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Chemical-looping combustion in a reverse-flow fixed bed reactor

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  • Han, Lu
  • Bollas, George M.

Abstract

A reverse-flow fixed bed reactor concept for CLC (chemical-looping combustion) is explored. The limitations of conventional fixed bed reactors, as applied to CLC, are overcome by reversing the gas flow direction periodically to enhance the mixing characteristics of the bed, thus improving oxygen carrier utilization and energy efficiency with respect to power generation. The reverse-flow reactor is simulated by a dusty-gas model and compared with an equivalent fixed bed reactor without flow reversal. Dynamic optimization is used to calculate conditions at which each reactor operates at maximum energy efficiency. Several cases studies illustrate the benefits of reverse-flow operation for the CLC with CuO and NiO oxygen carriers and methane and syngas fuels. The results show that periodic reversal of the flow during reduction improves the contact between the fuel and unconverted oxygen carrier, enabling the system to suppress unwanted catalytic reactions and axial temperature and conversion gradients. The operational scheme presented reduces the fluctuations of temperature during oxidation and increases the high-temperature heat produced by the process. CLC in a reverse-flow reactor has the potential to achieve higher energy efficiency than conventional fixed bed CLC reactors, when integrated with a downstream gas turbine of a combined cycle power plant.

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  • Han, Lu & Bollas, George M., 2016. "Chemical-looping combustion in a reverse-flow fixed bed reactor," Energy, Elsevier, vol. 102(C), pages 669-681.
    • Handle: RePEc:eee:energy:v:102:y:2016:i:c:p:669-681
    DOI: 10.1016/j.energy.2016.02.057
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    2. Tomasz Czakiert & Jaroslaw Krzywanski & Anna Zylka & Wojciech Nowak, 2022. "Chemical Looping Combustion: A Brief Overview," Energies, MDPI, vol. 15(4), pages 1-19, February.
    3. Güleç, Fatih & Meredith, Will & Sun, Cheng-Gong & Snape, Colin E., 2019. "Selective low temperature chemical looping combustion of higher alkanes with Cu- and Mn- oxides," Energy, Elsevier, vol. 173(C), pages 658-666.
    4. Qiang Tian & Lixin Che & Bin Ding & Qianwei Wang & Qingquan Su, 2017. "Performance of Cu‐Fe‐based oxygen carrier in a CLC process based on fixed bed reactors," Greenhouse Gases: Science and Technology, Blackwell Publishing, vol. 7(4), pages 731-744, August.
    5. Zhang, Hao & Liu, Xiangyu & Hong, Hui & Jin, Hongguang, 2018. "Characteristics of a 10 kW honeycomb reactor for natural gas fueled chemical-looping combustion," Applied Energy, Elsevier, vol. 213(C), pages 285-292.
    6. Zhang, Hao & Hong, Hui & Jiang, Qiongqiong & Deng, Ya'nan & Jin, Hongguang & Kang, Qilan, 2018. "Development of a chemical-looping combustion reactor having porous honeycomb chamber and experimental validation by using NiO/NiAl2O4," Applied Energy, Elsevier, vol. 211(C), pages 259-268.
    7. Han, Lu & Bollas, George M., 2016. "Dynamic optimization of fixed bed chemical-looping combustion processes," Energy, Elsevier, vol. 112(C), pages 1107-1119.
    8. Qiang Tian & Lixin Che & Bin Ding & Qianwei Wang & Qingquan Su, 2018. "Performance of a Cu–Fe‐based oxygen carrier combined with a Ni‐based oxygen carrier in a chemical‐looping combustion process based on fixed‐bed reactors," Greenhouse Gases: Science and Technology, Blackwell Publishing, vol. 8(3), pages 542-556, June.
    9. Lucia Blas & Patrick Dutournié & Mejdi Jeguirim & Ludovic Josien & David Chiche & Stephane Bertholin & Arnold Lambert, 2017. "Numerical Modeling of Oxygen Carrier Performances (NiO/NiAl 2 O 4 ) for Chemical-Looping Combustion," Energies, MDPI, vol. 10(7), pages 1-16, June.

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