Abstract
1000MWe capacity supercritical utility units employ 2950 t/h tangential-fired boiler, which uses the low NOx concentric firing system (LNCFS) and the deep air staged technology for reduce the NOx emission. The large capacity boiler uses eight burners at the same level, located at corner and the middle of the wall, which form the double fire balls in the furnace. In this work, the flow fields in the furnace were obtained by measuring the air velocity in the model furnace with over fire air and concentric firing system, the diameter of the air circle is also measured.
