论文部分内容阅读
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.
A 20 L spherical explosive device was used to carry out experiments on coal dust explosion, and the three kinds of coal dust were collected and analyzed for the explosive gas-solid residues at different mass concentrations.According to the morphological characteristics of the SEM images of residues, Particles, spherical-like cells and residual spherical coal cells. The semi-quantitative analysis of the approximate proportion of three kinds of residues at different concentrations: At low concentration (100g / m3), the type of raw coal particles Accounting for the least proportion and the residue easily caked, the proportion of spheroidal and pelleted coal cells is higher at the best explosive concentration (300 ~ 400g / m3), and the proportion of high-quality concentration (700g / m3) Accounting for a high proportion.Industrial analysis showed that volatile and fixed carbon content decreased after coal dust explosion, the ash content increased sharply, the moisture content changed little, and the variation was closely related to the coal dust metamorphism degree.The residual gas φ (CO), φ (H2) and the volume fraction of hydrocarbon gas increased with the rise of coal dust mass concentration, while φ (CO2) first increased and then decreased.