| 燃煤PM2.5相变脱除实验研究 |
| 摘要点击 2762 全文点击 6114 投稿时间：2007-12-10 修订日期：2008-01-24 |
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| 中文关键词 PM2.5 脱除 相变 过饱和 燃煤 |
| 英文关键词 PM2.5 removal phase change supersaturation coal combustion |
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| 中文摘要 |
| 实验研究了添加蒸汽和雾化水2种不同烟气调节方式下，操作参数对燃煤可吸入颗粒物凝结长大脱除特性的影响.用电称低压冲击器（ELPI）实时测量脱除前后颗粒数浓度和粒径分布情况.结果表明，蒸汽在颗粒表面凝结能有效促进燃煤PM2.5的脱除；颗粒的分级脱除效率随粒径的增大呈上升的趋势，特别是对于粒径<0.3 μm的颗粒，当蒸汽添加量为0.1 kg/m3，随粒径从0.03 μm增加到0.3 μm，脱除效率提高了60%以上；添加蒸汽时，脱除效率与调节室入口烟气温度无关；而添加雾化水，脱除效率则随调节室入口烟气温度的升高而显著增大，温度从136℃升高到256℃，脱除效率提高了30%以上.烟气温度较高时，利用雾化液滴的蒸发能替代添加蒸汽实现燃煤PM2.5的高效脱除. |
| 英文摘要 |
| The influence of two methods of gas moisture conditioning on removal efficiency of PM2.5 from coal combustion with addition of atomized droplets and steam was investigated. The particles size distribution and number concentration were measured in real time by electrical low pressure impactor (ELPI). The results show that collection efficiency of PM2.5 from coal combustion can be highly improved with steam condensational enlargement. Particle stage collection efficiency increases with the particles, especially for those smaller than 0.3 μm. The separation efficiency can be improved by 60% with the size of particles increasing from 0.03 μm to 0.3 μm for 0.1 kg/m3 of steam addition. The removal efficiency is independent of the gas temperature at the inlet of conditioning chamber for steam addition. But it increases with the gas temperature obviously for atomized droplets addition, which can be improved by 30% with increasing gas temperature from 136℃ to 256℃. High removal efficiency of PM2.5 from coal combustion can be obtained with atomized droplets evaporation in hot flue gas except for steam addition. |
