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Theoretical Explanation of Pressure and Holdup Overshoots in Countercurrent Packed Columns
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SYSNO ASEP 0105055 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Ostatní články Title Theoretical Explanation of Pressure and Holdup Overshoots in Countercurrent Packed Columns Title Teoretické vysvětlení překmitu tlaku a zádrže v protiproufdé náplňové koloně Author(s) Svoboda, Petr (UCHP-M)
Staněk, Vladimír (UCHP-M) RIDSource Title Industrial and Engineering Chemistry Research. - : American Chemical Society - ISSN 0888-5885
Roč. 43, č. 26 (2004), s. 8317-8322Number of pages 6 s. Language eng - English Country US - United States Keywords counter-current packed bed ; overshoot ; mathematical model Subject RIV CI - Industrial Chemistry, Chemical Engineering R&D Projects GA104/03/1558 GA ČR - Czech Science Foundation (CSF) CEZ AV0Z4072921 - UCHP-M Annotation This paper presents a mathematical model of the transient behavior of the hydrodynamics of a countercurrent packed bed column. The model has been solved numerically for the conditions representing a step increase of either gas or liquid inlet velocity. The obtained profiles exhibit overshoots of pressure drop and liquid holdup for conditions when the step change brings the system into the region where liquid holdup is a strong function of also gas velocity. This fully confirms our previous experimental observation. Our results show that the overshoots appear due to the formation of new liquid holdup profile that temporarily lowers liquid velocity in the lower parts of the bed while it temporarily increases the gas velocity in the upper parts of the bed. Reasonable agreement was found between the predicted and experimental transient profiles of pressure drop and liquid holdup exhibiting overshoots. Workplace Institute of Chemical Process Fundamentals Contact Eva Jirsová, jirsova@icpf.cas.cz, Tel.: 220 390 227 Year of Publishing 2005
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