细水雾作用下原木燃烧烟尘沉降研究

Study on the sedimentation of log combustion smoke particles with application of water mist

介绍细水雾除尘的机理。设计原木室内燃烧实验,研究细水雾对原木燃烧烟尘颗粒的沉降作用。改变细水雾工作压力、启动时间、施加时间,设计不同工况,分析各工况下烟尘颗粒的表面密度及平均直径。通过电子显微镜扫描原木燃烧产生的灰尘颗粒样本,利用统计分析的方法得到细水雾作用前后烟尘颗粒特征参数的变化规律。不同工况下实验结果表明,细水雾小液滴的粒径越小、速度越快、滞空时间越长,对原木燃烧产生的烟尘颗粒沉降效果越好;细水雾工作压力越大,烟尘颗粒沉降越迅速。

The mechanism of dust elimination by water mist was introduced. The sedimentation of log combustion smoke parti- cles by water mist was studied by an indoor combustion experi- ment. The scenarios were set by different working pressure, start--up time and impose time of water mist, the surface den- sity and average diameter of smoke particle under different sce- narios were analyzed. The characteristic parameters of smoke particle before or after effect of water mist were analyzed by SEM and statistical method. By contrastive analysis, it was showed that the smaller size of water mist droplet leaded to the faster speed and longer hover time, which was better to the sedimentation of the smoke particles. The greater pressure of the water mist leaded to the quick sedimentation of smdke particles.