate the difference of molten iron flow field in furnace hearth under normal erosion and adherent dross erosion,basing on the fluid mechanics two 3D mathematical models had been developed,which were used to describe the molten iron flow fields before/after hearth bottom erosion and the erosion of molten iron impacting on hearth bottom after slag forming.. And CFX software had been utilized to study the velocity of flow at bottom and streamlines at different locations. Before/after the occurrence of adherent dross circumfluence phenomena appeared around the hearth,and adherent dross have protective effect to a certain extent on hearth. The formation of adherent dross decreased the internal structure of the hearth and consequently accelerated the outflow of molten iron through taphole. It is suggested that under industrial production the adherent dross can be used to speed up tapping process and prolong the service life of blast furnace hearth via its protective effect on hearth.
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Key words:
- blast furnace /
- hearth /
- bottom /
- wall shear stress /
- flow field /
- adherent dross /
- dead-man
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