Effects of Void Scale of Coal Accumulation on Methane-Air Flame Propagation and Overpressure Dynamics

Xiaowen Li; Qingzhao Li; Guiyun ZhangPengfei ZhuXinxin LiuXu Ma

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Effects of Void Scale of Coal Accumulation on Methane-Air Flame Propagation and Overpressure Dynamics

机译：Effects of Void Scale of Coal Accumulation on Methane-Air Flame Propagation and Overpressure Dynamics

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With the coal mining toward depth, there is an increased probability of gas explosion accidents. While the propagation characteristics of gas explosion on account of goaf environment have not been determined yet, which has great significance for the prevention of the goaf fire spreading to working face. This paper investigates the critical void scale of coal piles that allowed for the propagation of gas explosion flames using a closed duct with the dimensions of 100 × 20 × 10 cm. The void ratios of the stacked coals varied in 0.554, 0.521, 0.492, and 0.471. The results show that the increased flame speed in the coal accumulations poses a greater explosion hazard. While the smaller coal particle sizes are more advantageous for the suppression effect on flame velocity. The explosion duration is inversely proportional to the void ratio, which mainly depends on the void diffusion stage and the flame extinction stage. Moreover, the maximum overpressure and (dP/dt)_(max) of the explosions attenuate with the decrease in the void scale. The critical void ratio of coal accumulation is between 0.47 and0.49 for premixed methane-air flame with an equivalence ratio of 1. The irregular coal geometry makes flame quenching easier. The void-scale effect of accumulations on flame propagation should be fully considered in the explosion prevention works.

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《Combustion science and technology》 |2023年第8期|1202-1220|共19页
作者
Xiaowen Li; Qingzhao Li; Guiyun ZhangPengfei ZhuXinxin LiuXu Ma;
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作者单位

Key Laboratory of Gas and Fire Control for Coal Mines of Ministry of Education, China University of Mining and Technology, Xuzhou, Jiangsu, China, School of Safety Engineering, China University of Mining and Technology, Xuzhou, Jiangsu, China;

School of Safety Engineering, China University of Mining and Technology, Xuzhou, Jiangsu, China;

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正文语种英语
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Coal mine goaf; gas explosion; void scale; flame propagation; overpressure dynamics;

Effects of Void Scale of Coal Accumulation on Methane-Air Flame Propagation and Overpressure Dynamics

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