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    • 7. 发明公开
    • POWDER INJECTION LANCE AND METHOD OF REFINING MOLTEN IRON USING SAID POWDER INJECTION LANCE
    • PULVEREINBLASLANZE UND VERFAHREN ZUM RAFFINIENEN VON GESCHMOLZENEM EISEN UNTER VERWENDUNG DIESER PULVEREINBLASLANZE
    • EP2752497A1
    • 2014-07-09
    • EP12841632.8
    • 2012-10-16
    • JFE Steel Corporation
    • OKUYAMA, GoroKIKUCHI, NaokiUCHIDA, YuichiTAKAHASHI, YukioSATO, ShingoNAKASE, KenjiTA, YasutakaMIKI, Yuji
    • C21C5/46C21C1/02C21C5/30
    • C21C5/32C21C1/02C21C5/35C21C5/4606C21C5/462C21C5/5217C21C7/0037F27D2019/0034F27D2019/0075Y02P10/216
    • A top-blowing lance with which the hot metal blend ratio can be reduced and a method for refining molten iron and a smelting reduction method for molten metal using the injection lance are proposed. The top-blowing lance includes a refining oxygen gas blowing nozzle having a plurality of ejection openings through which oxygen gas is blown into an iron bath in a reaction vessel, the ejection openings being disposed along a circular orbit at intervals, and a burner nozzle having an axis coaxial with the central axis of the circular orbit, forming a flame inside the refining oxygen gas blowing nozzle, and having ejection openings for blowing a powder heated by the flame into the iron bath, wherein an indicator A that indicates the positional relationship between the ejection openings of the refining oxygen gas blowing nozzle and the ejection openings of the burner nozzle satisfies the following condition: A = 1.7 ⁢ R - r - d / 2 / L + tan θ - 12 ⁢ ° - 0.0524 > 0
      where R denotes the pitch circle radius of the ejection openings of the refining oxygen gas blowing nozzle (mm),
      r denotes the radius of the ejection openings of the burner nozzle (mm),
      d denotes the diameter of the ejection openings of the refining oxygen nozzle (mm),
      θ denotes the angle (inclination) between the axis of the refining oxygen gas blowing nozzle and the central axis of the circular orbit (°), and
      L denotes the lance height (mm).
    • 提出了一种可以减少热金属混合比的顶吹喷枪和用于精炼铁水的方法和使用注射喷枪的熔融金属冶炼还原方法。 顶吹喷枪包括精炼氧气吹制喷嘴,其具有多个喷射口,氧气被吹入反应容器中的铁浴中,喷射口沿着圆形轨道间隔设置,燃烧器喷嘴具有 与圆形轨道的中心轴同轴的轴,在精炼氧气吹制喷嘴内部形成火焰,并具有用于将由火焰加热的粉末吹入铁浴的喷射口,其中指示器A指示 精炼氧气吹制喷嘴的喷射口和燃烧器喷嘴的喷射口满足以下条件:A = 1.7 ¢R-r-d / 2 / L + tan¸-12 ¢°-0.0524> 0其中 R表示精炼氧气吹出喷嘴的喷射口的节圆半径(mm),r表示燃烧器喷嘴的喷射口的半径(mm),d表示 精炼氧气喷嘴的喷射口(mm),¸表示精炼氧气吹制喷嘴的轴线与圆形轨道的中心轴线(°)之间的角度(倾斜度),L表示喷枪高度(mm)。