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).
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}
}
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}
}