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Effect of evaporation on the energy conversion of a supercritical water oxidation system containing a hydrothermal flame

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  • Zhang, Fengming
  • Li, Yufeng
  • Jia, Cuijie
  • Shen, Boya

Abstract

Hydrothermal flame is an effective solution to avoid coking and salt plugging in the preheating section of a supercritical water oxidation (SCWO) system with a transpiring wall reactor (TWR). An SCWO system with an evaporation module (SCWOE) is proposed in this work to concentrate the wastewater and promote the formation of a hydrothermal flame. The SCWOE system is simulated using Aspen Plus, and the simulation model is validated by comparing with the experimental data on the migration of organics in evaporation. The introduction of the evaporation module greatly reduces the exergy input. The exergy destruction mainly comes from the TWR, electric heater, and heat exchangers. The highest exergy destruction in the TWR appears in the reaction section, and the total exergy destruction in the TWR due to the transpiring water injection reaches 89.9%. The increase in concentration ratio (α) and feed concentration (ω) can lower the exergy input and improve the energy efficiency, and an energy self-sufficient rate of 79.7% occurs at ω = 15% and α = 2. Moreover, the involatile property of organics is conducive to improving energy self-sufficient rate, and the volatilization rate of phenol in wastewater must be controlled in this system.

Suggested Citation

  • Zhang, Fengming & Li, Yufeng & Jia, Cuijie & Shen, Boya, 2021. "Effect of evaporation on the energy conversion of a supercritical water oxidation system containing a hydrothermal flame," Energy, Elsevier, vol. 226(C).
    • Handle: RePEc:eee:energy:v:226:y:2021:i:c:s0360544221006551
    DOI: 10.1016/j.energy.2021.120406
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    References listed on IDEAS

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    1. Liu, Jia & Hu, Nan & Fan, Li-Wu, 2022. "Optimal design and thermodynamic analysis on the hydrogen oxidation reactor in a combined hydrogen production and power generation system based on coal gasification in supercritical water," Energy, Elsevier, vol. 238(PB).
    2. Huang, Yingfei & Zhang, Fengming & Liang, Zhaojian & Li, Yufeng & Wu, Tong, 2023. "Effect of hydrothermal flame generation methods on energy consumption and economic performance of supercritical water oxidation systems," Energy, Elsevier, vol. 266(C).
    3. Qiu, Yuxin & Liu, Yunyun & Zhang, Fengming & Rong, Weiqing, 2024. "Thermodynamic and exergy assessments of supercritical water gasification of oily sludge assisted by hydrothermal flame," Energy, Elsevier, vol. 296(C).

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