In-stream burner module

A burner module in an air stream comprising:

• a feed pipe of substantially circular cross section and having a central axis;
• a plane P passing through the center of the feed pipe and parallel to an air stream;
• at least two primary fuel injection orifices situated on a section of the pipe and intended to produce a flame, the at least two primary fuel injection orifices are arranged symmetrically with respect to the plane P, wherein each of the at least two primary fuel injection orifices is at an angle α with the plane P, the angle α is between 10° and 30° inclusive;
• a first fin comprising a first deflection element;
• a second fin comprising a second deflection element, wherein the first fin and the second fin are arranged symmetrically with respect to the plane P, wherein the first fin and the second fin are each at an angle β with the plane, and the angle β is between 2α and 3α;
• wherein the first deflection element and the second deflection element are each at an angle θ with respect to the plane P, and the angle θ is substantially equal to the angle α;
• a third fin comprising a third deflection element;
• a fourth fin comprising a fourth deflection element, wherein the third fin and the fourth fin are arranged symmetrically with respect to the plane P, wherein the third fin and the fourth fin are each at the angle β with the plane P;
• wherein the third deflection element and the fourth deflection element are each at the angle θ with respect to the plane P;
• a first oxidant injection opening and a second oxidant opening that are arranged symmetrically with respect to the plane P, wherein the first oxidant injection opening is defined between the first deflection element and the third deflection element, and the second oxidant injection opening is defined between the second deflection element and the fourth deflection element;
• wherein the third deflection element is positioned further downstream of the first oxidant injection opening relative to the air stream than the first deflection element;
• and
• wherein the fourth deflection element is positioned further downstream of the second oxidant injection opening relative to the air stream than the second deflection element.