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삼상 순환 유동층 생물반응기에서 열전달 계수

Heat Transfer Coefficient in a Three-Phase Circulating Fluidized-Bed Bioreactor

강태규 송평섭 최길수 조용준¹ 강용^† 최호석 김상동²

Tae-Gyu Kang Pyung-Seob Song Gill-Soo Choi Yong-Jun Cho¹ Yong Kang^† Ho-Suk Choi Sang-Done Kim²

충남대학교 화학공학과, 대전 305-764 ¹한국원자력연구소 핵화공연구팀, 대전 305-353 ²한국과학기술원 화학공학과, 대전 305-701

Department of Chemical Engineering, Chungnam National University, Daejeon 305-764, Korea ¹Nuclear Chemical Research Team, Korea Atomic Energy Research Institute, Daejeon 305-353, Korea ²Department of Chemical Engineering, Korea Advanced Institute of Science and Technology, Daejeon 305-701, Korea

HWAHAK KONGHAK, October 2002, 40(5), 640-645(6), NONE

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Abstract

직경이 0.102 m이고 높이가 1.0 m인 기체-액체 순환 및 삼상 순환유동층 생물반응기의 상승관에서 열전달 특성을 고찰하였다. 기체 및 액체의 유속 그리고 생물막 담체의 체류량이 상승관 내부의 수직 열원과 반응기 사이의 열전달 계수에 미치는 영향을 결정하였다. 기체-액체 순환 반응기에서 열전달 계수는 기체의 유속이 증가함에 따라 증가하였으나 액체 유속의 증가에 따라서는 약간 증가하였다. 삼상 순환유동층 생물반응기에서 열전달 계수는 기체의 유속과 유동 생물막 매체의 체류량이 증가함에 따라 증가하였으나 액체의 유속이 증가함에 따라서는 약간 증가하였다. 본 연구의 실험 범위에서 이들 열전달 계수는 실험 조작 변수의 상관식으로 잘 나타낼 수 있었다.

Heat transfer characteristics have been investigated in the riser of gas-liquid circulation and three-phase circulating fluidized-bed bioreactors whose diameter and height are 0.102 m and 1.0 m, respectively. Effects of gas and liquid velocities and holdup of fluidized biofilm media on the heat transfer coefficient between the immersed vertical heater and the bed have been determined. The heat transfer coefficient in the gas-liquid circulation reactor increases with increasing gas velocity, but increases only slightly with increasing liquid velocity. The h(heat transfer coefficient) value in the three-phase circulating fluidized-bed bioreactor also increases with increasing gas velocity or holdup of fluidized biofilm media, but it increases only slightly with liquid velocity. The value of heat transfer coefficient has been well correlated in terms of operating variables.

Keywords

Heat Transfer Coefficient Gas-Liquid Circulation Three-Phase Circulating Fluidized Bed Bioreactor

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