JP2608505B2 - Blast furnace operation method - Google Patents
Blast furnace operation methodInfo
- Publication number
- JP2608505B2 JP2608505B2 JP12933392A JP12933392A JP2608505B2 JP 2608505 B2 JP2608505 B2 JP 2608505B2 JP 12933392 A JP12933392 A JP 12933392A JP 12933392 A JP12933392 A JP 12933392A JP 2608505 B2 JP2608505 B2 JP 2608505B2
- Authority
- JP
- Japan
- Prior art keywords
- furnace
- core
- iron
- furnace core
- coke
- 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 - Fee Related
Links
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
Landscapes
- Manufacture Of Iron (AREA)
Description
【０００１】[0001]
【産業上の利用分野】本発明は高炉の炉芯部の粉率を低
下させる高炉の操業方法に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for operating a blast furnace, which reduces the powder ratio of the core of the blast furnace.
【０００２】[0002]
【従来の技術】高炉においては鉄原料とコークスとを交
互に炉頂部より装入し、羽口より高炉に空気を吹き込ん
でコークスを燃焼させる。コークスの燃焼によって発生
する還元ガス、さらには空気と共に羽口より吹き込んだ
微粉炭等の燃焼による還元ガスによって鉄原料を還元す
る。炉頂より装入されたコークスはシャフト部の間接還
元帯ではガスとの反応もなく降下するが、直接還元帯に
入るとソリューションロス反応によりＣＯ2 と反応する
ため特に表層部の組織が脆弱化する。そのため炉下部に
降下してきたコークスは炉芯表層部および炉壁近傍で粉
化する可能性がある。また粉化をまぬがれたコークスも
レースウェイへ降下すると、羽口より吹き込まれた空気
と燃焼しつつレースウェイ内でのコークスの旋回運動に
より粉化する可能性が大きい。また最近のような微粉炭
多量吹込み操業では、レースウェイ内での未燃チャー発
生量やコークス粉化量の増大が予想される。2. Description of the Related Art In a blast furnace, iron raw materials and coke are charged alternately from the furnace top, and air is blown into the blast furnace from tuyeres to burn the coke. The iron raw material is reduced by a reducing gas generated by the combustion of coke, and further by a reducing gas generated by burning pulverized coal and the like blown from the tuyere together with air. Coke charged from the furnace top drops without reacting with gas in the indirect reduction zone of the shaft, but when entering the direct reduction zone, it reacts with CO 2 by solution loss reaction, especially weakening the surface layer structure I do. Therefore, the coke that has fallen to the lower part of the furnace may be powdered in the surface portion of the furnace core and near the furnace wall. Also, when the coke that has not been pulverized descends to the raceway, there is a high possibility that the coke is swirled in the raceway while burning with the air blown from the tuyeres. In addition, in a recent operation of injecting a large amount of pulverized coal, it is expected that the amount of unburned char and the amount of coke powdered in the raceway will increase.
【０００３】このように、炉内で増加した粉コークスは
炉芯表層部や炉芯内部および炉壁近傍に堆積しやすい。
特に炉芯に粉コークスが堆積し炉芯内の粉率が増大した
場合には、炉芯の通気性・通液性が低下し、対策を講じ
ないと炉芯部が冷え込むことになる。[0003] As described above, the coke breeze increased in the furnace tends to deposit on the surface layer of the furnace core, inside the furnace core, and near the furnace wall.
In particular, when coke breeze accumulates in the furnace core and the powder ratio in the furnace core increases, the air permeability and liquid permeability of the furnace core decrease, and if no measures are taken, the furnace core will cool down.
【０００４】炉芯部の通気性・通液性を確保する手段と
して、いわゆるクリーニング操業と称し、高炉の燃料比
を上昇させる方法がある。しかしこの場合、投入された
エネルギーの大部分が炉頂ガス顕熱上昇、炉体熱負荷増
大、溶銑やスラグの顕熱上昇として炉外に排出され、炉
芯加熱に寄与するのはわずかのため、エネルギーの効率
が悪い。また特開平１−６５２０７号には炉芯部に通気
性にすぐれた良質のコークスを特定量装入することによ
り炉芯部の通気性を向上させる技術が開示されている。
この技術は炉内に発生する粉を炉芯に堆積させない技術
であり、基本的には炉内で発生した粉は消滅せず炉内の
どこかの場所に堆積することになる。また良質のコーク
スが必要なため、コスト的に問題が生じる可能性があ
る。[0004] As means for ensuring the air permeability and liquid permeability of the furnace core, there is a method called so-called cleaning operation, which raises the fuel ratio of the blast furnace. However, in this case, most of the input energy is discharged outside the furnace as a rise in the sensible heat of the top gas, an increase in the heat load of the furnace body, and an increase in the sensible heat of the hot metal and slag, and it contributes little to the heating of the core. Inefficient, energy efficient. Japanese Patent Application Laid-Open No. 1-65207 discloses a technique for improving the air permeability of a furnace core by charging a specific amount of high-quality coke having excellent air permeability into the furnace core.
This technique is a technique in which powder generated in a furnace is not deposited on a furnace core, and basically, powder generated in the furnace does not disappear and is deposited somewhere in the furnace. Further, since high-quality coke is required, there may be a problem in cost.
【０００５】[0005]
【発明が解決しようとする課題】本発明は炉芯部に堆積
した粉コークスや未燃チャーを減少させて、炉芯部の通
気性・通液性を急速かつ効率的に回復させることを課題
とする。SUMMARY OF THE INVENTION An object of the present invention is to reduce the amount of coke breeze and unburned char deposited on a furnace core, and to quickly and efficiently restore the gas permeability and liquid permeability of the furnace core. And
【０００６】[0006]
【課題を解決するための手段】本発明は上記課題を解決
するものであって、高炉操業において、炉芯部に炭素未
飽和の鉄の液滴を滴下させ、該液滴に炉芯内の粉コーク
ス、未燃チャーを浸炭させ、炉芯内に堆積した粉コーク
ス、未燃チャー量を減少させることを特徴とする高炉操
業方法である。ここにおいて、炭素未飽和の鉄の液滴は
炉頂中心部に装入したスクラップあるいは粒鉄の鉄原料
が溶融滴下したものであることも特徴とする。SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems. In operation of a blast furnace, iron droplets of carbon-unsaturated iron are dropped on a core of the furnace, and the droplets are dropped on the core. Powdered coke
Powder and coke accumulated in the furnace core after carburizing unburned char
Scan, a blast furnace operation wherein the Rukoto reduces unburned char weight. Here, also characterized in that the droplets of iron carbon unsaturated are those scraps or granulated metallic iron iron raw material charged into the furnace top center was added dropwise melted.
【０００７】[0007]
【作用】図２は高炉の休風時の羽口コークスサンプリン
グおよび操業時のガス圧力測定値より、炉芯内の粉率と
炉下部の通気抵抗係数（Ｋ値）を求めた結果と炉芯温度
の関係を整理したものである。これによると炉芯内の粉
率の増加にともない炉下部の通気抵抗係数が増加してい
るが、これは炉芯内の粉が炉芯内の空隙を閉塞したり小
さくするためである。その結果、炉芯内へ流通する高温
の還元ガス量が減少し炉芯温度が低下する。このためス
リップの多発等炉況が不安定になり出銑量も低下してく
る。FIG. 2 shows the results of determining the powder ratio in the furnace core and the ventilation resistance coefficient (K value) in the lower part of the furnace from the tuyere coke sampling when the blast furnace is shut off and the gas pressure measured during operation. It is a summary of the relationship between temperatures. According to this, the ventilation resistance coefficient in the lower part of the furnace increases with an increase in the powder ratio in the furnace core, because the powder in the furnace core blocks or reduces the voids in the furnace core. As a result, the amount of high-temperature reducing gas flowing through the core decreases, and the core temperature decreases. For this reason, the furnace condition such as the occurrence of slips becomes unstable, and the tapping rate also decreases.
【０００８】この対策として、本発明において炉芯部に
特定量の炭素未飽和の鉄の液滴を滴下させ、鉄の液滴に
炉芯内の粉コークスを侵炭させることにより、炉芯内の
粉率を低下させることができる。この場合の炭素未飽和
の鉄原料としては、粒鉄でもよい。[0008] As a countermeasure, in the present invention, a specific amount of carbon-unsaturated iron droplets is dropped on the core of the furnace and the iron droplets are carburized with coke powder in the core, thereby reducing the amount of iron in the core. Powder ratio can be reduced. As the carbon-unsaturated iron raw material in this case, granular iron may be used.
【０００９】また、炉芯温度を操業中に測定する必要が
あるが、羽口からあるいは炉下部側壁より水冷構造のプ
ローブを炉芯部に挿入して、グラスファイバーに連結し
た光高温計により測定する方法が知られている。その他
間接的方法にはなるが炉下部に配置した冷却装置である
ステーブの温度を指標として推定する方法もある。Although it is necessary to measure the furnace core temperature during operation, a water-cooled probe is inserted into the furnace core from the tuyere or from the lower side wall of the furnace, and is measured by an optical pyrometer connected to glass fiber. There are known ways to do this. Although there is another indirect method, there is also a method of estimating the temperature of a stave, which is a cooling device arranged in the lower part of the furnace, as an index.
【００１０】炉芯部に特定量の炭素未飽和の鉄の液滴を
滴下させる方法としては、炉頂の装入装置により中心部
にスクラップ等の鉄原料を装入する。図１はこの状況を
示す高炉１の一部分の断面図である。近年の炉頂装入装
置２を含む装入制御系統の改良・進歩により、スクラッ
プ等の鉄原料を容易に炉頂中心部３に装入することがで
きる。炉芯部４のほぼ全体に炭素未飽和の鉄の液滴を滴
下させるためには、炉頂でのスクラップ等の鉄原料の装
入範囲は中心から炉口径の２０％の範囲以下で十分であ
り、１０％の範囲でも炉芯内の粉率を低下させる効果は
大きい。As a method of dropping a specific amount of carbon-unsaturated iron droplets into the furnace core, iron material such as scrap is charged into the center by a charging device at the furnace top. FIG. 1 is a sectional view of a part of the blast furnace 1 showing this situation. With the improvement and progress of the charging control system including the furnace top charging device 2 in recent years, iron materials such as scrap can be easily charged into the center 3 of the furnace top. In order to allow carbon-unsaturated iron droplets to be dripped almost all over the furnace core 4, the charging range of iron material such as scrap at the furnace top should be less than 20% of the furnace diameter from the center. Also, even in the range of 10%, the effect of lowering the powder rate in the furnace core is great.
【００１１】[0011]
【実施例】内容積４４００立方メートルの高炉において
本発明の炉芯内粉率低下方法を実施した。図３は炉芯内
の粉率とスリップ回数の推移を示すグラフであるが、従
来の高炉操業では炉芯内の粉率の増減にともないスリッ
プ回数も増減していたが、本発明法のスクラップ等鉄原
料の炉頂での中心装入により、炉芯内の粉率とその変動
を減少させ、スリップ回数を減少させることができた。
その結果、炉況安定化効果およびスクラップ等の鉄原料
の装入効果により出銑量を増加することができた。EXAMPLE In a blast furnace having an inner volume of 4400 cubic meters, the method for reducing the in-core powder ratio of the present invention was carried out. FIG. 3 is a graph showing the transition of the powder ratio in the furnace core and the number of slips. In the conventional blast furnace operation, the number of slips also increased and decreased according to the increase and decrease of the powder ratio in the furnace core. By charging the iron core material at the center of the furnace top, the powder ratio in the furnace core and its fluctuation were reduced, and the number of slips could be reduced.
As a result, the tapping rate could be increased due to the effect of stabilizing the furnace condition and the effect of charging iron raw materials such as scrap.
【００１２】[0012]
【発明の効果】本発明は炉芯部の粉率の増加による通気
性・通液性の低下やスリップの増大による炉況の不安定
化を、炉頂中心部からスクラップ等の鉄原料を装入する
ことにより解決する。本発明方法は休風時のみならず操
業中にも行えるものであり、定常的かつ効率的に炉芯部
の通気性・通液性を改善することができ、その結果、高
炉の安定操業を維持できる。According to the present invention, the reduction of air permeability and liquid permeability due to an increase in the powder ratio of the furnace core and the instability of the furnace condition due to an increase in slip can be achieved by mounting an iron raw material such as scrap from the center of the furnace top. To solve the problem. The method of the present invention can be performed not only at the time of outage but also during the operation, and the air permeability and the liquid permeability of the furnace core can be constantly and efficiently improved, and as a result, the stable operation of the blast furnace can be achieved. Can be maintained.
【図１】本発明の炉頂中心部へのスクラップ等鉄原料の
装入方法を説明する高炉の一部分の断面図FIG. 1 is a cross-sectional view of a part of a blast furnace for explaining a method of charging a raw material such as scrap into the center of a furnace according to the present invention.
【図２】炉芯内の粉率と炉下部の通気抵抗係数（Ｋ値）
および炉芯内の粉率と炉芯温度の関係を示すグラフFig. 2 Powder fraction in the furnace core and ventilation resistance coefficient (K value) in the lower part of the furnace
Graph showing the relationship between the powder fraction in the furnace core and the furnace core temperature
【図３】炉芯内の粉率とスリップ回数の推移を示すグラ
フFIG. 3 is a graph showing changes in the powder ratio in the furnace core and the number of slips.
───────────────────────────────────────────────────── フロントページの続き (72)発明者 飯田 孝司 福岡県北九州市戸畑区飛幡町１番１号 新日本製鐵株式会社 八幡製鐵所内 (72)発明者 小玉 一郎 福岡県北九州市戸畑区飛幡町１番１号 新日本製鐵株式会社 八幡製鐵所内 (56)参考文献 特開 平５−148519（ＪＰ，Ａ) ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Takashi Iida 1-1, Tobata-cho, Tobata-ku, Kitakyushu-shi, Fukuoka Nippon Steel Corporation Inside Yawata Works (72) Inventor Ichiro Kodama Tobata-ku, Tobata-ku, Kitakyushu-shi, Fukuoka No. 1-1, Nippon Steel Corporation Yawata Works (56) References JP-A-5-148519 (JP, A)
Claims (2)
せ、該液滴に炉芯内の粉コークス、未燃チャーを浸炭さ
せ、炉芯内に堆積した粉コークス、未燃チャー量を減少
させることを特徴とする高炉操業方法。1. Drops of carbon-unsaturated iron are dropped on a furnace core, and the coke powder and unburned char in the furnace core are carburized with the droplets.
To reduce the amount of coke breeze and unburned char accumulated in the furnace core
Blast furnace operation wherein the Rukoto is.
装入することにより、炉芯部に炭素未飽和の鉄の液滴を
滴下させることを特徴とする請求項１記載の高炉操業方
法。2. A blast furnace operating method according to claim 1 , wherein scrap or granular iron is charged into the center of the furnace top to drop carbon-unsaturated iron droplets on the furnace core.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12933392A JP2608505B2 (en) | 1992-04-23 | 1992-04-23 | Blast furnace operation method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12933392A JP2608505B2 (en) | 1992-04-23 | 1992-04-23 | Blast furnace operation method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH05295410A JPH05295410A (en) | 1993-11-09 |
| JP2608505B2 true JP2608505B2 (en) | 1997-05-07 |
Family
ID=15007014
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP12933392A Expired - Fee Related JP2608505B2 (en) | 1992-04-23 | 1992-04-23 | Blast furnace operation method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2608505B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008057005A (en) * | 2006-08-31 | 2008-03-13 | Jfe Steel Kk | Method for operating blast furnace |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5862519B2 (en) * | 2012-08-31 | 2016-02-16 | 新日鐵住金株式会社 | Blast furnace operation method |
| CN110129499B (en) * | 2019-05-21 | 2020-10-13 | 德龙钢铁有限公司 | Method for producing molten iron by adding scrap steel into blast furnace |
| CN111304385A (en) * | 2020-03-09 | 2020-06-19 | 中冶南方工程技术有限公司 | Blast furnace-converter production system based on hot metal ladle straddle carrier and operation method thereof |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH05148519A (en) * | 1991-11-21 | 1993-06-15 | Nisshin Steel Co Ltd | Method for detecting activating condition in furnace core in blast furnace operation |
-
1992
- 1992-04-23 JP JP12933392A patent/JP2608505B2/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008057005A (en) * | 2006-08-31 | 2008-03-13 | Jfe Steel Kk | Method for operating blast furnace |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH05295410A (en) | 1993-11-09 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| Matsui et al. | Reduction behavior of carbon composite iron ore hot briquette in shaft furnace and scope on blast furnace performance reinforcement | |
| US8690987B2 (en) | Method and apparatus for producing carbon iron composite | |
| JP2608505B2 (en) | Blast furnace operation method | |
| KR100241854B1 (en) | How to operate vertically | |
| Kurunov et al. | Analysis of the behavior of alkalis in a blast furnace | |
| JP4585075B2 (en) | Blast furnace operation method using metallic iron-based raw materials | |
| JP3171066B2 (en) | Blast furnace operation method | |
| JP2983087B2 (en) | Operation method of smelting reduction | |
| JP4328001B2 (en) | Blast furnace operation method | |
| JP2921392B2 (en) | Blast furnace operation method | |
| JP3102626B2 (en) | Blast furnace operation method | |
| JPWO2003062473A1 (en) | Manufacturing method of low silicon hot metal | |
| Tijhuis et al. | BF cooling and refractory technology | |
| JPH06271906A (en) | Method for charging briquetted coke into blast furnace | |
| JPH11117010A (en) | Operation of vertical type furnace | |
| JP2541200B2 (en) | Converter for preventing melting of furnace wall due to high temperature gas | |
| JP3121894B2 (en) | Metal melting furnace | |
| JPH09227911A (en) | Operation of blast furnace | |
| JP3226652B2 (en) | Blast furnace operation method | |
| Ostrowski et al. | Blast Furnace Enrichment Investigations | |
| JP2921374B2 (en) | Blast furnace operation method | |
| JPH11158519A (en) | Operation of vertical furnace | |
| Babarykin et al. | Causes of the Variation in Blast Furnace Shaft Life at the Magnitogorsk Iron and Steel Combine | |
| JPH0913109A (en) | Operation of blowing large quantity of pulverized fine coal into blast furnace | |
| JPH05239515A (en) | Method for operating blast furnace |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A01 | Written decision to grant a patent or to grant a registration (utility model) |
Free format text: JAPANESE INTERMEDIATE CODE: A01 Effective date: 19961112 |
|
| LAPS | Cancellation because of no payment of annual fees |