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A novel steam ejector with pressure regulation to optimize the entrained flow passage for performance improvement in MED-TVC desalination system

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  • Tang, Yongzhi
  • Liu, Zhongliang
  • Shi, Can
  • Li, Yanxia

Abstract

Steam ejector plays a critical role in MED-TVC desalination system that can achieve a good balance between freshwater production and energy savings. In this study, a pressure regulation technology is proposed to optimize the entrained flow passage and thus improve the ejector performance. The theoretical basis is that there have some existing low-pressure potentials inside the ejector that can be used to alleviate the high-pressure effect and shock wave at the mixing chamber end. Then the feasibility verification and performance comparison of different pressure regulation schemes is implemented systematically. Analysis and research mainly pay attention to the influences of pressure regulations on the mass flow rate, the entrainment ratio and internal flow field. The results reveal that there is an optimum combination of pressure regulation schemes, by which a most considerable entrainment ratio improvement could be achieved, as large as 11.77% within the simulated conditions, and with 3.94% even under the design condition. More specifically, for the given steam ejector, TMCE pressure regulation could be used if the ejector operates under the design condition. For the off-design conditions, CMCE pressure regulation is the best choice if the back pressure is larger than 34 kPa, otherwise DMCE pressure regulation should be chosen.

Suggested Citation

  • Tang, Yongzhi & Liu, Zhongliang & Shi, Can & Li, Yanxia, 2018. "A novel steam ejector with pressure regulation to optimize the entrained flow passage for performance improvement in MED-TVC desalination system," Energy, Elsevier, vol. 158(C), pages 305-316.
    • Handle: RePEc:eee:energy:v:158:y:2018:i:c:p:305-316
    DOI: 10.1016/j.energy.2018.06.028
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    2. Tang, Yongzhi & Liu, Zhongliang & Li, Yanxia & Shi, Can & Lv, Chen, 2019. "A combined pressure regulation technology with multi-optimization of the entrainment passage for performance improvement of the steam ejector in MED-TVC desalination system," Energy, Elsevier, vol. 175(C), pages 46-57.
    3. Bian, Jiang & Cao, Xuewen & Yang, Wen & Song, Xiaodan & Xiang, Chengcheng & Gao, Song, 2019. "Condensation characteristics of natural gas in the supersonic liquefaction process," Energy, Elsevier, vol. 168(C), pages 99-110.
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    9. Yang, Yan & Zhu, Xiaowei & Yan, Yuying & Ding, Hongbing & Wen, Chuang, 2019. "Performance of supersonic steam ejectors considering the nonequilibrium condensation phenomenon for efficient energy utilisation," Applied Energy, Elsevier, vol. 242(C), pages 157-167.
    10. Besagni, Giorgio, 2019. "Ejectors on the cutting edge: The past, the present and the perspective," Energy, Elsevier, vol. 170(C), pages 998-1003.
    11. Tang, Yongzhi & Liu, Zhongliang & Li, Yanxia & Huang, Zhifeng & Chua, Kian Jon, 2021. "Study on fundamental link between mixing efficiency and entrainment performance of a steam ejector," Energy, Elsevier, vol. 215(PB).
    12. Tashtoush, Bourhan M. & Al-Nimr, Moh'd A. & Khasawneh, Mohammad A., 2019. "A comprehensive review of ejector design, performance, and applications," Applied Energy, Elsevier, vol. 240(C), pages 138-172.
    13. Wen, Chuang & Gong, Liang & Ding, Hongbing & Yang, Yan, 2020. "Steam ejector performance considering phase transition for multi-effect distillation with thermal vapour compression (MED-TVC) desalination system," Applied Energy, Elsevier, vol. 279(C).

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