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Optimization of spray dust suppression device in return air tunnel of a coal mine based on CFD technology

机译：基于CFD技术的煤矿返回空气隧道喷涂抑制装置的优化

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摘要

A wet and dry dual-purpose dust reduction device was developed to reduce the level of harm caused to mineworkers by the respirable dust generated in a fully mechanized working face in a coal mine, and specifically those workers located in the return airway [1]. First, spraying experiments were carried out to generate data showing an efficient dust reduction effect. Then, the data obtained from the experiments were imported into computational fluid dynamics (CFD) software for the numerical simulation of spraying [2]. The influence of the outward extension distance of the nozzle (Ls) and the spraying pressure (Pw) on the coverage capacity of the dust capture mesh and the distribution of the spray field was determined. According to the experiments, the optimal nozzles were 2.4-mm round-orifice nozzles with X-shaped flow guide cores. When Ls = 25 cm and Pw = 7 MPa, the spray field covered the dust capture mesh to the greatest degree, and effective dust reduction was achieved. Field application and measurements were carried out in the return airway of the 117 fully mechanized working face of Jinjitan Coal Mine, China. The dust reduction efficiency was found to reach 90.25%. Following the reduction in dust, the concentrations of respirable dust in the return airway at distances of 20, 50, and 80 m from the fully mechanized working face were 0.250, 0.203, and 0.179 mg/m3, respectively. As a result, the dust pollution problem in the return airway was effectively solved, and the airway environment was significantly improved.
机译：开发了一种潮湿和干燥的两用除尘装置，以减少煤矿综合机械化工作面上产生的可吸入粉尘对矿井造成的危害程度，特别是那些位于返回气道的工作人员[1]。首先，进行喷涂实验以产生显示有效的除尘效果的数据。然后，从实验中获得的数据被导入计算流体动力学（CFD）软件，用于喷射的数值模拟[2]。测定喷嘴（LS）和喷射压力（PW）对灰尘捕获网格的覆盖容量的影响和喷射场的分布的影响。根据实验，最佳喷嘴是2.4mm圆形孔喷嘴，具有X形导流芯。当LS = 25厘米和PW = 7MPa时，喷射场覆盖了灰尘捕获网格到最大程度，并且实现了有效的防尘。现场申请和测量是在中国金坛煤矿的117综采工作面的返回气道中进行的。发现除尘效率达到90.25％。在减少灰尘之后，距离螺母距离距离机械化工作面20,50和80μm的返回气道中可吸入灰尘的浓度分别为0.250,0.203和0.179mg / m 3。结果，返回气道的粉尘污染问题得到了有效解决，气道环境得到了显着改善。

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  • 来源
    《Building and Environment》 |2021年第10期|108059.1-108059.16|共16页
  • 作者

    Zhang Shaobo; Nie Wen; Guo Cheng; Peng Huitian; Ma Qingxin; Xu Changwei; Zhang Hao; Liu Qingyue;

  • 作者单位

    Shandong Univ Sci & Technol Coll Safety & Environm Engn Qingdao 266590 Peoples R China|Shandong Univ Sci & Technol State Key Lab Min Disaster Prevent & Control Cofo Qingdao 266590 Peoples R China;

    Shandong Univ Sci & Technol Coll Safety & Environm Engn Qingdao 266590 Peoples R China|Shandong Univ Sci & Technol State Key Lab Min Disaster Prevent & Control Cofo Qingdao 266590 Peoples R China;

    Shandong Univ Sci & Technol Coll Safety & Environm Engn Qingdao 266590 Peoples R China|Shandong Univ Sci & Technol State Key Lab Min Disaster Prevent & Control Cofo Qingdao 266590 Peoples R China;

    Shandong Univ Sci & Technol Coll Safety & Environm Engn Qingdao 266590 Peoples R China|Shandong Univ Sci & Technol State Key Lab Min Disaster Prevent & Control Cofo Qingdao 266590 Peoples R China;

    Shandong Univ Sci & Technol Coll Safety & Environm Engn Qingdao 266590 Peoples R China|Shandong Univ Sci & Technol State Key Lab Min Disaster Prevent & Control Cofo Qingdao 266590 Peoples R China;

    Shandong Univ Sci & Technol Coll Safety & Environm Engn Qingdao 266590 Peoples R China|Shandong Univ Sci & Technol State Key Lab Min Disaster Prevent & Control Cofo Qingdao 266590 Peoples R China;

    Shandong Univ Sci & Technol Coll Safety & Environm Engn Qingdao 266590 Peoples R China|Shandong Univ Sci & Technol State Key Lab Min Disaster Prevent & Control Cofo Qingdao 266590 Peoples R China;

    Shandong Univ Sci & Technol Coll Safety & Environm Engn Qingdao 266590 Peoples R China|Shandong Univ Sci & Technol State Key Lab Min Disaster Prevent & Control Cofo Qingdao 266590 Peoples R China;

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  • 原文格式 PDF
  • 正文语种 eng
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  • 关键词

    Dust pollution; Return airway; Spraying dust reduction; Numerical simulation;

    机译：粉尘污染;返回气道;喷涂除尘;数值模拟;

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