A method for premixing air with a gaseous fuel for being burned in a combustion chamber includes: guiding the air in an air stream along a burner axis through a coaxial air tube into a combustion chamber arranged at an end of said air tube; and impressing a swirl on the air stream by passing it through a first swirl device concentrically arranged within the air tube and comprising a plurality of radially oriented first blades. The method further includes: injecting gaseous fuel into the air stream at the first swirl device; and mixing said air in said air stream with the injected gaseous fuel in a first mixing zone arranged just after said first swirl device.

The present application provides a fuel nozzle for use with a flow of air and a flow of fuel in a gas turbine engine. The fuel nozzle may include a plenum, a mixing tube element positioned within the plenum, and an enhanced mixing feature positioned within the mixing tube element so as to promote mixing of the flow of air and the flow of fuel. The enhanced mixing feature may include a turbulated mixing zone.

A blow torch nozzle (10) having a swirler (26) which is bounded by a generally cylindrical shape (42). The swirler (26) a passageway (28, 40) extending through it defined by a wall surface of the swirler (26). A part of the wall surface extends at an angle to the axis of the nozzle (10) to impart a rotary motion to gases which pass through the swirler (26) in use. The wall surface opens out onto a side of the swirler (42) so the wall surface defines a recess (28, 40) extending inwardly from the side of the swirler (26). The swirler (26) may be provided with a short tube or ring (50) which surrounds the swirler (26) and has ends which are substantially flush with those of the swirler (26). The swirler (26) may be held within the tube or ring (50) by means of an interference fit.

An implosion reactor tube is provided, including: a receptacle body having a tube shape open at a first end; a cylinder positioned within the receptacle body; a mixing chamber at a second end of the receptacle body; the mixing chamber defined by a baffle; the baffle having a plurality of inner passages proximate to the cylinder allowing fluid passage through the baffle and a plurality of outer passages proximate to the receptacle body allowing passage of air and fuel through said baffle; a fuel and air inlet for allowing the air and fuel to enter the mixing chamber; and a flash igniter for igniting the air and fuel.

A turbine engine can utilize a combustor to combust fuel to drive the turbine, which drives the engine. A fuel nozzle assembly can supply fuel to the combustor for combustion or ignition of the fuel. The fuel nozzle assembly can include a swirler and a fuel nozzle to supply a mixture of fuel and air for combustion. Increasing efficiency and carbon-containing emission needs benefit from the use of alternative fuels, which combust at higher temperatures than traditional fuels, requiring improved fuel introduction without the occurrence of flame holding or flashback.

A turbine engine can utilize a combustor to combust fuel to drive the turbine, which drives the engine. A fuel nozzle assembly can supply fuel to the combustor for combustion or ignition of the fuel. The fuel nozzle assembly can include a swirler and a fuel nozzle to supply a mixture of fuel and air for combustion. Increasing efficiency and carbon-containing emission needs benefit from the use of alternative fuels, which combust at higher temperatures than traditional fuels, requiring improved fuel introduction without the occurrence of flame holding or flashback.

An air and gas feeder device for gas boilers, comprising an air-gas conveyance body which comprises: a boiler coupling face configured to be coupled to a boiler at an intake duct of the boiler; an air intake port connected to an air discharge opening by means of an air passage, the air discharge opening leading out from the boiler coupling face; a gas intake port, configured to be fixed to a gas dispensing duct in fluid communication with a gas discharge opening, which leads out from the boiler coupling face; wherein the air discharge opening is coaxial to, and at least partially surrounded by, the gas discharge opening; the air passage accommodates a flow diverter configured to divert an air flow in output from the air discharge opening in the direction of the gas in output from the gas discharge opening and to impart a rotation to said air flow.

A gas turbine engine includes a compressor section, combustion section, and turbine section is serial flow arrangement. A fuel injector supplies a mixture of fuel and air for combustion within the combustion section. An outer wall defines a mixing passage extending along a stream-wise direction including a first mixing region and a second mixing region. A first fuel passage supplies a first fuel to the first mixing region and an air passage supplies a supply of air to the first mixing region. A second fuel passage supplies a second fuel to the second mixing region.

A burner apparatus and method of operating the burner apparatus include a burner housing, and a group of fuel and air swirlers maintained by the burner housing, with the group of fuel and air swirlers supplied by a common fuel and air source. The fuel and air can be directed to one or more of the fuel and air swirlers at a time. Each fuel and air swirler among the group of fuel and air swirlers can mix the fuel and the air, resulting in a combustible mixture of the fuel and the air downstream of the group of fuel and air swirlers. The burner apparatus be implemented as a low NOx multi-port burner apparatus.

An apparatus for drying material for an asphalt mixing facility includes a rotary kiln rotatably drivable about an axis of rotation, in which the material is dried, wherein the rotary kiln has a material inlet and a material outlet, a heating unit coupled to the rotary kiln for feeding heat to the rotary kiln, wherein the heating unit is designed with a burner which has a burner housing having a longitudinal axis, an air duct arranged at the burner housing for feeding air, a swirling element for swirling the air in the burner housing relative to the longitudinal axis, a hydrogen gas line connected to the burner for feeding hydrogen gas into the burner, wherein a hydrogen gas nozzle is connected to the hydrogen gas line for discharging the hydrogen gas, a burner head arranged at the burner housing for generating a burner flame.