Gas dispersion in fast fluidization and dense suspension upflow

Liu Jinzhong; John R. Grace; Bi Hsiaotao; Hiroshi Morikawa; Zhu Jingxu

doi:10.1016/s0009-2509(99)00276-6

Gas dispersion in fast fluidization and dense suspension upflow

Liu Jinzhong, John R. Grace, Bi Hsiaotao, Hiroshi Morikawa, Zhu Jingxu

Research output: Journal Publication › Article › peer-review

47 Citations (Scopus)

Abstract

While gas dispersion has been determined in CFB risers operated at low solids fluxes, data are lacking with respect to the high-density conditions common in FCC risers and other catalytic processes. In this paper experimental results are reported showing gas residence time distributions obtained using helium tracer and FCC particles for a 76 mm diameter riser of height 5.6 m with net solids fluxes extending up to 480 kg/m²s. A radially non-uniform dispersion model is proposed and compard with the axially dispersed plug flow model to determine the gas dispersion coefficients. The results show that gas backmixing becomes small for dense suspension upflow conditions where there is no downflow of solids near the riser wall.

Original language	English
Pages (from-to)	5441-5449
Number of pages	9
Journal	Chemical Engineering Science
Volume	54
Issue number	22
DOIs	https://doi.org/10.1016/s0009-2509(99)00276-6
Publication status	Published - Nov 1999
Externally published	Yes

Keywords

Axial dispersion
Circulating fluidized beds
Fluidization
Gas mixing
Residence time distribution
Suspensions

ASJC Scopus subject areas

General Chemistry
General Chemical Engineering
Industrial and Manufacturing Engineering

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10.1016/s0009-2509(99)00276-6

Cite this

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title = "Gas dispersion in fast fluidization and dense suspension upflow",

abstract = "While gas dispersion has been determined in CFB risers operated at low solids fluxes, data are lacking with respect to the high-density conditions common in FCC risers and other catalytic processes. In this paper experimental results are reported showing gas residence time distributions obtained using helium tracer and FCC particles for a 76 mm diameter riser of height 5.6 m with net solids fluxes extending up to 480 kg/m2s. A radially non-uniform dispersion model is proposed and compard with the axially dispersed plug flow model to determine the gas dispersion coefficients. The results show that gas backmixing becomes small for dense suspension upflow conditions where there is no downflow of solids near the riser wall.",

keywords = "Axial dispersion, Circulating fluidized beds, Fluidization, Gas mixing, Residence time distribution, Suspensions",

author = "Liu Jinzhong and Grace, {John R.} and Bi Hsiaotao and Hiroshi Morikawa and Zhu Jingxu",

note = "Funding Information: We are grateful to the Natural Sciences and Engineering Research Council of Canada for {"}nancial support and to Allan Issangya for his assistance.",

year = "1999",

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doi = "10.1016/s0009-2509(99)00276-6",

language = "English",

volume = "54",

pages = "5441--5449",

journal = "Chemical Engineering Science",

issn = "0009-2509",

publisher = "Elsevier B.V.",

number = "22",

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TY - JOUR

T1 - Gas dispersion in fast fluidization and dense suspension upflow

AU - Jinzhong, Liu

AU - Grace, John R.

AU - Hsiaotao, Bi

AU - Morikawa, Hiroshi

AU - Jingxu, Zhu

N1 - Funding Information: We are grateful to the Natural Sciences and Engineering Research Council of Canada for "nancial support and to Allan Issangya for his assistance.

PY - 1999/11

Y1 - 1999/11

N2 - While gas dispersion has been determined in CFB risers operated at low solids fluxes, data are lacking with respect to the high-density conditions common in FCC risers and other catalytic processes. In this paper experimental results are reported showing gas residence time distributions obtained using helium tracer and FCC particles for a 76 mm diameter riser of height 5.6 m with net solids fluxes extending up to 480 kg/m2s. A radially non-uniform dispersion model is proposed and compard with the axially dispersed plug flow model to determine the gas dispersion coefficients. The results show that gas backmixing becomes small for dense suspension upflow conditions where there is no downflow of solids near the riser wall.

AB - While gas dispersion has been determined in CFB risers operated at low solids fluxes, data are lacking with respect to the high-density conditions common in FCC risers and other catalytic processes. In this paper experimental results are reported showing gas residence time distributions obtained using helium tracer and FCC particles for a 76 mm diameter riser of height 5.6 m with net solids fluxes extending up to 480 kg/m2s. A radially non-uniform dispersion model is proposed and compard with the axially dispersed plug flow model to determine the gas dispersion coefficients. The results show that gas backmixing becomes small for dense suspension upflow conditions where there is no downflow of solids near the riser wall.

KW - Axial dispersion

KW - Circulating fluidized beds

KW - Fluidization

KW - Gas mixing

KW - Residence time distribution

KW - Suspensions

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U2 - 10.1016/s0009-2509(99)00276-6

DO - 10.1016/s0009-2509(99)00276-6

M3 - Article

AN - SCOPUS:0033551942

SN - 0009-2509

VL - 54

SP - 5441

EP - 5449

JO - Chemical Engineering Science

JF - Chemical Engineering Science

IS - 22

ER -

Gas dispersion in fast fluidization and dense suspension upflow

Abstract

Keywords

ASJC Scopus subject areas

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