TY - JOUR A1 - Balcazar Pust, Emilio A1 - Neher, F. A1 - Liebner, Christian A1 - Hieronymus, Hartmut A1 - Klemm, E. T1 - Determination of ignition temperature in micro reactors JF - Chemical engineering transactions N2 - Explosion protection of oxidation reactions in micro reactors was investigated. Lange et al. (2014) reported on the possibilities of operating oxidation reactions in catalyst coated micro reactors within the explosion regime, but also warned about hotspot induced thermal runaway and detonation ignition at certain conditions. Methane and ethene, representing the explosion groups IIA1 and IIB (DIN EN ISO 16852), were used in stoichiometric oxygen mixtures with respect to total oxidation, which represents the worst case scenario in terms of safety assessment. Using laser radiation on a ceramic target inside of the micro channel, an artificial, controllable hotspot was generated. The ignition temperatures of fuel gas/oxygen mixtures inside a micro reactor were measured and their dependencies on initial pressure, initial temperature, volumetric flow rate, and micro channel height were examined. Deflagration reactions prior to the detonation were observed for the first time inside a micro reactor. KW - Explosion safety KW - Explosionsschutz KW - Zündtemperatur KW - Mikroverfahrenstechnik KW - Thermisches Durchgehen KW - Micro process engineering KW - Autoignition temperature KW - Hotspot KW - Thermal Runaway PY - 2016 DO - https://doi.org/10.3303/CET1648092 SN - 2283-9216 SN - 1974-9791 VL - 48 SP - 547 EP - 552 PB - AIDIC CY - Milano AN - OPUS4-34164 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Schröder, Volkmar A1 - Holtappels, Kai T1 - Zündung von Acetylen durch Druckstoß in Rohrleitungen JF - Chemie - Ingenieur - Technik N2 - In der Prozesstechnik kommt es immer wieder zu Zündungen durch Druckstöße mit Gasen. Bekannt ist dieses Phänomen vom Umgang mit Sauerstoff im Kontakt mit nicht geeigneten Materialien. Aber auch andere Gase, z. B. Acetylen, können durch schnelle Kompression gezündet werden. In der vorliegenden Arbeit werden, in Fortführung früherer Untersuchungen in Rohren, solche Zündvorgänge mit Hilfe von Zündtemperaturen abgeschätzt. KW - Acetylen KW - Adiabatsiche Verdichtung KW - Druckstoß KW - Explosion KW - Zündtemperatur KW - Explosionsschutz PY - 2009 DO - https://doi.org/10.1002/cite.200800147 SN - 0009-286X SN - 1522-2640 VL - 81 IS - 1-2 SP - 177 EP - 181 PB - Wiley-VCH Verl. CY - Weinheim AN - OPUS4-19045 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER -