OCR Text |
Show • excess air level • extent of flue gas recirculation • location of flue gas recirculation (LNV only) • burner swirl adjustment (LNV only) • primary/secondary air distribution (LNV only) • combustion air temperature (EV only) • thermal load • thermal environment (LNV only) • backup No. 2 fuel oil (LNV only) During the experiments, the following parameters were measured: • Furnace outlet temperature • NOx, C O, 02, T H C emissions • Heat flux (total and radiative flux meter) • Flame length (through C O in-furnace concentrations) • Burner pressure drop ISBF TEST FACILITY The facility used for burner evaluations is a front-fired test furnace with a maximum firing rate of 90 x 106 Btu/hr. The combustion chamber is water-cooled and the walls can be fully insulated or left non-insulated with 212°F sink temperature. Burners are installed on the front wall of the facility, which is not water-cooled but protected with a blanket insulation. A n ABB Air Preheater Q-Pipe recuperative air heater is used to provide up to 500°F heated combustion air to the burner assembly or bypassed during ambient air testing. A heat exchanger tube bank was installed in the ISBF prior to the experiments to meet the desired full load volumetric heat release rate of 60,000 Btu/ft3 hr, and heat extraction typical for the range of wall-fired industrial boilers considered as potential applications. The bulk furnace residence time during these combustion tests was approximately 1 second and the furnace outlet temperature (FOT) was between 2300-2500°F. The furnace outlet temperatures were taken immediately prior to the tube bank. The ABB testing facility is fully instrumented for air, FGR, and fuel flow and temperature measurement.2 • 6 IV-24 |