Rotational asymmetry of reactant concentration and its evolution in a circulating fluidized bed riser--颗粒学报PARTICUOLOGY

Li, D., Ray, A. K., Ray, M. B., & Zhu, J. (2012). Rotational asymmetry of reactant concentration and its evolution in a circulating fluidized bed riser. Particuology, 10(5), 573–581. https://doi.org/10.1016/j.partic.2012.03.012

Rotational asymmetry of reactant concentration and its evolution in a circulating fluidized bed riser

Dongbing Li, Ajay K. Ray, Madhumita B. Ray, Jesse Zhu^*

Department of Chemical and Biochemical Engineering, The University of Western Ontario, London, Ontario, N6A 5B9, Canada

10.1016/j.partic.2012.03.012 Get rights and content

Volume 10, Issue 5, October 2012, Pages 573-581

Received 4 September 2011, Revised 6 March 2012, Accepted 13 March 2012, Available online 20 July 2012.

E-mail: jzhu@uwo.ca

Highlights

► Catalytic ozone decomposition enables studies on rotational asymmetry of reactant distribution in CFB riser.

► Rotational asymmetry can extend to a height close to the length of flow developing zone.

► Rotational asymmetry is intensified with increasing solids circulation rates or reducing superficial gas velocity.

► Solids entrance structure contributes to rotational asymmetry of reactant distributions.

Abstract

Rotational asymmetric distribution of reactant (ozone) concentration and its evolution along with the gas-solid reactive flow were studied in a 76 mm i.d., 10.2 m high circulating fluidized bed (CFB) riser reactor. The superficial gas velocity ranged from 3 to 5 m/s and the solids circulation rates were 50 and 100 kg/(m² s). Experimental results show that the asymmetry of reactant distribution can extend to a height close to the length of flow developing zone of the CFB riser reactor and then disappears. Based on the hydrodynamics of the gas and solid phases in the solids entrance region, this asymmetry can be attributed to the effect of the solids entrance structure.

Graphical abstract

Keywords

Circulating fluidized beds; Riser; Ozone decomposition; Rotational asymmetry

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