Industrial burner with low NOx emissions and method of operating the same

摘要

The fuel supply unit (17,18) which passes through the permanently air-charged burner chamber can be switched between two operating states where the fuel nozzle units (25,26) are positioned differently relative to the outlet of the burner chamber. In the first operating state the fuel is introduced into the burner chamber producing a mixture of fuel and air which burns in the chamber with stable flame. In the second operating state with the temperature above the ignition temperature of the fuel/air mixture in the heating chamber the reaction between fuel and combustion air leaving the outlet of the burner chamber with high output impulse is substantially suppressed inside the burner chamber and moved into the heating chamber. At least in the second operating state the burner chamber is biased by the air supply unit with an air throughput which is so high that through the combustion air emerging from the outlet of the burner chamber combustion exhaust gases are sucked out of the heating chamber through injection action and mixed with the combustion air.