화학공학소재연구정보센터
홈 로그인 로그아웃 연락처 사이트맵
Journal of the Korean Industrial and Engineering Chemistry, Vol.15, No.7, 797-802, November, 2004
Export Citation
기체-액체-액체-고체 유동층에서 열전달 특성
Heat Transfer Characteristics in Gas-Liquid-Liquid-Solid Fluidized Beds
김준식†, 송상훈, 이상봉, 최명재, 고명환1, 강용2
  • 한국화학연구원 환경자원팀, 대전 305-600
  • 1청양대학 환경보건과, 청양 345-702
  • 2충남대학교 화학공학과, 대전 305-764
Jun-Sik Kim†, Sang-Hoon Song, Sang-Bong Lee, Myoung-Jae Choi, Nyoung-Han Ko1, and Yong Kang2
  • Advanced Chemical Technology Division-ENR, Korea Research Institute of Chemical Technology, Daejeon 305-600, Korea
  • 1Department of Environmental Health Sicence, Cheongyang College, Cheongyang 345-702, Korea
  • 2Department of Chemical Engineering, Chungnam National University, Daejeon 305-764, Korea
E-mail:
초록
기체-액체-액체-고체 유동층(직경 0.102 m X 높이 2.5 m)에서 열전달계수에 대한 기상(공기)의 유속 및 분산액상(등유)과 연속액상(물)의 유속, 유동입자(유리구슬)의 크기의 영향을 검토하였다. 기체-액체-고체 유동층에서 열전달계수는 기상 및 분산액상 유속의 증가에 따라 증가하였으며 연속액상의 유속과 층 공극률이 증가함에 따라 최대값을 나타내었다. 열전달계수는 유동입자의 크기가 증가함에 따라 현격히 증가하였으며 유동입자의 크기가 비교적 큰 경우(dp ≥ 3.0 mm)에 높은 열전달계수를 나타내었다. 기체-액체-액체-고체 유동층에서 내부열원과 유동층간의 열전달계수를 운전변수와의 상관식으로 나타내었고 또한, 수정된 무차원군인 Nusselt 수에 대한 Reynolds 수와 Prandtl 수의 상관식으로 잘 나타낼 수 있었다.
Effects of velocities of gas (Ug), dispersed and continuous liquid phases (Ud and Uc) and particle size (dp) on heat transfer coefficient (h) in gas-liquid-liquid-solid fluidized beds (0.102 I.D. 2.5m in height) have been determined. It has been found that the heat transfer coefficient was increased with increasing Ug or Ud. It has exhibited the local maximum with increasing the Uc and bed porosity (ε). The heat transfer coefficient was remarkably increased with dp and attained high values in the presence of relatively large particle size (dp ≥ 3.0 mm). The heat transfer coefficient between the immersed heater and the column proper has been correlated with operating variables (Ug, Ud, Uc and dp) and modified Nusselt number also well correlated with Reynolds number and Prandtle number.
Keywords:bed porosity;dispersed phase;gas-liquid-liquid;fluidized bed;heat transfer
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