Fundamental influences of particles on stirred and unstirred venting processes of foaming systems

Abstract

Venting is the common safety measure to protect plant equipment against excessive overpressure. So far, scenarios in which particles were part of the system and should have been accounted for did ignore their presence; the scenarios were treated like a two-phase system. Current research shows that particles can have a major influence on the venting behaviour. Experimental results indicate that particles affect level swell and relief flow especially of foamy systems. Based on those results four different layers of influence of the particle have been identified and are presented in a first model. Based on this model recommendations for the development of new and more complex models are given.

Keywords

venting / multi-phase

References

[1] DIERS. Technology Summary: Emergency Relief Systems for Runaway Chemical Reactions and Storage Vessels – A Summary of Multiphase Flow Methods. New York: American Institution on Chemical Engineering, 1986

[2] SchmidtJ. Sizing of nozzles, venturis, orifices, control and safety valves for initially sub-cooled gas/liquid two-phase flow –The HNE-DS method. Forschung im Ingenieurwesen, 2007, 71(1): 47-58

[3] DuhY S, HuK H, ChangJ C, KaoC S. Visualization of emergency viscous two-phase venting behaviours. Journal of Loss Prevention in the Process Industries, 2009, 22(2): 145-152

[4] SuceT, ButlerC, HareJ, KerrD, RoyleM, WildayJ. Venting studies of the hydrolisis of acetic anhydride with and without surfactant. Unpublished report. United Kingdom: Health and Safety Executive, 1999

[5] PoliM, ImhofH, HolstN, SteinbachJ. Venting of foaming three-phase systems. Chemical Engineering & Technology, 2008, 32(2): 312-318

[6] HELL. Research Report 085: Reactor Pressure Relief of Fluids Containing Suspended Solids. Norwich: Health and Safety Executive, 2003

[7] WaldramS, McIntoshR, EtchellsJ. Reactor pressure relief of fluids containing suspended solids. Process Safety Progress, 2006, 25(3): 214-226

[8] ChenJ, LeeC, ChengC, ChouW, HoT. Pilot-scale study of multi-phase venting from a vessel at elevated pressure and temperature. Process Safety and Environmental Protection, 2000, 78(6): 434-444

[9] PoliM, SteinbachJ. Influence of bubble nucleation on the pressure relief of non-reactive three-phase systems. Inzynieria Chemiczna I Procesowa, 2007, 28: 139-147

[10] LeimeisterH, SteinbachJ. The influence of hydrophilic properties on the venting of foamy three phase systems. Process Safety Progress, 2013, 32(3): 239-243

[11] LeimeisterH, SteinbachJ. Influences of silica beads on the venting of weakly and strongly foaming systems. Advanced Chemical Engineering Research, 2014, (in press)

[12] MataC, JosephD. Foam control using a fluidized bed of hydrophobic particles. International Journal of Multiphase Flow, 1999, 25(1): 63-85

[13] GuitiánJ, JosephD. How bubbly mixtures foam and foam control using a fluidized bed. International Journal of Multiphase Flow, 1998, 24(1): 1-16

[14] TummalaN, ArgyrisD, StrioloA. A molecular dynamics study of sodium dodecyl sulfate (SDS) at the silica-water interface: pH effect. AIChE 100: Annual Meeting-Proceedings. Philadelphia, USA: AIChE, 2008

[15] JasoS. Modeling and design of the fluidized bed reactor for the oxidative coupling of methane. Dissertation for the Doctoral Degree. Berlin: Technische Universität, 2012

[16] ScheckerJ, FriedelL. Submodel for level swell with superimposed foaming in case of reactor depressurisation. Forschungim Ingenieurwesen, 2004, 69(1): 44-56

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