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, while the charring controls the combustion for the fine-grain dust.
Highlights
With the depleting fossil fuel resources, increasing environmental concerns, and political commitment, sustainable development has been a highly multi-disciplinary field [1], the recent two decades have already witnessed the booming development of biomass fuel feedstock, which has been employed as an alternative to the diminishing coal
A preliminary study on the effect of particle size on the combustion and explosion properties of grain dust is investigated to provide some basic experimental data in the security design of dust-explosion prevention and control, the cone calorimeter (CC) and TG are employed to illustrate the mechanisms of combustion kinetics firstly, and the following conclusions are drawn
(1) The Pmax and dP/dt increase from 0.36 to 0.49 MPa and from 6.05 to 12.12 MPa sÀ1, respectively, when the particle size of grain dust decreases from 80 mesh to 180 mesh
Summary
With the depleting fossil fuel resources, increasing environmental concerns, and political commitment, sustainable development has been a highly multi-disciplinary field [1], the recent two decades have already witnessed the booming development of biomass fuel feedstock, which has been employed as an alternative to the diminishing coal. Cereal residues as renewable and abundant resources, include both on-site residues and processing residues, have a huge potential to achieve more sustainable agriculture and to provide a novel fuel feedstock in theory [4]. The suspending grain dust in production departments is detrimental to life safety during liquor-making and starch processing, which holds potential hazard of fire or explosion due to its flammability and low density for forming an explosive cloud [5, 6, 7]. The necessary prevention and control of organic dust explosion are very imperative for safety production and property security, and the quantitative research on the potential explosion property is the prerequisite to designing some effective and efficient safeguards to minimize its security risk
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