To provide a continuous heating furnace and its operation method capable of maintaining a stable combustion state even at low combustion load time, and preventing reduction in yield and the deterioration in the quality of slab without increasing the equipment cost and operation cost.
This continuous heating furnace has heating burners. At least one of the heating burners is formed as a tubular flame burner 2 having a tubular combustion chamber having one end opened in the furnace, an oxygen-containing gas blowing-in nozzle and a fuel blowing-in nozzle or a premix blowing-in nozzle of oxygen-containing gas and fuel arranged so that the blowing-in direction becomes the almost tangent direction to the inner wall surface of the combustion chamber to the combustion chamber.
SHIMADA TATSUYA
TAKASHI KOICHI
KUSADA TAKAMITSU
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