Minimum explosive concentration of coal dust cloud in the coexistence of gas and coal dust
-
摘要: 近年来瓦斯煤尘共存条件下的爆炸事故呈多发趋势。运用20 L爆炸特性测试系统，对瓦斯煤尘共存复合体系的爆炸特性进行实验研究，得到了瓦斯在不同点火能量、静止及湍流状态下的爆炸下限，以及不同条件下煤尘的爆炸下限。结果表明：随着瓦斯浓度的增加，煤尘的爆炸下限呈指数衰减；瓦斯浓度存在某临界点，高于此临界点，复合体系爆炸过程中瓦斯起主导作用，表现为"强瓦斯"性，反之，煤尘起主导作用，表现为"强煤尘"性。研究结论为有效预防煤矿井下瓦斯煤尘共存爆炸事故提供重要的理论依据。Abstract: The present work was carried for the prevention of increasingly ever prevalent gas explosion accidents that had occurred in the coexistence of gas and coal dust in recent years. Using a 20 L explosion test system, we studied experimentally the explosive characteristics of the coexisting gas and coal dust and obtained the lower limit of gas explosion under different ignition energies, static and turbulent conditions and the lower limit concentration of coal dust explosion under different conditions. The results show that with the increase of gas concentration, the minimum explosive concentration of coal dust cloud decreases exponentially and that there is a critical gas concentration, in higher than which gas plays a leading role in the process of explosion, shown as the so-called "strong gas". Otherwise, coal dust plays the leading role, which is characterized by the "strong coal dust". The conclusions can serve as an important theoretical basis for preventing the coal mine gas and coal dust explosion.
-
图 6 瓦斯对煤尘爆炸下限的影响
Figure 6. Influence of gas on lower limit of explosive coal dust concentration
表 1 煤尘的工业分析结果
Table 1. Industrial analytic results of coal dusts
煤样 Vad/% Mad/% Aad/% Fcad/% 1# 37.45 3.15 14.81 44.59 2# 13.76 1.89 21.93 62.42 3# 22.13 3.18 48.15 26.64 
下载: 导出CSV
表 2 不同瓦斯浓度下煤尘的爆炸下限
Table 2. Minimum explosive concentration of coal dust at different gas concentrations
φCH4/% 煤尘爆炸下限/(g·m-3) 1# 2# 3# 0 28.40 37.78 73.20 0.4 27.18 42.90 0.6 19.60 24.80 1.0 16.20 21.70 20.10 1.3 10.27 8.43 7.43 1.6 5.43 3.17 2.0 2.47 2.51 2.5 2.24
下载: 导出CSV
-
[1] TORRENT J G, FUCHS J C. Flammability an explosion propagation of methane-coal dust hybrid mixtures[C]//Proceedings of International Conference of Safety in Mines Research Institute. Pretoria, South Africa, 1989, 23: 11-15. [2] AMYOTTE P R, MINTZ K J, PEGG M J, et al. Laboratory investigation of the dust explosibility characteristics of three Nova Scotia coals[J]. Journal of Loss Prevention in the Process Industries, 1991, 4(2):102-109. doi: 10.1016/0950-4230(91)80014-L [3] AMYOTTE P R, MINTZ K J, PEGG M J, et al. The ignitability of coal dust-air and methane-coal dust-air mixtures[J]. Fuel, 1993, 72(5):671-679. doi: 10.1016/0016-2361(93)90580-U [4] 曹卫国, 黄丽媛, 梁济元, 等.球形密闭容器中煤粉爆炸特性参数研究[J].中国矿业大学学报, 2014, 43(1):113-119. http://www.cqvip.com/QK/93316X/201401/48639335.htmlCAO Weiguo, HUANG Liyuan, LIANG Jiyuan, et al. Research on characteristic parameters of coal dust explosion in a spherical sealed container[J]. Journal of China University of Mining & Technology, 2014, 43(1):113-119. http://www.cqvip.com/QK/93316X/201401/48639335.html [5] 樊保龙. 大尺度条件下甲烷-空气和煤尘-空气混合及爆炸特性研究[D]. 北京: 北京理工大学, 2015. http://cdmd.cnki.com.cn/Article/CDMD-10007-1015029612.htm [6] 李江波. 密闭管内甲烷-煤粉复合爆炸实验研究[D]. 辽宁大连: 大连理工大学, 2010. http://cdmd.cnki.com.cn/Article/CDMD-10007-1015029612.htm [7] 陈东梁. 甲烷/煤尘复合火焰传播特性及机理的研究[D]. 合肥: 中国科学技术大学, 2007. http://www.wanfangdata.com.cn/details/detail.do?_type=degree&id=Y1078000 [8] 侯万兵. 煤尘-瓦斯混合物爆炸压力研究[D]. 太原: 中北大学, 2010. http://www.wanfangdata.com.cn/details/detail.do?_type=degree&id=D315187 [9] 国家技术监督局. 粉尘云爆炸下限浓度测定方法: GB/T16425-1996[S]. 北京: 中国标准出版社, 1996. [10] Standard practice for determining limits of flammability of chemicals at elevated temperature and pressure: ASTM E918-83[S]. American Society for Testing Materials, 1999. [11] 赵衡阳.气体和粉尘爆炸原理[M].北京:北京理工大学出版社, 1996. -
点击查看大图
图(6) / 表(2)
计量
- 文章访问数: 5582
- HTML全文浏览量: 1457
- PDF下载量: 201
- 被引次数: 0