【Abstract】 Through the experimental study and theoretical analysis on the acoustic emission, theproperties of the gas-particles two-phase flow in the fluidized bed were studied in the coal-firedfluidized bed combustion in the paper. The experimental studies comprise the sound wavedetecting in the bed and digital analysis of the signals. The wavelet transform and Wignerdistribution were used to obtain the energy distribution and the time--varying spectrumdistribution of the sound emitting from the bed. Based on the eXperimental results, theproduce of the bubbles breaking in the bed under the various rate of the fluidized air masswas analyzed, the fractal characteristic of the random motions of gas-particle two-phase flowin the bed were discovered from the information of the sound emission, and the principles ofthe gas-particle multiphase flow in the fluidized bed were developed.更多还原