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Frontiers of Chemical Science and Engineering

ISSN 2095-0179

ISSN 2095-0187(Online)

CN 11-5981/TQ

Postal Subscription Code 80-969

2018 Impact Factor: 2.809

Front. Chem. Sci. Eng.    2014, Vol. 8 Issue (2) : 141-148    https://doi.org/10.1007/s11705-014-1423-0
RESEARCH ARTICLE
Fundamental influences of particles on stirred and unstirred venting processes of foaming systems
Henrik LEIMEISTER(),Jörg STEINBACH()
Department of Process Engineering, Technische Universität Berlin, Straße des 17. Juni 135, 10623 Berlin, Germany
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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     
Corresponding Author(s): Henrik LEIMEISTER   
Issue Date: 22 May 2014
 Cite this article:   
Henrik LEIMEISTER,Jörg STEINBACH. Fundamental influences of particles on stirred and unstirred venting processes of foaming systems[J]. Front. Chem. Sci. Eng., 2014, 8(2): 141-148.
 URL:  
https://academic.hep.com.cn/fcse/EN/10.1007/s11705-014-1423-0
https://academic.hep.com.cn/fcse/EN/Y2014/V8/I2/141
Fig.1  Schematic setup of the ADCII. (1) Safety enclosure, (2) oven, (3) Reactor (1.2 L), (4) motorized stirrer, (5) heater, (6) heater coil, (7) temperature transducer, (8) pressure transducer, (9) temperature transducer, (10) pressure transducer, (11) pneumatic driven ball valve, (12) orifice (2 mm), (13) safety valve, (14) vent line, (15) 120 L-catch tank
Fig.2  Pressure over time for systems containing 0.005g/L SDS with addition of various particles
Fig.3  Relative mass discharge of solids and fluids for systems containing SDS with addition of various particles
Fig.4  Pressure over time for systems containing 5 vol.% 2-methyl-1-propanol with addition of various particles
Fig.5  Relative mass discharge of solids and fluids for systems containing 2-methyl-1-propanol with addition of various particles
Fig.6  Pressure over time for systems stirred at 400 rpm containing 0.005g/L SDS with addition of various particles
SystemTwo-phaseSilica beads Type S 0-50µmSilica beads Type S 40-70µmSilica beads Type S 90-150µm3MTMglass beads K1
Liquid discharge /%-21.3752.1735.1630.1163.82
400 rpm41.0679.6971.9145.1168.32
Solid discharge/%--4.311.030.5682.47
400 rpm-4.421.801.6980.41
Tab.1  Mass discharge of stirred and unstirred systems containing 0.005g/L SDS with addition of various particles
Fig.7  Model of the different layers of effect for particles for the venting of foaming systems
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