煤样不同密度组分中致渣矿物特性的CCSEM研究

doi:10.3969/j.issn.0438-1157.2014.08.050

化工学报 ›› 2014, Vol. 65 ›› Issue (8): 3221-3227.DOI: 10.3969/j.issn.0438-1157.2014.08.050

煤样不同密度组分中致渣矿物特性的CCSEM研究

吴乐¹, 吴建群², 罗嘉¹, 陈世和¹, 于敦喜², 项辰², 徐明厚²

1 广东电网公司电力科学研究院, 广东广州 510080;
2 华中科技大学煤燃烧国家重点实验室, 湖北武汉 430074

收稿日期:2013-12-05 修回日期:2014-01-18 出版日期:2014-08-05 发布日期:2014-08-05
通讯作者: 于敦喜
基金资助:
国家自然科学基金项目（51376071）；国家重点基础研究发展计划项目（2013CB228501）；新世纪优秀人才支持计划资助（NCET-11-0192）。

CCSEM investigation on slagging minerals in different density ingredients of bituminous coal samples

WU Le¹, WU Jianqun², LUO Jia¹, CHEN Shihe¹, YU Dunxi², XIANG Chen², XU Minghou²

1 The Electric Power Research Institute of Guangdong Grid Corporation, Guangzhou 510080, Guangdong, China;
2 State Key Laboratory of Coal Combustion, Huazhong University of Science & Technology, Wuhan 430074, Hubei, China

Received:2013-12-05 Revised:2014-01-18 Online:2014-08-05 Published:2014-08-05
Supported by:
supported by the National Natural Science Foundation of China(51376071), the National Basic Research Program of China (2013CB228501) and the Program for New Century Excellent Talents in University (NCET-11-0192).

摘要/Abstract

摘要： 将一种典型的易结渣烟煤分为低（<1.3 g·cm^-3）、中（1.3～1.6 g·cm^-3）、高（>1.6 g·cm^-3）3个密度煤样。利用先进计算机控制扫描电镜（CCSEM）技术对原煤及分密度煤样中的致渣矿物进行了深入研究。结果表明，Na与K在煤中无机矿主要以硅铝酸盐的形式存在；粒径大于22 mm的外在（独立于炭基质）黄铁矿、磁黄铁矿主要分布在高密度煤中；未识别矿物（复杂硅铝酸盐）在高密度煤矿物中所占的比例最小，但其中Fe含量为20%～90%的颗粒所占比例最高；不同密度煤样中，内在（与炭基质结合）矿的硅铝比和碱酸比不同，低密度煤中内在矿的碱酸比最大，结渣倾向最严重，而中密度煤内在矿的碱酸比和硅铝比均小于原煤。

关键词: 煤燃烧, 燃料, 浮选, 烧结, 结渣, CCSEM

Abstract: A typical bituminous coal that could easily lead to slagging was divided into three ingredients with different density, i.e. low-density (<1.3 g·cm^-3), medium-density (1.3-1.6 g·cm^-3) and high-density (>1.6 g·cm^-3). Computer controlled scanning electron microscopy (CCSEM) was used to analyze and characterize the slagging minerals in the raw coal and three ingredients. The results showed that Na and K in inorganic minerals of the coal exist as aluminosilicate. Exterior (no bonding) pyrite and pyrrhotite with diameter larger than 22μm were mainly present in the high-density sample. The least proportion of unidentified materials in which there were the most particles containing 20%-90% of Fe component was involved in the high-density sample. The ratios of silicon to aluminum and basic to acidic oxides in bonding minerals were variation for different density samples. There was the highest basic to acidic oxides ratio in the low-density sample, suggesting highest slagging propensity. The ratios of silicon to aluminum and basic to acidic oxides were lower for the medium-density sample than for the raw coal.

Key words: coal combustion, fuel, flotation, sintering, slagging, CCSEM

中图分类号:

TK124

吴乐, 吴建群, 罗嘉, 陈世和, 于敦喜, 项辰, 徐明厚. 煤样不同密度组分中致渣矿物特性的CCSEM研究[J]. 化工学报, 2014, 65(8): 3221-3227.

WU Le, WU Jianqun, LUO Jia, CHEN Shihe, YU Dunxi, XIANG Chen, XU Minghou. CCSEM investigation on slagging minerals in different density ingredients of bituminous coal samples[J]. CIESC Journal, 2014, 65(8): 3221-3227.

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煤样不同密度组分中致渣矿物特性的CCSEM研究

CCSEM investigation on slagging minerals in different density ingredients of bituminous coal samples

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