瓦斯爆炸炭黑结构及产生机理分析

瓦斯爆炸过程中视窗处出现的亮斑现象，分析确定为爆炸过程中产生的有高热辐射特性的炭黑。利用低温液氮吸附比表面积分析仪、扫描电镜（SEM）、透射电镜（TEM）和傅里叶红外光谱等方法，分析了瓦斯浓度下爆炸产生炭黑的孔径分布和表面结构。研究结果表明，炭黑的比表面积为1.507m2·g-1（DFT），总孔容为4×10-3cm3·g-1。SEM图像显示炭黑颗粒由大量球状物聚集体组成，直径在4~50μm。颗粒表面孔隙高度发育，部分表面有熔融烧结特征；TEM扫描结果显示形成聚集体的颗粒直径大都在100nm左右，粒子间彼此结合，形成链枝结构的炭黑聚集体，放大到8nm可以明显看到初级粒子内部有石墨状的晶格条纹；红外光谱分析结果表明炭黑颗粒内含有大量芳香烃结构，C-H、C-O结构、芳香族及取代苯官能团广泛存在。 

Soot Characteristic and Formation Mechanism in the Process of Gas Explosion

The phenomenon emerging some bright spots in observation window during gas explosion was analyzed.Results show that it is the soot particles with high thermal radiation property that yield this intense light.The characteristics of soot aperture and surface structure were investigated based on low-pressure nitrogen gas adsorption (LP-N2GA),scanning electron microscopy (SEM) and transmission electron microscopy (TEM) methods.The results show that soot particles possess a specific surface area of 1.507 m2 · g-1 (DFT) and pore volume of 4 × 10-3 cm3 · g-1.The images of SEM illustrate that the soot particle is composed of abundant spherical aggregations with a diameter range from 4 μm to 50 μm.The pores at the particle surface are well developed,some of the particles exhibits an ablation feature.The soot aggregates are botryoidal and some of primary particles bond together,the diameter of majority particles are of 100 nm from TEM images.The graphite layer with lattice fringes can be seen from the primary particles.The infrared spectroscopy analysis shows that soot particles contain a large amount of polycyclic aromatic hydrocarbon,aromatic series and other functional groups.