| 摘要 |
Apparatus for injecting gas into a vessel comprises a lance 26 having a gas flow duct 31 extending longitudinally from a rear end to a forward end (36) from which to discharge gas from the duct. An elongate body 38 disposed within the forward end of the duct is fitted with flow directing vanes 39 to impart swirl to the discharging gas. The tip 44 is internally cooled by water supplied and returned through supply and return passages 52, 56. Cooling water is also passed through internal cooling passages 66, 75, 76, 87 within vanes 39 and central body 38 via water supply and return passage 60 within the duct.
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