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首页> 外文期刊>Journal of loss prevention in the process industries >Effect of flame propagation regime on pressure evolution of nano and micron PMMA dust explosions
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Effect of flame propagation regime on pressure evolution of nano and micron PMMA dust explosions

机译：火焰传播制度对纳米和微米PMMA粉尘爆炸压力演化的影响

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摘要

Experiments using an open space dust explosion apparatus and a standard 20 L explosion apparatus on nano and micron polymethyl methacrylate dust explosions were conducted to reveal the differences in flame and pressure evolutions. Then the effect of combustion and flame propagation regimes on the explosion overpressure characteristics was discussed. The results showed that the flame propagation behavior, flame temperature distribution and ion current distribution all demonstrated the different flame structures for nano and micron dust explosions. The combustion and flame propagation of 100 nm and 30 mu m PMMA dust clouds were mainly controlled by the heat transfer efficiency between the particles and external heat sources. Compared with the cluster diffusion dominant combustion of 30 mu m dust flame, the premixed-gas dominant combustion of 100 nm dust flame determined a quicker pyrolysis and combustion reaction rate, a faster flame propagation velocity, a stronger combustion reaction intensity, a quicker heat release rate and a higher amount of released reaction heat, which resulted in an earlier pressure rise, a larger maximum overpressure and a higher explosion hazard class. The complex combustion and propagation regime of agglomerated particles strongly influenced the nano flame propagation and explosion pressure evolution characteristics, and limited the maximum overpressure.
机译：进行使用开放空间粉尘爆炸装置的实验和纳米和微米聚甲基粉末粉尘爆炸上的标准20L爆炸装置，以揭示火焰和压力进化的差异。然后讨论了燃烧和火焰传播制度对爆炸过压特征的影响。结果表明，火焰传播行为，火焰温度分布和离子电流分布均证明了纳米和微粉粉尘的不同火焰结构。 100nm和30μmmmmmmma粉尘云的燃烧和火焰传播主要由粒子和外部热源之间的传热效率控制。与30μm粉尘火焰的簇扩散主导燃烧相比，预混合气体的粉碎燃烧为100nm粉尘火焰确定更快的热解和燃烧反应速率，更快的火焰传播速度，更强的燃烧反应强度，更快的热释放速率和较高量的释放反应热量，导致较早的压力升高，最大的超压和更高的爆炸危险类。聚集颗粒的复杂燃烧和传播制度强烈影响纳米火焰繁殖和爆炸压力进化特性，并限制了最大的过压。

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