| 학회 |
한국화학공학회 |
| 학술대회 |
2004년 봄 (04/23 ~ 04/24, 공주대학교) |
| 권호 |
10권 1호, p.773 |
| 발표분야 |
유동층 |
| 제목 |
Study on gas-solid flow behavior in high-density circulating fluidized beds |
| 초록 |
Flow behavior, structures and flow regime were determined in a circulating fluidized bed riser (0.203 m i.d.×5.9 m high) of FCC particles (dp = 70 μm, ρs = 1700 kg/m3). A momentum probe was used to measure radial momentum flux profiles and to distinguish between local net upward and downward flow regions.Time-mean dynamic pressure decreases towards the wall and, the fast fluidization flow regime was observed to coexist with dense suspension upflow (DSU) in the range Ug = 5-8 m/s, Gs = 10-340 kg/m2s. The annular downflow layer disappears locally with increasing solids mass flux (Gs) at a constant Ug, with achievement of the DSU regime. New correlations are developed to predict the thickness of solids down-flowing layer based on solids mass flux and momentum flux. They account for the effect of height on the thickness, and cover high Gs ranges near the onset of the DSU regime. Also, a new flow regime map is proposed distinguishing the fast fluidization, DSU and dilute pneumatic transport flow regimes. |
| 저자 |
Sung Won Kim, Gorkem Kirbas, Hsiaotao Bi, C. Jim Lim, John R. Grace
|
| 소속 |
Univ. of British Columbia |
| 키워드 |
Circulating fluidized bed; Fast fluidization; Dense suspension upflow; Hydrodynamics; Annular downflow layer thickness; Flow regimes; Momentum probe
|
| E-Mail |
|
| 원문파일 |
초록 보기 |
