EP1852666A1 - Ofenauskleidungsstruktur mit rückwärtsneigung und reduzierter teilestruktur - Google Patents

Ofenauskleidungsstruktur mit rückwärtsneigung und reduzierter teilestruktur Download PDF

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Publication number
EP1852666A1
EP1852666A1 EP06711706A EP06711706A EP1852666A1 EP 1852666 A1 EP1852666 A1 EP 1852666A1 EP 06711706 A EP06711706 A EP 06711706A EP 06711706 A EP06711706 A EP 06711706A EP 1852666 A1 EP1852666 A1 EP 1852666A1
Authority
EP
European Patent Office
Prior art keywords
furnace
lining
bricks
cone part
reverse slant
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
EP06711706A
Other languages
English (en)
French (fr)
Other versions
EP1852666B1 (de
EP1852666A4 (de
Inventor
Shigeki Uchida
Minoru Suto
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.)
Shinagawa Refractories Co Ltd
Original Assignee
Shinagawa Refractories Co 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 Shinagawa Refractories Co Ltd filed Critical Shinagawa Refractories Co Ltd
Publication of EP1852666A1 publication Critical patent/EP1852666A1/de
Publication of EP1852666A4 publication Critical patent/EP1852666A4/de
Application granted granted Critical
Publication of EP1852666B1 publication Critical patent/EP1852666B1/de
Expired - Fee Related legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • 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
    • F27D1/00—Casings; Linings; Walls; Roofs
    • F27D1/04—Casings; Linings; Walls; Roofs characterised by the form, e.g. shape of the bricks or blocks used
    • 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
    • F27B3/00—Hearth-type furnaces, e.g. of reverberatory type; Tank furnaces
    • F27B3/10—Details, accessories, or equipment peculiar to hearth-type furnaces
    • F27B3/12—Working chambers or casings; Supports therefor
    • F27B3/14—Arrangements of linings
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
    • C21C5/28—Manufacture of steel in the converter
    • C21C5/42—Constructional features of converters
    • C21C5/44—Refractory linings
    • 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 peculiar to furnaces of these types
    • F27B1/12—Shells or casings; Supports therefor
    • F27B1/14—Arrangements of linings
    • 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
    • F27D1/00—Casings; Linings; Walls; Roofs
    • 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
    • F27D1/00—Casings; Linings; Walls; Roofs
    • F27D1/0003—Linings or walls
    • F27D1/0006—Linings or walls formed from bricks or layers with a particular composition or specific characteristics

Definitions

  • the present invention relates to a reverse slant lining structure for a furnace having a cone structure, such as a converter, an AOD furnace, a hot metal pretreatment furnace, and a torpedo car, in particular, a novel improvement made by constructing a reverse slant lining structure for a furnace having a cone part structure by laying lining bricks at the cone part on a reverse slant to thereby protect the bricks from cracking and attain stable operation.
  • a cone structure such as a converter, an AOD furnace, a hot metal pretreatment furnace, and a torpedo car
  • a furnace having a cone part structure such as a converter, adopts a horizontal lining structure in which bricks at the cone part are laid in parallel with lining bricks lined vertically to an iron shell of a straight barrel part, or has a slant lining structure in which lining bricks at the cone part are laid in such a manner that a center axis of each of the bricks in the thickness direction thereof is positioned on an obtuse angle side defined by a direction of an iron shell of the cone part and a direction vertical to the iron shell of the straight barrel part.
  • the lining bricks at the base of the cone part that is, the bricks close to the straight barrel part side, may suffer cracks and fall off.
  • Patent Documents 1 and 2 disclose a slant lining structure and a horizontal lining structure.
  • Patent Document 3 discloses a slant lining structure in which bricks are laid vertically to an iron shell surface at the cone part.
  • Patent Document 4 discloses a horizontal lining structure.
  • Patent Document 5 discloses a horizontal lining structure, which is characterized in that bricks are laid in such a manner that an angle defined by an axial line of a furnace and a lining brick surface is smaller than an angle defined by the axial line and an iron shell at a cone part.
  • Patent Document 6 discloses a structure related to an AOD furnace
  • Patent Document 7 discloses a structure related to a torpedo car.
  • Patent Document 1 Japanese Utility Model Application Laid-open No. Sho 61-159357
  • Patent Document 2 JP 2003-231910
  • Patent Document 3 Japanese Utility Model Application Laid-open No. Hei 03-067050
  • Patent Document 4 JP Hei 05-279719
  • Patent Document 5 JP Hei 07-003321
  • Patent Document 6 JP Hei 07-224316
  • Patent Document 7 JP Hei 08-176634 A
  • the conventional furnace having a cone part, such as a converter has been constructed as described above, and therefore has involved the following problems. That is, the slant lining structure produces an effect of reducing stress as compared with the horizontal lining structure, however, the bricks may fall off during construction of the furnace, or the bricks may come out when the furnace is in use. Also, even if the furnace has been constructed as intended, during most of the time of operation of the furnace, the bricks laid on a slant are always under downward pressure due to the gravity force, and may fall off particularly in the end stage of operation when the bricks are reduced in thickness due to wear.
  • the inventors of the present invention has discovered based on studies that the slant lining structure may reduce stress which leads to cracks in the bricks, but the bricks at the cone part easily generate a gap therebetween as compared with the horizontal lining.
  • a reverse slant lining structure for a furnace having a cone part structure includes a cone part structure of a furnace having a straight barrel part and a cone part, the cone part structure being characterized by including a structure obtained by laying lining bricks in such a manner that a center axis in the thickness direction of each of the lining bricks to be lined inside of the cone part is positioned on an acute angle side defined by an upside axis and perpendicular axis, said upside axis provided on an iron shell surface of the cone part and extending heightwise from the straight barrel part to the cone part along the iron shell, and said perpendicular axis provided perpendicular to the iron shell surface of the straight barrel part.
  • the center axis in the thickness direction forms a reverse slant angle from 5 to 30 degrees with the perpendicular axis.
  • the lining bricks laid at the cone part produce a smooth internal face of the furnace.
  • the furnace includes any one of a converter, an AOD furnace, a torpedo car, and a hot metal pretreatment furnace.
  • the reverse lining structure for a furnace having a cone part structure is constructed as described above, and therefore is capable of producing the following effects. That is, the lining bricks are laid on a reverse slant in a furnace having a cone structure, such as a converter, an AOD furnace, a hot metal pretreatment furnace, or a torpedo car, which prevents the bricks from being misaligned or falling off during construction of the furnace, to thereby making it possible to construct the furnace with ease. Accordingly, there is produced an effect of significantly reducing construction time of the furnace. Also, according to the present invention, it is possible to protect the bricks from cracking by eliminating stress concentration due to expansion of the bricks when the furnace is in use.
  • a furnace 20 is constructed by laying bricks upward from a bottom 20a of the furnace 20.
  • An example thereof is described with reference to Fig. 1.
  • a permanent lining 2 and a wear resistant lining 3 are constructed inside of an iron shell 1.
  • the permanent lining 2 may be formed of a refractory of finite form, such as a brick, or formed of a refractory of infinite form suchascastable, a stampmaterial, or a filling material.
  • the wear resistant lining 3 is formed of bricks of predetermined shape.
  • the permanent lining 2 and the wear resistant lining 3 are constructed from a furnace bottom 4 of the furnace 20 which is in an upright position as shown in Fig. 1, so as to construct the furnace bottom 4, a lower corner part 5, and a straight barrel part 6 in the stated order from bottom to top.
  • a cone part 7 is started to be constructed.
  • the wear resistant lining 3 of the cone part 7 is constructed by laying bricks 7a according to the reverse slant lining structure of the present invention. Then, on top of the cone part 7, a furnace throat 8 is provided.
  • the wear resistant lining 3 at the straight barrel part 6 is constructed of bricks which are laid horizontally, which makes it impossible to construct the cone part 7 immediately above the straight barrel part 6 by laying bricks on a reverse slant. For this reason, a lower raising brick 9 is used to construct the bottom part of the cone part 7.
  • the lower raising brick 9 works as a bridge between the horizontal lining and the reverse slant lining, and as shown in Fig. 2, one or more lower raising bricks 9 are used to gradually change an angle of the horizontal lining to an angle of the reverse slant lining.
  • the bricks are laid to provide the reverse slant lining toward the top of the cone part 7.
  • Fig. 1 shows an example in which only one upper raising brick 10 is used as the last one of the bricks, however, a plurality of raising bricks 10 may also be used.
  • the lining bricks 7a constituting the wear resistant lining 3 which are laid on a reverse slant at the cone part 7 may be laid so as to produce a smooth internal face 7aA (operation surface) of the furnace and a back face 7aB as shown in Fig. 2, or may be laid in a staircase pattern as shown in Figs. 3 to 5.
  • the corners of the stepped bricks are susceptible to cracking when the furnace is in use, and therefore, the construction of Fig. 2 is more preferable, in which the lining bricks 7a at the cone part 7 are laid without producing steps in the internal face 7aA of the furnace.
  • a reverse slant angle of the reverse slant lining which is constituted by the lining bricks 7a and provided to the cone part 7 is determined as follows.
  • a center axis 14 in the thickness direction of each of the lining bricks 7a provided to the cone part 7 is positioned on an acute angle side 13 defined by a perpendicular axis 11 perpendicularly extending with respect to the iron shell 1 of the straight barrel part 6 toward the internal face 7aA of the furnace and an upside axis 12 extending heightwise along the iron shell 1 of the cone part 7, the bricks are laid on a reverse slant.
  • a reverse slant angle 16 which is defined by the center axis 14 and the perpendicular axis 11 of the brick 7a in the thickness direction thereof in Fig. 9 may be set to an arbitrary angle to produce an intended effect as long as the bricks are laid on a reverse slant. However, it is desirable to provide the reverse slant angle 16 from 5 to 30 degrees.
  • the reverse slant angle 16 is less than 5 degrees, it reduces an effect of protecting the lining bricks 7a from cracking and closely spacing the lining bricks 7a without generating a gap therebetween, in contrast to the object of the present invention, and the lining bricks 7a may tend to fall off easily. If the reverse slant angle 16 is more than 30 degrees, it may be possible, for example, to provide a dowel (not shown) to one or both of the upper and lower faces of the lining bricks 7a in order to prevent the lining bricks 7a from falling off when the furnace is in operation.
  • the construction method of the present invention may be adopted to construct a converter, an AOD furnace, a torpedo car, a hot metal pretreatment furnace, or the like, which has a cone part, to thereby produce an effect.
  • Table 1 includes a first table which shows results of experiments performed by using a plurality of types of furnaces to which the reverse slant lining structure for a furnace having a contracting part structure according to the present invention is applied.
  • the cone part construction time ratio is obtained by dividing the time needed to make preparations and built the furnace according to the technology of the present invention by the time needed to make preparations and built the same furnace by laying bricks on a slant as a comparative example.
  • the ratio of 100 indicating that the present invention is equal to the comparative example, the smaller numeric value of the ratio indicates the shorter construction time which is preferable.
  • the degree of breakdown of the bricks due to cracking at the construction part is obtained by dividing the rate of breakdown (mm/ch) of the bricks resulting from cracking when the furnace is constructed according to the technology of the present invention by the rate of breakdown of the bricks resulting from cracking when the same furnace is constructed by laying bricks on a slant as a comparative example.
  • the degree of 100 indicating that the present invention is equal to the comparative example
  • the smaller numeric value of the ratio indicates the smaller rate of breakdown which is preferable.
  • the degree of falling off of the bricks at the cone part is obtained by dividing the number of bricks that have fallen off from the cone part of the furnace, during one generation thereof, which is constructed according to the technology of the present invention by the number of bricks that have fallen off from the cone part of the same furnace, during one generation thereof, which is constructed by laying bricks on a slant as a comparative example.
  • the degree of 100 indicating that the present invention is equal to the comparative example
  • the smaller numeric value of the ratio indicates the smaller rate of breakdown, which is preferable. Accordingly, as understood from the first table, any of the embodiments of the present invention is superior to the corresponding comparative examples.
  • Fig. 10 is a cross-sectional view showing a construction obtained by applying the present invention to the lining of a torpedo car 30.
  • the members similar to those of Fig. 1 are denoted by the same reference numerals, and the description thereof is omitted.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Furnace Housings, Linings, Walls, And Ceilings (AREA)
  • Carbon Steel Or Casting Steel Manufacturing (AREA)
  • Treatment Of Steel In Its Molten State (AREA)
  • Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)
EP06711706.9A 2005-01-20 2006-01-16 Ofenauskleidungsstruktur mit rückwärtsneigung und reduzierter teilestruktur Expired - Fee Related EP1852666B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2005013110A JP4469731B2 (ja) 2005-01-20 2005-01-20 絞り部構造を有する炉
PCT/JP2006/300425 WO2006077786A1 (ja) 2005-01-20 2006-01-16 絞り部構造を有する炉の逆傾斜ライニング構造

Publications (3)

Publication Number Publication Date
EP1852666A1 true EP1852666A1 (de) 2007-11-07
EP1852666A4 EP1852666A4 (de) 2008-09-10
EP1852666B1 EP1852666B1 (de) 2015-12-23

Family

ID=36692176

Family Applications (1)

Application Number Title Priority Date Filing Date
EP06711706.9A Expired - Fee Related EP1852666B1 (de) 2005-01-20 2006-01-16 Ofenauskleidungsstruktur mit rückwärtsneigung und reduzierter teilestruktur

Country Status (6)

Country Link
EP (1) EP1852666B1 (de)
JP (1) JP4469731B2 (de)
KR (1) KR101223869B1 (de)
AU (1) AU2006207148B2 (de)
TW (1) TW200641316A (de)
WO (1) WO2006077786A1 (de)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2008128548A (ja) * 2006-11-20 2008-06-05 Tsukishima Kankyo Engineering Ltd 焼却炉の炉壁積みつけ方法および焼却炉
JP2011162801A (ja) * 2008-05-20 2011-08-25 Shinagawa Refractories Co Ltd 逆傾斜フルライニング構造
CN101664663B (zh) * 2008-09-02 2012-06-20 天津市恒达金属制品有限公司 一种耐腐蚀碱锅及其制造工艺

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0682164A (ja) * 1992-09-07 1994-03-22 Toshiba Ceramics Co Ltd 円筒状工業炉
JP2000035287A (ja) 1998-07-16 2000-02-02 Ngk Insulators Ltd 耐火レンガ及び耐火レンガの施工方法
JP2001279319A (ja) 2000-03-30 2001-10-10 Kawasaki Steel Corp ボトム交換型転炉

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
No further relevant documents disclosed *
See also references of WO2006077786A1 *

Also Published As

Publication number Publication date
EP1852666B1 (de) 2015-12-23
EP1852666A4 (de) 2008-09-10
JP4469731B2 (ja) 2010-05-26
AU2006207148B2 (en) 2011-05-12
KR101223869B1 (ko) 2013-01-17
AU2006207148A1 (en) 2006-07-27
JP2006200824A (ja) 2006-08-03
WO2006077786A1 (ja) 2006-07-27
KR20070099650A (ko) 2007-10-09
TWI351506B (de) 2011-11-01
TW200641316A (en) 2006-12-01

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