JPS55113810A - Blast furnace operating method - Google Patents

Blast furnace operating method

Info

Publication number
JPS55113810A
JPS55113810A JP2017179A JP2017179A JPS55113810A JP S55113810 A JPS55113810 A JP S55113810A JP 2017179 A JP2017179 A JP 2017179A JP 2017179 A JP2017179 A JP 2017179A JP S55113810 A JPS55113810 A JP S55113810A
Authority
JP
Japan
Prior art keywords
blast furnace
months
variations
high efficiency
decrease
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
JP2017179A
Other languages
Japanese (ja)
Other versions
JPS5753403B2 (en
Inventor
Mitsuo Yagi
Yasushi Shiotani
Mitsuo Kamata
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nippon Steel Corp
Original Assignee
Nippon Steel Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Nippon Steel Corp filed Critical Nippon Steel Corp
Priority to JP2017179A priority Critical patent/JPS55113810A/en
Publication of JPS55113810A publication Critical patent/JPS55113810A/en
Publication of JPS5753403B2 publication Critical patent/JPS5753403B2/ja
Granted legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21B—MANUFACTURE OF IRON OR STEEL
    • C21B5/00—Making pig-iron in the blast furnace
    • C21B5/006—Automatically controlling the process

Abstract

PURPOSE:To achieve the decrease in blast furnace fuel ratio, the reduction in Si variations in pig iron, etc. over a long period of time, perform high efficiency and stability maintaining operation by executing the reducing blowing-down operation of the blast furnace by taking the timings at which the efficien stable maintenance of the blast furnace changes. CONSTITUTION:When the factors hampering the high efficiency and stable operation maintenance of the blast furnace are occuring, both result in the appearance of the decrease in etaCO [CO2%/(CO%+CO2%)X100 in furnace top gas] and the rise in the variations of [Si]. Because of this, if, for example, the decrease amount of etaCO continues at monthly average 0.3% or more for two months from the nearest three months and/or if the rise amoung of the variations in [Si] in the pig iron occurs at monthly average 0.03% or more for two months from the 3rd month, then the reducing blowing-dowx operation up to the shaft lower part or bosh below the existing fusion zone level of the charging raw material level is done. This is done peiodically with one year, preferably 4-6 months, of the maximum period of this reducing blowing-down time, by which the high efficiency and stable operation of the blast furnace may be maintained.
JP2017179A 1979-02-22 1979-02-22 Blast furnace operating method Granted JPS55113810A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2017179A JPS55113810A (en) 1979-02-22 1979-02-22 Blast furnace operating method

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2017179A JPS55113810A (en) 1979-02-22 1979-02-22 Blast furnace operating method

Publications (2)

Publication Number Publication Date
JPS55113810A true JPS55113810A (en) 1980-09-02
JPS5753403B2 JPS5753403B2 (en) 1982-11-12

Family

ID=12019718

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2017179A Granted JPS55113810A (en) 1979-02-22 1979-02-22 Blast furnace operating method

Country Status (1)

Country Link
JP (1) JPS55113810A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS55115903A (en) * 1979-02-27 1980-09-06 Nippon Steel Corp Wall scaefolding removing method of blast furnace
JP2012021179A (en) * 2010-07-12 2012-02-02 Nippon Steel Corp Method for starting blast furnace after resting blowing

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS55115903A (en) * 1979-02-27 1980-09-06 Nippon Steel Corp Wall scaefolding removing method of blast furnace
JPS5753402B2 (en) * 1979-02-27 1982-11-12
JP2012021179A (en) * 2010-07-12 2012-02-02 Nippon Steel Corp Method for starting blast furnace after resting blowing

Also Published As

Publication number Publication date
JPS5753403B2 (en) 1982-11-12

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