Please use this identifier to cite or link to this item: http://scholarbank.nus.edu.sg/handle/10635/74687
Title: Numerical simulations and experiments on heat transfer around a probe in the downer reactor of a triple-bed combined circulating fluidized bed
Authors: Cheng, Y. 
Guan, G.
Ishizuka, M.
Fushimi, C.
Tsutsumi, A.
Wang, C.-H. 
Issue Date: 2012
Source: Cheng, Y.,Guan, G.,Ishizuka, M.,Fushimi, C.,Tsutsumi, A.,Wang, C.-H. (2012). Numerical simulations and experiments on heat transfer around a probe in the downer reactor of a triple-bed combined circulating fluidized bed. AIChE 2012 - 2012 AIChE Annual Meeting, Conference Proceedings : -. ScholarBank@NUS Repository.
Abstract: Due to very short residence time in the downer, heat transfer performance inside it has great significance for coal gasification. In this study heat transfer around a heating probe in the downer of a circulating fluidized bed was studied through both experimental and numerical work. Both experimental results and numerical results revealed that average heat transfer coefficients decreased with the increasing superficial air velocity or decreasing solids mass flux, which could be attributed to the decreasing solids holdup, as particle convection was dominant in the heat transfer mechanism under current cases. Numerical simulation also revealed that heat transfer may deteriorate with the increasing particle size. Finally it was found that the heat transfer performance with constant temperature boundary condition around the probe was much better than that with constant heat flux boundary condition. These results may help us better understand the heat transfer in the downer and design downer with high efficiency.
Source Title: AIChE 2012 - 2012 AIChE Annual Meeting, Conference Proceedings
URI: http://scholarbank.nus.edu.sg/handle/10635/74687
ISBN: 9780816910731
Appears in Collections:Staff Publications

Show full item record
Files in This Item:
There are no files associated with this item.

Page view(s)

32
checked on Dec 16, 2017

Google ScholarTM

Check


Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.