透气砖底吹净化铝熔体的除气效率分析  

Analysis of degassing efficiency of porous brick to purify molten aluminum

作　　者：疏达[1] 王俊[1] 丁三才[1] 孙宝德[1] 王云利[2] 赵洪生[2] 金建华[2] 栗争光 张军[2] 

机构地区：[1]上海交通大学金属基复合材料国家重点实验室,上海200240 [2]中铝包头铝业有限公司,包头014046

出　　处：《轻合金加工技术》2009年第9期24-28,共5页Light Alloy Fabrication Technology

基　　金：国家重点基础研究发展计划(973)课题(2005CB623703);国家杰出青年科学基金项目(50825401)

摘　　要：在线测量了透气砖底吹净化装置的除气效果，从除气动力学方程出发建立了除气效率的计算模型，计算了气泡尺寸，并考虑气体受热膨胀和合泡的影响对其进行了修正。试验结果表明，除气效率随N2流量的增加而增大，当采用N2作为净化气体时，除气效率在40％以内，而采用N2-Cl2混合气体时，除气效率提高约10％。修正后计算得出通过透气砖吹入铝液中的气泡尺寸约为4mm，除气效率计算值与试验结果较吻合。除气过程中气泡利用效率为50％～70％。从动力学角度分析得出了提高除气效率的主要途径。The degassing efficiency of an on-line gas purging refining setup for molten aluminum using porous bricks was measured. A calculation model was established based on the kinetic equation of degassing. The bubble size was calculated and modified by taking thermal expanding and bubble coalescence into consideration. Experimental results show that degassing efficiency increases with the volumetric flow rate of nitrogen, with a value of less than 40 percent when purging N2 only and improved by 10 percent or ,so in the case of N2-Cl2 mixture. The calculated average bubble diameter is 4mm by modification, and the calculated degassing efficien- cies agree well with the experimental ones. The efficiency of bubbles during degassing process is 50 percent to 70 percent based on calculations. Based on the kinetic analysis, the ways to improve degassing efficiency are put forward.

关 键 词：铝熔体 透气砖 除气效率 动力学 

分 类 号：TF821[冶金工程—有色金属冶金]