A dry low NO.sub.X staged combustion system includes a fuel nozzle and a combustion compartment. The fuel nozzle includes a purge gas tube, a diffusion combustion fuel tube, an isolation gas tube, a premixed combustion fuel tube, a premixed combustion air tube. The purge gas tube is configured to feed a purge gas. The diffusion combustion fuel tube is fitted over the purge gas tube, and having an end provided with a diffusion combustion fuel swirler. The isolation gas tube is fitted over the diffusion combustion fuel tube. The premixed combustion fuel tube is fitted over the isolation gas tube. The premixed combustion air tube is fitted over the premixed combustion fuel tube. The combustion compartment is located downstream of the fuel nozzle.

The present inventions provide, among other things, tapered burner tubes having raised gas ports and a smooth interior surface free from obstructions. Venturi members and air shutters may also be included.

The present inventions provide, among other things, tapered burner tubes having raised gas ports and a smooth interior surface free from obstructions. Venturi members and air shutters may also be included.

A safe gas flame device providing more visible flames includes a burner having an air inlet end and a flame exit. The combustion end is configured to include a horizontal section of a fluid transporting tube. A fluid guiding device connects to the burner and includes at least one first and at least one second supporting structures disposed on opposite sides of the fluid transporting tube, a plurality of first fluid guiding members connecting and extending transversely to the at least one first supporting structure and arranged side by side along a length of the at least one first supporting structure, and a plurality of second fluid guiding members connecting and extending transversely to the at least one second supporting structure and arranged side by side along a length of the at least one second supporting structure.

A safe gas flame device providing more visible flames includes a burner having an air inlet end and a flame exit. The combustion end is configured to include a horizontal section of a fluid transporting tube. A fluid guiding device connects to the burner and includes at least one first and at least one second supporting structures disposed on opposite sides of the fluid transporting tube, a plurality of first fluid guiding members connecting and extending transversely to the at least one first supporting structure and arranged side by side along a length of the at least one first supporting structure, and a plurality of second fluid guiding members connecting and extending transversely to the at least one second supporting structure and arranged side by side along a length of the at least one second supporting structure.

Process and apparatuses for providing a stable flame in a burner assembly are provided. In an embodiment, the apparatus includes a burner assembly comprising a burner tile having a top surface, an outside surface, a pre-mix region and defining an interior space for introduction of combustion air. A plurality of primary fuel tips are disposed in the interior space for injection of a primary fuel followed by mixing of a portion of the primary fuel and a portion of the combustion air mix in the pre-mix region to provide a primary fuel-air mixture. A plurality of secondary fuel tips are located on the top surface or mounted near the outside surface of the burner tile. A plurality of low velocity ports are located on the top surface of the burner tile for injecting the primary fuel-air mixture from the pre-mix region.

Process and apparatuses for providing a stable flame in a burner assembly are provided. In an embodiment, the apparatus includes a burner assembly comprising a burner tile having a top surface, an outside surface, a pre-mix region and defining an interior space for introduction of combustion air. A plurality of primary fuel tips are disposed in the interior space for injection of a primary fuel followed by mixing of a portion of the primary fuel and a portion of the combustion air mix in the pre-mix region to provide a primary fuel-air mixture. A plurality of secondary fuel tips are located on the top surface or mounted near the outside surface of the burner tile. A plurality of low velocity ports are located on the top surface of the burner tile for injecting the primary fuel-air mixture from the pre-mix region.

A gaseous fuel-air burner having a bluff body flame stabilizer, and methods of operating the same, are described herein. One device includes a bluff body configured to stabilize a flame produced by the gaseous fuel-air burner, wherein the bluff body has a conical shape configured to stabilize the flame by generating a recirculation zone having a stagnation point where the flame is stabilized.

A gaseous fuel-air burner having a bluff body flame stabilizer, and methods of operating the same, are described herein. One device includes a bluff body configured to stabilize a flame produced by the gaseous fuel-air burner, wherein the bluff body has a conical shape configured to stabilize the flame by generating a recirculation zone having a stagnation point where the flame is stabilized.

A method and apparatus for a gas burner head with at least a first burner region and a second burner region, an ignitor located near the gas burner, and a burner drive that is configured to generate relative rotation between the first and second burner regions of the gas burner to transfer a flame between the first and second burner regions during the relative rotation.