Draft tube design based on a borescopic technique in conical spouted beds

Autor(es)

de Brito, Ronaldo Correia ^[1] ; Tellabide, Mikel ^[2] ; Atxutegi, Aitor ^[2] ; Estiati, Idoia ^[2] ; Freire, Jose Teixeira ^[1] ; Olazar, Martin ^[2]

Afiliação do(s) autor(es)

^[1] Univ Fed Sao Carlos, Dept Chem Engn, Rod Washington Luiz, Km 235, BR-13565905 Sao Carlos, SP - Brazil

^[2] Univ Basque Country UPV EHU, Dept Chem Engn, POB 644, E-48080 Bilbao - Spain

• Tipo de documento: Artigo Científico
• Fonte: ADVANCED POWDER TECHNOLOGY; v. 32, n. 11, p. 4420-4431, NOV 2021.
• Citações Web of Science: 0

Resumo

Draft tubes have emerged as promising internal devices to overcome the scale up limitations of the spouted bed. Although only a few parameters define draft tubes, the design of these devices is complex and remains a challenging task, as knowledge concerning the gas-solid flow pattern in the spouted bed is required for a proper implementation. Therefore, this study aims to propose a new criterion for the design of draft tubes (nonporous and open-sided) based on the average spout diameter measured by a borescopic technique in conical spouted beds without draft tube. Based on the radial and axial particle velocity profiles, hydrodynamic analysis, and cycle time distributions, the new configurations are compared with those without tube and with conventional draft tubes. The new open-sided tube provides maximum particle velocities of 480.90 +/- 14.60 mm/s in the spout and 90.10 +/- 4.40 mm/s in the annulus. These values are lower and higher than the particle velocities obtained without draft tube in the spout and annulus regions, respectively, which means it modifies particle residence time in these regions. The new open sided tube provides a more efficient gas-solid contact than any conventional one, with spouting behaviour being very similar to the configuration without tube (differences in the minimum spouting velocity being in the 2-6% range), which is a key aspect for scale up purposes. (c) 2021 The Society of Powder Technology Japan. Published by Elsevier B.V. and The Society of Powder Technology Japan. All rights reserved. (AU)

• Processo FAPESP: 17/01856-7 - Desenvolvimento e otimização energética de um leito de jorro com sistema de recuperação de calor do ar de exaustão, operando sob condições de intermitência
• Beneficiário: Ronaldo Correia de Brito
• Modalidade de apoio: Bolsas no Brasil - Doutorado
• Processo FAPESP: 18/22655-2 - Desenvolvimento e otimização energética de um leito de jorro com sistema de recuperação de calor do ar de exaustão, operando sob condições de intermitência
• Beneficiário: Ronaldo Correia de Brito
• Modalidade de apoio: Bolsas no Exterior - Estágio de Pesquisa - Doutorado