[go: up one dir, main page]

WO2012076707A1 - Procédé permettant d'alimenter en gaz chaud un four à cuve - Google Patents

Procédé permettant d'alimenter en gaz chaud un four à cuve Download PDF

Info

Publication number
WO2012076707A1
WO2012076707A1 PCT/EP2011/072373 EP2011072373W WO2012076707A1 WO 2012076707 A1 WO2012076707 A1 WO 2012076707A1 EP 2011072373 W EP2011072373 W EP 2011072373W WO 2012076707 A1 WO2012076707 A1 WO 2012076707A1
Authority
WO
WIPO (PCT)
Prior art keywords
tuyere
shaft furnace
hot gas
laval type
blowpipe
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.)
Ceased
Application number
PCT/EP2011/072373
Other languages
English (en)
Inventor
Guy Thillen
Lionel Hausemer
Christian De Gruiter
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.)
Paul Wurth SA
Original Assignee
Paul Wurth SA
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 Paul Wurth SA filed Critical Paul Wurth SA
Priority to RU2013131400/02A priority Critical patent/RU2013131400A/ru
Priority to BR112013014354A priority patent/BR112013014354A2/pt
Priority to KR1020137017949A priority patent/KR20140043309A/ko
Priority to EP11802889.3A priority patent/EP2649207A1/fr
Publication of WO2012076707A1 publication Critical patent/WO2012076707A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21B—MANUFACTURE OF IRON OR STEEL
    • C21B7/00—Blast furnaces
    • C21B7/16—Tuyéres
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21B—MANUFACTURE OF IRON OR STEEL
    • C21B7/00—Blast furnaces
    • C21B7/16—Tuyéres
    • C21B7/163—Blowpipe assembly

Definitions

  • the present invention generally relates to a novel method for feeding hot gas, generally blast air, to a shaft furnace, in particular through a plurality of tuyere stocks.
  • pressurized hot gas typically pressurized hot air and generally referred to as "hot blast air"
  • hot blast air is blown into the furnace for the combustion of coke, resulting in CO gas necessary for the reduction of ore in the shaft furnace.
  • a circumferential bustle pipe is arranged in the tuyere band around the outer shell of the shaft furnace, at a certain distance therefrom.
  • the hot gas is fed from the bustle pipe through a plurality of tuyere stocks that blow the hot gas into the shaft furnace.
  • a tuyere stock is generally provided with bellows for compensating for relative movements, which are mainly due to thermal expansions, between the bustle pipe and the shaft furnace.
  • Such a conventional bustle pipe arrangement is e.g. known from WO 86/05520.
  • equal distribution of hot gas may be achieved by providing butterfly valves in the individual tuyere stocks.
  • Such butterfly valves can be individually operated to regulate the flow of hot gas through the respective tuyere stocks.
  • the butterfly valve comprises a disc-shaped control member mounted on a rotation axis centrally arranged in the path of the hot blast. In the closed position, the disc-shaped control member is perpendicular to the flow of hot blast and essentially blocks the path of the hot blast. The control member may then be rotated by 90° into its open position, wherein the control member is essentially parallel to the flow of hot blast, thereby allowing the hot blast to flow through the valve.
  • the flow through the valve can be more or less restricted, thereby achieving a regulation of the flow through the respective tuyere stock.
  • a disadvantage of this method is that the reliability and durability of such butterfly valves is compromised by the exposure to the extreme conditions reigning in the tuyere stocks.
  • the present invention proposes a method for feeding hot gas to a shaft furnace, in particular into a blast furnace.
  • the method comprises providing a tuyere stock arrangement comprising a bustle pipe arranged for receiving hot gas form a gas main and a plurality of tuyere stocks for feeding hot gas from said bustle pipe into said shaft furnace, said tuyere stocks being arranged around the circumference of said shaft furnace, each tuyere stock comprising a downleg section for connection to said bustle pipe, a blowpipe for feeding the hot gas to the shaft furnace through a tuyere arranged in an opening in a shell of the shaft furnace and an elbow arranged between the downleg section and the blowpipe.
  • the method further comprises the step of providing a Laval type restriction in each of the tuyere stocks.
  • Laval type restrictions in the tuyere stocks the uniform distribution of hot gas into a shaft furnace can be more easily achieved. Indeed, there is no need for providing each tuyere stock with a regulation device that has to be individually controlled and that is liable to mechanical failure due to its many, generally complicated, mechanical parts.
  • the Laval type restriction is a durable regulation device that is installed in the tuyere stock and does not need individual control.
  • the Laval type restriction is a nozzle having an asymmetric hourglass-shape with a convergent nozzle entry section and a divergent nozzle exit section and is carefully balanced so as to accelerate the incoming hot gas in the nozzle entry section to reach sonic speed at the nozzle throat and supersonic speed in the nozzle exit section.
  • the pressure drop increases as the square of the mass flow until sound velocity is reached (choked condition). For higher mass flows, the pressure drop increases drastically.
  • the diameter of the tuyere exit is in the same size range as the velocity must be kept in the same range such as to provide a kinetic energy of the stream similar to what it is in the normal configuration. Indeed, the flow rate through the tuyere stock is no longer influenced by what happens in front of the tuyere. Flow conditions in a balanced Laval nozzle only depend on pressure conditions upstream of the Laval nozzle.
  • the flow rate of hot gas into the furnace is adjusted by only varying the pressure conditions at the blower.
  • the Laval type restriction further allows for some of the pressure to be regained, through which, in some cases, the total energy consumption of the blower can be reduced compared to a classic tuyere stock arrangement in which smaller tuyeres may have been arranged in an attempt to reach equal distribution.
  • the Laval type restrictions are operated in sonic behaviour.
  • the repartition of the flow through the different tuyeres is improved.
  • the mass flow is chocked by the Laval type restriction and thus redistributed to the other tuyeres. A more uniform flow through the tuyeres is thus achieved.
  • the method advantageously comprises the step of regulating the mass flow of hot gas through the tuyere stocks by means of a blower arranged upstream of said bustle pipe.
  • the Laval type restriction may, according to an embodiment of the invention, be arranged in the downleg section. Preferably however, the Laval type restriction is arranged in the blowpipe. [0022] According to one embodiment, the Laval type restriction is arranged in a rear end of the blowpipe, in the vicinity of the elbow. According to another embodiment, the Laval type restriction is arranged in a front end of the blowpipe, in the vicinity of the connection to the opening arranged in the shell of the shaft furnace.
  • a tuyere may be arranged in the opening arranged in the shell of the shaft furnace, the blowpipe connecting to the tuyere for blowing hot gas through the tuyere into the shaft furnace.
  • a diffuser may be arranged in the opening arranged in the shell of the shaft furnace, the blowpipe connecting to the diffuser for blowing hot gas through the tuyere into the shaft furnace.
  • Such a diffuser is preferably formed and arranged so as to be an extension of an exit section of the Laval type restriction. Also, downstream of the Laval type restriction, the blowpipe preferably has its inner diameter gradually increasing in such a way as to form an extension of an exit section of the Laval type restriction.
  • Figure 1 is a schematic cut through a tuyere stock arrangement with a tuyere stock according to one embodiment of the present invention
  • Figure 2 is a schematic cut through a Laval type restriction as arranged in the tuyere stock of Figure 1 ;
  • Figure 3 is a schematic cut through a tuyere stock arrangement with a tuyere stock according to another embodiment of the present invention.
  • Figure 4 is a schematic cut through a tuyere stock arrangement with a tuyere stock according to a further embodiment of the present invention.
  • Figure 5 is a schematic top view of a hot gas distribution system for feeding hot gas to a shaft furnace.
  • Figure 6 is a graph showing the results of mass flow through individual tuyeres with and without Laval type restriction arranged in the tuyere stock. Description of Preferred Embodiment
  • Figure 1 shows a tuyere stock arrangement for feeding hot gas, generally hot blast air, through a furnace shell 12.
  • the tuyere stock arrangement comprises a tuyere 14 arranged in the furnace shell 12.
  • the tuyere 14 is maintained in position by a tuyere cooler 16.
  • the tuyere stock arrangement further comprises a tuyere stock 18 for feeding hot gas from a bustle main (not shown) to the tuyere 14.
  • the tuyere 14 has a tuyere body 20 with a front face 24 and an opposite rear face 26.
  • a tuyere channel 28 is centrally arranged through the tuyere body 20 and extends from the rear face 26 to the front face 24.
  • the rear face 26 of the tuyere 14 is configured to receive a front portion 32 of a blowpipe 34, which is connected, with an opposite rear portion 36, generally in the form of an elbow 37, to a downleg section 39, which is, in turn connected to by a bustle pipe 38 (not shown).
  • the blowpipe 34, elbow 37 and downleg section 39 are generally referred to collectively as tuyere stock 18.
  • an auxiliary fuel injection lance may be provided for feeding an auxiliary fuel, generally pulverized coal or natural gas, into the shaft furnace at the tuyere level. Due to the injection of the fuel into the shaft furnace the amount of coke fed into the furnace can be reduced. As fuel, such as e.g. coal, is generally cheaper than coke, this leads to a reduction in running costs of the shaft furnace. Generally, such auxiliary fuel is fed into the stream of hot gas within the tuyere 14 or the blowpipe 34. Further, in order to promote the combustion of the auxiliary fuel, gas injection lances (not shown) may be provided for feeding oxidizing gas, such as oxygen, to the fuel.
  • oxidizing gas such as oxygen
  • Combined lances may be used to feed auxiliary fuel and oxidizing gas into the tuyere 14 or blowpipe 34 may be used.
  • Such combined lances generally referred to as oxycoal lances, use two concentric pipes for separately feeding auxiliary fuel and oxidizing gas to the tip of the combined lance.
  • a Laval type restriction 40, 40', 40" is arranged in the tuyere stock 18.
  • FIG. 1 shows one embodiment of the present invention, wherein a Laval type restriction 40 is arranged in the downleg section 39 of the tuyere stock 18.
  • a Laval type restriction 40 is, as is more clearly shown in Figure 2, a nozzle having an asymmetric hourglass-shape with a convergent nozzle entry section 42, a nozzle throat 44 and a divergent nozzle exit section 46.
  • the nozzle is carefully balanced so as to accelerate the incoming hot gas in the nozzle entry section 42, to reach sonic speed at the nozzle throat 44 and supersonic speed in the nozzle exit section 46.
  • the portion of the tuyere stock 18 downstream of the Laval type restriction 40 may have flow channels with a diameter larger than those generally used today.
  • the front diameter of the tuyere need however not be changed.
  • the pressure drop for equal distribution happens in the Laval type restriction 40 and the flow rates of hot gas through the tuyere stock 18 is not influenced by conditions downstream of the Laval type restriction 40.
  • Figure 3 shows another embodiment of the present invention, with an alternative arrangement for a Laval type restriction 40'. Most of the features of this embodiment are identical to the embodiment shown in Figure 1 and will therefore not be explained in further detail herebelow. Identical references signs refer to identical features.
  • a Laval type restriction 40' is arranged in a rear portion 36 of the blowpipe 34, in the vicinity of the elbow 37.
  • the Laval type restriction 40' itself is very similar to the Laval type restriction 40 of Figure 1 or 2.
  • Its divergent nozzle exit section 46' is arranged and configured so as to diverge in such a way as to create a continuously diverging channel leading into the shaft furnace.
  • the blowpipe 34 has its central channel 48 therein formed so as to conform to the continuously diverging channel.
  • the front portion 32 of the blowpipe 34 contacts a rear face of a diffuser 50 arranged in the shell 12 the shaft furnace.
  • Such a diffuser 50 has a central channel 52 formed so as to conform to the continuously diverging channel.
  • Figure 4 shows a further embodiment of the present invention, with an alternative arrangement for Laval type restriction 40".
  • Most of the features of this embodiment are identical to the embodiment shown in Figure 3 and will therefore not be explained in further detail herebelow.
  • Identical references signs refer to identical features.
  • a Laval type restriction 40" is arranged in a front portion 32 of the blowpipe 34, in the vicinity of the connection to the opening arranged in the shell 12 of the shaft furnace.
  • the Laval type restriction 40" itself is again very similar to the Laval type restriction 40 of Figure 1 or 2.
  • Its divergent nozzle exit section 46" however is arranged and configured so as to diverge in such a way as to create a continuously diverging channel leading into the shaft furnace.
  • the blowpipe 34 has its central channel 48 therein formed so as to conform to the continuously diverging channel.
  • the front portion 32 of the blowpipe 34 contacts a rear face of a diffuser 50 arranged in the shell 12 the shaft furnace.
  • Such a diffuser 50 has a central channel 52 formed so as to conform to the continuously diverging channel.
  • FIG. 5 shows a hot gas distribution system 54 for feeding hot gas to a shaft furnace.
  • the hot gas distribution system 54 comprises a circumferential bustle pipe 56 arranged around the outer shell of the shaft furnace, at a certain distance therefrom.
  • the bustle pipe 56 receives hot gas from a gas main 58 and redistributes it around the shaft furnace.
  • the hot gas is then fed from the bustle pipe 56 through a plurality of tuyere stocks 18 into the shaft furnace. From the Figure, it appears that the tuyere stocks 18 in proximity to the gas main 58 tend to receive more hot gas than the tuyere stocks 18 that are located further away from the gas main 58.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Manufacture Of Iron (AREA)
  • Blast Furnaces (AREA)

Abstract

La présente invention se rapporte à un procédé permettant d'alimenter en gaz chaud un four à cuve, en particulier un haut-fourneau. Le procédé consiste à utiliser un agencement de blocs de tuyères comprenant une conduite circulaire (56) agencée pour recevoir un gaz chaud provenant d'une conduite de gaz (58), et une pluralité de blocs de tuyères (18) pour fournir le gaz chaud provenant de ladite conduite circulaire (56) dans ledit four à cuve, lesdits blocs de tuyères (18) étant agencés autour de la circonférence dudit four à cuve, chaque bloc de tuyères (18) comprenant une section descendante (39) permettant une connexion à une conduite circulaire ; une lance à soufflage (34) pour alimenter en gaz chaud le four à cuve au moyen d'une tuyère agencée dans une ouverture de la carcasse (12) du four à cuve ; et un coude (37) agencé entre la section descendante (39) et la lance à soufflage (34). Selon un aspect de l'invention, une section de restriction de type Laval (40, 40', 40'') est agencée dans le bloc de tuyères (18).
PCT/EP2011/072373 2010-12-10 2011-12-09 Procédé permettant d'alimenter en gaz chaud un four à cuve Ceased WO2012076707A1 (fr)

Priority Applications (4)

Application Number Priority Date Filing Date Title
RU2013131400/02A RU2013131400A (ru) 2010-12-10 2011-12-09 Способ подачи горячего газа в шахтную печь
BR112013014354A BR112013014354A2 (pt) 2010-12-10 2011-12-09 método de suprimento de gás quente a um forno de cuba
KR1020137017949A KR20140043309A (ko) 2010-12-10 2011-12-09 용광로에 열가스를 주입하기 위한 방법
EP11802889.3A EP2649207A1 (fr) 2010-12-10 2011-12-09 Procédé permettant d'alimenter en gaz chaud un four à cuve

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
LU91764A LU91764B1 (en) 2010-12-10 2010-12-10 Tuyere stock of a shaft furnace and hot gas distribution system comprising a plurality of such tuyere stocks
LU91764 2010-12-10

Publications (1)

Publication Number Publication Date
WO2012076707A1 true WO2012076707A1 (fr) 2012-06-14

Family

ID=43533328

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2011/072373 Ceased WO2012076707A1 (fr) 2010-12-10 2011-12-09 Procédé permettant d'alimenter en gaz chaud un four à cuve

Country Status (6)

Country Link
EP (1) EP2649207A1 (fr)
KR (1) KR20140043309A (fr)
BR (1) BR112013014354A2 (fr)
LU (1) LU91764B1 (fr)
RU (1) RU2013131400A (fr)
WO (1) WO2012076707A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20230163821A (ko) 2022-05-24 2023-12-01 (주)달성 고로용 송풍지관

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2288282A1 (fr) * 1974-10-15 1976-05-14 Siderurgie Fse Inst Rech Tuyere pour l'injection de combustible auxiliaire dans les fours a cuve
GB1591318A (en) * 1976-07-23 1981-06-17 Arbed Injection of combustibles into a blast furnace
JPS56150107A (en) * 1980-04-21 1981-11-20 Nippon Kokan Kk <Nkk> Controlling method of blast amount at blast furnace tuyere
WO1986005520A1 (fr) 1985-03-14 1986-09-25 British Steel Corporation Fabrication de fer amelioree dans un four de fusion a cuve
JPS63145847U (fr) * 1987-03-16 1988-09-27
JPH0995720A (ja) 1995-10-03 1997-04-08 Azuma Tekko Kk 熱風制御弁
JP2002241818A (ja) 2001-02-20 2002-08-28 Azuma Tekko Kk 熱風制御弁
WO2009141419A1 (fr) * 2008-05-23 2009-11-26 Paul Wurth S.A. Procédé pour fournir du charbon pulvérisé dans un haut-fourneau

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US966704A (en) * 1906-08-17 1910-08-09 John Pickles Oil-burning twyer.

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2288282A1 (fr) * 1974-10-15 1976-05-14 Siderurgie Fse Inst Rech Tuyere pour l'injection de combustible auxiliaire dans les fours a cuve
GB1591318A (en) * 1976-07-23 1981-06-17 Arbed Injection of combustibles into a blast furnace
JPS56150107A (en) * 1980-04-21 1981-11-20 Nippon Kokan Kk <Nkk> Controlling method of blast amount at blast furnace tuyere
WO1986005520A1 (fr) 1985-03-14 1986-09-25 British Steel Corporation Fabrication de fer amelioree dans un four de fusion a cuve
JPS63145847U (fr) * 1987-03-16 1988-09-27
JPH0995720A (ja) 1995-10-03 1997-04-08 Azuma Tekko Kk 熱風制御弁
JP2002241818A (ja) 2001-02-20 2002-08-28 Azuma Tekko Kk 熱風制御弁
WO2009141419A1 (fr) * 2008-05-23 2009-11-26 Paul Wurth S.A. Procédé pour fournir du charbon pulvérisé dans un haut-fourneau

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See also references of EP2649207A1

Also Published As

Publication number Publication date
BR112013014354A2 (pt) 2016-09-27
EP2649207A1 (fr) 2013-10-16
RU2013131400A (ru) 2015-01-20
LU91764B1 (en) 2012-06-11
KR20140043309A (ko) 2014-04-09

Similar Documents

Publication Publication Date Title
JP4309476B2 (ja) 反応ガスおよび固体の溶鉱炉内への供給および方向制御の方法ならびに前記目的に沿って設計された多重調整可能なバーナー
JP5788885B2 (ja) 浮遊溶解炉の反応シャフトに燃料ガスを供給する方法および精鉱バーナ
CN101371077B (zh) 燃烧煤粉的锅炉和煤粉燃烧方法
CN102918346B (zh) 鼓风炉的风口弯头装置
US20130146680A1 (en) Injection lance with variable swirl
EP1832664A1 (fr) Injecteur de combustible fossile à tourbillon oxydant pour four vertical
CN1242829A (zh) 将燃料引入到窑炉内的方法和烧嘴
JP5194504B2 (ja) 高炉への気体還元材吹込装置及びこれを用いた高炉の操業方法
KR20090099538A (ko) 용광로에서 선철을 제조하기 위한 방법
EP2649207A1 (fr) Procédé permettant d&#39;alimenter en gaz chaud un four à cuve
US20080092789A1 (en) Burner structure
JP5262018B2 (ja) 羽口リングおよび羽口リングを設置した高炉羽口
CN105793648B (zh) 周向喷射燃烧器
JPS62142706A (ja) 高炉内への粉粒体吹込み方法
JP3411620B2 (ja) 溶鉱炉に供給する反応ガスの供給の調節方法、およびその装置
US3322348A (en) Apparatus for the treatment of metal melts with gases
JP4557156B2 (ja) 高炉への還元性ガス吹込装置
CN103687965A (zh) 熔融还原设备和用于运行熔融还原设备的方法
CN207159255U (zh) 一种高炉煤粉喷头
US20070290418A1 (en) Tuyere For Oxygen Blast Furnace Converter System
JP6056346B2 (ja) 高炉の気体還元材吹込み装置及び高炉の操業方法
JP5064086B2 (ja) 高炉操業方法
KR200282937Y1 (ko) 환원로 중심부의 장입물 배출장치_
CN220471671U (zh) 一种水泥窑及脱销系统煤粉分配均衡装置
CN107312898A (zh) 一种高炉煤粉喷头

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 11802889

Country of ref document: EP

Kind code of ref document: A1

REEP Request for entry into the european phase

Ref document number: 2011802889

Country of ref document: EP

WWE Wipo information: entry into national phase

Ref document number: 2011802889

Country of ref document: EP

NENP Non-entry into the national phase

Ref country code: DE

ENP Entry into the national phase

Ref document number: 20137017949

Country of ref document: KR

Kind code of ref document: A

ENP Entry into the national phase

Ref document number: 2013131400

Country of ref document: RU

Kind code of ref document: A

REG Reference to national code

Ref country code: BR

Ref legal event code: B01A

Ref document number: 112013014354

Country of ref document: BR

ENP Entry into the national phase

Ref document number: 112013014354

Country of ref document: BR

Kind code of ref document: A2

Effective date: 20130610