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采用20 L钢制近球形爆炸特性测试系统,对低浓度瓦斯参与条件下、3种不同煤尘的爆炸下限变化规律进行了试验研究。研究发现:在本试验条件下,煤尘的爆炸下限浓度随瓦斯浓度的增加而逐渐下降;当瓦斯浓度在0~1.0%范围内,煤质组成成分对爆炸下限影响较大,相应的瓦斯和煤尘共存的爆炸复合体系表现为“强煤尘”性;当瓦斯浓度大于1%时,煤尘爆炸下限浓度的数值差异不大,煤质成分对煤尘爆炸下限的影响不再明显,相应的瓦斯煤尘共存的复合爆炸体系表现为“强瓦斯”性。
A 20 L steel near-spherical explosion testing system was used to study the variation of the lower explosion limit of three different coal dusts with the participation of low concentration gas. The results show that under the test conditions, the lower explosive concentration of coal dust gradually decreases with the increase of gas concentration; when the gas concentration is in the range of 0-1.0%, the coal quality components have a greater impact on the lower explosive limit, and the corresponding gas and When the gas concentration is greater than 1%, there is not much difference in the lower limit of the concentration of coal dust explosion, and the influence of coal composition on the lower limit of coal dust explosion is no longer obvious , The corresponding composite gas and coal dust explosion system manifested as “strong gas ” sex.