EP2431485A1 - Verfahren und Vorrichtung zum Entfernen von Steinablagerungen aus einer Stahlbrammenwärmebehandlungsanlage - Google Patents

Verfahren und Vorrichtung zum Entfernen von Steinablagerungen aus einer Stahlbrammenwärmebehandlungsanlage Download PDF

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Publication number
EP2431485A1
EP2431485A1 EP11170934A EP11170934A EP2431485A1 EP 2431485 A1 EP2431485 A1 EP 2431485A1 EP 11170934 A EP11170934 A EP 11170934A EP 11170934 A EP11170934 A EP 11170934A EP 2431485 A1 EP2431485 A1 EP 2431485A1
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EP
European Patent Office
Prior art keywords
scale
heat treatment
deposit
steel slab
quenching medium
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.)
Withdrawn
Application number
EP11170934A
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English (en)
French (fr)
Inventor
Mick Bugdol
John Edward James Wadsworth
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.)
Tata Steel UK Ltd
Original Assignee
Tata Steel UK 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
Application filed by Tata Steel UK Ltd filed Critical Tata Steel UK Ltd
Priority to EP11170934A priority Critical patent/EP2431485A1/de
Publication of EP2431485A1 publication Critical patent/EP2431485A1/de
Withdrawn legal-status Critical Current

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    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/82—Descaling by thermal stresses
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B08—CLEANING
    • B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
    • B08B3/00—Cleaning by methods involving the use or presence of liquid or steam
    • B08B3/02—Cleaning by the force of jets or sprays
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B08—CLEANING
    • B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
    • B08B5/00—Cleaning by methods involving the use of air flow or gas flow
    • B08B5/02—Cleaning by the force of jets, e.g. blowing-out cavities
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B08—CLEANING
    • B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
    • B08B7/00—Cleaning by methods not provided for in a single other subclass or a single group in this subclass
    • B08B7/0064—Cleaning by methods not provided for in a single other subclass or a single group in this subclass by temperature changes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B08—CLEANING
    • B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
    • B08B7/00—Cleaning by methods not provided for in a single other subclass or a single group in this subclass
    • B08B7/0064—Cleaning by methods not provided for in a single other subclass or a single group in this subclass by temperature changes
    • B08B7/0092—Cleaning by methods not provided for in a single other subclass or a single group in this subclass by temperature changes by cooling
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • C21D9/0006—Details, accessories not peculiar to any of the following furnaces
    • C21D9/0018—Details, accessories not peculiar to any of the following furnaces for charging, discharging or manipulation of charge
    • 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
    • F27D25/00—Devices or methods for removing incrustations, e.g. slag, metal deposits, dust; Devices or methods for preventing the adherence of slag
    • F27D25/008—Devices or methods for removing incrustations, e.g. slag, metal deposits, dust; Devices or methods for preventing the adherence of slag using fluids or gases, e.g. blowers, suction units

Definitions

  • the present invention relates to a method of removing scale deposits from a steel slab heat treatment construction, as well as a suitable removal device.
  • JP A 53089813 has disclosed a scraper for removal of scale from the upper surface of the walking beams and from the surface of the stationary hearth.
  • the scraper is operated from outside the furnace.
  • pneumatic tools to "chip" the scale off, but it is also known that these pneumatic tools have shown only limited success, in particular in walking beam surfaces.
  • JP A 62136518 , JP A 3079714 , JP A 4280913 and JP 5171256 disclose the use of gas as a physical/mechanical means to blow off scale that is present on the beams of a walking furnace.
  • Another known method comprises walking back a cold slab through the furnace in order to mechanically break the connections between the scale deposits and beams.
  • a method of removing scale deposits from a steel slab heat treatment construction comprises at least a quenching step of quenching scale deposits with a fluid quenching medium.
  • a fluid quenching medium such as a gas or liquid, is applied to the scale deposit to be removed.
  • This relatively fast and local cooling generates high thermal stresses due to the temperature differences created, in particular at the interface between deposit and the structure that support the deposit. These thermal stresses generated cause disruption of the mechanical bonding of the deposit to the supporting structure.
  • the deposit thus loosened can be easily removed with minimum force to leave a clean construction.
  • heat transfer from the scale deposit to the quenching medium is higher than heat transfer from the hot heat treatment construction to the scale deposit.
  • the quenching step comprises jetting the fluid quenching medium to a scale deposit.
  • a focussed jet of quenching medium is forced to the scale deposit while directed contact between the quenching medium and the adjacent steel slab heat treatment construction is limited as far as possible, thereby maintaining the temperature differences and thus thermal stresses between deposit and supporting structure, in particular at the interface.
  • the jet force as such, in particular when the jet is pulsed, aids to remove the scale deposit once the mechanical bonding is disrupted.
  • a mechanical scale treatment step of mechanically treating scale is performed, such as pneumatic chipping.
  • Suitable examples of the fluid quenching medium comprise nitrogen, compressed air and argon. Water could also be used since it has increased cooling capacity.
  • the method also comprises a step of determining the position of the scale deposit. If the position of the deposit is actually known, then the quenching step can be performed more effectively, in particular the quenching medium can be directed to quench only the scale nodule and not the supporting construction.
  • the appearance of a scale deposit is visually observed, and upon the scale deposit becoming dark in appearance, the mechanical scale treatment is started.
  • the dark appearance of the scale deposit contrary to the appearance of the supporting structure is a visually perceivable indication, that the scale deposit has been quenched sufficiently in view of easy removal.
  • the pressure and/or flow rate of the quenching medium are controlled in order to allow adjustment of the jetted quenching medium to the nodule treated.
  • the invention relates to a device for removing scale deposits from a steel slab heat treatment construction, in particular the beams of a walking beam furnace, comprising at a least a delivery means for delivering a fluid quenching medium to the scale deposits.
  • the device according to the invention offers the same effects and advantages as explained above with respect to the method according to the invention.
  • the delivery means comprises a lance having a feed end for receiving the fluid quenching medium and a nozzle end for jetting the fluid quenching medium to the interface of a scale deposit and the adjacent steel slab heat treatment construction.
  • the lance has a length that is sufficient to reach all affected areas in the high temperature zones of the walking beam surface.
  • the lance has a length of up to 10 m.
  • the deposit size is in the range of 30 mm to 100 mm.
  • the dimensions of the nozzle at the nozzle end are smaller than this deposit size.
  • the nozzle end comprises a nozzle having a diameter in the range of 2-15 mm allowing an accurate focussing of the quenching medium at the preferred positions.
  • Pressure controllers and/or flow controllers can be incorporated in the device according to the invention offering adjustment of the quenching medium to the scale deposit that is treated.
  • the device according to the invention also comprises a vision means for determining the position of a scale deposit in the vicinity of delivery end of the delivery means, such as the nozzle end.
  • Suitable vision means comprises a mini camera, preferably shielded against the heat e.g. a water cooled mini camera, in combination with a image display means outside the heat treatment construction.
  • the lance may be externally cooled, internally cooled such as self cooled by the quenching medium, for example flowing in concentric tubes or shielded by a heat resistant material.
  • the components itself can also be manufactured from heat resistant material.
  • the device also comprises a tool for mechanical treatment of a scale deposit, such as at the nozzle end of the lance.
  • the device advantageously further comprises a movable support carrying the delivery means.
  • the image display means may be provided on this movable support.
  • the device advantageously comprises manoeuvring means for guiding and supporting the free end of the delivery means, such as the nozzle end of the lance.
  • the manoeuvring means is designed such that it is able to "sit" on a beam of a walking beam furnace, e.g. rollers or a sliding system shaped around one or more of the beams in a walking beam furnace.
  • FIG. 1 and 2 an embodiment of a device according to the invention is diagrammatically shown, wherein reference numeral 1 indicates a steel slab heat treatment construction, in particular a walking beam furnace, including stationary and walking beams 10 (only two shown). These beams are arranged in a furnace housing 12.
  • the device according to the invention is indicated in its entirety by reference numeral 20. It comprises a movable carrier 22 having (driven) wheels 24 and a rotary supporting disc 26, arranged near the exit 14 of the housing 12.
  • the carrier 22 supports the feed end 28 of a delivery means 30, here exemplified by a lance.
  • the opposite nozzle end 32 is vertically movable and is supported by the movable carrier 22, e.g. using piston-cylinder assemblies 34.
  • FIG. 1 shows an embodiment of a manoeuvring guide 36 comprising a body 38 connected to the lance 30 at pivot 40.
  • the body 38 carries upper and lower rollers 42 sitting on beam 10.
  • the nozzle end 32 is provided with a vision means 44, e.g. a water cooled camera.
  • the display means 46 thereof are arranged at the movable carrier 22.
  • a mechanical tool 48 for assisting removal, such as a chipper, is also provided at the nozzle end 32.
  • the nozzle end 32 is manoeuvred into position in the direct vicinity of scale nodule 50 on beam 10 using the vision means 44 and suitable movement of carrier 22 and lance 30. Then quenching medium 52 is jetted to the nodule 50, in particular the interface of nodule 50 and beam 10. If necessary, the pressure and/or flow rate of quenching medium are adjusted to the nodule size. If the nodule 50 becomes dark as can be viewed on the display 46, the nodule 50 will spall off or can be easily chipped off by chipping tool 48.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • General Engineering & Computer Science (AREA)
  • Heat Treatments In General, Especially Conveying And Cooling (AREA)
EP11170934A 2011-06-22 2011-06-22 Verfahren und Vorrichtung zum Entfernen von Steinablagerungen aus einer Stahlbrammenwärmebehandlungsanlage Withdrawn EP2431485A1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP11170934A EP2431485A1 (de) 2011-06-22 2011-06-22 Verfahren und Vorrichtung zum Entfernen von Steinablagerungen aus einer Stahlbrammenwärmebehandlungsanlage

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP11170934A EP2431485A1 (de) 2011-06-22 2011-06-22 Verfahren und Vorrichtung zum Entfernen von Steinablagerungen aus einer Stahlbrammenwärmebehandlungsanlage

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102654359A (zh) * 2012-05-03 2012-09-05 辽宁科技大学 清除回转窑出口结渣用的高压热风切割装置
CN103512380A (zh) * 2013-07-10 2014-01-15 曲阜中联水泥有限公司 一种水泥生产设备结皮水汽清除方法及其所使用的设备
CN113814231A (zh) * 2020-06-18 2021-12-21 大族激光科技产业集团股份有限公司 一种激光清洗淬火装置及其工作方法
CN114112899A (zh) * 2021-10-31 2022-03-01 张家港宏昌钢板有限公司 小规格线材在线氧化铁皮剥离性测试装置
CN117448547A (zh) * 2023-10-07 2024-01-26 首钢京唐钢铁联合有限责任公司 一种炉底辊结瘤的处理方法

Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5389813A (en) 1977-01-18 1978-08-08 Ishikawajima Harima Heavy Ind Co Ltd Method and apparatus for removing scale in walking beam furnace
JPS62136518A (ja) 1985-12-10 1987-06-19 Sumitomo Metal Ind Ltd ウォーキングビーム式加熱炉のスキッド上スケールの除去方法とその装置
DD287847A7 (de) * 1989-01-09 1991-03-14 Spezialbaukombinat Magdeburg,De Vorrichtung zum reinigen metallischer transportrollen von brennoefen fuer keramische erzeugnisse
JPH0379714A (ja) 1989-08-23 1991-04-04 Sumitomo Metal Ind Ltd スキッド部のスケール除去装置
JPH04280913A (ja) 1991-03-11 1992-10-06 Nippon Steel Corp ウォーキングビーム式加熱炉のビーム上のスケール除去方法
JPH05171256A (ja) 1991-12-26 1993-07-09 Nippon Steel Corp ウォーキングビーム加熱炉のスケール除去装置
US6238208B1 (en) * 1997-06-30 2001-05-29 Kawasaki Steel Corporation Method and apparatus for cooling furnace
EP1167546A1 (de) * 2000-06-29 2002-01-02 Kabushiki Kaisha Kobe Seiko Sho Bedienungsverfahren für Drehherdofen
JP2005097731A (ja) * 2003-08-19 2005-04-14 Nippon Steel Corp ウォーキングビーム式加熱炉のスケール除去装置
JP2005315509A (ja) * 2004-04-28 2005-11-10 Sumitomo Metal Ind Ltd ウォーキングビーム式炉におけるビーム表面のスケール除去方法及び装置
JP2007146194A (ja) * 2005-11-24 2007-06-14 Nippon Steel Corp スケール除去装置

Patent Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5389813A (en) 1977-01-18 1978-08-08 Ishikawajima Harima Heavy Ind Co Ltd Method and apparatus for removing scale in walking beam furnace
JPS62136518A (ja) 1985-12-10 1987-06-19 Sumitomo Metal Ind Ltd ウォーキングビーム式加熱炉のスキッド上スケールの除去方法とその装置
DD287847A7 (de) * 1989-01-09 1991-03-14 Spezialbaukombinat Magdeburg,De Vorrichtung zum reinigen metallischer transportrollen von brennoefen fuer keramische erzeugnisse
JPH0379714A (ja) 1989-08-23 1991-04-04 Sumitomo Metal Ind Ltd スキッド部のスケール除去装置
JPH04280913A (ja) 1991-03-11 1992-10-06 Nippon Steel Corp ウォーキングビーム式加熱炉のビーム上のスケール除去方法
JPH05171256A (ja) 1991-12-26 1993-07-09 Nippon Steel Corp ウォーキングビーム加熱炉のスケール除去装置
US6238208B1 (en) * 1997-06-30 2001-05-29 Kawasaki Steel Corporation Method and apparatus for cooling furnace
EP1167546A1 (de) * 2000-06-29 2002-01-02 Kabushiki Kaisha Kobe Seiko Sho Bedienungsverfahren für Drehherdofen
JP2005097731A (ja) * 2003-08-19 2005-04-14 Nippon Steel Corp ウォーキングビーム式加熱炉のスケール除去装置
JP2005315509A (ja) * 2004-04-28 2005-11-10 Sumitomo Metal Ind Ltd ウォーキングビーム式炉におけるビーム表面のスケール除去方法及び装置
JP2007146194A (ja) * 2005-11-24 2007-06-14 Nippon Steel Corp スケール除去装置

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102654359A (zh) * 2012-05-03 2012-09-05 辽宁科技大学 清除回转窑出口结渣用的高压热风切割装置
CN102654359B (zh) * 2012-05-03 2013-11-13 辽宁科技大学 清除回转窑出口结渣用的高压热风切割装置
CN103512380A (zh) * 2013-07-10 2014-01-15 曲阜中联水泥有限公司 一种水泥生产设备结皮水汽清除方法及其所使用的设备
CN113814231A (zh) * 2020-06-18 2021-12-21 大族激光科技产业集团股份有限公司 一种激光清洗淬火装置及其工作方法
CN114112899A (zh) * 2021-10-31 2022-03-01 张家港宏昌钢板有限公司 小规格线材在线氧化铁皮剥离性测试装置
CN117448547A (zh) * 2023-10-07 2024-01-26 首钢京唐钢铁联合有限责任公司 一种炉底辊结瘤的处理方法

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