Acoustic effects accompany the combustion of gaseous fuels in bubbling fluidized beds of inert materials. In an exploratory study of this effect, using a laboratory-size fluidized bed in which a mixture of propane and butane was burned, the bed＇s temperature was monitored continuously and the acoustic effects were recorded. The temperature ranges over which combustion was "noisy" and "quiet" were identified; the acoustic signals were shown to fall into a number of characteristic patterns, which can yield information about the character of the combustion process, in relation to "mini-explosions" in bubbles of the combustible mixture rising through the bed, their intensity and frequency. The results could be used to develop a new method of controlling the operation of fluidized beds burning a gaseous fuel.