上流式反应器中气体分散性能的研究

GAS-LIQUID DISPERSION PERFORMANCE IN AN UP-FLOW REACTOR

在冷模试验装置中,以带圆柱形上升管的多孔板气液分布器为对象,考察了表观气速、轴向高度、上升管直径、固体颗粒形状对气含率分布的影响。结果表明,该气液分布器产生的初始气泡尺寸较大,多为毫米级气泡;气速越大,轴向位置越高,局部气含率的径向分布越不均匀;上升管直径为26 mm的气液分布器的气体分散性能优于上升管直径为48 mm的气液分布器;球形、齿球形和三叶草形固体颗粒对气泡均有破碎作用,且三叶草形固体颗粒破碎效果优于球形固体颗粒,使用三叶草形固体颗粒的填料层上方气含率分布偏差最小。

The effect of apparent gas velocity,axial height,diameter of riser and shape of solid particles on gas holdup distribution was investigated in cold mold test equipment with perforated plate gas-liquid distributor with cylindrical riser.The results showed that the initial bubble size generated by the gas-liquid distributor was large,mostly millimeter-scale bubbles.The uniformity of the gas holdup distribution became worse with the increase of gas velocity and the axial height.The gas dispersion performance of the gas-liquid distributor with a riser diameter of 26 mm is better than the gas-liquid distributor with a riser diameter of 48 mm.The ceramic ball,tooth spherical and clover-shaped particle all had a breakup effect on the bubble,and the breakup effect of the clover-shaped particle is better than ceramic ball and tooth spherical particle.The unevenness distribution of gas hold above the filler layer using clover-shaped solid particles is the smallest.