Method for operating blast furnace and method for producing molten pig iron
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United States of America Patent
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Nov 14, 2017
Grant Date -
Oct 1, 2015
app pub date -
Dec 4, 2013
filing date -
Dec 7, 2012
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Abstract
Provided is a blast-furnace operating method including: a first step of adjusting a charging rate of coke while monitoring a furnace-top temperature Ttop; a second step of adjusting an injection rate of pulverized coal while monitoring an in-furnace superficial gas velocity u and the furnace-top temperature Ttop; a third step of adjusting an oxygen-enrichment ratio of oxygen-enriched air while monitoring a tuyere combustion temperature Tf and the furnace-top temperature Ttop; and a fourth step of determining whether an injection rate of the oxygen-enriched air needs to be adjusted, based on a value of the in-furnace superficial gas velocity u.
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