The effects of funnel-shape internals on hydrodynamics and mass transfer in an internal loop three-phase fluidized bed were investigated.Three different kinds of internals were designed which were setup on the top of ...The effects of funnel-shape internals on hydrodynamics and mass transfer in an internal loop three-phase fluidized bed were investigated.Three different kinds of internals were designed which were setup on the top of draft-tube in terms of horizontal angle and outer diameter, and gas hold up, liquid mixing time, liquid circulation velocity and mass transfer coefficient were measured respectively.It was shown that the riser gas holdup and mass transfer coefficient increased by 10% and 15% than that without such an internal, liquid mixing time decreased by 10% to 25%.When the superficial gas velocity was less than 0.5 cm·s-1, liquid circulation velocity increased with the setup of such internals·Liquid circulation velocity decreased when the superficial gas velocity was above 0.5 cm·s-1.In addition, the variation of structural parameters of funnel-shape internals had significant effects on hydrodynamics and mass transfer.展开更多
本文通过对气含率εg、液缝速度 u1,液涡分布εw、气泡分布密度 f、床内压力 p 等性质在床内变化规律的综合分析,指出按气泡汇合和破碎性质,在径向上,初步分为三个区:气泡汇合区;气泡破碎区;边界区。同时,分析了三相流化床内压力沿径向...本文通过对气含率εg、液缝速度 u1,液涡分布εw、气泡分布密度 f、床内压力 p 等性质在床内变化规律的综合分析,指出按气泡汇合和破碎性质,在径向上,初步分为三个区:气泡汇合区;气泡破碎区;边界区。同时,分析了三相流化床内压力沿径向的变化,并进行了定性验证。展开更多
文摘The effects of funnel-shape internals on hydrodynamics and mass transfer in an internal loop three-phase fluidized bed were investigated.Three different kinds of internals were designed which were setup on the top of draft-tube in terms of horizontal angle and outer diameter, and gas hold up, liquid mixing time, liquid circulation velocity and mass transfer coefficient were measured respectively.It was shown that the riser gas holdup and mass transfer coefficient increased by 10% and 15% than that without such an internal, liquid mixing time decreased by 10% to 25%.When the superficial gas velocity was less than 0.5 cm·s-1, liquid circulation velocity increased with the setup of such internals·Liquid circulation velocity decreased when the superficial gas velocity was above 0.5 cm·s-1.In addition, the variation of structural parameters of funnel-shape internals had significant effects on hydrodynamics and mass transfer.
