Burner with a moveable air flow diverter

A burner, comprising:

• an oxidant feed passage (11) for providing an oxidant feed;
• a fuel feed passage (12) surrounding the oxidant feed passage and for providing a fuel feed stream (12a);
• an air flow annulus (13) surrounding the fuel feed passage and for providing an air feed stream (13a), the air feed stream which converges with the fuel feed stream (12a) downstream of the burner being contained with the air flow annulus at least partially surrounding the fuel feed passage;
• a plurality of oxidant injectors (16) positioned about the burner each one of the plurality of oxidant injectors being surrounded by another air flow annulus (18);
• and
• a movable air flow diverter (55) positionable in the air feed stream along at least an outer surface portion of the fuel feed passage, the movable air flow diverter being (i) reciprocally positionable along a portion of a longitudinal axis of the fuel feed passage and including a side wall constructed to proportion distribution of the air feed stream, and (ii) adapted to divert and distribute a portion of the air feed steam (13a) from the air flow annulus (13) to the another air flow annulus (18) to thereby surround each of the plurality of oxident injectors (16).