Formation of submicron particulate matter (PM1) during coal combustion and influence of reaction temperature
Formation of submicron particulate matter (PM1) during coal combustion and influence of reaction temperature
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DOI：
10.1016/j.fuel.2006.01.009
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发表时间：
2006-07
期刊：
影响因子：
7.4
通讯作者：
Lian Zhang;Y. Ninomiya;T. Yamashita
中科院分区：
文献类型：
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作者：
Lian Zhang;Y. Ninomiya;T. Yamashita
在实验室规模的落管式炉中进行煤粉燃烧，以研究直径小于 1.0μm 的亚微米颗粒物 (PM1) 的形成。测试了三个温度：1473、1573 和 1723K。 PM1 由低压撞击器收集，该撞击器自动将颗粒物分离成 0.03 至 0.76μm 之间的七种尺寸。每种尺寸均采用多种技术进行元素成分和形态分析。结果表明，PM1主要由两部分组成：小于0.1μm的颗粒物和较大的颗粒物。前一部分在本研究中称为 PM0.1，是由煤热解中有机结合元素分解或焦炭燃烧中无机化合物蒸发产生的元素蒸气聚集形成的。硫酸盐和磷酸盐在这部分中占主导地位。另一方面，PM1 中的后一部分，称为 PM0.1+，含有两种典型颗粒：一种为熔融固体形状，富含硅酸铝，另一种为分形团聚体形式。固有细粒矿物（≤1μm）的释放和含有汽化元素的核的聚集是其形成的两个主要途径。 PM0.1+主要是在木炭燃烧过程中形成的。另外，煤种和反应温度对PM1的生成影响很大。烟煤燃烧比无烟煤产生更多的 PM1。温度升高也会产生更多的 PM1。
Combustion of pulverized coals was conducted in a lab-scale drop tube furnace to investigate the formation of submicron particulate matters less than 1.0μm in diameter (PM1). Three temperatures, 1473, 1573 and 1723K were tested. PM1was collected by a low-pressure-impactor, which automatically segregates particulates into seven sizes ranging from 0.03 to 0.76μm. Each size was subjected to several techniques for elemental composition and morphology analysis. The results indicate that there are two major portions formed for PM1: particulates smaller than 0.1μm and those larger ones. The former portion, termed as PM0.1in this study, was formed by aggregation of elemental vapors generated by either decomposition of organically bound elements in coal pyrolysis or vaporization of inorganic compounds in char combustion. Sulfates and phosphates dominate this portion. On the other hand, the latter portion in PM1, termed as PM0.1+, was generated containing two kinds of typical particles: one is in a molten solid shape and rich in Al-silicates and another one in the fractal agglomerate form. Liberation of inherent fine minerals (≤1μm) and aggregation of nucleates containing vaporized elements are the two major routes for their formation. PM0.1+was mainly formed in char combustion. Additionally, both coal type and reaction temperature affected the formation of PM1greatly. Combustion of bituminous coals produced more the PM1than the anthracite coal did. Increasing temperature produced more the PM1as well.