Blast furnace, tuyere for blast furnace, and method for supplying reducing gas to blast furnace

The blast furnace design with a strategically positioned reducing gas injection port and lance ensures uniform gas distribution, addressing concentration unevenness and reducing carbon emissions by using hydrogen as a reducing agent.

JP7799234B1Active Publication Date: 2026-01-15NIPPON STEEL CORPORATION
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Patent Information

Application Number
JP2025546909
Authority / Receiving Office
JP · JP
Patent Type
Patents
Current Assignee / Owner
Priority Date
2024-04-22
Filing Date
2025-04-15
Publication Date
2026-01-15
Estimated Expiration
2045-04-15

AI Technical Summary

Technical Problem

The concentration of reducing gas supplied through hot blast tuyeres in a blast furnace tends to be uneven in the radial direction, leading to inefficiencies in the reduction process.

Method used

A blast furnace design incorporating a reducing gas injection port that penetrates the tuyere body and a reducing gas injection lance with an outlet in the hot air flow path, where the outlet positions are strategically positioned to enhance uniform gas distribution, including the use of hydrogen gas as the reducing agent.

Benefits of technology

This configuration suppresses unevenness in reducing gas concentration within the blast furnace, allowing for more uniform distribution and stable operation, reducing carbon emissions by minimizing the use of carbon-containing materials like coke.

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Abstract

A new technology for suppressing bias in the radial distribution of reducing gas concentration inside a blast furnace when reducing gas is supplied into the interior of the blast furnace is disclosed. One embodiment of the technology disclosed herein is a blast furnace having a hot blast tuyere, the hot blast tuyere having a tuyere body, a reducing gas injection port, and a reducing gas injection lance, the tuyere body having a hot blast flow path, the reducing gas injection port penetrating a wall of the tuyere body, and the reducing gas injection lance having an outlet within the hot blast flow path.
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