Journal
POWDER TECHNOLOGY
Volume 367, Issue -, Pages 206-212Publisher
ELSEVIER
DOI: 10.1016/j.powtec.2020.03.049
Keywords
PE dust explosion; NaHCO3; Flame propagation behaviour; Minimum ignition temperature; Suppression mechanism
Categories
Funding
- National Natural Science Foundation of China [51874120, 51504083, 51904094]
- Program for Science & Technology Innovation Talents in Universities of Henan Province [19HASTIT042]
- Research Foundation for Youth Scholars of Higher Education of Henan Province [2017GGJS053]
- Fundamental Research Funds for the Universities of Henan Province [NSFRF1606]
- Program for Innovative Research Team in University of Ministry of Education of China [IRT_16R22]
- Programfor Innovative Research Team of Henan Polytechnic University [T2018-2]
- Foundation for Distinguished Young Scientists of Henan Polytechnic University [J2017-3]
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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 name, 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. (C) 2020 Published by Elsevier B.V.
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