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首页> 外文期刊>Journal of loss prevention in the process industries >Experimental investigation of methane/coal dust explosion under influence of obstacles and ultrafine water mist
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Experimental investigation of methane/coal dust explosion under influence of obstacles and ultrafine water mist

机译：障碍物和超细水雾影响下甲烷/煤尘爆炸的实验研究

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Experimental investigations were performed on mitigating methane coal dust-mixture explosion in the presence of obstacles using ultra-fine water mists to reveal the effects of the obstacles and water mist. The explosion pressure and temperature history were obtained through PCB piezo-electronic pressure transducers and fast-response thermocouples, respectively. A Fastcam Ultima APX high-speed video camera was used to visualize both the explosion process and its mitigation. The LaVision laser diagnostic system was employed to measure the blast flow field considering the obstacles and ultrafine water mist, wherein the coal dust particles were considered the tracer particles. The results show that the explosion is primarily influenced by the number, shape, and installed locations of the obstacles; the reinforcement effect of the square ring is stronger than that of the column ring. The maximum explosion pressure, explosion temperature, and increase rate of pressure decrease by employing the ultrafine water mist, though the obstacles affect the suppression efficiency. In the explosion flow field, the dust particles distribute evenly in the explosion tube when the ultrafine water mist is not employed. The vortex of the flow field is unclear, whereas the vortex of the flow field becomes apparent in the presence of the ultrafine water mist. The results of this study can be helpful in guiding the design of water-mist systems for mitigating the risk of accidents in mines or other related areas and provide valuable data for model development. (C) 2017 Elsevier Ltd. All rights reserved.
机译：在使用超细水雾存在障碍物的情况下，对减轻甲烷粉尘混合物爆炸进行实验研究，以揭示障碍物和水雾的影响。通过PCB压电电子压力传感器和快速响应热电偶分别获得爆炸压力和温度历史。 FastCAM Ultima APX高速摄像机用于可视化爆炸过程及其缓解。采用LAVISION激光诊断系统来测量考虑障碍物和超细水雾的喷射流场，其中煤尘颗粒被认为是示踪剂颗粒。结果表明，爆炸主要受到障碍物的数量，形状和安装位置的影响;方环的加固效果比柱环的强化效果强。通过采用超细水雾，最大爆炸压力，爆炸温度和增加压力降低速度，尽管障碍物影响了抑制效率。在爆炸流场中，当不采用超细水雾时，灰尘颗粒在爆炸管中均匀地分布。流场的涡流尚不清楚，而在超细水雾存在下，流场的涡流变得显而易见。本研究的结果有助于引导水雾系统的设计，以减轻矿山或其他相关领域的事故风险，并为模型开发提供有价值的数据。 （c）2017 Elsevier Ltd.保留所有权利。

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