| 煤焦破碎及颗粒物形成的逾渗模拟 |
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| 引用本文： | 温昶,徐明厚,于敦喜,岳良,周科,占中华,姚洪. 煤焦破碎及颗粒物形成的逾渗模拟[J]. 中国电机工程学报, 2011, 31(11) |
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| 作者姓名： | 温昶 徐明厚 于敦喜 岳良 周科 占中华 姚洪 |
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| 作者单位： | 煤燃烧国家重点实验室(华中科技大学),湖北省,武汉市,430074 |
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| 基金项目： | 国家自然科学基金项目(50720145604,50721005); 中央高校基本科研业务费资助(HF07162010121)~~ |
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| 摘 要： | 采用座逾渗模型,引入计算机控制扫描电镜(computer-controlled scanning electron microscope,CCSEM)矿物原粒径数据作模型初始矿物数据,考察了不同孔隙分布对煤焦转化与破碎的影响,煤焦转化过程对破碎程度的影响,以及煤焦破碎和内在矿聚合对飞灰颗粒物尤其是1～10 μm颗粒物最终分布的影响.模拟结果表明:煤焦初始孔隙率越大,表面反应而积和破碎次数均越大.当φ≥0.4时,煤焦破碎明显集中于转化率为0.4～0.7的阶段,且峰值有一定的向转化前期移动的趋势.初始孔隙率φ越大,颗粒破碎就越剧烈,内在矿聚合概率小,10 μm以内颗粒物的数目明显增大.随着φ值的增大,生成颗粒物的浓度尤其是1～10 μm颗粒物的浓度逐渐升高,最终颗粒物浓度分布到在3～5μm和6～8 μm存在2个峰值,这与实际燃烧生成的中间模态和粗模态颗粒物的峰值基本吻合.
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| 关 键 词： | 座逾渗模型 计算机控制扫描电镜 颗粒物 煤焦破碎 矿物聚合 |
Percolation Modeling of Char Fragmentation and Particulate Matter Formation |
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| WEN Chang , XU Minghou , YU Dunxi , YUE Liang , ZHOU Ke , ZHAN Zhonghua , YAO Hong. Percolation Modeling of Char Fragmentation and Particulate Matter Formation[J]. Proceedings of the CSEE, 2011, 31(11) |
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| Authors: | WEN Chang XU Minghou YU Dunxi YUE Liang ZHOU Ke ZHAN Zhonghua YAO Hong |
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| Affiliation: | WEN Chang,XU Minghou,YU Dunxi,YUE Liang,ZHOU Ke,ZHAN Zhonghua,YAO Hong(State Key Laboratory of Coal Combustion(Huazhong University of Science and Technology),Wuhan 430074,Hubei Province,China) |
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| Abstract: | A site percolation model of char fragmentation and particulate matte(PM) formation during dense and porous char combustion was reported in this paper.The sizes of included minerals in pulverized coal were determined on the computer-controlled scanning electron microscope(CCSEM).The model presents the influence of initial pore distribution during char oxidation and fragmentation,the impact of char conversion process on the extent of fragmentation,and the particulate matters(PM) sizes distribution,especially ... |
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| Keywords: | site percolation model computer-controlled scanning electron microscope(CCSEM) particulate matter char fragmentation mineral coalescence |
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