Explosive property and combustion kinetics of grain dust with different particle sizes

Heliyon
JiangPing ZhaoYujiu Han

Abstract

The effect of particle size on the combustion and explosion properties of grain dust is investigated by Hartmann tube, cone calorimeter (CC), and thermogravimetry (TG), it aims to provide fundamental experimental data of grain dust for an in-depth study on its potential risk. The fine-grain dust facilitates the decrease in the minimum ignition temperature (MIT) of dust layer and dust cloud, as well as the obvious increases in the maximum explosion pressure Pmax (climbs from 0.36 to 0.49 MPa) and pressure rising rate dP/dt (rises from 6.05 to 12.12 MPa s-1), leading to the increases in maximum combustion rate (dw/dτ)max and combustion characteristic index S, corresponding to the greater or severer potential risk. Because the E corresponding to combustion increases from 106.05 (sample with a particle size of 180-1250 μm) to 153.45 kJ mol-1 for the sample of 80-96 μm, the combustion process gradually transforms from diffusion-controlled into a kinetically controlled mode with the decreasing particle size of grain dust, together with the retardation of initially transient charring. It determines that the competition between the charring and combustion dominates the decomposition, and the combustion prevails for the coarse particle,...Continue Reading

References

Jun 13, 2002·Bioresource Technology·Ye Sun, Jiayang Cheng
Nov 8, 2015·Journal of Hazardous Materials·Emmanuel Kwasi AddaiUlrich Krause
Sep 14, 2017·Bioresource Technology·Shukra Raj PaudelJae Woo Lee
Jun 20, 2019·Journal of Hazardous Materials·Chuyuan HuangShifei Shen

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