JPH04329810A - Blowing out method of blast furnace - Google Patents
Blowing out method of blast furnaceInfo
- Publication number
- JPH04329810A JPH04329810A JP10100691A JP10100691A JPH04329810A JP H04329810 A JPH04329810 A JP H04329810A JP 10100691 A JP10100691 A JP 10100691A JP 10100691 A JP10100691 A JP 10100691A JP H04329810 A JPH04329810 A JP H04329810A
- Authority
- JP
- Japan
- Prior art keywords
- furnace
- blast furnace
- blasting
- air
- blowing
- 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.)
- Pending
Links
- 238000007664 blowing Methods 0.000 title claims abstract description 19
- 238000000034 method Methods 0.000 title claims abstract description 13
- 239000000498 cooling water Substances 0.000 claims abstract description 13
- 238000001816 cooling Methods 0.000 abstract description 8
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 7
- 238000004880 explosion Methods 0.000 abstract description 5
- 239000011819 refractory material Substances 0.000 abstract description 4
- 150000002500 ions Chemical class 0.000 abstract description 2
- 238000005422 blasting Methods 0.000 abstract 3
- 239000002801 charged material Substances 0.000 abstract 1
- 238000007789 sealing Methods 0.000 abstract 1
- 238000005507 spraying Methods 0.000 abstract 1
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 4
- 239000000571 coke Substances 0.000 description 3
- 238000010276 construction Methods 0.000 description 3
- 230000007423 decrease Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000007599 discharging Methods 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000011017 operating method Methods 0.000 description 1
- 238000010079 rubber tapping Methods 0.000 description 1
- 238000004904 shortening Methods 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
- 239000002351 wastewater Substances 0.000 description 1
Landscapes
- Blast Furnaces (AREA)
Abstract
Description
【０００１】0001
【産業上の利用分野】この発明は、高炉の操業方法、特
に吹卸し休風に入る前後の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 of operating a blast furnace, and more particularly, to a method of operating a blast furnace before and after entering a blow-off period.
【０００２】0002
【従来の技術】従来は、高炉の吹卸し休風に入る方法と
して、吹卸し後の炉内装入物排出工事期間の短縮と、工
事費用の削減を目的として、炉内装入物を羽口レベルま
で減尺する。この場合羽口から送風しコークスを燃焼さ
せ、鉱石を還元し、生成した溶銑、溶滓を出銑口より排
出することにより炉内装入物を減少させ、装入物表面を
羽口レベルまで降下させる。[Prior Art] Conventionally, as a method of blowing down and entering the blast furnace, the contents in the furnace were removed to the tuyere level with the aim of shortening the construction period for discharging the contents in the furnace after blowdown and reducing construction costs. Reduce the scale to . In this case, air is blown from the tuyere to burn the coke, reduce the ore, and discharge the generated hot metal and slag from the taphole to reduce the amount of charge in the furnace and lower the surface of the charge to the tuyere level. let
【０００３】この場合、装入物のレベルが降下すると共
に、炉内装入物はコークスが主体となり、その燃焼によ
り、発生する高炉ガスの温度が上昇する。このためガス
爆発のおそれや設備の熱疲労等の問題が生じる。これら
の問題に対処するため、従来は炉頂より撒水することに
より炉頂ガスの温度を低下させていた。[0003] In this case, as the level of the charge decreases, the charge in the furnace is mainly composed of coke, and its combustion causes the temperature of the generated blast furnace gas to rise. This causes problems such as the risk of gas explosion and thermal fatigue of equipment. In order to deal with these problems, conventionally the temperature of the furnace top gas has been lowered by sprinkling water from the furnace top.
【０００４】更にこの際、未溶融鉱石の残留が吹卸し後
の炉内装入物排出作業を困難なものにし、炉内装入物排
出工事期間を長くし、工事費用を増加させるので、未溶
融鉱石の残留を無くする提案が特開平１−１９８４１１
号公報に記載されている。Furthermore, at this time, residual unmelted ore makes it difficult to discharge the contents from the furnace after blowing down, prolongs the period of work for discharging the contents from the furnace, and increases construction costs. A proposal to eliminate the residual of
It is stated in the No.
【０００５】[0005]
【発明が解決しようとする課題】然し、上述した従来の
方法によると、莫大な費用がかかり、その作業に爆発等
の危険が伴う。本発明は係る事情に鑑みなされたもので
高炉吹卸しに伴う費用を低減し、且つその作業に伴う爆
発等の危険を回避する事を目的とする。However, the above-mentioned conventional method requires a huge amount of cost and involves the risk of explosion or the like. The present invention has been made in view of the above circumstances, and aims to reduce the cost associated with blast furnace blowdown and to avoid risks such as explosions associated with the work.
【０００６】上記の他に次の背景がある。即ちわが国に
おいて１９７７年頃以降は各社共に経営環境の変化によ
り製銑能力に余剰を生じたので、この製銑能力の余剰を
有効に活用する技術の確立が強く要望されている。本発
明はかかる事情に鑑みてなされたもので、製銑能力の余
剰を活用した高炉吹卸し費用を低減する方法を提供する
事を目的とする。In addition to the above, there is the following background. In other words, since around 1977 in Japan, all companies have had surplus ironmaking capacity due to changes in the business environment, and there is a strong desire to establish a technology to effectively utilize this surplus ironmaking capacity. The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a method of reducing blast furnace blowing costs by utilizing surplus ironmaking capacity.
【０００７】[0007]
【課題を解決するための手段】この発明に係る高炉吹卸
し方法は、装入物のレベルを定常操業状態に維持しなが
ら送風を停止し、ついで炉頂マンホールを開き、ついで
炉頂部に点火する、ついで羽口及び出銑口をシールして
空気を閉塞する、同時にこれらの作業の間もこれらの作
業の後も高炉の各部の冷却水は定常操業状態の通水量を
維持することを特徴とする。[Means for Solving the Problems] A method for blowing down a blast furnace according to the present invention is to stop blowing air while maintaining the level of the charge at a steady operating state, then open the furnace top manhole, and then ignite the furnace top. Then, the tuyere and taphole are sealed to block the air, and at the same time, during and after these operations, the amount of cooling water flowing through each part of the blast furnace is maintained at a steady operating state. do.
【０００８】[0008]
【作用】この発明に係る高炉吹卸し方法は、送風の停止
後高炉を密封状態にして徐冷することにより、炉頂が高
温になることがないので、炉内装入物を減尺すること無
く、且つ炉頂より撒水することも無く常温まで冷却でき
る。[Function] The method for blowing down a blast furnace according to the present invention prevents the top of the furnace from reaching a high temperature by slowly cooling the blast furnace in a sealed state after the blowing of air is stopped, so there is no need to reduce the size of the contents in the furnace. , and can be cooled to room temperature without sprinkling water from the top of the furnace.
【０００９】[0009]
【実施例】本発明の高炉の操業方法は、高炉の炉内残留
物を残したまま休風−吹卸しを行うものである。[Embodiment] The method of operating a blast furnace of the present invention is to carry out air suspension and blowdown while leaving the residue inside the blast furnace.
【００１０】本発明の１実施例の高炉の操業法は、内容
積４０００ｍ３ の通常の製銑用の高炉において行われ
た。該高炉の湯溜り部の直径は１０ｍである。図１は本
高炉のプロフィルを示す説明図である。本図によって本
発明の操業法について詳細に説明する。装入物を減尺す
る事なく送風を停止する。送風停止後炉頂マンホール７
を開く。その後炉頂部４に点火する。その後羽口５及び
出銑口６をシールして空気の吸い込みを防止する。これ
らの作業の間もこれらの作業の後も高炉の各部の冷却水
は定常操業状態の通水量を維持する。これらの冷却水総
計は２０００ｔｏｎ／ｈｒである。高炉の各部の冷却水
とは、即ちクーリングスチーブ１の冷却水、下部冷却函
２の冷却水、上部冷却函３の冷却水、羽口５の冷却水、
及び炉底蛇管の冷却水等からなっている。A method of operating a blast furnace according to one embodiment of the present invention was carried out in a conventional blast furnace for iron making having an internal volume of 4000 m3. The diameter of the sump of the blast furnace is 10 m. FIG. 1 is an explanatory diagram showing the profile of the present blast furnace. The operating method of the present invention will be explained in detail with reference to this figure. To stop blowing air without reducing the size of the charge. Furnace top manhole 7 after stopping air blowing
open. Thereafter, the furnace top 4 is ignited. Thereafter, the tuyere 5 and the tap hole 6 are sealed to prevent air from being sucked in. During and after these operations, the amount of cooling water flowing through each part of the blast furnace is maintained at a constant flow rate. The total amount of these cooling waters is 2000 tons/hr. The cooling water for each part of the blast furnace is, namely, the cooling water for the cooling stave 1, the cooling water for the lower cooling box 2, the cooling water for the upper cooling box 3, the cooling water for the tuyere 5,
It also consists of cooling water for the furnace bottom spiral pipe, etc.
【００１１】炉底及び炉壁の耐火物の内部の温度は定常
操業状態で約１５０℃である。送風停止後炉底及び炉壁
の耐火物の内部の温度は徐々に低下してゆく。本発明の
特徴として送風停止後は高炉の炉内の発熱反応が一切停
止するので、炉底及び炉壁の耐火物の内部の温度は上昇
することはなかった。約４０日後約１００℃を下廻る。
さらに送風停止後約６０日後約５０℃を下廻る。また炉
頂部の金物の温度は定常操業状態において約２００℃で
あるが、送風停止後すぐに冷却し始めて炉頂撒水を行う
必要もなかった。本発明が実施されたのは１９９０年７
月から１１月に到る期間であった。この期間においては
製銑能力の余剰が大きく存在していた。[0011] The temperature inside the refractories of the furnace bottom and furnace walls is approximately 150° C. under steady operating conditions. After the blowing of air is stopped, the temperature inside the refractories at the bottom of the furnace and the walls of the furnace gradually decreases. A feature of the present invention is that after the blowing of air is stopped, all exothermic reactions within the blast furnace are stopped, so the temperature inside the refractories of the furnace bottom and furnace walls did not rise. After about 40 days, the temperature drops below about 100℃. Furthermore, about 60 days after the air blowing stopped, the temperature dropped below about 50°C. Furthermore, although the temperature of the metal fittings at the top of the furnace is approximately 200° C. under steady operating conditions, there was no need to start cooling immediately after the blowing of air was stopped and to sprinkle water on the top of the furnace. This invention was carried out in July 1990.
The period lasted from March to November. During this period, there was a large surplus of ironmaking capacity.
【００１２】冷却水は定常操業状態の通水量を維持しな
いと鉄皮が破損し、亀裂を生じ、亀裂箇所から空気を吸
い込んでコークスが燃焼することが、予想される。[0012] If the flow rate of cooling water is not maintained at a steady operating state, it is expected that the steel shell will be damaged, cracks will occur, and the coke will be combusted by sucking air through the cracks.
【００１３】鉄皮が常温に達したら冷却水を停止して炉
内の解体作業に入る。上記の通り本発明によると炉頂撒
水を行わない事により撒水設備が不要であり、且つＣＮ
− イオンを含んだ排水を処理するのに要した莫大な費
用が不要となった。更に羽口まで減尺することが無いの
で爆発の危険性が大幅に減少した。[0013] When the iron shell reaches room temperature, the cooling water is stopped and the dismantling of the inside of the furnace begins. As mentioned above, according to the present invention, water sprinkling equipment is not required because water is not sprinkled at the top of the furnace, and CN
- Eliminates the huge expense required to treat wastewater containing ions. Furthermore, since the tuyeres are not reduced in size, the risk of explosion is greatly reduced.
【００１４】[0014]
【発明の効果】本発明の方法によって高炉の吹卸しを行
うと、作業に伴う危険を回避する事ができる。又製銑能
力の余剰を活用して高炉吹卸し費用を低減する事ができ
る。[Effects of the Invention] By blowing down a blast furnace using the method of the present invention, dangers associated with the work can be avoided. Furthermore, by utilizing the surplus ironmaking capacity, it is possible to reduce the cost of blowing down the blast furnace.
【図１】本発明を実施した高炉のプロフィルを示す説明
図である。FIG. 1 is an explanatory diagram showing the profile of a blast furnace in which the present invention is implemented.
１ クーリングスチーブ ２ 下部冷却函 ３ 上部冷却函 ４ 炉頂部 ５ 羽口 ６ 出銑口 ７ 炉頂マンホール 1 Cooling Steve 2 Lower cooling box 3 Upper cooling box 4 Furnace top 5 Tuyere 6 Tapping hole 7 Furnace top manhole
Claims (1)
しながら送風を停止し、ついで炉頂マンホールを開き、
ついで炉頂部に点火する、ついで羽口及び出銑口をシー
ルして空気を閉塞する、同時にこれらの作業の間もこれ
らの作業の後も高炉の各部の冷却水は定常操業状態の通
水量を維持することを特徴とする高炉吹卸し方法。[Claim 1] Stop blowing air while maintaining the charge level at a steady operating state, then open the furnace top manhole,
Next, the top of the furnace is ignited, and the tuyeres and tapholes are sealed to block the air. At the same time, during and after these operations, the cooling water in each part of the blast furnace is maintained at the same flow rate as in the steady operating state. A method for blowing down a blast furnace characterized by maintaining
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10100691A JPH04329810A (en) | 1991-05-02 | 1991-05-02 | Blowing out method of blast furnace |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10100691A JPH04329810A (en) | 1991-05-02 | 1991-05-02 | Blowing out method of blast furnace |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH04329810A true JPH04329810A (en) | 1992-11-18 |
Family
ID=14289166
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP10100691A Pending JPH04329810A (en) | 1991-05-02 | 1991-05-02 | Blowing out method of blast furnace |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH04329810A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP3839074A1 (en) * | 2019-12-20 | 2021-06-23 | Danieli Corus BV | Blast furnace plant and shutdown process |
| CN114317857A (en) * | 2021-12-30 | 2022-04-12 | 鞍钢集团工程技术有限公司 | Blast furnace chute gate with ignition hole and ignition method |
-
1991
- 1991-05-02 JP JP10100691A patent/JPH04329810A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP3839074A1 (en) * | 2019-12-20 | 2021-06-23 | Danieli Corus BV | Blast furnace plant and shutdown process |
| WO2021121701A1 (en) * | 2019-12-20 | 2021-06-24 | Danieli Corus B.V. | Blast furnace plant and shutdown process |
| CN114317857A (en) * | 2021-12-30 | 2022-04-12 | 鞍钢集团工程技术有限公司 | Blast furnace chute gate with ignition hole and ignition method |
| CN114317857B (en) * | 2021-12-30 | 2022-12-20 | 鞍钢集团工程技术有限公司 | Blast furnace chute gate with ignition hole and ignition method |
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