为评价瓦斯空气煤粉混合爆炸危险性大小,探究爆炸机理,方便相关事故原因分析,利用水平透明玻璃式爆炸管道,探究了甲烷浓度、煤粉粒径对复合爆炸中火焰传播速度的影响.实验结果表明:随着甲烷浓度的增大,火焰传播速度先增大后减小,在接近爆炸上限浓度和爆炸下限浓度时达到最大值;随着煤粉粒径的增大,火焰传播速度逐渐变小,最大火焰传播速度也变小,甲烷浓度为10%,煤粉粒径为30 μm时火焰传播速度最大.%In order to evaluate the potential hazard of coal dust explosion,explore the explosion mechanism,analysis the cause of related accidents,using level pipeline,formed experiment device,researched the effect of methane concentration and coal dust particle size on the flame propagation speed.Results show that with the increase of methane concentration, the flame propagation velocity increases first and then decreases, reaches the maximum value near the explosion limit concentration and minimum explosive concentration;with the increase of coal particle size, flame propagation speed becomes smaller, the maximum flame propagation velocity is smaller when the concentration is 10% and pulverized coal particle size is 30 μm.
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