喷雾对促进细颗粒物声波团聚的影响

发布时间：2018-05-30 21:00

本文选题：气溶胶 + 喷雾　；参考：《化工学报》2017年03期

【摘要】：以燃煤烟气为对象,实验研究了各参数对喷雾促进声波团聚的影响。结果表明,添加喷雾后,声波团聚效率提高了25%~40%。无论有无喷雾,声波团聚均存在相同的最佳频率,为1400 Hz左右。较低液气比时,团聚效率随液气比的增加而明显增大,但超过0.10后,团聚效率趋于稳定。添加喷雾时,团聚效率随停留时间的增加而提高,但达到4.2 s时基本达到最大值。分析了喷雾提高团聚效率的机理,在喷雾作用下,颗粒之间形成比范德华力更强的液桥力,增大了有效碰撞系数;同时,雾化液滴的加入为气溶胶团聚提供了种子颗粒,周围的细颗粒易与之发生碰撞团聚,使团聚效率提高。研究表明,喷雾方法可以大幅降低声波团聚工艺的操作能耗。
[Abstract]:The effects of various parameters on the agglomeration of acoustic waves by spray were studied with coal-fired flue gas as an experimental object. The results showed that the agglomeration efficiency increased by 25%. The optimum frequency of acoustic agglomeration is about 1400 Hz regardless of spray. When the ratio of liquid to gas is lower, the agglomeration efficiency increases obviously with the increase of the ratio of liquid to gas, but the agglomeration efficiency tends to be stable when the ratio of liquid to gas is higher than 0.10. The agglomeration efficiency increased with the increase of residence time, but reached the maximum at 4.2 s. The mechanism of increasing agglomeration efficiency by spray was analyzed. Under the action of spray, a stronger liquid bridge force was formed between particles than van der Waals force, and the effective collision coefficient was increased, and the addition of atomized droplets provided seed particles for aerosol agglomeration. It is easy to collide and agglomerate with the surrounding fine particles, so that the agglomeration efficiency is improved. The results show that the operation energy consumption of acoustic agglomeration process can be greatly reduced by spray method.
【作者单位】：中国计量大学能源工程研究所;
【基金】：国家自然科学基金项目(51408574) 浙江省“仪器科学与技术”重中之重学科人才培育计划项目浙江省自然科学基金项目(LY13E060007)~~
【分类号】：X701

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