An Investigation of the Restitution Coefficient Impact on Simulating Sand-Char Mixing in a Bubbling Fluidized Bed

Xinjun Zhao, Qitai Eri and Qiang Wang
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Xinjun Zhao: School of Energy and Power Engineering, Beihang University, Beijing 100191, China
Qitai Eri: School of Energy and Power Engineering, Beihang University, Beijing 100191, China
Qiang Wang: School of Energy and Power Engineering, Beihang University, Beijing 100191, China

Energies, 2017, vol. 10, issue 5, 1-14

Abstract: In the present work, the effect of the restitution coefficient on the numerical results for a binary mixture system of sand particles and char particles in a bubbling fluidized bed with a huge difference between the particles in terms of density and volume fraction has been studied based on two-fluid model along with the kinetic theory of granular flow. Results show that the effect of restitution coefficient on the flow characteristics varies in different regions of the bed, which is more evident for the top region of the bed. The restitution coefficient can be categorized into two classes. The restitution coefficients of 0.7 and 0.8 can be included into one class, whereas the restitution coefficient of 0.9 and 0.95 can be included into another class. Moreover, four vortices can be found in the time-averaged flow pattern distribution, which is very different from the result obtained for the binary system with the similar values between particles in density and volume fraction.

Keywords: restitution coefficient; segregation; flow pattern; bubbling fluidized bed; binary particles; sand; char (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2017
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (2)

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