| 摘要 |
PURPOSE:To reduce hydrocarbon content in the exhaust gas in a smelting reducing furnace by a method in which the operating pressure of a prereducing furnace is set higher than that of the smelting reducing furnace, and by supplying the exhaust gas of the former to the latter, the high-grade hydrocarbon group in the said gas is pyrolyzed. CONSTITUTION:In the smelting reducing process of iron ore, the operating pressure in a prereducing furnace is set higher than that of a smelting reducing furnace. The exhaust gas containing the hydrocarbon group generated in the prereducing furnace is fed to the smelting reducing furnace using the pressure inclination and is used for the reduction of molten iron, and is made to pyrolyze the high-grade hydrocarbon group of tar, etc. in the exhaust gas by means of intense heat of the smelting reducing furnace. By this system, the prereducing efficiency is improved, so that the iron ore prereduced can be charged to the smelting reducing furnace in the intense heat condition. Furthermore, the transport system for the prereduced ore can be simplified. |
