| Zugriffsnummer | 53038 |
| Dokumenttyp | Konferenzartikel |
| Peer Review | unbekannt |
| Sprache | Englisch |
| Titel | Investigations on different distribution systems for dusts inside the 20L-sphere |
| Autor(in); Institution |
Rodríguez, Manuel Velasco; University of Oviedo, Gijón, SPAIN
Schmidt, Martin; Bundesanstalt fuer Materialforschung und- prüfung (BAM), Berlin, GERMANY
|
| Quelle/Jahr | Proceedings of the 15th International Symposium on Hazards, Prevention and Mitigation of Industrial Explosions:(2024), 452 - 464 |
| DOI | |
| Konferenzangaben | 15th International Symposium on Hazards, Prevention and Mitigation of Industrial Explosions, ISHPMIE 2024, Naples, 10-14, June, 2024, Italy |
| Freie Schlagworte | Safety characteristics ; Turbulence ; Dust Explosions ; Nozzles ; Distribution |
| Zusammenfassung | The determination of several safety characteristics for dusts requires the resuspension in air. This is normally conducted using two vessels, one with an overpressure holding the dust and dispersing it into the second one, where the explosion takes place, through a nozzle. This procedure has the disadvantage, that some dusts cannot be conveyed through the nozzle properly. Another disadvantage is, that the pressure balancing between the two vessels depends on the dust loading and especially for heavy dusts and high loadings the initial pressure inside the explosion vessel might be reduced. One very recent example testing nitrocellulose raised the question, whether some dusts pose a risk being distributed and pressed through a nozzle for the testing device and, in worst case, for the operator. Many researchers developed alternative types of nozzles but most of the publications were designed for one type of dust and in none the CAD-files are provided for reproducing the nozzle. This article investigates four types of nozzles, the two standard ones that are widely used already, a novel type, that got introduced into the international standard in 2016 but is still seldomly used and one that was constructed to overcome some of the observed disadvantages. The injection curves are compared with and without dust loadings as well as the explosion characteristics. Probably due to smaller free cross-section of mushroom-cup and mushroom nozzles, duration of the dispersion is longer. The other dispersion characteristics are similar. The explosion overpressure was almost unaffected by a change of the nozzle. Minor differences in the rate of pressure rise (dp/dt) and the corresponding KSt values were observed but these were below the usual scattering of dust explosions. Eventually, a suggestion is given for different types of dusts. |
| Relation | |
| Kostenfreier Zugang | Open Access Gold |
| Rechteinformation | CC BY-ND 4.0 ; Creative Commons Attribution NoDerivatives 4.0 License |
| Themenbereich der Metrologie | Physikalische Sicherheitstechnik, Explosionsschutz |
| Innovationscluster | Systemische Metrologie ; Umwelt und Klima |
Zitierung
Bretislav, J., Pandal, A., Rodríguez, M. V., Schmidt, M., Enrico, D., Dufaud, O., & Spitzer, S. (2024). Investigations on different distribution systems for dusts inside the 20L-sphere. 15th International Symposium on Hazards, Prevention and Mitigation of Industrial Explosions, ISHPMIE 2024, Naples, 10-14, June, 2024, Italy. https://doi.org/10.5281/zenodo.12621001