| Zugriffsnummer | 40959 |
| Dokumenttyp | Konferenzartikel |
| Peer Review | unbekannt |
| Sprache | Englisch |
| Titel | Lower explosion point under non-atmospheric conditions |
| Autor(in); Institution |
Lucassen, Arnas; 3.7, Grundlagen des Explosionsschutzes, PTB-Braunschweig
Beyer, Michael; 3.7, Grundlagen des Explosionsschutzes, PTB-Braunschweig
Zakel, Sabine; 3.7, Grundlagen des Explosionsschutzes, PTB-Braunschweig
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| Quelle/Jahr | 12th International Symposium on Hazards, Prevention and Mitigation of Industrial Explosions:(2018), 8 S. |
| Availability | [USB-Stick] |
| Konferenzangaben | 12th International Symposium on Hazards, Prevention and Mitigation of Industrial Explosions ; ISHPMIE, Kansas, Mo., 12-17, August, 2018, USA |
| Freie Schlagworte | lower explosion point ; LEP ; pressure dependence ; vapor pressure ; explosion limit |
| Zusammenfassung | The lower explosion point (LEP) is defined as the temperature of a combustible liquid at which the concentration of the saturated vapour equals the lower explosion limit. It is an important safety characteristic parameter in explosion protection. There is an European standard (EN 15794) for the determination of explosion points (lower and upper) as well as a repository of tabulated data. However, modern industrial processes often use non-atmospheric conditions to enhance the yields. For instance, for partial oxidation of alcohols to aldehydes or carboxylic acids higher pressures or pure oxygen are used. Our work aims to expand the standardised determination method for higher pressures and non-air oxidizers. A theoretical method using the vapor pressure and temperature dependence of the lower explosion limit can be employed to estimate pressure dependence of the LEP, but in many cases, there is a lack of reliable input or LEP validation data. Therefore, an apparatus to measure the LEP at pressures from a 100 mbar up to 6 bars was constructed. Traceability to the reference value given in the standard was reached within the measurement uncertainty. Very good accordance was also achieved for the pure reference substance between the values measured at non-atmospheric pressures and the calculation method. As in real industrial processes more complex mixtures containing solvents or process water might occur, further pre-normative research will be performed on mixtures and other oxidizers than air, to ensure safe operation. |
| Themenbereich der Metrologie | Physikalische Sicherheitstechnik, Explosionsschutz |