Low NoX burner apparatus

A low NOX burner for combusting fuel gas and air in an enclosure comprising:

• a burner block having an inlet end and an outlet end and a central opening therethrough between the ends, the burner block outlet end having a ledge;
• and
• a plurality of fuel ejection tips positioned in substantially the same plane as said ledge, each fuel ejection tip having an ignition port for injecting fuel gas into said central opening along said ledge, and at least one firing port for injecting fuel gas in a substantially vertical directions
• wherein said central opening in said block is defined by a first substantially cylindrical portion having a first end and a second end and a second portion having a third end and a fourth end, said first end of said first substantially cylindrical portion communicating with said block inlet end and said second end communicating with said third end of said second portion forming a ledge, said fourth end of said second portion communicating with said block outlet end.

A burner for reduced NOX emissions comprising:

• a burner block having an inlet end, an outlet end, and an opening extending therethrough between said ends;
• said burner block comprising a first longitudinal interior portion having a first end at said inlet end and a second end forming a radial ledge around said opening, said radial ledge being positioned in said opening between said inlet end and said outlet end;
• and
• a plurality of fuel ejectors positioned around said opening and having fuel ejection ports positioned therein in a manner effective for ejecting fuel inwardly along said radial ledge into said opening.

A burner for reduced NOX emissions comprising:

• a burner block having an inlet end, an outlet end, and an opening extending therethrough between said ends;
• a plurality of flow channels within said burner block around said opening, said flow channels being bounded on one side by a ledge in said burner block around said opening and said flow channels being unbounded at said outlet end of said burner block;
• and
• a plurality of fuel ejectors positioned around said opening having ejection ports positioned therein in a manner effective for ejecting fuel inwardly through said flow channels along said ledge into said opening.

A burner for reduced NOX emissions comprising:

• a burner block having an inlet end, an outlet end, and an opening extending therethrough between said ends;
• a plurality of open flow channels within said burner block, said open flow channels being unbounded at said outlet end of said burner block;
• and
• a plurality of fuel ejectors positioned around said opening having ejected ports positioned in a manner effective for ejecting fuel through said open flow channels into said opening,
• wherein each of said open flow channels has sides which diverge, with respect to each other, away from said fuel ejectors.

A burner for reduced NOX emissions comprising:

• a burner block having an inlet end, an outlet end, and an opening extending therethrough between said ends;
• a plurality of open flow channels within said burner block, said open flow channels being unbounded at said outlet end of said burner block;
• and
• a plurality of fuel ejectors positioned around said opening having ejection ports positioned in a manner effective for ejecting fuel through said open flow channels into said opening,
• wherein said fuel ejectors have second fuel ejection ports positioned therein in a manner effective for ejecting fuel from said second fuel ejection ports toward a combustion zone outside of said outlet end.