Characterization of gas upward-solids downward countercurrent fluidized flow

K. B. Luo; W. Liu; J. X. Zhu; J. M. Beeckmans

doi:10.1016/S0032-5910(00)00277-1

Characterization of gas upward-solids downward countercurrent fluidized flow

K. B. Luo, W. Liu, J. X. Zhu, J. M. Beeckmans

Research output: Journal Publication › Article › peer-review

23 Citations (Scopus)

Abstract

Experiments were carried out in a specially designed 0.025 m i.d., 5 m high gas upflow-solids downflow fluidized bed to measure axial pressure gradient profiles and actual solids holdups. Fluidized catalytic cracking (FCC) particles (ρ_p=1300 kg/m³, d_p=70 μm) and two types of glass beads (ρ_p=2500 kg/m³, d_p=123 and 332 μm) were used. The results show that such counterflow is possible over a large range of operating conditions. The flow development and friction are discussed in relation to the pressure gradient profiles. Based on the changes of the mean particle velocity and the particle slip velocity, the particle agglomeration was studied. The actual solids holdup measured by a pair of pinch valves and the apparent solids holdup calculated from the pressure gradients are also compared for different operating conditions.

Original language	English
Pages (from-to)	36-44
Number of pages	9
Journal	Powder Technology
Volume	115
Issue number	1
DOIs	https://doi.org/10.1016/S0032-5910(00)00277-1
Publication status	Published - 7 Mar 2001
Externally published	Yes

Keywords

Countercurrent
Gas upward
Solids downward

ASJC Scopus subject areas

General Chemical Engineering

Access to Document

10.1016/S0032-5910(00)00277-1

Cite this

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title = "Characterization of gas upward-solids downward countercurrent fluidized flow",

abstract = "Experiments were carried out in a specially designed 0.025 m i.d., 5 m high gas upflow-solids downflow fluidized bed to measure axial pressure gradient profiles and actual solids holdups. Fluidized catalytic cracking (FCC) particles (ρp=1300 kg/m3, dp=70 μm) and two types of glass beads (ρp=2500 kg/m3, dp=123 and 332 μm) were used. The results show that such counterflow is possible over a large range of operating conditions. The flow development and friction are discussed in relation to the pressure gradient profiles. Based on the changes of the mean particle velocity and the particle slip velocity, the particle agglomeration was studied. The actual solids holdup measured by a pair of pinch valves and the apparent solids holdup calculated from the pressure gradients are also compared for different operating conditions.",

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T1 - Characterization of gas upward-solids downward countercurrent fluidized flow

AU - Luo, K. B.

AU - Liu, W.

AU - Zhu, J. X.

AU - Beeckmans, J. M.

PY - 2001/3/7

Y1 - 2001/3/7

N2 - Experiments were carried out in a specially designed 0.025 m i.d., 5 m high gas upflow-solids downflow fluidized bed to measure axial pressure gradient profiles and actual solids holdups. Fluidized catalytic cracking (FCC) particles (ρp=1300 kg/m3, dp=70 μm) and two types of glass beads (ρp=2500 kg/m3, dp=123 and 332 μm) were used. The results show that such counterflow is possible over a large range of operating conditions. The flow development and friction are discussed in relation to the pressure gradient profiles. Based on the changes of the mean particle velocity and the particle slip velocity, the particle agglomeration was studied. The actual solids holdup measured by a pair of pinch valves and the apparent solids holdup calculated from the pressure gradients are also compared for different operating conditions.

AB - Experiments were carried out in a specially designed 0.025 m i.d., 5 m high gas upflow-solids downflow fluidized bed to measure axial pressure gradient profiles and actual solids holdups. Fluidized catalytic cracking (FCC) particles (ρp=1300 kg/m3, dp=70 μm) and two types of glass beads (ρp=2500 kg/m3, dp=123 and 332 μm) were used. The results show that such counterflow is possible over a large range of operating conditions. The flow development and friction are discussed in relation to the pressure gradient profiles. Based on the changes of the mean particle velocity and the particle slip velocity, the particle agglomeration was studied. The actual solids holdup measured by a pair of pinch valves and the apparent solids holdup calculated from the pressure gradients are also compared for different operating conditions.

KW - Countercurrent

KW - Gas upward

KW - Solids downward

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DO - 10.1016/S0032-5910(00)00277-1

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JO - Powder Technology

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ER -

Characterization of gas upward-solids downward countercurrent fluidized flow

Abstract

Keywords

ASJC Scopus subject areas

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