Distribution of Solid Hold-Up in Exit Area of Riser with Combined Restraint Under Different Flow Regimes
1. School of Chemical Engineering, Hebei University of Technology, Tianjin 300130, China;
2. Engineering Research Center of Seawater Utilization Technology of Ministry of Education, Hebei University of Technology, Tianjin 300130, China
Abstract：A cold model of riser with combined restraint was established to study the distribution of local solid hold-up in exit area and the effect of different operating conditions under pneumatic transport and fast fluidization flowing regimes. Experimental results showed that the radial distribution of local solid hold-up was lower in the center region and higher in the wall region. The local solids hold-up increased with the decrease of superficial gas velocity and distributor opening rate, decreased with the decrease of solid flux and upper fluidized bed pressure drop. Under fast fluidization operating conditions, the distribution form of local solid hold-up was similar to that in the conventional riser. Under pneumatic transport operating conditions, the maximum local solid hold-up in exit area didn’t usually appear in the wall region. The maximum position was away from the wall with the increase of superficial gas velocity and distributor opening rate, the decrease of solid flux and upper fluidized bed pressure drop. Under the two flowing regimes, the radial uniformity of local solid hold-up increased with the increase of superficial gas velocity and distributor opening rate, decreased with the increase of solid flux and upper fluidized bed pressure drop.
Li Rui1,Wang Dewu1,Zhang Shaofeng1 et al. Distribution of Solid Hold-Up in Exit Area of Riser with Combined Restraint Under Different Flow Regimes[J]. 化学反应工程与工艺, 2015, 31(2): 97-105.
