Banca de DEFESA: DANIEL DE ARAÚJO COSTA RODRIGUES

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
DISCENTE : DANIEL DE ARAÚJO COSTA RODRIGUES
DATA : 05/03/2018
HORA: 14:30
LOCAL: LABORATÓRIO DE ENERGIA ALTERNATIVA E FENÔMENOS DE TRANSPORTE - LEAFT
TÍTULO:

"Bayer Process Gibbsite Autoprecipitation Process Modelling in Thickeners"

 

 

 

 

PALAVRAS-CHAVES:

Bayer Process; autoprecipitation; Alumina; thickening; gibbsite reversion; bauxit

PÁGINAS: 100
GRANDE ÁREA: Engenharias
ÁREA: Engenharia Química
RESUMO:

Most Bayer refineries monitor carefully alumina losses. One of the prominent effects that cause it is auto precipitation in the clarification circuit. This document proposes a conceptual model for the representation of the process nuances, considering settler solids profile and composition, and the uneven fluid flow behavior of a vessel of this type.

The model consists in discretization of decanter zones and representation of mixing, reaction, and splitting. It is proven to be at zero degrees of freedom independently of the composition detail on liquor and solids composition through a generalized degrees of freedom analysis for an undefined number of components and stages. The effect of model parameters such as number of stages, feed stream position, and mud bed level on the model response and stability is analyzed so to propose an ideal range of numerical modelling conditions.

The proposed model did not show multiple steady states and attains results that are in accordance with reality. Additionally, the impact of the number of discretization does not add to the model capacity, in fact it is detrimental to it by adding numerical instability.

MEMBROS DA BANCA:
Presidente - 1584174 - DOMINGOS FABIANO DE SANTANA SOUZA
Interno - 1547970 - JACKSON ARAUJO DE OLIVEIRA
Externo à Instituição - JOSE ROBERTO DE SOUZA - CTGás
Externo à Instituição - JUAN ALBERTO CHAVEZ RUIZ - CTGás