| Zugriffsnummer | 44537 |
| Dokumenttyp | Konferenzartikel |
| Peer Review | unbekannt |
| Sprache | Englisch |
| Titel | Prenormative study on the safety characteristics of explosion protection for hybrid mixtures of dusts and vapours |
| Autor(in); Institution |
Heilmann, Vanessa; 3.7, Grundlagen des Explosionsschutzes, PTB-Braunschweig
Adeyemi, Taiwo; 3.7, Grundlagen des Explosionsschutzes, PTB-Braunschweig
Hirsch, Werner; 3.7, Grundlagen des Explosionsschutzes, PTB-Braunschweig
Großhans, Holger; 3.5, Explosionsschutz in der Energietechnik, PTB-Braunschweig
Zakel, Sabine; 3.7, Grundlagen des Explosionsschutzes, PTB-Braunschweig
Krause, Ulrich; Otto-von-Guericke Universität (OVGU), Magdeburg, GERMANY
|
| Quelle/Jahr | 13th International Symposium on Hazards, Prevention and Mitigation of Industrial Explosions (ISHPMIE):(2020), 677 - 687 |
| Herausgeber(in) |
Physikalisch-Technische Bundesanstalt
|
| DOI | |
| Konferenzangaben | 13th International Symposium on Hazards, Prevention and Mitigation of Industrial Explosions ; ISHPMIE, Virtual Conference, 27-31, July, 2020 |
| Freie Schlagworte | hybrid mixtures ; explosions ; safety characteristics ; standardization |
| Zusammenfassung | The present work is part of a joint project, initiated to develop standardized methods to evaluate the safety characteristics of flammable hybrid mixtures. It focuses on the dust/vapour/air systems. The safety characteristics to be measured comprise the maximum explosion pressure (pmax), the maximum rate of pressure rise (dp/dt)max and the lower explosion limit (LEL). From previous investigations on dust/gas/air mixtures it is known, that these values cannot be evaluated by a simple linear combination of the respective values of the pure substances. In some cases, this would lead to an underestimation of the explosion risk and severity. The standard 20L-sphere for dusts was used for the experiments. Some modifications of the set-up were required to allow experiments with dust/vapour/air mixtures. Verification of the modified apparatus was done for dust and vapour separately in order to ensure accuracy of the results even for the individual components. The different testing procedures used for gases or vapours on the one hand and dust on the other hand are quite different. While vapour characteristics are measured in a quiescent atmosphere with moderate-energy electrical sparks, turbulence and high-energy chemical igniters are intended to determine these values for dust. Prior to performing the hybrid mixture tests, the quantitative change in the safety characteristics for turbulent vapour/air mixtures was investigated as well as the influence of the ignition source and energy. The concentration related pex, (dp/dt)ex, and LEL were quantified for 2-propanol under different states of turbulence. Additionally, the process of mixture formation is studied in a numerical simulation and first results presented. These investigations serve as the starting point for measurement series on the safety characteristics of hybrid dust/vapour/air systems. |
| Kostenfreier Zugang | Freier Zugang |
| Rechteinformation | CC BY-ND 4.0 ; Creative Commons Attribution NoDerivatives 4.0 License |
| Themenbereich der Metrologie | Physikalische Sicherheitstechnik, Explosionsschutz |
Zitierung
Heilmann, V., Adeyemi, T., Hirsch, W., Großhans, H., Zakel, S., & Krause, U. (2020). Prenormative study on the safety characteristics of explosion protection for hybrid mixtures of dusts and vapours. 13th International Symposium on Hazards, Prevention and Mitigation of Industrial Explosions ; ISHPMIE, Virtual Conference, 27-31, July, 2020. https://doi.org/10.7795/810.20200724