外混合喷嘴液相孔尺寸对雾化性能的影响

Effect of liquid-phase pore sizes on the spraying performance varied in outside-atomization nozzles

借助"冷模"实验,以甲醇制丙烯(MTP)反应器外混合式雾化喷嘴为研究对象,分别选用N_2和H_2O为实验模拟介质,考察了液相孔结构与气液质量流量比(G/L)对雾化粒径分布、雾化角和雾化覆盖直径的影响规律。实验结果表明,当G/L=12.19、截面积比为0.022 3时,雾滴对应特征中值直径和最大直径分别为16.75μm和60.81μm,雾滴粒径分布介于5.49～40.89μm之间,雾化角达12.2°;且覆盖直径随着截面积比增大而略有增加,当液相通道内径为1.0 mm、液相环隙通道外径为12.22 mm和气相环隙通道内径为13.34 mm时,喷嘴对应覆盖直径达720 mm。

The atomization performances of outside-atomization nozzles used in methanol-topropylene( MTP) reactor were investigated by “cold model” experiments. The effect rules of the different liquid-phase pore diameter sizes and gas-liquid mass flow ratios(G/L) on atomization particle size distributions,atomizing angles and droplet-covered diameter were also investigated. The experiment results showed that mean mass diameter and max mass diameter were 16.75 μm and 60.81 μm respectively,corresponding particle size distribution was between 5.49 μm and 40.89 μm,and atomizing angle was 12.2° while G/L maintained 12.19 and cross-section area ratios equaled to 0.022 3. Furthermore,droplet-covered diameter of the nozzle increased slightly with the increase of the cross-section area ratios,and it could reached 720 mm while liquid-phase pore inside diameter was 1.0 mm,aperture gaps of liquid-phase outside diameter was 12.22 mm and aperture gaps of gas-phase inside diameter was 13.34 mm.