Peng Lei, Ji Wentao, Zhang Ying, Tian Runmeng
School of Energy Science and Engineering, Henan Polytechnic University, Jiaozuo 454000, China.
College of Safety Science and Engineering, Henan Polytechnic University, Jiaozuo 454000, China.
ACS Omega. 2024 Jun 21;9(26):27969-27975. doi: 10.1021/acsomega.3c10468. eCollection 2024 Jul 2.
This study aims at extensively investigating the explosion characteristics of a hybrid mixture of gas and coal dust. Accordingly, the standard 20 L spherical explosion system was applied to measure parameters such as the lower explosion limit, maximum explosion pressure, and index of the hybrid mixture of different concentrations of gas and coal dust. Moreover, different coal dust particle sizes and components were measured. With regard to coal dust with different particle sizes and components, the obtained results revealed that, while the addition of gas significantly reduced the lower explosion limit, the maximum explosion pressure and index were increased; that is to say, the presence of gas will increase the explosion risk of coal dust. However, under conditions in which the particle size of the coal dust was large or the volatile content was low, the addition of gas was found to lead to a higher decrease of the lower explosion limit; this is, while the maximum explosion pressure and explosion index were increased. Consequently, gas can be argued to have a greater influence on the explosion risk of coal dust with a large particle size or low volatile content. Furthermore, regardless of the particle size or the volatile content of coal dust, the maximum explosion pressure and explosion index of the hybrid mixture were observed to be higher than that of the pure coal dust but lower than that of the pure gas. That is to say, the explosion intensity of the gas/coal dust composite system is higher than that of pure coal dust but less than that of pure gas. The research results can provide theoretical basis for coal mine explosion disaster prevention and control and have important significance.
本研究旨在广泛调查瓦斯与煤尘混合气体的爆炸特性。为此，采用标准的20L球形爆炸系统来测量不同浓度瓦斯与煤尘混合气体的爆炸下限、最大爆炸压力和爆炸指数等参数。此外，还测量了不同煤尘粒径和成分。对于不同粒径和成分的煤尘，所得结果表明，瓦斯的加入显著降低了爆炸下限，但最大爆炸压力和爆炸指数增加；也就是说，瓦斯的存在会增加煤尘的爆炸风险。然而，在煤尘粒径较大或挥发分含量较低的条件下，发现瓦斯的加入会导致爆炸下限有更高程度的降低；此时，最大爆炸压力和爆炸指数增加。因此，可以认为瓦斯对粒径较大或挥发分含量较低的煤尘的爆炸风险影响更大。此外，无论煤尘的粒径或挥发分含量如何，混合气体的最大爆炸压力和爆炸指数均高于纯煤尘，但低于纯瓦斯。也就是说，瓦斯/煤尘复合系统的爆炸强度高于纯煤尘，但低于纯瓦斯。研究结果可为煤矿爆炸灾害防治提供理论依据，具有重要意义。
