Hydrodynamic performance of spouted beds with different types of draft tubes

• A spouted bed with different draft tubes was studied by using angular particles.
• Annulus gas flow rate increased while using a conical–cylindrical porous draft tube.
• Annulus gas flow rate reached a level ever obtained by a spouted bed without a draft tube.
• Solid circulation rate was improved by using a conical–cylindrical porous draft tube.

Hydrodynamic performance of spouted beds with four different types of draft tubes has been investigated experimentally. In this work, irregular and angular particles were used as the spouting solids and the results were compared with those of the previous work in which regular and round particles had been used. It was found that the conical–cylindrical porous draft tube was the best option for solid–gas contact and solids circulation as in the case of round particles. Moreover, by using conical–cylindrical porous draft tube, the gas flow rate through the annulus reached 65–70%, equal to the level of a conventional spouted bed.

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