JPH02200708A - Method for operating blast furnace - Google Patents
Method for operating blast furnaceInfo
- Publication number
- JPH02200708A JPH02200708A JP1770789A JP1770789A JPH02200708A JP H02200708 A JPH02200708 A JP H02200708A JP 1770789 A JP1770789 A JP 1770789A JP 1770789 A JP1770789 A JP 1770789A JP H02200708 A JPH02200708 A JP H02200708A
- Authority
- JP
- Japan
- Prior art keywords
- furnace
- coke
- blast furnace
- reactivity
- sintered ore
- 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
- 238000000034 method Methods 0.000 title description 5
- 239000000571 coke Substances 0.000 claims abstract description 100
- 230000009257 reactivity Effects 0.000 claims abstract description 30
- 238000011017 operating method Methods 0.000 claims description 4
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 abstract description 40
- 229910052742 iron Inorganic materials 0.000 abstract description 20
- 230000035699 permeability Effects 0.000 abstract description 12
- 230000002829 reductive effect Effects 0.000 abstract description 10
- 238000000227 grinding Methods 0.000 abstract description 5
- 239000007788 liquid Substances 0.000 abstract description 5
- 230000001603 reducing effect Effects 0.000 abstract description 5
- 239000002994 raw material Substances 0.000 abstract 1
- 239000002245 particle Substances 0.000 description 23
- 238000006722 reduction reaction Methods 0.000 description 22
- 238000006243 chemical reaction Methods 0.000 description 20
- 238000002309 gasification Methods 0.000 description 9
- 239000002184 metal Substances 0.000 description 8
- 229910052751 metal Inorganic materials 0.000 description 8
- 230000002093 peripheral effect Effects 0.000 description 8
- 239000003245 coal Substances 0.000 description 7
- 230000007423 decrease Effects 0.000 description 6
- 230000000694 effects Effects 0.000 description 5
- 238000005338 heat storage Methods 0.000 description 5
- 238000009423 ventilation Methods 0.000 description 5
- 238000007796 conventional method Methods 0.000 description 4
- 230000006866 deterioration Effects 0.000 description 4
- 239000000843 powder Substances 0.000 description 4
- 230000003247 decreasing effect Effects 0.000 description 3
- 239000002893 slag Substances 0.000 description 3
- 238000003860 storage Methods 0.000 description 3
- 239000000428 dust Substances 0.000 description 2
- 238000010406 interfacial reaction Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 238000010951 particle size reduction Methods 0.000 description 2
- 238000010998 test method Methods 0.000 description 2
- 235000019738 Limestone Nutrition 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 238000005299 abrasion Methods 0.000 description 1
- 238000010009 beating Methods 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 239000011449 brick Substances 0.000 description 1
- 239000003054 catalyst Substances 0.000 description 1
- 238000004939 coking Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 239000006028 limestone Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 238000012856 packing Methods 0.000 description 1
- 238000010298 pulverizing process Methods 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 230000001629 suppression Effects 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
Landscapes
- Manufacture Of Iron (AREA)
Abstract
Description
【発明の詳細な説明】
（産業上の利用分野）
本発明は、反応性を高めたコークスを炉頂から装入され
るコークスの一部として使用し、かつ反応性を低めたコ
ークスを、炉頂から装入されるコークスの一部として使
用４゛ることによって、生産性を向上させた高炉操業方
法に関する。Detailed Description of the Invention (Industrial Application Field) The present invention uses coke with increased reactivity as part of the coke charged from the top of the furnace, and coke with reduced reactivity into the furnace. It relates to a blast furnace operating method that improves productivity by using the present invention as part of coke charged from the top.
（従来の技術）
通常の高炉にあっては、炉頂から鉄鉱石及びコークスを
層状に装入し、この鉄鉱石を炉内で予備還元した後、
曇しＨＬ金属状態に還元・溶融して溶銑を製造している
。(Prior art) In a normal blast furnace, iron ore and coke are charged in layers from the top of the furnace, and after preliminary reduction in the furnace, the iron ore is reduced and melted into a cloudy HL metal state. It manufactures hot metal.
このとき、鉄鉱石の還元効率を高めるため、特公昭５１
４３１６９号公報にあっては、鉄鉱石と小塊コークスを
予め混合しておき、この混合物と通常のコークスとを層
状に装入することが開示されている。At this time, in order to increase the reduction efficiency of iron ore,
Publication No. 43169 discloses that iron ore and small coke are mixed in advance, and that this mixture and normal coke are charged in layers.
この上うｉ：予めコークスと混合した鉄鉱石を使用する
ことにより、炉内における通気性が改涛され、その還元
性が向−トする。Moreover, by using iron ore mixed with coke in advance, the permeability in the furnace is improved and its reducing property is improved.
また、高炉の炉芯部は溶融したスラグメタルが円滑に降
ドしなければならず、通気、通液性を良好に保つために
高温を維持する必要があるが、そのためには、大塊コー
クスを炉中心部に装入し、炉下部に降下してきても粒度
があまり小さくならないようにすることが行われており
、特公昭６３３０９６４号公報に開示されている。In addition, molten slag metal must fall smoothly in the core of the blast furnace, and it is necessary to maintain a high temperature in order to maintain good ventilation and liquid permeability. Japanese Patent Publication No. 6330964 discloses a method in which particles are charged into the center of the furnace so that the particle size does not become too small even when they fall to the lower part of the furnace.
（発明が解決しようとする課題）
ところが、鉄鉱石に混入されるコークスとして小塊コー
クスを使用するとき、小塊コークスは、通常冶金用コー
クスと同じ性状であるから、粒度の小さい分だけＣＯｔ
との反応がより活発であり、かつ、鉄鉱石と混合されて
いるため、鉄鉱石のＣＯ還元で生成したＣＯｌがコーク
スのすぐ近くにあり反応が速いという有利さだけで、後
述する熱保存帯温度の低下を伴わないため、その還元効
率の向上式には限界があった。(Problem to be Solved by the Invention) However, when small coke is used as coke mixed into iron ore, small coke has the same properties as metallurgical coke, and therefore COt is reduced by the smaller particle size.
Because the reaction with coke is more active and because it is mixed with iron ore, the COl produced by the reduction of iron ore is in the immediate vicinity of coke and the reaction is fast. Since it does not involve a decrease in temperature, there is a limit to the formula for improving reduction efficiency.
また炉中心部に装入される大塊コークスも、通常冶金用
コークスと同じ性状であるから、粒度の大きい分だけＣ
Ｏ，との反応がより少なく、反応による劣化に起因４−
る粒度低１；が少ないという有利さだけで、後述する熱
保存帯温度の」−昇を伴わないため、その粒度低下抑制
には限界があった。Also, the large lump coke charged into the center of the furnace has the same properties as ordinary metallurgical coke, so the larger particle size
4- due to less reaction with O, and deterioration due to reaction.
However, there is a limit to the suppression of particle size reduction because it does not involve an increase in the temperature of the thermal storage zone, which will be described later.
そこで、本発明にあっては、高炉に装入されるコークス
として炉中間部から炉周辺部にかけて反応性の高いもの
を使用することにより、熱保存帯温度を低下させて鉄鉱
イｊの還元反応を促進させ、かつ炉中心部には反応性の
低いものを使用し、熱保存帯温ｒを、に昇させてコーク
スの反応による劣化に起因する粒度低下を抑制すること
に、Ｌす、高い生産性で溶銑を製造４゛る４−１とを目
的とする。Therefore, in the present invention, by using coke that is highly reactive from the middle part of the furnace to the peripheral part of the furnace to be charged into the blast furnace, the temperature of the thermal storage zone is lowered and the reduction reaction of iron ore Ij is carried out. In order to promote this process, use a material with low reactivity in the center of the furnace, and raise the heat storage zone temperature r to suppress particle size reduction caused by deterioration due to coke reaction. The objective is 4-1 to produce hot metal with productivity.
（課題を解決４゛るための手段及び作用）本発明の高炉
操業法は、その［１的を達成するために、高炉の炉中間
部より炉周辺部にＪＩＳ反応性が３０％以１−の高反応
性コークスを装入し、炉中心部にＪＩＳ反応性が２０％
以下の低反応性コークスを装入し、炉中間部より炉周辺
部におＩＪる還元効率を向りさ仕、炉中心部における炉
芯の通気ｌｉｌ液性を確保ｉ。４、安定的に高炉を運転
することを特徴とする。(Means and effects for solving the problem) The blast furnace operating method of the present invention is designed to achieve the first objective by increasing the JIS reactivity from the middle part of the blast furnace to the peripheral part of the blast furnace by 30% or more. Highly reactive coke is charged, and the JIS reactivity is 20% in the center of the furnace.
The following low-reactivity coke is charged to direct the reduction efficiency from the middle part of the furnace to the peripheral part of the furnace, and to ensure ventilation of the furnace core in the center of the furnace. 4. It is characterized by stable operation of the blast furnace.
さらに本発明は炉中間部より炉周辺部に高反応性＝１−
クスとともに低還元粉化性焼結鉱を装入し、炉中心部に
低反応性コークスととらに高被還元性焼結鉱を装入する
ことを特徴とする。Furthermore, the present invention has a high reactivity = 1-
It is characterized by charging low-reducibility pulverizable sintered ore together with coke, and charging low-reactivity coke and highly reducible sintered ore in the center of the furnace.
まず高反応性コークスについて述べる。First, let's talk about highly reactive coke.
本発明で使用する高反応性コークスは１．ｌｌ５Ｋ２１
５１−１９７７の反応性試験方法で測定したときのＪＩ
Ｓ反応性が３・０％以−１−であることが必要である６
３０％という数値限定は、特願昭６２１９３４５７号に
示すように、実炉試験結果より２０％まではほとんどそ
の効果が見られないことによる。The highly reactive coke used in the present invention is 1. ll5K21
JI when measured by the reactivity test method of 51-1977
It is necessary that the S reactivity is 3.0% or more -1-6
The numerical limitation of 30% is based on the fact that, as shown in Japanese Patent Application No. 62193457, the effect is hardly seen up to 20% from actual furnace test results.
この高反応性コークスは、通常炉頂の炉中間部から炉周
辺部にかけて装入されるコークスの一部と置換し、鉄鉱
石および／または通常コークスとあらかじめ混合して炉
中間部から炉周辺部に装入する。二のときの高反応性コ
ークスの粒度は、１５１以１ことすることが好ましい。This highly reactive coke replaces a part of the coke that is normally charged from the middle part of the furnace to the periphery of the furnace, and is premixed with iron ore and/or normal coke. Charge to. The particle size of the highly reactive coke in the case of 2 is preferably 151 or more.
この粒度が１５□以下となるとき、コークスの単位、！
１ｉｔ１に対する表面積が増加し、反応に寄与する割合
が大きくなる。When this particle size is 15□ or less, the unit of coke,!
The surface area relative to 1it1 increases, and the proportion contributing to the reaction increases.
これに対し、粒度が１５ｍｍを越えるとき、コークス内
部がガス化反応に有効利用される割合が少なくなる。On the other hand, when the particle size exceeds 15 mm, the proportion of the inside of the coke that is effectively utilized for the gasification reaction decreases.
また、通常炉瑣の炉中間部から炉周辺部にかＩＪで装入
されるコークスの全Ｑと置換し、鉄鉱石と層状に装入す
ることもできる。このときの高反応性コークスの粒度は
通常コークスと同程度とする。In addition, it is also possible to replace all of the coke that is normally charged from the middle to the periphery of the furnace by IJ, and to charge it in a layer with iron ore. The particle size of the highly reactive coke at this time is approximately the same as that of normal coke.
高反応性となったときに劣化しない強度を保−）ことが
好ましい。It is preferable to maintain strength that does not deteriorate even when the reactivity becomes high.
ここで炉中心部とは炉［１部半径の２０％以内の部分を
示し、炉口部半径が５ｍであれば半径ｌｒｎ以内を炉中
心部と称する。この炉中心部を除いた外側が炉中間部か
ら炉周辺部というごとになる。Here, the furnace center refers to the part within 20% of the radius of the furnace [1 part], and if the furnace mouth radius is 5 m, the area within the radius lrn is called the furnace center. The outside of the furnace excluding the central part is called the middle part of the furnace and the peripheral part of the furnace.
この高反応性コークスは、たとえば次のようにして調整
される。その１つは、冶金用コークス製造に適さない、
反応性の高い微非粘結炭、−投炭を原料炭に一部配合す
ることである。また、反応を促進する触媒としての役割
をもつ石灰石、鉄鉱石、アルカリ類を少量、原料炭に配
合することも行われている。This highly reactive coke is prepared, for example, as follows. One is that it is not suitable for metallurgical coke production.
The method is to partially blend highly reactive slightly non-caking coal, or coal, into raw coal. In addition, small amounts of limestone, iron ore, and alkalis, which act as catalysts to promote reactions, are also added to coking coal.
この炉中間部から炉周辺部に装入される高反応性コーク
スは、反応性が高いことから、炉内のＣＯ，がコークス
表面に接触してＧｏとなる界面反応が円滑に行われる。Since the highly reactive coke charged from the middle part of the furnace to the peripheral part of the furnace has high reactivity, an interfacial reaction in which CO in the furnace comes into contact with the surface of the coke and becomes Go takes place smoothly.
また、その結果として炉内に生じたＣＯガスが鉄鉱石を
還元して低級酸化物又は金属状態に還元する反応も促進
される。Moreover, the reaction in which the CO gas generated in the furnace as a result reduces the iron ore to a lower oxide or metal state is also promoted.
ｅ＋ｃＯｔ−２ＣＯ
のコークスのガス化反応は吸熱反応であるから高炉ンヤ
フト部における熱保存帯の温度を低ドさせることができ
る。Since the coke gasification reaction of e+cOt-2CO is an endothermic reaction, the temperature of the heat storage zone in the shaft of the blast furnace can be lowered.
たとえば、従来法によるとき、１０００℃程度の熱保存
帯が生成しその値がほとんど変化しないのに対して、高
反応性コークスを使用することによって、熱保存帯の温
度を９００〜９５０℃に低下させることか１１能となる
。その結果、還元甲衡到達点に余裕ができるため還元が
より進行すること、及びより低温でコークスのガス化が
進行するノこめ従来より多くのＣＯガス量が生成するこ
とにより、シャフト効率、間接還元率、ＣＯガス利用率
が向１−シ、間接還元は発熱反応であるためコークス比
を低下させることができる。For example, when using the conventional method, a heat reserve zone of around 1000℃ is generated and its value hardly changes, but by using highly reactive coke, the temperature of the heat reserve zone is reduced to 900-950℃. It will be 11th ability. As a result, there is more room for reduction to reach the reduction equilibrium point, so reduction progresses further, and coke gasification progresses at a lower temperature, which generates a larger amount of CO gas than before. The reduction rate and the CO gas utilization rate are the same, and since indirect reduction is an exothermic reaction, the coke ratio can be lowered.
高反応性コークスを使用することにより、還元効率は向
上するが低温における還元が促進されるたｔ１焼結鉱の
還元粉化が助長され、粉の発生晴が増加することにより
通気性を悪化させる可能性がある。よって、炉中間部か
ら炉周辺部に装入される高反応性コークスとともに、低
還元粉化性焼結鉱を装入ケれば粉の発生は抑えられ通気
性は良好に保たれ、高反応性コークスの効果が最大限に
発揮される。The use of highly reactive coke improves reduction efficiency, but promotes reduction at low temperatures, promotes reduction powdering of T1 sintered ore, and worsens air permeability due to increased dust generation. there is a possibility. Therefore, if low-reduction pulverizable sinter is charged together with highly reactive coke, which is charged from the middle of the furnace to the periphery of the furnace, the generation of powder can be suppressed, good air permeability can be maintained, and high reactivity can be achieved. The effects of sex coke are maximized.
次に低反応性コークスについて述べる。Next, we will discuss low-reactivity coke.
本発明で使用する低反応性コークスはＪＩＳＫ２１５１
１、９７７の反応性試験方法で測定したときのＪＩＳ反
応性が２０％以Ｆであることが必“次である。２０％と
いう数値限定は実炉使用試験結果より２０％以−１−で
はほとんどその効果がみられないことによる。The low reactivity coke used in the present invention is JISK2151
It is essential that the JIS reactivity is 20% or more when measured using the reactivity test method of 1,977. This is because almost no effect is observed.
この低反応性コークスは、たとえば反応性の低い原料炭
を一部配合したり、原料炭に外力を加えて充填密度を高
くして製造する。This low-reactivity coke is produced, for example, by partially blending low-reactivity raw coal or by applying an external force to raw coal to increase its packing density.
この炉中心部に装入される低反応性コークスは反応性が
低いことから、炉内のｃｏ、がコークス表面に接触し“
ＣＣＯとなる界面反応があまり生じない。よって
Ｃ−＋−ＣＯ＊→２ＣＯ
のコークスのガス化反応が吸熱反応であることから、高
炉シャフト叩、における熱保存温度がＦ昇する。従来法
では１０００℃程度の熱保存帯が低反応性コークスを使
用４°ることによ−）で１１００〜１１５０℃に」ニジ
蓼させるひとがｉｉＪ能となる。The low-reactivity coke charged into the center of the furnace has low reactivity, so the coke inside the furnace comes into contact with the surface of the coke.
Interfacial reactions that result in CCO do not occur much. Therefore, since the coke gasification reaction of C-+-CO*→2CO is an endothermic reaction, the heat storage temperature in the blast furnace shaft beating increases by F. In the conventional method, a heat storage zone of about 1000°C can be raised to 1100 to 1150°C by using low-reactivity coke.
一般にコークスのガス化反応が活発だと表面付近の反応
した部分が劣化し、炉内における摩耗等の衝撃を受けて
粉が発生し粒度が低下するが、低反応性コークスを使用
することにより、粒度の低下が大きく抑制される。Generally, when the gasification reaction of coke is active, the reacted area near the surface deteriorates, and when subjected to shocks such as wear in the furnace, powder is generated and the particle size decreases, but by using low-reactivity coke, Decrease in particle size is greatly suppressed.
この結果、この低反応性コークスが炉下部に降下し、炉
芯に入っても、その粒度が大きいため、炉芯部の通気、
通液性が良好で安定したスラグ、メタルが炉底に流出し
ていく。低反応性コークスを使用することにより、粉の
発生屑が少なく大塊が炉芯部に降下するが、ガス化反応
が抑制されるため鉄鉱石の還元性は低下する。よって炉
中心部に装入される低反応性コークスとともに高被還元
性焼結鉱を装入すれば、炉中心部における還元効率は維
持される。As a result, even if this low-reactivity coke falls to the bottom of the furnace and enters the furnace core, its particle size is large, so the ventilation of the furnace core is reduced.
Stable slag and metal with good liquid permeability flow out to the bottom of the furnace. By using low-reactivity coke, less powder debris is generated and large lumps fall into the furnace core, but the gasification reaction is suppressed and the reducibility of iron ore is reduced. Therefore, if highly reducible sintered ore is charged together with the low reactivity coke charged into the furnace center, the reduction efficiency in the furnace center can be maintained.
（実施例）
以下、実施例により本発明の特徴を員体的ζご説明する
。(Example) Hereinafter, the features of the present invention will be explained in detail with reference to Examples.
第１表に高反応性コークスを使用した高炉操業を、従来
法と比較Ｉ１、て示す。Table 1 shows a comparison of blast furnace operation using highly reactive coke with the conventional method.
対象高炉は内容積３０００ｒｎ”の中型高炉であり、従
来法では炉頂からＯ／Ｃ＝３．２の割合で鉄鉱石と通常
コークスを装入し、羽［］前フレーム温度を２２７０℃
（熱風温度１１００℃、添加湿分３５ ｇ／Ｎｍ″□、
微粉炭吹込みなし）に維持しなから溶銑を製造していた
ｃｔｒｅＵデ１）。The target blast furnace is a medium-sized blast furnace with an internal volume of 3000 rn'', and in the conventional method, iron ore and normal coke are charged from the top of the furnace at a ratio of O/C = 3.2, and the flame temperature before the vane is set at 2270°C.
(Hot air temperature 1100℃, added moisture 35 g/Nm''□,
The company was manufacturing hot metal without pulverized coal injection (1).
実施例１には、通常コークスの１５％をＪＩＳ反応性３
５％、粒度１５ｍ５の高反応性コークスに置換し、該高
反応性コークスを鉄鉱石し混合して炉中間部から炉周辺
部にかけて装入した。そしてさらに、通常コークスの５
％をＪＩＳ反応性１８％、粒度５０ａ＋ｓの低反応性コ
ークスに置換し、該低反応性コークスを炉中心部に普通
焼結鉱と交互に装入した。炉中間部から炉周辺部で熱保
存帯温塵は９５０℃に低下し、炉中心部では、１１００
℃にＬ昇した。炉中間部から炉周辺部でのガス利用率は
１．５％向−トし、炉中心部では１．５％減少したが、
炉中心部の断面積が狭いこともあって全体的には、１．
１％向干、した。In Example 1, 15% of the normal coke was JIS reactivity 3.
The coke was replaced with highly reactive coke having a particle size of 5% and a particle size of 15 m5, and the highly reactive coke was mixed with iron ore and charged from the middle part of the furnace to the peripheral part of the furnace. Furthermore, 5 of normal coke
% was replaced with low-reactivity coke having a JIS reactivity of 18% and a particle size of 50a+s, and the low-reactivity coke was charged into the center of the furnace alternately with ordinary sintered ore. Temperature dust in the heat storage zone decreases to 950℃ from the middle of the furnace to the periphery, and in the center of the furnace it decreases to 1100℃.
The temperature rose to ℃. The gas utilization rate from the middle of the furnace to the periphery increased by 1.5%, and decreased by 1.5% at the center of the furnace.
Due to the narrow cross-sectional area of the furnace center, the overall results are as follows: 1.
1% drying.
また、炉芯部の通気通液性を示す指標として、炉底部レ
ンガ温度が１８℃」二昇している。この結果高炉全体の
通気性も向上しく送風圧力が低下し）ガス利用率向りに
よるコークス比低下も達成された。Additionally, as an indicator of the ventilation and liquid permeability of the furnace core, the temperature of the bricks at the bottom of the furnace increased by 18°C. As a result, the permeability of the entire blast furnace was improved, the blowing pressure was reduced, and the coke ratio was also reduced due to the gas utilization rate.
実施例２には通常コークスの１５％をＪｔＳ反応性３５
％、粒度（５ｍｓの高反応性コークスに置換し、該高反
応性コークスを１／２ずっ鉄鉱石と通常コークスに混合
して炉中間部から炉周辺部に装入した。そして炉中間部
から炉周辺部に装入される鉄鉱石中の焼結鉱として還元
粉化率の５％低いものを用いた。また通常コークスの５
％をＪＩＳ反応性１８％、粒度５０ｍ５の低反応性コー
クスに置換し、該低反応性コークスと被還元性を８％向
ｌ二させた焼結鉱を交互に炉中心部に装入した。炉中間
部から炉周辺部にかけてのガス利用率が向上し、かつ炉
中心部のガス利用率が向トしたので、全体としてのガス
利用率は１．４％向１−シた。そして高炉の全体の通気
性（送風圧力）も向上しており、ガス利用率向上により
コークス比も低ドした。In Example 2, 15% of the coke was normally mixed with JtS reactivity 35
%, particle size (5 ms), and the highly reactive coke was mixed with 1/2 iron ore and normal coke and charged from the middle part of the furnace to the peripheral part of the furnace.Then, from the middle part of the furnace As the sintered ore in the iron ore charged around the furnace, we used sintered ore with a reduction powdering rate of 5% lower.
% was replaced with low-reactivity coke having a JIS reactivity of 18% and a particle size of 50 m5, and the low-reactivity coke and sintered ore having a reducibility of 8% were alternately charged into the center of the furnace. The gas utilization rate from the middle of the furnace to the periphery of the furnace improved, and the gas utilization rate at the center of the furnace decreased, so the overall gas utilization rate decreased to 1.4%. The overall permeability (blow pressure) of the blast furnace has also improved, and the coke ratio has been lowered due to improved gas utilization.
実施例３には、通常コークスの９５％をＪＩＳ反応性３
０％、粒度４５ａｍの高反応性コークスに置換し、該高
反応性コークスを全量炉中間部から炉周辺部に還元粉化
率の５％低い焼結鉱と交互に装入した。また通常コーク
スの残り５％をＪＩＳ反応性２０％、粒度５０１の低反
応性コークスに置換し、該低反応性コークスと被還元性
を８％向−１′、させた焼結鉱を交互に炉中心部に装入
した。炉中間部から炉周辺部にかけてのガス利用率、炉
中心部のガス利用率、全体のガス利用率が向上し、高炉
の全体の通気性（送風圧力）も向」二しており、コーク
ス比も低下している。In Example 3, 95% of the normal coke was JIS reactivity 3.
0% and highly reactive coke with a particle size of 45 am, and the entire amount of the highly reactive coke was charged from the middle of the furnace to the periphery of the furnace alternately with sintered ore having a 5% lower reduction powdering rate. In addition, the remaining 5% of the normal coke was replaced with low-reactivity coke with a JIS reactivity of 20% and a particle size of 501, and the low-reactivity coke and sintered ore with a reducibility of 8% -1' were alternately used. It was charged into the center of the furnace. The gas utilization rate from the middle of the furnace to the periphery of the furnace, the gas utilization rate at the center of the furnace, and the overall gas utilization rate have improved, and the overall permeability (blow pressure) of the blast furnace has also improved, resulting in a lower coke ratio. is also declining.
た、燕保存帯の温度を低下させることができるため１．
シャフト効率を上げることも可能となる。In addition, the temperature of the swallow storage zone can be lowered; 1.
It is also possible to increase shaft efficiency.
さらに炉中心部に低反応性コークスを使用することζこ
より、コークスのガス化反応をすくなくし、反応による
劣化に起因するコークス粒度低下を抑制できるため、炉
芯部でのコークス粒度が大きく、炉芯部の通気、通液性
が確保され、安定したスラグ、メタル流出が達成される
。Furthermore, by using low-reactivity coke in the furnace center, the coke gasification reaction can be reduced and the reduction in coke particle size caused by reaction-induced deterioration can be suppressed, so the coke particle size in the furnace core is large and Ventilation and liquid permeability of the core are ensured, and stable slag and metal outflow is achieved.
このようにして、本発明によるとき、高炉操業の生産性
を向上させること、ができる。In this way, according to the present invention, it is possible to improve the productivity of blast furnace operation.
第１図は、コークスのＪ’ Ｉ Ｓ反応性と、ガス化反
応劣化後のコークス粒度との関係を示す図である。
出 願 人 新日本製鐵株式会社
なお、焼結鉱の還元粉化指数は、サンプル（１５〜２０
ｓｖ、５００ｇ）を還元ガス（ＣＯ３０％−Ｎ、７０％
、１５ Ｎｌ／５ｉｎ）により５５０℃で３０分間還元
し、その後回転試験腎で９００回転（３０ｒｐｍＸ３０
分子ｌｉ） 後（１） ３ ｍｓノｊ！ｔｆｆｔｎ
合（％） ヲＯＱ で示される。
また、鉄鉱石の還元率は、ＪＩＳ法で測定される９００
℃、１８０分後の還元率で表示している。
第１図は、コークスのＪＩＳ反応性とガス化反応を受は
劣化したあと摩耗等の衝撃ζこより粉を発生したあとの
粒度の関係を示す、オフライン実験結果である。ＪＩＳ
反応性が２０％以下だとコークス粒度が大きくなること
がわかる。
（発明の効果）
以上に説明したように、本発明においては、炉中間部か
ら炉周辺部にかけて高反応性コークスを使用することに
より、ガス利用効率を高めて少ないコークス比で高炉操
業を行うことができる。ま第１図
５ ２０ ２５ ’５０
コーフルクＪＩＳ々ｋｉ’Ａ−（１’FIG. 1 is a diagram showing the relationship between the J' IS reactivity of coke and the particle size of coke after deterioration by gasification reaction. Applicant: Nippon Steel Corporation Note that the reduction pulverization index of sintered ore is
sv, 500g) to reducing gas (CO30%-N, 70%
.
Molecule li) After (1) 3 ms no j! tfftn
The total (%) is expressed as OQ. In addition, the reduction rate of iron ore is 900 as measured by the JIS method.
℃, reduction rate after 180 minutes is displayed. FIG. 1 shows the results of an off-line experiment showing the relationship between the JIS reactivity of coke and the particle size after the coke has deteriorated due to gasification reaction and has been subjected to impact such as abrasion to generate powder. JIS
It can be seen that when the reactivity is 20% or less, the coke particle size becomes large. (Effect of the invention) As explained above, in the present invention, by using highly reactive coke from the middle part of the furnace to the peripheral part of the furnace, it is possible to improve gas utilization efficiency and perform blast furnace operation with a small coke ratio. Can be done. Figure 1 5 20 25 '50 Kohluk JIS Ki'A-
Claims (2)
０％以上の高反応性コークスを装入し、炉中心部にＪＩ
Ｓ反応性が２０％以下の低反応性コークスを装入するこ
とを特徴とする高炉操業法。(1) JIS reactivity of 3 from the middle part to the periphery of the blast furnace
Highly reactive coke of 0% or more is charged and JI is placed in the center of the furnace.
A blast furnace operating method characterized by charging low reactivity coke with an S reactivity of 20% or less.
とともに低還元粉化性焼結鉱を装入し、炉中心部に低反
応性コークスとともに高被還元性焼結鉱を装入すること
を特徴とする高炉操業法。(2) Charge low-reducibility pulverizable sintered ore together with highly reactive coke from the middle of the blast furnace to the periphery of the furnace, and charge highly reducible sintered ore together with low-reactivity coke into the center of the furnace. A blast furnace operating method characterized by:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1017707A JP2720058B2 (en) | 1989-01-30 | 1989-01-30 | Blast furnace operation method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1017707A JP2720058B2 (en) | 1989-01-30 | 1989-01-30 | Blast furnace operation method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH02200708A true JPH02200708A (en) | 1990-08-09 |
| JP2720058B2 JP2720058B2 (en) | 1998-02-25 |
Family
ID=11951241
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1017707A Expired - Fee Related JP2720058B2 (en) | 1989-01-30 | 1989-01-30 | Blast furnace operation method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2720058B2 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008056985A (en) * | 2006-08-31 | 2008-03-13 | Jfe Steel Kk | Method for operating blast furnace |
| JP2011252200A (en) * | 2010-06-02 | 2011-12-15 | Jfe Steel Corp | Method for operating blast furnace |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS62127413A (en) * | 1985-11-28 | 1987-06-09 | Nippon Kokan Kk <Nkk> | Raw material charging method for blast furnace |
-
1989
- 1989-01-30 JP JP1017707A patent/JP2720058B2/en not_active Expired - Fee Related
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS62127413A (en) * | 1985-11-28 | 1987-06-09 | Nippon Kokan Kk <Nkk> | Raw material charging method for blast furnace |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008056985A (en) * | 2006-08-31 | 2008-03-13 | Jfe Steel Kk | Method for operating blast furnace |
| JP2011252200A (en) * | 2010-06-02 | 2011-12-15 | Jfe Steel Corp | Method for operating blast furnace |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2720058B2 (en) | 1998-02-25 |
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