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WO2013045534A1 - Procédé et système de dispositifs pour la réduction de la température de pics de température d'un gaz de haut fourneau - Google Patents

Procédé et système de dispositifs pour la réduction de la température de pics de température d'un gaz de haut fourneau Download PDF

Info

Publication number
WO2013045534A1
WO2013045534A1 PCT/EP2012/069051 EP2012069051W WO2013045534A1 WO 2013045534 A1 WO2013045534 A1 WO 2013045534A1 EP 2012069051 W EP2012069051 W EP 2012069051W WO 2013045534 A1 WO2013045534 A1 WO 2013045534A1
Authority
WO
WIPO (PCT)
Prior art keywords
dedusting device
blast
blast furnace
furnace gas
pressure
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/EP2012/069051
Other languages
English (en)
Inventor
Andreas Hackl
Andreas KLUGSBERGER
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.)
SIEMENS VAI METALS TECHNOLOGIES GmbH
Primetals Technologies Austria GmbH
Original Assignee
SIEMENS VAI METALS TECHNOLOGIES GmbH
Siemens VAI Metals Technologies GmbH Austria
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 SIEMENS VAI METALS TECHNOLOGIES GmbH, Siemens VAI Metals Technologies GmbH Austria filed Critical SIEMENS VAI METALS TECHNOLOGIES GmbH
Publication of WO2013045534A1 publication Critical patent/WO2013045534A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27B—FURNACES, KILNS, OVENS OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
    • F27B1/00—Shaft or like vertical or substantially vertical furnaces
    • F27B1/10—Details, accessories or equipment specially adapted for furnaces of these types
    • F27B1/18—Arrangements of dust collectors
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21B—MANUFACTURE OF IRON OR STEEL
    • C21B7/00—Blast furnaces
    • C21B7/002—Evacuating and treating of exhaust gases
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21B—MANUFACTURE OF IRON OR STEEL
    • C21B7/00—Blast furnaces
    • C21B7/007—Controlling or regulating of the top pressure
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21B—MANUFACTURE OF IRON OR STEEL
    • C21B7/00—Blast furnaces
    • C21B7/24—Test rods or other checking devices
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27B—FURNACES, KILNS, OVENS OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
    • F27B1/00—Shaft or like vertical or substantially vertical furnaces
    • F27B1/10—Details, accessories or equipment specially adapted for furnaces of these types
    • F27B1/28—Arrangements of monitoring devices, of indicators, of alarm devices
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D17/00—Arrangements for using waste heat; Arrangements for using, or disposing of, waste gases
    • F27D17/20—Arrangements for treatment or cleaning of waste gases
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D17/00—Arrangements for using waste heat; Arrangements for using, or disposing of, waste gases
    • F27D17/30—Arrangements for extraction or collection of waste gases; Hoods therefor
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21B—MANUFACTURE OF IRON OR STEEL
    • C21B2100/00—Handling of exhaust gases produced during the manufacture of iron or steel
    • C21B2100/60—Process control or energy utilisation in the manufacture of iron or steel
    • C21B2100/64—Controlling the physical properties of the gas, e.g. pressure or temperature

Definitions

  • the present invention relates to a method and a device for decreasing the temperature of blast-furnace gas temperature peaks.
  • peaks of temperature of the blast furnace gas can occur. Such peaks of temperature, which can reach up to 1300°C, can be caused by several kinds of events in the blast furnace. For example, occurrence of peaks of temperature of the blast furnace gas is facilitated when grain sizes of the blast furnace burden segregate during charging of the blast furnace. At the angle of repose of the burden coarse grain of the burden rolls towards the centre of the blast furnace, while fine grain stays near the wall of the blast furnace shaft. The more coarse grain is present in a region of the blast furnace, the more flow-channels are available for gas streaming upwards through this region - accordingly, in those regions upstreaming gas meets less resistance and streams faster.
  • blast-furnace gas may exit the burden with a temperature of more than 600°C, usually 1000°C or more than 1000°C, this blast-furnace gas being under a pressure much increased compared to normal operation of the blast furnace, which leads to opening of the bleeder valves at the top of the furnace.
  • Another situation which leads to peaks of temperature of the blast furnace gas is collapsing of bridges of melting ore burden which have been formed during descending of the blast furnace's burden.
  • While the devices for diverting and for treating of the blast-furnace gas which accompany a blast furnace are mainly designed to cope with temperature and pressure occurring during normal operation of the blast furnace, in case of a peak of temperature and pressure of the blast-furnace gas these parameters are above the levels of normal operation.
  • the high temperature of the blast-furnace gas in case of a peak may lead to overheating of the blast furnace's upper parts and of the devices for diverting and for treating - e.g. purifying - of the blast-furnace gas.
  • the permitted maximum pressure in the blast furnace system may be exceeded by the pressure peak, necessitating to relieve pressure by a means for relieving pressure - which is called bleeder -, into the atmosphere. This results in pollution of the atmosphere, especially by carbon monoxide and dust.
  • the pressure of the blast-furnace gas is being measured continuously, and injection of water into the blast-furnace gas is triggered off when a threshold value for the pressure is exceeded,
  • Measuring of the pressure of the blast-furnace gas according to the invention permits diagnosing development of a slip at an early stage before a distinctive rise of temperature occurs.
  • a threshold value for the pressure is exceeded injection of water into the blast-furnace gas is triggered off.
  • actions for decreasing temperature and smoothing temperature peaKs are taKen earner when compared to off-take temperature-monitoring based slip detection.
  • the pressure of blast-furnace gas during normal operation depends on the type of construction and on the blast furnace's mode of operation. Consequently, in each case a different threshold value is characteristic for the development of a slip.
  • the threshold value for the pressure of the blast-furnace gas is set by the blast furnace's operator according to the conditions in the respective blast furnace.
  • the injection of water is carried out in at least one member of the group consisting of the three members
  • the furnace throat is the upper part of the blast furnace where material is charged into the furnace. It ends where the off-takes begin and it starts at the upper level of the burden material inside the furnace.
  • the first dedusting device may be followed by a second, e.g. less heat resistant, dedusting device, to which the blast furnace gas is led via pipes.
  • a second dedusting device e.g. less heat resistant, dedusting device
  • injection of water in such pipes keeps exposition of the second dedusting device to the hot blast furnace gas small.
  • the second dedusting device may be followed by a further, e.g. less heat resistant, dedusting device, to which the blast furnace gas is led via pipes.
  • a further dedusting device e.g. less heat resistant, dedusting device
  • An embodiment of the present invention is injection or water Deing carried out in pipes through which the blast furnace gas is diverted from the first dedusting device where a first step of dedusting, e.g. coarse dedusting, takes place, to any further dedusting device where subsequent steps of dedusting take place prior to the blast furnace gas joining a common system.
  • the expression common system refers to the blast furnace gas distribution network, into which the gas joins after it has been cleaned by the various dedusting stages.
  • the gas from the furnace can be combined in this system with cleaned gas from other blast furnaces on the site, hence the system is common to all the furnaces - leading to the expression common system.
  • the pressure of the blast-furnace gas is being measured in the off-takes through which blast-furnace gas is diverted from the blast furnace. According to another embodiment of the invention the pressure of the
  • blast-furnace gas is being measured upstream of the off-takes in the direction of flow of the blast furnace gas. Thereby, earlier detection of a peak of temperature is possible.
  • the direction of flow of the blast furnace gas is from the burden to the offtakes.
  • the pressure of the blast-furnace gas may be measured in the area of the blast furnace's furnace throat.
  • the first dedusting device is a
  • dry dedusting device preferably cyclone or dust catcher
  • a dustcatcher is a coarse dust separation device using gravity forces and low velocities for dust separation. In comparison the cyclone uses centrifugal forces for dust separation.
  • it is a dry dedusting device.
  • the further dedusting device is a member of the group containing - dry dedusting device, preferably Dag-niter,
  • a further object of the invention is a
  • the means for measuring the pressure comprises probes in the off-takes through which blast-furnace gas is diverted from the blast furnace.
  • tne means Tor measuring tne pressure comprises probes in the area of the blast furnace's furnace throat.
  • the means for injection of water comprises injection nozzles in the area of the blast furnace's throat.
  • the nozzles belong to one or several of the nozzle-types in the group - spillback nozzle,
  • Spillback nozzles and twin fluid nozzles are especially preferred due to the fine water droplets which can be produced.
  • Twin fluid nozzles are especially favourable since due to the water's atomisation with gas like compressed air or nitrogen the amount of water injected per time unit can be changed very quickly, which allows to react quickly when conditions in the blast furnace gas change. Hence, too little or too much cooling of the blast furnace gas can be avoided.
  • the nozzles belonging to one or several of the nozzle-types in the group are nozzles belonging to one or several of the nozzle-types in the group.
  • a typical spiral nozzle has a d90 of about 1000 ⁇ ; a typical spillback nozzle has a d90 of about 600 ⁇ ; a typical twin fluid nozzle has a d90 of about 150- 200 m. According to one embodiment of the invention
  • the first dedusting device is a
  • - dry dedusting device preferably cyclone or dust catcher.
  • the second dedusting device is a member of the group containing
  • the further dedusting device is a member of the group containing
  • Figure 1 shows a schematic view of a device according to an embodiment of the invention.
  • Figure 2 shows the development of temperature and pressure of blast furnace gas when peaks of temperature of the blast furnace gas occur.
  • Blast furnace 1 is filled with burden 2.
  • Blast-furnace gas depicted by arrows, is diverted from the blast furnace 1 by several lines of off-take 3.
  • Means for injection of water 4 are provided in the area of the blast furnace's furnace throat 5, in this case a twin fluid nozzle which produces droplets with a d90 of 200 ⁇ .
  • Means for measuring the pressure 6 of the blast-furnace gas are provided at four different positions in the several lines of off-take 3 and in the blast furnace throat 5.
  • a means for triggering off 7 the means for injection of water 4 based on a signal of the means for measuring the pressure 6 is connected to both the means for injection of water 4 and the means for measuring the pressure 6.
  • the connection may be physical, e.g. by wire, or non- physical, e.g. by wireless signals.
  • a first dedusting device 8 for treating of the blastfurnace gas for coarse dedusting is also shown, in this case a dust catcher.
  • blast furnace gas is diverted to the first dedusting device 8 via pipe 9. Via pipe 10 blast furnace gas is diverted from the first dedusting device 8, e.g. to a second dedusting device.
  • Figure 2 shows typical pressure ana temperature readings Tor Diast furnace gas, a peak of temperature of more than 300°C is preceeded by a peak in pressure of more than 250kPa(g) by about 60 seconds.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Environmental & Geological Engineering (AREA)
  • Waste-Gas Treatment And Other Accessory Devices For Furnaces (AREA)
  • Blast Furnaces (AREA)

Abstract

La présente invention concerne un procédé pour la réduction de la température de pics de température d'un gaz de haut fourneau qui est caractérisé en ce que la pression du gaz de haut fourneau est mesurée continuellement et l'injection d'eau dans le gaz de haut fourneau est déclenchée lorsqu'une valeur seuil pour la pression est dépassée. L'injection d'eau est réalisée dans au moins un élément du groupe composé de trois éléments : un gueulard de haut fourneau, des conduites d'évacuation à travers lesquelles le gaz de haut fourneau est dévié du haut fourneau vers un premier dispositif de dépoussiérage et des tuyaux à travers lesquels le gaz de haut fourneau est dévié du premier dispositif de dépoussiérage vers un second dispositif de dépoussiérage ou du second dispositif de dépoussiérage vers un autre dispositif de dépoussiérage. L'invention concerne également un système de dispositifs permettant de réaliser le procédé comprenant un moyen permettant de déclencher (7) le moyen permettant l'injection d'eau (4) sur la base d'un signal du moyen permettant de mesurer la pression (6).
PCT/EP2012/069051 2011-09-28 2012-09-27 Procédé et système de dispositifs pour la réduction de la température de pics de température d'un gaz de haut fourneau Ceased WO2013045534A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP11183103A EP2574873A1 (fr) 2011-09-28 2011-09-28 Procédé et dispositif pour diminuer la température des pics de température du gaz de haut-fourneau
EP11183103.8 2011-09-28

Publications (1)

Publication Number Publication Date
WO2013045534A1 true WO2013045534A1 (fr) 2013-04-04

Family

ID=46980941

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2012/069051 Ceased WO2013045534A1 (fr) 2011-09-28 2012-09-27 Procédé et système de dispositifs pour la réduction de la température de pics de température d'un gaz de haut fourneau

Country Status (2)

Country Link
EP (1) EP2574873A1 (fr)
WO (1) WO2013045534A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3159640A1 (fr) 2015-10-20 2017-04-26 Danieli Corus BV Procede de nettoyage de gas de four et usine de production de metal

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104928421B (zh) * 2015-06-30 2016-10-05 攀钢集团西昌钢钒有限公司 改变高炉冶炼时炉喉温度极差过大的方法
CN115578612B (zh) * 2022-10-11 2023-08-04 浙江大学 基于标志物目标检测的高炉炉顶布料阶段识别方法及装置

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3549138A (en) * 1968-10-08 1970-12-22 James L Thomas Method of pressure equalizing for blast furnace top
DE2306887A1 (de) * 1973-02-13 1974-08-15 Ignis Huettenbau Ag Schachtofen, insbesondere kupolofen
US4152123A (en) * 1977-12-16 1979-05-01 Gottfried Bischoff Bau Kompl. Gasreinigungs- Und Wasserruckkuhlanlagen Gmbh & Co. Kommanditgesellschaft Gas-cleaning apparatus and method for high-pressure blast furnace
JPS5941407A (ja) * 1982-08-30 1984-03-07 Mitsui Eng & Shipbuild Co Ltd 高炉排ガスの乾式除塵装置
JPS5974207A (ja) * 1982-10-21 1984-04-26 Mitsui Eng & Shipbuild Co Ltd 高炉々頂圧エネルギ−回収装置の安全装置
JPS61152908A (ja) * 1984-12-26 1986-07-11 Kawasaki Steel Corp 圧力気体による電力回収装置
JPS63109109A (ja) * 1986-10-28 1988-05-13 Nippon Steel Corp 高炉ガス清浄設備

Family Cites Families (3)

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Publication number Priority date Publication date Assignee Title
US4000885A (en) * 1974-11-18 1977-01-04 Whiting Corporation Cupola furnace waste gas recuperative system and method for operating same
JPS5258005A (en) * 1975-11-09 1977-05-13 Kiyotoshi Sakai Method for pressure control of shaft furnace
US4082253A (en) * 1976-03-17 1978-04-04 Air Pollution Industries, Inc. Blast furnace pressure equalizing apparatus

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3549138A (en) * 1968-10-08 1970-12-22 James L Thomas Method of pressure equalizing for blast furnace top
DE2306887A1 (de) * 1973-02-13 1974-08-15 Ignis Huettenbau Ag Schachtofen, insbesondere kupolofen
US4152123A (en) * 1977-12-16 1979-05-01 Gottfried Bischoff Bau Kompl. Gasreinigungs- Und Wasserruckkuhlanlagen Gmbh & Co. Kommanditgesellschaft Gas-cleaning apparatus and method for high-pressure blast furnace
JPS5941407A (ja) * 1982-08-30 1984-03-07 Mitsui Eng & Shipbuild Co Ltd 高炉排ガスの乾式除塵装置
JPS5974207A (ja) * 1982-10-21 1984-04-26 Mitsui Eng & Shipbuild Co Ltd 高炉々頂圧エネルギ−回収装置の安全装置
JPS61152908A (ja) * 1984-12-26 1986-07-11 Kawasaki Steel Corp 圧力気体による電力回収装置
JPS63109109A (ja) * 1986-10-28 1988-05-13 Nippon Steel Corp 高炉ガス清浄設備

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3159640A1 (fr) 2015-10-20 2017-04-26 Danieli Corus BV Procede de nettoyage de gas de four et usine de production de metal
WO2017067862A1 (fr) 2015-10-20 2017-04-27 Danieli Corus B.V. Élimination des poussières sèches d'un gaz de combustion
EP3159640B1 (fr) 2015-10-20 2020-04-01 Danieli Corus BV Procede de nettoyage de gas de four et usine de production de metal
US11397051B2 (en) 2015-10-20 2022-07-26 Danieli Corus B.V. Dry dust removal from furnace gas

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