| O2/CO2气氛下O2浓度对燃煤PM2.5形成的影响 |
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| 引用本文： | 屈成锐,徐斌,吴健,刘建新,王学涛. O2/CO2气氛下O2浓度对燃煤PM2.5形成的影响[J]. 燃料化学学报, 2013, 41(3): 356-360 |
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| 作者姓名： | 屈成锐 徐斌 吴健 刘建新 王学涛 |
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| 作者单位： | College of Vehicle & Motive Power Engineering, Henan University of Science and Technology, Luoyang 471003, China |
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| 基金项目： | 国家自然科学基金(50806020) |
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| 摘 要： | 采用管式炉和荷电低压撞击器(electrical low pressure-impactor,ELPI)研究了徐州烟煤在O2/CO2条件下燃烧后生成的PM2.5排放特性。结果表明,在O2/CO2气氛下,煤粉在不同O2浓度燃烧所产生的PM2.5质量浓度均呈双峰分布,峰值分别在0.1和2.0 mm左右;随着氧含量的增加,PM2.5的质量浓度增加;S、K和Na在亚微米颗粒上明显富集,而Si和Ca未在亚微米颗粒上富集;通过对颗粒物的粒径分布、元素分析和形貌观察,认为亚微米颗粒主要是矿物质蒸发鄄凝结机制形成的,而超微米颗粒主要是煤焦与外部矿物质的破碎以及内在矿物质聚合形成的。
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| 关 键 词： | O2/CO2 煤燃烧 PM2.5 形成机理 O2浓度 |
| 收稿时间： | 2012-08-17 |
Effect of oxygen concentration on PM2.5 formation during coal combustion under O2/CO2 atmosphere |
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| QU Cheng-rui,XU Bin,WU Jian,LIU Jian-xin,WANG Xue-tao. Effect of oxygen concentration on PM2.5 formation during coal combustion under O2/CO2 atmosphere[J]. Journal of Fuel Chemistry and Technology, 2013, 41(3): 356-360 |
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| Authors: | QU Cheng-rui XU Bin WU Jian LIU Jian-xin WANG Xue-tao |
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| Affiliation: | (College of Vehicle & Motive Power Engineering,Henan University of Science and Technology,Luoyang 471003,China) |
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| Abstract: | Pulverized coals were burned in a tube furnace under O2/CO2 atmosphere, and an electrical low pressure-impactor (ELPI) was used to collect the PM2.5. The results show that a bimodal distribution of PM2.5 appears, which is located at 0.1 μm and 2.0 μm, respectively. The mass concentrations of PM2.5 increase with5 enhancing the O2 concentraion. The enrichment of S, Na and K on the sub-micron particles is observed, but that of Si and Ca is not observed. It is proposed that sub-micron particles are formed via the mechanism of vaporization and condensation, and the super-micron particles are formed by the fragmentation of coal char and the coalescence of inherent mineral matter based on the analyses of particle size distribution, elements distribution and morphology of PM2.5. |
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| Keywords: | O2/CO2 coal combustion PM2.5 formation mechanism O2 concentration |
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