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Heat and mass transport in a nonlinear fixed-bed catalytic reactor: Hot spots and thermal runaway

Henda, Redhouane; Machac, Alan and Nilsson, Bernt LU (2008) In Chemical Engineering Journal 143(1-3). p.195-200
Abstract
Transient heat and mass transport in a wall-cooled tubular catalytic bed reactor is numerically investigated. A two-dimensional pseudo-heterogeneous model, accounting for transport in the solid and fluid phases, with axial and radial dispersions is used to describe transport in the reactor. The effects of inlet process conditions, viz., temperature and concentration, are investigated and their impact on the development of thermal runaway and hot spots in the reactor is analyzed. Under typical process conditions the calculation results show the development of a hot spot downstream the reactor inlet. At reduced feed temperature thermal runaway develops for an inlet concentration of 0.505 mol/m(3). A criterion for thermal runaway limit has... (More)
Transient heat and mass transport in a wall-cooled tubular catalytic bed reactor is numerically investigated. A two-dimensional pseudo-heterogeneous model, accounting for transport in the solid and fluid phases, with axial and radial dispersions is used to describe transport in the reactor. The effects of inlet process conditions, viz., temperature and concentration, are investigated and their impact on the development of thermal runaway and hot spots in the reactor is analyzed. Under typical process conditions the calculation results show the development of a hot spot downstream the reactor inlet. At reduced feed temperature thermal runaway develops for an inlet concentration of 0.505 mol/m(3). A criterion for thermal runaway limit has been developed whereby runaway can be detected at a point in time during the process when the time derivative of temperature increases monotonously with time throughout the bed. Under low feed concentration and temperature a simpler pseudo-homogeneous model can be used to describe the reactor. Crown Copyright (C) 2008 Published by Elsevier B.V. All rights reserved. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
transient behavior, heat and mass transport, exothermic reaction
in
Chemical Engineering Journal
volume
143
issue
1-3
pages
195 - 200
publisher
Elsevier
external identifiers
  • wos:000259850800021
  • scopus:50649084317
ISSN
1385-8947
DOI
10.1016/j.cej.2008.04.015
language
English
LU publication?
yes
id
38338cfd-329d-4b15-9c62-6aebf55927f8 (old id 1285850)
date added to LUP
2009-02-06 09:02:09
date last changed
2017-01-01 06:03:58
@article{38338cfd-329d-4b15-9c62-6aebf55927f8,
  abstract     = {Transient heat and mass transport in a wall-cooled tubular catalytic bed reactor is numerically investigated. A two-dimensional pseudo-heterogeneous model, accounting for transport in the solid and fluid phases, with axial and radial dispersions is used to describe transport in the reactor. The effects of inlet process conditions, viz., temperature and concentration, are investigated and their impact on the development of thermal runaway and hot spots in the reactor is analyzed. Under typical process conditions the calculation results show the development of a hot spot downstream the reactor inlet. At reduced feed temperature thermal runaway develops for an inlet concentration of 0.505 mol/m(3). A criterion for thermal runaway limit has been developed whereby runaway can be detected at a point in time during the process when the time derivative of temperature increases monotonously with time throughout the bed. Under low feed concentration and temperature a simpler pseudo-homogeneous model can be used to describe the reactor. Crown Copyright (C) 2008 Published by Elsevier B.V. All rights reserved.},
  author       = {Henda, Redhouane and Machac, Alan and Nilsson, Bernt},
  issn         = {1385-8947},
  keyword      = {transient behavior,heat and mass transport,exothermic reaction},
  language     = {eng},
  number       = {1-3},
  pages        = {195--200},
  publisher    = {Elsevier},
  series       = {Chemical Engineering Journal},
  title        = {Heat and mass transport in a nonlinear fixed-bed catalytic reactor: Hot spots and thermal runaway},
  url          = {http://dx.doi.org/10.1016/j.cej.2008.04.015},
  volume       = {143},
  year         = {2008},
}