| abstract |
(57) [Abstract] [Problem] To shorten melting time, reduce power consumption unit, and Reduces problems at the burner tip and furnace body, greatly improving productivity. SOLUTION: An oxygen gas ejection pipe 12 for ejecting oxygen gas from a central portion, a fuel ejection pipe 13 for ejecting fuel from an outer peripheral portion of the oxygen gas ejection pipe 12, and the fuel ejection pipe 1 3 is constituted by a triple pipe of a combustion oxygen gas ejection pipe 14 for ejecting combustion oxygen gas from the outer peripheral portion. In order to increase the velocity of the oxygen gas ejected from the center, the oxygen gas ejection pipe 12 Is provided with a squeezed portion 12a at the tip of the slab. In order to impart a swirl to the combustion oxygen gas ejected from the outermost periphery, a swirl blade 16 is provided in an annular space 15 formed by the fuel ejection pipe 13 and the combustion oxygen gas ejection pipe 14. |