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Effective H2S control during chemical looping combustion by iron ore modified with alkaline earth metal oxides

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  • Wang, Haiming
  • Liu, Guicai
  • Veksha, Andrei
  • Giannis, Apostolos
  • Lim, Teik-Thye
  • Lisak, Grzegorz

Abstract

Iron ore (IO) modified with alkaline earth metal (AEM) oxides were developed as oxygen carriers (OCs) for the chemical looping combustion (CLC) of simulated municipal solid waste (MSW) syngas to simultaneously reduce the H2S emission. The AEM oxides, especially BaO, were found to improve the CLC performance of IO greatly due to the formation of AEM ferrites, which promoted the lattice oxygen activity. When using the pristine IO, less than 10% of the input H2S could be removed with the remaining being released from the reactor mainly in the form of SO2. The loadings of CaO and MgO were also found to be ineffective in sulfur removal from the syngas, because the sulfur fixation reactions were kinetically and thermodynamically limited for CaO and MgO, respectively. By contrast, over 60% of the input H2S was effectively retained on the BaO-loaded OC in the form of sulfates/sulfites because of the high reactivity between BaCO3 and H2S in the presence of Fe2O3. This study indicates that the IO loaded with BaO showed superior performance both in CLC of syngas and control of sulfur species, which can be used in the CLC of sulfur containing fuels to realize a cleaner combustion process.

Suggested Citation

  • Wang, Haiming & Liu, Guicai & Veksha, Andrei & Giannis, Apostolos & Lim, Teik-Thye & Lisak, Grzegorz, 2021. "Effective H2S control during chemical looping combustion by iron ore modified with alkaline earth metal oxides," Energy, Elsevier, vol. 218(C).
    • Handle: RePEc:eee:energy:v:218:y:2021:i:c:s0360544220326554
    DOI: 10.1016/j.energy.2020.119548
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    References listed on IDEAS

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    1. Chan, Wei Ping & Veksha, Andrei & Lei, Junxi & Oh, Wen-Da & Dou, Xiaomin & Giannis, Apostolos & Lisak, Grzegorz & Lim, Teik-Thye, 2019. "A hot syngas purification system integrated with downdraft gasification of municipal solid waste," Applied Energy, Elsevier, vol. 237(C), pages 227-240.
    2. Wang, Haiming & Dou, Xiaomin & Veksha, Andrei & Liu, Wen & Giannis, Apostolos & Ge, Liya & Thye Lim, Teik & Lisak, Grzegorz, 2020. "Barium aluminate improved iron ore for the chemical looping combustion of syngas," Applied Energy, Elsevier, vol. 272(C).
    3. García-Labiano, F. & de Diego, L.F. & Gayán, P. & Abad, A. & Cabello, A. & Adánez, J. & Sprachmann, G., 2014. "Energy exploitation of acid gas with high H2S content by means of a chemical looping combustion system," Applied Energy, Elsevier, vol. 136(C), pages 242-249.
    4. Nandy, Anirban & Loha, Chanchal & Gu, Sai & Sarkar, Pinaki & Karmakar, Malay K. & Chatterjee, Pradip K., 2016. "Present status and overview of Chemical Looping Combustion technology," Renewable and Sustainable Energy Reviews, Elsevier, vol. 59(C), pages 597-619.
    5. Moldenhauer, Patrick & Rydén, Magnus & Mattisson, Tobias & Younes, Mourad & Lyngfelt, Anders, 2014. "The use of ilmenite as oxygen carrier with kerosene in a 300W CLC laboratory reactor with continuous circulation," Applied Energy, Elsevier, vol. 113(C), pages 1846-1854.
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    1. Ranwei Ren & Haiming Wang & Changfu You, 2022. "Steam Gasification of Refuse-Derived Fuel with CaO Modification for Hydrogen-Rich Syngas Production," Energies, MDPI, vol. 15(21), pages 1-16, November.

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