Performance analysis of the separator with inner channels by experiment and CFD-POST

Abstract

ABSTRACT The separator with inner channels is designed to solve the re-entrainment phenomenon of particles, improving the separation efficiency. Firstly, experiments are established to compare the separation efficiency and pressure drop between ordinary separators and ones with inner channels. Secondly, the Reynolds Stress model and the Euler–Euler model are applied to simulate the turbulence and particle flow, respectively. Lastly, the Population Balance model (PBM) is used to define different distributions of particle diameter by initial moments. The research results demonstrate that the inner channels can improve separation efficiency significantly because they can restrain the re-entrainment phenomenon. The separation efficiency of the design and the conventional ones is 97% and 90%, respectively, but the pressure drop increases by 39 Pa in this structure. Simultaneously, this structure has a lower tangential velocity compared with the separator without inner channels, reducing particle collisions with the wall. Radial pressure differences are also declined in the structures with inner channels, leading to a decreased pressure gradient force. Furthermore, the sixth moment has a larger median particle size, while the particle size distribution at the outlet of the separator is similar to that at the inlet via the PBM. And the maximum separation efficiency of the design and ordinary ones is 99% and 80%, respectively. The characteristics listed above can help with efficient separator design.