| Zugriffsnummer | 44535 |
| Dokumenttyp | Konferenzartikel |
| Peer Review | unbekannt |
| Sprache | Englisch |
| Titel | Charge-separating processes by spraying water under high pressure |
| Autor(in); Institution |
Baumann, Florian; 3.7, Grundlagen des Explosionsschutzes, PTB-Braunschweig
Himstedt, Matthias; 3.7, Grundlagen des Explosionsschutzes, PTB-Braunschweig
Möckel, Dieter; 3.7, Grundlagen des Explosionsschutzes, PTB-Braunschweig
Thedens, Martin; 3.7, Grundlagen des Explosionsschutzes, PTB-Braunschweig
|
| Quelle/Jahr | 13th International Symposium on Hazards, Prevention and Mitigation of Industrial Explosions (ISHPMIE):(2020), 550 - 561 |
| 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 | electrostatic ; high pressure ; water jet ; field meter |
| Zusammenfassung | Spraying water under high pressure generates charge-separating processes. While cleaning tanks and vessels in which an explosive atmosphere is present, an explosion may occur in the event of a resulting discharge. Water forms electrical double layers at the phase boundaries. Mechanical separation processes dissolve the water into many drops. This leads to charge separation and the charging of the sprayed water. The mechanical separation processes include water exiting from the nozzle, hydrodynamic instability in the jet and impact with an obstacle. Given that water has many charge carriers, the charge is stronger than with solvents. Whether the charges and the resulting discharges are potentially capable of igniting an explosive atmosphere must be investigated. The aim of this research is to define the quantity and polarity of the electrostatic charges of sprayed water under high pressure. Different measurement techniques and methods are used to enable mutual validation and to generate verified measurement results of the electric field and the potential. Water of different electrical conductivity is sprayed in free space and into a grounded conductive 1 m3 vessel. Design changes to the vessel allow centric or oblique spraying. The result is intended to extend the scope of application of TRGS 727, which refers to ignition hazards due to electrostatic charging. This project is funded by the DGUV (German Social Accident Insurance) and partners from industry. |
| Kostenfreier Zugang | Freier Zugang |
| Rechteinformation | CC BY-ND 4.0 ; Creative Commons Attribution NoDerivatives 4.0 License |
| Themenbereich der Metrologie | Physikalische Sicherheitstechnik, Explosionsschutz |
Zitierung
Baumann, F., Himstedt, M., Möckel, D., & Thedens, M. (2020). Charge-separating processes by spraying water under high pressure. 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