不同条件下燃煤颗粒物的粒径分布研究
Study on particle size distribution of coal combustion under different conditions
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摘要: 为研究不同条件对煤燃烧生成颗粒物的影响，在实验室条件下，利用微孔均匀沉积冲击器将煤粉燃烧后生成的颗粒物分离并收集到0~18 μm中的11个区间，研究了燃烧温度、质量、煤种及其尺寸大小对颗粒物生成的影响。结果表明：低温状态下，烟煤和褐煤收集到的总颗粒物质量较高温状态下明显增加；高温状态下，两者颗粒粒径分布在1.0~10 μm区间内质量增加，粒径峰值分别出现在0.18~<0.32 μm、0.32~1.0 μm内；烟煤燃烧生成颗粒物质量较褐煤明显增多，燃烧生成颗粒物质量与煤粉质量及尺寸大小呈正比关系。Abstract: In order to study the influence of different conditions on the particulate matter produced by coal combustion, the particulate matter produced by coal combustion is separated and collected in 11 ranges of 0-18 μm by micro-orifice uniform deposit impactor under laboratory conditions. The effects of combustion temperature, mass, coal type and size on the formation of particulate matter are studied. The results show that the total particle mass of bituminous coal and lignite at low temperature is obviously higher than that at high temperature. At high temperature, the particle size distribution of the two samples increased in the range of 1.0-10 μm, and the peak size appeared in the range of 0.18-0.32 μm and 0.32-1.0 μm respectively. Compared with lignite, the quality of particles produced by bituminous coal combustion is obviously increased, and the quality of particles produced by bituminous coal combustion is proportional to the quality and size of pulverized coal.
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