EP0273420A2 - Méthode pour un haut fourneau - Google Patents

Méthode pour un haut fourneau Download PDF

Info

Publication number
EP0273420A2
EP0273420A2 EP87119248A EP87119248A EP0273420A2 EP 0273420 A2 EP0273420 A2 EP 0273420A2 EP 87119248 A EP87119248 A EP 87119248A EP 87119248 A EP87119248 A EP 87119248A EP 0273420 A2 EP0273420 A2 EP 0273420A2
Authority
EP
European Patent Office
Prior art keywords
blast furnace
blow
gas
inlets
level
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
EP87119248A
Other languages
German (de)
English (en)
Other versions
EP0273420A3 (en
EP0273420B1 (fr
Inventor
Yotaro c/o Nippon Kokan KK Oono
Hirohisa c/o Nippon Kokan KK Hotta
Kazumasa c/o Nippon Kokan KK Wakimoto
Hitoshi c/o Nippon Kokan KK Kawada
Kazuhiko c/o Nippon Kokan KK Tsujimoto
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.)
JFE Engineering Corp
Original Assignee
Nippon Kokan Ltd
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
Priority claimed from JP30913386A external-priority patent/JPH0619090B2/ja
Priority claimed from JP62000222A external-priority patent/JPS63169312A/ja
Priority claimed from JP62001853A external-priority patent/JPS63171815A/ja
Application filed by Nippon Kokan Ltd filed Critical Nippon Kokan Ltd
Publication of EP0273420A2 publication Critical patent/EP0273420A2/fr
Publication of EP0273420A3 publication Critical patent/EP0273420A3/en
Application granted granted Critical
Publication of EP0273420B1 publication Critical patent/EP0273420B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21B—MANUFACTURE OF IRON OR STEEL
    • C21B7/00—Blast furnaces
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21B—MANUFACTURE OF IRON OR STEEL
    • C21B5/00—Making pig-iron in the blast furnace

Definitions

  • the present invention relates to a blast furnace for iron-making, and more particularly, to blowing-in of preheating gas to preheat burdens introduced into a blast furnace.
  • a blast furnace which comprises: a blast furnace body; tuyeres set in a lower part of the blast furnace body through which tuyeres gas of 40 vol.% or more oxygen is blown in; and blow-in inlets for preheating gas set in a range of 0.15 to 0.60 downward from a stock line where a distance between the stock line and a level of a tuyere nose is equal to 1.0.
  • Fig. 1 shows a vertical sectional view illustrating a blast furnace of the present invention.
  • Burdens composed of iron ores, cokes and fluxes are charged into blast furnace until they pile up to a predetermined level of stock line 14.
  • Tuyeres 12 are set in blast furnace body 11. Through tuyeres 12, gas of 40 vol.% or more oxygen, pulverized coal and flame temperature control agent are blown in into the blast furnace.
  • Blow-in inlets 13 for introducing preheat gas are set in a level at 0.50 apart from the stock line where a distance from the stock line through the level of the tuyeres is equal to 1.0.
  • the blow-in inlets constitute a set consisting of sixteen inlets set in a single level, and have a downward slope with an angle of 25° with respect to the horizontal level.
  • preheating gas is introduced into the blast furnace to preheat the burdens.
  • the gas of 40 vol.% or more oxygen blown in allows cokes and pulverized coal to combust perfectly and thanks to the generated high temperature reduction gas, iron ores are melted and reduced to pig iron and slag.
  • Fig. 2 is a horizontal end view taken on line II-II in Fig. 1.
  • 16 blow-in inlets 13 are set, in an equal interval, one another on the peripheral circle.
  • the position of blow-in inlets is set at the level of 0.50 downward from a stock line where a distance between the stock line and a level of the tuyere nose equals 1.0.
  • the position can be set at any point of a range of 0.15 to 0.60 downward from the stock line.
  • the position range is preferably 0.30 to 0.55 from the stock line.
  • Fig. 3 graphically represent relation of a relative position of blow-in inlets 13, to a fuel ratio in blast furnace operation.
  • a ratio of a distance from a stock line to a position of the blow-­in inlets is shown where a distance between the stock line and the level of the tuyere nose equals 1.0.
  • Fig. 4 graphically shows relation of a relative position of blow-in inlets 13, for introducing preheating gas to Si content in molten pig iron.
  • a ratio of a distance between a stock line and a position of the blow-in inlets is shown where a distance from the stock line and the level of the blow-in inlets equals 1.0.
  • blow-in inlets When the blow-in inlets are set in a position of less than 0.15 or more than 0.60 from the stock line, it is impossible to maintain a stable blast furnace operation throughout a long period unless the blast furnace is operated at a fuel ratio of more than 700 kg/ton., molten pig iron.
  • the position of the blow-in inlets for preheating gas ranges is preferably 0.33 to 0.55 downward from the stock line. This range reduces further not only the fuel ratio but also the Si content in molten iron.
  • Preheating gas is blown-in, based on the results of measuring burden temperature or gas temperature by means of probes provided within the intermediate portion of the furnace shaft.
  • the blow-in of the preheating gas is blown in through a single level or multiple levels of the blown-in inlets.
  • blow-in inlets of each level set in peripheral circle of the furnace wall are divided into some zone groups, and then, if gas amount and gas temperature is varied simultaneously between an upper group and a lower zone group which are vertically positioned in the same zone, the effect in preheating comes out by far quicker than in the case of the blowing control through the single-level of the blow-in inlets.
  • each of the blow-in inlets is positioned so that they are staggered parallel to one another in relation to up and down levels in view of allowing gas to flow up uniformly along the periphery of the furnace wall.
  • blow-in inlets of every level are not specifically limited in number. 8 to 18 of blow-in inlets are preferable so as to allow gas constituent and temperature prevailing near the furnace wall to become almost homogeneous in the vicinity of the stock line level. Furthermore, it is preferable if the different levels of the blow-in inlets are 1 to 4 levels in number.
  • an angle of downward slope of the blow-in inlets to be set in the blast furnace body is larger than a repose angle of burdens. This is because powdery particles of burdens block openings of the blow-in inlets.
  • the downward slope of the blow-in inlets into the in-furnace with regard to the horizontal level is preferably in the range 20 to 50°. If the downward slope is less than 20°, the powdery particles of burdens block the openings of the blow-in inlets. On the other hand, it is useless to let the downward slope be more than 50°, considering that the repose angle of the burdens is 45 to 50° at the most. In addition, more than 50° downward slope is undesirable in view of protecting a furnace body, since, due to this obtuse angle, blow-in holes become large.
  • One is a method wherein preheating gas is generated, by means of furnace top gas generated from a blast furnace and oxygen, in a combustion furnace built in the neighbourhood of the blast furnace.
  • preheating gas is generated, by means of furnace top gas generated from a blast furnace and oxygen, in a combustion furnace built in the neighbourhood of the blast furnace.
  • hot blast leading pipe is allowed to go up to the furnace shaft level and still to connect to a fireproofed heavy ring-shaped pipe, which are further connected, by means of a manifold to every blow-in inlet.
  • gas burners having a fuel gas supply pipe, an oxygen supply pipe and a gas temperature control gas supply pipe are set at the blow-in inlets to introduce preheating gas into the blast furnace. Every burner independently controls temperature and amount of preheating gas by controlling fuel gas amount and oxygen gas amount. Those transfer pipes leading to the burners are not required to be fireproofed.
  • a burner is set at every blow-in inlet and gas temperature and amount can be freely and simply controlled at every of the blow-in inlets. Furthermore, there is no need for laying a heavy ring-shaped hot blast pipe on the furnace shaft. In operation, quick response to movement of furnace conditions can be practiced.
  • Fig. 5 schematically illustrates a sectional view of a burner to be used for the present invention.
  • Either of fuel gas supply pipe 21 and oxygen supply pipe 22 is connected to burner body 28 in such a manner as gas flow amount can be freely controlled.
  • Pilot burner 29 is set at a portion where oxygen jets out.
  • the outer side of the burner body is covered with sheet iron shell.
  • Gas supply pipe 25 is also jointed to burner body 28 for controlling freely temperature of gas generated in the burner.
  • Pipes for cooling water are composed of water feed pipe 23 and water drain pipe 24.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Manufacture Of Iron (AREA)
  • Vertical, Hearth, Or Arc Furnaces (AREA)
  • Waste-Gas Treatment And Other Accessory Devices For Furnaces (AREA)
  • Blast Furnaces (AREA)
  • Furnace Details (AREA)
EP87119248A 1986-12-27 1987-12-28 Méthode pour un haut fourneau Expired - Lifetime EP0273420B1 (fr)

Applications Claiming Priority (6)

Application Number Priority Date Filing Date Title
JP309133/86 1986-12-27
JP30913386A JPH0619090B2 (ja) 1986-12-27 1986-12-27 酸素高炉
JP222/87 1987-01-06
JP62000222A JPS63169312A (ja) 1987-01-06 1987-01-06 酸素高炉の構造
JP62001853A JPS63171815A (ja) 1987-01-09 1987-01-09 酸素高炉
JP1853/87 1987-01-09

Publications (3)

Publication Number Publication Date
EP0273420A2 true EP0273420A2 (fr) 1988-07-06
EP0273420A3 EP0273420A3 (en) 1988-08-03
EP0273420B1 EP0273420B1 (fr) 1993-09-22

Family

ID=27274356

Family Applications (1)

Application Number Title Priority Date Filing Date
EP87119248A Expired - Lifetime EP0273420B1 (fr) 1986-12-27 1987-12-28 Méthode pour un haut fourneau

Country Status (5)

Country Link
EP (1) EP0273420B1 (fr)
KR (1) KR930004473B1 (fr)
CN (1) CN1007161B (fr)
AU (1) AU596253B2 (fr)
DE (1) DE3787518T2 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2410065A4 (fr) * 2009-04-30 2017-06-07 JFE Steel Corporation Procédé d'utilisation de haut-fourneau
JP2024541772A (ja) * 2021-12-03 2024-11-12 昌黎県興国精密机件有限公司 高炉低炭素製錬のための吹込み制御装置及び方法

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4844737A (en) * 1986-12-27 1989-07-04 Nippon Kokan Kabushiki Kaisha Method for operating a blast furnance by blowing pulverized coal
KR100826963B1 (ko) * 2001-11-13 2008-05-02 주식회사 포스코 고로 노심온도 관리 방법
JP4697340B2 (ja) * 2009-05-29 2011-06-08 Ｊｆｅスチール株式会社 高炉操業方法

Family Cites Families (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE763817C (de) * 1939-03-21 1954-07-12 Thyssen Sche Gas U Wasserwerke Verfahren zum Verhuetten von mit festem Brennstoff und Zuschlaegen vermischten Eisenerzen im Hochofen
DE743376C (de) * 1939-05-20 1944-01-11 Roechlingsche Eisen & Stahl Verfahren zur Verhuettung von Eisenerzen
FR869065A (fr) * 1940-01-13 1942-01-23 Lindes Eismaschinen Ag Procédé de traitement de minerai
CH254586A (de) * 1947-01-17 1948-05-15 Von Roll Ag Verfahren und Ofen zum Verhütten von Eisenerz mit einem an Sauerstoff angereicherten Wind.
US2593257A (en) * 1948-08-26 1952-04-15 Standard Oil Dev Co Blast furnace operation
GB668218A (en) * 1948-12-14 1952-03-12 Bleloch William Improvements in the smelting of metallic oxides in a blast furnace
GB674546A (en) * 1949-05-19 1952-06-25 Ruhrgas Ag Process for the simultaneous production of metals and rich gas
US3423080A (en) * 1963-11-06 1969-01-21 Interlake Steel Corp Electric arc furnace
US3364009A (en) * 1964-03-12 1968-01-16 Kemmetmuller Roland Method for the production of iron and steel
FR2156456A1 (en) * 1971-10-20 1973-06-01 Nippon Kokan Kk Blast furnace combined operation - by blowing a reducing gas and an oxygen enriched flux
BE817647R (fr) * 1974-07-15 1974-11-04 Bruleur reducteur de haut fourneau ou toutes autres utilisations calorifiques reductrices
US4844737A (en) * 1986-12-27 1989-07-04 Nippon Kokan Kabushiki Kaisha Method for operating a blast furnance by blowing pulverized coal

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2410065A4 (fr) * 2009-04-30 2017-06-07 JFE Steel Corporation Procédé d'utilisation de haut-fourneau
JP2024541772A (ja) * 2021-12-03 2024-11-12 昌黎県興国精密机件有限公司 高炉低炭素製錬のための吹込み制御装置及び方法

Also Published As

Publication number Publication date
KR930004473B1 (ko) 1993-05-27
CN87105991A (zh) 1988-07-27
DE3787518T2 (de) 1994-03-10
AU8294687A (en) 1988-06-30
KR880007746A (ko) 1988-08-29
DE3787518D1 (de) 1993-10-28
EP0273420A3 (en) 1988-08-03
EP0273420B1 (fr) 1993-09-22
CN1007161B (zh) 1990-03-14
AU596253B2 (en) 1990-04-26

Similar Documents

Publication Publication Date Title
US5065985A (en) Method for smelting reduction of iron ore and apparatus therefor
US4356035A (en) Steelmaking process
US4988079A (en) Apparatus for smelting and reducing iron ores
EP0659887B1 (fr) Procédé de réduction par fusion pour la fabrication de la fonte dans le convertisseur
US5632953A (en) Process and device for melting iron metallurgical materials in a coke-fired cupola
EP0273420B1 (fr) Méthode pour un haut fourneau
JPH0776713A (ja) 移動層型スクラップ溶融炉の操業方法
JP2918646B2 (ja) 溶融還元炉
US3759699A (en) Ting means process for melting scrap with a plurality of oppositely directed hea
CA1318134C (fr) Methode de transfert de chaleur a du metal en fusion, et appareil connexe
JPH08506858A (ja) 鉄を製造する方法と装置
JPS63171815A (ja) 酸素高炉
US6352574B1 (en) Process for direct production of cast iron from fine iron ore and fine coal
US4462825A (en) Method for increasing the scrap melting capability of metal refining processes
US3088821A (en) Open hearth steelmaking process
CS216843B2 (en) Method of ammeliorating the exploitation of heat by making the steels from hard iron mateials
US3722871A (en) Blast furnace with staggered tuyere system
CN100489116C (zh) 用于改善对废料块的能量供给的方法
RU2151197C1 (ru) Способ выплавки чугуна и агрегат для его осуществления
CN2242248Y (zh) 双层热风熔炼炉
RU2163641C1 (ru) Способ задувки доменной печи
JP2002060859A (ja) 精鉱バーナー
RU1770695C (ru) Вагранка
Campbell Pueblo’s Oxygen Steelmaking Operations
SU1191708A1 (ru) Вагранка

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

PUAL Search report despatched

Free format text: ORIGINAL CODE: 0009013

17P Request for examination filed

Effective date: 19871228

AK Designated contracting states

Kind code of ref document: A2

Designated state(s): DE FR GB IT

AK Designated contracting states

Kind code of ref document: A3

Designated state(s): DE FR GB IT

17Q First examination report despatched

Effective date: 19900817

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

AK Designated contracting states

Kind code of ref document: B1

Designated state(s): DE FR GB IT

ITF It: translation for a ep patent filed
REF Corresponds to:

Ref document number: 3787518

Country of ref document: DE

Date of ref document: 19931028

ET Fr: translation filed
PLBE No opposition filed within time limit

Free format text: ORIGINAL CODE: 0009261

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT

26N No opposition filed
PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: FR

Payment date: 19981209

Year of fee payment: 12

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: GB

Payment date: 19981231

Year of fee payment: 12

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: DE

Payment date: 19990107

Year of fee payment: 12

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: GB

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 19991228

GBPC Gb: european patent ceased through non-payment of renewal fee

Effective date: 19991228

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: FR

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20000831

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: DE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20001003

REG Reference to a national code

Ref country code: FR

Ref legal event code: ST

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: IT

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES;WARNING: LAPSES OF ITALIAN PATENTS WITH EFFECTIVE DATE BEFORE 2007 MAY HAVE OCCURRED AT ANY TIME BEFORE 2007. THE CORRECT EFFECTIVE DATE MAY BE DIFFERENT FROM THE ONE RECORDED.

Effective date: 20051228