| Zugriffsnummer | 41268 |
| Dokumenttyp | Konferenzartikel |
| Peer Review | unbekannt |
| Sprache | Englisch |
| Titel | Experimental and numerical investigation of the ignition by electrical discharges close to the minimum ignition energy |
| Autor(in); Institution |
Essmann, Stefan; 3.5, Explosionsschutz in der Energietechnik, PTB-Braunschweig
Kummer, Johann-Robert; 3.5, Explosionsschutz in der Energietechnik, PTB-Braunschweig
Markus, Detlev; 3.5, Explosionsschutz in der Energietechnik, PTB-Braunschweig
Maas, Ulrich; Karlsruher Institut für Technologie (KIT), Institut für Technische Thermodynamik, Karlsruhe, GERMANY
|
| Quelle/Jahr | 12th International Symposium on Hazards, Prevention and Mitigation of Industrial Explosions, Proceedings:(2018), 1 - 15 |
| Konferenzangaben | 12th International Symposium on Hazards, Prevention and Mitigation of Industrial Explosions ; 12th ISHPMIE, Kansas City, Mo., 12-17, August, 2018, USA |
| Zusammenfassung | Electrical discharges pose a risk as a possible ignition source in the context of safe operation of electrical equipment in hazardous areas as well as safety-relevant processes in the chemical industry. However, the standards concerning explosion protection are mainly based on empirical data. Therefore, relatively large safety-factors need to be used to ensure safe operation. A more fundamental understanding of the processes governing the ignition by electrical discharges at energies close to the minimum ignition energy (MIE) could help to improve these standards. Consequently, economic benefits for the design and production of explosion protected devices and the safe operation of processes are expected without an increase in accidental risk. Hence, in this study we investigate the ignition process by electrical discharges by means of laser induced fluorescence of OH (OH-LIF). We carried out ignition tests in the most ignitable mixtures of hydrogen, ethene, and propane with air at near MIE conditions. The focus of this work is to describe the processes of flame formation and early flame propagation. When the energy is close to the MIE, the probability of ignition becomes very small. Therefore, even minor changes in the initial conditions may lead to completely different results. To this end, we investigate the effect of the discharge energy on the ignition process. We compare the experimental results to one-dimensional numerical simulations of the ignition process. The numerical model includes detailed chemical kinetics and transport processes. Good agreement between the experiment and the simulations is observed although a one-dimensional model is used. The findings gained through this study can be used to extend and validate numerical models for the prediction of the ignition by electrical discharges in the context of safety-relevant processes and explosion protected devices. |
| Themenbereich der Metrologie | Physikalische Sicherheitstechnik, Explosionsschutz |
| Forschungsprojekt | FOR 1447: Physicochemical-based Models for the Prediction of safety-relevant Ignition Processes |
| Förderinformationen (1) |
Förderername: Deutsche Forschungsgemeinschaft (DFG)
Förderer ID: 0000 0001 2096 9829 Förderer ID Typ: ISNI Förderprogramm: Forschungsgruppe Titel der Förderung: FOR 1447: Physicochemical-based Models for the Prediction of safety-relevant Ignition Processes Förderungsnummer: 163557763 URI der Förderung: http://gepris.dfg.de/gepris/projekt/163557763 |
Zitierung
Essmann, S., Kummer, J.-R., Markus, D., & Maas, U. (2018). Experimental and numerical investigation of the ignition by electrical discharges close to the minimum ignition energy. 12th International Symposium on Hazards, Prevention and Mitigation of Industrial Explosions ; 12th ISHPMIE, Kansas City, Mo., 12-17, August, 2018, USA.