Patent ID: 8062027

Claim:
An industrial burner with low NO x emissions, in particular for heating furnace rooms of industrial furnaces comprising: a mixing chamber connected with a furnace room, which is provided with at least one opening into the furnace room, through which opening at least a partially-mixed flow from the mixing chamber dispenses into a furnace room during operation; a combustion air supplier, through which the mixing chamber is supplied with combustion air delivered from a radially outside direction during operation; and, a fuel supplier, with which fuel is introduced into the mixing chamber, wherein the fuel supplier is arranged and constructed to switch between a first and a second operation state, wherein in the first operation state, fuel is introduced into the mixing chamber at a first angle with respect to the axial direction of the mixing chamber and at a fixed axial distance within said mixing chamber with respect to said at least one opening into said furnace room such that fuel and air are mixed thoroughly in the mixing chamber and at least a partial reaction is carried out therein such that a flame is produced in said mixing chamber; and wherein in the second operation state, fuel is introduced into the mixing chamber at the same fixed axial distance within said mixing chamber with respect to said at least one opening into said furnace room as in the first operation state and additionally at least at a second angle with respect to the axial direction of the mixing chamber, which second angle is different from the first angle; wherein said combustion air is introduced into said mixing chamber at a point radially outside said first angle introduction point and said second angle introduction point; wherein said first angle is larger than said second angle; wherein said fuel from said first angle is introduced into the mixing chamber farther from said axis than fuel introduced into the mixing chamber from said second angle; wherein in said second operation state combustion is substantially shifted to said furnace room; and, wherein said industrial burner is configured to heat said furnace room of said industrial burner.