煤粉O2/CO2燃烧时PM2.5及其Fe、S的生成特性

摘要/Abstract

摘要：

沉降炉实验研究了煤粉O₂/CO₂燃烧时PM_2.5的生成特性和主要成灰元素中危害较大的Fe、S元素生成特性。实验用DT烟煤、NMG褐煤和XLT褐煤，实验温度1300℃，在O₂/CO₂=1∶9,1∶4,3

Abstract:

Laboratory scale experiments were conducted to study the formation and elemental concentration of PM_2.5 burning three typical Chinese coals in a drop tube furnace (DTF).The reaction temperature was 1300℃.The combustion atmosphere was O₂/CO₂ and O₂/N₂.The oxygen content in the O₂/CO₂combustion was 10%, 20% and 30%, respectively, the combustion in O₂/N₂ mixture of 1∶4 was also performed for a comparison.PM₁₀ was collected with a 13 stage low-pressure impactor (LPI）having an aerodynamic cutoff diameter ranging from 0.03 μm to 9.8 μm.The experimental results indicate that the tri-modally distribution are observed in the O₂/CO₂ combustion around 0.15 μm, 1.58 μm and larger than 3 μm.In comparison with the O₂/N₂ combustion, the O₂/CO₂ combustion can be effective in reducing PM_2.5 formation.Besides, decreasing the oxygen content causes a reduction of PM_2.5.Iron and sulfur have the quite adverse health effects comparing with other dominating elements in the particulate matter, so their concentration in PM_2.5 is non-ignorable. The sulfur concentration in the central mode of PM_2.5 is slightly less or even larger than the sulfur concentration in the ultrafine mode, and iron mostly exists in the central mode of PM_2.5.As the combustion condition changes, the sulfur concentration in PM_2.5from different coals presents a different characteristic.

温昶, 徐明厚, 于敦喜, 周科, 占中华, 赵靓, 姚洪. 煤粉O₂/CO₂燃烧时PM_2.5及其Fe、S的生成特性 [J]. 化工学报, 2011, 62(4): 1062-1069.

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煤粉O₂/CO₂燃烧时PM_2.5及其Fe、S的生成特性

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