【摘要】 底吹喷嘴附近烧损一直是氧气底吹转炉炼钢的关键问题,建立了氧气底吹转炉喷嘴附近传热模型,本模型认为炉底热量来源于火点区的辐射热和钢水流动的对流换热。讨论和分析了底吹喷嘴及耐火砖的温度场,与实验数据吻合:在底吹喷嘴的高度方向上,发现喷嘴和底部耐火砖热端面温度最高。利用该传热模型,研究了不同材质内管的温度场的分布。其中导热系数大的材料温度梯度小,热端面的温度低;导热系数小的材料温度梯度大,热端面的温度高。因此从抑制喷嘴烧损的角度内管应选择导热系数较大的材料。更多还原

【Abstract】 Burning near the bottom-blowing nozzle has always been a key issue in oxygen-bottom-blowing converters. A heat transfer model near the nozzles of an oxygen-bottom-blowing converter has been established. This model considers that the heat at the bottom of the furnace is derived from the radiant heat in the fire zone and the convection of the molten steel flow. The temperature fields of the bottom-blowing nozzle and the firebrick were discussed and analyzed. The temperature field of the bottom-fired nozzle was found to match the experimental data. In the direction of the height of the bottom-blowing nozzle,it was found that the hot end face temperature of the nozzle and bottom refractory brick was the highest. Using this heat transfer model,the distribution of the temperature field of the tubes in different materials was studied. Among them,the material with a large thermal conductivity has a small temperature gradient and the hot end surface has a low temperature;a material with a small thermal conductivity has a large temperature gradient,and the hot end surface has a high temperature. Therefore,from the perspective of suppressing the nozzle burning,the pipe should be made of a material with a large thermal conductivity.更多还原