Experimental investigation of bed-to-wall heat transfer in fluidized beds of a Geldart B sorbent particle under a full spectrum of fluidization regime  

作　　者：Chenhuan Xu Yongmin Zhang Liang Wang Yiming Zhang Tianlei Yang Feng Qiu Cenfan Liu Shuai Jiang Ke Dong 

机构地区：[1]State Key Laboratory of Heavy Oil Processing,China University of Petroleum,Beijing,102249,China [2]Beijing DERUNCHEN Environmental Protection Technology Co.,Ltd,Beijing,100022,China [3]Key Laboratory of Special Equipment Safety and Energy-saving for State Market Regulation,China Special Equipment Inspection and Research Institute,Beijing,100029,China

出　　处：《Particuology》2024年第10期235-246,共12页颗粒学报（英文版）

基　　金：support by the National Natural Science Foundation of China(grant No.21808245).

摘　　要：Fluidization technology has been used in CO_(2) capture processes, the successful design and operation of the heat exchangers involved in this process require much information on the bed-to-wall heat transfer of the sorbent particles in fluidized states. In this study, the bed-to-wall heat transfer coefficient (h) of a solid amine sorbent was measured by a heat transfer probe in a large-scale circulating fluidized bed cold model unit, where full spectrum of fluidization regimes can be realized. The corresponding hydrodynamic signals were also studied by pressure sensors and optical fiber probes to further explain the newly discovered phenomenon. The results show that in a dense bed, due to the counterbalanced effect of time fraction of packet and packet renewal frequency, h of the Geldart B particle reaches a peak within the bubbling fluidized regime, and the radial distribution of h are opposite in bubbling and turbulent fluidized regimes. In a fast fluidization regime, gas convection becomes the dominant factor affecting h when the solids holdup is low enough. Correlations were provided or recommended to guide the design of heat exchangers in the fluidized bed CO_(2) capture processes.

关 键 词：Bed-to-wall heattransfer Solid amine sorbent Geldart B particle Full spectrum of fluidization regime Correlation 

分 类 号：TQ051.13[化学工程]