JPH09279212A - Main iron trough of blast furnace - Google Patents
Main iron trough of blast furnaceInfo
- Publication number
- JPH09279212A JPH09279212A JP8112196A JP11219696A JPH09279212A JP H09279212 A JPH09279212 A JP H09279212A JP 8112196 A JP8112196 A JP 8112196A JP 11219696 A JP11219696 A JP 11219696A JP H09279212 A JPH09279212 A JP H09279212A
- Authority
- JP
- Japan
- Prior art keywords
- gutter
- blast furnace
- side wall
- main iron
- refractory
- 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- Withdrawn
Links
Landscapes
- Blast Furnaces (AREA)
- Furnace Charging Or Discharging (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、高炉大樋のライニ
ングに関する。TECHNICAL FIELD The present invention relates to a lining of a blast furnace gutter.
【０００２】[0002]
【従来の技術】高炉大樋の耐火物には一般に流し込み成
形用耐火物が使用されるが、溶銑が大樋内で比重差によ
りスラグとメタルに分離するために、大樋耐火物も耐ス
ラグ性に優れた耐火物と、耐溶銑性に優れた耐火物を上
下に張り分けて使用している。しかし、高炉の大型化に
伴う出銑量の増加、出銑温度の高温化、出銑回数の増加
等の影響は、大樋の耐火物にとって益々過酷な使用条件
となり、大樋の損耗を増大させ、それに伴う施工・解体
作業、補修作業の増加は作業者に大きな負荷を与えてい
る。このためコスト面、作業面から大樋の長寿命化が望
まれている。BACKGROUND ART Casting refractories are generally used as refractory materials for blast furnace gutters, but since hot metal is separated into slag and metal in the gutter due to the difference in specific gravity, the gutter refractory material is also excellent in slag resistance. The refractory material and the refractory material with excellent hot metal resistance are used by separating them vertically. However, the effects of increasing the amount of tapping metal due to the larger size of the blast furnace, increasing the tapping temperature, increasing the number of tapping, etc., are becoming increasingly severe operating conditions for the refractory of the gutter, increasing the wear of the gutter, The increase in construction, dismantling work, and repair work that accompanies this has placed a heavy burden on workers. Therefore, it is desired to extend the life of the gutter from the viewpoint of cost and work.
【０００３】このような問題点を改良するものとして、
材料面からは、例えば特公昭５７−３８５５４号公報等
で示されるように、アルミナ質骨材に炭化珪素やカーボ
ン質原料を配し、また組織を緻密・高強度化することで
耐食性を高めている。しかしこのような材料面からの改
良では、溶銑とスラグに対して共にその耐食性を向上さ
せることはできず、その効果が得られるためには、比重
差によって溶銑とスラグの分離していることが必要であ
り、溶銑とスラグの分離が十分でない大樋上流部ではそ
の効果が小さくなる。また構造面では特開昭５８−７８
７５３号公報で、出銑口と大樋の位置を変えることで、
出銑に際して溶銑の吹き出しや、スプラッシュを抑制
し、樋耐火物の損傷を防止することが開示されている。[0003] In order to improve such a problem,
From the material side, as disclosed in, for example, Japanese Patent Publication No. 57-38554, silicon carbide or carbonaceous raw material is placed on an alumina-based aggregate, and the structure is made dense and high-strength to improve corrosion resistance. There is. However, with such improvements from the material aspect, it is not possible to improve both the corrosion resistance of hot metal and slag, and in order to obtain the effect, it is necessary to separate hot metal and slag by the difference in specific gravity. It is necessary, and its effect becomes smaller in the upstream of the gutter where the separation of hot metal and slag is not sufficient. In terms of structure, JP-A-58-78
In the 753 publication, by changing the positions of the taphole and the gutter,
It is disclosed that the blowing of hot metal and the splash at the time of tapping are suppressed to prevent damage to the gutter refractory.
【０００４】[0004]
【発明が解決しようとする課題】図１に示すように大樋
は外枠である鉄皮１の内側に流し込み耐火物２を施工し
使用している。また、一般的に高炉出銑孔は仰角約１０
°程度に配置されていて、溶銑は出銑孔から大樋に落下
しながら入っていく。この溶銑の落下箇所３（湯当たり
部）の存在する大樋上流部（２〜７ｍ付近）は、大樋の
損耗が最も大きくなる部分で、大樋の寿命を律速し、補
修回数の増加による作業負荷の増大を招いている。As shown in FIG. 1, Ohi uses a refractory 2 which is cast inside a steel shell 1 which is an outer frame. Generally, the blast furnace taphole has an elevation angle of about 10
It is placed at about °, and the hot metal falls from the taphole into the gutter and enters. The upstream part (near 2 to 7 m) of the gutter where the hot metal drop point 3 (hot water contact part) exists is the part where the wear of the gutter becomes the largest, and the life of the gutter is rate-determined, and the work load due to the increase in the number of repairs increases. Causing an increase.
【０００５】この大樋上流部の損耗は、落下してくる溶
銑により大樋上流部の溶銑の流れ４が、矢印で示したよ
うに乱れた状態となり樋に対する摩耗の増大を招き、ま
たスラグと溶銑の混ざり合った状態が耐火物に対する溶
損を増大し、大樋上流部での損耗の主な要因と考えられ
その結果損耗部５が発生する。This wear of the upstream gutter causes the molten iron flow 4 in the upstream upstream part of the gutter to become turbulent as indicated by the arrow due to the falling hot metal, which causes increased wear on the gutter, and the slag and the molten iron The mixed state increases the melting loss to the refractory and is considered to be the main factor of the wear in the upstream part of the gutter, and as a result, the wear part 5 is generated.
【０００６】そこで、大樋上流部の主な損耗要因となっ
ている、溶銑流の乱れを初期のうちに整流化させ、溶銑
流の耐火物側壁に対する摩擦力を低減させると共に、溶
銑とスラグを溶銑流の初期のうちに分離させ、耐火物の
溶損を抑制させることを考えるに至った。本発明では、
出銑口、大樋等の設備を変更することなく、耐火物に局
部損耗が発生するのを抑制し、大樋の長寿命化を図ると
共に、補修時における作業負荷を軽減させることを可能
とする高炉の大樋を提供するものである。Therefore, the turbulence of the hot metal flow, which is the main cause of wear in the upstream part of the gutter, is rectified in the early stage to reduce the frictional force of the hot metal flow with respect to the side wall of the refractory, and at the same time, the hot metal and the slag are melted. It came to be considered to suppress the melting loss of the refractory by separating them in the early stage of the flow. In the present invention,
A blast furnace that can suppress the local wear of refractory materials, extend the life of large gutters, and reduce the work load during repairs without changing equipment such as tap holes and large gutters. It is intended to provide a large gutter.
【０００７】[0007]
【課題を解決するための手段】すなわち、本発明は、高
炉大樋の溶銑落下位置直下の両内側側壁に、側壁から突
起部へと移行する突起部先端表面が、側壁面となす角度
が１２°以下、かつ突起部高さ位置での接線が、側壁面
となす角度が１２°以下であり、突起部の大樋長さ方向
に突起部先端から高さ位置までの長さａが、大樋の内側
の幅ｂに対してａ／ｂ≦１．１を満足させるような突起
部を設けることを特徴とする高炉大樋である。That is, according to the present invention, on both inner side walls of the blast furnace large gutter immediately below the position where the hot metal falls, the tip end surface of the protrusion that transitions from the side wall to the protrusion forms an angle of 12 ° with the side wall surface. The angle tangent to the side wall surface at the protrusion height position is 12 ° or less, and the length a from the tip of the protrusion to the height position in the direction of the gutter length of the protrusion is the inside of the gutter. The blast furnace gutter is characterized in that it is provided with protrusions that satisfy a / b ≦ 1.1 with respect to the width b.
【０００８】[0008]
【発明の実施の形態】図２に示すように大樋耐火物の流
し込み施工の際、上流部の側壁部に溶銑の流れ方向に流
れの中心に向け、壁面に対し角度を持つように突起部６
を施工する。これにより溶銑流の方向を中心部に向ける
ような方向で耐火物の施工を行い、様々な方向に向かっ
ていた溶銑流の方向を中心に向け、大樋耐火物側壁の摩
耗による物理的な損耗を抑制させると共に、スラグと溶
銑の分離を早め、大樋耐火物の耐スラグ材、耐メタル材
の張り分けの効果を十分に発揮させることで、大樋耐火
物の化学的な損耗を抑制させる。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS As shown in FIG. 2, when pouring a gutter refractory material, a projection 6 is formed on the side wall of the upstream part so as to face the center of the flow in the flow direction of the hot metal and to form an angle with the wall surface.
To construct. As a result, refractory construction is performed in a direction that directs the hot metal flow toward the center, and the hot metal flow direction that was facing various directions is the center, and physical damage due to wear of the side gutter refractory side wall is caused. In addition to suppressing it, it accelerates the separation of slag and hot metal and fully exerts the effect of separating the slag-resistant material and metal-resistant material of the gutter refractory, thereby suppressing the chemical wear of the gutter refractory.
【０００９】[0009]
【実施例】以下、本発明を実施例に基づいて説明する。
図２に示す形状の突起部を、通常使用しているＡｌ2 Ｏ
3 −ＳｉＣ−Ｃ系の耐火物で施工し、乾燥させて作成し
た。その際に大樋の幅をｂ、突起部の起点から最大幅を
持つ部分までの流れ方向の長さをａとして（ａ／ｂ）＝
１に固定し、また側壁から突起部へと移行する突起部先
端表面が側壁面となす角度θ、突起部高さ位置での接線
が側壁面となす角度θ’について、θ＝θ’として実施
した。まず側壁からの角度θを、５°、１０°、１５°
変えて大樋耐火物の耐用性を（ｋｇ／ｔ−ｐｉｇ）で評
価した。その結果を表１に示す。EXAMPLES The present invention will be described below based on examples.
The projections of the shape shown in FIG. 2, Al 2 O that are normally used
It was constructed by using a 3- SiC-C refractory and dried. At that time, the width of the gutter is b, and the length in the flow direction from the starting point of the protrusion to the portion having the maximum width is a (a / b) =
Fixed at 1, and the angle θ formed by the tip surface of the protrusion that transitions from the side wall to the protrusion and the side wall surface, and the angle θ ′ formed by the tangent line at the height of the protrusion and the side wall surface are θ = θ ′ did. First, the angle θ from the side wall is 5 °, 10 °, 15 °
Instead, the durability of the Ohi refractory was evaluated by (kg / t-pig). Table 1 shows the results.
【００１０】[0010]
【表１】 [Table 1]
【００１１】次に、θ＝５°に固定し、大樋の幅に対す
る突起部の長さ（ａ／ｂ）を０．５、７．５、１、１．
２５に変えて、大樋耐火物の耐用性を評価した。その結
果を表２に示す。Next, with θ = 5 ° fixed, the lengths (a / b) of the protrusions with respect to the width of the gutter are 0.5, 7.5, 1, 1.
Instead of 25, the durability of the Ohi refractory was evaluated. The results are shown in Table 2.
【００１２】[0012]
【表２】 [Table 2]
【００１３】上記の結果、角度θは１０°付近で最も効
果的であり、４°＜θ≦１２°の範囲で大樋耐火物の耐
用性が向上することが確認できた。θ＝５°、１０°の
時に、作業負荷の高い大樋の全面全長補修回数を１回／
キャンペーン減らすことができた。しかし、θ＝１５°
では、突起部とその上流の側壁部の損耗が極端に大きく
なり試験を中止した。長さに関しては、（ａ／ｂ）＝１
が最も効果的であり、０．６≦（ａ／ｂ）≦１．１の範
囲で十分な効果が得られた。しかし（ａ／ｂ）＝１．２
では効果は得られなかった。From the above results, it was confirmed that the angle θ is most effective in the vicinity of 10 °, and the durability of the Ohi refractory is improved in the range of 4 ° <θ ≦ 12 °. When θ = 5 °, 10 °, the total number of full-length repairs of a large gutter with a high work load is 1 /
We were able to reduce the campaign. However, θ = 15 °
Then, the abrasion of the protrusion and the side wall portion upstream thereof became extremely large, and the test was stopped. Regarding the length, (a / b) = 1
Is most effective, and a sufficient effect was obtained within the range of 0.6 ≦ (a / b) ≦ 1.1. However, (a / b) = 1.2
No effect was obtained.
【００１４】[0014]
【発明の効果】高炉の大樋として本発明を適用すること
により、大樋の寿命を律速する大樋上流部側壁の損耗を
抑制して、その長寿命化を達成でき、従って、耐火物の
原単位を低減させることが可能になる。また、大樋上流
部の損耗箇所も、従来は上流部の広い範囲で損耗してお
り、その補修も、吹き付け、流し込みによる広範囲の補
修となっていたが、本発明を用いることで、突起部付近
の限定された箇所となり、補修作業負荷の軽減が可能に
なる。By applying the present invention as a large gutter of a blast furnace, it is possible to suppress the wear of the side wall of the upstream part of the large gutter which determines the life of the large gutter and to extend its life. It becomes possible to reduce. Further, the wear location of the upstream part of the gutter was also worn in a wide range of the upstream section in the past, and the repair was also a wide range of repairs by spraying and pouring. This is a limited area, and the repair work load can be reduced.
【図１】高炉大樋の溶損プロフィルを大樋の上方から見
た概念図Fig. 1 Schematic diagram of the erosion profile of the blast furnace gutter viewed from above the gutter
【図２】本発明による高炉大樋のライニング構造図FIG. 2 is a lining structure diagram of a blast furnace gutter according to the present invention.
【図３】突起部の角度θを変えて施工した際の高炉大樋
耐火物の原単位を示す図FIG. 3 is a diagram showing the basic unit of the blast furnace gutter refractory when the construction is performed by changing the angle θ of the protrusion.
【図４】突起部先端から高さ位置までの長さａを変えて
施工した際の高炉大樋耐火物の原単位を示す図FIG. 4 is a diagram showing a basic unit of blast furnace gutter refractory when the length a from the tip of the protrusion to the height position is changed
１ 鉄皮 ２ 耐火物 ３ 湯当たり部 ４ 溶銑の流れ ５ 損耗部 ６ 突起部 1 Iron skin 2 Refractory 3 Hot water contact part 4 Hot metal flow 5 Wear part 6 Projection part
Claims (1)
を設けた高炉大樋であって、側壁から突起部へと移行す
る突起部先端表面が、側壁面となす角度が１２°以下、
かつ突起部高さ位置での接線が、側壁面となす角度が１
２°以下であり、突起部の大樋長さ方向に突起部先端か
ら高さ位置までの長さａが、大樋の内側の幅ｂに対して
ａ／ｂ≦１．１を満足することを特徴とする高炉大樋。1. A blast furnace gutter in which projections are provided on both inner side walls immediately below a position where the molten pig iron falls, wherein the tip surface of the projection transitioning from the side wall to the projection forms an angle of 12 ° or less with the side wall surface.
Moreover, the tangent line at the height of the protrusion has an angle of 1 with the side wall surface.
It is less than 2 °, and the length a from the tip of the protrusion to the height position in the gutter length direction of the protrusion satisfies a / b ≦ 1.1 with respect to the inner width b of the gutter. Blast furnace Ohi.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8112196A JPH09279212A (en) | 1996-04-10 | 1996-04-10 | Main iron trough of blast furnace |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8112196A JPH09279212A (en) | 1996-04-10 | 1996-04-10 | Main iron trough of blast furnace |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH09279212A true JPH09279212A (en) | 1997-10-28 |
Family
ID=14580675
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP8112196A Withdrawn JPH09279212A (en) | 1996-04-10 | 1996-04-10 | Main iron trough of blast furnace |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH09279212A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2013053322A (en) * | 2011-09-01 | 2013-03-21 | Nisshin Steel Co Ltd | Iron runner for blast furnace |
| CN104388617A (en) * | 2014-12-08 | 2015-03-04 | 中国京冶工程技术有限公司 | Main runner structure of smelting furnace |
-
1996
- 1996-04-10 JP JP8112196A patent/JPH09279212A/en not_active Withdrawn
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2013053322A (en) * | 2011-09-01 | 2013-03-21 | Nisshin Steel Co Ltd | Iron runner for blast furnace |
| CN104388617A (en) * | 2014-12-08 | 2015-03-04 | 中国京冶工程技术有限公司 | Main runner structure of smelting furnace |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A300 | Withdrawal of application because of no request for examination |
Free format text: JAPANESE INTERMEDIATE CODE: A300 Effective date: 20030701 |