The present invention satisfies 0.19 ≤ L/L0 ≤ 0.82, where L0, given a cross section including the center axis of a lance and bisecting a boundary plane between a flow path of a lance inner tube and a nozzle hole, is the length of a line segment which passes through the most downstream point of the lance on the boundary plane and traverses the nozzle hole on a straight line perpendicular to the lance center axis, and L is the length of said traversing line segment when projected within the range of the flow path of the lance inner tube on a horizontal cross section taken perpendicular to the lance center axis.
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机译：本发明满足0.19≤L/ L 0 ≤0.82，其中L 0 ，给定包括喷枪的中心轴并且将流之间的边界平面二等分的横截面。喷枪内管和喷嘴孔的路径，是在边界平面上穿过喷枪最下游点并在垂直于喷枪中心轴的直线上穿过喷嘴孔的线段的长度，是在垂直于喷枪中心轴线截取的水平横截面上在喷枪内管的流路范围内投影时所述横移线段的长度。
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