Abstract
Starch is one type of biomass fuel raw material commonly used, but presents deflagration hazards when suspended in the air. Dust deflagration accidents might be effectively inhibited by creating a gas inerting atmosphere. In this work, the evolution of starch deflagration flame in the inhibitory gas atmosphere N2 or CO2 was investigated. Under the action of inerting gas, heterogeneous combustion is strengthened, the flame propagation velocity is reduced and the acceleration trend is smooth. The maximum flame temperature is decreased and fluctuation after reaching the maximum value is weakened. According to the micro characterization of deflagration residues, after injecting inhibitory gas, more amorphous carbon is protected and the carbon layer formed has a smaller crystal size, some easily oxidized functional groups in starch are maintained during the deflagration. Meanwhile, carbon content and the original chemical bond ratio in the residues are also increased. In addition, experimentally measured the maximum limit inerting ratios of CO2 and N2 are chosen as 33% and 54%, respectively. On this basis, safety application for gas inerting technology in practical processes was discussed.
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