發(fā)布時(shí)間：2018-05-14 05:38

  本文選題：薄煤層 + 掘進(jìn)工作面��； 參考：《中國(guó)礦業(yè)大學(xué)》2017年碩士論文

【摘要】：薄煤層掘進(jìn)工作面作業(yè)空間狹小和施工進(jìn)度快的特點(diǎn),加重了粉塵聚集和粉塵濃度超限。本文以-290m掘進(jìn)工作面工況條件為基礎(chǔ),研究了氣幕控塵技術(shù)改善巷道粉塵濃度超標(biāo)問題。通過理論分析,得出粉塵向巷道后方運(yùn)移的主要?jiǎng)恿κ秋L(fēng)流的運(yùn)動(dòng)。掘進(jìn)工作面風(fēng)流包括射流區(qū)、順流區(qū)、渦流區(qū)、逆轉(zhuǎn)區(qū),最有利的通風(fēng)方式為“U”形附壁層流。利用Fluent建立氣-固兩相流模型,得出供風(fēng)量增大到250m~3/min時(shí),風(fēng)流射流區(qū)長(zhǎng)度和風(fēng)筒出風(fēng)口距迎頭面的長(zhǎng)度相近,粉塵分布區(qū)域減小。當(dāng)Lf=6m時(shí),司機(jī)位置處所受擾動(dòng)風(fēng)速減小,回風(fēng)流攜帶粉塵對(duì)其影響較小。同時(shí),截割頭擾動(dòng)風(fēng)速的增大,也會(huì)加大粉塵向掘進(jìn)機(jī)方向運(yùn)移的距離,增大掘進(jìn)機(jī)扒裝煤巖作業(yè)的逸塵擴(kuò)散范圍。掘進(jìn)機(jī)產(chǎn)塵量的增大,直接引起巷道平均粉塵濃度增大。且截割頭產(chǎn)塵量J超過120mg/s時(shí),掘進(jìn)機(jī)司機(jī)位置和后端行人作業(yè)區(qū)的呼吸性粉塵的濃度均嚴(yán)重超出國(guó)家規(guī)定安全作業(yè)環(huán)境值。氣幕開啟后形成沖擊射流,包含自由射流區(qū)、射流沖擊區(qū)和附壁射流區(qū),分析氣幕出風(fēng)口寬度與氣幕卷吸風(fēng)量的變化關(guān)系,可通過選擇較小出風(fēng)口寬度,提高煤層掘進(jìn)工作面氣幕出風(fēng)口風(fēng)速來實(shí)現(xiàn)氣幕卷吸風(fēng)量的要求。當(dāng)出口風(fēng)速Vq=7.0m/s時(shí),掘進(jìn)機(jī)司機(jī)位置處粉塵濃度較低。后端行人作業(yè)區(qū)X1整體大于后端行人作業(yè)區(qū)X2的粉塵濃度,表明粉塵高濃度區(qū)域被控制在回風(fēng)側(cè)巷幫附近,氣幕控制效率最高。單獨(dú)增大回風(fēng)側(cè)導(dǎo)流氣幕風(fēng)機(jī)的長(zhǎng)度會(huì)降低掘進(jìn)機(jī)司機(jī)位置和后端行人作業(yè)區(qū)的粉塵濃度。當(dāng)回風(fēng)側(cè)導(dǎo)流氣幕風(fēng)機(jī)長(zhǎng)度LFz2=3m時(shí),掘進(jìn)面氣幕控制效果明顯。對(duì)比氣幕開啟前后,掘進(jìn)機(jī)司機(jī)位置處粉塵濃度下降76.92%,降為3.597mg/m~3,達(dá)到國(guó)家規(guī)定的安全作業(yè)限值。以礦井濕式除塵實(shí)驗(yàn)平臺(tái)為基礎(chǔ)進(jìn)行試驗(yàn)研究得出:氣幕出風(fēng)口寬度、風(fēng)速及傾角分別為0.02m、7m/s、10°時(shí),氣幕控塵效率最高達(dá)到82.3%,與理論分析和數(shù)值模擬結(jié)果相吻合。
[Abstract]:The characteristics of narrow working space and fast construction progress in thin coal seam driving face aggravate dust accumulation and dust concentration exceeding limit. Based on the working conditions of -290m tunneling face, this paper studies the improvement of dust concentration in roadway by air curtain control technology. Through theoretical analysis, it is concluded that the main driving force of dust moving to the rear of roadway is the movement of wind and flow. The wind flow in tunneling face includes jet zone, downstream area, eddy current area and reverse zone. The most favorable ventilation mode is "U" type wall attached laminar flow. The gas-solid two-phase flow model is established by using Fluent. When the air supply volume increases to 250m~3/min, the length of the air-flow jet zone and the length of the tuyere outlet from the head to the head are similar, and the dust distribution region decreases. When Lf=6m, the disturbance wind speed at the driver's position decreases, and the dust carried by the return air flow has little effect on it. At the same time, the increase of cutting head disturbance wind speed will also increase the distance of dust moving to the roadheader, and increase the dust diffusion range of roadheader bagging coal and rock operation. The increase of dust production of roadheader directly results in the increase of average dust concentration in roadway. When the dust yield of cutting head exceeds 120mg/s, the concentration of respiratory dust in the roadheader driver's position and in the rear pedestrian operation area is seriously higher than the value of safe working environment stipulated by the state. An impinging jet is formed after the opening of the air curtain, including the free jet zone, the jet impingement zone and the wall attached jet zone. The relationship between the air curtain outlet width and the air volume of the air curtain entrainment can be analyzed by selecting the smaller air outlet width. To improve the wind speed of air curtain outlet in coal seam driving face to meet the demand of air curtain entrainment. When the outlet wind speed is Vq=7.0m/s, the dust concentration at the driver's position of the roadheader is lower. The dust concentration of the back-end pedestrian area X1 is larger than that of the back-end pedestrian area X2, which indicates that the dust concentration area is controlled near the backwind side lane, and the air curtain control efficiency is the highest. Increasing the length of the air curtain on the backwind side alone will reduce the dust concentration in the roadheader driver's position and the back-end pedestrian operation area. When the length of air curtain is LFz2=3m, the control effect of air curtain is obvious. Compared with before and after the opening of the air curtain, the dust concentration at the driver's position of the roadheader dropped 76.92% to 3.597mg / mm3, which reached the limit of safety operation stipulated by the state. Based on the experimental platform of wet dust removal in coal mine, it is concluded that when the width of air curtain outlet, wind speed and inclination angle are 0.02 m / s / s 10 擄respectively, the maximum dust control efficiency of air curtain reaches 82.3%, which is consistent with the theoretical analysis and numerical simulation results.
【學(xué)位授予單位】：中國(guó)礦業(yè)大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TD714.4

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