WO2004079020A1 - 転炉底吹き羽口の切替方法および交換方法 - Google Patents
転炉底吹き羽口の切替方法および交換方法 Download PDFInfo
- Publication number
- WO2004079020A1 WO2004079020A1 PCT/JP2004/002482 JP2004002482W WO2004079020A1 WO 2004079020 A1 WO2004079020 A1 WO 2004079020A1 JP 2004002482 W JP2004002482 W JP 2004002482W WO 2004079020 A1 WO2004079020 A1 WO 2004079020A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- tuyere
- brick
- converter
- drilling
- blowing
- Prior art date
Links
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
- F27D3/00—Charging; Discharging; Manipulation of charge
- F27D3/16—Introducing a fluid jet or current into the charge
-
- 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
- C21C5/46—Details or accessories
- C21C5/48—Bottoms or tuyéres of converters
-
- 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
- F27D3/00—Charging; Discharging; Manipulation of charge
- F27D3/16—Introducing a fluid jet or current into the charge
- F27D2003/161—Introducing a fluid jet or current into the charge through a porous element
-
- 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
- F27D3/00—Charging; Discharging; Manipulation of charge
- F27D3/15—Tapping equipment; Equipment for removing or retaining slag
- F27D3/1509—Tapping equipment
- F27D3/1527—Taphole forming equipment, e.g. boring machines, piercing tools
Definitions
- the present invention relates to a method of switching a bottom blowing tuyere for switching a bottom blowing tuyere for stirring and refining a steel bath by injecting gas into a steel bath from the bottom of a converter, and a method for replacing a bottom blowing tuyere.
- the present invention relates to a method of replacing a tuyere of a furnace bottom.
- drilling bricks to be used as tuyere receiving bricks are installed in advance at locations other than the bottom blown tuyere, and the tuyere during use is subject to wear.
- the previously installed brick for perforation is perforated from the outside of the converter shell, and a new tuyere is inserted into a grinding hole formed through the perforated hole.
- Technology to continue operation is disclosed I have.
- the tuyere that can no longer be used is closed with an appropriate refractory material such as a cast refractory material, a sprayed refractory material or a sprayed refractory material.
- the tuyere receiving brick is a brick installed around the tuyere to support and protect the tuyere.
- Japanese Patent Application Laid-Open No. 59-41414 discloses that a worn tuyere is withdrawn, a refractory is filled in the removed gap by a flame spraying method, and the tuyere is inserted into the filling portion again.
- a technique has been disclosed in which a hole is pierced, a new tuyere is inserted into the formed pierced portion, and the tuyere is replaced.
- a pre-installed brick for perforation and a tuyere receiving brick are drilled from the outside of a converter.
- the drilling direction of the brick to be drilled usually the longitudinal axis direction
- the drilling direction of the drilling machine in order to drill from the outside of the converter. Therefore, the drilling hole by the drilling machine does not stay in the brick to be drilled, but also drills to the surrounding brick to damage the surrounding brick. Also, the grinding hole becomes larger than necessary. Such troubles occur.
- the replacement tuyere will be worn out, and the service period of the bottom blown tuyere will be significantly shortened compared to the expected period.
- it takes time to determine the drilling direction and there is a problem that the drilling time becomes longer than necessary.
- An object of the present invention is to provide a new bottom blow blade in a cutting hole formed by drilling a perforating brick previously installed in a portion other than the bottom blow tuyere at the bottom of the converter from the outside of the converter with a punch.
- the bottom blow tuyere is switched by inserting a b, it is possible to form a grinding hole by piercing a central portion of the piercing brick along a predetermined piercing direction in a short time.
- a method for switching the tuyere of the converter bottom To provide.
- Another object of the present invention is to replace the bottom tuyere of the converter bottom with a method of piercing the center of a tuyere receiving brick of a conventional tuyere along a predetermined piercing direction in a short time. It is an object of the present invention to provide a method for replacing a tuyere of a converter bottom blow, which enables a grinding hole to be formed by the method.
- a new bottom-blowing tuyere is formed in a perforated brick previously installed in a portion other than the portion where the bottom-blowing tuyere is installed in the refractory layer covering the bottom of the converter.
- This is a method of switching the bottom tuyere of the converter by switching the bottom tuyere.Either the steel surface that covers the outside of the converter or the flange surface attached to this steel shell is used as the reference surface.
- the tuyere comprising the refractory and the gas injection pipe provided in the refractory layer covering the bottom of the converter is eroded and the remaining thickness thereof becomes a predetermined value.
- a method of replacing the tuyere bottom blow tuyere that replaces the tuyere when it reaches, using either the steel surface covering the outside of the converter or the flange surface attached to this steel shell as the reference surface.
- the step of installing the tuyere receiving brick so that the reference surface and the tuyere receiving brick on which the tuyere is installed are perpendicular to each other, and the tuyere where the previous tuyere is installed.
- the tuyere receiving brick and the tuyere receiving brick The drilling direction of the perforated brick is perpendicular to this reference surface, using either the iron shell surface of the converter or the flange surface attached to the steel shell as the reference surface. And drill the hole perpendicular to this reference plane.
- the tuyere receiving brick to be perforated is used as a reference surface, using either the steel surface of the converter or the flange surface attached to the steel shell as the reference surface.
- the tuyere receiving brick is installed so that the direction of perforation is perpendicular to it, and perforation is perpendicular to this reference plane. For this reason, in any case, a ground hole should be formed along the target drilling direction almost in the center of the brick for drilling and the tuyere receiving brick without damaging the surrounding bricks during drilling. Becomes possible. As a result, the life of the inserted tuyere is stabilized, and long-term gas injection becomes possible.
- the drilling machine only has to drill a hole perpendicularly to the reference plane, and can perform the drilling in a short time without positioning the brick for drilling and the tuyere receiving brick to be drilled.
- the brick for drilling and the tuyere receiving hole to be drilled are installed in the drilling direction of the drilling machine and the converter iron of the brick for drilling and the tuyere receiving brick so that the grinding hole is installed in the center. It is installed in advance so that the center of the skin-side end surface substantially matches.
- FIG. 1 is a cross-sectional view showing a part of a converter having a bottom blowing tuyere
- FIGS. 2A to 2D are cross-sectional views for explaining steps of a method of switching the bottom blowing tuyere according to the first embodiment of the present invention.
- 3A to 3D are cross-sectional views for explaining steps of a method for replacing a tuyere according to the second embodiment of the present invention.
- Figure 1 shows bottom blowing It is sectional drawing which shows a part of converter with tuyere.
- the converter has a steel shell 9 forming an outer shell, a permanent brick 14 lined inside the steel shell 9 in contact with the steel shell 9, and an inner side of the permanent brick 14 And a work brick 13 as a consumable member.
- the work bricks 13 are covered with one layer, but may be two layers or more.
- a plurality of bottom blow tuyeres 1 are provided through the work bricks 13 and the permanent bricks 14, and a steel bath in the converter is provided through the plurality of bottom blow tuyeres 1.
- the bottom blowing tuyere 1 covers a metal wind box 4 provided at the bottom, a plurality of gas blowing pipes 2 extending upward from the wind box and having an inner diameter of 5 mm or less, and a gas blowing pipe 2. And a gas introduction pipe 5 inserted into the bottom of the wind box 4 for supplying the above-described stirring gas or purification gas.
- the stirring gas or the purifying gas introduced into the wind box 4 through the gas inlet pipe 5 is equalized in the wind box 4 and then is introduced into the steel bath through the plurality of gas injection pipes 2. It is blown evenly.
- the plurality of gas injection pipes 2 and the refractory 3 are integrally formed. It should be noted that the bottom tuyere is not limited to such a structure, and may be appropriately selected according to the purpose. For example, there is no problem even if it is equipped with one gas introduction pipe and a coated refractory that covers it.
- the bottom blow tuyere 1 is fitted into a part of the brick of the work brick 13, and the brick functions as the tuyere receiving brick 13 a.
- a flange 10 continuous with the steel shell 9 is provided outside the tuyere receiving brick 13 a in which the bottom blow tuyere 1 exists.
- the plurality of flanges 10 are arranged at appropriate positions on the steel shell as communication paths with the gas injection device.
- Hula The flange lid 11 is port-fastened to the flange 10.
- a base brick 8 is interposed between the permanent brick 14 and the flange lid 11.
- the brick 13 provided around the bottom blowing tuyere 1 was severely eroded by the steel bath that was strongly stirred by the blown gas, and had a higher erosion rate than the other parts and remained The thickness decreases rapidly. As a result, the tip of the bottom blowing tuyere 1 is also melted down, the remaining thickness of the bottom blowing tuyere 1 reaches a predetermined value, and it is necessary to switch or replace the bottom blowing tuyere.
- FIGS. 2A to 2D are cross-sectional views for explaining steps of a method for switching a bottom blow tuyere according to the first embodiment of the present invention.
- a brick 6 made of an integrally molded refractory is previously arranged when the work brick 13 and the permanent brick 14 are installed in the converter.
- the perforated brick 6 in order to facilitate connection with the gas injection device outside the converter, the perforated brick 6 usually has a flange 10 serving as a communication path with the gas injection device on the steel shell 9. It is placed at the place where it was attached.
- the inner surface 9 a or the outer surface 9 b (iron surface) of the iron shell 9 is set as a reference surface, and the perforating brick 6 whose longitudinal direction is the direction of perforation is used. It is arranged in advance so that its longitudinal direction, that is, the direction of perforation is perpendicular to the reference plane (first step).
- the flange 10 since the flange 10 is disposed so that the flange surface 10a is parallel to the steel surface, the longitudinal direction of the drilling brick 6 is also perpendicular to the flange surface 10a. The same applies when the flange surface 10a is set as the reference surface.
- Iron skin 9 a, 9 b If the flange surface 10a is not parallel to the flange surface 10a, either the steel surface 9a, 9b or the flange surface 10a may be used as the reference surface.
- the work bricks 13 of the converter are arranged in a direction in which the longitudinal direction is perpendicular to the steel shell 9 as shown in these figures, and the work bricks 13 are placed between the work bricks 13.
- the perforated brick 6 is also installed so that its longitudinal direction is perpendicular to the steel shell 9, but the work brick and the perforated brick are not installed perpendicular to the steel shell 9.
- the concrete construction method of the perforated brick 6 is as follows. First, the flange 10 and the flange lid 11 are fixed to each other with a port (not shown), and the upper and lower surfaces thereof are smooth and parallel planes. A certain base brick 8 is set on the flange lid 11. In the figure, two base bricks 8 are installed, but this is determined by the relationship with the installation thickness of the permanent bricks 14, and the tip of the perforating brick 6 is placed inside the receiving brick 15 If so, the number of installations may be any. Further, a hole 11 a having a size large enough to pass through the bottom blowing tuyere 1 is provided in the center of the flange lid 11.
- the perforating bricks 6 are arranged on the base bricks 8 so that their longitudinal axes are perpendicular to the base bricks 8.
- the receiving bricks 15 are arranged so as to surround the perforated bricks 6 at the positions where the perforated bricks 6 are arranged.
- the thickness of the receiving brick 15 is the same as that of the permanent brick 14, and the receiving brick 15 may be a combined brick or an integral brick. Since the perforated brick 6 is surrounded by the receiving brick 15, the perforated brick 6 does not easily come out of the furnace even if the perforated brick 6 is melted and shortened.
- the molten steel and slag in the converter are discharged, and the converter is tilted at an appropriate angle (usually tilted so that the drilling direction is horizontal), and the flange 1 0 or the flange lid 11 is connected to a mounting flange (not shown) of a drilling machine (not shown) having a drill 16 attached to the tip.
- This automatically aligns the drill 16 of the drilling machine with the center of the flange lid 11. Drilling accuracy is improved by connecting a drilling machine to the flange 10 or the flange lid 11; however, if the drilling machine cannot be connected, the drilling machine may be left on the converter work floor.
- a plurality of drills 16 having different outer diameters are prepared, and the drills are sequentially drilled from the smaller diameter drill 16.
- a guide hole having a small diameter may be formed in advance at the drilling location of the base brick 8 and the brick for drilling 6. May be used. The guide hole of the perforated brick 6 is not penetrated, but only halfway.
- the state of the drilled hole is checked, and if the drilled hole has penetrated and the grinding hole 7 has been formed as shown in FIG. Remove from lid 1 1 and as shown in Figure 2D Then, a new bottom blowing tuyere 1a in which the gas injection pipe 2 and the coated refractory 3 covering the outer circumference of the pipe are integrally formed is inserted into the grinding hole 7 (third step).
- the gas inlet pipe 5 of the bottom blowing tuyere 1 is passed through the hole provided at the center, and the convex part is flanged.
- the tuyere holding lid 12 for entering the hole 11a of the lid 11 to hold the bottom blown tuyere 1a and the flange lid 11 are fixed to each other with a port (not shown).
- the gap between the bottom blowing tuyere 1a and the perforating brick 6 is filled with mortar previously applied to the outer surface of the bottom blowing tuyere 1a.
- a repair material be poured into the gap between the bottom-blowing tuyere 1a and the perforating brick 6 from the inside of the converter so that this gap is minimized.
- the bottom tuyere By switching the bottom tuyere in this manner, the work brick 13 around the perforation brick 6 is not damaged or the grinding hole 7 becomes unnecessarily large. It is possible to switch the bottom blow tuyere by drilling a grinding hole 7 in a short time along a predetermined drilling direction at the center of the bottom hole. As a result, not only is the improvement in converter productivity achieved, but also the wear rate of the new bottom blow tuyere becomes equal to the wear rate of the bottom blow tuyere used since the start of the converter. Even when switching, it is possible to operate the bottom blowing tuyere 1a until the end of the furnace life. As a result, the refining reaction of the converter is made more efficient until the end of the furnace body life, and an improvement in iron yield and a reduction in iron alloy unit can be achieved.
- FIGS. 3A to 3D are cross-sectional views for explaining steps of a method of replacing a bottom-blowing tuyere according to the second embodiment of the present invention.
- the above-mentioned stirring gas or purifying gas is blown through the bottom blowing tuyere 1 to stir or purify the steel bath in the converter, whereby the bottom blowing tuyere 1 is melted. If the remaining thickness of the bottom-blowing tuyere 1 reaches the specified value, replace the bottom-blowing tuyere 1.
- the inner surface 9a or the outer surface 9b (steel surface) of the steel shell 9 is set as a reference surface, and the tuyere receiving brick 13a having the longitudinal direction as a perforating direction is previously prepared. It is arranged so that its longitudinal direction, that is, the drilling direction is perpendicular to the reference plane (first step).
- the flange 10 is arranged so that the flange surface 10a is parallel to the steel skin surface, the longitudinal direction of the Is also perpendicular to the flange surface 10a.
- the flange surface 10a may be used as the reference surface as in the first embodiment.
- the molten steel and slag in the converter are discharged, and the converter is tilted and maintained at an appropriate angle (usually tilted so that the drilling direction is horizontal).
- the drill of the drilling machine is automatically aligned with the center of the flange lid 11.
- the center position of the conventional bottom blowing tuyere 1 is changed to the newly formed grinding hole.
- the bottom blow tuyere 1 and the tuyere receiving brick 13a are perforated so as to substantially coincide with the center position.
- the conventional bottom-blowing tuyere 1 is pierced while it is still installed, and the newly formed grinding hole in the tuyere receiving brick 13a has its inner diameter set to the outer diameter of the previous bottom-blowing tuyere 1.
- Slightly larger than This is because the inner surface of the tuyere receiving brick 13a, which was in contact with the conventional bottom blow tuyere 1, may have reduced refractory properties, such as cracks or peeling during conventional or drilling. This causes damage to the state of fitting with the bottom blowing tuyere 1 to be used next time, which may lead to a decrease in the number of times of use, etc., to prevent this from happening. Therefore, the outer diameter of the tuyere used next time is slightly larger than that of the former tuyere.
- the state of the drilled hole is checked, and as shown in FIG. 3C, if the drilled hole penetrates and the grinding hole 7 is formed, the drilling machine is connected to the flange 10 or the flange 10. Remove from the lid 11 and insert a new bottom-blowing tuyere 1b into the grinding hole 7, as shown in Fig.3D, in which a gas injection pipe and a coated refractory covering the outer circumference of this pipe are integrally formed (No. 3 steps).
- the gap between the tuyere tuyere 1b and the tuyere receiving brick 13a is filled with mortar previously applied to the outer surface of the tuyere tuyere 1b.
- a repair material is poured from the inside of the converter into the gap between the bottom blow tuyere 1b and the tuyere receiving brick 13a, so that this gap is made as small as possible.
- the base brick 8 is installed, but the base brick 8 is not installed, and the perforated brick 6 serving as the tuyere receiving brick may be arranged so as to be in contact with the flange lid 11. Work bricks 13 may be placed.
- the brick for perforation and the tuyere can be prevented without damaging the work brick in the peripheral part of the brick for perforation and the tuyere receiving brick, and generating the grinding hole larger than necessary.
- a grinding hole can be pierced in a short time along a predetermined piercing direction, and the tuyere can be switched and exchanged.
- it has high industrial utility, such as improved converter productivity and improved iron yield.
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
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- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Carbon Steel Or Casting Steel Manufacturing (AREA)
Abstract
Description
Claims
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
BR0403944-0A BRPI0403944A (pt) | 2003-03-03 | 2004-03-01 | Método de alternância de tubeira de fundo de conversor e método de substituição |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2003056067 | 2003-03-03 | ||
JP2003-056067 | 2003-03-03 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2004079020A1 true WO2004079020A1 (ja) | 2004-09-16 |
Family
ID=32958682
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2004/002482 WO2004079020A1 (ja) | 2003-03-03 | 2004-03-01 | 転炉底吹き羽口の切替方法および交換方法 |
Country Status (3)
Country | Link |
---|---|
CN (1) | CN1697886A (ja) |
BR (1) | BRPI0403944A (ja) |
WO (1) | WO2004079020A1 (ja) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN102399931A (zh) * | 2010-09-16 | 2012-04-04 | 鞍钢股份有限公司 | 一种顶底复吹转炉底吹元件热更换方法 |
US11155890B2 (en) * | 2019-07-17 | 2021-10-26 | Air Products And Chemicals, Inc. | Tuyere for a basic oxygen furnace |
CN111518982A (zh) * | 2020-04-21 | 2020-08-11 | 攀钢集团攀枝花钢铁研究院有限公司 | 一种提高炼钢炉全炉役底吹搅拌效果的方法 |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5885A (ja) * | 1981-06-23 | 1983-01-05 | 新日本製鐵株式会社 | 溶融金属収納容器のスリ−ブ煉瓦除去工法 |
JPH0372014A (ja) * | 1989-08-09 | 1991-03-27 | Nkk Corp | 転炉底吹きノズルの切替え方法 |
JPH0464555U (ja) * | 1990-10-08 | 1992-06-03 |
-
2004
- 2004-03-01 WO PCT/JP2004/002482 patent/WO2004079020A1/ja active Application Filing
- 2004-03-01 CN CN 200480000173 patent/CN1697886A/zh active Pending
- 2004-03-01 BR BR0403944-0A patent/BRPI0403944A/pt not_active IP Right Cessation
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5885A (ja) * | 1981-06-23 | 1983-01-05 | 新日本製鐵株式会社 | 溶融金属収納容器のスリ−ブ煉瓦除去工法 |
JPH0372014A (ja) * | 1989-08-09 | 1991-03-27 | Nkk Corp | 転炉底吹きノズルの切替え方法 |
JPH0464555U (ja) * | 1990-10-08 | 1992-06-03 |
Also Published As
Publication number | Publication date |
---|---|
BRPI0403944A (pt) | 2005-03-01 |
CN1697886A (zh) | 2005-11-16 |
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