Abstract
A combined probe has been developed to study the combustion processes occurring within the bed of a fluidized bed combustor. This probe is capable of simultaneously detecting bubbles and monitoring the oxygen concentration at a single position in the bed. It consists of a Zirconia-based oxygen sensor located vertically between the two tips of a differential pressure probe. The probe time constants are less than or equal to 0.02 s and 0.01 s, so that it is not only capable of measuring the oxygen concentration in bubble and particulate phases, but can also detect gas composition changes within the bubble itself. Computerised signal analysis techniques have been developed to provide corresponding binary signals indicating the presence at the proble of bubble/particulate phase and oxygen/fuel rich regions, for subsequent statistical analysis. In preliminary experiments of volatiles combustion, the probe data on bubble characteristics and oxygen partial pressures are consistent with the literature results obtained using individual probes.
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