Name: Flávio Lopes Francisco Bittencourt
Type: MSc dissertation
Publication date: 16/12/2016
Advisor:

Namesort descending Role
Marcio Ferreira Martins Advisor *

Examining board:

Namesort descending Role
Harerton Oliveira Dourado External Examiner *
Marcio Ferreira Martins Advisor *
Wellington Betencurte da Silva Internal Examiner *

Summary: Mining plays an important role in the Brazilian national economic scenario, with the presence of several reserves. However, iron as it is extracted from these reserves, is not suitable to be used directly in industry applications and therefore must be processed in order to achieve agglomeration of fines and formation of iron ore pellets. Thermal processing of pellets is widely used to provide reuse of the fines and to give pellets physical and metallurgical properties required for blast furnace operations. In order for these transformations to occur, combustion of gas is used, providing heat and reducing potential to transform the pellets. The problem lies in the complexity found in thermal processes of furnaces and industrial combustors, which is associated with the lack of control commonly found in many industrial plants, resulting in excessive fuel expenses. In the present work, computational simulations were performed using the software ANSYS FLUENT to model a combustor present in an industrial environment. The fuel used is the liquefied petroleum gas (LPG). Flame characteristics such as temperature profile, flame length, product formation rate and turbulent flame speed were analyzed. Two geometries for the combustor were studied: one considering a free exit section and another accounting for a reduced output diameter section. The results showed that the abrupt reduction of the outlet diameter has direct influence on the formation of the flame, making it thinner and narrower due to the action of vortexes at the inlet and outlet region of the combustor. It was possible to determine the reaction zone thickness for both situations and its relationship with the turbulent flame speed.

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