Engenharia Química
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Programa de Pós-Graduação em Engenharia Química
Centro: CCAE
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URL do programa: http://www.engenhariaquimica.alegre.ufes.br/pos-graduacao/PPEQ
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Navegando Engenharia Química por Autor "Abreu, Luiz Alberto da Silva"
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- ItemEstudo numérico da aplicação do sistema gerador de nitrogênio para remoção de depósitos de parafina(Universidade Federal do Espírito Santo, 2024-04-24) Cavalcante, Rafael Ferreira; Dutra, Julio Cesar Sampaio ; https://orcid.org/0000-0001-6784-4150; http://lattes.cnpq.br/5331990513570911; Silva, Wellington Betencurte da ; https://orcid.org/0000-0003-2242-7825; http://lattes.cnpq.br/6900925458823632 ; https://orcid.org/0009-0005-5585-071X ; http://lattes.cnpq.br/2615634585069482 ; Estumano, Diego Cardoso ; https://orcid.org/0000-0003-4318-4455; http://lattes.cnpq.br/5521162828533153; Abreu, Luiz Alberto da Silva ; https://orcid.org/0000-0002-7634-7014; http://lattes.cnpq.br/2157391120883842Offshore oil exploration has significant challenges, including the formation of hydrate and paraffin wax deposits, causing billionaire losses to the oil and natural gas industry. The nitrogen generating system (SGN) is a thermal and chemical technique applied to remove these deposits, employing an exothermic chemical reaction that promotes paraffin wax melting. Pipe-in-pipe (PIP) systems with thermal insulation layers are common in this scenario, aiming to optimize the system’s thermal efficiency. This dissertation conducts to a numerical study of an SGN application in a multilayer PIP system with paraffin wax blockage, to investigate the efficiency and feasibility of the technique in removing the deposit without compromising the PIP’s insulation materials. The mathematical formulation yields to a nonlinear transient two dimensional heat conduction model with chemical reaction and phase change. The solution of the transient problem employs the explicit Euler method for time integration, with spatial derivatives computed directly from the temperature nodal values. The results demonstrate that the SGN’s chemical reagents are quickly consumed, generating a high amount of heat, sufficient to remove the paraffin wax deposit. The simulation reaches a liquid fraction of 0.95. The results also show that the temperature of the thermal insulation layers exceeds their ideal working temperature, but remains below their melting point, reaching 140 ◦C in the innermost insulation layer. Additionally, the results indicate that the released heat is strongly dependent on the pH at which the reaction occur