【摘要】 针对旋流式催化裂化进料喷嘴进行了实验研究和数值模拟。实验中测量了不同工况下的雾化粒径和喷嘴的雾化角,同时验证了各段的压降分配方案。通过VOF(volume of fluid)方法对喷嘴气液两相流的流动过程进行了数值模拟,描述了喷嘴中两相流的填充过程,得到了喷嘴的压力、速度分布和雾化角,并与实验结果进行了比较,二者吻合较好。对上述结果分析后表明,该型旋流式喷嘴雾化粒径在53~60μm,雾化角随气液比或流量的增大而有所增加,采用内外嵌套式旋流器可使射流厚度较为均匀。更多还原

【Abstract】 Experiments on and numerical simulation of a swirl fluid catalytic cracking( FCC) feed nozzle were presented. In the experiments,the spray angle and sauter mean droplet( SMD) were measured at different flow rates. Then pressure drop on each section of nozzle was verified. Volume of Fluid( VOF) method was used to simulate the gas-liquid flow process in a swirl FCC feed nozzle. The simulation exhibited the process of two-phase flow filling feed nozzle. The nozzle pressure,velocity distribution and spray angle were calculated; the calculated results agreed well with validated by experimental data. The results show that: the SMD size of feed nozzle is 53-60μm;the spray angle increases with increasing gas/liquid mass ratio or flow rate; the spray pattern is fairly evenly distributed within combined cyclone.更多还原