Loading...

Effects of initial static bed height on fractional conversion and bed pressure drop in tapered-in and tapered-out fluidized bed reactors

Askaripour, H ; Sharif University of Technology | 2016

1351 Viewed
  1. Type of Document: Article
  2. DOI: 10.1016/j.ijmultiphaseflow.2015.08.006
  3. Publisher: Elsevier Ltd , 2016
  4. Abstract:
  5. In this article, a standard 2D Two-Fluid Model (TFM) closed by the kinetic theory of granular flow (KTGF) has been applied to simulate the behavior of tapered-in and tapered-out fluidized bed reactors. In this regard, two types of chemical reactions with gas volume reduction and increase were considered to investigate the effects of initial static bed height on the fractional conversion and bed pressure drop. To validate the CFD model predictions, the results of hydrodynamic simulations concerning bed pressure drop and bed expansion ratio were compared against experimental data reported in the literature and excellent agreement was observed. The obtained simulation results clearly indicate that there is an appropriate static bed height in a tapered-in reactor in which the fractional conversion becomes maximum at this height; whereas variations of static bed height in a tapered-out reactor have insignificant influences on the fractional conversion. Moreover, it was found that the residence time, temperature, and intensity of turbulence of the gas phase are three important factors affecting the fractional conversion in tapered fluidized bed reactors. In addition, it was observed that increasing the static bed height increases the bed pressure drop for both the tapered-in and tapered-out fluidized bed reactors. © 2015 Elsevier Ltd
  6. Keywords:
  7. Bed pressure drop ; Gas volume reduction and increase ; Initial static bed height ; Tapered fluidized beds ; Chemical reactors ; Computational fluid dynamics ; Drops ; Fluid catalytic cracking ; Fluidization ; Fluidized bed furnaces ; Gases ; Pressure drop ; Reduction ; Supersaturation ; Two phase flow ; Fluidized bed reactors ; Fractional conversion ; Gas volume ; Hydrodynamic simulation ; Intensity of turbulences ; Kinetic theory of granular flow ; Static bed height ; Tapered fluidized bed ; Fluidized beds
  8. Source: International Journal of Multiphase Flow ; Volume 79 , 2016 , Pages 50-61 ; 03019322 (ISSN)
  9. URL: http://www.sciencedirect.com/science/article/pii/S0301932215001780