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http://cimav.repositorioinstitucional.mx/jspui/handle/1004/1745| Hydrogen Production by a Fe-based Oxygen Carrier and Methane-Steam Redox Process: Thermodynamic Analysis | |
| MIGUEL JESUS MELENDEZ ZARAGOZA JORGE LUIS DOMINGUEZ ARVIZU JESUS MANUEL SALINAS GUTIERREZ VIRGINIA HIDALINA COLLINS MARTINEZ | |
| Acceso Abierto | |
| Sin Derechos Reservados | |
| Methane-Steam | |
| The redox performance of iron oxide magnetite (Fe3O4) as an oxygen carrier was investigated for hydrogen (H2) and/or syngas (H2+CO) production through a methane-steam redox process using a thermodynamic analysis and process simulation to find most favorable reactions conditions (MFRC). The reaction system was divided in two reactors. In the first reduction step the following reactions were targeted: ¼ CH4(g) + Fe3O4 = 3FeO + ¼ CO2(g) + ½ H2O(g) and CH4(g) + Fe3O4 = 3FeO + 2H2(g) + CO(g), which both represent complete and partial oxidation of methane by an oxygen carrier (Fe3O4). While several other reactions were allowed to proceed such as the carbon formation by methane decomposition as well as further iron reduction to Fe. The CH4/Fe3O4 molar ratio was varied from 0.25- 1 in a temperature range from 300-900 °C. In the second oxidation reactor the solid products from the first reactor were combined with steam to regenerate the oxygen carrier by: 3FeO + H2O(g) = Fe3O4 + H2(g) using a fixed feed of 5.5 mols of H2O in a temperature range of 300-900 °C. Thermodynamic analysis by the Gibbs free energy minimization technique and process simulation were performed in Aspen Plus. Criteria used to find MFRC were: carbon-free formation conditions, reduction and oxidation carrier phases as FeO and Fe3O4, respectively, avoiding the formation of metallic Fe (carbon formation promoter) and the minimum possible operating temperatures for energy saving reasons. Results indicate that in the reduction reactor the MFRC consist in T = 650-700°C and CH4/Fe3O4 = 0.75-1, While for the regenerator were: T = 520-600 °C. Details of the mass and heat balances are also presented | |
| 2016 | |
| Memoria de congreso | |
| Inglés | |
| OTRAS | |
| Versión revisada | |
| submittedVersion - Versión revisada | |
| Aparece en las colecciones: | Artículos de Congresos |
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