Numerical study of thermal diffusion in a passive autocatalytic recombiner: Possible effects on catalyst temperature and hydrogen distribution

被引：7

作者：

Malakhov, A. A. ^{[1
]}

Avdeenkov, A. V. ^{[1
,2
]}

du Toit, M. H. ^{[3
]}

Duong, Q. H. ^{[4
]}

Bessarabov, D. G. ^{[1
]}

机构：

[1] North West Univ, Fac Engn, DST Hydrogen Infrastruct Ctr Competence HySA Infr, Private Bag X6001, ZA-2520 Potchefstroom, South Africa

[2] All Russian Res Inst Nucl Power Plants Operat VNII, Ferganskaya St 25, Moscow 109507, Russia

[3] North West Univ, Fac Engn, Sch Mech Engn, Private Bag X6001, ZA-2520 Potchefstroom, South Africa

[4] Obninsk Inst Nucl Power Engn NRNU MEPhI, Studgorodok St 1, Obninsk 249040, Russia

来源：

INTERNATIONAL JOURNAL OF HYDROGEN ENERGY | 2023年 / 48卷 / 32期

关键词：

Hydrogen safety; Passive autocatalytic recombiner; Thermal diffusion; CFD simulations; STAR-CCM plus; MODEL; COMBUSTION; MITIGATION; OPERATION; MIXTURES; IGNITION; SAFETY; OXYGEN; OH;

D O I：

10.1016/j.ijhydene.2022.09.136

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

This paper describes a numerical study of the influence of thermal diffusion (the Soret effect) on the operational behaviour of a passive autocatalytic recombiner (PAR). The study pro-poses a detailed three-dimensional computational fluid dynamics (CFD) model of hydrogen oxidation along a cylindrical-type PAR catalyst section (RVK-500, RET, Russia) inside a small-scale vertical channel. The CFD model was developed in STAR-CCM+ and uses multi-step chemical kinetics with a conjugated approach (surface and gas-phase included). The cata-lyst temperature and hydrogen conversion with and without the Soret effect in the model were determined numerically and compared against experimental measurements. The ex-periments reported here have previously been conducted on the cylindrical-type catalyst section, for 5-7 vol % inlet H2 concentration. Numerical simulations demonstrate that local hydrogen concentration can be increased due to thermal diffusion at the lower side of the stainless-steel frame. Results identified that the catalyst temperature can be underpredicted by 10-20 degrees C without thermal diffusion included in the model.(c) 2022 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.

引用

页码：12129 / 12138

页数：10

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