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Numerical study on supercritical water partial oxidation of ethanol with auto-thermal operation

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  • Bei, Lijing
  • Ge, Zhiwei
  • Ren, Changyifan
  • Su, Di
  • Shang, Fei
  • Wang, Yu
  • Guo, Liejin

Abstract

Supercritical water partial oxidation (SCWPO) is a low-carbon, non-polluting organics processing technology with great potential for development. This technology could convert ethanol into hydrogen and energy efficiently. However, conventional SCWPO reactors rely on external heating and thus have the disadvantages of harsh wall material requirements and low system efficiency. There is a lack of research on SCWPO reactors with auto-thermal operation. A numerical study on SCWPO of ethanol with auto-thermal operation under the adiabatic wall condition was conducted. The results of the SCWPO on ethanol were analyzed and compared for different parameters. It was found that the internal field distribution of the reactor for the adiabatic wall condition was significantly different from the thermostatic wall condition. Increasing the ethanol concentration reduced the equivalent ratio of oxidant (ER) required for the reactor to reach the auto-thermal state. Both higher preheated water temperature and longer reactor length could enhance the effect of the SCWPO of ethanol. When the reactor length was 4 m and the preheat water temperature was 600 °C, carbon gasification efficiency (CE) could reach 99.0%. This numerical study could serve for reactor scale-up and system optimization of SCWPO with auto-thermal operation.

Suggested Citation

  • Bei, Lijing & Ge, Zhiwei & Ren, Changyifan & Su, Di & Shang, Fei & Wang, Yu & Guo, Liejin, 2023. "Numerical study on supercritical water partial oxidation of ethanol with auto-thermal operation," Energy, Elsevier, vol. 264(C).
    • Handle: RePEc:eee:energy:v:264:y:2023:i:c:s0360544222031838
    DOI: 10.1016/j.energy.2022.126297
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    References listed on IDEAS

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    1. Bei, Lijing & Ge, Zhiwei & Ren, Changyifan & Su, Di & Ren, Zhenhua & Guo, Liejin, 2022. "Numerical study on supercritical water partial oxidation of ethanol in a continuous reactor," Energy, Elsevier, vol. 249(C).
    2. Cao, Changqing & Xie, Yupeng & Mao, Liuhao & Wei, Wenwen & Shi, Jinwen & Jin, Hui, 2020. "Hydrogen production from supercritical water gasification of soda black liquor with various metal oxides," Renewable Energy, Elsevier, vol. 157(C), pages 24-32.
    3. Ruya, Petric Marc & Lim, Siew Shee & Purwadi, Ronny & Zunita, Megawati, 2020. "Sustainable hydrogen production from oil palm derived wastes through autothermal operation of supercritical water gasification system," Energy, Elsevier, vol. 208(C).
    4. Özdenkçi, Karhan & Prestipino, Mauro & Björklund-Sänkiaho, Margareta & Galvagno, Antonio & De Blasio, Cataldo, 2020. "Alternative energy valorization routes of black liquor by stepwise supercritical water gasification: Effect of process parameters on hydrogen yield and energy efficiency," Renewable and Sustainable Energy Reviews, Elsevier, vol. 134(C).
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