基于20L球形爆炸装置的煤尘爆炸残留物研究

发布时间：2018-10-13 13:54

【摘要】：采用20L球形爆炸装置进行煤尘爆炸实验,对3种煤尘在不同质量浓度下的爆炸气固态残留物进行了收集分析.通过对残留物SEM图像的形态特征分析,将残留物分为类原煤颗粒、类球形煤胞和残球形煤胞3类,半定量分析了3种形态残留物在不同质量浓度下的近似比例:在低质量浓度(100g/m3)时,残留物中类原煤颗粒所占比例最少且残留物容易结块,在最佳爆炸质量浓度(300~400g/m3)时类球形及残球形煤胞所占比例较高,高质量浓度(700g/m3)时类原煤颗粒所占比例较高.工业分析显示煤尘爆炸后挥发分、固定碳含量均减少,灰分含量大幅升高,水分含量变化较小,且变化量与煤尘变质程度密切相关.煤尘爆炸残留气体φ(CO),φ(H2)及烃类气体体积分数随煤尘质量浓度升高有上升趋势,φ(CO2)呈先升后降趋势.
[Abstract]:A 20L spherical explosive device was used to carry out the coal dust explosion experiment. The solid residue of explosion gas of three kinds of coal dust at different mass concentration was collected and analyzed. By analyzing the morphological characteristics of SEM images of residues, the residues were classified into three groups: coal particle, spherical coal cell and residual spherical coal cell, and the residue was classified into three types: raw coal particle, spherical coal cell and remnant spherical coal cell. The approximate proportion of three kinds of residues in different mass concentration was analyzed by semi-quantitative analysis: at low mass concentration (100g/m3), the proportion of coal-like particles in the residues was the least and the residues were easy to caking. At the best explosive mass concentration (300~400g/m3), the proportion of spherical and residual spherical coal cells is higher, and that of 700g/m3 is higher. The industrial analysis shows that after coal dust explosion, the fixed carbon content decreases, the ash content increases significantly, the water content changes little, and the change amount is closely related to the degree of coal dust metamorphism. The residual gas 蠁 (CO), 蠁 (H2) and the volume fraction of hydrocarbon gas increased with the increase of coal dust mass concentration, and 蠁 (CO2) increased first and then decreased.
【作者单位】：中国矿业大学安全工程学院煤矿瓦斯与火灾防治教育部重点实验室;
【基金】：国家自然科学基金项目(51174200)
【分类号】：TD714.5

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