Abstract: The top blowing nuzzle for slag cleaning furnace is a distinctive kind of vertical downward pipe. Gas and liquid enter the pipeline from the Y-type tube，the other end of the nozzle is immersed in the molten pool. This paper analyzed multiphase flow quantitatively using simulation model in the experiments. The results show that the pressure difference of gas-liquid phase caused a transition from steady annular flow to steady bubbly flow was，and the area of each flow pattern depended on of the pressure difference. Three types of gas-liquid flows presented at the phase interface in the section between the main pipe and branch pipe（the area of mixing phase of gas and liquid）. The differences of bubbles stirred by immersion top blowing on different flow patterns were manifested in depth and width. The production was optimal at gas-liquid ratio of 2—5.

Key words: download flow, gas-liquid flow, flow, interface, mixing

摘要： 贫化电炉气液顶吹喷枪是一种独特的垂直下降管，其一端Y形通入气液两相，一端直接通入熔池中进行喷吹作业。本文采用多相流水模型模拟仿真的实验手段进行了定量分析，结果表明：不同于传统的垂直下降管，这种顶吹喷枪的管内流型受气液相间压差的影响，产生了一种由环状流过渡为泡状流的流型，不同流型的分布区域与压差的大小有关并且稳定存在；在支管与主管的交叉区域，对于不同的气液比存在3种气液混合相分界面，并各自产生不同的流型；浸没式顶吹气泡群形态在不同的管内流型驱动下有较大差异，表现在深度及宽度两个方面，并证明了气液比为2～5间的生产效果是最佳的。

关键词: 下降流, 气液两相流, 流动, 界面, 混合