Experimental study of pressure fluctuation in a gas-solid cyclone separator

Abstract

In order to get further insight into the dynamic property of the vortex, pressure signals at various axial, radial and circumferential positions in a gas-solid cyclone were measured by multi-input dynamic pressure transducer. By adopting probability density function, standard deviation, and power spectral density methods, the characteristics of the pressure signals were analyzed and discussed. Experimental results show that there are two dominant frequencies (about 71Hz and 179Hz) of the pressure fluctuation in the gas flow: the former (about 71Hz) is related to the quasi-forced vortex rotation; the latter (about 179Hz) is related to the swing of the quasi-forced vortex core. The particle strands motion in the gas-solid flow reduces the dispersion of pressure fluctuation, mitigates the off-axis phenomenon of the core to some extent, and adds a dominant low frequency (0.31Hz–0.86Hz) which gets higher with the increase of inlet solids loading. The experimental results can provide insight into the pressure fluctuation in a gas-solid cyclone separator.