Runaway reaction Validating a less overestimating vent sizing method Conference Paper uri icon

abstract

  • Simplifying assumptions used in DIERS classical vent sizing methods for gassy systems (mainly conservation of the initial reactive mass and homogeneous vessel venting) can lead to unrealistically large vent areas. H. Fauske (2000) proposed to use the same vent area as for pure gas flow venting. It thus leads to a much smaller vent area. This paper deals about our understanding of Fauske's method bases by introducing the "balance idea": when changing from one phase to two-phase venting, decrease of mass inventory in the reactor could balance venting velocity decrease. Theoretical testing of this idea allowed us to identify types of systems for which this approach could potentially be not conservative. One is when the reaction kinetics are already rapid at vent opening and there is therefore not much time for mass to vent before turn-around. Another is when high quality vent flow occurs (gas with small fraction of liquid) so that vented mass is relatively small, vent flow velocity at vent being however severely decreased compared to pure gas velocity.

published proceedings

  • AIChE Annual Meeting, Conference Proceedings

author list (cited authors)

  • Vechot, L., Bigot, J. P., Kazmierczak, M., & Vicot, P.

complete list of authors

  • Vechot, L||Bigot, JP||Kazmierczak, M||Vicot, P

publication date

  • December 2005