摘要
The flow behavior of gas and solid was investigated in FCC simulator of φ710×4000/φ870×11000mm.The axial and radial distributions were detected with matrix fiber-opticprobes.It was found that the distribution of bubble diameter in the turbulent region of the fluidizedbed of fine particles was different from the results reported for lab-scale experiments.Radially therewere three areas,i.e.,the central(r/R=0-0.4),the intermittent or stable(r/R=0.4-0.8)and thenear wall(r/R=0.8-1.0)areas respectively.It was noticed that bubbles were almost non-existing atthe near wall area.Hence,according to the coalescence and splitting theory of bubbles,a two-areamodel of bubble diameter distribution was proposed and a dimensionless parameter(γ_M)regarded asan index for’quality’of fluidization was deduced.
The flow behavior of gas and solid was investigated in FCC simulator of Φ710×4000/ΦP870 × 11000mm. The axial and radial distributions were detected with matrix fiber-optic probes. It was found that the distribution of bubble diameter in the turbulent region of the fluidized bed of fine particles was different from the results reported for lab-scale experiments. Radially there were three areas, i.e., the central (r/R = 0—0.4), the intermittent or stable (r/R = 0.4—0.8) and the near wall (r/R = 0.8—1.0) areas respectively. It was noticed that bubbles were almost non-existing at the near wall area. Hence, according to the coalescence and splitting theory of bubbles, a two-area model of bubble diameter distribution was proposed and a dimensionless parameter (γM) regarded as an index for 'quality' of fluidization was deduced.
