Axial solids flow structure in a high density gas-solids circulating fluidized bed downer

Chengxiu Wang; Chunyi Li; Jesse Zhu

doi:10.1016/j.powtec.2014.11.041

Axial solids flow structure in a high density gas-solids circulating fluidized bed downer

Chengxiu Wang, Chunyi Li, Jesse Zhu

Research output: Journal Publication › Article › peer-review

35 Citations (Scopus)

Abstract

Axial flow behaviors are investigated with an optical fiber probe using FCC particles at extremely high solids circulation rates up to 700kg/m²s and superficial gas velocity ranging from 3-7m/s in a laboratory-scale downer system. Results show that axial distributions of particle velocity and solids holdup are significantly affected by the operating conditions. Superficial gas velocity is the predominance for particle velocity distribution while solids circulation rate plays a key role in solids holdup distribution. Development of solids flow can be accelerated by increasing superficial gas velocity and/or decreasing solids circulation rate. High solids holdup, higher than 0.06, can be achieved in the entire downer with relatively uniform axial profiles at solids circulation rate of 700kg/m²s indicating a preferential flow with reduced backmixing in the downer.

Original language	English
Pages (from-to)	153-164
Number of pages	12
Journal	Powder Technology
Volume	272
DOIs	https://doi.org/10.1016/j.powtec.2014.11.041
Publication status	Published - 1 Mar 2015
Externally published	Yes

Keywords

Circulating fluidized bed downer
Flow development
High density
Hydrodynamics
Particle velocity
Solids holdup

ASJC Scopus subject areas

General Chemical Engineering

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10.1016/j.powtec.2014.11.041

Cite this

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title = "Axial solids flow structure in a high density gas-solids circulating fluidized bed downer",

abstract = "Axial flow behaviors are investigated with an optical fiber probe using FCC particles at extremely high solids circulation rates up to 700kg/m2s and superficial gas velocity ranging from 3-7m/s in a laboratory-scale downer system. Results show that axial distributions of particle velocity and solids holdup are significantly affected by the operating conditions. Superficial gas velocity is the predominance for particle velocity distribution while solids circulation rate plays a key role in solids holdup distribution. Development of solids flow can be accelerated by increasing superficial gas velocity and/or decreasing solids circulation rate. High solids holdup, higher than 0.06, can be achieved in the entire downer with relatively uniform axial profiles at solids circulation rate of 700kg/m2s indicating a preferential flow with reduced backmixing in the downer.",

keywords = "Circulating fluidized bed downer, Flow development, High density, Hydrodynamics, Particle velocity, Solids holdup",

author = "Chengxiu Wang and Chunyi Li and Jesse Zhu",

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year = "2015",

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doi = "10.1016/j.powtec.2014.11.041",

language = "English",

volume = "272",

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journal = "Powder Technology",

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T1 - Axial solids flow structure in a high density gas-solids circulating fluidized bed downer

AU - Wang, Chengxiu

AU - Li, Chunyi

AU - Zhu, Jesse

PY - 2015/3/1

Y1 - 2015/3/1

N2 - Axial flow behaviors are investigated with an optical fiber probe using FCC particles at extremely high solids circulation rates up to 700kg/m2s and superficial gas velocity ranging from 3-7m/s in a laboratory-scale downer system. Results show that axial distributions of particle velocity and solids holdup are significantly affected by the operating conditions. Superficial gas velocity is the predominance for particle velocity distribution while solids circulation rate plays a key role in solids holdup distribution. Development of solids flow can be accelerated by increasing superficial gas velocity and/or decreasing solids circulation rate. High solids holdup, higher than 0.06, can be achieved in the entire downer with relatively uniform axial profiles at solids circulation rate of 700kg/m2s indicating a preferential flow with reduced backmixing in the downer.

AB - Axial flow behaviors are investigated with an optical fiber probe using FCC particles at extremely high solids circulation rates up to 700kg/m2s and superficial gas velocity ranging from 3-7m/s in a laboratory-scale downer system. Results show that axial distributions of particle velocity and solids holdup are significantly affected by the operating conditions. Superficial gas velocity is the predominance for particle velocity distribution while solids circulation rate plays a key role in solids holdup distribution. Development of solids flow can be accelerated by increasing superficial gas velocity and/or decreasing solids circulation rate. High solids holdup, higher than 0.06, can be achieved in the entire downer with relatively uniform axial profiles at solids circulation rate of 700kg/m2s indicating a preferential flow with reduced backmixing in the downer.

KW - Circulating fluidized bed downer

KW - Flow development

KW - High density

KW - Hydrodynamics

KW - Particle velocity

KW - Solids holdup

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DO - 10.1016/j.powtec.2014.11.041

M3 - Article

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SN - 0032-5910

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JO - Powder Technology

JF - Powder Technology

ER -

Axial solids flow structure in a high density gas-solids circulating fluidized bed downer

Abstract

Keywords

ASJC Scopus subject areas

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