Sand attrition in conical spouted beds--颗粒学报PARTICUOLOGY

Fernández-Akarregui, A. R., Makibar, J., Alava, I., Diaz, L., Cueva, F., Aguado, R., Lopez, G., & Olazar, M. (2012). Sand attrition in conical spouted beds. Particuology, 10(5), 592–599. https://doi.org/10.1016/j.partic.2012.02.002

Sand attrition in conical spouted beds

Aranzazu R. Fernández-Akarregui ^a, Jon Makibar ^a, Isabel Alava ^a, Luis Diaz ^a, Fernando Cueva ^a, Roberto Aguado ^b, Gartzen Lopez ^b, Martin Olazar ^b *

a Ikerlan-IK4, Juan de 4 la Cierva 1, Arabako Parke Teknologikoa, E-01510 Minao, Araba, Spain
b Department of Chemical Engineering, University of the Basque Country, P.O. Box 644, E48080 Bilbao, Spain

10.1016/j.partic.2012.02.002

Volume 10, Issue 5, October 2012, Pages 592-599

Received 19 October 2011, Revised 4 January 2012, Accepted 20 February 2012, Available online 13 April 2012.

E-mail: martin.olazar@ehu.es

Highlights

► Air velocity is the most influential parameter over both attrition kinetics and mass loss.

► The use of draft tube causes a significant reduction of attrition in spouted beds.

► Attrition decreases as temperature is increased due to the less vigorous contact.

Abstract

A study was carried out on the attrition in conical spouted beds using two sands with different properties for several bed heights and gas flow rates. Furthermore, the influence of a draft tube was studied at ambient and high temperatures. The main objective was to acquire knowledge on the attrition of sand beds for biomass pyrolysis in a pilot plant provided with a conical spouted bed reactor. A first-order kinetic equation is proposed for sand attrition in a conical spouted bed at room temperature. The predicted attrition rate constant depends exponentially on excess air velocity over that for minimum spouting. Both the draft tube and temperature increase contribute to reduction of attrition.

Graphical abstract

Keywords

Attrition; Conical spouted bed; Draft tube; Sand attrition

文章导读