【摘要】：為確定爆破掘進面粉塵運移規(guī)律及設計1100工作面防塵系統(tǒng),開展風流分布、粉塵擴散、沉降及濃度時間變化實驗。1：1建立幾何模型,劃分并修改計算網(wǎng)格,優(yōu)選了RNG k-ε湍流模型,經(jīng)CFD軟件模擬得到至工作面距離L=0-60 m內(nèi)粉塵運移規(guī)律：巷道風速隨L遞增先升高而后降低；粉塵濃度隨垂高在0.5-4 m內(nèi)遞增而逐漸降低,隨L遞增先升高而后降低：粒徑為10μm以下粉塵均勻分布于空間,沉降量隨L遞增呈“減少-增高-減少-增高”趨勢,10-200μm之間沉降量隨L遞增呈“減少-增高-減少”趨勢,且90-200μm粉塵幾乎完全沉降；爆破初期5 min內(nèi),沿程粉塵濃度急劇下降,10-50 min內(nèi)下降趨勢平緩,高濃度區(qū)長時間在L=40 m之內(nèi),不沿巷道運移。L=10-20 m為風筒射流渦旋區(qū),粒徑為10-200μm沉降量偏少,粉塵濃度長時間較高。選用水霧與除塵風機聯(lián)合控塵,在L=24m、29m、34m處布置三組噴霧裝置形成水幕抑制粉塵擴散,風筒吸風口在L=15 m,于流場渦流中心形成負壓出口,更有利于空氣抽吸凈化。
[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.
【學位授予單位】：遼寧工程技術大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：TD714.4

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