微型流化床反应器液相冷态进样停留时间分布模拟与实验

为了得出气、液相流量变化对微型流化床反应器液相停留时间的影响规律,借助Fluent软件对反应器内部流场进行数值模拟,得到其速度、压力分布特性和反应器出口液相浓度的变化曲线。采用示踪剂侧面脉冲进样法,实验测定了反应器中液相的停留时间分布。结果表明,气相流量和液相流量均对液相停留时间有明显的影响,气、液相流量为4¹0L/h时,液相平均停留时间可以控制在1.1110L/h时,液相平均停留时间可以控制在1.11¹.89s;气、液相流量的增加均会导致液相停留时间的减少,但气相流量对停留时间的影响要大于液相流量对液相停留时间的影响。数值模拟与实验数据对比分析发现二者结果吻合良好,模型可用。

Simulation and Experiment on Residence Time Distribution of Liquid Phase Cold-state Injection in Micro-fluidized Bed Reactor

In order to find the influence of gas and liquid flow rates on residence time in a small fluidized-bed reactor, the Fluent was employed to simulate inner flow field so that the distribution character of static pressure and axial velocity and the concentration at the exit can be reached. The tracer agent side pulse injection meth- od was used in the experiment to determine residence time distribution （RTD） of liquid in the reactor, the re- suits show that the average residence time can be controlled at 1.11 - 1.89s when the gas and liquid flow rate is set at 4 - 10L/h; and both increased gas and liquid flow rate can reduce the residence time, and the influ- ence of gas flow rate on the residence time is greater than the liquid flow rate＇ The numerical simulation which agrees well with the experimental data proves the model applicability.