Elutriation, attrition and segregation in a conical spouted bed with a fountain confiner  

作　　者：Aitor Pablos Roberto Aguado Jorge Vicente Mikel Tellabide Javier Bilbao Martin Olazar 

机构地区：[1]Department of Chemical Engineering,University of the Basque Country UPV/EHU,P.O.Box 644,E48080 Bilbao,Spain [2]Novattia Desarrollos,Ltd.,Scientific and Technologic Park of Bizkaia,Astondo Bidea,Building 612,E48160 Derio,Spain

出　　处：《Particuology》2020年第4期35-44,共10页颗粒学报（英文版）

基　　金：This work was supported by the M inistry of Economy and Competitiveness of the Spanish Government(Project CTQ2016-75535-R);the European Regional Development Funds(ERDF),the European Commission(HORIZON H2020-M SCA RISE-2018,Contract No.823745);the University of the Basque Country UPV/EHU(US16/21);and performed in collaboration with Novattia Desarrollos,Ltd.Aitor Pablos is grateful for a Ph.D.grant from the University of the Basque Country UPV/EHU.

摘　　要：This study examined elutriation,attrition,and segregation in a conical spouted bed with a fountain confiner and incorporating an open sided draft tube.Fine silica sand with a wide particle size distribution was employed as a model material,operating in both the batch and continuous modes.The use of a fountain confiner is crucial when operating with fine particles,because otherwise the bed rapidly exhibits significant entrainment.The extent of attrition was quantified using a tracing technique based on differently-coloured sand fractions as well as monitoring size distributions by sieving.Particle breakage was found to be the primary attrition mechanism,and the fountain confiner was determined to limit the elutriation of fine particles resulting from breakage.Consequently,only a small fraction of the finest particles were entrained from the bed.The incorporation of a confiner increased operational stability while reducing segregation,especially in the upper half of the bed where the majority of segregation typically occurs.Thus,the bed was perfectly mixed apart from very minimal segregation close to the wall and at the bottom of the contactor.These results provide a basis for the design and operation of larger scale equipment for the continuous drying of materials.

关 键 词：Spouted bed Fine sand ELUTRIATION Attrition SEGREGATION Fountain confinement device 

分 类 号：TG61[金属学及工艺—金属切削加工及机床]