The report here presented serves a summary of the activities and findings related to the testing of the prototype oxyfuel burner in the 500 kW test facility. This document presents information on the design of the prototype burner, including the criteria and constraints considered for downscaling. Likewise, a description of the test facility and demonstration cases is made including carried out measurements. Furthermore, an interpretation of the measurements is done to understand the differences between air and oxyfuel firing experiments. This information has been used for validation of further analysis tools, including CFD and process simulations. Finally, assessments of the results as well as relevant conclusions are drawn from these investigations.