서지주요정보
순환유동층에서의 축방향 고체체류량 분포 = Axial solid holdup distribution in a circulating fluidized bed
서명 / 저자 순환유동층에서의 축방향 고체체류량 분포 = Axial solid holdup distribution in a circulating fluidized bed / 남궁원.
저자명 남궁원 ; Namkung, Won
발행사항 [대전 : 한국과학기술원, 1993].
Online Access 원문보기 원문인쇄

소장정보

등록번호

8003859

소장위치/청구기호

학술문화관(문화관) 보존서고

MCHE 93007

SMS전송

도서상태

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반납예정일

초록정보

The effects of gas velocity, solids circulation rate and secondary air injection on the axial solid holdup distributions have been determined in a circulating fluidized bed (0.1 m-ID x 5.3 m high) of FCC particles ($d_p$ = 65 ㎛, $ρ_p$ = 1720 kg/㎥). The solid holdup in the riser increases with increasing solids circulation rate but decreases with increasing gas velocity. The axial solid holdup distribution has been found to be simple exponential function in the riser. The transition height ($Z_t$) defined as the height of the dense/dilute region interface can be determined from the kink point of the slopes of the axial solid holdup distribution since the solid holdup decreases exponentially with the riser height. These transition heights have been correlated with the pertinent dimensionless groups. The solid holdup in the dense regione increases with increasing solids circulation rate at lower gas velocities, whereas it is independent of solids circulation rate at higher gas velocities. The solid holdup in e dilute regione increases linearly with increasing solids circulation rate and decreases with increasing gas velocity. The solid holdup in the region below the secondary air injection point increases with increasing secondary air injection ratio (0-50 %). However, the solid holdup in the region above the secondary air injection point slightly decreases with increasing secondary air injection ratio. Therefore, the gradient of solid holdup distribution increases with increasing secondary air ratio. The total solid holdup in the riser increases with increasing the height of secondary air injection, and the radial or tangential injection type of secondary air has no significant effects on the solid holdup distribution.

서지기타정보

서지기타정보
청구기호 {MCHE 93007
형태사항 viii, 103 p. : 삽도 ; 26 cm
언어 한국어
일반주기 부록 : A-1, Calibration curve. - A-2, 상온순환유동층 설계. - A-3, Experiment data
저자명의 영문표기 : Won Namkung
지도교수의 한글표기 : 김상돈
지도교수의 영문표기 : Sang-Done Kim
학위논문 학위논문(석사) - 한국과학기술원 : 화학공학과,
서지주기 참고문헌 : p. 82-88
주제 Fluidization.
Hydrodynamics.
유동층. --과학기술용어시소러스
수력학. --과학기술용어시소러스
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