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Frictional ignitions in underground bituminous coal operations 1983 to 2005

机译：1983年至2005年地下烟煤作业中的摩擦点火

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A statistical study of available data regarding frictional ignitions in the United States from 1983 to 2005 was conducted by the National Institute for Occupational Safety and Health (NIOSH) to determine and define conditions controlling their occurrence (MSHA, 2006a; MSHA, 2006b; and MSHA, 2006c). Frictional ignitions are defined as the ignition of a flammable mixture of methane and air that is initiated by frictional heating. Ignitions created through the addition of energy from open flames and exposed electrical circuits are not included in this analysis. Energy released in a roof fall that creates a spark and ignites a methane mixture would be considered a frictional ignition. Frictional ignitions represent the majority of all ignitions in underground coal mines. Over the study period of 1983 to 2005, a total of 1,993 ignitions were reported in underground bituminous coal mines in the United States, of which 1,589 were frictional ignitions. Reportable ignitions to the U.S. Mine Safety and Health Administration (MSHA) are any unintentional occurrences of flame underground regardless of duration. Continuous miners represented the largest source for frictional ignitions with 1,090 (68.6% of all frictional ignitions). Longwall mining operations represented the highest concentration of frictional ignitions during this study period with 1,365 frictional ignitions (85.9% of all frictional ignitions). From 1983 to 1991, underground productivity and the number of frictional ignitions increased. However, productivity continued to increase from 1991 to 2000 while total frictional ignitions fell, thereby disproving this connection between productivity and frequency of frictional ignitions. Ninety percent of all frictional ignitions occurred in underground coal mines that liberated more than 393 L/s (1.2 MMcfd million cubic feet per day) of methane through the main ventilation system. Although methane production is not the determining factor for the occurrence of frictional ignitions, it is a good indicator of the anticipated frequency. [PUBLICATION ABSTRACT]
机译：美国职业安全与健康研究所（NIOSH）对1983年至2005年美国有关摩擦着火的可用数据进行了统计研究，以确定并定义了控制其发生的条件（MSHA，2006a； MSHA，2006b；和MSHA ，2006c）。摩擦点火定义为由摩擦加热引发的甲烷和空气易燃混合物的点火。该分析不包括因明火和裸露的电路增加能量而产生的点火。屋顶倒塌释放的产生火花并点燃甲烷混合物的能量被认为是摩擦点火。摩擦点火占地下煤矿所有点火的大部分。在1983年至2005年的研究期间，美国地下沥青煤矿总共报告了1,993次点火，其中1,589次为摩擦点火。向美国矿山安全与健康管理局（MSHA）报告的点火是任何无意发生的地下火焰，无论持续时间如何。连续矿工是摩擦点火的最大来源，为1,090人（占所有摩擦点火的68.6％）。在本研究期内，长壁开采作业是摩擦点火的最高集中点，共产生1,365个摩擦点火（占所有摩擦点火的85.9％）。从1983年到1991年，地下生产率和摩擦引燃次数增加。但是，从1991年到2000年，生产率一直在增加，而总的摩擦点火却下降了，从而证明了生产率与摩擦点火频率之间的这种联系。所有摩擦点火的百分之九十发生在地下煤矿中，这些煤矿通过主要通风系统释放出超过393 L / s（每天1.2 MMcfdd百万立方英尺）的甲烷。尽管甲烷的产生不是产生摩擦着火的决定因素，但它是预期频率的良好指标。 [出版物摘要]

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  • 来源
    《Mining Engineering》 |2009年第8期|p.28-35|共8页
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    R B Krog S J Schatzel;

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    R.B. KROG AND S.J. SCHATZELR.B. Krog, member SME, and S.J. Schatzel, are mining engineer and research geologist, respectively, with the Pittsburgh Research Laboratory, National Institute for Occupational Safety and Health (NIDSH), Pittsburgh, PA. Paper number TP-08-031. Original manuscript submitted July 2008. Revised manuscript accepted for publication March 2008. Discussion of this peer-reviewed and approved paper in invited and must be submitted to SME Publications Dept. prior to Nov. 30, 2009.;

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