Análise avaliativa dos mecanismos de reação para modelar a combustão de gases derivados da biomassa
Publicado 2022-07-30
Palavras-chave
- Biomassa,
- Gás de síntese,
- Combustão,
- Cinética química,
- Mecanismo de reação
- Atraso na inicialização ...Mais
Como Citar
Copyright (c) 2022 David Sebastian Pérez Gordillo, Juan Miguel Mantilla González
Este trabalho está licenciado sob uma licença Creative Commons Attribution 4.0 International License.
Resumo
Parte fundamental na simulação de processos de combustão é modelar com a maior precisão possível a cinética química que ocorre no fenômeno. Por outro lado, em simulações de combustão complexas que envolvem a dinâmica de fluidos computacional (CFD) do sistema, o recurso computacional é um fator crítico a ser levado em consideração. Com base no exposto, este estudo avalia o desempenho de quatro mecanismos de reação semi-detalhados (DRM22, C1-C4 de Heghes, GRI 3.0 e Konnov),
para modelar a cinética de combustão de gases de síntese derivados de biomassa em simulações de CFD. (Motores, turbinas, queimadores, entre outros). A metodologia consiste na realização de testes computacionais para obtenção de resultados relativos à variável de atraso na partida. As ditas simulações foram realizadas em um reator de pressão constante variando diferentes parâmetros de combustão. Os resultados obtidos com os mecanismos semi-detalhados foram comparados com os obtidos com um mecanismo detalhado (Westbrook), calculando os erros. Constatou-se que a aplicabilidade de cada modelo cinético depende das variáveis do processo analisadas, onde a qualidade dos seus as previsões são sempre inversamente proporcionais ao teor de hidrogênio no combustível. Vale ressaltar que o mecanismo GRI 3.0 apresentou o melhor desempenho geral.
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