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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4 mm,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 outgassing effect of the air purifying brick blowing purifier was measured online. The calculation model of outgassing efficiency was established based on the outgassing kinetics equation. The bubble size was calculated. The influence of gas expansion and bubble coalescence was corrected. The results show that the efficiency of degassing increases with the increase of N2 flow rate. When N2 is used as the purge gas, the degassing efficiency is within 40%, while the degassing efficiency increases about 10% with N2-Cl2 gas mixture. After correction, the bubble size blown into the aluminum liquid through the ventilation brick is about 4 mm, and the calculated value of the outgassing efficiency is in good agreement with the test result. The gas utilization efficiency during degassing is 50% -70%. From the kinetic point of view, the main ways to improve the efficiency of outgassing are obtained.