Abstract
Gas–solid separation fluidized bed is a typical method for coal separation without water utilization. Geldart A particles is also considered as the ideal dense medium to strengthen separation efficiency. Fluidization stability reflects the bed pressure fluctuations and the distribution of bubble and emulsion phases, affecting the separation performance. And the main frequency of pressure fluctuations can directly reflect the degree of pressure fluctuations. Therefore, the detailed fluidization stability is analyzed combined the method of standard deviation of pressure fluctuations, power spectral density, etc., for Geldart A particles. The results showed that maintaining an appropriate gas velocity resulted in an average bed pressure of around 2000 Pa. The main frequency is mainly concentrated around 1–1.5 Hz. Finally, a prediction model of the main frequency of pressure fluctuations is established, and the error can be controlled within ±0.15. The investigation further proved the stable fluidization of Geldart A particles and provides a method for predicting the main frequency of pressure fluctuations in the gas–solid separation fluidized bed.
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