Impact of coal dust concentration on gas explosion in vertical pipelines

doi:10.16265/j.cnki.issn1003-3033.2020.03.003

Abstract

Abstract: In order to study impact of coal dust concentration on gas explosion, experiments were conducted in a self-built vertical pipeline with coal dust concentration of 25, 50, 100 and 200 g/m³ and volume fraction of 9%. Then, change features of gas explosion pressure and flame propagation in explosion chamber and pipeline were analyzed. The results show that as coal dust concentration increases, mixed explosion pressure decreases. Explosion pressure in chambers and pipelines have different sensitivity to coal dust, with the former one being more sensitive to high-concentration coal dust while the latter more sensitive to low-concentration coal dust. It is also found that participation of coal dust can promote development of flames in chambers and pipelines, and an increase in its concentration mainly affects flame development in rear section of chambers, but can obviously promote flame development in pipelines which reaches the fastest as the concentration is 50 g/m³.

Key words: vertical pipeline, coal dust concentration, explosion pressure, explosion chamber, flame propagation

CLC Number:

X936

JING Guoxun, ZHANG Shengqi, DUAN Xinwei, GUO Shaoshuai, LIU Chuang. Impact of coal dust concentration on gas explosion in vertical pipelines[J]. China Safety Science Journal, 2020, 30(3): 15-20.

References

[1] 贾智伟, 刘彦伟, 景国勋. 瓦斯爆炸冲击波在管道拐弯情况下的传播特性[J]. 煤炭学报, 2011,36(1): 97-100.
JIA Zhiwei, LIU Yanwei, JING Guoxun. Propagation characteristic about shock wave of gas explosion at laneway corner [J]. Journal of China Coal Society, 2011,36(1): 97-100.
[2] 贾智伟, 许胜铭, 景国勋. 瓦斯爆炸冲击波在单向分叉管道内的传播规律试验研究[J]. 中国安全科学学报, 2015,25(12): 51-55.
JIA Zhiwei, XU Shengming, JING Guoxun. Experimental study on propagation law of gas explosion shock wave in one-way bifurcated pipeline [J]. China Safety Science Journal, 2015,25(12): 51-55.
[3] LIN Baiquan, GUO Chang, SUN Yumin, et al. Effect of bifurcation on premixed methane-air explosion overpressure in pipes [J]. Journal of Loss Prevention in the Process Industries, 2016, 43: 464-470.
[4] ZHU Chuanjie, GAO Zishan, LU Ximiao, et al. Experimental study on the effect of bifurcations on the flame speed of premixed methane/air explosions in ducts [J]. Journal of Loss Prevention in the Process Industries, 2017, 49: 545-550.
[5] 赵丹, 齐昊, 潘竞涛, 等. 不同类型管道内瓦斯爆炸冲击波传播试验研究[J]. 中国安全科学学报, 2018,28(3): 79-83.
ZHAO Dan, QI Hao, PAN Jingtao, et al. Experimental study on gas explosion shock wave propagation indifferent types of pipelines [J]. China Safety Science Journal, 2018,28(3): 79-83.
[6] 余明高, 纪文涛, 温小萍, 等. 交错障碍物对瓦斯爆炸影响的实验研究[J]. 中国矿业大学学报, 2013,42(3): 349-354.
YU Minggao, JI Wentao, WEN Xiaoping, et al. Experimental study of the influence of staggered obstacles on gas explosion [J]. Journal of China University of Mining and Technology, 2013,42(3): 349-354.
[7] 尉存娟, 谭迎新, 张建忠, 等. 不同间距障碍物下瓦斯爆炸特性的实验研究[J]. 中北大学学报:自然科学版, 2015,36(2):188-190,196.
YU Cunjuan, TAN Yingxin, ZHANG Jianzhong, et al. Experimental research on blast characters of methane under obstacle with different distance [J]. Journal of North University of China:Natural Science Edition, 2015,36(2):188-190,196.
[8] 陈鹏, 李艳超, 黄福军, 等. 方孔障碍物对瓦斯火焰传播影响的实验与大涡模拟[J]. 爆炸与冲击, 2017,37(1): 21-26.
CHEN Peng, LI Yanchao, HUANG Fujun, et al. LES approach to premixed methane/air flame propagating in the closed duct with a square-hole obstacle [J]. Explosion and Shock Waves, 2017,37(1): 21-26.
[9] LIU Yi, SUN Jinhua, CHEN Dongliang. Flame propagation in hybrid mixture of coal dust and methane [J]. Journal of Loss Prevention in the Process Industries, 2007, 20(4): 691-697.
[10] 王新, 李润之, 张延松. 瓦斯爆炸引起沉积煤尘爆炸传播实验研究[J]. 中国安全科学学报, 2009,19(4): 73-77.
WANG Xin, LI Runzhi, ZHANG Yansong. Experimental study on the propagation laws of gas explosion inducing coal dust explosion [J]. China Safety Science Journal, 2009, 19(4): 73-77.
[11] 蔡周全, 罗振敏, 程方明. 瓦斯煤尘爆炸传播特性的实验研究[J]. 煤炭学报, 2009,34(7): 938-941.
CAI Zhouquan, LUO Zhenmin, CHENG Fangming. Experimental study on propagation characteristics of gas/coal dust explosion [J]. Journal of China Coal Society, 2009, 34(7): 938-941.
[12] BAI Chunhua, GONG Guangdong, LIU Qingming, et al. The explosion overpressure field and flame propagation of methane/air and methane/coal dust/air mixtures [J]. Safety Science, 2011, 49(10): 1 349-1 354.
[13] 汪泉, 沈兆武, 郭子如, 等. 内铺煤粉方管内瓦斯预混火焰传播特性[J]. 煤炭学报, 2012,37(10): 1 693-1 697.
WANG Quan, SHEN Zhaowu, GUO Ziru, et al. Flame propagation characteristics for premixed methane-air with coal-dust in square tube [J]. Journal of China Coal Society, 2012, 37(10): 1 693-1 697.
[14] 尉存娟, 谭迎新, 胡双启, 等. 瓦斯爆炸诱导瓦斯-煤尘二次爆炸的试验研究[J]. 中国安全科学学报, 2014,24(12): 29-32.
YU Cunjuan, TAN Yingxin, HU Shuangqi, et al. Experimental research on secondary blasting of coal dust and gas induced by gas explosion[J]. China Safety Science Journal, 2014, 24(12): 29-32.
[15] 魏嘉, 闻利群. 瓦斯与煤尘混合物爆炸特性数值模拟仿真[J]. 中北大学学报:自然科学版, 2015,36(2): 208-213.
WEI Jia, WEN Liqun. Numerical simulation of gas and coal dust explosive characteristics [J]. Journal of North University of China:Natural Science Edition, 2015, 36(2): 208-213.
[16] AJRASH M J, ZANGANEH J, MOGHTADERI B. Methane-coal dust hybrid fuel explosion properties in a large scale cylindrical explosion chamber [J]. Journal of Loss Prevention in the Process Industries, 2016, 40: 317-328.
[17] 李海涛, 陈晓坤, 邓军, 等. 湍流状态下竖直管道内甲烷-煤尘预混特征及爆炸过程数值模拟[J]. 煤炭学报, 2018,43(6): 1 769-1 779.
LI Haitao, CHEN Xiaokun, DENG Jun, et al. Numerical simulation on the premix properties and explosion process of methane/coal dust mixture in a vertical pipeline under turbulent flow [J]. Journal of China Coal Society, 2018,43(6): 1 769-1 779.