Blast furnace operation method

WO2026134267A1PCT designated stage Publication Date: 2026-06-25NIPPON STEEL CORPORATION
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Patent Information

Authority / Receiving Office
WO · WO
Patent Type
Applications
Current Assignee / Owner
NIPPON STEEL CORPORATION
Filing Date
2025-12-17
Publication Date
2026-06-25

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Abstract

This blast furnace operation method comprises: a first blowing step for blowing biomass coal or a combination of the biomass coal and pulverized coal, as well as a first reducing gas from a normal tuyere to the inside of a blast furnace; and a second blowing step for blowing a second reducing gas obtained by separating and removing at least a portion of the CO2 gas and H2O gas from a blast furnace gas from a shaft part tuyere to the inside of the blast furnace. In the first blowing step, when blowing the biomass coal, the biomass coal blown from the normal tuyere is selected using the carbon content percentage and heat of decomposition as management indicators.
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Claims

1. A first injection process in which biomass coal or the biomass coal and pulverized coal, and the first reducing gas are normally blown into the inside of the blast furnace from the tuyeres, and CO ２ Gas and H ２ A method for operating a blast furnace, comprising: a second blowing step in which a second reduced gas obtained by separating and removing at least a portion of the O gas is blown into the interior of the blast furnace from a shaft tuyere; wherein in the first blowing step, when blowing in the biomass coal, the biomass coal to be blown in from the normal tuyere is selected using the carbon content and decomposition heat as control indicators.

2. The method for operating a blast furnace according to claim 1, characterized in that, in the first blowing step, data on the carbon content and decomposition heat are obtained for a plurality of biomass coals that are the same raw material but have different carbonization conditions, one or more types of biomass coal are selected from the plurality of biomass coals such that the carbon content is 0.50 or more and the decomposition heat is 0 kcal / kg or more and 200 kcal / kg or less, and the selected biomass coal is blown in from the normal tuyeres.

3. The method for operating a blast furnace according to claim 1, characterized in that, in the first blowing step, data on the carbon content and decomposition heat of a plurality of biomass coals whose raw materials are different from each other is obtained, one or more types of biomass coals are selected from the plurality of biomass coals such that the carbon content is 0.50 or more and the decomposition heat is 0 kcal / kg or more and 200 kcal / kg or less, and the selected biomass coals are blown in from the tuyeres.