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鋼液/(N2、H2)過飽和體系中氣泡生長的數值分析

Numerical analysis of bubble growth in a molten steel/(N2,H2) supersaturation system

  • 摘要: 采用水/CO2體系模擬研究鋼液/(N2、H2)過飽和體系中氣泡生長動力學行為,分別建立水溶液和鋼液中氣泡形核長大機理模型.基于三種不同的氣泡生長數學模型,分別研究水/CO2和鋼液/(N2、H2)體系數學模型中氣泡生長動力學,并采用水模型實驗數據對數學模型進行驗證.分析鋼液/(N2、H2)體系前期和后期處理壓力以及鋼液深度等因素對氣泡生長的影響.研究表明:采用氣泡浮選去除夾雜物技術時,前期處理壓力對氣泡生長有顯著促進作用;后期處理壓力對氣泡生長有阻礙作用,隨著后期處理壓力的升高影響逐漸加強;鋼液深度對氣泡生長有阻礙作用,隨著鋼液深度的增加影響逐漸減弱;相比氮氣,鋼液中氫氣氣泡析出長大更快.

     

    Abstract: A water/carbon dioxide system was used to study bubble growth dynamics in a molten steel/(N2,H2) supersaturation system. Bubble nucleation and growth mechanism models in the aqueous solution and the molten steel were respectively established.Bubble growth dynamics in the water/carbon dioxide system and the molten steel/(N2,H2) system was studied based on three different kinds of bubble growth mathematical models. Water modeling experimental data were used to validate the mathematical models. The influences of preprocessing pressure,post-processing pressure and the depth of molten steel on bubble growth were analyzed in the molten steel/(N2,H2) system. It is found that when using the technology of inclusion removal by bubble flotation,preprocessing pressure has significant effect on the bubble growth. However,post-processing pressure blocks the bubble growth,and with increasing post-processing pressure,the influence gradually strengthens. The depth of molten steel has retarding effect on the bubble growth,and with the increasing of the depth of molten steel,the influence gradually weakens. Compared with nitrogen bubbles,hydrogen bubbles in molten steel grow faster.

     

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