School of Chemical Engineering, Dalian University of Technology, Dalian, Liaoning, 116024, PR China.
School of Chemical Engineering, Dalian University of Technology, Dalian, Liaoning, 116024, PR China.
J Hazard Mater. 2020 Jul 5;393:122524. doi: 10.1016/j.jhazmat.2020.122524. Epub 2020 Mar 18.
The inhibition effects of gas inhibitors (nitrogen, carbon dioxide, and heptafluoropropane) on aluminum dust explosion were investigated experimentally and numerically. The results showed that as the inhibition volume fraction increased, the flame propagation characteristics parameters and explosion severity parameters were inhibited by inert gases accordingly. The inhibition performance of carbon dioxide was superior to that of nitrogen, and the minimum inhibition volume fractions of nitrogen and carbon dioxide were determined. XRD results indicated that the crystal form of major condensed product of aluminum dust explosion using two kinds of inert gas as inhibitors was different due to the distinct inhibition effect. Moreover, the XPS analysis revealed that the nitrogen oxide of aluminum adsorbed on the surface of aluminum particles blocked gasification process of aluminum particles. To explore the inhibition mechanism microscopically, a kinetic model concerning gas phase combustion was established. The above discussion indicated that the inhibition effect was the combination of multiple factors. In addition, due to the strong reactions between aluminum particles and heptafluoropropane, it cannot be regarded as gas inhibitor in aluminum dust explosion.
实验和数值研究了气体抑制剂（氮气、二氧化碳和七氟丙烷）对铝粉尘爆炸的抑制作用。结果表明，随着抑制体积分数的增加，惰性气体相应地抑制了火焰传播特性参数和爆炸严重程度参数。二氧化碳的抑制性能优于氮气，确定了氮气和二氧化碳的最小抑制体积分数。XRD 结果表明，由于抑制效果的明显差异，两种惰性气体作为抑制剂时铝粉尘爆炸的主要冷凝产物的晶体形态不同。此外，XPS 分析表明，吸附在铝颗粒表面的铝颗粒上的氮氧化物阻止了铝颗粒的气化过程。为了从微观上探讨抑制机制，建立了一个涉及气相燃烧的动力学模型。上述讨论表明，抑制效果是多种因素共同作用的结果。此外，由于铝颗粒与七氟丙烷之间的强烈反应，它不能作为铝粉尘爆炸中的气体抑制剂。
