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首页> 外文期刊>Journal of Hazardous Materials >Ignition behavior of magnesium powder layers on a plate heated at constant temperature
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Ignition behavior of magnesium powder layers on a plate heated at constant temperature

机译：恒温加热板上镁粉层的着火行为

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摘要

The minimum temperature at which dust layers or deposits ignite is considered to be very important in industries where smoldering fires could occur. Experiments were conducted on the self-ignition behavior of magnesium powder layers. The estimated effective thermal conductivity k for modeling is 0.17 W m~(-1) K~(-1). The minimum ignition temperature (MIT) of magnesium powder layers for four different particle sizes: 6,47,104 and 173 μm, are also determined in these experiments. A model was developed describing temperature distribution and its change over time while considering the melting and boiling of magnesium powder. Parameter analysis shown that increasing particle size from 6 to 173 μm increased MIT from 710 to 760 K, and increased thickness of the dust layer led to a decreased MIT. The calculation termination time more than 5000 s didn't significantly impact MIT. Comparing predicted and experimental data showed satisfactory agreement for MIT of magnesium powder layers at various particle sizes. According to the ignition process of magnesium powder layer, a meaningful definition for the most sensitive ignition position (MSIP) was proposed and should be taken into consideration when preventing smoldering fires induced by hot plates.
机译：在可能发生阴燃的工业中，粉尘层或沉积物着火的最低温度被认为非常重要。对镁粉层的自燃行为进行了实验。用于建模的估计有效导热系数k为0.17 W m〜（-1）K〜（-1）。在这些实验中，还确定了四种不同粒径（分别为6,47,104和173μm）的镁粉层的最低着火温度（MIT）。建立了一个描述温度分布及其随时间变化的模型，同时考虑了镁粉的熔化和沸腾。参数分析显示，将粒径从6增大到173μm，可使MIT从710 K增大到760 K，而增加粉尘层的厚度则可降低MIT。计算终止时间超过5000 s不会对MIT产生重大影响。比较预测数据和实验数据表明，在各种粒径下，镁粉层的MIT令人满意。根据镁粉层的着火过程，提出了最敏感的着火位置（MSIP）的有意义的定义，在防止由热板引起的闷烧时应予以考虑。

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  • 来源
    《Journal of Hazardous Materials》 |2013年第15期|283-290|共8页
  • 作者

    Yuan Chunmiao; Huang Dezheng; Li Chang; Li Gang;

  • 作者单位

    Fire & Explosion Protection Laboratory, Northeastern University, Shenyang 110819, China;

    Liaoning Nonferrous Metal Prospecting Institute, Shenyang 110013, China;

    Department of Civil Engineering, Shenyangjianzhu University, Shenyang 110168, China Fire & Explosion Protection Laboratory, Northeastern University, Shenyang 110819, China;

    Fire & Explosion Protection Laboratory, Northeastern University, Shenyang 110819, China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    magnesium powder; dust layer; hot-surface; minimum ignition temperature;

    机译：镁粉;灰尘层热表面最低点火温度;

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