Abstract Sodium bicarbonate (NaHCO3) was used to suppress the explosion of polyethylene (PE) dust. The maximum explosion pressure, flame propagation behaviour, and the minimum ignition temperature of PE dust mixed with NaHCO3 powder were measured, aiming to evaluate the suppression effect of NaHCO3 on PE dust explosion. The results showed that NaHCO3 powder can effectively suppress PE dust explosions and the suppression effect increases gradually as the inert ratio increases. PE dust explosions can be suppressed by NaHCO3 through physical and chemical mechanisms. From the physical aspect, the thermal decomposition of NaHCO3 particles can effectively absorb heat from the flame front of PE dust. From the chemical aspect, the Na-containing species generated can effectively react with and scavenge the radicals in the PE flame, especially the O radical. Both the rate of chain reaction and the rate of heat release are then decreased, leading to an effective suppression effect.

中文翻译：

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碳酸氢钠抑制聚乙烯粉尘爆炸

摘要 碳酸氢钠（NaHCO3）被用于抑制聚乙烯（PE）粉尘的爆炸。测量了混有NaHCO3粉末的PE粉尘的最大爆炸压力、火焰传播行为和最低着火温度，旨在评估NaHCO3对PE粉尘爆炸的抑制效果。结果表明，NaHCO3粉体能有效抑制PE粉尘爆炸，并且随着惰性比的增加，抑制效果逐渐增强。NaHCO3 可以通过物理和化学机制抑制 PE 粉尘爆炸。从物理方面来看，NaHCO3颗粒的热分解可以有效地吸收PE粉尘火焰锋面的热量。从化学方面来说，生成的含钠物质可以有效地与PE火焰中的自由基反应并清除自由基，尤其是O自由基。