Transactions of the Korean Society of Mechanical Engineers B (대한기계학회논문집B)

The Korean Society of Mechanical Engineers (대한기계학회)
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Numerical Calculations on Flow and Behavior of Pulverized Coal and Ash Particles in 2-Stage Entrained-Flow Gasifier

2단 분류층 석탄가스화기 내의 열유동 및 미분탄/재 입자거동 계산

  • 황정호 (연세대학교 기계공학과) ;
  • 박선호 (연세대학교 대학원 기계공학과) ;
  • 정진도 (호서대학교 환경공학과)
  • Published : 2001.07.01
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Abstract

Flow fields, temperature distributions, and particle trajectories in a 2-stage entrained-flow gasifier are calculated using a CFD code, FLUENT. Realizable k-$\xi$ model is used as a turbulent model. Because of swirling flow there appear recirculation regions near the burners. The characteristics of flow fields and temperature distributions in the gasifier are dependent on the swirl number of the system. Mean residence time of the particles in the reductor is inversely proportional to particle size, particle density and swirl number. As the swirl number is increasing, the particles injected from the combustor burners approach the wall near the combustor burners, which prevents the particles from entering the reductor and thus attatching the reductor wall. If the lower combustor burner angle is larger than the higher combustor burner angle for a given swirl number, the particles may move toward the reductor and cause ash/slag deposition problem.

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References

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