JPH0774367B2 - How to protect the center of the bottom of the blast furnace - Google Patents
How to protect the center of the bottom of the blast furnaceInfo
- Publication number
- JPH0774367B2 JPH0774367B2 JP2612689A JP2612689A JPH0774367B2 JP H0774367 B2 JPH0774367 B2 JP H0774367B2 JP 2612689 A JP2612689 A JP 2612689A JP 2612689 A JP2612689 A JP 2612689A JP H0774367 B2 JPH0774367 B2 JP H0774367B2
- Authority
- JP
- Japan
- Prior art keywords
- tio
- blast furnace
- coke
- furnace
- center
- 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.)
- Expired - Lifetime
Links
Landscapes
- Manufacture Of Iron (AREA)
Description
【発明の詳細な説明】 ［産業上の利用分野］ 本発明は高炉炉底の局部的な損傷部分，特に中心部の損
傷を効率良く保護する方法に関する ［従来技術と解決すべき課題］ 高炉の炉寿命を決定する最も大きな要因は炉底の損傷で
ある。このために，従来より砂鉄などのTiO2源を焼結原
料中に添加して焼結鉱を高炉に装入して炉底部にチタン
ベアーを形成させる炉底保護対策が講じられていた。し
かしながら，同方法では，炉底の局部的な損傷部に対し
ても，炉底全域にわたってチタンベアーを形成せざるを
得ず，しかもその部分TiO2源を多量に高炉に装入するた
めに通気性の悪化や出滓不良等の操業トラブルを起こす
ことが多かった。すなわち,TiO2源を多量装入した場合
に,TiO2源は炉内のコークスと反応してTiCやTiNを生成
し，そのTi化合物はコークスに選択的に付着するために
通気性を悪化させ，また未還元のTiO2もスラグ中に混入
するために排滓性を悪化させる原因となり，操業性に悪
影響を及ぼすことがあった。Description: TECHNICAL FIELD The present invention relates to a method for efficiently protecting a damaged portion of a blast furnace bottom, particularly, a damaged portion of a blast furnace bottom. [Prior art and problems to be solved] The most important factor that determines the life of a furnace is damage to the bottom of the furnace. For this reason, conventionally, a furnace bottom protection measure has been taken in which a TiO 2 source such as iron sand is added to the sintering raw material and the sinter is charged into the blast furnace to form a titanium bear at the furnace bottom. However, with this method, titanium bears must be formed over the entire area of the bottom of the furnace even for locally damaged parts of the bottom of the furnace, and moreover, the partial TiO 2 source must be vented in order to charge the blast furnace in large quantities. It often caused operational problems such as deterioration of sex and poor slag. That is, when a large amount of TiO 2 source is charged, the TiO 2 source reacts with the coke in the furnace to form TiC and TiN, and the Ti compound selectively adheres to the coke, which deteriorates the air permeability. Moreover, since unreduced TiO 2 is also mixed in the slag, it causes deterioration of slag waste, which may adversely affect operability.
このような問題を解決するには，例えば特開昭60−5600
4号公報や特開昭60−228611号公報に提案された，局部
的な損傷位置付近の羽口から粉状のチタン鉄鉱石を吹き
込む方法が有利である。しかし，これらの方法では，炉
壁側の損傷に対しては有効に作用するものの，炉中心部
の炉底保護にはそれ程効果が発現されるものではなく，
炉中心部の保護には，別異の方法の開発が望まれてい
た。To solve such a problem, for example, JP-A-60-5600
The method proposed by JP-A No. 4 and JP-A No. 60-228611, which blows powdery titanium iron ore from the tuyere in the vicinity of the locally damaged position is advantageous. However, although these methods are effective against damage on the furnace wall side, they are not so effective in protecting the hearth bottom of the furnace.
It was desired to develop a different method for protecting the central part of the furnace.
［発明の目的］ 本発明の目的は，前述の従来の羽口から吹込みでは，高
炉中心部の炉底保護は不十分であることから，通気性の
障害等を支障を生ずることなく効率的に炉底中心部を保
護する方法を提供する事である。[Object of the Invention] Since the purpose of the present invention is to protect the bottom of the center of the blast furnace by the above-mentioned conventional blowing from the tuyere, it is possible to efficiently perform the operation without causing a problem such as a ventilation problem. It is to provide a method for protecting the hearth bottom.
［本発明の構成］ 本発明は，高炉炉底中心部に埋設した炉底温度計の指示
値が上昇して炉底中心部の損傷が察知せられたさいに，
高炉装入原料中にTiO2源を増量して該炉底中心部を保護
する方法において，該TiO2源として,15〜3mmの粒度を有
するTiO2含有物質をコークス製造過程で原料炭に配合し
て得た含TiO2コークスを使用し，この含TiO2コークスを
前記炉底温度計の指示値が所定値に到達するまで高炉の
中心部に裝入することを特徴とする。[Constitution of the present invention] The present invention, when the indication value of the bottom thermometer embedded in the center of the bottom of the blast furnace rises and damage to the center of the bottom is detected,
In the method of protecting the central portion of the furnace bottom by increasing the amount of TiO 2 source in the blast furnace charging raw material, a TiO 2 containing substance having a particle size of 15 to 3 mm is blended with the raw coal in the coke manufacturing process as the TiO 2 source. The TiO 2 -containing coke thus obtained is used, and the TiO 2 -containing coke is inserted into the center of the blast furnace until the indicated value of the furnace bottom thermometer reaches a predetermined value.
［作用］ 従来法のように焼結鉱にTiO2源を含有させた場合には，
第２図に図解的に示すように，その焼結鉱が溶融した段
階で,TiO2はコークス１と接触して還元されてTiC,TiN等
のチタン化合物６を生成し，これがコークス１に付着す
る。これらの反応は次の（１），（２）式で示される。[Operation] When a TiO 2 source is added to the sintered ore as in the conventional method,
As shown schematically in Fig. 2, when the sinter melts, TiO 2 comes into contact with coke 1 and is reduced to form titanium compounds 6 such as TiC and TiN, which are attached to coke 1. To do. These reactions are represented by the following equations (1) and (2).
TiO2＋3C → TiC＋2CO （１） TiO2＋2C＋1/2N2→TiN＋2CO （２） この時生成するTiC,TiN 6は選択的にコークスに付着す
るために，その分，炉内ガス７が流通しうるコークス層
内の空間が狭くなり，通気性は悪化する。なお，第２図
において,4は溶融スラグを示す。TiO 2 ＋ 3C → TiC ＋ 2CO (1) TiO 2 ＋ 2C ＋ 1 / 2N 2 → TiN ＋ 2CO (2) TiC and TiN 6 generated at this time selectively adhere to the coke, so that the coke gas 7 in the furnace can flow therethrough. The space in the layer is narrowed, and the breathability deteriorates. In FIG. 2, 4 indicates molten slag.
一方，本発明に従ってTiO2含有コークスを高炉に裝入し
た場合には，第１図に図解的に示すように，コークス１
内に存在するTiO2源２は，そのコークス温度が上昇する
に従い，コークス内で（１）式の反応が進行してTiC3が
生成する。ただし，この場合には,TiC3はコークス中に
残留するため，それが特に通気性を悪化させる事はな
い。なお，第１図において,4は溶融スラグを表してい
る。また，本発明に従うTiO2含有コークスを炉中心位置
に裝入した場合には，それがレースウェイ内で燃焼する
ことなく高炉の炉芯部に降下し，最終的には湯溜内の溶
銑５に供給される。されるために，前記反応により生成
したTiC3はコークス１とともに湯溜内まで運ばれる。湯
溜内では，浸炭反応等により消費されるが，その段階で
コースス中のTiCは溶鉄中に放出され，そのTiCは炉中心
の炉底保護を図るチタンベアーの形成に供せられる。On the other hand, when the TiO 2 -containing coke is put into the blast furnace according to the present invention, as shown in FIG.
In the TiO 2 source 2 existing inside, as the coke temperature rises, the reaction of the formula (1) proceeds in the coke to produce TiC3. However, in this case, TiC3 remains in the coke, so it does not particularly deteriorate the air permeability. In Fig. 1, 4 represents molten slag. Further, when the TiO 2 -containing coke according to the present invention is introduced into the furnace center position, it falls into the furnace core of the blast furnace without burning in the raceway, and finally the molten metal 5 in the pool Is supplied to. Therefore, TiC3 produced by the above reaction is carried into the hot water pool together with the coke 1. In the pool, it is consumed by carburizing reaction, etc., but TiC in the course is released into molten iron at that stage, and the TiC is used to form a titanium bear that protects the bottom of the furnace center.
しかし，コークスに添加するTiO2含有物質の粒度が15mm
を超えると，コークス中でのTiO2源の分散が不均一にな
るため，本発明法の効果が現われにくい。他方，粒度が
3mm未満であると含TiO2コークスの強度が低下する。こ
のため,TiO2含有物質の粒度は15〜3mmが適切である。However, the particle size of the TiO 2 -containing substance added to the coke is 15 mm.
If it exceeds, the dispersion of the TiO 2 source in the coke becomes non-uniform, and the effect of the method of the present invention is difficult to appear. On the other hand, the granularity
If it is less than 3 mm, the strength of the TiO 2 -containing coke decreases. Therefore, it is appropriate that the particle size of the TiO 2 -containing substance is 15 to 3 mm.
［実施例］ 内容積2150m3の高炉炉底中心位置に埋設した炉底温度計
の指示値（Ｔ）が上昇し，炉底中心部の損傷を検出し
た。このために，第１表に示す組成のチタンスラグ（３
〜15mm）を10％添加して作ったTiO2含有コークス（粒
度；＋25m）を前記高炉の中心位置に30kg/Tの割合で裝
入を開始した。裝入開始後７日経過した頃より第３図に
示すように指示値（Ｔ）を低下せ始め，更に５日経過し
た時点で所定値（Ｔが上昇し始める前の温度）まで低下
したので含TiO2コークスの裝入を停止した。含TiO2コー
クス装入期間中は，裝入TiO2原単位を0.9kg/T増加させ
たにすぎないが，炉底中心の損傷部を13日間で保護でき
た。しかも通気性指数（ΔP/v）の上昇，すなわ通気性
の悪化は認められなかった。[Example] The indicated value (T) of the bottom thermometer buried in the center of the bottom of the blast furnace with an internal volume of 2150 m 3 was increased, and damage to the center of the bottom was detected. For this purpose, titanium slag (3
TiO 2 -containing coke (particle size: +25 m) made by adding 10% to 15 mm) was introduced into the central position of the blast furnace at a rate of 30 kg / T. As shown in Fig. 3, the indicator value (T) began to decrease from 7 days after the start of insertion, and it decreased to a predetermined value (temperature before T started to increase) after 5 days. The introduction of TiO 2 -containing coke was stopped. During containing TiO 2 coke charging period, but only a裝入TiO 2 basic unit was increased 0.9 kg / T, it could be protected by the damaged portion of the furnace bottom central 13 days. Moreover, no increase in air permeability index (ΔP / v), that is, no deterioration in air permeability was observed.
比較例１ 実施例と同様に，炉底温度計により2150m3の高炉炉底中
心部の損傷を察知した。本例では，従来法と同様に，焼
結鉱中のTiO2濃度を増大せしめて高炉への裝入TiO2原単
位を15kg/Tから20kg/Tに増加した。この間の炉底中心温
度（Ｔ）と通気性指数（ΔP/v）の推移を第４図に示し
た。第４図に見られるように，裝入TiO2原単位を5kg/T
増加させて以降６日で温度（Ｔ）は低下する傾向を示し
たが，前記の実施例に比べ裝入TiO2原単位が高いにもか
かわらず，（Ｔ）が所定値まで低下するには13日を要
し，炉底保護に及ぼす裝入TiO2の効率は悪かった。ま
た，この場合には，通気性の悪化も認められ，高炉の操
業性は悪かった。 Comparative Example 1 Similar to the example, damage of the center of the blast furnace bottom of 2150 m 3 was detected by the bottom thermometer. In this example, as in the case of the conventional method, the TiO 2 concentration in the sinter was increased and the TiO 2 unit consumption into the blast furnace was increased from 15 kg / T to 20 kg / T. Changes in the furnace center temperature (T) and the air permeability index (ΔP / v) during this period are shown in FIG. As can be seen in Fig. 4, the basic unit of TiO 2 is 5 kg / T.
Although the temperature (T) tended to decrease within 6 days after the increase, it was found that (T) decreased to a predetermined value in spite of the higher unit TiO 2 unit density of the insert compared to the above-mentioned examples. It took 13 days, and the efficiency of insert TiO 2 on the bottom protection was poor. Moreover, in this case, deterioration of air permeability was also observed, and the operability of the blast furnace was poor.
［発明の効果］ 本発明によれば，コークス表面にTi化合物が付着して通
気性を悪化させる様なことはなく，高炉を安定に操業し
ながら，炉底中心部を効率良く保護することができる。[Advantages of the Invention] According to the present invention, the Ti compound does not adhere to the surface of the coke to deteriorate the air permeability, and the center of the hearth can be efficiently protected while the blast furnace is operating stably. it can.
第１図は，本発明法の含TiO2コークスを高炉に裝入した
場合のTi化合物の生成状況を説明するための模式図，第
２図は含TiO2焼結鉱を高炉に裝入した場合（従来技術）
のTi化合物の生成状況を説明するための模式図，第３図
と第４図はそれぞれ実施例と比較例における炉底中心温
度と通気性指数の経時変化図である。 １……コークス,2……TiO2源,3……TiC4……溶融スラ
グ,5……溶鉄,6……TiCやTiN等のチタン化合物,7……炉
内ガス。FIG. 1 is a schematic diagram for explaining the production state of Ti compounds when the TiO 2 -containing coke according to the present invention is inserted into the blast furnace, and FIG. 2 is the TiO 2 -containing sintered ore was inserted into the blast furnace. Case (prior art)
FIG. 3 is a schematic diagram for explaining the production state of the Ti compound of FIG. 3, and FIGS. 3 and 4 are time-dependent change diagrams of the furnace bottom center temperature and the air permeability index in Examples and Comparative Examples, respectively. 1 ... Coke, 2 ... TiO 2 source, 3 ... TiC 4 ... Molten slag, 5 ... Molten iron, 6 ... Titanium compounds such as TiC and TiN, 7 ... Furnace gas.
───────────────────────────────────────────────────── フロントページの続き (72)発明者 西本 義明 広島県呉市昭和町11番１号 日新製鋼株式 会社呉研究所内 (72)発明者 大楠 洋 広島県呉市昭和町11番１号 日新製鋼株式 会社呉研究所内 (72)発明者 梶間 尚志 広島県呉市昭和町11番１号 日新製鋼株式 会社呉研究所内 (56)参考文献 特開 昭60−228611（ＪＰ，Ａ) ─────────────────────────────────────────────────── ─── Continued Front Page (72) Inventor Yoshiaki Nishimoto 11-1 Showa-cho, Kure City, Hiroshima Prefecture Nisshin Steel Co., Ltd. Kure Research Institute (72) Inventor Hiroshi Okusu 11-11 Showa-cho, Kure City, Hiroshima Prefecture Inside the Kure Research Center of the New Steel Co., Ltd. (72) Naoshi Kajma 11-11 Showa-cho, Kure City, Hiroshima Prefecture Inside the Kure Research Center of the Nisshin Steel Co., Ltd. (56) References JP-A-60-228611 (JP, A)
Claims (1)
示値が上昇して炉底中心部の損傷が察知せられたさい
に，高炉装入原料中にTiO2源を増量して該炉底中心部を
保護する方法において，該TiO2源として,15〜3mmの粒度
を有するTiO2含有物質をコークス製造過程で原料炭に配
合して得た含TiO2コークスを使用し，この含TiO2コーク
スを前記炉底温度計の指示値が所定値に到達するまで高
炉の中心部に装入することを特徴とする高炉炉底中心部
の保護方法。1. When the indicated value of the bottom thermometer embedded in the center of the bottom of the blast furnace rises and damage to the center of the bottom is detected, the amount of TiO 2 source in the blast furnace charging material is increased. Te method for protecting the furnace bottom central portion, as the TiO 2 source, using a free TiO 2 coke of TiO 2 containing material obtained by compounding the raw coal in the coke production process having a particle size of 15～3Mm, A method for protecting the central part of the bottom of a blast furnace, wherein the TiO 2 -containing coke is charged into the central part of the blast furnace until the indicated value of the furnace bottom thermometer reaches a predetermined value.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2612689A JPH0774367B2 (en) | 1989-02-04 | 1989-02-04 | How to protect the center of the bottom of the blast furnace |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2612689A JPH0774367B2 (en) | 1989-02-04 | 1989-02-04 | How to protect the center of the bottom of the blast furnace |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH02205609A JPH02205609A (en) | 1990-08-15 |
| JPH0774367B2 true JPH0774367B2 (en) | 1995-08-09 |
Family
ID=12184870
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2612689A Expired - Lifetime JPH0774367B2 (en) | 1989-02-04 | 1989-02-04 | How to protect the center of the bottom of the blast furnace |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0774367B2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE19538162C2 (en) * | 1995-10-12 | 1997-09-11 | Metallgesellschaft Ag | Process for lowering the melting point of the residual ash of coal |
| CN113174450B (en) * | 2021-04-15 | 2022-11-18 | 鞍钢股份有限公司 | A method for blast furnace treatment and recovery of waste flue gas denitrification catalyst |
-
1989
- 1989-02-04 JP JP2612689A patent/JPH0774367B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH02205609A (en) | 1990-08-15 |
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