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Loop-seal flow characteristics of a circulating fluidized bed for 3 MWth scale chemical looping combustion system

Author

Listed:
  • Kim, Daewook
  • Won, Yooseob
  • Hwang, Byung Wook
  • Kim, Jae Young
  • Kim, Hana
  • Choi, Yujin
  • Lee, Yu-Ri
  • Lee, Seung-Yong
  • Jo, Sung-Ho
  • Park, Young Cheol
  • Baek, Jeom-In
  • Nam, Hyungseok
  • Lee, Doyeon
  • Ryu, Ho-Jung
  • Choi, Jeong-Hoo

Abstract

This study aimed to provide a design and operational approach for a loop-seal, which is the heart of a circulating fluidized bed (CFB). Thousands of CFB systems use this non-mechanical valve to optimize performance by controlling the solids circulation rate while preventing gas mixing between reactors. Nevertheless, its design and operating guidance remains unclear because of its intricate flow characteristics, causing confusion in design and operation of the entire CFB. This study experimentally investigated the three most important elements while designing and operating loop-seal: conditions for initiating solids flow, the maximum obtainable solids flow rate, and quantitative control of solids flow rate. Experiments were conducted in a CFB, which simulated 3 MWth chemical looping combustion (CLC) system that is currently being developed. The onset of solids flow occurs when the gas drag force in horizontal passage overcomes the resistance force generated by the bed of particles. The maximum solids circulation rate was determined by solids height in the supply chamber and pressure around CFB loop. A correlation for quantitative control of solids flow in loop-seal was proposed by the relationship between the gas drag force and particle velocity. Finally, operational conditions for the loop-seal in 3 MWth CLC were proposed.

Suggested Citation

  • Kim, Daewook & Won, Yooseob & Hwang, Byung Wook & Kim, Jae Young & Kim, Hana & Choi, Yujin & Lee, Yu-Ri & Lee, Seung-Yong & Jo, Sung-Ho & Park, Young Cheol & Baek, Jeom-In & Nam, Hyungseok & Lee, Doye, 2023. "Loop-seal flow characteristics of a circulating fluidized bed for 3 MWth scale chemical looping combustion system," Energy, Elsevier, vol. 274(C).
    • Handle: RePEc:eee:energy:v:274:y:2023:i:c:s0360544223006655
    DOI: 10.1016/j.energy.2023.127271
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    References listed on IDEAS

    as
    1. Basu, Prabir & Butler, James, 2009. "Studies on the operation of loop-seal in circulating fluidized bed boilers," Applied Energy, Elsevier, vol. 86(9), pages 1723-1731, September.
    2. Kim, Daewook & Jang, Jae Jun & Nam, Hyungseok & Kim, Jae Young & Won, Yooseob & Lee, Seung-Yong & Hwang, Byung Wook & Choi, Yujin & Kim, Hana & Baek, Jeom-In & Ryu, Ho-Jung, 2022. "Studies on the cyclone dipleg flow characteristics in a CFB for designing 3 MWth scale chemical looping combustor," Energy, Elsevier, vol. 253(C).
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    Cited by:

    1. Yubin Lin & Qinhui Wang & Chao Ye & Yao Zhu & Haojie Fan, 2023. "Experimental Research on the Gas-Solid Flow Characteristics in Large-Scale Dual Fluidized Bed Reactor," Energies, MDPI, vol. 16(21), pages 1-19, October.

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