PURPOSE: To improve the efficiency of production by connecting the bottom of the wind box of a prereduction furnace and the upper part of a smelting reduction furnace by a pipeline and providing an opening adjusting damper on the exhaust gas pipe of the prereduction furnace.
CONSTITUTION: The smelting reduction device for metals is provided with the smelting reduction furnace 2 and the fluidized bed type prereduction furnace 1 into which the gas generated in the smelting reduction furnace is introduced as a reducing gas from the lower wind box 16 and which brings the gas into contact with metal oxide ore and discharges the gas from the exhaust gas pipe 4 in the upper part. The bottom of the wind box 1b of the prereduction furnace 1 and the upper part of the smelting reduction furnace 2 are, thereupon, connected by the pipeline 3 in common use as the passage for the metal oxide ore from the former to the latter and the passage for the gas from the latter to the former. An opening degree adjusting damper 5 is provided on the exhaust gas pipe 14 of the prereduction furnace 1. The charging temp. of the prereduced iron to the smelting reduction furnace is increased in this way and the thermal efficiency is improved.
MURAKAMI KEIKICHI
KISHIMOTO MITSUHARU
UCHIYAMA YOSHIO
TAKIURA MASARU
TATSUTA SATOSHI
TAKAZA YUKIHIKO
SATO SUMIO
