Schadstoffoptimierter Betrieb eines 10 MW-Erdgasbrenners durch Flammenanalyse an einem Modellbrenner und am Original

The firing system of a 25 MW boiler operating with natural gas was optimized to achieve low pollu-tant emissions. The investigations included measurements as well as CFD-calculauons at a scaled down burner and at full scale. This paper deals with the experimental activities. At the burner model the experiments were conducted with a LDV system, with a Laser Diagnostic System (Laser Induced Fluorescence, Rayleigh scattering) and with suction technique to investigate the relations between the flow field, the chemical reaction, the flame temperatures and the NO_x emissions. The results of this analysis were verified by measuring the flame temperatures at the original burner with a non cooled ceramic suction pyrometer These investigations give a precise insight into the relations between bur-ner setup, flame structure and pollutant emissions. As a result of these activities an adjustment of mixing fuel and air was found to reduce NO_x emissions by 15 % without any increase of CO forma-tion.