JPH03274208A - Method for controlling cooling of furnace bottom in blast furnace - Google Patents
Method for controlling cooling of furnace bottom in blast furnaceInfo
- Publication number
- JPH03274208A JPH03274208A JP7393290A JP7393290A JPH03274208A JP H03274208 A JPH03274208 A JP H03274208A JP 7393290 A JP7393290 A JP 7393290A JP 7393290 A JP7393290 A JP 7393290A JP H03274208 A JPH03274208 A JP H03274208A
- Authority
- JP
- Japan
- Prior art keywords
- furnace
- cooling
- side wall
- cooling water
- blast furnace
- 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
- 238000001816 cooling Methods 0.000 title claims abstract description 44
- 238000000034 method Methods 0.000 title claims abstract description 13
- 239000000498 cooling water Substances 0.000 claims abstract description 32
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 32
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 abstract description 16
- 239000002893 slag Substances 0.000 abstract description 11
- 238000004519 manufacturing process Methods 0.000 abstract description 10
- 229910052742 iron Inorganic materials 0.000 abstract description 8
- 238000005507 spraying Methods 0.000 abstract 2
- 239000011449 brick Substances 0.000 description 11
- 239000002184 metal Substances 0.000 description 7
- 229910052751 metal Inorganic materials 0.000 description 7
- 238000010586 diagram Methods 0.000 description 6
- 230000000694 effects Effects 0.000 description 6
- 238000002844 melting Methods 0.000 description 4
- 230000008018 melting Effects 0.000 description 4
- 230000007423 decrease Effects 0.000 description 3
- 230000009467 reduction Effects 0.000 description 3
- 239000000725 suspension Substances 0.000 description 2
- 229910000805 Pig iron Inorganic materials 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 239000012809 cooling fluid Substances 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000008092 positive effect Effects 0.000 description 1
- 239000011819 refractory material Substances 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 238000010079 rubber tapping Methods 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
Landscapes
- Blast Furnaces (AREA)
Abstract
Description
【発明の詳細な説明】
産業上の利用分野
この発明は高炉の炉底に蓄えられた溶銑滓の温度が炉底
の冷却により低下し、さらには凝固することにより出銑
滓が不調となるのを防ぎ、高炉の安定操業を確保するた
めの炉底冷却制御方法に関する。[Detailed Description of the Invention] Industrial Application Field This invention is aimed at reducing the temperature of hot metal slag stored at the bottom of a blast furnace due to cooling of the bottom of the furnace, and further solidifying, which causes the tap iron slag to deteriorate. This invention relates to a furnace bottom cooling control method for preventing blast furnace operation and ensuring stable operation of a blast furnace.
従来の技術
高炉炉底部の冷却手段としては、例えば第4図に示すご
とく、炉底(1)の底盤下に冷却流体の供給並びに排出
部を備えた複数の冷却バイブ(2)を埋設し、この冷却
バイブにより炉底下面を冷却する方法、炉底側壁部に散
水管(4)を配管し、側壁鉄皮(3)を散水管(4)に
て水冷する方法(実公昭59−35559号公報参照、
特公昭59−33162号公報参照)等が知られている
。BACKGROUND ART As a cooling means for the bottom of a blast furnace, for example, as shown in FIG. 4, a plurality of cooling vibes (2) each having a cooling fluid supply and discharge section are buried under the bottom plate of a furnace bottom (1). A method of cooling the lower surface of the furnace bottom with this cooling vibrator, a method of piping a water sprinkling pipe (4) to the side wall of the furnace bottom, and cooling the side wall iron skin (3) with water using the water sprinkling pipe (4) (Utility Model Publication No. 59-35559) See official bulletin,
(see Japanese Patent Publication No. 59-33162), etc. are known.
ところで、このような炉底冷却設備を備えた高炉におい
て、減産または休風等で炉内で生成する鉱滓の量が減少
または停止すると、必然的に炉底への入熱が減少する。By the way, in a blast furnace equipped with such bottom cooling equipment, when the amount of slag generated in the furnace decreases or stops due to production reduction or wind suspension, the heat input to the furnace bottom inevitably decreases.
一方、最近の高炉は炉底に高熱伝導性の耐火煉瓦を使用
しているため、以前と同じ水冷容量のままでは冷却効果
が過大となり、炉底に蓄えられている溶銑滓の温度が低
下し、凝固する現象が発生する。On the other hand, recent blast furnaces use firebricks with high thermal conductivity in the bottom of the furnace, so if the water cooling capacity remains the same as before, the cooling effect will be excessive and the temperature of the hot metal slag stored in the bottom of the furnace will drop. , a phenomenon of solidification occurs.
そのため、従来は第4図に示す冷却バイブ(2)への冷
却水の供給停止、温水化または蒸気に変更する等の方法
、または一部の冷却管の通水停止、各冷却管に流す冷却
水量の減少等の方法をこうじて冷却能を制御している。Therefore, in the past, methods such as stopping the supply of cooling water to the cooling vibrator (2) shown in Figure 4, changing to hot water or steam, or stopping the water flow to some cooling pipes, and cooling water flowing through each cooling pipe were used. The cooling capacity is controlled through methods such as reducing the amount of water.
一方、炉底側壁部については、同じく第4図に示す冷却
方法の場合は散水管(4)からの散水量を減少させる程
度で、特別に冷却能を制御することはなされていなかっ
た。On the other hand, regarding the side wall of the furnace bottom, in the case of the cooling method also shown in FIG. 4, the amount of water sprayed from the water sprinkler pipe (4) was reduced, and the cooling capacity was not specially controlled.
発明が解決しようとする課題
最近の高炉は前記した通り、高熱伝導性の耐火煉瓦を使
用しており、高炉の規模により多少異なるが、炉底から
の抜熱量の約40%が底盤からの抜熱であり、側壁の上
部および下部からそれぞれ30%の抜熱があることが知
られている。Problems to be Solved by the Invention As mentioned above, recent blast furnaces use refractory bricks with high thermal conductivity, and although it varies somewhat depending on the size of the blast furnace, approximately 40% of the heat extracted from the bottom of the furnace is extracted from the bottom plate. It is known that 30% of heat is removed from the upper and lower parts of the side wall.
これに対し、従来行われている炉底側壁部に対する鉄皮
シャワー冷却の水量を調整する方法では、約100−2
00Kcal/m ”hr’Cと極めて大きな熱伝達係
数しか得られないため、高炉の減産、増産、休風等の生
産変動に十分に対応できず、炉底に溜った溶銑滓の排出
に困難をきたしたり、また炉内に残留する溶銑滓が増加
すると炉下部の有効内容積が減少し、送風圧が高くなる
等の問題が生ずる。On the other hand, the conventional method of adjusting the amount of water for cooling the shell shower on the side wall of the furnace bottom has a
Because only an extremely large heat transfer coefficient of 00Kcal/m hr'C can be obtained, it is not possible to adequately respond to production fluctuations such as reductions in production, increases in production, or wind suspension in the blast furnace, and it is difficult to discharge hot metal slag that has accumulated at the bottom of the furnace. When the amount of hot metal slag remaining in the furnace increases, the effective internal volume of the lower part of the furnace decreases, causing problems such as an increase in blowing pressure.
そこで、例えば休風時間中は炉底に溜った溶銑滓が出銑
口レベルまで凝固してしまわないことを前提に休風時間
が設定されている。すなわち、第5図に出銑比と休風可
能時間の関係を示すように、高炉の生産性に合せて休風
時間が制限される。Therefore, for example, the wind down time is set on the premise that the hot metal slag accumulated at the bottom of the furnace does not solidify to the level of the tap hole during the wind down time. That is, as shown in FIG. 5, which shows the relationship between the pig iron production ratio and the possible wind down time, the wind down time is limited according to the productivity of the blast furnace.
現状の炉底冷却設備では、出銑比1.2t/D/m以下
では休風が不可能となり、高炉の定期的な保守すら困難
となっている。With the current bottom cooling equipment, it is impossible to shut down the blast furnace when the iron output ratio is below 1.2 t/D/m, making it difficult to maintain the blast furnace regularly.
以上の休風時間に対する制約を緩和するためにも、炉底
の冷却能力の弾力的対応が必要となっている。In order to alleviate the above-mentioned restrictions on wind down time, it is necessary to flexibly respond to the cooling capacity of the bottom of the furnace.
この発明はこのような現状よりみて、特に減産時におけ
る炉底の過冷却を防止するため側壁部の冷却制御を行い
、炉底の状態を減産、増産に応じて常に最適に保持し得
る炉底冷却制御方法を提案しようとするものである。In view of the current situation, this invention provides a furnace bottom that controls cooling of the side wall to prevent overcooling of the furnace bottom, especially when production is reduced, and that maintains the furnace bottom in an optimal state at all times in response to production reductions and increases. This paper attempts to propose a cooling control method.
課題を解決するための手段
この発明は特に炉底側壁部の冷却制御手段として、高炉
炉底から高さ2.8mまでの炉底側壁部に、散水管のオ
ーバーフロー式冷却水受を突設し、該冷却水受に配管接
続した排水用バルブの開閉制御にて当該冷却水受内の冷
却水の排出およびオーバーフロー制御を行うことを要旨
とするものである。Means for Solving the Problems The present invention provides an overflow type cooling water receiver for a water sprinkler pipe projecting from the bottom side wall of the blast furnace up to a height of 2.8 m from the bottom of the blast furnace, as a means for controlling the cooling of the bottom side wall of the blast furnace. The gist of the system is to control the discharge and overflow of the cooling water in the cooling water receiver by controlling the opening and closing of a drainage valve pipe-connected to the cooling water receiver.
作 用
炉底側壁部に配設した散水管からのシャワー冷却水は、
その下方に突設した冷却水受に受けられ、これより下方
の冷却を停止したい場合にはバルブを開いて冷却水受内
の冷却水を排出する。The shower cooling water from the sprinkler pipe installed on the side wall of the bottom of the furnace is
The cooling water is received by a cooling water receiver protruding below the cooling water receiver, and when it is desired to stop cooling below this, the valve is opened and the cooling water in the cooling water receiver is discharged.
また、冷却水受より下方を冷却したい場合はバルブを閉
じ、当該冷却水受内の冷却水をオーバーフローさせて下
部側壁に流下させる。Further, when it is desired to cool the area below the cooling water receiver, the valve is closed, and the cooling water in the cooling water receiver is caused to overflow and flow down to the lower side wall.
ここで、炉底側壁部に冷却水受けを設けて冷却制御を行
う領域(水冷停止域)を、高炉底盤から高さ 2.8m
までの領域に限定した理由を以下に説明する。Here, a cooling water receiver is provided on the side wall of the furnace bottom to control the cooling area (water cooling stop area) at a height of 2.8 m from the blast furnace bottom plate.
The reason for limiting the scope to the above areas will be explained below.
すなわち、高炉底盤から高さLmまでの領域のシャワー
水冷を停止した場合の炉壁の温度上昇と炉芯部煉瓦内温
度の上昇量を計算により求めた結果、水冷停止域を側壁
上部にまで拡大すると炉芯部の煉瓦温度も上昇し、炉底
の保温に有効に作用するが、これに伴い側壁煉瓦の温度
が上昇し側壁耐火物および鉄皮の溶損を引起して、炉内
に蓄えられた溶銑滓が炉底から漏れる事故を起しかねな
い。In other words, as a result of calculating the temperature rise of the furnace wall and the amount of rise in the temperature inside the furnace core brick when shower water cooling is stopped in the area from the bottom of the blast furnace to a height Lm, the water cooling stop area is expanded to the upper part of the side wall. As a result, the temperature of the bricks in the furnace core also rises, which works effectively to keep the bottom of the furnace warm; however, the temperature of the sidewall bricks rises, causing melting of the sidewall refractories and the iron shell, and causing heat to accumulate in the furnace. This may cause an accident in which the molten metal slag leaks from the bottom of the furnace.
このような事故を生じさせないためには、従来までの経
験的な知見によると炉底側壁の温度を約200℃以下に
保つ必要があるとされている。すなわち、底盤から高さ
2.8mまでは炉壁温度が200℃以下に保たれ、水
冷を停止しても問題ないが、これより上部の側壁領域の
水冷を停止すると側壁溶損のおそれがある。したがって
、冷却水受を設けて炉底側壁部の冷却制御を行う領域は
底盤がら2.8mの高さまでの範囲が好ましいのである
。In order to prevent such an accident from occurring, according to conventional empirical knowledge, it is necessary to maintain the temperature of the furnace bottom side wall at about 200° C. or lower. In other words, the furnace wall temperature is kept below 200℃ from the bottom plate to a height of 2.8 m, and there is no problem even if water cooling is stopped, but if water cooling is stopped in the side wall area above this, there is a risk of side wall melting. . Therefore, it is preferable that the area where the cooling water receiver is provided to control the cooling of the side wall of the furnace bottom is within a height of 2.8 m from the bottom plate.
この発明方法は、炉底部の温度に応じて散水管のシャワ
ー冷却を制御することができるので、炉底からの抜熱量
を炉底側壁煉瓦を溶損することなく減少させることが可
能となる。This invention method can control the shower cooling of the water sprinkler pipe according to the temperature of the furnace bottom, so it is possible to reduce the amount of heat removed from the furnace bottom without melting down the furnace bottom side wall bricks.
実施例
第1図はこの発明の一実施例を示す概略図で、〈11)
は炉底側壁、(12)は鉄皮、〈13)は散水管、(1
4)は冷却水受であり、冷却水受にはバルブ(16)付
きの排水管(15)が接続され、さらにオーバーフロー
水を受けて流下させるためのガイド溝(17〉が設けら
れている。Embodiment FIG. 1 is a schematic diagram showing an embodiment of the present invention.
is the furnace bottom side wall, (12) is the iron shell, <13) is the water pipe, (1
4) is a cooling water receiver, to which a drain pipe (15) with a valve (16) is connected, and a guide groove (17) for receiving and flowing overflow water is provided.
スナわち、散水管(13)のシャワー冷却水はその下方
に突設した冷却水受(14)にて受けられ、Aルブ(1
6)が閉じている場合はオーバーフローしてガイド溝(
17)内を流れ、炉底側壁(11〉を冷却する。In other words, the shower cooling water from the sprinkler pipe (13) is received by the cooling water receiver (14) protruding below the water pipe (13).
6) is closed, it will overflow and the guide groove (
17) and cools the furnace bottom side wall (11>).
また、バルブ(16)が開の場合は排水管(15)にて
排水され、該冷却水受(14)より下方の炉底側壁の水
冷を停止するようになっている。Further, when the valve (16) is open, water is drained through a drain pipe (15), and water cooling of the side wall of the furnace bottom below the cooling water receiver (14) is stopped.
第2図はA高炉(内容積1850m ” )に第1図に
示すこの発明方法を適用し、炉底側壁部の冷却を制御し
た結果を示す。FIG. 2 shows the results of controlling the cooling of the bottom side wall of a blast furnace A (inner volume 1850 m'') by applying the method of the present invention shown in FIG.
この図から明らかなごとく、側壁温度を 200℃以下
に保ちながら炉底温度を上昇させることができた。この
結果、炉底からの抜熱量を、炉底側壁煉瓦を溶損するこ
となく約10%減少させることができた。As is clear from this figure, it was possible to raise the hearth bottom temperature while keeping the side wall temperature below 200°C. As a result, the amount of heat extracted from the hearth bottom could be reduced by approximately 10% without melting and damaging the hearth side wall bricks.
また、第3図は炉芯煉瓦温度に及ぼす各種水冷制御効果
を例示したもので、減産操業体制に入りて以降、炉芯煉
瓦温度が低下してきたので、まず底盤冷却を制約して温
度上昇をはかったが、十分な効果が得られなかったため
、本発明法により側壁の水冷を制御した。その結果、炉
芯煉瓦温度を通常操業時のレベルにまで回復することが
できた。In addition, Figure 3 illustrates various water cooling control effects on the temperature of the furnace core bricks.Since the start of reduced production operations, the temperature of the furnace core bricks has been decreasing, so we first restricted the bottom plate cooling to prevent the temperature from rising. However, since a sufficient effect could not be obtained, the water cooling of the side wall was controlled by the method of the present invention. As a result, the temperature of the furnace core bricks was able to be restored to the level of normal operation.
発明の詳細
な説明したごとく、この発明方法によれば、散水管の下
方に設置した冷却水受の排水バルブの開閉制御のみで炉
底側壁部の抜熱量を制御することができるので、炉内に
蓄えられている溶銑滓の温度を一定に保つことが可能と
なり、高炉の生産変動に弾力的に対応することができ、
出銑滓作業の安定化と操業の維持に犬なる効果を奏する
ものである。As described in detail, according to the method of the present invention, the amount of heat removed from the furnace bottom side wall can be controlled only by opening and closing the drain valve of the cooling water receiver installed below the sprinkler pipe. This makes it possible to maintain a constant temperature of the hot metal slag stored in the blast furnace, making it possible to flexibly respond to production fluctuations in the blast furnace.
This has a positive effect on stabilizing the tap slag work and maintaining operations.
第1図はこの発明の一実施例を示す概略図、第2図は同
上実施例における炉底側壁水冷停止による煉瓦温度の上
昇効果を示す図、第3図は同じく炉芯煉瓦温度に及ぼす
各種水冷制御の効果を示す図、第4図は従来の高炉炉底
部冷却手段の一例を示す概略縦断面図、第5図は高炉の
出銑比と休風可能な時間との関係を示す図である。
11・・炉底側壁 12・・・鉄皮13・・
・散水管 14・・・冷却水受15・・・
排水管 16・・・バルブ17・・・ガイ
ド溝Fig. 1 is a schematic diagram showing an embodiment of the present invention, Fig. 2 is a diagram showing the effect of increasing brick temperature due to stopping water cooling on the bottom side wall in the same embodiment, and Fig. 3 is a diagram showing various effects on the temperature of the furnace core bricks. Figure 4 is a diagram showing the effect of water cooling control, Figure 4 is a schematic vertical cross-sectional view showing an example of a conventional blast furnace bottom cooling means, and Figure 5 is a diagram showing the relationship between the blast furnace tapping ratio and the time during which air can be shut down. be. 11... Hearth bottom side wall 12... Iron shell 13...
・Water pipe 14...Cooling water receiver 15...
Drain pipe 16... Valve 17... Guide groove
Claims (1)
底盤から高さ2.8mまでの領域の炉底側壁部に、前記
散水管のオーバーフロー式冷却水受を突設し、該冷却水
受けに配管接続したバルブの開閉制御にて当該冷却水受
内の冷却水の排出およびオーバーフロー制御を行うこと
を特徴とする高炉の炉底冷却制御方法。In a blast furnace equipped with a water sprinkler pipe for cooling on the side wall of the furnace bottom, an overflow type cooling water receiver for the water sprinkler pipe is protruded from the side wall of the furnace bottom in an area up to a height of 2.8 m from the bottom plate of the blast furnace, and the cooling water A method for controlling bottom cooling of a blast furnace, characterized in that discharge and overflow of cooling water in a cooling water receiver is controlled by opening/closing control of a valve pipe-connected to the receiver.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP7393290A JPH03274208A (en) | 1990-03-23 | 1990-03-23 | Method for controlling cooling of furnace bottom in blast furnace |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP7393290A JPH03274208A (en) | 1990-03-23 | 1990-03-23 | Method for controlling cooling of furnace bottom in blast furnace |
Publications (1)
Publication Number | Publication Date |
---|---|
JPH03274208A true JPH03274208A (en) | 1991-12-05 |
Family
ID=13532394
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP7393290A Pending JPH03274208A (en) | 1990-03-23 | 1990-03-23 | Method for controlling cooling of furnace bottom in blast furnace |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPH03274208A (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2007077440A (en) * | 2005-09-13 | 2007-03-29 | Kobe Steel Ltd | Method for operating blast furnace under condition of blowing-stop with reduced molten iron level |
KR100805051B1 (en) * | 2001-10-25 | 2008-02-20 | 주식회사 포스코 | A cooling water blocking device for repairing the furnace bottom |
KR101466485B1 (en) * | 2013-05-31 | 2014-11-28 | 현대제철 주식회사 | Cover for apparatus of blast furnace |
-
1990
- 1990-03-23 JP JP7393290A patent/JPH03274208A/en active Pending
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR100805051B1 (en) * | 2001-10-25 | 2008-02-20 | 주식회사 포스코 | A cooling water blocking device for repairing the furnace bottom |
JP2007077440A (en) * | 2005-09-13 | 2007-03-29 | Kobe Steel Ltd | Method for operating blast furnace under condition of blowing-stop with reduced molten iron level |
KR101466485B1 (en) * | 2013-05-31 | 2014-11-28 | 현대제철 주식회사 | Cover for apparatus of blast furnace |
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