Effects of various parameters on the attrition of bed material in a recirculating fluidized bed with a draft tube |
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| Affiliation: | 1. Collaborative Innovation Center of Chemical Science and Engineering (Tianjin), School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, China;2. State Key Laboratory of Chemical Engineering (Tianjin University), Tianjin 300072, China;1. Process Engineering, Stiftung Institut für Werkstofftechnik, Badgasteiner Strasse 3, 28359 Bremen, Germany;2. Particles and Process Engineering, University of Bremen, Bibliothekstrasse 1, 28359 Bremen, Germany;1. Department of Chemical Engineering, Curtin University, Western Australia, Australia;2. Department of Chemical Engineering, University of Newcastle, New South Wales, Australia;1. Key Laboratory of Coal Gasification and Energy Chemical Engineering of the Ministry of Education, Shanghai Engineering Research Center of Coal Gasification, Institute of Clean Coal Technology, East China University of Science and Technology, Shanghai 200237, China;2. Dipartimento di Ingegneria Industriale, Università degli Studi di Salerno, Via Giovanni Paolo II, 132, I-84084 Fisciano, SA, Italy |
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| Abstract: | We performed an experimental study to investigate the effects of various parameters on the attrition of bed material and its size distribution with increasing operation time in a recirculating fluidized bed (RCFB). The studied parameters included superficial velocity of fluidizing air, bed inventory, and spacing between the jet top and draft tube bottom (spacer height). The bed material was prepared from Indian Standard (IS) Grade I sand from sieves with a size range of 2.20–1.00 mm. Experiments were performed at ambient conditions, with the superficial air velocity ranging from 7.13–9.16 m/s, a bed inventory of 7–10 kg, spacing of 0.085 and 0.045 m between the jet top and draft tube bottom, and an operating time of 40 h. We investigated the influence of these parameters in terms of changes in the size distribution of particles, changes in the %-weight of particles of different size ranges, generation of particles with smaller diameters, the decrease of the downcomer bed height, variations in the coefficient of uniformity and coefficient of curvature, and material loss from entrainment of fines with increasing operation time. The mode of attrition was abrasion in all experiments. We found that with increasing operation time and other parameters (bed inventory, superficial air velocity, and spacer height) attrition of the bed material also increased. Generation and elutriation of fines were more pronounced at higher superficial air velocity, bed inventory, and spacer height. |
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| Keywords: | Attrition Recirculating fluidized bed (RCFB) Fluidization Elutriation Fines |
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