Study on combustion mechanism of micron-sized aluminum powder in hydrogen/water vapor atmosphere

doi:10.16265/j.cnki.issn1003-3033.2023.S1.2479

Abstract

Abstract:

In order to study the explosion risk of the gas-powder two-phase system contained in the production and processing of aluminum products, the combustion mechanism of aluminum powder in humid environments was revealed. The microscopic reaction process of micron-sized aluminum powder in a hydrogen/water vapor atmosphere was simulated based on Chemkin software. According to the gas phase combustion mechanism of aluminum powder, a kinetic model of a chemical reaction containing 28 components (Al, O, AlO, AlO₂, AlH, etc.,) and 68-step elementary reactions was constructed. By varying the mole ratio of water vapor to air, the effects of water vapor content on the sensitivity of combustion temperature, as well as the mole fraction and maximum rate of production of key free radicals were analyzed. The results show that according to the temperature sensitivity analysis, the increase in water vapor content will reduce the combustion temperature of micron-sized aluminum powder when reaching equilibrium. Specifically, the key elementary reaction R32 (Al + H₂O = AlOH + H), which affects the combustion temperature at equilibrium, changes from promoting the temperature rise at the beginning and then suppressing the temperature rise to completely suppressing the temperature rise. According to the analysis of the rate of production, the increase in water vapor content reduces the mole fraction of O and AlO free radicals when reaching equilibrium. According to the reaction path analysis, the key reaction path of micron-sized aluminum powder during combustion in a hydrogen/water vapor atmosphere is obtained, among which Al→O, Al→AlO, Al₂O₂→AlO, and other elementary reactions are strong.

Key words: micron-sized aluminum powder, hydrogen/water vapor atmosphere, combustion mechanism, elementary reactions, Chemkin simulation calculation

ZHANG Shulin, YAN Xiang, LONG Ruiji, LU Yi, SHI Shiliang. Study on combustion mechanism of micron-sized aluminum powder in hydrogen/water vapor atmosphere[J]. China Safety Science Journal, 2023, 33(S1): 196-202.

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