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Thermal and flow characteristics of a cylindrical superheated steam generator with helical fins

Author

Listed:
  • Bang, You-Ma
  • Cho, Chong Pyo
  • Jung, Yongjin
  • Park, Seong-Ryong
  • Kim, Joeng-Geun
  • Park, Sungwook

Abstract

Helical fins including the downward (−30°), flat (0°), and upward (15°, 30°, 45°) fins were applied to the inner wall of a high temperature steam generator (HTSG) in the same direction as superheated steam flowing in the HTSG, to improve heat transfer performance. The flow inside the HTSG and the temperature change were analyzed using numerical analysis. Without a fin, the numerical analysis results showed a difference of up to 11.6% for superheated steam and 5.1% for hot gas compared with the actual experimental temperature readings. When steam was introduced into the HTSG, a secondary vortex flow was generated around it, along with a descending swirl flow and the application of helical fins inhibited downward flow and increased the time that the steam received heat from the superheater. In addition, the upward type fin prevented the escape of the superheated steam from the upper surface of the fin better than the downward type fin, in which the curved surface of the fin faces downward of the HTSG. The secondary flow occurred between the HTSG wall and the fins, which contributed to the improved of heat transfer. The highest temperature of steam discharge was at an upward fin angle of 15°.

Suggested Citation

  • Bang, You-Ma & Cho, Chong Pyo & Jung, Yongjin & Park, Seong-Ryong & Kim, Joeng-Geun & Park, Sungwook, 2023. "Thermal and flow characteristics of a cylindrical superheated steam generator with helical fins," Energy, Elsevier, vol. 267(C).
    • Handle: RePEc:eee:energy:v:267:y:2023:i:c:s0360544222034867
    DOI: 10.1016/j.energy.2022.126599
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    References listed on IDEAS

    as
    1. Cho, Jaeyoung & Kim, Yongtae & Song, Jeongwoo & Lee, Tae Kyung & Song, Han Ho, 2018. "Design of dynamic plant model and model-based controller for a heat recovery system with a swirling flow incinerator," Energy, Elsevier, vol. 147(C), pages 1016-1029.
    2. Jeachul Jang & Sunhee Oh & Chongpyo Cho & Seong-Ryong Park, 2018. "Design and Experimental Study of HTSG for Waste to Energy: Analysis of Pressure Difference," Energies, MDPI, vol. 11(7), pages 1-14, July.
    3. Frick, Konor & Wendt, Daniel & Talbot, Paul & Rabiti, Cristian & Boardman, Richard, 2022. "Technoeconomic assessment of hydrogen cogeneration via high temperature steam electrolysis with a light-water reactor," Applied Energy, Elsevier, vol. 306(PB).
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