| 煤粉粒度对超细煤粉再燃脱硝效率影响的数值模拟 |
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| 引用本文： | 贾艳艳,毕明树,柳智. 煤粉粒度对超细煤粉再燃脱硝效率影响的数值模拟[J]. 煤炭学报, 2008, 33(11): 1296-1300 |
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| 作者姓名： | 贾艳艳 毕明树 柳智 |
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| 作者单位： | 大连理工大学 化工学院，辽宁 大连，116012 |
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| 基金项目： | 国家自然科学基金资助项目(50076006) |
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| 摘 要： | 借助CFD计算软件Fluent 6.1，对全尺寸四角切圆锅炉超细煤粉再燃烧过程进行了三维数值模拟.以烟煤的超细煤粉作为再燃燃料，研究了NOx排放随再燃煤粉粒径、再燃区过量空气系数及再燃量的变化规律，并给出了不同再燃煤粉粒径工况下炉膛中心截面上NOx浓度分布.结果表明，对于不同粒度的再燃燃料，再燃区过量空气系数存在同一最佳值，在0.8～0.9之间；脱氮率随着再燃量的增加而增大，最佳再燃量为20%；再燃煤粉越细，对NOx的还原作用越强，最佳再燃燃料平均粒径为20 μm.
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| 关 键 词： | 超细煤粉；再燃脱硝；数值模拟；全尺寸锅炉 |
Numerical simulation of effect of coal particle size on NOx reduction in micro-pulverized coal reburning |
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| JIA Yan-yan,BI Ming-shu,LIU Zhi. Numerical simulation of effect of coal particle size on NOx reduction in micro-pulverized coal reburning[J]. Journal of China Coal Society, 2008, 33(11): 1296-1300 |
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| Authors: | JIA Yan-yan BI Ming-shu LIU Zhi |
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| Affiliation: | 1.School of Chemical Engineering;Dalian University of Technology;Dalian 116012;China;2.Utilities Engineering Department;CISDI Engineering Co.Ltd.;Chongqing 400013;China |
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| Abstract: | Three dimensional numerical simulation of micro-pulverized coal reburning process in full-scale tangentially fire boiler was conducted with CFD software Fluent 6.1.Bituminous coal was chosen as reburning fuel to study the effects of micro-pulverized coal size,stoichiometric ratio in rich zone and reburning fuel fraction on NOx emissions.NOx concentration field with different particle sizes of reburning coal were given.The results indicate that when the stoichiometric ratio is between 0.8~0.9 in rich zone,th... |
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| Keywords: | micro-pulverized coal NOx reduction numerical simulation full-scale boiler |
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