Abstract: The dual-fuel nozzle for a gas turbine and combustor includes a liquid fuel nozzle surrounded by a gas fuel nozzle. A converging sleeve surrounds the converging outer wall of the combined liquid fuel and gaseous nozzle to form a duct of decreasing cross-sectional area in a downstream direction whereby air flow through the duct accelerates toward the conical droplet spray pattern emerging from the liquid fuel nozzle. An inside swirler is located upstream of the liquid fuel tip to swirl the air flowing through the duct. An outer swirler is provided about the downstream end of the sleeve, likewise to swirl air. The accelerated swirling air flow through the duct and outer swirling air flow preclude impingement of oil spray droplets onto metal surfaces of the nozzle and hence prevent carbon deposition thereon which would otherwise be deleterious to the liquid fuel and gaseous nozzles.

Abstract: This invention relates to fuel nozzles of the type that employ an entrainment fuel nozzle for initial, partial premixing of gaseous fuel and air. Such structures of this type, generally, use the gas jet to entrain surrounding air so that the fuel is somewhat diluted prior to injection into the combustor.

Abstract: Simmer performance in gas ranges is improved by providing a burner grate with a flame impingement ring centered over the gas burner. The burner grate includes a base and a plurality of fingers attached to the base. The flame impingement ring is attached to all or some of the fingers. The flame impingement ring is sized so that simmer flames from the gas burner will impinge thereon. Thus, the flames are directed away from direct impingement on the cooking utensil, and some heat from the flames is absorbed by the grate. The flame impingement ring can have many cross-sectional configurations including curved, circular, oval or straight.

Abstract: An atmospheric gas burner produces improved turndown by separating a small number of the burner ports for simmer service. The burner has an internal baffle which includes a cup section having four outwardly-extending channels. Each one of the channels aligns with a separate one of the ports. The burner also includes a first fuel nozzle arranged to provide fuel to all of the ports in conventional fashion and a second fuel nozzle which provides fuel to the four simmer ports only. The second fuel nozzle has an injection orifice with a smaller cross-sectional area than the injection orifice of the first fuel nozzle. Preferably, the second orifice is sized to provide the same input rate at a maximum pressure that the first orifice does at a minimum pressure. By using a small number of ports for simmer service, the gas velocity through these ports is increased and improved turndown is achieved. In another embodiment, the baffle divides each port into upper lower sections, instead of separating some of the ports.

Abstract: An atmospheric gas burner produces improved flame stability by establishing a higher pressure drop pilot flame at at least one burner port. The burner has a preferably recessed pilot port which is isolated from the primary burner ports. A small portion of the total fuel introduced to the burner is directly fed to the pilot port without entrained air. Consequently, the pilot port supports a high pressure drop diffusion pilot flame which is better able to withstand ambient disturbances. Then in the event that a momentary disturbance extinguishes the primary flames, the pilot flame will serve as a reignition source.

Abstract: This invention relates to a gas burner which employs a two stage flame stabilizer. At low input rates, a fully aerated flame is stabilized at the surface of a porous material. At higher input rates, the flame blows off and is held by flame stabilization tabs. Such structures of this type, generally, operate over a very wide range of input rates and employ a highly aerated flame which reduces the flame temperature, slows NOx production, and increases the overall reaction rate by shortening the flame while reducing carbon monoxide (CO) caused by flame impingement.

Abstract: In a gas burner assembly, the gas burners are equipped with a device constructed of a thermostatic, bimetallic material which autoregulates the amount of primary air that can be entrained into the burner such that the likelihood of an occurrence of lifting or flashback is substantially reduced, and elevated CO emissions at reduced firing rates are eliminated.