Patent ID: 8529247

Claim:
A burner tile for use in association with a burner plenum to form a gas burner apparatus for discharging a mixture of fuel gas and air into a furnace wherein the mixture is burned in the presence of flue gas while producing a low content of nitrous oxides, wherein the burner plenum includes a housing for attachment to the furnace that includes an upper end having an air outlet disposed therein, said burner tile is made of a heat and flame resistant refractory material and has a central opening therein for receiving air from the outlet of the plenum housing and comprising: a bottom end attachable to the upper end of the plenum housing over the air outlet disposed therein; a top end opposing said bottom end, said top end including a discharge outlet; and a wall connecting said bottom end to said top end and surrounding said central opening, said wall extendable into said furnace and having an interior surface, an exterior surface and at least one gas circulation port extending through said wall from said exterior surface to said interior surface, said interior surface of said wall including an internal Coanda surface which bulges into said central opening, said burner tile being configured such that fuel can be injected on or adjacent to said internal Coanda surface from outside said central opening through said gas circulation port.