Experiments have been carried out to achieve a better understanding of the flow phenomena responsible for the fouling damage in the outlet tube of a gas cyclone. A high efficiency Stairmand gas cyclone scaled down to 75% was used for this study. The effects of the gas flowrate and the diameter of the gas outlet tube on flow oscillations and back flow has been investigated for three outlet tube diameters. The experiments show regular periodic motions together with back flow in the center of the cyclone core for all geometries. The oscillation frequency scales linearly with the superficial gas velocity and decreases with increasing gas outlet tube diameter. The results also indicate that the oscillation and back flow penetrate well down into the gas outlet tube, close to the roof of the cyclone.
展开▼
