内循环流化床光催化反应器的数值模拟与结构优化

设计了一种新型三相内循环流化床光催化反应器并采用气、液两相模拟方法对其进行了结构优化.依据模拟结果,明确了挡板的位置、长度、底部曝气面积等因素对反应器流体行为的影响.结果表明,最优反应器升、降流区横截面积比为1:1,挡板距反应器底部的距离为0.175m,挡板顶部与沉降区底部持平,底部曝气面积为升流区面积的1.2倍.将该反应器进行三相数值模拟,模拟结果表明,固相催化剂在反应器内能够很好地流化,反应器内无明显的死区,其固液分界面低于气液分界面,沉降区能够发挥很好的固液分离效果.

Numerical simulation study of internal circulating fluidized bed photocatalytic reactor

A novel three-phase internal circulating fluidized bed photocatalytic reactor was developed and a gas-liquid two-phase model was used to optimize the structure of the reactor. The simulation results indicated that the position and the length of the plates, the size of aeration area had significant influence on the flow field of the reactor. The structure of the optimal reactor was that the riser cross-section area was equal to the downcomers cross-section area, the plates were kept at 0.175m above the bottom of the reactor, the top of the plates and the bottom of the settlement area had the same horizontal position, the aeration area and the riser area ratio was 1.2. In addition, a gas-liquid-solid three-phase model was established to calculate the flow field of the optimal reactor. The solid phase catalysts could be a very good fluidization. There was hardly any dead area in the reactor and the settlement area could display good subsidence effect on the solid phase catalysts.