| 燃煤排放可吸入颗粒物的显微结构与物质组成研究 |
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| 引用本文： | 孙俊民,温茂,刘惠永,姚强,徐旭常.燃煤排放可吸入颗粒物的显微结构与物质组成研究[J].地球化学,2007,36(1):55-61. |
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| 作者姓名： | 孙俊民 温茂 刘惠永 姚强 徐旭常 |
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| 作者单位： | 1. 清华大学,煤清洁燃烧国家工程研究中心,北京,100084
2. 内蒙古建材产品质量检验所,内蒙古,呼和浩特,010010 |
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| 基金项目： | 国家自然科学基金，国家重点基础研究发展计划(973计划) |
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| 摘 要： | 对我国西南地区三个火电厂排放的可吸入颗粒物(PM10)的显微结构、矿物和化学组成等的研究表明,在PM10中,随着粒径的减小,非球形颗粒的比例增加;同原状飞灰相比,PM10以实心结构为主,多孔和空心结构较少;场发射扫描电子显微镜下,多数PM10颗粒的表面并不光滑,而是布满了次级微细颗粒;PM10的物相组成与燃煤煤种密切相关,小龙潭电厂PM10主要矿物包括石英、石灰、石膏和赤铁矿,而贵阳电厂PM10则以莫来石和石英为主;据单个PM10颗粒化学组成,将PM10分为硅质、铁质、Ca-铝硅质、Fe-铝硅质、Ca-Fe-铝硅质和硫酸钙六种颗粒类型;从不同采样点PM10元素组成看,从静电除尘器(ESP)前到ESP,PM10化学成分变化不大,到ESP后,元素Fe、Ca、Mg和Al的含量急剧减少,而Na的含量则迅速增高.
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| 关 键 词： | 煤粉燃烧 可吸入颗粒物(PM10) 显微结构 矿物组成 化学成分 |
| 文章编号： | 0379-1726(2007)01-0055-07 |
| 修稿时间： | 2006年4月1日 |
Microstructure and composition of inhalable particulate matter (PM10) from coal-fired power plants in Southwest China |
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| SUN Jun-min,WEN Mao,LIU Hui-yong,YAO Qiang,XU Xu-chang.Microstructure and composition of inhalable particulate matter (PM10) from coal-fired power plants in Southwest China[J].Geochimica,2007,36(1):55-61. |
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| Authors: | SUN Jun-min WEN Mao LIU Hui-yong YAO Qiang XU Xu-chang |
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| Abstract: | The microstructure, mineral phase and chemical composition of inhalable particulate matter (PM_(10)) from three coal-fired power plants in Southwest China were studied by two types of scanning electron microscope (SEM), electron probe, X-ray diffraction (XRD) and inductively coupled plasma mass spectrometer (ICP-MS). The results indicate that the number of non-spherical particle increases with decreasing grain size of PM_(10). There are more solid spheres and less porous and hollow spheres in PM_(10) compared with original fly ash particles. The surface of PM_(10) is normally coated with a layer of ultra-fine particles. The main minerals of PM_(10) from Xiaolongtan power plant include quartz, lime, gypsum and hematite, but mullite and quartz are the main crystalline phases of PM_(10) from Guiyang power plant. Six types of single particle, namely, silicon, ferruginous, Ca-aluminosilicate, Fe-aluminosilicate, Ca-Fe-aluminosilicate and calcium sulfate were identified according to their chemical composition. From electrostatic precipitator (ESP) inlet to ESP, the main element contents of PM_(10) have little variety, however, the contents of Fe, Ca, Mg and Al decrease significantly and the content of Na increases markedly on ESP outlet. |
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| Keywords: | pulverized coal combustion inhalable particulate matters (PM_(10)) microstructure mineral composition chemical composition |
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