To provide a continuous heating furnace and its operation method causing no increase in equipment cost and operation cost, causing no deterioration in the yield and quality of slab, capable of easily changing heating temperature even when inserting a slab different in the heating temperature, restraining generation of nitrogen oxides in the furnace, and allowing stable combustion even for various fuels.
This continuous heating furnace heats slab, and has a tubular combustion chamber having one end opened in the furnace, a tubular flame burner having 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, a fuel supply device for mixing and supplying two or more kinds of fuels having a different heating quantity to the tubular flame burner and a combustion control device for controlling the mixing ratio of the respective fuels in the fuel supply device.
SHIMADA TATSUYA
TAKASHI KOICHI
KUSADA TAKAMITSU
Next Patent: HEATING FURNACE WITH TUBULAR FLAME BURNER AND COMBUSTION CONTROL METHOD