首页|Experimental investigation of bed-to-wall heat transfer in fluidized beds of a Geldart B sorbent particle under a full spectrum of fluidization regime
Experimental investigation of bed-to-wall heat transfer in fluidized beds of a Geldart B sorbent particle under a full spectrum of fluidization regime
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Fluidization technology has been used in CO2 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 hydrody-namic 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 flu-idized 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 CO2 capture processes.
Bed-to-wall heat transferSolid amine sorbentGeldart B particleFull spectrum of fluidization regimeCorrelation
Key Laboratory of Special Equipment Safety and Energy-saving for State Market Regulation,China Special Equipment Inspection and Research Institute,Beijing,100029,China
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