This paper reporls char burnout data which supplement previously published gas phase data for Ihe large scale pulverized-coal-fired cylindrical combustor at Imperial College. The data demonstrate the effects of: excess air ratio, the ratio of the primary to secondary momenta and the secondary swirl number. Great care has been exercised to ensure axial symmetrical flow conditions in order that the data set may be of particular value to mathematical modellers. It emerges that the quality of the burnout in the near burner region, is primarily influenced by the particles residence time in the burner inner recirculation zone.