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首页> 外文会议>ASME/JSME thermal engineering joint conference;AJTEC2011 >EXPERIMENTAL STUDY ON CHARACTERISTICS OF METHANE-COAL DUST MIXTURE EXPLOSION AND ITS MITIGATION BY ULTRA-FINE WATER MIST
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EXPERIMENTAL STUDY ON CHARACTERISTICS OF METHANE-COAL DUST MIXTURE EXPLOSION AND ITS MITIGATION BY ULTRA-FINE WATER MIST

机译：超细水雾对甲烷-煤粉混合气爆炸特性及其缓和特性的实验研究

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摘要

This paper presents the results of experimental investigation on characteristics of methane-coal dust mixture explosion and its mitigation by ultra-fine water mist. Four E12-1-K type fast response thermocouples, two PCB piezotronic pressure transducers were used to obtain the temperature and pressure history of methane-coal dust mixture explosion and its mitigation by ultra-fine water mist, while a GigaView High-speed camera was used to visualize the processes. Different methane concentrations, coal dust concentrations, diameters of coal particles and volumes of ultra-fine water mist were considered for their effects on methane-coal dust mixture explosion. The temperature of explosion flame, the maximum explosion overpressure, the maximum rate of overpressure rise, and the critical volume flux of ultra-fine water mist were experimentally determined. The results show that the characteristics of the methane-coal dust mixture explosion and the mitigating efficiency by ultra fine water mist are influenced by the methane concentration, the coal dust concentration, the coal dust diameter and the applied volume flux of ultra-fine water mist. For example, both the maximum explosion overpressure and rate of overpressure rise increased with increasing of coal dust concentrations and methane concentrations. All of the test cases indicate that ultra-fine water mist can mitigate the mixture explosion and suppress the flame propagation efficiently from the images record by high speed video camera.
机译：本文介绍了甲烷-煤尘混合气爆炸特性及其超细水雾缓解特性的实验研究结果。使用四个E12-1-K型快速响应热电偶，两个PCB压电压力传感器来获取甲烷-煤尘混合物爆炸的温度和压力历史记录，以及通过超细水雾减轻爆炸的温度和压力历史记录，同时使用GigaView高速摄像头用于可视化流程。考虑了不同的甲烷浓度，煤尘浓度，煤颗粒直径和超细水雾体积对甲烷-煤尘混合物爆炸的影响。实验确定了爆炸火焰的温度，最大爆炸超压，最大超压上升速率和超细水雾的临界体积通量。结果表明，甲烷-煤尘混合气的爆炸特性和超细水雾的减缓效率受甲烷浓度，煤尘浓度，煤尘直径和超细水雾的施加量通量的影响。 。例如，最大爆炸超压和超压上升速率都随煤尘浓度和甲烷浓度的增加而增加。所有的测试案例都表明，超细水雾可以减轻混合物爆炸并有效地抑制高速摄像机拍摄的图像中的火焰传播。

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