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Thermodynamic analysis of a semi-lean solution process for energy saving via rectisol wash technology

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  • Yang, Sheng
  • Zhang, Lu
  • Xie, Nan
  • Gu, Zhaohui
  • Liu, Zhiqiang

Abstract

Currently, it is of great significance to develop energy-saving technologies. Rectisol wash technology is becoming more and more popular in the industrial field due to its excellent performance. In order to reduce the energy consumption, a semi-lean solution process based on the Rectisol wash technology is proposed in this paper. The Cubic-Plus-Association (CPA) and Predictive Soave–Redlich–Kwong (PSRK) property methods are selected for the simulations in Aspen Plus. Two scenarios are proposed for the energy and exergy analysis. Results show that 50% SP3-reflux ratio is the optimal point in both scenarios from the energy view, and the optimal SP3-reflux ratios for scenario 1 and scenario 2 are 40% and 43% from the exergy view, respectively. In addition, the analysis results of related parameters in both scenarios show that increasing the SP1-spitting ratio or decreasing the SP2-spitting ratio has a positive effect on CO2 production; the H2S concentration in CO2 product first increases and then decreases while either ratio increases. The stripping N2 flowrate has a significant impact on the H2S concentration in Claus gas. This paper may guide for further study of the semi-lean solution process and provide a better understanding for Rectisol technology.

Suggested Citation

  • Yang, Sheng & Zhang, Lu & Xie, Nan & Gu, Zhaohui & Liu, Zhiqiang, 2021. "Thermodynamic analysis of a semi-lean solution process for energy saving via rectisol wash technology," Energy, Elsevier, vol. 226(C).
    • Handle: RePEc:eee:energy:v:226:y:2021:i:c:s0360544221006514
    DOI: 10.1016/j.energy.2021.120402
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