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.
Coal dust explosion experiments were carried out in a 20 Lspherical explosive device using three kinds of coal dusts with different concentration,gas and solid residues of coal dust explosion were collected and analyzed.Based on the morphological characteristics of residue SEM images,the residues can be divided into three types：raw coal particles,similar-spherical cenosphere and broken-spherical cenosphere.The approximate ratios of each type of residues with different concentration were semi-quantitatively analyzed.As to the solid residues,the percentage of raw coal particles is the least and the residue is easy to agglomerate at concentration of 100g/m3,the percentage of similar-spherical cenosphere and broken-spherical cenosphere is higher at the optimal concentration of 300~400g/m3,the percentage of raw coal particles is higher at concentration of 700g/m3.Proximate analysis shows that after the coal dust explosion,the volatile and fixed carbon content decrease,the ash content obviously increases,and the moisture content changes little,their variation are closely related to the degree of coal metamorphism.As to the gas residues,with the increasing of coal dust concentration,φ（CO）,φ（H2）and the volume fraction of hydrocarbon gases show a rising trend,φ（CO2）firstly increases and then decreases.
出处
《中国矿业大学学报》
EI
CAS
CSCD
北大核心
2015年第5期823-828,共6页
Journal of China University of Mining & Technology
基金
国家自然科学基金项目(51174200)
