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Hydrodynamic of a fluidized bed reactor with cocurrent downflow of gas and solid

Thesis/Dissertation:

Abstract

Gas-solid transport reactors with cocurrent downflow represent a class of contactors with important industrial application yet there is very little detailed knowledge of their hydrodynamic behaviour. An experimental study has been carried out in a 50 mm diameter reactor, 5 m in height, using Fluid Catalytic Cracking catalyst, in order to obtain certain key parameters such as the axial pressure profile, the gas-solid slip velocity, the average solids concentration and the radial profiles of solids flux. The changing axial and radial behaviour of the flow is essentially determined by the superficial gas velocity. At the bottom of the reactor, the radial profile of the solids flux is uniform for U{sub g} = 3 m.s{sup -1}. At higher velocities, the flux is greater in the center of the reactor and at lower velocities, the situation is inversed with a more important solids flow at the reactor wall. This apparent ambivalence has been related to the observed sign change of the slip velocity: negative for low superficial gas velocities and positive at higher values. A model based on a schematic representation of the flow structure upholds this explanation. (author).
Authors:
Publication Date:
Jul 01, 1993
Product Type:
Thesis/Dissertation
Report Number:
IFP-40772
Reference Number:
SCA: 020400; PA: FRC-94:000146; EDB-94:011713; NTS-94:008298; ERA-19:006093; SN: 94001122938
Resource Relation:
Other Information: TH: These (D. es Sc.); PBD: Jul 1993
Subject:
02 PETROLEUM; FLUIDIZED BED REACTORS; CATALYTIC CRACKING; COUNTERFLOW SYSTEMS; FLUIDIZED BEDS; FLOW MODELS; SLIP VELOCITY; EXPERIMENTAL DATA; BENCH-SCALE EXPERIMENTS; TWO-PHASE FLOW; 020400; PROCESSING
OSTI ID:
10114289
Research Organizations:
Institut National Polytechnique, 31 - Toulouse (France); Institut Francais du Petrole (IFP), 92 - Rueil-Malmaison (France)
Country of Origin:
France
Language:
French
Other Identifying Numbers:
Other: ON: DE94728741; TRN: FR9400146
Availability:
OSTI; NTIS (US Sales Only)
Submitting Site:
FR
Size:
275 p.
Announcement Date:
Jun 30, 2005

Thesis/Dissertation:

Citation Formats

Aubert, E. Hydrodynamic of a fluidized bed reactor with cocurrent downflow of gas and solid. France: N. p., 1993. Web.
Aubert, E. Hydrodynamic of a fluidized bed reactor with cocurrent downflow of gas and solid. France.
Aubert, E. 1993. "Hydrodynamic of a fluidized bed reactor with cocurrent downflow of gas and solid." France.
@misc{etde_10114289,
title = {Hydrodynamic of a fluidized bed reactor with cocurrent downflow of gas and solid}
author = {Aubert, E}
abstractNote = {Gas-solid transport reactors with cocurrent downflow represent a class of contactors with important industrial application yet there is very little detailed knowledge of their hydrodynamic behaviour. An experimental study has been carried out in a 50 mm diameter reactor, 5 m in height, using Fluid Catalytic Cracking catalyst, in order to obtain certain key parameters such as the axial pressure profile, the gas-solid slip velocity, the average solids concentration and the radial profiles of solids flux. The changing axial and radial behaviour of the flow is essentially determined by the superficial gas velocity. At the bottom of the reactor, the radial profile of the solids flux is uniform for U{sub g} = 3 m.s{sup -1}. At higher velocities, the flux is greater in the center of the reactor and at lower velocities, the situation is inversed with a more important solids flow at the reactor wall. This apparent ambivalence has been related to the observed sign change of the slip velocity: negative for low superficial gas velocities and positive at higher values. A model based on a schematic representation of the flow structure upholds this explanation. (author).}
place = {France}
year = {1993}
month = {Jul}
}