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Evaluation of the Explosion Hazard of Powders by the Maximum Explosion Pressure and Maximum Rate of Explosion Pressure Rise II. Methods for Testing the Powder Explosion Characteristics

  • POWDER METALLURGY INDUSTRY AND MANAGERIAL ECONOMICS
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Powder Metallurgy and Metal Ceramics Aims and scope

A method for assessing the powder explosibility was developed using analysis of dispersed powder distribution in reaction vessels, combustion propagation, and comparative tests of atomizers. Dependences of the maximum explosion pressure on the concentration of dispersed particles and oxygen content in mixtures with nitrogen and other inert gases determined with a 4-L experimental facility of the Frantsevich Institute for Problems of Materials Science (IPM) were examined. The experimental data were used to study the effect of reaction vessel sizes on the maximum explosion pressure and maximum rate of explosion pressure rise. The applicability of the cube root law for geometrically similar vessels, the similarity criteria for dispersed gas flows (including the homochronism criterion for turbulent flows) being obeyed, was shown. The metal powders were categorized in accordance with the modified explosion index based on combustibility and explosibility characteristics and calculated in relative units with regard to the explosion hazard of silicon powders. The irregular gas distribution substantially affected the accuracy of the explosion characteristics. In compliance with the IPM method, the explosion characteristics are corrected by the concentration factor, characterizing the dispersed powder distribution in the reaction vessel. Incomplete disintegration of powder particle aggregates by a mushroom-shaped atomizer and their incomplete combustion (apparatus of the United States Bureau of Mines) led to underestimation of the maximum explosion pressure and overestimation of the lower concentration ignition limit, while the dispersed powder concentration was calculated as the ratio between the dispersed powder weight and vessel volume.

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Authors and Affiliations

  1. Frantsevich Institute for Problems of Materials Science, National Academy of Sciences of Ukraine, Kyiv, Ukraine

    G.I. Vasilieva, V.G. Tokhtuev, O.K. Radchenko & O.D. Neikov

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  1. G.I. Vasilieva
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  2. V.G. Tokhtuev
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  3. O.K. Radchenko
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  4. O.D. Neikov
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Correspondence to O.D. Neikov.

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V.G. Tokhtuev is deceased

Translated from Poroshkova Metallurgiya, Vol. 60, Nos. 11–12 (542), pp. 138–159, 2021.

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Vasilieva, G., Tokhtuev, V., Radchenko, O. et al. Evaluation of the Explosion Hazard of Powders by the Maximum Explosion Pressure and Maximum Rate of Explosion Pressure Rise II. Methods for Testing the Powder Explosion Characteristics. Powder Metall Met Ceram 60, 766–780 (2022). https://doi.org/10.1007/s11106-022-00287-9

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  • DOI: https://doi.org/10.1007/s11106-022-00287-9

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