Experimental study on the influence of the nitrogen concentration in the air on the minimum ignition energies of combustible powders due to electrostatic discharges |
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| Institution: | 1. Japan National Institute of Occupational Safety and Health, 1-4-6 Umezono, Kiyose, Tokyo 204-0024, Japan;2. Konkuk University, 120 Neungdong-ro, Gwangin-gu, Seoul 143-701, Republic of Korea;3. Technology Institution of Industrial Safety, 2-16-26 Hirosedai, Sayama-shi, Saitama 350-1328, Japan;1. Institute for Occupational Safety and Health of the German Social Accident Insurance (IFA), Alte Heerstrasse 111, 53757 Sankt Augustin, Germany;2. University of Wuppertal, Gausstrasse 20, 42119 Wuppertal, Germany;1. Politecnico di Milano, Dipartimento di Chimica, Materiali e Ingegneria Chimica, “G. Natta”, via Mancinelli 7, 20131, Milano, Italy;2. Fike Corporation, 704 SW 10th Street, Blue Springs, MO, United States;3. Università degli Studi dell’Insubria, Dipartimento di Scienza e Alta Tecnologia, via G.B. Vico 46, 21100, Varese, Italy |
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| Abstract: | As a useful method of preventing dust explosions, nitrogen (N2), an incombustible gas, has been applied to an explosive atmosphere. This paper is a report that quantitatively determines whether the minimum ignition energy of powder depends on the nitrogen (or oxygen) concentration in the air. Hartman vertical-tube apparatus and six sample powders were used in this study. The results show that the minimum ignition energies of all of the powders used in this study increased with increased amounts of N2 in the air. However, the effects were different in all of the sample powders. We finally suggest that the N2 concentration of 84% (or above) prevents dust explosions due to electrostatic discharges in the industrial process with the sample powders used in this experiment. |
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| Keywords: | Electrostatic discharges Minimum ignition energy Inerting Nitrogen Dust explosions |
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