抄録
In order that top gas of a pig iron blast furnace can be utilized for ammonia synthesis by itself, oxygen content of the blast should be enriched to about 50-60%.
It seems that there has never been any report on the industrialization of a blast furnace by such highly oxygen-enriched blast.
The authors have succeeded in the operation of test furnaces and an industrial furnace by such blast, the results of which are reported in this paper.
As the results of test furnaces, blow-in of the cleaned top gas through tuyeres together with the blast or injection of heavy oil was adopted to lower extremely high combustion temperature in front of the tuyeres and to increase the volume of ascending bosh gas.
The industrial operation was successfully continued for three years and ten months at max. 55% oxygen in blast and produced about 90 000 tons of foundry pig iron and 134×106 Nm3 of effective gas (CO+H2) equivalent to about 60 000 tons of ammonia by the time of stoppage on account of changerof ammonia plant.
