| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a method for operating a blast furnace, which blows a liquid or gaseous ancillary reducing material such as fuel oil and a natural gas, which has a high heating value and does not contain ash, into the blast furnace together with a solid reducing material, but prevents the degradation of air permeability, and consequently takes out the maximum effect of charged hydrogen. <P>SOLUTION: The method for operating the blast furnace while blowing the gaseous or liquid reducing material as the ancillary reducing material together with the solid reducing material from a tuyere includes blowing the gaseous reducing material or liquid reducing material having a ratio H/C of 1.5 or larger simultaneously with the solid reducing material, while adjusting the quantity to be blown of the solid reducing material and/or the gaseous reducing material or the liquid reducing material so that a ratio of H<SB>2</SB>/CO in the Bosch gas can be 0.22 or larger. <P>COPYRIGHT: (C)2006,JPO&NCIPI</p> |
