ABSTRACT

In this study, experiments were performed on coal dust explosion (CDE) at different concentrations by using a 20 L spherical explosion device. Besides, the raw coal and solid residues of CDE were subjected to FTIR and XRD analyses. The aims are to investigate the changes of functional groups after CDE at different concentrations, the relationship between functional group consumption rate and explosion characteristic parameters, and the changes of inorganic minerals. The results show that during the CDE, various functional groups are consumed to varying degrees. Among the groups, the consumption of oxygen-containing functional groups is the most, followed by those of hydroxyl groups and aliphatic hydrocarbons, and that of aromatic hydrocarbons is the least. When the coal dust concentration is greater than 200 g/m³, the functional group consumption rate exceeds 50%; when the coal dust concentration exceeds 500 g/m³, the functional group consumption rate exceeds 90%. The total consumption of functional groups is positively correlated with the explosion pressure P_m, the growth rate of explosion pressure (dp/dt)_m, the flame propagation velocity V_F and the impulse I during the CDE experiments. Compared with raw coal, solid residues of CDE possess an increased content of minerals. The absorption peak area of minerals reaches a maximum of 10.28 (about 10 times of that for the raw coal) under the concentration of 700 g/m³. The main mineral components vary before and after the CDE. The main mineral components in the raw coal are quartz and kaolinite, while the main mineral components in the solid residues after CDE are quartz, calcium zeolite, wollastonite and magnesium oxide.

摘要

在本研究中，使用 20 L 球形爆炸装置对不同浓度的煤尘爆炸 (CDE) 进行了实验。此外，对 CDE 的原煤和固体残渣进行了 FTIR 和 XRD 分析。目的是研究不同浓度CDE后官能团的变化，官能团消耗率与爆炸特征参数的关系，以及无机矿物的变化。结果表明，在CDE过程中，各种官能团被不同程度地消耗。其中，含氧官能团的消耗量最大，其次是羟基和脂肪烃，芳香烃的消耗最少。当煤尘浓度大于200 g/m ^{3 时}，官能团消耗率超过50%；当煤尘浓度超过500g/m ^{3 时}，官能团消耗率超过90%。在CDE实验中，官能团的总消耗量与爆炸压力P _m、爆炸压力增长率( dp / d t ) _m、火焰传播速度V _F和脉冲I呈正相关。与原煤相比，CDE 固体残渣的矿物质含量更高。在700 g/m ³浓度下矿物质的吸收峰面积最大达到10.28（约为原煤的10倍）. 主要矿物成分在 CDE 前后各不相同。原煤中的主要矿物成分为石英和高岭石，CDE后固体残渣中的主要矿物成分为石英、钙沸石、硅灰石和氧化镁。