| 摘要 |
A gas mixing device for use with a combustion burner assembly is disclosed. The gas mixing device includes an elongate gas expansion nozzle adapted to be positioned within a burner housing, the gas expansion nozzle defining a gas expansion chamber therein extending from a first end to a second end thereof. An inlet port and an outlet port are defined at the respective ends of the gas expansion nozzle. At least one oxidizing gas passageway formed separately of the gas expansion chamber extends from the first end of the second end thereof, and has an oxidizing gas outlet at the second end of the gas expansion nozzle. At least one fuel gas passageway is also formed separately of the gas expansion chamber and extends from the first end to the second end of the gas expansion nozzle, and has a fuel gas outlet at the second end thereof. An elongate gas inlet nozzle is also positioned within the burner housing and is spaced from the first end of the gas expansion nozzle. A portion of the oxidizing gas is passed through the gas inlet nozzle and into the gas expansion chamber, with another portion of the oxidizing gas being passed through the at least one oxidizing gas passageway. A portion of the fuel gas is also passed into the gas expansion chamber and mixes with the oxidizing gas to form a premixed combustion gas stream, with a portion of the fuel gas also being passed through the at least one gas passageway. The separate oxidizing gas and fuel gas streams jacket and surround the premixed combustion gas stream passed from the mixing device. |
