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Wrong‐way behavior of packed‐bed reactors: II. Impact of thermal dispersion
Author(s) -
Pinjala V.,
Chen Y. C.,
Luss D.
Publication year - 1988
Publication title -
aiche journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.958
H-Index - 167
eISSN - 1547-5905
pISSN - 0001-1541
DOI - 10.1002/aic.690341010
Subject(s) - excursion , transient (computer programming) , mechanics , dispersion (optics) , steady state (chemistry) , thermal , transient response , thermodynamics , materials science , chemistry , physics , engineering , optics , electrical engineering , law , political science , computer science , operating system
A sudden reduction in the feed temperature of a packed‐bed reactor may lead to a transient temperature rise, referred to as a wrong‐way behavior. As expected, the axial dispersion of heat decreases the magnitude of the temperature excursion and prolongs the transient shift to a new steady state. In addition, the thermal dispersion may enable the wrong‐way behavior to ignite a low‐temperature steady state leading to a disastrous runaway of the reactor. Moreover, it may create a transient high‐temperature wave, which moves initially in the upstream direction. The axial dispersion of heat can lead to some behavioral features which are qualitatively different from those of a model which ignores it. The transient temperature excursion does not exceed a value, which can be estimated by a simple analytical expression.