关键词: 多管旋风分离器, 数值模拟, 分离效率, 压降, 入口速度

Abstract: The separation efficiency and pressure drop of a multi-tube cyclone separator were simulated to evaluate its separation performance in the inlet velocity range from 7 to 27 m/s, particle density 1000 to 5000 kg/m3, particle total flow rate 2.5~2500 g/m3 and operating pressure 1 to 5 MPa. The results show that the pressure drop of multi-tube is mainly composed of that from single tubes, being about 80%~90% of the whole pressure drop. The distribution of flow field in single tubes is the same as that in the multi-tube state, with symmetrical distribution along the axial direction and minimum value at the central vortex core. The separation efficiency and pressure drop of 21-tube cyclone increases with increasing of inlet velocity, and the separation efficiency increases from 30.57% to 63.86% while the pressure drop increases from 9053 to 116864 Pa when the particle diameters distribute in the range of 1~10 mm. This structure could separate particles almost completely if their diameters were bigger than 6 mm. And with increasing of particles density, the separation efficiency rises up while the pressure drop almost remains unchanged. When operation pressure increases, the separation efficiency becomes lower, but the pressure drop slightly increases. Besides, the air inflow fluctuation of all the 21 cyclone tubes will not exceed 5%.

Key words: multi-tube cyclone separator, numerical simulation, separation efficiency, pressure drop, inlet velocity