Kinetic analysis of biochar chemical looping gasification with calcium ferrite as oxygen carriers

GAO Pan; HUANG Xing-qi; LIU Yu-tong; ABULAITI Aikeremu; YANG Shao-xia

doi:10.1016/S1872-5813(23)60356-1

Volume 51 Issue 9

Sep. 2023

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Article Navigation > Journal of Fuel Chemistry and Technology > 2023 > 51(9): 1259-1272

GAO Pan, HUANG Xing-qi, LIU Yu-tong, ABULAITI Aikeremu, YANG Shao-xia. Kinetic analysis of biochar chemical looping gasification with calcium ferrite as oxygen carriers[J]. Journal of Fuel Chemistry and Technology, 2023, 51(9): 1259-1272. doi: 10.1016/S1872-5813(23)60356-1

Citation:

GAO Pan, HUANG Xing-qi, LIU Yu-tong, ABULAITI Aikeremu, YANG Shao-xia. Kinetic analysis of biochar chemical looping gasification with calcium ferrite as oxygen carriers[J]. Journal of Fuel Chemistry and Technology, 2023, 51(9): 1259-1272. doi: 10.1016/S1872-5813(23)60356-1

Citation:

GAO Pan, HUANG Xing-qi, LIU Yu-tong, ABULAITI Aikeremu, YANG Shao-xia. Kinetic analysis of biochar chemical looping gasification with calcium ferrite as oxygen carriers[J]. Journal of Fuel Chemistry and Technology, 2023, 51(9): 1259-1272. doi: 10.1016/S1872-5813(23)60356-1

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Kinetic analysis of biochar chemical looping gasification with calcium ferrite as oxygen carriers

doi: 10.1016/S1872-5813(23)60356-1

1.
School of New Energy, North China Electric Power University, Beijing 102206, China
2.
School of water conservancy and Hydropower Engineering, North China Electric Power University, Beijing 102206, China

Funds: The project was supported by the National Natural Science Foundation of China (51206045) and the Fundamental Research Funds for Central Universities (2018MS033)

Received Date: 2023-01-15
Accepted Date: 2023-03-08
Rev Recd Date: 2023-03-05

Available Online: 2023-04-06

Publish Date: 2023-09-30

Abstract

Abstract

The chemical looping gasification (CLG) kinetics of biochars with calcium ferrite as oxygen carriers and the effects of different kinds of calcium ferrite and biochars were investigated by TGA. The properties of biochars and calcium ferrite were analyzed by XRD, SEM, BET, etc. The Škvára-Šesták method was used to determine the kinetic mechanism function. The results show that the reduction reaction rate and the oxygen carrying capacity of oxygen carriers follow the sequence: Ca₂Fe₂O₅ > CaFe₂O₄ > Fe₂O₃, and CaFe₂O₄ > Ca₂Fe₂O₅ > Fe₂O₃, respectively. The oxygen carriers can be completely reduced to Fe and CaO by biochar. The activation energy of CaFe₂O₄ reduction is in the range of 167.44–600.83 kJ/mol; and the activation energy of Ca₂Fe₂O₅ reduction is in the range of 413.62–583.51 kJ/mol. The CaFe₃O₅ generated during the reduction of CaFe₂O₄ may have a negative influence on the lattice oxygen diffusion. The reduction of CaFe₂O₄ can be divided into two stages: when the conversion degree α is less than 0.15, the CaFe₂O₄ is reduced to Ca₂Fe₂O₅ following the random nucleation and nuclei growth model; when α is greater than 0.15, Ca₂Fe₂O₅is further reduced to CaO and Fe following the 3-D diffusion mechanism. The mechanism function of the reduction of Ca₂Fe₂O₅ is the same as that of the second stage of CaFe₂O₄ reduction.
- chemical looping gasification,
- calcium ferrite,
- biochar,
- kinetics

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References(35)

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