摘要
为防治矿井排风口的粉尘对矿区周边大气环境的污染问题,基于流体动力学、气液耦合和喷雾降尘及振弦栅除尘理论,运用计算流体动力学(CFD)三维数值模拟方法,优化振弦栅与高压喷雾协同作用下除尘特性参数,研究不同雾化压力对雾滴粒径分布及质量浓度分布的影响,分析振弦栅直径及间距对雾滴拦截效果、风速对双层振弦栅水膜作用特征。结果表明:随着雾化压力增大,雾滴粒径逐渐变小且分布集中化,雾化压力超过8 MPa后雾滴粒径分布变化不明显;不同间距的振弦栅均对流场有截流作用并伴有严重回流现象,而间距为5 mm的振弦栅对粒径较小的雾滴拦截效果更好;当进口风速为3 m/s时振弦栅表面形成水膜效果最佳,更利于粉尘捕集;模拟数据与试验结果变化趋势基本一致。
In order to prevent and control pollution of dust from outlet of mine to surrounding atmospheric environment of mining area,based on theory of fluid dynamics,gas-liquid coupling and spray dust reduction and vibrating wire grid dust removal,computational fluid dynamics(CFD)threedimensional numerical simulation method was used,dust removal characteristic parameters under synergistic effect of vibrating wire grid and high-pressure spray were optimized,effects of different atomization pressures on particle size distribution and mass concentration distribution of droplets were studied.Effects of diameter and spacing of vibrating string grid on droplets intercepting effect and effects of wind speed on water film of double-layer vibrating string grid were analyzed.The results show that with the increase of atomization pressure,the particle size of droplets decreases gradually and distribution becomes centralized.When atomization pressure exceeds 8 MPa,particle size distribution of droplets does not change significantly.Vibrating-string grids with different spacing have effect of blocking flow field and serious backflow phenomenon,while vibrating-string grids with spacing of 5 mm have the better effect of intercepting droplets with smaller particle size.When inlet wind speed is 3 m/s,water film on the surface of vibrating grating has the best effect,which is more conducive to dust collection.Variation trend of simulated data is basically consistent with experimental results.
作者
丁厚成
连志虚
邓权龙
蒋仲安
杨利炜
葛梦圆
DING Houcheng;LIAN Zhixu;DENG Quanlong;JIANG Zhongan;YANG Liwei;GE Mengyuan(School of Construction Engineering,Anhui University of Technology,Ma'anshan,Anhui 243002,China;School of Civil and Resource Engineering,University of Science and Technology Beijing,Beijing 100083,China)
出处
《中国安全科学学报》
CAS
CSCD
北大核心
2021年第6期106-112,共7页
China Safety Science Journal
基金
安徽省自然科学基金资助(1808085ME161)
安徽高校自然科学研究项目(KJ2019A0052)
大学生创新创业项目(202010360043,S201910360232)。
关键词
振弦栅
雾化压力
协同作用
湿式除尘
数值模拟
vibrating wire grid
atomization pressure
synergistic action
wet dust removal
numerical simulation
