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

Xu, C., Zhang, Y., Wang, L., Zhang, Y., Yang, T., Qiu, F., . . . Dong, K. (2024). Experimental investigation of bed-to-wall heat transfer in fluidized beds of a Geldart B sorbent particle under a full spectrum of fluidization regime. Particuology, 93, 235-246. https://doi.org/10.1016/j.partic.2024.07.001

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

Chenhuan Xu^a, Yongmin Zhang^a *, Liang Wang^a, Yiming Zhang^a, Tianlei Yang^b, Feng Qiu^b, Cenfan Liu^c, Shuai Jiang^b, Ke Dong^a

a State Key Laboratory of Heavy Oil Processing, China University of Petroleum, Beijing, 102249, China
b Beijing DERUNCHEN Environmental Protection Technology Co., Ltd, Beijing, 100022, China
c Key Laboratory of Special Equipment Safety and Energy-saving for State Market Regulation, China Special Equipment Inspection and Research Institute, Beijing, 100029, China

10.1016/j.partic.2024.07.001

Volume 93, October 2024, Pages 235-246

Received 24 May 2024, Revised 29 June 2024, Accepted 2 July 2024, Available online 10 July 2024, Version of Record 17 July 2024.

E-mail: zhym@cup.edu.cn

Highlights

• Bed-to-wall heat transfer of solid amine sorbents for CO₂ capture were studied.

• A full spectrum of fluidization regime was conducted systematically.

• Heat transfer coefficient of Geldart B particles peaks within bubbling fluidized bed.

• Opposite radial profiles of heat transfer coefficients in bubbling and turbulent beds.

• Gas forced convection heat transfer dominants in a dilute-particle fast fluidized bed.

Abstract

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 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 CO₂ capture processes.

Graphical abstract

Keywords

Bed-to-wall heat transfer; Solid amine sorbent; Geldart B particle; Full spectrum of fluidization regime; Correlation

文章导读