| 摘要 |
PURPOSE:To facilitate the separation of a reducing furnace and a reducing gas producer and to perform the direct reduction operation of iron ore stably in a direct reducing device for iron ore by providing a high temp. shut-off valve between the reducing gas producer and the reducing furnace. CONSTITUTION:A mixture of hydrocarbon and steam or CO2 is fed into a steam reformer 1 as a reducing gas reforming furnace, and is fed as a reducing gaseous mixture of H2 and CO to a reducing furnace 2, by which iron ore is subjected to solid phase reduction. In this case, a high temp. shut-off valve 20 is installed to a line 6 connecting the reformer 1 and the furnace 2, and a gas cooler 21 is provided to a branch line 23. To interrupt the operation of the furnace 2 temporarily on generation of abnormality in the part associating to the furnace 2, the valve 20 is closed, and the high temp. reducing gas from the reformer 1 is flowed to a cooler 21 where it is cooled, then it is released. Since the operation of the reformer 1 can be continued without interruption, it responds immediately when the operation of the furnace 2 is resumed. |
