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Characteristics of steel slag as an oxygen carrier for chemical looping gasification of sewage sludge

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  • Zhang, Zhiyuan
  • Wang, Xutao
  • Zhang, Lilin
  • Zhou, Hengtao
  • Ju, Rui
  • Rao, Peijun
  • Guo, Xiaoyu
  • Han, Yaqian
  • Chen, Hongwei

Abstract

A comprehensive study was conducted to assess the characteristics of basic oxygen furnace slag (BOFS) and electric arc furnace slag (EAFS) as oxygen carriers for chemical looping gasification (CLG) of sewage sludge (SS). The surface roughness and wear resistance of BOFS were found to be higher than those of EAFS. Further, the oxygen transport capacity of BOFS was higher than that of EAFS at 800 ° C and 900 ° C with the same redox cycles. As the mass ratio increased, the carbon conversion rate and CO2 concentration gradually increased, while the water conversion rate, cold gas efficiency, and H2 and CO concentrations initially increased and then decreased. Both BOFS and EAFS as oxygen carriers had the highest carbon conversion rate and cold gas efficiency when the steam flow rate was 0.15 g min−1. The cyclic reactivity of BOFS as an oxygen carrier in the CLG process decreased faster than that of EAFS. However, the content of combustible components of BOFS as an oxygen carrier was significantly higher than that of EAFS in each cycle. Overall, these results provide a theoretical basis for steel slag as an oxygen carrier for the CLG of SS.

Suggested Citation

  • Zhang, Zhiyuan & Wang, Xutao & Zhang, Lilin & Zhou, Hengtao & Ju, Rui & Rao, Peijun & Guo, Xiaoyu & Han, Yaqian & Chen, Hongwei, 2022. "Characteristics of steel slag as an oxygen carrier for chemical looping gasification of sewage sludge," Energy, Elsevier, vol. 247(C).
    • Handle: RePEc:eee:energy:v:247:y:2022:i:c:s0360544222004376
    DOI: 10.1016/j.energy.2022.123534
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    References listed on IDEAS

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    1. Di, Zichen & Yilmaz, Duygu & Biswas, Arijit & Cheng, Fangqin & Leion, Henrik, 2022. "Spinel ferrite-contained industrial materials as oxygen carriers in chemical looping combustion," Applied Energy, Elsevier, vol. 307(C).
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    4. Liu, Feng & Liu, Jing & Li, Yu & Fang, Ruixue & Yang, Yingju, 2022. "Studies on the synergistically improved reactivity of spinel NiFe2O4 oxygen carrier for chemical-looping combustion," Energy, Elsevier, vol. 239(PB).
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    1. Yang, Jie & Han, Changye & Liu, Yuchen & Yan, Xiang & Dong, Shenlin & Ma, Liping & Dai, Quxiu & Huang, Bing & Sun, Mingyi & Yin, Xia & Xie, Longgui & Du, Wang, 2024. "CO2 capture by the slag from lignite's chemical looping gasification using carbide slag," Energy, Elsevier, vol. 301(C).

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