Redox degrees of iron-based oxygen carriers in cyclic chemical looping combustion using thermodynamic analysis

Wei Hsin Chen, Kuan Hsiang Chen, Aristotle T. Ubando, Wen Jhy Lee, Man Hin Chio

研究成果: Article同行評審

11 引文 斯高帕斯(Scopus)

摘要

Chemical looping combustion (CLC) provides a sustainable production of energy while inherently capturing carbon dioxide using oxygen carriers (OCs). To efficiently operate the reactor of the CLC, a thermodynamic analysis of OC is essential. This study focuses on the complete thermodynamic analysis of CLC employing iron-based OCs. In the analysis, methane as a reduction gas and air as an oxidizer along with the fuel and air reactors operated at 900 °C. Six different methane-to-hematite molar ratios (M/H) and O2-to-hematite molar ratio (O/H) on iron oxide redox reactions are evaluated. The redox degree, including reduction and oxidation degrees of OCs in the fuel and air reactors, is introduced to figure out their performance. The results reveal that M/H = 1/15 with O/H = 1 yields the highest CO2 and H2O yields. Under six O/H ratios with M/H = 1/12, the highest CO2 and H2O yields are achieved at O/H ≥ 0.18. These operation conditions are conducive to carbon capture. In most cases of reduction and oxidation reactions, Fe3O4 and Fe2O3 account for the largest shares of iron in the OCs, respectively. The results show that a decrease in oxygen input to the air reactor leads to more carbon formed in the system. An enthalpy balance indicates an overall exothermic reaction behavior. Introducing the redox degree suggests that the optimal operation conditions are at M/H = 1/12 and O/H = 0.18. This study has provided crucial information about the operation and reactivity of iron oxides with methane in the chemical looping combustion process.

原文English
文章編號130834
期刊Chemical Engineering Journal
426
DOIs
出版狀態Published - 2021 12月 15

All Science Journal Classification (ASJC) codes

  • 一般化學
  • 環境化學
  • 一般化學工程
  • 工業與製造工程

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