管道内瓦斯煤尘共混爆炸温度特性

采用瞬态火焰传播实验系统，对7%，8%，9%，10%和11%的瓦斯体积浓度分别与不同浓度的长焰煤煤尘混合，并使用直径25 μm的Pt/Rh13-Pt微细热电偶测量温度，揭示受限空间内瓦斯与煤尘混合爆炸温度特性。结果表明:煤尘浓度一定时，随着瓦斯浓度的增加，爆炸温度先增加后减小;纯瓦斯浓度在10%时爆炸温度最高，加入煤尘后的混合体系中，瓦斯浓度为9%时爆炸温度最高;瓦斯浓度不变时，随着煤尘浓度的增加，爆炸温度一直减小;7%~11%瓦斯分别与130 g/m3煤尘混合爆炸后测得最高温度分别为1 333.6，1 475.4，1 511.4，1 455.6，1 396.4 ℃;与9%纯瓦斯爆炸相比，9%瓦斯与130，260，520，780 g/m3煤尘混合爆炸后测得最高温度分别降低7.2%，11.5%，15.0%和22.9%。结论得到的瓦斯煤尘共混爆炸温度数据可为煤矿灾害高温防护提供参考依据。

Explosion temperature characteristics of mixed gas and coal dust in pipeline

Using the experimental system of transient flame propagation,the gas with the volume concentration of 7%,8%,9%,10%,and 11% was mixed with the coal dust of long flame coal with different concentrations respectively.Meanwhile,the temperature was measured using a Pt/Rh13 Pt thermocouple with a diameter of 25 μm,and the mixed explosion temperature characteristics of gas and coal dust in the confined space was revealed.The results showed that the explosion temperature increased first and then decreased with the increasing gas concentration under the constant concentration of coal dust.When the pure gas concentration was 10%,the explosion temperature was the highest.In the mixed system after adding the coal dust,the explosion temperature was the highest when the gas concentration was 9%.When the gas concentration was constant,the explosion temperature decreased with the increase of coal dust concentration.The measured highest temperatures of mixture explosion with 7%-11% gas and 130 g/m3 coal dust was 1 333.6,1 475.4,1 511.4,1 455.6 and 1 396.4 ℃,respectively.Compared to the 9% pure gas explosion,the measured maximum temperature of mixed explosion with 9% gas and 130,260,520,780 g/m3 coal dust decreased by 7.2%,11.5%,15.0%,and 22.9%,respectively.The temperature data of mixed explosion of gas and coal dust can provide reference for the high temperature protection of coal mine disasters.