Hydrodynamics of gas–solids flow in a bubbling fluidized bed with immersed vertical U-tube banks

Verma, Vikrant; Li, Tingwen; Dietiker, Jean-François; Rogers, William A.

doi:10.1016/j.cej.2015.11.049

Hydrodynamics of gas–solids flow in a bubbling fluidized bed with immersed vertical U-tube banks

Journal Article · Tue Mar 01 04:00:00 EST 2016 · Chemical Engineering Journal

DOI:https://doi.org/10.1016/j.cej.2015.11.049· OSTI ID:1478627

Verma, Vikrant ^[1]; Li, Tingwen ^[2]; Dietiker, Jean-François ^[3]; Rogers, William A. ^[1]

National Energy Technology Lab. (NETL), Morgantown, WV (United States)
National Energy Technology Lab. (NETL), Morgantown, WV (United States) ; AECOM Energy & Construction, Inc., Cleveland, OH (United States)
National Energy Technology Lab. (NETL), Morgantown, WV (United States); West Virginia Univ., Morgantown, WV (United States)

Our team applies a two-fluid model (TFM) from the open-source code Multiphase Flow with Interphase eXchanges (MFIX) to investigate hydrodynamics in a gas–solids fluidized bed with immersed vertical tubes. The cut-cell method implemented in MFIX is used to fully resolve the flow around vertical U-tube banks. Simulations are performed in a bed diameter of 0.145 m with square and triangular tube arrangements, for inlet gas velocities of U0/Umf = 2.3, 4.5 and 6.8. Simulation results are compared with experimental results from the literature and show very good agreement for the bubble size. The efficiency of vertical tubes in reducing bubble size depends upon inlet gas velocity and tube arrangement. Reduction in bubble size is due to the vertical tubes preventing bubble coalescence and promoting bubble splitting. In-bed vertical tubes result in uniform distribution of bubbles within the bed with increase in bubble frequency. The bubble frequency is higher within the bed for square tube arrangements. For a bed with vertical tubes, the bubble shape is generally elongated, which results in high bubble rise velocity. Axial solid velocity and solids circulation patterns are significantly affected by the vertical tubes, where triangular tube arrangements rarely show any solids circulating zone.

View Accepted Manuscript (DOE)

Research Organization:: National Energy Technology Laboratory (NETL), Pittsburgh, PA, Morgantown, WV, and Albany, OR (United States)

Sponsoring Organization:: USDOE Office of Fossil Energy (FE)

OSTI ID:: 1478627

Alternate ID(s):: OSTI ID: 1358908

Journal Information:: Chemical Engineering Journal, Journal Name: Chemical Engineering Journal Journal Issue: C Vol. 287; ISSN 1385-8947

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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