Chen Xiaokun, Lu Kunlun, Xiao Yang, Su Bin, Wang Yuanyuan, Zhao Tenglong
College of Safety Science and Engineering, Xi'an University of Science and Technology, Xi'an, Shaanxi 710054, P.R. China.
College of Chemistry and Environmental Engineering, Sichuan University of Science and Engineering, Zigong, Sichuan 643000, P.R. China.
ACS Omega. 2021 Dec 30;7(1):617-628. doi: 10.1021/acsomega.1c05224. eCollection 2022 Jan 11.
To characterize the inhibiting effects of sodium bicarbonate (NaHCO) on aluminum dust, the inhibiting capacities of NaHCO and its solid product sodium carbonate (NaCO) on the explosions of 10 and 20 μm aluminum dusts were studied using a standard 20 L spherical chamber. Explosion parameters were analyzed based on the induction period and explosion stage to evaluate the inhibiting effects. The results show that the induction period of 10 μm aluminum dust explosion is 18.2 ms, which is shorter than that of 20 μm aluminum dust. Two aluminum dust explosions can be completely inhibited during the induction period when inert ratios of NaHCO are 350 and 150%, respectively, but that is not observed after adding the corresponding amount of NaCO. When the inert ratio ranges from 0 to 150%, the physical effect of NaHCO on 10 μm aluminum is poor and the chemical effect is the essential process. But as the inert ratio increased from 200% to 350%, the physical effect of NaHCO is higher than the chemical effect, suggesting that the physical effect is the key factor. With the increase of NaHCO, the physical effect increases gradually. However, the chemical effect changes little. The physical effects of NaHCO including heat absorption and isolation play an essential role in the inhibiting process, which has a significant impact on the pyrolysis process and explosion parameters. The results of the present work provide guidance for the prevention and control of aluminum dust explosions.
为了表征碳酸氢钠（NaHCO₃）对铝粉的抑制作用，采用标准的20L球形试验舱研究了NaHCO₃及其固体产物碳酸钠（Na₂CO₃）对10μm和20μm铝粉爆炸的抑制能力。基于诱导期和爆炸阶段分析爆炸参数，以评估抑制效果。结果表明，10μm铝粉爆炸的诱导期为18.2ms，短于20μm铝粉的诱导期。当NaHCO₃的惰化率分别为350%和150%时，在诱导期内两次铝粉爆炸均可被完全抑制，但加入相应量的Na₂CO₃后未观察到该现象。当惰化率在0至150%范围内时，NaHCO₃对10μm铝粉的物理作用较差，化学作用是主要过程。但随着惰化率从200%增加到350%，NaHCO₃的物理作用高于化学作用，表明物理作用是关键因素。随着NaHCO₃用量的增加，物理作用逐渐增强。然而，化学作用变化不大。NaHCO₃的物理作用包括吸热和隔离，在抑制过程中起重要作用，对热解过程和爆炸参数有显著影响。本研究结果为铝粉爆炸的预防和控制提供了指导。
