JP2001140011A - Repairing method of refractory in converter - Google Patents
Repairing method of refractory in converterInfo
- Publication number
- JP2001140011A JP2001140011A JP32161499A JP32161499A JP2001140011A JP 2001140011 A JP2001140011 A JP 2001140011A JP 32161499 A JP32161499 A JP 32161499A JP 32161499 A JP32161499 A JP 32161499A JP 2001140011 A JP2001140011 A JP 2001140011A
- Authority
- JP
- Japan
- Prior art keywords
- converter
- slag
- refractory
- lance
- angle
- 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
Links
Landscapes
- Carbon Steel Or Casting Steel Manufacturing (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、転炉耐火物の補修
方法に関するものである。The present invention relates to a method for repairing converter refractories.
【０００２】[0002]
【従来の技術】転炉耐火物の補修方法としては、図１〜
図３に示す方法がある。2. Description of the Related Art As a method for repairing a converter refractory, FIGS.
There is a method shown in FIG.
【０００３】図１は、炉体を傾動することにより、スラ
グをコーティングする方法を示す説明図であり、出鋼終
了後に転炉内に残留させたスラグ３を、転炉１の略中心
位置にあるトラニオン軸２を中心にして転炉１を傾動さ
せることにより、転炉内壁にスラグ３をコーティングす
る方法である。しかしながら、トラニオン軸２と平行な
炉壁内面側はコーティングができても、トラニオン軸２
と直交する炉壁内面側のコーティングが困難である。FIG. 1 is an explanatory view showing a method of coating slag by tilting a furnace body. A slag 3 remaining in a converter after the end of tapping is placed at a substantially central position of the converter 1. This is a method of coating the slag 3 on the inner wall of the converter by tilting the converter 1 around a certain trunnion shaft 2. However, even if the inner surface of the furnace wall parallel to the trunnion shaft 2 is coated,
It is difficult to coat the inside of the furnace wall orthogonal to the above.
【０００４】図２は、底吹きによるスラグスプラッシュ
コーティング方法を示す説明図であり、転炉１の底部か
ら底吹きにより炉内に残留させたスラグ３を吹き上げ、
スプラッシュ４を発生させて転炉内部の耐火物をスラグ
３でコーティングする方法である。但し、本方法によれ
ば、吹き抜け現象等のため、発生するスプラッシュ４の
制御が困難である。FIG. 2 is an explanatory view showing a slag splash coating method by bottom blowing, in which slag 3 remaining in the furnace is blown up from the bottom of the converter 1 by bottom blowing.
This is a method of generating a splash 4 and coating the refractory inside the converter with the slag 3. However, according to this method, it is difficult to control the generated splash 4 due to a blow-by phenomenon or the like.
【０００５】図３は、上吹きランス５によるスラグスプ
ラッシュコーティング方法を示す概略説明図であり、図
１や図２の方法に比較して、スプラッシュ４の制御が容
易で、転炉内の耐火物の全面にスラグ３をコーティング
することが可能である。上記スラグスプラッシュコーテ
ィング法としては、特開平５−３３１５１８号公報，特
開平８−２４６０１８号公報，特開平９−２９１３０５
号公報等に開示されている。しかしながら、従来のスラ
グスプラッシュコーティング法では転炉の炉底耐火物が
損傷することがあり、このような炉底耐火物の損傷を引
き起こすことのない方法の開発が要望されていた。FIG. 3 is a schematic explanatory view showing a slag splash coating method using the upper blowing lance 5. As compared with the method shown in FIGS. 1 and 2, the control of the splash 4 is easier and the refractory in the converter is improved. Can be coated with the slag 3 over the entire surface. Examples of the slag splash coating method include JP-A-5-331518, JP-A-8-246018, and JP-A-9-291305.
No. 6,009,036. However, the conventional slag splash coating method may damage the furnace bottom refractory of the converter, and there has been a demand for the development of a method that does not cause such damage to the furnace bottom refractory.
【０００６】[0006]
【発明が解決しようとする課題】本発明は上記事情に着
目してなされたものであって、スラグスプラッシュの制
御が比較的容易な上吹きランス等の昇降ランスによるス
ラグスプラッシュコーティング方法を前提として、転炉
の炉底耐火物の損傷を防止することのできる転炉耐火物
の補修方法を提供しようとするものである。SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and is based on a slag splash coating method using an up-and-down lance such as an upper blowing lance in which slag splash control is relatively easy. An object of the present invention is to provide a method of repairing a converter refractory that can prevent damage to a furnace bottom refractory of a converter.
【０００７】[0007]
【課題を解決するための手段】上記課題を解決した本発
明とは、出鋼終了後、転炉内に残留させたスラグに昇降
ランスからガスを吹きつけ、スラグを飛散させて転炉内
耐火物のコーティングを行う転炉耐火物の補修方法にお
いて、上記昇降ランスが円筒状であって、下方端側の底
部の外周近傍に複数のノズル孔を有し、上記昇降ランス
の軸芯とノズル孔の軸芯とがなす角度（俯角）が１６°
以上２６°以下であるものを用いることを要旨とするも
のである。According to the present invention, which has solved the above-mentioned problems, after the end of tapping, a gas is blown from a lifting lance to slag remaining in the converter to disperse the slag, thereby making the refractory inside the converter. In the method for repairing a refractory for a converter for coating a refractory material, the elevating lance is cylindrical, and has a plurality of nozzle holes near the outer periphery of a bottom portion on a lower end side, and the axis of the elevating lance and the nozzle hole Angle (depression angle) between the axis and the center
The gist of the invention is to use a material having an angle of 26 ° or less.
【０００８】[0008]
【発明の実施の形態】本発明者らは、昇降ランスによる
スラグスプラッシュコーティング方法を前提として、転
炉の炉底耐火物の損傷を防止することのできる転炉耐火
物の補修方法を開発すべく鋭意研究を重ねた。その結
果、ランスの軸芯とノズル孔の軸芯とがなす角度を制御
することが炉底耐火物の損傷防止に非常に効果的である
ことを突き止め本発明に想到した。具体的には、下方端
側の底部の外周近傍に複数のノズル孔を有する円筒状の
昇降ランスにおいて、上記昇降ランスの軸芯とノズル孔
の軸芯とがなす角度（図４参照：以下、ノズル角度αと
いう）を１６°以上にすることにより、転炉の炉底耐火
物の損傷を防止できるとの知見に基づくものである。但
し、上記ノズル角度αが大き過ぎると、炉壁へスラグを
付着させることが困難となるので、２６°以下に設定す
ることが必要である。BEST MODE FOR CARRYING OUT THE INVENTION The present inventors have developed a method of repairing a converter refractory which can prevent damage to a furnace bottom refractory of a converter on the premise of a slag splash coating method using a lifting lance. We continued our research. As a result, the present inventors have found that controlling the angle between the axis of the lance and the axis of the nozzle hole is extremely effective in preventing damage to the furnace bottom refractory, and reached the present invention. Specifically, in a cylindrical elevating lance having a plurality of nozzle holes near the outer periphery of the bottom portion on the lower end side, an angle formed between the axis of the elevating lance and the axis of the nozzle holes (see FIG. By setting the nozzle angle α to 16 ° or more, it is based on the finding that damage to the refractory at the bottom of the converter can be prevented. However, if the nozzle angle α is too large, it becomes difficult to attach slag to the furnace wall, so it is necessary to set the nozzle angle to 26 ° or less.
【０００９】図５は、ノズル角度αとスラグ付着量の関
係を示すグラフであり、転炉の炉底耐火物の損傷を防止
する上では、上記角度を１６°以上とし、炉壁へスラグ
を付着させるには上記角度を２６°以下に設定すべきこ
とが分かる。尚、上記角度は１８°以上、２５°以下が
夫々好ましい。FIG. 5 is a graph showing the relationship between the nozzle angle α and the amount of slag deposition. In order to prevent damage to the refractory at the bottom of the converter, the angle is set to 16 ° or more and slag is applied to the furnace wall. It can be seen that the angle should be set to 26 ° or less in order to adhere. The angle is preferably 18 ° or more and 25 ° or less.
【００１０】またランス先端とスラグ面との距離は、１
３００〜３５００ｍｍであることが望ましい。その理由
は、上記距離が短過ぎると、転炉の炉底耐火物の損傷を
招く恐れがあり、上記距離が長過ぎるとスプラッシュを
発生させることができなくなるからである。The distance between the lance tip and the slag surface is 1
Desirably, it is 300 to 3500 mm. The reason for this is that if the distance is too short, the refractory of the bottom of the converter may be damaged, and if the distance is too long, splash cannot be generated.
【００１１】更に、スラグを飛散させるためのガス流量
は、１８０００〜４２０００Ｎｍ3／ｈｒであることが
望ましい。その理由は、上記ガス流量が少な過ぎると、
十分なスプラッシュを発生させることができずにスラグ
コーティング量が少なくなり、また転炉の上部までスプ
ラッシュを吹き飛ばすことができなくなり、一方上記ガ
ス流量が多過ぎると、スプラッシュの発生に関する効果
が飽和すると共に、無駄にガスを使用することになるか
らである。Further, the gas flow rate for scattering the slag is desirably 18000 to 42000 Nm 3 / hr. The reason is that if the gas flow rate is too low,
The amount of slag coating is reduced because sufficient splash cannot be generated, and the splash cannot be blown off to the upper part of the converter.On the other hand, if the gas flow rate is too large, the effect on generation of splash is saturated and This is because gas is wasted.
【００１２】以下、本発明を実施例によって更に詳細に
説明するが、下記実施例は本発明を限定する性質のもの
ではなく、前・後記の主旨に基づいて設計変更すること
はいずれも本発明の技術的範囲内に含まれるものであ
る。Hereinafter, the present invention will be described in more detail with reference to Examples. However, the following Examples do not limit the present invention, and any design changes based on the preceding and following gist will be described. Are included within the technical scope of
【００１３】[0013]
【実施例】２４０トン転炉で出鋼後、上吹きランスから
窒素ガスを吹きつけた。ガス吹きつけ後、スラグを排出
してからスラグ付着量と炉底耐火物損傷量を測定した。
実施条件を表１に示す。EXAMPLES After tapping in a 240 ton converter, nitrogen gas was blown from the top blowing lance. After the gas was blown, the slag was discharged, and then the slag adhesion amount and the furnace bottom refractory damage amount were measured.
The operating conditions are shown in Table 1.
【００１４】[0014]
【表１】 [Table 1]
【００１５】ノズル角度が１６°未満のＮｏ．１〜３で
は、炉底の耐火物に損傷が見られた。これは、窒素ガス
の冷却効果により、耐火物が急激に冷却されたため、ス
ポーリングを起こし、剥離が発生したものと推定され
る。When the nozzle angle is less than 16 °, In Nos. 1 to 3, damage was observed in the refractory at the furnace bottom. This is presumably because the refractory was rapidly cooled by the cooling effect of the nitrogen gas, causing spalling and peeling.
【００１６】ノズル角度が２６°を超えるＮｏ．１２〜
１３では、壁部へのスラグ付着がほとんど確認されなか
った。これは、窒素ガスの衝突エネルギーが分散された
為、スラグが飛散しなかったものと考えられる。When the nozzle angle exceeds 26 ° No. 12 ~
In No. 13, adhesion of slag to the wall was hardly confirmed. This is considered to be because the slag was not scattered because the collision energy of the nitrogen gas was dispersed.
【００１７】これに対して、ノズル角度が１６〜２６°
である本発明例Ｎｏ．４〜１１では、炉底を損傷するこ
となく十分なスラグを付着させることができた。On the other hand, when the nozzle angle is 16 to 26 °
Inventive Example No. In Nos. 4 to 11, sufficient slag could be attached without damaging the furnace bottom.
【００１８】[0018]
【発明の効果】本発明は以上の様に構成されているの
で、スラグスプラッシュの制御が比較的容易な昇降ラン
スによるスラグスプラッシュコーティング方法におい
て、転炉の炉底耐火物の損傷を防止することのできる転
炉耐火物の補修方法が提供できることとなった。Since the present invention is configured as described above, it is possible to prevent damage to the refractory at the bottom of a converter in a slag splash coating method using a lifting lance in which slag splash control is relatively easy. It is possible to provide a method for repairing converter refractories that can be performed.
【図１】炉体の傾動によりスラグコーティングを行う方
法を示す説明図である。FIG. 1 is an explanatory view showing a method of performing slag coating by tilting a furnace body.
【図２】底吹きによるスラグスプラッシュコーティング
方法を示す説明図である。FIG. 2 is an explanatory view showing a slag splash coating method by bottom blowing.
【図３】上吹きランスによるスラグスプラッシュコーテ
ィング方法を示す説明図である。FIG. 3 is an explanatory view showing a slag splash coating method using a top blowing lance.
【図４】ノズル角度の説明図である。FIG. 4 is an explanatory diagram of a nozzle angle.
【図５】ノズル角度αとスラグ付着量の関係を示すグラ
フである。FIG. 5 is a graph showing a relationship between a nozzle angle α and a slag adhesion amount.
１ 転炉 ２ トラニオン軸 ３ スラグ ４ スプラッシュ ５ 上吹きランス 1 converter 2 trunnion shaft 3 slag 4 splash 5 top blowing lance
Claims (1)
に昇降ランスからガスを吹きつけ、スラグを飛散させて
転炉内耐火物のコーティングを行う転炉耐火物の補修方
法において、 上記昇降ランスが円筒状であって、下方端側の底部の外
周近傍に複数のノズル孔を有し、上記昇降ランスの軸芯
とノズル孔の軸芯とがなす角度が１６°以上２６°以下
であることを特徴とする転炉耐火物の補修方法。1. A method for repairing a refractory for a converter, wherein after the end of tapping, a gas is blown from a lifting lance to slag remaining in the converter to scatter the slag and coat the refractory in the converter. The elevating lance is cylindrical, and has a plurality of nozzle holes near the outer periphery of the bottom on the lower end side, and the angle between the axis of the elevating lance and the axis of the nozzle holes is 16 ° or more and 26 ° or less. A method for repairing a refractory converter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP32161499A JP3696010B2 (en) | 1999-11-11 | 1999-11-11 | How to repair converter refractories |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP32161499A JP3696010B2 (en) | 1999-11-11 | 1999-11-11 | How to repair converter refractories |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2001140011A true JP2001140011A (en) | 2001-05-22 |
| JP3696010B2 JP3696010B2 (en) | 2005-09-14 |
Family
ID=18134501
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP32161499A Expired - Lifetime JP3696010B2 (en) | 1999-11-11 | 1999-11-11 | How to repair converter refractories |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3696010B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2022001874A1 (en) * | 2020-06-29 | 2022-01-06 | 宝山钢铁股份有限公司 | Slag-splashing fettling method |
-
1999
- 1999-11-11 JP JP32161499A patent/JP3696010B2/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2022001874A1 (en) * | 2020-06-29 | 2022-01-06 | 宝山钢铁股份有限公司 | Slag-splashing fettling method |
| CN113930574A (en) * | 2020-06-29 | 2022-01-14 | 宝山钢铁股份有限公司 | Slag splashing fettling method beneficial to furnace bottom maintenance |
| CN113930574B (en) * | 2020-06-29 | 2022-12-16 | 宝山钢铁股份有限公司 | Slag splashing fettling method beneficial to furnace bottom maintenance |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3696010B2 (en) | 2005-09-14 |
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