| 燃煤细灰的形成及微观形态特征 |
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| 引用本文： | 刘建忠,张光学,周俊虎,范海燕,岑可法.燃煤细灰的形成及微观形态特征[J].化工学报,2006,57(12):2976-2980. |
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| 作者姓名： | 刘建忠 张光学 周俊虎 范海燕 岑可法 |
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| 作者单位： | 浙江大学能源清洁利用国家重点实验室，浙江 杭州 310027 |
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| 基金项目： | 国家自然科学基金
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教育部跨世纪优秀人才培养计划 |
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| 摘 要： | 引 言 大气环境中的细小颗粒物不仅影响气象和气候,使空气质量变差,降低大气能见度,而且对人体特别是呼吸系统有严重危害.研究表明细小颗粒物极易进入人体肺部,被吸收进入血液,长期蓄积在体内,且颗粒越小,进入肺部越深1].对我国大气中细小颗粒物来源虽有不同看法,但基本上认为煤燃烧是主要的来源之一2],而且因为煤成分的复杂性,使得燃煤细灰含有各种矿物成分和多种痕量有毒元素,灰粒越细,富集越多,因此燃烧源小颗粒毒性更强,危害更深3-4].由于现有的除尘设备,如煤粉炉普遍采用的电除尘器,虽然总除尘效率可以达到99%以上,但对细飞灰(PM2.5)的捕集效率也只有90%左右,而旋风除尘器更是在5%以下5].因此,加强燃煤细灰的形成、细灰微观形态特征及其有害元素分布规律的研究,对开发燃烧源小颗粒控制技术有重要的指导意义.
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| 关 键 词： | 煤 燃烧 细颗粒 微观形态 重金属 |
| 文章编号： | 0438-1157（2006）12-2976-05 |
| 收稿时间： | 01 20 2006 12:00AM |
| 修稿时间： | 2006-01-202006-03-13 |
Formation and micromorphology characteristics of fine particles generated during coal combustion |
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| LIU Jianzhong,ZHANG Guangxue,ZHOU Junhu,FAN Haiyan,CEN Kefa.Formation and micromorphology characteristics of fine particles generated during coal combustion[J].Journal of Chemical Industry and Engineering(China),2006,57(12):2976-2980. |
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| Authors: | LIU Jianzhong ZHANG Guangxue ZHOU Junhu FAN Haiyan CEN Kefa |
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| Affiliation: | State Key Laboratory of Clean Energy Utilization, Zhejiang University, Hangzhou 310027, Zhejiang, China |
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| Abstract: | The formation, micromorphology characteristics and heavy metals enrichment of fine particles generated during coal combustion were studied. The particles were sampled by using impacting classifier, the micromorphology was examined with SEM and the heavy metals content was measured with atomic absorption spectrophotometer. The results indicated that the morphology and heavy metals enrichment of the particles were related to the particle size. Coarse particles commonly showed irregular shapes, while particles were closer to spherical shape with decreasing size. Submicron particles were always spherical and usually attached to big ones. The heavy metals content of the particles increased with decreasing particle size. |
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| Keywords: | coal combustion fine particle micromorphology heavy metals |
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