| 摘要 |
A burner body defines a combustion zone and a secondary dilution zone. A first inlet opening leads to the combustion zone to admit fuel and air while a second inlet opening leads to the secondary dilution zone. The burner body contains a tertiary dilution zone connected to a third inlet opening. The secondary dilution zone is positioned downstream from the combustion zone and the tertiary dilution zone is positioned downstream from the secondary dilution zone. The flow areas of the first inlet opening and the second inlet opening is arranged to have a constant ratio. An air passage supplies air to the first, second and third inlet openings and a flow controller is positioned to control the air flow through the third inlet opening. When the flow controller is closed, air flows from the passage through the first and second inlet openings, while, when the flow controller is open, air flows from the passage through the first, second and third inlet openings. The fuel flow to the combustion zone is varied in response to the temperature within the zone. Fuel vaporizer means are positioned downstream from the secondary dilution zone and upstream from the tertiary dilution zone. The first and second inlet openings are constructed to provide a quantity of cooling air through the second inlet opening which reduces the temperature of the exhaust gases from the combustion zone to a level sufficient to vaporize fuel within the fuel vaporizer means without thermally degrading the fuel to cause coking.
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