Banca de QUALIFICAÇÃO: ALEXANDRE COSTA GOULART

Uma banca de QUALIFICAÇÃO de MESTRADO foi cadastrada pelo programa.
STUDENT : ALEXANDRE COSTA GOULART
DATE: 02/06/2025
TIME: 14:00
LOCAL: https://meet.google.com/vga-byxp-jma
TITLE:

Investigation of combustor parameters in the Allam Cycle with Chemical Reactor Network Simulations

PAGES: 35
BIG AREA: Engenharias
AREA: Engenharia Aeroespacial
SUBÁREA: Propulsão Aeroespacial
SPECIALTY: Combustão e Escoamento com Reações Químicas
SUMMARY:

The present work studies the Allam Cycle, a power generation cycle that combines oxy-combustion with supercritical CO₂ as a working fluid and shows great promise with high efficiency, being able to reach above 50% overall plant efficiency, and environmentally friendly energy production with ease to combine geological storage of the CO2 generated. This thesis aims to become an extension of the knowledge of detailed chemical kinetics in natural gas combustors under such conditions, investigating crucial combustor aspects within the Allam Cycle using the Chemical Reactor Network (CRN) approach. The study is divided into two stages. Initially, combustion mechanisms are validated, and a CRN is built under standard Brayton Cycle/Gas Turbine conditions to establish a dependable modelling foundation. Subsequently, this framework is applied to Allam Cycle conditions. The process begins with simulating the entire cycle to determine initial combustor parameters following the original design by Allam et al. Following that, validation of a purpose-built mechanism is carried out for oxy-combustion with supercritical CO₂, which includes the validation against basic cases covered by experiments in the literature. Finally, a specialised CRN model is derived from the standard Brayton model with adjustments reflecting the combustor parameters relevant to the Allam Cycle combustor. The ensuing results, accommodating selected key configurations simulated, will enhance the comprehension of how to improve the combustor design within the power cycle, both in terms of combustion efficiency and gas composition. Acknowledging growing interest in the Allam Cycle as a greener option for future energy systems and establishing additional foundation for the fundamental combustion process, aligning with environmental and performance objectives.

COMMITTEE MEMBERS:
Presidente - Interno ao Programa - 2418500 - LORETO PIZZUTI
Membro Titular - Examinador(a) Interno ao Programa - 2418627 - FABIO ANTONIO DA SILVA MOTA
Membro Titular - Examinador(a) Externo ao Programa - 1118440 - ALEXANDRE ALVES
Membro Suplente - Examinador(a) Interno ao Programa - 1985515 - ANTONIO GARRIDO GALLEGO