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Theoretical and numerical analysis on pressure recovery of supersonic separators for natural gas dehydration

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  • Yang, Yan
  • Wen, Chuang
  • Wang, Shuli
  • Feng, Yuqing

Abstract

The supersonic separation is a novel technology in the natural gas dehydration for its compact design and fewer emissions. The other fascinating advantage is that the diffuser can convert kinetic energy into pressure energy to improve the energy efficiency. The mechanism of the pressure recovery is not well understood for the various flow conditions in supersonic velocities. The maximum pressure recovery coefficient (PRC) was estimated in theory and a theoretical equation was obtained with the ideal gas assumption. The theoretical results indicated that the PRC depended on the gas adiabatic exponent and Mach number in the upstream of the shock wave. A computational fluid dynamics model was developed to evaluate the gas dynamic parameters with various Mach numbers and their effects on the PRC. We found that a higher adiabatic exponent induced a larger PRC when the gas Mach number is more than 1.3. The PRC declined with the increase of the Mach number in the upstream of the shock wave both in the theoretical and numerical predictions. The numerical results are smaller than the ideal data with the maximum error of about 8.69% in the whole computed gas Mach number from 1.15 to 1.87. These results have suggested that the derived theoretical equation can be employed to estimate the PRC in the supersonic separation process to improve the design efficiency.

Suggested Citation

  • Yang, Yan & Wen, Chuang & Wang, Shuli & Feng, Yuqing, 2014. "Theoretical and numerical analysis on pressure recovery of supersonic separators for natural gas dehydration," Applied Energy, Elsevier, vol. 132(C), pages 248-253.
    • Handle: RePEc:eee:appene:v:132:y:2014:i:c:p:248-253
    DOI: 10.1016/j.apenergy.2014.07.018
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    1. Shooshtari, S.H. Rajaee & Shahsavand, A., 2017. "Maximization of energy recovery inside supersonic separator in the presence of condensation and normal shock wave," Energy, Elsevier, vol. 120(C), pages 153-163.
    2. Xiong, Yaxuan & An, Shuo & Xu, Peng & Ding, Yulong & Li, Chuan & Zhang, Qunli & Chen, Hongbing, 2018. "A novel expander-depending natural gas pressure regulation configuration: Performance analysis," Applied Energy, Elsevier, vol. 220(C), pages 21-35.
    3. Zhenya Duan & Zhiwei Ma & Ying Guo & Junmei Zhang & Shujie Sun & Longhui Liang, 2020. "Study on Supersonic Dehydration Efficiency of High Pressure Natural Gas," Sustainability, MDPI, vol. 12(2), pages 1-15, January.
    4. Bian, Jiang & Cao, Xuewen & Yang, Wen & Edem, Mawugbe Ayivi & Yin, Pengbo & Jiang, Wenming, 2018. "Supersonic liquefaction properties of natural gas in the Laval nozzle," Energy, Elsevier, vol. 159(C), pages 706-715.
    5. Wen, Chuang & Karvounis, Nikolas & Walther, Jens Honore & Yan, Yuying & Feng, Yuqing & Yang, Yan, 2019. "An efficient approach to separate CO2 using supersonic flows for carbon capture and storage," Applied Energy, Elsevier, vol. 238(C), pages 311-319.
    6. Liu, Yang & Cao, Xuewen & Guo, Dan & Cao, Hengguang & Bian, Jiang, 2023. "Influence of shock wave/boundary layer interaction on condensation flow and energy recovery in supersonic nozzle," Energy, Elsevier, vol. 263(PA).

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