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      • G발표장 : 유동층1 ; G-14 : Study on gas-solid flow behavior in high-density circulating fluidized beds

        ( Sung Won Kim ),( Gorkem Kirbas ),( Hsiaotao Bi ) 한국화학공학회 2007 화학공학의이론과응용 Vol.10 No.1

        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.

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