| 浓相气固高密度流化床内的气泡动力学行为特性 |
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| 引用本文： | 贺靖峰,赵跃民,何亚群,段晨龙.浓相气固高密度流化床内的气泡动力学行为特性[J].煤炭学报,2012,37(2):295-300. |
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| 作者姓名： | 贺靖峰 赵跃民 何亚群 段晨龙 |
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| 作者单位： | 中国矿业大学 化工学院，江苏 徐州 221116 |
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| 基金项目： | 国家重点基础研究发展计划（973）资助项目(2012CB214904)；国家自然科学基金创新研究群体资助项目(50921002)；国家自然科学基金委—神华集团“煤炭联合基金”重点资助项目(51134022) |
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| 摘 要： | 采用试验测量与数值模拟计算相结合的方法，对干法选煤采用的浓相气固高密度流化床内的气泡动力学行为进行研究。对影响床层稳定性和密度均匀分布的气泡尺寸与上升速度进行计算分析，结果表明：以Geldart B类高密度磁铁矿粉作为分选介质，在表观流化气速 1.5 U mf ≤ U ≤ 2.2 U mf的条件下，气泡沿床高方向与床体轴向的气泡平均直径分布为35 mm< D b <49 mm和 40 mm< D b <61 mm，气泡上升速度范围为40~65 cm/s，试验与模拟结果基本吻合；此时，流化床内各点的密度分布均匀稳定，密度分布标准偏差为0.016 8。因此，调节表观流化气速 1.5 U mf≤ U ≤2.2 U mf ，可以使气泡尺寸和上升速度都保持在合理的范围内，流化床处于最有利于煤炭分选的准散式流态化，分选效果最好。
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| 关 键 词： | 气固流化床 动力学行为 干法分选 数值模拟 |
| 收稿时间： | 2011-10-13 |
| 修稿时间： | 2011-12-13 |
Dynamic fluid bubble behaviors in the dense gas-solid fluidized bed with high densities |
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| HE Jing-feng,ZHAO Yue-min,HE Ya-qun,DUAN Chen-long.Dynamic fluid bubble behaviors in the dense gas-solid fluidized bed with high densities[J].Journal of China Coal Society,2012,37(2):295-300. |
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| Authors: | HE Jing-feng ZHAO Yue-min HE Ya-qun DUAN Chen-long |
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| Affiliation: | (School of Chemical Engineering and Technology,China University of Mining & Technology,Xuzhou 221116,China) |
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| Abstract: | Experimental measurement and numerical simulation were combined to conduct the research of dynamic fluid bubble behaviors in the dense gas-solid fluidized bed with high densities,which is applied in the dry beneficiation.Mean diameter of the bubbles and their rising velocity were calculated and analyzed,which have a significant influence on the stable condition and uniform density distribution of the fluidized bed.The results indicate that the mean diameters among transverse and axial directions are 35 mm
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| Keywords: | gas-solid fluidized bed dynamic behavior dry beneficiation numerical simulation |
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