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CFD model of fluid flow and particle deposition during cryogenic condensation

Lookup NU author(s): Dr James Hendry, Dr Jonathan Lee

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This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License (CC BY-NC-ND).


Abstract

© 2019 Institution of Chemical Engineers Cryogenic condensation is an attractive option for controlling VOC emissions. Cryogenic condensation can offer lower operational costs than conventional abatement technologies like thermal oxidation and adsorption. At the low temperatures (ca. −100 °C) used in cryogenic condensation, many high melting point VOCs will freeze or desublimate. A fine particulate solid could form under the temperature gradients inside the condenser, becoming entrained in the gas phase on exit. This paper reports results in modelling the process using CFD. In this paper we present an inert DPM model in 3D and a dynamic DPM model in 2D to investigate this problem through CFD. The 3D results demonstrate particles must grow beyond a certain size to prevent entrainment in the outlet gas flow. These sizes are: 12 μm at 150 Nm³/h (Stk99% = 0.18 at Redh = 4600); 16 μm at 100 Nm³/h (Stk99% = 0.22 at Redh = 3000); 23 μm at 50 Nm³/h (Stk99% = 0.23 at Redh = 1500). The 2D results demonstrate a DPM model (Eulerian–Lagrangian model) of nucleation and growth of particles during cryogenic condensation.


Publication metadata

Author(s): Hendry JR, Lee JGM, Battrum MJ

Publication type: Article

Publication status: Published

Journal: Chemical Engineering Research and Design

Year: 2019

Volume: 143

Pages: 201-214

Print publication date: 01/03/2019

Online publication date: 22/01/2019

Acceptance date: 14/01/2019

Date deposited: 28/03/2019

ISSN (print): 0263-8762

ISSN (electronic): 1744-3563

Publisher: Elsevier Ltd

URL: https://doi.org/10.1016/j.cherd.2019.01.016

DOI: 10.1016/j.cherd.2019.01.016


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