本文通过实验和理论对流化床燃烧过程的声发射现象进行分析，从声学角度对燃煤流化床内的气泡运动特征进行了探讨。实验研究包括热态流化床和冷态流化床对比实验，确定了声波时序与气泡过程的对应性，运用瞬态谱理论获得了气泡爆破过程的能量尺度和时间尺度参数。最后，对气泡时序进行了非线性特征分析 In this paper, the phenomenon of acoustic emission in the process of fluidized bed combustion is analyzed through experiments and theories, and the characteristics of bubble movement in a coal-fired fluidized bed are discussed from an acoustic point of view. The experimental study includes comparative experiments of hot fluidized bed and cold fluidized bed, and confirms the correspondence between acoustic time series and bubble process. The energy scale and time scale parameters of bubble blasting process are obtained by using transient spectroscopy theory. Finally, the bubble timing is analyzed nonlinearly