Maximum explosive particles size of iron air suspension
https://doi.org/10.22227/0869-7493.2024.33.03.5-10
Abstract
Introduction. The well-known results of experimental study of the minimum explosive concentration (MEC) polydisperse iron dust air suspension in a 1-m3 chamber (Clouthier, Taveau, Dastidar et al., 2019) and a 20-L chamber (Cashdollar, 1994) are considered. An analysis of these results at a qualitative level, carried out by the authors of these studies, showed that the maximum size of iron particles dcr responsible for the explosion hazard belongs to the range from 30 microns to 75 microns. The task is to clarify the dcr based on a quantitative analysis of the results of the study in a 1-m3 chamber by the known method (Poletaev, 2014).
Selection and processing of initial data. For two polydisperse iron specimens with different MEC in a 1-m3 chamber (MEC1 = 250 g/m3 for a fine specimen and MEC2 = 1,250 … 1,500 g/m3 for a coarse specimen), continuous particle size distribution functions are constructed: F1(d) and F2(d), respectively. Here, F(d) is the mass fraction specimen particles having size less than d.
Estimation of dcr and discussion of the result. Following the procedure of the quantitative dcr estimation method, the equation F1(dcr)/F2(dcr) = MEC2/MEC1 was solved in a visual graphical form. The result of the solution: dcr = 36 ± 3 microns. The obtained quantitative result significantly clarified the known qualitative assessment of the dcr.
Conclusions. The ability of polydisperse air suspension of iron dust to spread the flame (i.e. its explosiveness) is determined by the content of fine fraction “less than dcr”. The minimum amount of this fraction should exceed the value of about 150 g/m3.
About the Author
N. L. Poletaev
All-Russian Research Institute for Fire Protection of Ministry of Russian Federation for Civil Defense, Emergencies and Elimination of Consequences of Natural Disasters
Russian Federation
Russian Federation
Nikolay L. POLETAEV, Dr. Sci. (Eng.), Leading Researcher
VNIIPO, 12, Balashikha, Moscow Region, 143903
RISC AuthorID: 1093620
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Review
For citations:
Poletaev N.L. Maximum explosive particles size of iron air suspension. Pozharovzryvobezopasnost/Fire and Explosion Safety. 2024;33(3):5-10. (In Russ.) https://doi.org/10.22227/0869-7493.2024.33.03.5-10
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