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Solid Recycle Characteristics of Loop‐seals in a Circulating Fluidized Bed
Author(s) -
Kim S. W.,
Namkung W.,
Kim S. D.
Publication year - 2001
Publication title -
chemical engineering and technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.403
H-Index - 81
eISSN - 1521-4125
pISSN - 0930-7516
DOI - 10.1002/1521-4125(200108)24:8<843::aid-ceat843>3.0.co;2-d
Subject(s) - aeration , loop (graph theory) , mass flux , flux (metallurgy) , fluidized bed combustion , fluidized bed , seal (emblem) , volumetric flow rate , materials science , fluidization , mechanics , mass flow rate , chemistry , waste management , thermodynamics , metallurgy , physics , engineering , mathematics , art , combinatorics , visual arts
Solid recycle characteristics through a conventional and a newly developed loop‐seal (0.08 m i.d.) system are determined in a circulating fluidized bed of FCC or silica sand particles. In the loop‐seal developed here, gas was injected downward tangentially to the wall of the loop‐seal to increase solids mass flux with stable flow. For conventional loop‐seal, solids mass fluxes increase linearly with increasing aeration rate but it reaches a maximum value. At the same aeration rate with different aeration locations (0.1 – 0.6 m) in a conventional loop‐seal, a maximum solids mass flux is seen at a height to diameter ratio of 2.5. For the newly developed loop‐seal, mass fluxes of FCC and sand particles are higher and more stable than in conventional loop‐seal at the same aeration rate. The solid mass fluxes obtained have been correlated with the aeration rate and Archimedes number.