The Physical Models of Cyclone Diplegs in Fluidized Beds

作     者：K.Smolders D.Geldart J.Baeyens 

作者机构：InstituteforEnvironmentalSciencesUniversityofAntwerpUniversiteitsplein12610WilrijkBelgium DepartmentofChemicalEngineeringUniversityofBradford7RichmondRoadlBradfordBD71DPUnitedKingdom DepartmentofChemicalEngineeringKatholiekeUniversiteitLeuvendeCroyla~n463001HeverleeBelgium 

出 版 物：《Chinese Journal of Chemical Engineering》 (中国化学工程学报（英文版）)

年 卷 期：2001年第9卷第4期

页      面：337-347页

核心收录：

学科分类：0710[理学-生物学] 0830[工学-环境科学与工程（可授工学、理学、农学学位）] 081704[工学-应用化学] 0817[工学-化学工程与技术] 08[工学] 081701[工学-化学工程] 0703[理学-化学] 

主　　题：cyclone dipleg fluidized bed physical model 

摘      要：In most industrial fluidization units, two- or three-stage cyclone systems are used to clean the product gases. To return the solids to the bed, these cyclones are fitted with diplegs. By pass of gas from the bed through the dipleg is partially overcome by the back pressure build-up in the dipleg and by adding a trickle valve at the bottom of the dipleg. Diplegs of primary cyclones, operating at a high solid loading behave differently from diplegs of secondary and tertiary cyclones which operate at low solid loading. Both types have been investigated by pressure drop measurements, visual observation and by measurements of the air flow rate flowing up the riser. The primary dipleg was also studied using electrical capacitance tomography. The results are reported hereafter and will give a first indication towards the right design of the dipleg and the selection of the trickle valve. The influence of gas flow in the dipleg on the conversion in a catalytic fluidized bed reactor is found to be negligible.