Dynamic phenomena associated with the combustion of gaseous mixtures of a fuel and air in a bubbling fluidized bed have been analyzed. The multiphase hydrodynamic structure of a bubbling fluidized bed leads to combustion which can be either explosive in the bubbles or continuous in the emulsion phase. These two modes of combustion can be distinguished by analyzing the acoustic effects. An algorithm is proposed to determine the frequency of the explosions. This algorithm has been used to examine experimental results obtained in laboratory-scale experiments. It is shown that the frequency of the explosions decreases with rising temperature. This leads to continuous combustion above a certain "transition temperature."