Runaway reaction Validating a less overestimating vent sizing method

Luc Vechot, Jean Pierre Bigot, Marc Kazmierczak, Patricia Vicot

Research output: Chapter in Book/Report/Conference proceedingConference contribution

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.

Original languageEnglish
Title of host publication05AIChE: 2005 AIChE Annual Meeting and Fall Showcase, Conference Proceedings
Pages7708-7713
Number of pages6
Publication statusPublished - 2005
Externally publishedYes
Event05AIChE: 2005 AIChE Annual Meeting and Fall Showcase - Cincinnati, OH, United States
Duration: 30 Oct 20054 Nov 2005

Other

Other05AIChE: 2005 AIChE Annual Meeting and Fall Showcase
CountryUnited States
CityCincinnati, OH
Period30/10/054/11/05

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Keywords

  • Gas venting flow
  • Gassy reaction
  • Runaway reaction
  • Vent sizing method

ASJC Scopus subject areas

  • Engineering(all)

Cite this

Vechot, L., Bigot, J. P., Kazmierczak, M., & Vicot, P. (2005). Runaway reaction Validating a less overestimating vent sizing method. In 05AIChE: 2005 AIChE Annual Meeting and Fall Showcase, Conference Proceedings (pp. 7708-7713)