| 煤粉燃烧火焰区域内形成的亚微米颗粒电镜研究 | |
| 卓建坤 ; 李水清 ; 宋蔷 ; 姚强 ; ZHUO Jian-Kun ; LI Shui-Qing ; SONG Qiang ; YAO Qiang | |
| 2010-05-13 ; 2010-05-13 | |
| 关键词 | 煤粉燃烧火焰区域 亚微米颗粒 电镜分析 pulverized-coal flame submicron particles EM technology TK16 |
| 其他题名 | THE ELECTRON MICROSCOPY STUDY OF PMI IN THE PULVERIZED-COAL FLAME |
| 中文摘要 | 煤粉燃烧火焰区域是燃烧过程中温度最高的区域,同时也是温度梯度、组分浓度梯度最高的地方,以及还原和氧化气氛交错存在等复杂环境,这种环境对亚微米颗粒初始形成阶段有着重要的影响,对该区域形成的PM_1进行研究有助于深入理解PM_1的形成机理.本文基于25 kW一维下行炉内对自维持燃烧的煤粉火焰区域,通过两级稀释水冷等速取样系统和ELPI(荷电低压撞击分离器)系统对颗粒物进行分级收集,以及电镜分析技术,获得PM_1的质量和数浓度粒径分布,以及各粒径主要成分分布,并进行单颗粒分析.结果表明火焰区域中形成的亚微米颗粒以含碳物质为主.碳烟、碱金属和硫对超细颗粒有富集的趋势.该区域的亚微米颗粒同时存在多种复杂的形成机理.; The highest flame temperature,temperature field,constituents gradient and coexist of oxi- dation and reduce conditions,make an important effect on the formation of submicron particles(PM_1). In this paper,the PM_1 generated from a pilot-scale 25 kW down-fired combustor was extensively in- vestigated by using a nitrogen-aspirated,water-cooling isokinetic probe with two-stage dilution.A 13-stage Electric Low Pressure Impactor(ELPI)was used to deposit particles.Among which the last eight stages(PM_1)are selected for the further analysis by the EM(electron microscopy)technology. The particle size distribution of mass and number concentration obtained from ELPI,the species dis- tributions in each stage of ELPI and individual particle analysis obtained from EM analysis,show that alkalie,sulfur and soot have the tendency to partitioning to the finer particles in the PM_1.Further study show these two portions are formed from different sources. |
| 语种 | 中文 ; 中文 |
| 内容类型 | 期刊论文 |
| 源URL | [http://hdl.handle.net/123456789/31597]  |
| 专题 | 清华大学 |
| 推荐引用方式 GB/T 7714 | 卓建坤,李水清,宋蔷,等. 煤粉燃烧火焰区域内形成的亚微米颗粒电镜研究[J],2010, 2010. |
| APA | 卓建坤.,李水清.,宋蔷.,姚强.,ZHUO Jian-Kun.,...&YAO Qiang.(2010).煤粉燃烧火焰区域内形成的亚微米颗粒电镜研究.. |
| MLA | 卓建坤,et al."煤粉燃烧火焰区域内形成的亚微米颗粒电镜研究".(2010). |
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