skip to main content

DOE PAGESDOE PAGES

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

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.more » Finally, the correlations are based on gas and solid properties, operating conditions, and riser geometry.« less
Authors:
 [1] ; ORCiD logo [2] ;  [2]
  1. REM Engineering Services, PLLC, Morgantown, WV (United States)
  2. National Energy Technology Lab. (NETL), Morgantown, WV (United States)
Publication Date:
Type:
Accepted Manuscript
Journal Name:
Powder Technology
Additional Journal Information:
Journal Volume: 291; Journal Issue: C; Journal ID: ISSN 0032-5910
Publisher:
Elsevier
Research Org:
National Energy Technology Lab. (NETL), Pittsburgh, PA, and Morgantown, WV (United States). In-house Research
Sponsoring Org:
USDOE
Country of Publication:
United States
Language:
English
Subject:
42 ENGINEERING; Riser; Pressure profile; Circulating fluidized bed
OSTI Identifier:
1477166
Alternate Identifier(s):
OSTI ID: 1359796

Monazam, Esmail R., Breault, Ronald W., and Shadle, Lawrence J.. Pressure and apparent voidage profiles for riser with an abrupt exit (T-shape) in a CFB riser operating above fast fluidization regimes. United States: N. p., Web. doi:10.1016/j.powtec.2015.12.041.
Monazam, Esmail R., Breault, Ronald W., & Shadle, Lawrence J.. Pressure and apparent voidage profiles for riser with an abrupt exit (T-shape) in a CFB riser operating above fast fluidization regimes. United States. doi:10.1016/j.powtec.2015.12.041.
Monazam, Esmail R., Breault, Ronald W., and Shadle, Lawrence J.. 2015. "Pressure and apparent voidage profiles for riser with an abrupt exit (T-shape) in a CFB riser operating above fast fluidization regimes". United States. doi:10.1016/j.powtec.2015.12.041. https://www.osti.gov/servlets/purl/1477166.
@article{osti_1477166,
title = {Pressure and apparent voidage profiles for riser with an abrupt exit (T-shape) in a CFB riser operating above fast fluidization regimes},
author = {Monazam, Esmail R. and Breault, Ronald W. and Shadle, Lawrence J.},
abstractNote = {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.},
doi = {10.1016/j.powtec.2015.12.041},
journal = {Powder Technology},
number = C,
volume = 291,
place = {United States},
year = {2015},
month = {12}
}