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Sophisticated interplay of operating conditions governs flow field transition and optimal conversion inside tangentially fired gasifiers

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  • Sahu, Nitesh Kumar
  • Kumar, Mayank
  • Dewan, Anupam

Abstract

A computational model is developed to simulate reacting environment inside the pilot-scale, tangentially-fired, Mitsubishi Heavy Industry entrained-flow coal gasifier. Using this comprehensive model, the impact of three operating parameters, namely, swirl number (SN), reactor pressure and mass throughput on the gasifier flow field and coal gasification process is investigated. We demonstrate that for given values of any two of these parameters, it requires a threshold value of the third parameter to form the central recirculation zone (CRZ), the absence of which lowers char conversion. Therefore, a modified SN incorporating the combined effect of conventional SN, reactor pressure and mass throughput on the onset of CRZ formation is proposed for tangentially-fired gasifiers. Furthermore, the impact of variation in reactor pressure and mass throughput on char conversion is shown to be mediated through the corresponding change in particle residence time and pressure effect on kinetics. The results demonstrate that the operating parameters interact in a complex state space that governs the gasifier flow physics and optimal operation.

Suggested Citation

  • Sahu, Nitesh Kumar & Kumar, Mayank & Dewan, Anupam, 2022. "Sophisticated interplay of operating conditions governs flow field transition and optimal conversion inside tangentially fired gasifiers," Energy, Elsevier, vol. 252(C).
    • Handle: RePEc:eee:energy:v:252:y:2022:i:c:s0360544222008787
    DOI: 10.1016/j.energy.2022.123975
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    1. Fang, Neng & Li, Zhengqi & Xie, Cheng & Liu, Shuxuan & Lu, Yue & Zeng, Lingyan & Chen, Zhichao, 2021. "Influence of the multi-burner bias angle on the air/particle flow characteristics in an improved fly ash entrained-flow gasifier," Energy, Elsevier, vol. 234(C).
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    3. Duan, Liqiang & Sun, Siyu & Yue, Long & Qu, Wanjun & Yang, Yongping, 2015. "Study on a new IGCC (Integrated Gasification Combined Cycle) system with CO2 capture by integrating MCFC (Molten Carbonate Fuel Cell)," Energy, Elsevier, vol. 87(C), pages 490-503.
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