Axial Distribution of Averaged Cross-sectional Solids Hold-up in an Annulus Fluidized Bed-Riser Coupled Reactor
WANG Zi-jian E Cheng-lin HUANG Shi-ping LU Chun-xi
College of Chemical Engineering, China University of Petroleum(Beijing) State Key Laboratory of Heavy Oil, China University of Petroleum (Beijing) State Key Laboratory of Heavy Oil Processing China University of Petroleum(Beijing) State Key Laboratory of Heavy Oil, China University of Petroleum (Beijing)
Abstract：The axial distribution of solids hold-up in a large scale cold model annulus fluidized bed-riser coupled reactor was studied. The results showed that in the fluidized bed zone, the averaged cross-sectional solids hold-up ( ) decreased with increasing of superficial gas velocity. The riser zone could be divided into two zones, fully developed zone (3.91~6.81 m) and back-mixing zone (6.81~8.60 m), increased with increasing of superficial gas velocity. When the gas velocity was less than 0.7 m/s, the distribution of was uniform, when the gas velocity was greater than 0.7 m/s, in back-mixing zone increased. In the annulus discharging duct, under the influence of gas bypass, the flow was concurrent with the gravity field with increasing of fluid resistance. When the gas velocity was less than 0.75 m/s, the distribution of was uniform, when the gas velocity was greater than 0.75 m/s, disengaging occurred in the cone-shaped sections. On the whole, the distribution of in the annulus discharging duct was uniform, increased slightly with decreasing of height of the annulus discharging. The particles could complete the circular flow back into the fluidized bed through the annulus discharging duct smoothly. Furthermore, the empirical models for estimating the axial distribution of were established based on experimental data, which were in good agreement with the experimental data.
王子健 鄂承林 黄世平 卢春喜. 环隙下料式流化床-提升管耦合反应器内截面平均固含率的分布[J]. 过程工程学报, 2016, 16(2): 210-215.
WANG Zi-jian E Cheng-lin HUANG Shi-ping LU Chun-xi. Axial Distribution of Averaged Cross-sectional Solids Hold-up in an Annulus Fluidized Bed-Riser Coupled Reactor. Chin. J. Process Eng., 2016, 16(2): 210-215.
2016, Vol. 16 
