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Study and modelling of a reactional tube bundle heated by a fluidized bed

Thesis/Dissertation:

Abstract

Fluidized beds exhibit two important characteristics for the heating of a reactional tube bundle: homogeneous temperature within all the fluidized bed and high heat transfer coefficient with the immersed surfaces. One of the key points for their modeling is the knowledge of the vertical and horizontal thermal conductivities and the heat transfer coefficient at the wall or with the tubes of the reactor. As thermal diffusivity data about large fluidized beds are not available in the literature, we have built a large size pilot unit (0.6 m x 1.1 m x 2.8 m) to determine these values under the conditions of a catalytic treatment of petroleum products. The measure of local temperatures and the use of a two-dimensional diffusion model have permitted us to determine thermal conductivities as a function of several parameters: fluidization velocity, height of the bed, nature and granulometry of solids and geometry of the tube bundle. On the basis of the collected experimental data, the case of a petrochemical unit has been studied. A mathematical code was developed, which permitted us to acquire the data concerning the progress of the reaction in the tubes and it also allowed us to analyse the influence of size and  More>>
Publication Date:
Jul 01, 1993
Product Type:
Thesis/Dissertation
Report Number:
IFP-40719
Reference Number:
SCA: 020400; PA: FRC-94:000145; EDB-94:011714; NTS-94:008425; ERA-19:006092; SN: 94001122937
Resource Relation:
Other Information: TH: These (D. es Sc.); PBD: Jul 1993
Subject:
02 PETROLEUM; FLUIDIZED BED REACTORS; TUBES; FLUIDIZED BEDS; HEAT TRANSFER; THERMAL CONDUCTIVITY; AROMATICS; SYNTHESIS; THERMAL DIFFUSIVITY; THERMAL DIFFUSION; BENCH-SCALE EXPERIMENTS; EXPERIMENTAL DATA; CHEMICAL REACTORS; TWO-DIMENSIONAL CALCULATIONS; COMPUTERIZED SIMULATION; PETROCHEMICAL PLANTS; CATALYSIS; 020400; PROCESSING
OSTI ID:
10114310
Research Organizations:
Paris-6 Univ., 75 (France); Ecole Nationale Superieure du Petrole et des Moteurs (ENSPM), 92 - Rueil-Malmaison (France)
Country of Origin:
France
Language:
French
Other Identifying Numbers:
Other: ON: DE94728740; TRN: FR9400145
Availability:
OSTI; NTIS (US Sales Only)
Submitting Site:
FR
Size:
157 p.
Announcement Date:
Jun 30, 2005

Thesis/Dissertation:

Citation Formats

Collantes Hernandez, M A. Study and modelling of a reactional tube bundle heated by a fluidized bed. France: N. p., 1993. Web.
Collantes Hernandez, M A. Study and modelling of a reactional tube bundle heated by a fluidized bed. France.
Collantes Hernandez, M A. 1993. "Study and modelling of a reactional tube bundle heated by a fluidized bed." France.
@misc{etde_10114310,
title = {Study and modelling of a reactional tube bundle heated by a fluidized bed}
author = {Collantes Hernandez, M A}
abstractNote = {Fluidized beds exhibit two important characteristics for the heating of a reactional tube bundle: homogeneous temperature within all the fluidized bed and high heat transfer coefficient with the immersed surfaces. One of the key points for their modeling is the knowledge of the vertical and horizontal thermal conductivities and the heat transfer coefficient at the wall or with the tubes of the reactor. As thermal diffusivity data about large fluidized beds are not available in the literature, we have built a large size pilot unit (0.6 m x 1.1 m x 2.8 m) to determine these values under the conditions of a catalytic treatment of petroleum products. The measure of local temperatures and the use of a two-dimensional diffusion model have permitted us to determine thermal conductivities as a function of several parameters: fluidization velocity, height of the bed, nature and granulometry of solids and geometry of the tube bundle. On the basis of the collected experimental data, the case of a petrochemical unit has been studied. A mathematical code was developed, which permitted us to acquire the data concerning the progress of the reaction in the tubes and it also allowed us to analyse the influence of size and density of the tube bundles on the conversion. (author). 72 refs., 90 figs., 15 tabs.}
place = {France}
year = {1993}
month = {Jul}
}