不同粒径肥煤及其爆炸残留物的爆炸条件和产物分析

Explosive Conditions and Products Analysis of Different Particle Sizes Fat Coal and Its Explosive Residue

采用20 L球形爆炸装置,实验了多种粒径煤尘及其爆炸残留物在不同煤尘浓度及点火能条件下的爆炸反应,分析了粒径对煤尘和固态残留物的爆炸条件(煤尘浓度、点火能量)和爆炸产物的影响。结果表明:随着煤尘粒径的增加,煤尘及其固态残留物爆炸需要更严格的爆炸临界条件;相比于点火能量,粒径对爆炸临界条件中的煤尘浓度影响较大;在爆炸临界条件下发生爆炸行为的爆炸产物中,小粒径煤尘及其爆炸残留物的孔洞发育程度及颗粒破碎程度远高于大粒径煤尘及其爆炸残留物,与大粒径及其固态残留物的爆炸产物相对比,小粒径煤尘及其固态残留物的爆炸产物O、Si元素的含量较高,而C元素含量较低。

Various particle sizes and its explosive residues were tested using 20 L spherical explosive device,and the effect of particle size on the explosive conditions and explosive products of coal dust and solid residues was analyzed under different coal dust concentrations and ignition energy conditions.The results show that with the increase of coal dust particle size,the explosion of coal dust and its solid residue requires more stringent explosive critical conditions(higher coal dust concentration and higher ignition energy);the degree of hole development and particle fragmentation is much higher than that of large particle size coal dust and its explosive residue,compared with the explosive product of large particle size and its solid residue,and the content of O,Si two elements and the content of C element is lower in the explosive product of small particle size coal dust and its solid residue.