| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a method for direct reduction ironmaking capable of collecting and utilizing most of waste heat generated in a natural gas reformer in a reforming process and of achieving excellent energy efficiency, and to provide an apparatus for production of a reducing gas therefor. <P>SOLUTION: Reforming of a natural gas is performed by charging the natural gas 1, steam 2 and oxygen 6 in a reformer 50 to burn partially. The obtained reducing gas containing hydrogen and carbon monoxide is supplied to a shaft furnace 30 through a line 56, and an iron ore 7 is reduced in the shaft furnace 30 to produce a direct reduction iron 8. The waste gas generated in the shaft furnace 30 is introduced into a carbon dioxide-removing device 40, and after removal of carbon dioxide, the waste gas is reutilized as the reducing gas in the shaft furnace 30 through a waste gas-reutilizing line 49. <P>COPYRIGHT: (C)2012,JPO&INPIT |
