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Patent Searching and Data


Title:
BLAST FURNACE OPERATION METHOD
Document Type and Number:
WIPO Patent Application WO/2021/107091
Kind Code:
A1
Abstract:
According to one aspect of the present invention, provided is a blast furnace operation method characterized in that a high-concentration hydrogen-containing gas which contains at least 80 mol% of hydrogen gas, is blown from a tuyere under certain conditions such as: a condition in which the blowing temperature of the high-concentration hydrogen-containing gas is room temperature to 300 °C, and the blown amount of hydrogen gas in the high-concentration hydrogen-containing gas is 200 Nm3/t to 500 Nm3/t; a condition in which the blowing temperature of the high-concentration hydrogen-containing gas is 300 °C to 600 °C, and the blown amount of hydrogen gas in the high-concentration hydrogen-containing gas is at least 145 Nm3/t; or a condition in which the blowing temperature of the high-concentration hydrogen-containing gas is 600 °C to 900 °C, and the blown amount of the high-concentration hydrogen-containing gas is at least 125 Nm3/t.

Inventors:
SAKAI HIROSHI (JP)
NAKANO KAORU (JP)
Application Number:
PCT/JP2020/044217
Publication Date:
June 03, 2021
Filing Date:
November 27, 2020
Export Citation:
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Assignee:
NIPPON STEEL CORP (JP)
JFE STEEL CORP (JP)
KOBE STEEL LTD (JP)
NIPPON STEEL ENG CO LTD (JP)
International Classes:
C21B5/00
Domestic Patent References:
WO2017134829A12017-08-10
Foreign References:
JPS5887210A1983-05-25
JPH0657315A1994-03-01
Attorney, Agent or Firm:
TANAI Sumio et al. (JP)
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