화학공학소재연구정보센터
홈 로그인 로그아웃 연락처 사이트맵
Journal of the Korean Industrial and Engineering Chemistry, Vol.14, No.4, 475-480, June, 2003
Export Citation
가압유동층에서 수평전열관의 국부열전달 특성
Local Heat Transfer Characteristics of the Horizontal Tube in a Pressurized Fluidized Bed
강석환, 강용†, 진경태1, 이창근1, 한근희1
  • 충남대학교 화학공학과, 충남
  • 1한국에너지기술연구원 청정에너지연구부
Suk-Hwan Kang, Yong Kang†, Gyoung-Tae Jin1, Chang-Gun Yi1, and Kun-Hee Han1
  • Department of Chemical Engineering, Chungnam National University, Chungnam, Korea
  • 1Clean Energy Research Department, KIER, Korea
E-mail:
초록
상온의 가압유동층에서 수평 전열관과 유동층간의 국부 및 총괄열전달 특성을 연구하였다. 조업 변수는 입자의 크기(0.18 ~ 0.85 nm), 유동화속도(Ug/Umf=1.25 ~ 2.0) 그리고 유동층 압력(0.1 ~ 0.8 MPa) 등이 수평전열관의 국부열전달계수에 미치는 영향을 검토하였다. 그 결과 유동층영역 내 수평전열관의 국부열전달계수는 전열관의 측면(90°)에서 가장 높은 값을 얻었으며, 전열관의 상부(0°)에서는 비유동 정제층이 존재하여 상대적으로 낮은 열전달계수 값을 나타내었다. 총괄열전달계수는 유동화속도와 압력의 증가에 따라 증가하였지만, 입자의 크기가 커지면 총괄열전달계수는 감소하였다. 또한 가압유동층에서 총괄열전달계수는 조업변수의 함수에 의한 무차원군의 상관관계식으로 도출되었다.
Local and overall heat transfer characteristics between the horizontal tube and the fluidized-bed have been investigated in a cold pressurized fluidized bed. Effects of particle size (0.18 ~ 0.85 nm), fluidizing velocity (Ug/Umf=1.25 ~ 2.0) and pressure (0.1 ~ 0.8 MPa) on the local heat transfer coefficient have been examined. The local heat transfer coefficient has exhibited highest value at the side of the horizontal tube (90°) while the value at the upper region of the tube (0°) has shown a relatively lower value because the stagnation zone that exist at the region. The overall heat transfer coefficient has increased with increasing fluidizing gas velocity and pressure while it has decreased with increasing particle size. The overall heat transfer coefficients in a pressurized fluidized bed have been correlated in terms of dimensionless groups.
Keywords:pressurized;fluidized bed;horizontal heater;local heat transfer coefficient
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