Submicrometer Particle Formation and Mercury Speciation Under O2-CO2 Coal Combustion
Submicrometer Particle Formation and Mercury Speciation Under O2-CO2 Coal Combustion
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DOI：
10.1021/ef060178s
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发表时间：
2006-10
期刊：
影响因子：
5.3
通讯作者：
Achariya Suriyawong;Michael Gamble;Myong-Hwa Lee;R. Axelbaum;P. Biswas
中科院分区：
文献类型：
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作者：
Achariya Suriyawong;Michael Gamble;Myong-Hwa Lee;R. Axelbaum;P. Biswas
比较了煤在氧-二氧化碳和空气（常规）系统中燃烧的亚微米模式的灰分和汞形态的特征。实验在不同的O2：CO2和O2：N2：CO2混合比下进行。在用二氧化碳代替空气中的氮气时，灰的亚微米模式（<0.5 μm）的颗粒的总质量较小。相应地，亚微米气溶胶的几何平均粒径（dpg）约小28%。当O2：CO2比从1：4增加到4：4时，亚微米模式的几何平均尺寸从29增加到54 nm，这是因为更高的煤颗粒温度导致更快的蒸发速率。由于相同的原因，在固定的O2浓度下，在增加N2：CO2比时观察到几何平均尺寸的增加。在所有的测试中的初级颗粒的形状是球形的，表明蒸汽到颗粒的转化途径是普遍的。的比例，ele…
The characteristics of the submicrometer mode of ash and mercury speciation on combustion of coal in an oxygen−carbon dioxide and air (conventional) system were compared. The experiments were conducted at different O2:CO2 and O2:N2:CO2 mixing ratios. On replacing the nitrogen in air with carbon dioxide, the total mass of the particles in the submicrometer mode (<0.5 μm) of ash was smaller. Correspondingly, the geometric mean size (dpg) of the submicrometer aerosol was smaller by approximately 28%. When the O2:CO2 ratio was increased from 1:4 to 4:4, the geometric mean size of the submicrometer mode increased from 29 to 54 nm because of a faster vaporization rate as a result of a higher coal particle temperature. An increase in the geometric mean size was observed on increasing the N2:CO2 ratio at a fixed O2 concentration because of the same reasons. The shape of the primary particles was spherical in all the tests, indicating that a vapor to particle transformation pathway was prevalent. The ratios of ele...