Effect of the tube shape on gas and particle flow in spouted beds with a porous draft tube

Flow characteristics of a spouted bed with a porous draft tube have been investigated experimentally. In this study, both a cylindrical tube and a conical-cylindrical tube were used as the draft tube. As a result, the efficiency of gas-solid contact and solids circulation rate in the bed were considerably improved by inserting a conical-cylindrical porous draft tube into the bed. Moreover, it was confirmed that the gas flow rate through the annulus reached nearly the level of a conventional spouted bed by using conical-cylindrical porous draft tube.

[1]  F. Berruti,et al.  Solids circulation in a spout‐fluid bed with draft tibe , 1988 .

[2]  A. Fane,et al.  Gas distribution and heat transfer in a draft-tube spouted bed , 1984 .

[3]  John R. Grace,et al.  Spouting of Particulate Solids , 1997 .

[4]  T. Nagai,et al.  SPOUTED BED WITH A DRAFT-TUBE WITHOUT GAS INLET NOZZLE OR ORIFICE , 1996 .

[5]  Q. Yao,et al.  Effects of Draft Tubes on Particle Velocity Profiles in Spouted Beds , 2006 .

[6]  Leo A. Behie,et al.  SOLIDS CIRCULATION IN SPOUTED AND SPOUT-FLUID BEDS WITH DRAFT-TUBES , 1990 .

[7]  Hiroshi Nagashima,et al.  Hydrodynamics of a spouted bed with a porous draft tube containing a small amount of finer particles , 2003 .

[8]  Anthony G. Fane,et al.  Spouting with a porous draft-tube , 1983 .

[9]  Javier Bilbao,et al.  Effect of operating conditions on solid velocity in the spout, annulus and fountain of spouted beds , 2001 .

[10]  J. Bilbao,et al.  Operating Conditions of Conical Spouted Beds with a Draft Tube. Effect of the Diameter of the Draft Tube and of the Height of Entrainment Zone , 2007 .

[11]  Atsushi Tsutsumi,et al.  Solid Circulation in a Spouted Bed with a Draft Tube , 1998 .

[12]  S. Ito,et al.  Fluid and Solids Flow Affecting the Solids Circulation Rate in Spouted Beds with a Draft-Tube , 2004 .

[13]  Haritz Altzibar,et al.  A Draft-Tube Conical Spouted Bed for Drying Fine Particles , 2008 .

[14]  John R. Grace,et al.  Particle velocity profiles and solid flow patterns in spouted beds , 1994 .