Pressure and apparent voidage profiles for riser with an abrupt exit (T-shape) in a CFB riser operating above fast fluidization regimes

Monazam, Esmail R.; Breault, Ronald W.; Shadle, Lawrence J.

doi:10.1016/j.powtec.2015.12.041

Title: Pressure and apparent voidage profiles for riser with an abrupt exit (T-shape) in a CFB riser operating above fast fluidization regimes

Journal Article · Wed Dec 30 00:00:00 EST 2015 · Powder Technology

DOI:https://doi.org/10.1016/j.powtec.2015.12.041· OSTI ID:1477166

Monazam, Esmail R. ^[1];

^[2]; Shadle, Lawrence J. ^[2]

REM Engineering Services, PLLC, Morgantown, WV (United States)
National Energy Technology Lab. (NETL), Morgantown, WV (United States)

The influence of abrupt exit (T-shaped) configuration on the riser axial pressure profile in a large-scale circulating fluidized bed (CFB) is examined. A new analysis was developed to predict the axial voidage along the length of influence in the exit region with T-shape geometry. The exit region was characterized using non-dimensional analysis of the continuum equations (balances of masses and momenta) that described multiphase flows. In addition to deceleration length due to abrupt exit, the boundary condition for the solid fraction at the top of the riser and the fully developed regions, were measured using an industrial scale circulating fluidized bed (CFB) of 0.3 m diameter and 15 m tall. The operating factors affecting the flow development in the exit region were determined for three materials of various sizes and densities in core annular and dilute regimes of the riser. Performance data were taken from statistically designed experiments over a wide range of Fr (0.5–39), Re (8–600), Ar (29–3600), load ratio (0.2–28), riser to particle diameter ratio (375–5000), and gas to solid density ratio (138–1381). A series of correlations were developed to predict the voidage at the exit of the riser and length of influence due to the exit geometry. Finally, the correlations are based on gas and solid properties, operating conditions, and riser geometry.

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Research Organization:: National Energy Technology Lab. (NETL), Pittsburgh, PA, and Morgantown, WV (United States). In-house Research

Sponsoring Organization:: USDOE

OSTI ID:: 1477166

Alternate ID(s):: OSTI ID: 1359796

Journal Information:: Powder Technology, Vol. 291, Issue C; ISSN 0032-5910

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 18 works

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References (17)

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Gas-solid Flow Behaviors in a Pressurized Multi-stage Circulating Fluidized Bed with Geldart Group B Particles Nie, Wei; Feng, Rongtao; Li, Junguo International Journal of Chemical Reactor Engineering, Vol. 17, Issue 12 https://doi.org/10.1515/ijcre-2019-0087	journal	October 2019

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Title: Pressure and apparent voidage profiles for riser with an abrupt exit (T-shape) in a CFB riser operating above fast fluidization regimes

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