爆破掘进空间内粉尘非稳态运移规律与防尘系统设计研究

发布时间：2018-12-11 05:05

【摘要】：为确定爆破掘进面粉尘运移规律及设计1100工作面防尘系统,开展风流分布、粉尘扩散、沉降及浓度时间变化实验。1：1建立几何模型,划分并修改计算网格,优选了RNG k-ε湍流模型,经CFD软件模拟得到至工作面距离L=0-60 m内粉尘运移规律：巷道风速随L递增先升高而后降低；粉尘浓度随垂高在0.5-4 m内递增而逐渐降低,随L递增先升高而后降低：粒径为10μm以下粉尘均匀分布于空间,沉降量随L递增呈“减少-增高-减少-增高”趋势,10-200μm之间沉降量随L递增呈“减少-增高-减少”趋势,且90-200μm粉尘几乎完全沉降；爆破初期5 min内,沿程粉尘浓度急剧下降,10-50 min内下降趋势平缓,高浓度区长时间在L=40 m之内,不沿巷道运移。L=10-20 m为风筒射流涡旋区,粒径为10-200μm沉降量偏少,粉尘浓度长时间较高。选用水雾与除尘风机联合控尘,在L=24m、29m、34m处布置三组喷雾装置形成水幕抑制粉尘扩散,风筒吸风口在L=15 m,于流场涡流中心形成负压出口,更有利于空气抽吸净化。
[Abstract]:In order to determine the law of dust movement in blasting tunneling face and to design dust control system in 1100 working face, experiments of air flow distribution, dust diffusion, sedimentation and time variation of concentration are carried out. A geometric model is established at 1:1, and the calculation grid is divided and modified. The RNG k- 蔚 turbulence model is selected, and the dust migration law within 0 ~ 60 m from the working face is obtained by CFD simulation: the wind speed of roadway increases first with the increase of L and then decreases; The dust concentration decreased gradually with the vertical height increasing within 0.5-4 m, and then decreased with the increase of L. The dust particle size below 10 渭 m distributed uniformly in space, and the deposition showed the trend of "decrease-increase-decrease-increase" with the increase of L. The deposition between 10-200 渭 m and 90-200 渭 m is almost completely deposited. During the first 5 min of blasting, the dust concentration along the course decreased sharply, and the decreasing trend was gentle within 10-50 min. The concentration of dust in the high concentration area was within 40 m long and did not move along the roadway. L10 ~ (-20 m) was the vortex area of the tuyere jet, and the settling amount of 10 ~ (-200) 渭 m was small. The dust concentration is high for a long time. In this paper, water mist and dust collecting fan are used to control dust, three groups of spray units are arranged at the place of 24m ~ 29m ~ (34 m) to form water curtain to restrain dust diffusion, and the air suction outlet is 15 m, and negative pressure outlet is formed in the swirl center of the flow field, which is more favorable for air suction and purification.
【学位授予单位】：辽宁工程技术大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TD714.4

【参考文献】