JP2018178223A - Blast furnace pivoted chute - Google Patents

Blast furnace pivoted chute Download PDF

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JP2018178223A
JP2018178223A JP2017082795A JP2017082795A JP2018178223A JP 2018178223 A JP2018178223 A JP 2018178223A JP 2017082795 A JP2017082795 A JP 2017082795A JP 2017082795 A JP2017082795 A JP 2017082795A JP 2018178223 A JP2018178223 A JP 2018178223A
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chute
blast furnace
heat insulating
insulating material
furnace
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JP6917181B2 (en
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展英 梨本
Nobuhide Nashimoto
展英 梨本
孝紀 金津
Takanori Kanatsu
孝紀 金津
洋文 新田
Hirofumi Nitta
洋文 新田
知輝 尾形
Tomoaki Ogata
知輝 尾形
渡辺 和好
Kazuyoshi Watanabe
和好 渡辺
平尾 裕二
Yuji Hirao
裕二 平尾
俊治 古谷
Toshiharu Furuya
俊治 古谷
夕聖 梶原
Yusei Kajiwara
夕聖 梶原
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Nippon Steel Corp
Nippon Steel Engineering Co Ltd
Nippon Steel Plant Designing Corp
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Nippon Steel and Sumitomo Metal Corp
NS Plant Designing Corp
Nippon Steel and Sumikin Engineering Co Ltd
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Abstract

PROBLEM TO BE SOLVED: To provide a blast furnace pivoted chute with a chute body having improved deformation resistance for an extended life.SOLUTION: A blast furnace pivoted chute 10 for charging iron ore and/or coke into a blast furnace has a plurality of reinforcing ribs 12 arranged in grid patterns on a part or the whole of an outer side surface 11b of a chute body 11. The region where the reinforcing ribs 12 are disposed is covered with a heat insulating material 15. Deformation of the chute body 11 can be suppressed as compared with conventional furnace pivoted chutes, and it is possible to extend the life of the furnace pivoted chut.SELECTED DRAWING: Figure 1

Description

本発明は、高炉炉内に原料等を装入する高炉炉内旋回シュートに関する。   The present invention relates to a revolving chute in a blast furnace that charges raw materials and the like into the blast furnace.

高炉炉内に原料等を装入する際には、炉頂部に設置した高炉炉内旋回シュート(以下、単に「炉内旋回シュート」と呼ぶことがある。)を用い、シュート内で原料等を滑落させることにより炉内に原料等を装入している。
上記炉内旋回シュートは、炉内から炉頂へ吹き上がる最高1000℃のガスにさらされるため劣化が激しく、定期的な交換が必要であるが、炉内旋回シュートの取替えの際には高炉を休風しなければならない。従って、高炉の生産性向上には炉内旋回シュートの取替え頻度を低減する必要があり、炉内旋回シュートの寿命向上が課題となる。
When charging raw materials and the like into the blast furnace, the rotary chute in the blast furnace installed at the top of the furnace (hereinafter, may be simply referred to as “pivot chute”) may be used to feed the raw materials and the like in the chute. Raw materials are charged into the furnace by sliding down.
The above-mentioned in-core swirl chute is severely deteriorated because it is exposed to a gas of up to 1000 ° C. blowing from the inside of the furnace to the top of the furnace, and periodical replacement is necessary. I have to rest. Therefore, in order to improve the productivity of blast furnaces, it is necessary to reduce the frequency of replacement of the in-core swirl chute, and the improvement in the life of the in-furnace swirl chute is an issue.

上記課題に対して、例えば特許文献1には、シュート下部に別吊りの防熱カバーを設置し、炉内高温上昇ガスがシュートに直接当たらないようにすることにより、シュートの熱損傷を最小限にする技術が開示されている。
また、特許文献2には、シュート内面にセラミックスをライニングすることにより、シュート内面の耐摩耗性が改善できることが記載されている。また、特許文献2の第2図には、シュート内側面の長手方向に沿って複数のガイドを設置することが図示されている。当該ガイドは、シュートの強度を高める効果を奏するものと考えられる。
In order to minimize the thermal damage of the chute, for example, in the patent document 1, another heat insulation cover is provided at the lower part of the chute to prevent the high temperature rising gas in the furnace from directly hitting the chute. Technology is disclosed.
Further, Patent Document 2 describes that the wear resistance of the inner surface of the chute can be improved by lining the inner surface of the chute with a ceramic. Further, in FIG. 2 of Patent Document 2, installation of a plurality of guides along the longitudinal direction of the inner surface of the chute is illustrated. The guide is considered to have the effect of enhancing the strength of the chute.

特開平9−71803号公報JP-A-9-71803 特開昭63−274708号公報Japanese Patent Application Laid-Open No. 63-274708

しかしながら、特許文献1に記載されている防熱カバーを設置した程度ではシュートの変形が抑制できないという問題がある。
また、特許文献2記載の技術によれば、一定の変形抑制効果が期待できると考えられたが、シュート本体の変形が抑制できず、寧ろ変形が顕著となる場合があるという知見を本発明者らは得た。
However, there is a problem that the deformation of the chute can not be suppressed to such an extent that the heat insulating cover described in Patent Document 1 is installed.
In addition, according to the technology described in Patent Document 2, although it was thought that a certain deformation suppressing effect can be expected, the present inventor has found that the deformation of the chute main body can not be suppressed and the deformation may become remarkable instead. Et al.

本発明はかかる事情に鑑みてなされたもので、シュート本体の耐変形性等が改善され、寿命向上が図れる高炉炉内旋回シュートを提供することを目的とする。   The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a revolving chute in a blast furnace in which the deformation resistance and the like of the chute body are improved and the life can be improved.

上記目的を達成するため、本発明は、高炉炉内に鉄鉱石及び/又はコークスを装入する高炉炉内旋回シュートであって、
シュート本体の外側面の一部又は全面に、複数の補強リブが格子状に配置され、前記補強リブが配置された領域が断熱材で覆い隠されていることを特徴としている。
In order to achieve the above object, the present invention is a blast furnace in-furnace swirl chute for charging iron ore and / or coke into a blast furnace.
A plurality of reinforcing ribs are arranged in a grid shape on a part or the entire surface of the outer surface of the chute body, and a region where the reinforcing ribs are arranged is covered with a heat insulating material.

本発明では、補強リブを格子状とすることにより、シュート本体の長手方向及び周方向(長手方向と直交する方向)の変形を拘束すると共に、補強リブと炉内雰囲気とを断熱材で遮断することにより、補強リブの熱応力を低減し、補強リブに起因するシュート本体の変形を防止する。   In the present invention, by forming the reinforcing ribs in a grid shape, the deformation in the longitudinal direction and the circumferential direction (direction orthogonal to the longitudinal direction) of the chute main body is restrained, and the reinforcing ribs and the atmosphere in the furnace are isolated by the heat insulating material. Thus, the thermal stress of the reinforcing rib is reduced, and the deformation of the chute body caused by the reinforcing rib is prevented.

本発明に係る高炉炉内旋回シュートによれば、従来の炉内旋回シュートに比べてシュート本体の変形を抑制することができ、炉内旋回シュートの長寿命化を図ることができる。   According to the revolving chute in a blast furnace according to the present invention, deformation of the chute body can be suppressed as compared with the conventional revolving chute, and the life of the revolving chute in the furnace can be extended.

また、本発明によるシュート本体の変形抑制効果は、シュートの偏摩耗量の減少にも効果が見られた。
従来の炉内旋回シュートでは、シュート本体の変形によって、シュート内を流下する原料の位置が、シュート内面の周方向の特定位置に固定される傾向があり、他の位置に比べて当該特定位置の摩耗が顕著に進む傾向があった。一方、シュート本体の変形が抑制される本発明に係る高炉炉内旋回シュートでは、原料の流下に伴う摩耗がシュート内面全体に分散されるため、シュートの偏摩耗を抑制することができる。
Further, the deformation suppressing effect of the chute body according to the present invention was also effective in reducing the amount of uneven wear of the chute.
In the conventional in-core turning chute, the position of the raw material flowing down the inside of the chute tends to be fixed at a specific position in the circumferential direction of the chute inner surface due to the deformation of the chute main body. There was a tendency for wear to progress significantly. On the other hand, in the turning chute in the blast furnace according to the present invention in which the deformation of the chute main body is suppressed, the wear accompanying the flow of the raw material is dispersed over the entire inner surface of the chute.

本発明の一実施の形態に係る高炉炉内旋回シュートの部分断面斜視図である。BRIEF DESCRIPTION OF THE DRAWINGS It is a partial cross-section perspective view of the turning chute in a blast-furnace furnace which concerns on one embodiment of this invention.

続いて、添付した図面を参照しつつ、本発明を具体化した実施の形態について説明し、本発明の理解に供する。   Next, embodiments of the present invention will be described with reference to the attached drawings for understanding of the present invention.

[高炉炉内旋回シュートの構成]
本発明の一実施の形態に係る高炉炉内旋回シュート10を図1に示す。
シュート本体11は断面U字状とされ、原料等(鉄鉱石及び/又はコークス)が流下する内側面11aには耐摩耗ライナー(図示省略)が内張されている。一方、シュート本体11の外側面11bには、シュート本体11の剛性を確保するため、断面矩形状とされた複数の補強リブ12が格子状に配置されている。補強リブ12を配置することでシュート本体11の断面係数が大きくなり、耐変形性が向上する。補強リブ12の材質としては耐熱ステンレスなどが好適である。
[Configuration of the revolving chute in the blast furnace]
A blast furnace inward revolving chute 10 according to an embodiment of the present invention is shown in FIG.
The chute body 11 is U-shaped in cross section, and a wear-resistant liner (not shown) is lined on the inner side surface 11a on which the raw material and the like (iron ore and / or coke) flow down. On the other hand, on the outer side surface 11b of the chute main body 11, in order to secure the rigidity of the chute main body 11, a plurality of reinforcing ribs 12 having a rectangular shape in cross section are arranged in a lattice shape. By arranging the reinforcing rib 12, the section coefficient of the chute main body 11 is increased, and the deformation resistance is improved. As a material of the reinforcing rib 12, heat-resistant stainless steel or the like is preferable.

格子状に配置された複数の補強リブ12は、外側面11bの周方向(シュート本体11の長手方向と直交する方向)に配置された周方向リブ13と、外側面11bの長手方向に配置された長手方向リブ14とから構成されている。補強リブ12を周方向及び長手方向に配置することで、周方向及び長手方向の剛性が大きくなり、あらゆる方向の変形を抑制することができる。なお、補強リブ12の本数は、周方向、長手方向とも3本以上が好ましい。   The plurality of reinforcing ribs 12 arranged in a grid shape are arranged in the longitudinal direction of the outer side surface 11b and the circumferential direction rib 13 arranged in the circumferential direction of the outer side surface 11b (direction orthogonal to the longitudinal direction of the chute main body 11) And a longitudinal rib 14. By arranging the reinforcing ribs 12 in the circumferential direction and the longitudinal direction, the rigidity in the circumferential direction and the longitudinal direction is increased, and deformation in any direction can be suppressed. The number of reinforcing ribs 12 is preferably three or more in both the circumferential direction and the longitudinal direction.

また、補強リブ12と補強リブ12の間の空間、及び補強リブ12の上面(外側面)部には断熱材15が配置され、補強リブ12が配置された領域が断熱材15で覆い隠されている。断熱材15にはセラミックスファイバー等を使用することができる。
断熱材15が剥落しないように、断熱材15の外側には鋼製の断熱材カバー16が配置され、断熱材15を覆っている。
Further, the heat insulating material 15 is disposed in the space between the reinforcing rib 12 and the reinforcing rib 12 and on the upper surface (outside surface) of the reinforcing rib 12, and the region where the reinforcing rib 12 is disposed is covered with the heat insulating material 15. ing. A ceramic fiber or the like can be used as the heat insulating material 15.
A heat insulating material cover 16 made of steel is disposed outside the heat insulating material 15 so as to cover the heat insulating material 15 so that the heat insulating material 15 does not fall off.

[本発明の技術思想]
シュート本体の外側面に補強リブを配置することによりシュート本体の剛性が向上して外力に対する耐変形性が増すものの、シュート本体の外側面や補強リブが、炉内から放出されるガスにより高温になると、原料温度である内側面との温度(熱膨張)差によってシュート本体に熱応力が発生し、シュート本体が変形するという知見を本発明者らは得た。
[Technical thought of the present invention]
By arranging the reinforcing rib on the outer surface of the chute body, the rigidity of the chute body is improved and the resistance to external force is increased, but the outer surface of the chute body and the reinforcing rib are heated to a high temperature by the gas released from the furnace. Then, the present inventors obtained the knowledge that thermal stress is generated in the chute body due to a temperature (thermal expansion) difference from the inner surface which is the raw material temperature, and the chute body is deformed.

シュート本体の外側面が高温とならないようにするため、シュート本体の外側面のみに断熱材を配置したところ(補強リブの上面部には断熱材を配置せず)、シュート本体の変形は軽減できたが、補強リブ設置部位の熱応力が大きくなり、補強リブを起因とする変形が生じた。   When the heat insulating material is disposed only on the outer surface of the chute main body (the heat insulating material is not disposed on the upper surface of the reinforcing rib) in order to prevent the outer surface of the chute main body from becoming hot, deformation of the chute main body can be reduced. However, the thermal stress at the location where the reinforcing rib was installed became large, and the deformation caused by the reinforcing rib occurred.

そこで、補強リブの上面部を含めたシュート本体の外側面全体を断熱材で覆ったところ、補強リブ設置部位の熱応力を小さく抑えることができ、結果的に、シュート本体の変形を抑制できることが判明した。   Therefore, when the entire outer surface of the chute main body including the upper surface portion of the reinforcing rib is covered with the heat insulating material, the thermal stress of the reinforcing rib installation site can be suppressed small, and as a result, the deformation of the chute main body can be suppressed. found.

本発明者らが実験した炉内旋回シュートは、シュート本体の下部が他の部位に比べて熱流に直接さらされるため、シュート本体下部の変形の程度が著しかった。そのため、当該部位に補強リブを格子状に配置し、さらに補強リブが配置された領域を断熱材で覆い隠したところ、実用的な変形防止が達成できた。従って、シュート本体の外側面全体に補強リブと断熱材を配置してもよいが、シュート本体の高温部位のみに補強リブと断熱材を配置してもシュート本体の変形抑制効果が期待できる。   The degree of deformation of the lower part of the chute main body was remarkable because the lower part of the chute main body was directly exposed to the heat flow as compared with the other parts of the in-furnace turning chute which the present inventors have experimented. Therefore, when reinforcing ribs were arranged in a lattice at the portion and the area where the reinforcing ribs were arranged was covered with a heat insulating material, practical deformation prevention could be achieved. Therefore, although the reinforcing rib and the heat insulating material may be disposed on the entire outer surface of the chute body, the effect of suppressing the deformation of the chute body can be expected even if the reinforcing rib and the heat insulating material are disposed only on the high temperature portion of the chute body.

以上、本発明の一実施の形態について説明してきたが、本発明は何ら上記した実施の形態に記載の構成に限定されるものではなく、特許請求の範囲に記載されている事項の範囲内で考えられるその他の実施の形態や変形例も含むものである。   As mentioned above, although one embodiment of the present invention has been described, the present invention is not limited to the configuration described in the above-described embodiment at all, and within the scope of the matters described in the claims. It also includes other possible embodiments and modifications.

本発明の効果について検証するために実施した検証試験について説明する。
シュート本体として板厚25mmのU字型シュート(シュート深さ:800mm、幅:1200mm)を使用し、シュート本体の外側面に板厚40mm、高さ60mmの補強リブを配置した。長手方向の補強リブは概ね等間隔で6本配置し、周方向の補強リブは概ね400mmの間隔で6本配置した。補強リブの材質は耐熱ステンレスとした。
断熱材には、厚さ約80mmのセラミックスファイバーブランケットを使用した。従って、補強リブをセラミックスファイバーブランケットで覆い隠した場合、補強リブ上面上のセラミックスファイバーブランケットの厚さは20mm程度となる。
また、断熱材が剥落しないように、断熱材の外側には鋼製の断熱材カバーが配置されている。
A verification test conducted to verify the effect of the present invention will be described.
A U-shaped chute (shoot depth: 800 mm, width: 1200 mm) with a thickness of 25 mm was used as the chute body, and reinforcing ribs with a thickness of 40 mm and a height of 60 mm were disposed on the outer side of the chute body. Six reinforcing ribs in the longitudinal direction were arranged at substantially equal intervals, and six reinforcing ribs in the circumferential direction were arranged at intervals of about 400 mm. The material of the reinforcing rib is heat resistant stainless steel.
A ceramic fiber blanket with a thickness of about 80 mm was used as the heat insulating material. Therefore, when the reinforcing rib is covered with the ceramic fiber blanket, the thickness of the ceramic fiber blanket on the upper surface of the reinforcing rib is about 20 mm.
In addition, a steel heat insulating material cover is disposed on the outside of the heat insulating material so that the heat insulating material does not fall off.

なお、本発明では、長手方向の補強リブの設置間隔(周方向長さ)は100mm〜450mm、周方向の補強リブの設置間隔(長手方向長さ)は250mm〜600mmを想定している。また、断熱材(セラミックファイバーブランケット)は、補強リブ上では5mm以上を想定している。上限は特に設けないが、他部位との寸法の兼ね合いのため、100mm以下が適切と考えられる。   In the present invention, it is assumed that the installation interval (circumferential length) of the reinforcing ribs in the longitudinal direction is 100 mm to 450 mm, and the installation interval (longitudinal length) of the reinforcing ribs in the circumferential direction is 250 mm to 600 mm. Moreover, the heat insulating material (ceramic fiber blanket) assumes 5 mm or more on a reinforcement rib. Although the upper limit is not particularly set, 100 mm or less is considered appropriate because of the balance of the dimensions with other parts.

実施例は、シュート本体の外側面に補強リブが格子状に配置され、補強リブが配置された領域が断熱材で覆い隠されている。
比較例1は、シュート本体の外側面に長手方向の補強リブのみが配置され、補強リブが配置された領域が断熱材で覆い隠されている。
比較例2は、シュート本体の外側面に補強リブが格子状に配置され、シュート外側面のみ断熱材で覆われ、補強リブの上面部には断熱材が配置されていない。
比較例3は、シュート本体の外側面に補強リブが格子状に配置され、断熱材は無しとされている。
In the embodiment, the reinforcing ribs are arranged in a lattice on the outer surface of the chute body, and the area where the reinforcing ribs are arranged is covered with the heat insulating material.
In Comparative Example 1, only the reinforcing ribs in the longitudinal direction are disposed on the outer side surface of the chute body, and the region where the reinforcing ribs are disposed is covered with the heat insulating material.
In Comparative Example 2, reinforcing ribs are arranged in a lattice on the outer side surface of the chute body, only the chute outer side surface is covered with the heat insulating material, and the heat insulating material is not arranged on the upper surface portion of the reinforcing rib.
In Comparative Example 3, reinforcing ribs are arranged in a grid shape on the outer surface of the chute body, and no heat insulating material is used.

炉内旋回シュートの使用期間を5ヶ月〜7ヶ月としてシュート本体の変形状況を目視で観察した。観察結果を表1に示す。   The deformation state of the chute body was visually observed with the usage period of the in-furnace turning chute as 5 months to 7 months. The observation results are shown in Table 1.

Figure 2018178223
Figure 2018178223

同表より以下のことがわかる。
・実施例では、シュート本体の変形もシュート内面の偏摩耗も認められなかった。
・比較例1では、シュート本体が周方向に変形し、シュート内面の底部長手方向が重点的に摩耗した。
・比較例2、3では、シュート本体が波打ち状に変形したため、シュート内面に配置した長方形ライナー(タイル状に配置)の端部に顕著な摩耗が観察された。シュート本体の複雑な変形により、隣接するライナー間で摩耗しやすい段差が発生したためと考えられる。
The following can be understood from the same table.
In the example, neither deformation of the chute body nor uneven wear of the chute inner surface was observed.
In the first comparative example, the chute body was deformed in the circumferential direction, and the bottom longitudinal direction of the chute inner surface was worn intensively.
In Comparative Examples 2 and 3, significant wear was observed at the end of the rectangular liner (arranged in a tile) disposed on the inner surface of the chute because the chute body was deformed in a wavy shape. It is considered that the complicated deformation of the chute body causes a step that is likely to be worn between the adjacent liners.

10:高炉炉内旋回シュート、11:シュート本体、11a:内側面、11b:外側面、12:補強リブ、13:周方向リブ、14:長手方向リブ、15:断熱材、16:断熱材カバー 10: blast furnace inside revolving chute, 11: chute main body, 11a: inside surface, 11b: outside surface, 12: reinforcing rib, 13: circumferential rib, 14: longitudinal rib, 15: heat insulating material, 16: heat insulating material cover

Claims (1)

高炉炉内に鉄鉱石及び/又はコークスを装入する高炉炉内旋回シュートであって、
シュート本体の外側面の一部又は全面に、複数の補強リブが格子状に配置され、前記補強リブが配置された領域が断熱材で覆い隠されていることを特徴とする高炉炉内旋回シュート。
A rotating chute in a blast furnace, wherein iron ore and / or coke are charged into the blast furnace,
A plurality of reinforcing ribs are arranged in a grid shape on a part or the entire surface of the outer surface of the chute body, and a region where the reinforcing ribs are arranged is covered with a heat insulating material, and the chute chute in the blast furnace .
JP2017082795A 2017-04-19 2017-04-19 Blast furnace swivel chute Active JP6917181B2 (en)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109988875A (en) * 2019-04-30 2019-07-09 柳州钢铁股份有限公司 Blast furnace material distribution chute

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109988875A (en) * 2019-04-30 2019-07-09 柳州钢铁股份有限公司 Blast furnace material distribution chute
CN109988875B (en) * 2019-04-30 2024-02-20 柳州钢铁股份有限公司 Blast furnace distributing chute

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