Filtern
Erscheinungsjahr
Dokumenttyp
- Vortrag (22)
- Beitrag zu einem Sammelband (11)
- Zeitschriftenartikel (7)
- Beitrag zu einem Tagungsband (1)
Sprache
- Deutsch (33)
- Englisch (7)
- Italienisch (1)
Schlagworte
- Sterilisation (3)
- Explosionsgrenzen (2)
- Explosionsschutz (2)
- Free convection (2)
- Gas reaction (2)
- Inertisierung (2)
- QRA (2)
- Quantitative Risikoanalyse (2)
- Reactive flow (2)
- Störfall-Verordnung (2)
Eingeladener Vortrag
- nein (22)
Instationäre Berechnung der Lachenverdunstung und -verdampfung mittels eines Grenzschichtverfahrens
(2008)
Chemically unstable gases - flammability of ethylene oxide mixtures in sterilization processes
(2008)
For the assessment of explosion hazards by industrial
sterilization processes with ethylene oxide (EO), the flammability
regions of 3-component systems EO/nitrogen/air, EO/carbon
dioxide/air and EO/water vapor/air were determined. The tests were
performed at temperatures of 20 °C and 100 °C and at pressures of
40 kPa and 100 kPa in accordance with the standard test method EN
1839-B.
The observed flammability regions are similar in shape and
typical for mixtures with ethylene oxide. According to the molecular
heat capacities the regions get larger with nitrogen and smaller with
carbon dioxide. They become larger with increasing pressure and
increasing temperature.
Using experimental data a semi-empirical model was created
that allows the calculation of flammability limits of process gases in
sterilization processes. Such process gases can consist of EO,
nitrogen, carbon dioxide, water vapor and air.
The model is based on the assumption that the adiabatic flame
temperatures along the boundary curves of a flammability region
have a certain temperature profile that is nearly independent of the
type of the inert gas. The adiabatic flame temperatures were
calculated by using the Gaseq Code.
Using a temperature profile calculated from only one
experimental system EO/inert gas/air it is possible to predict the
flammability limits of systems with other inert gases or of process
gases containing several inert gases.