JP3702571B2 - Protective liner for the blast furnace hearth - Google Patents

Protective liner for the blast furnace hearth Download PDF

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Publication number
JP3702571B2
JP3702571B2 JP07154597A JP7154597A JP3702571B2 JP 3702571 B2 JP3702571 B2 JP 3702571B2 JP 07154597 A JP07154597 A JP 07154597A JP 7154597 A JP7154597 A JP 7154597A JP 3702571 B2 JP3702571 B2 JP 3702571B2
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Japan
Prior art keywords
furnace
blast furnace
protective liner
plate
stave
Prior art date
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Expired - Fee Related
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JP07154597A
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Japanese (ja)
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JPH10265814A (en
Inventor
弘 金谷
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JFE Steel Corp
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JFE Steel Corp
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Publication of JPH10265814A publication Critical patent/JPH10265814A/en
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Description

【0001】
【発明の属する技術分野】
本発明は、高炉炉口部の保護ライナに関し、詳しくは、高炉炉口部に設けられた冷却壁であるステーブを覆い、その耐久性を高めて寿命を延長させる保護ライナである。
【0002】
【従来の技術】
高炉の炉口部内壁は、炉頂から原料が装入される際に該原料が衝突したり、操業中の装入物降下で炉壁面を原料が滑り落ちるので、耐摩耗性が要求される。また、平均300℃から400℃の高温ガスに曝されるので、耐久性も要求される。そのため、例えば図7に示すように、ベルあるいはベルレス・シュートといった炉頂装入装置(図示せず)から炉内へ装入された原料3が衝突する部位の鉄皮1内面側に、耐摩耗性材料で製作された鉱石受け金物2、別名ウェアリング・プレート(以下、単にウェアリング2という)を設け、該ウェアリング2に原料3が衝突するようにして、鉄皮1の保護を図っている。なお、該ウェアリング2は、支持金物4を介して鉄皮1に接続し、鉄皮1との間隙には、耐火物のキャスタブル5が充填してある。
【0003】
しかしながら、高炉操業においては、時として操業不調が発生し、800℃〜1000℃といった高温ガスが炉口部6まで達することがあり、さらには一時的にせよ、該ウェアリング2の耐熱温度を超えるような条件にもなりうる。従って、長期間にわたる高炉の稼働期間においては、該ウェアリング2に亀裂が発生したり、損耗あるいは剥離といったことが避けられない。このため、高炉の炉口部寿命は、火入れ後の数年程度であった。高炉炉口部の損傷が生じると、炉内における装入物の分布状態が不安定となり、炉内でのガス流分布が悪化するので、鉱石の還元状況を悪くし、生産性を低下させたり、炉口部6の鉄皮1そのものが熱変形や亀裂を生じ、ガス漏れ等が起きて高炉自体の寿命を短くするという影響がでる。
【0004】
そこで、このような高炉炉口部の問題に対処するため、従来より、様々な工夫がなされてきている。例えば、特開昭49−39503号公報や特開昭61−9508号公報は、前記ウェアリング2内に冷却水管を配設し、ウェアリング本体を冷却したり、あるいは該ウェアリング2に代えてステーブ9を採用することを開示している。これは、該本体が操業不調時に耐熱温度以上に達するのを防ぐものであり、炉口部6の寿命延長には効果がある。最近では、ウェアリング2やステーブ9の熱や摩耗による損傷を抑制し、耐久性を向上させるため、図5及び図6に示すように、それらの炉内側の面を覆う板状部材からなる保護ライナ7が使用されている。
【0005】
しかしながら、図5及び6に示した保護ライナ7は、上方の高炉鉄皮1にチェーン(通常2本で)8で支持するようにしているが、該ライナ7に原料3が衝突したり、高温ガスにさらされると、チェーン8が変形したり、切断することが多い。また、保護ライナ7は、所謂一枚物であるので、高温ガスの熱衝撃で応力が発生し、亀裂や変形が生じ、そのため、保護ライナ7と背面のステーブ9あるいはウェアリング2との間に隔間ができ、ステーブ9、ウェアリング2が炉内の高温ガスに直接さらされることになり、損傷の原因となる。従って、最近のように、炉体及び付帯設備の長寿命化技術が進歩して、高炉全体の寿命が10年を超え、20年に及ぶという状況から見ると、上記程度の技術では不十分である。
【0006】
【発明が解決しようとする課題】
本発明は、かかる事情に鑑み、炉口部のさらなる長寿命化が可能な高炉炉口部の保護ライナを提供することを目的としている。
【0007】
【課題を解決するための手段】
発明者は、上記目的を達成するため、従来の保護ライナの欠点を鋭意見直し、それが主として支持機能にあると結論した。そして、その改良を図ると共に、前記熱応力の緩和も配慮して、本発明を完成させた。
すなわち、本発明は、高炉鉄皮の炉口部位置に設置したステーブの炉内側を覆う板状部材からなる保護ライナであって、前記板状部材の上端をГ型の鈎部とし、該鈎部を前記ステーブの上端面に懸架させると共に、板状部材の一部に引張手段を取付け、該引張手段を鉄皮の外側面で固定してなることを特徴とする高炉炉口部の保護ライナである。
【0008】
また、本発明は、前記引張手段を、ステーブ内を貫通する保護筒を通したり、あるいはチェーンとしてなることを特徴とする高炉炉口部の保護ライナである。さらに、本発明は、前記板状部材を上下方向で複数に分割し、それぞれを互いにピン係合したり、あるいは前記板状部材を、合金鋼の鋳造品としてなることを特徴とする高炉炉口部の保護ライナでもある。
【0009】
本発明では、高炉炉口部に配置したステーブの保護ライナを、上記のような構造としたので、該ライナの支持が強固になる。また、高温ガスにさらされても、分割構造によって熱膨張による変形量を抑えているので、熱応力が緩和される。その結果、従来の保護ライナに比較すると、その耐久性は格段に向上し、ステーブの寿命を延長するばかりでなく、高炉自体の長期稼働が可能になる。
【0010】
【発明の実施の形態】
図1に、本発明に係る保護ライナ7を、炉口部6に配置したステーブ9に取り付けた状況を示す。ステーブ9は、図4に示すように、炉口部6の周囲に配置されており、、前記保護ライナ7は、そのステーブ9の炉内側の表面を覆う板状部材7を主体としている。
【0011】
まず、本発明は、該板状部材7の上端を、Г型に折り曲げられて鈎部10に形成し、ステーブ9の上端面に懸架されるようにした。また、板状部材7の幅方向の中央部には、図2に示すように、該板状部材7を炉外側に向けて引張り、高炉の鉄皮1に係止する引張手段11が備えてある。さらに、前記鈎部10の上端にも、図3に示すように、同様な引張手段11が取付けられている。この引張手段11は、高温ガスからの熱を遮るよう、耐熱性材料からなる筒12に収められている。本発明では、この筒12自体が、高温ガスにさらされないように、前記ステーブ9に設けられた貫通孔13を通して鉄皮1の外側まで延びている。そして、鉄皮1の外側から前記引張手段11の張りを調整できるように、該筒12の後端は開口されている。もっとも、この開口は、通常、キャップ14で塞がれている。以上述べたような構造にしたので、本発明に係る保護ライナ7は、従来のものより高温下での支持が強固になり、耐久性が増したのである。
【0012】
なお、板状部材7の材質は、合金鋼が好ましく、特に高Cr,高Niの鋳造品であると一層良い。また、前記引張手段11としては、上記材質のリンクを結合したもので良く、通常はチェーンで十分である。
次に、本発明では、上記の構造に加え、板状部材7を上下方向で複数に分割した。それは、高温下で該板状部材7が熱膨張した際、膨張量を抑制し、熱応力の発生を緩和するためである。これによって、該板状部材7の変形や亀裂発生が抑えられ、より一層耐久性が増加する
すなわち、図5に示した保護ライナ7を、5000m3 級高炉の炉口部に採用した結果は、5〜6年の寿命である。本発明は、従来の保護ライナ7の欠点を、上記のように改善したので、少なくとも2〜3倍程度の寿命延長があるものと予想される。なお、上記5000m3 級高炉では、通常、炉頂ガス温度が150℃で、原料3は、ベルレス方式の装入装置を用いて、鉱石及びコークスを合計20、000〜25、000トン/日のペースで装入されている。
【0013】
【発明の効果】
以上述べたように、本発明により、従来5〜6年しかもたなかった高炉炉口部の保護ライナが、大幅にその寿命を延長できるようになる。その結果、以前より延長した高炉自体の寿命とほぼ同等となり、高炉稼働中での交換、補修等が不要となり、高炉操業に多大な貢献をするものと期待される。
【図面の簡単な説明】
【図1】本発明に係る保護ライナを、炉口部のステーブに取り付けた縦断面図である。
【図2】図1のA−A矢視図である。
【図3】図1のB−B矢視図である。
【図4】炉口部のステーブ配置を示す平面図である。
【図5】従来のステーブに取り付けた保護ライナを示す縦断面図である。
【図6】従来のウェアリング・プレートに取り付けた保護ライナを示す縦断面図である。
【図7】ウアリング・プレートの取付けを説明した縦断面図である。
【符号の説明】
1 鉄皮
2 鉱石受け金物(ウェアリング)
3 原料
4 支持金物
5 キャスタブル
6 炉口部
7 保護ライナ(板状部材)
8 チェーン
9 ステーブ
10 鈎部
11 引張手段
12 筒
13 貫通孔
14 キャップ
[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a protective liner for a blast furnace furnace port, and in particular, is a protective liner that covers a stave, which is a cooling wall provided in the blast furnace furnace port, to enhance its durability and extend its life.
[0002]
[Prior art]
The inner wall of the blast furnace mouth portion is required to have wear resistance because the raw material collides when the raw material is charged from the top of the furnace or the raw material slides down the furnace wall surface due to a charge drop during operation. Further, since it is exposed to a high-temperature gas having an average of 300 ° C. to 400 ° C., durability is also required. Therefore, for example, as shown in FIG. 7, wear resistance is applied to the inner surface of the iron skin 1 where the raw material 3 charged into the furnace collides from a furnace top charging device (not shown) such as a bell or a bellless chute. An ore receiver 2, also known as a wear ring plate (hereinafter simply referred to as a wear ring 2) made of a material, is provided so that the raw material 3 collides with the wear ring 2 to protect the iron skin 1. Yes. The wear ring 2 is connected to the iron skin 1 via a support metal 4, and a refractory castable 5 is filled in the gap with the iron skin 1.
[0003]
However, in blast furnace operation, operation failure sometimes occurs, and high-temperature gas such as 800 ° C. to 1000 ° C. may reach the furnace port 6, and even temporarily, exceeds the heat resistance temperature of the wear ring 2. It can be a condition like this. Therefore, during the operation period of the blast furnace for a long time, the wear ring 2 is inevitably cracked, worn or peeled off. For this reason, the life of the blast furnace was about several years after firing. If damage to the blast furnace furnace port occurs, the distribution of the charge in the furnace becomes unstable and the gas flow distribution in the furnace deteriorates, reducing the ore reduction status and reducing productivity. The iron shell 1 itself of the furnace port 6 itself is thermally deformed and cracked, causing gas leakage and the like to shorten the life of the blast furnace itself.
[0004]
In order to cope with such a problem of the blast furnace furnace opening, various devices have been conventionally made. For example, JP-A-49-39503 and JP-A-61-9508 disclose that a cooling water pipe is disposed in the wear ring 2 to cool the wear ring body or to replace the wear ring 2. The use of stave 9 is disclosed. This prevents the main body from reaching the heat-resistant temperature or higher when the operation is not successful, and is effective in extending the life of the furnace port 6. Recently, in order to suppress damage due to heat and wear of the wear ring 2 and the stave 9 and to improve durability, as shown in FIG. 5 and FIG. 6, a protection composed of a plate-like member covering the inner surface of the furnace. A liner 7 is used.
[0005]
However, although the protective liner 7 shown in FIGS. 5 and 6 is supported on the upper blast furnace core 1 by a chain (usually two) 8, the raw material 3 collides with the liner 7 or the high temperature is high. When exposed to gas, the chain 8 is often deformed or cut. Further, since the protective liner 7 is a so-called single piece, a stress is generated by a thermal shock of a high-temperature gas, and cracks and deformation occur. Therefore, between the protective liner 7 and the stave 9 or the wear ring 2 on the back surface. A gap is formed, and the stave 9 and the wear ring 2 are directly exposed to the hot gas in the furnace, which causes damage. Therefore, as seen from the situation that the life extension of the furnace body and incidental equipment has recently progressed and the life of the entire blast furnace exceeds 10 years and reaches 20 years, the above-mentioned techniques are not sufficient. is there.
[0006]
[Problems to be solved by the invention]
In view of such circumstances, an object of the present invention is to provide a protective liner for a blast furnace furnace port part capable of further extending the life of the furnace port part.
[0007]
[Means for Solving the Problems]
In order to achieve the above object, the inventor intensively reviewed the drawbacks of the conventional protective liner and concluded that it is mainly in the support function. The present invention was completed in consideration of the improvement and the relaxation of the thermal stress.
That is, the present invention is a protective liner composed of a plate-like member that covers the furnace inside of a stave installed at the furnace port portion position of the blast furnace iron skin, and the upper end of the plate-like member is a Г-type flange, A protective liner for a blast furnace furnace port portion, wherein a tension means is attached to a part of a plate-like member, and the tension means is fixed to the outer surface of the iron skin. It is.
[0008]
Further, the present invention is the protective liner for a blast furnace furnace port portion, wherein the pulling means is passed through a protective cylinder penetrating the stave or as a chain. Further, according to the present invention, the plate-shaped member is divided into a plurality of parts in the vertical direction, and each of them is pin-engaged with each other, or the plate-shaped member is made of a cast alloy steel, It is also a protective liner for the department.
[0009]
In the present invention, since the protective liner for the stave disposed at the blast furnace opening is structured as described above, the support of the liner is strengthened. Even when exposed to a high-temperature gas, since the amount of deformation due to thermal expansion is suppressed by the divided structure, the thermal stress is relieved. As a result, compared to conventional protective liners, its durability is greatly improved, not only extending the life of the stave, but also allowing the blast furnace itself to operate for a long time.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 shows a situation in which a protective liner 7 according to the present invention is attached to a stave 9 disposed at the furnace port 6. As shown in FIG. 4, the stave 9 is disposed around the furnace port portion 6, and the protective liner 7 is mainly composed of a plate-like member 7 that covers the surface of the stave 9 inside the furnace.
[0011]
First, according to the present invention, the upper end of the plate-like member 7 is bent into a Γ shape to form the flange portion 10 and is suspended on the upper end surface of the stave 9. Further, as shown in FIG. 2, a tension means 11 for pulling the plate-like member 7 toward the outside of the furnace and locking it to the iron shell 1 of the blast furnace is provided at the center of the plate-like member 7 in the width direction. is there. Further, as shown in FIG. 3, the same pulling means 11 is attached to the upper end of the flange portion 10. The tension means 11 is housed in a cylinder 12 made of a heat resistant material so as to block heat from the high temperature gas. In the present invention, the cylinder 12 itself extends to the outside of the iron skin 1 through the through hole 13 provided in the stave 9 so as not to be exposed to the high temperature gas. The rear end of the cylinder 12 is opened so that the tension of the tension means 11 can be adjusted from the outside of the iron skin 1. However, this opening is normally closed with a cap 14. Since the structure as described above is employed, the protective liner 7 according to the present invention has a stronger support at a higher temperature than the conventional one, and has increased durability.
[0012]
The material of the plate-like member 7 is preferably alloy steel, and more preferably a cast product with high Cr and high Ni. The pulling means 11 may be a combination of the above-mentioned links, and a chain is usually sufficient.
Next, in the present invention, in addition to the above structure, the plate-like member 7 is divided into a plurality of parts in the vertical direction. This is because when the plate-like member 7 is thermally expanded at a high temperature, the amount of expansion is suppressed and the generation of thermal stress is alleviated. Thereby, deformation and crack generation of the plate-like member 7 are suppressed, and durability is further increased. That is, the result of adopting the protective liner 7 shown in FIG. 5 in the furnace port portion of the 5000 m 3 class blast furnace is as follows. It has a lifetime of 5-6 years. Since the present invention has improved the drawbacks of the conventional protective liner 7 as described above, it is expected that there will be at least a 2-3 times longer life. In the above-mentioned 5000 m 3 class blast furnace, the top gas temperature is usually 150 ° C., and the raw material 3 is made up of a total of 20,000 to 25,000 tons / day of ore and coke using a bell-less charging device. It is charged at a pace.
[0013]
【The invention's effect】
As described above, according to the present invention, the protective liner for the blast furnace furnace port portion, which has conventionally been only 5 to 6 years, can greatly extend its life. As a result, the life of the blast furnace is extended to be almost the same as before, and replacement and repair during operation of the blast furnace are unnecessary, which is expected to greatly contribute to blast furnace operation.
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional view of a protective liner according to the present invention attached to a stave of a furnace port portion.
FIG. 2 is a view taken in the direction of arrows AA in FIG.
FIG. 3 is a view taken along arrow BB in FIG. 1;
FIG. 4 is a plan view showing a stave arrangement of a furnace port portion.
FIG. 5 is a longitudinal sectional view showing a protective liner attached to a conventional stave.
FIG. 6 is a longitudinal sectional view showing a protective liner attached to a conventional wear ring plate.
FIG. 7 is a longitudinal sectional view explaining attachment of a waring plate.
[Explanation of symbols]
1 Iron skin 2 Ore receiving hardware (wearing)
3 Raw Material 4 Support Metal 5 Castable 6 Furnace Port 7 Protective Liner (Plate Member)
8 Chain 9 Stave 10 Hook 11 Pulling means 12 Tube 13 Through hole 14 Cap

Claims (5)

高炉鉄皮の炉口部位置に設置したステーブの炉内側を覆う板状部材からなる保護ライナであって、
前記板状部材の上端をГ型の鈎部とし、該鈎部を前記ステーブの上端面に懸架させると共に、板状部材の一部に引張手段を取付け、該引張手段を鉄皮の外側面で固定してなることを特徴とする高炉炉口部の保護ライナ。
A protective liner made of a plate-like member that covers the furnace inside of the stave installed at the furnace port position of the blast furnace iron skin,
The upper end of the plate-shaped member is a Γ-shaped flange, the flange is suspended from the upper end surface of the stave, and a tension means is attached to a part of the plate-shaped member, and the tension means is attached to the outer surface of the iron skin. A protective liner for a blast furnace furnace opening, which is fixed.
前記引張手段を、ステーブ内を貫通する保護筒を通してなることを特徴とする請求項1記載の高炉炉口部の保護ライナ。2. A protective liner for a blast furnace furnace opening according to claim 1, wherein the pulling means is passed through a protective cylinder penetrating the stave. 前記引張手段を、チェーンとしてなることを特徴とする請求項1又は2記載の高炉炉口部の保護ライナ。3. A protective liner for a blast furnace furnace opening according to claim 1 or 2, wherein the pulling means is a chain. 前記板状部材を上下方向で複数に分割し、それぞれを互いにピン係合してなることを特徴とする請求項1〜3いずれかに記載の高炉炉口部の保護ライナ。The protective liner for a blast furnace furnace port according to any one of claims 1 to 3, wherein the plate-like member is divided into a plurality of parts in the vertical direction and each is pin-engaged with each other. 前記板状部材を、合金鋼の鋳造品としてなることを特徴とする請求項1〜4記載の高炉炉口後の保護ライナ。The protective liner after the blast furnace furnace opening according to claim 1, wherein the plate-like member is a cast product of alloy steel.
JP07154597A 1997-03-25 1997-03-25 Protective liner for the blast furnace hearth Expired - Fee Related JP3702571B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP07154597A JP3702571B2 (en) 1997-03-25 1997-03-25 Protective liner for the blast furnace hearth

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Application Number Priority Date Filing Date Title
JP07154597A JP3702571B2 (en) 1997-03-25 1997-03-25 Protective liner for the blast furnace hearth

Publications (2)

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JPH10265814A JPH10265814A (en) 1998-10-06
JP3702571B2 true JP3702571B2 (en) 2005-10-05

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