| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a method for operating a blast furnace at low cost, by which, in particular, insufficient temperature rising in the furnace top portion can be avoided even when a low RAR operation (for carbon dioxide emission reduction) is performed by blowing a large amount of reduction material having a high hydrogen content in the blast furnace. <P>SOLUTION: In this method for operating the blast furnace at a low reduction material ratio, the reduction material with a high hydrogen content is blown through a tuyere. In the blast furnace operation method, when preheated gas is blown from a shaft part of a blast furnace 1, one or more selected from among the blowing temperature, blowing amount and height position (h/h0) of the preheated gas are controlled to adjust furnace gas temperature. The furnace gas temperature is preferably adjusted when the H<SB POS="POST">2</SB>concentration in bosh gas is increased to 10% by volume or higher. <P>COPYRIGHT: (C)2012,JPO&INPIT</p> |
