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CFD Study of an Evaporative Trickle Bed Reactor

[+] Author Affiliations
Wayne Strasser

Eastman Chemical Company, Kingsport, TN

Kurt Svihla

ANSYS, Inc., Canonsburg, PA

Paper No. IMECE2009-13303, pp. 259-268; 10 pages
doi:10.1115/IMECE2009-13303
From:
  • ASME 2009 International Mechanical Engineering Congress and Exposition
  • Volume 9: Heat Transfer, Fluid Flows, and Thermal Systems, Parts A, B and C
  • Lake Buena Vista, Florida, USA, November 13–19, 2009
  • Conference Sponsors: ASME
  • ISBN: 978-0-7918-4382-6 | eISBN: 978-0-7918-3863-1
  • Copyright © 2009 by ASME

abstract

A numerical study was carried out to investigate steady-state and transient phase distribution, evaporation, and thermal runaway in a large-scale high-pressure trickle bed reactor operating in the low interaction regime. The thermal inertia of the catalyst particles proved to be a significant contribution to the overall energy balance. A cooling recycle stream, containing reaction products and a fresh feed, was included via a closed loop calculation. It was found that, as expected, phase distribution in the catalyst bed had a substantial impact production rate; a faulty feed distribution system can cost approximately 20% in overall steady-state product conversion. Grid resolution effects were quantified and were found to have minimal impact on macroscopic measures. Also, most results were insensitive to the extent of the modeled domain and the commercial solver version. In the event that the cooling recycle stream is lost, the external reactor shell temperature can exceed its design intent. It was found that reducing the quantity of fresh reactant feed in this situation can dramatically reduce the potential for vessel damage.

Copyright © 2009 by ASME

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