JPH02217408A - Method for operating blast furnace - Google Patents
Method for operating blast furnaceInfo
- Publication number
- JPH02217408A JPH02217408A JP3957689A JP3957689A JPH02217408A JP H02217408 A JPH02217408 A JP H02217408A JP 3957689 A JP3957689 A JP 3957689A JP 3957689 A JP3957689 A JP 3957689A JP H02217408 A JPH02217408 A JP H02217408A
- Authority
- JP
- Japan
- Prior art keywords
- furnace
- coke
- blast furnace
- highly reactive
- charged
- 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 abstract description 9
- 239000000571 coke Substances 0.000 claims abstract description 84
- 238000011017 operating method Methods 0.000 claims description 5
- 230000002093 peripheral effect Effects 0.000 claims description 5
- 238000006722 reduction reaction Methods 0.000 abstract description 27
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 abstract description 26
- 229910052742 iron Inorganic materials 0.000 abstract description 13
- 229910000805 Pig iron Inorganic materials 0.000 abstract 1
- 238000006243 chemical reaction Methods 0.000 description 11
- 239000002245 particle Substances 0.000 description 9
- 239000000446 fuel Substances 0.000 description 7
- 230000009257 reactivity Effects 0.000 description 6
- 239000013535 sea water Substances 0.000 description 6
- 238000009423 ventilation Methods 0.000 description 6
- 239000007788 liquid Substances 0.000 description 5
- 238000000227 grinding Methods 0.000 description 4
- 230000035699 permeability Effects 0.000 description 4
- 238000003860 storage Methods 0.000 description 4
- 238000007796 conventional method Methods 0.000 description 3
- 230000007423 decrease Effects 0.000 description 3
- 238000005338 heat storage Methods 0.000 description 3
- 238000010298 pulverizing process Methods 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 239000007864 aqueous solution Substances 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000007654 immersion Methods 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 239000000843 powder Substances 0.000 description 2
- 230000001737 promoting effect Effects 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 238000005245 sintering Methods 0.000 description 2
- 238000005507 spraying Methods 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000010000 carbonizing Methods 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 230000008014 freezing Effects 0.000 description 1
- 238000007710 freezing Methods 0.000 description 1
- 238000002309 gasification Methods 0.000 description 1
- 238000010406 interfacial reaction Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 230000001629 suppression Effects 0.000 description 1
- 238000010998 test 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、高炉で反応性を高めたコークスを使用するこ
と、および高反応性コークスとともに低還元粉化性焼結
鉱を使用することによって、生産性を向上させた高炉操
よ法に関する。[Detailed Description of the Invention] (Industrial Application Field) The present invention is achieved by using coke with increased reactivity in a blast furnace and by using low-reduced pulverizable sintered ore together with highly reactive coke. , concerning a blast furnace operation method that improved productivity.
（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還元した後、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 the iron ore is reduced in the furnace and then reduced and melted into a metallic state to produce hot metal. ing.
このとき、高炉を安定して操業するために、特開昭５７
−１７４４０３号公報にあっては、高炉に鉄原料とコー
クスを順次装入し精錬する高炉操業法において、高炉に
コークスを装入するにあたり、常時もしくは間欠的に炉
周辺部に１５〜２５■を平均粒度とする小塊コークスを
、炉中心部に３５〜７０ｍｍを平均粒度とする大塊コー
クスを装入し、操業することを特徴とする高炉操業法が
開示されている。At this time, in order to operate the blast furnace stably,
-174403, in a blast furnace operation method in which iron raw material and coke are sequentially charged into a blast furnace and refined, when charging coke into the blast furnace, 15 to 25 cm is constantly or intermittently placed around the furnace. A blast furnace operating method is disclosed in which small coke having an average particle size is charged into the center of the furnace and large coke having an average particle size of 35 to 70 mm is charged for operation.
また、本発明者らは特願昭６２−１９３４５７号におい
て、１５ｍｍ以下の小塊高反応性コークスを使用して、
該高反応性コークスを普通コークス又は鉱石と混合して
高炉に装入することにより、高炉の熱保存帯温度を低下
させ、高炉の反応効率を高める高炉操業法を提案した。In addition, the present inventors have disclosed in Japanese Patent Application No. 193457/1983 that using small pieces of highly reactive coke of 15 mm or less,
We proposed a blast furnace operating method in which the highly reactive coke is mixed with ordinary coke or ore and charged into the blast furnace, thereby lowering the temperature of the thermal reserve zone of the blast furnace and increasing the reaction efficiency of the blast furnace.
（発明が解決しようとする課題）
しかしながら、炉中心部に３５〜７０ｍｍを平均粒度と
する大塊コークスを、炉周辺部に１５〜２５−を平均粒
度とする小塊コークスを装入することにより、炉中心部
における炉芯の通気通液性が確保でき、安定操業が可能
と考えられるが、通常コークスを使用する操字において
は、高炉の反応効率は向上できない。(Problems to be Solved by the Invention) However, by charging large coke with an average particle size of 35 to 70 mm in the center of the furnace and small coke with an average particle size of 15 to 25 mm in the peripheral area of the furnace, Although it is thought that ventilation and liquid permeability of the furnace core in the center of the furnace can be ensured and stable operation is possible, the reaction efficiency of the blast furnace cannot be improved in normal operation using coke.
一方、高炉の反応効率を向上させるためには、小塊高反
応性コークスを鉱石またはコークスと混合して使用する
のが有効であるが、通常操業においては小塊高反応性コ
ークスは量が少なく炉中心部に到ｉ！ｔ＝ないように装
入するので、炉中心部の還元効率は向上せず、高炉半径
方向全体の反応効率は向りしにくい。また装入物分布制
御により、小塊高反応性コークスを炉中心部に装入する
と、高炉半径方向全体の反応効率は向上できるが、炉中
心部における炉芯の通気通液性の点で問題となり安定操
！に支障となる。On the other hand, in order to improve the reaction efficiency of blast furnaces, it is effective to use small-sized highly reactive coke mixed with ore or coke, but in normal operation, the amount of small-sized highly reactive coke is small. Arrived at the heart of the furnace! Since the charging is carried out so that t does not exist, the reduction efficiency in the center of the furnace does not improve, and the reaction efficiency in the entire blast furnace radial direction is difficult to improve. In addition, by controlling the charge distribution and charging small highly reactive coke into the center of the furnace, the reaction efficiency in the entire radial direction of the blast furnace can be improved, but there are problems in terms of ventilation and liquid permeability of the furnace core in the center of the furnace. Stable operation next door! It becomes a hindrance.
また、反応効率が向上でき、低燃料比操業が可能となっ
た場合でも、低燃料比操業時によく見られるように、ガ
ス流れが不均衡になり、ガス流量の少ない領域が高炉シ
ャフト部に生成すると、６００〜７００℃の低温熱保存
帯が生成し属くなるが、この部位では焼結鉱還元粉化が
助長され、それに伴う高炉シャフト部の通気不良が生じ
る結果、鉱石還元の遅れ、装入物の降下不良など、高炉
安定操業に支障となるケースが多い。In addition, even if the reaction efficiency can be improved and low fuel ratio operation becomes possible, the gas flow will be unbalanced and a region of low gas flow will be created in the blast furnace shaft, as is often seen during low fuel ratio operation. As a result, a low-temperature thermal storage zone of 600 to 700°C is generated, but this region promotes sinter reduction and pulverization, resulting in poor ventilation of the blast furnace shaft, resulting in a delay in ore reduction and There are many cases where stable operation of the blast furnace is hindered, such as when the materials do not descend properly.
そこで、本発明にあっては、高炉に装入されるコークス
の反応性を高め、かつ大塊と小塊に分別して装入するこ
とにより、熱保存帯温度を低下させて高炉全体の鉄鉱石
の還元反応を促進させ、高い反応効率下で、高生産性で
安定的に溶鉄を製造すること、ならびに低燃料比操業下
で発生しやすい焼結鉱還元粉化に伴う粉率増加を抑制し
て、安定的に高炉を操業することを目的とする。Therefore, in the present invention, by increasing the reactivity of the coke charged into the blast furnace and charging it separately into large lumps and small lumps, the temperature of the heat reserve zone is lowered and the iron ore in the entire blast furnace is reduced. It is possible to produce molten iron stably with high productivity under high reaction efficiency by promoting the reduction reaction of The purpose is to operate the blast furnace stably.
（：５題を解決するための手段および作用）本発明の高
炉操業法は、その目的を達成するために、コークスを大
塊と小塊に分別して装入する高炉において、高反応性コ
ークスを大塊と小塊に分別し、大塊高反応性コークスを
炉中心部に、小塊高反応性コークスを炉中間部より炉周
辺部に装入することにより、炉中心部における炉°芯＄
通気通液性を確保し、高炉全体の還元効率を向上させ、
低燃料比操業を可能とすることを特徴とする。また高反
応性コークスを大塊と小塊に分別し、大塊高反応性コー
クスを炉中心部に、小塊高反応性コークスを炉中間部よ
り炉周辺部に装入するに際し、該高反応性コークスとと
もに、低還元粉化性焼結鉱を装入し、低燃料比操業下で
発生しやすい焼結鉱還元粉化に伴う粉率増加を抑制して
、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 5 problems) In order to achieve the objective, the blast furnace operating method of the present invention uses highly reactive coke in a blast furnace in which coke is charged after being separated into large lumps and small lumps. By separating large coke and small coke and charging the large highly reactive coke into the center of the furnace and the small highly reactive coke from the middle to the periphery of the furnace, the core of the furnace at the center of the furnace can be reduced.
Ensures ventilation and liquid permeability, improves the reduction efficiency of the entire blast furnace,
It is characterized by enabling low fuel ratio operation. In addition, highly reactive coke is separated into large lumps and small lumps, and the large highly reactive coke is charged into the center of the furnace, and the small highly reactive coke is charged from the middle part of the furnace to the peripheral part of the furnace. To operate the blast furnace stably by charging low-reduction pulverizable sintered ore together with high-temperature coke to suppress the increase in powder ratio due to reduction and pulverization of sintered ore, which tends to occur under low fuel ratio operation. It is characterized by
まず、高反応性コークスについて述べる。First, we will discuss highly reactive coke.
本発明では使用する高反応性コークスはＪＩＳＫ２１５
１−１９７７の反応性試験方法で測定したときのＪＩＳ
反応性が３０％以上であることが望ましい、その値が３
０％未満であると、後述する熱保存帯温度の低下がほと
んどみられない。また高反応性コークスであっても強度
を高く保つことは必要であり、通常コークスと同じ程度
の強度を保つことが望ましい。The highly reactive coke used in the present invention is JISK215
JIS when measured by the reactivity test method of 1-1977
It is desirable that the reactivity is 30% or more, and the value is 3
When it is less than 0%, there is almost no decrease in the temperature of the heat storage zone, which will be described later. Furthermore, even if the coke is highly reactive, it is necessary to maintain its strength high, and it is desirable to maintain the same strength as normal coke.
高強度を有する高反応性コークスの調整法としては、強
度の高い通常コークスにアルカリ水溶液を添加する方法
または一般炭を成型して乾留する方法などがある。Methods for preparing highly reactive coke with high strength include a method of adding an alkaline aqueous solution to high-strength ordinary coke, or a method of molding steam coal and carbonizing it.
高反応性コークスは通常炉頂から装入されるコ−クスの
一部あるいは全量と置換し、かっ該高反応性コークスを
大塊と小塊に分別し、大塊を通常コークスと混合するか
、あるいは単独で炉中心部に鉄鉱石と交互に層状装入す
る。小塊は炉中間部から炉周辺部に鉄鉱石および／また
は通常コークスと混合して装入するか、あるいは単独で
鉄鉱石と交互に層状装入する。Either the highly reactive coke replaces part or all of the coke normally charged from the top of the furnace, the highly reactive coke is separated into large lumps and small lumps, and the large lumps are mixed with the normal coke. Alternatively, it can be charged alone in layers alternately with iron ore in the center of the furnace. The nodules are charged from the middle of the furnace to the periphery of the furnace in a mixture with iron ore and/or coke, or alone in layers alternating with iron ore.
本発明において、炉中心部とは高炉の炉口部半径の２０
％以内の部分を示し、例えば炉口部半径ｈ（５ｍであれ
ば半径１ｍ以内を炉中心部と称する。In the present invention, the furnace center is defined as 20 mm of the furnace mouth radius of the blast furnace.
For example, if the furnace mouth radius h (5 m), the area within 1 m radius is referred to as the furnace center.
この炉中心部を除いた炉壁までの外側を炉中間部から炉
周辺部と称する。The area outside the furnace wall excluding the furnace center is called the furnace middle area to the furnace periphery area.
炉中間部から炉周辺部に装入される鉄鉱石および／また
は通常コークスに混合使用する高反応性コークスのｒＬ
Ｉｔは１５ｔｓ以下とすることが望ましい。この粒度が
１５ｓ＋ｍ以下であれば、コークスの単位重量に対する
表面積が増加し、反応に寄与する割合が大きくなる。rL of highly reactive coke used mixed with iron ore and/or normal coke charged from the middle part of the furnace to the peripheral part of the furnace
It is desirable that It is 15ts or less. If this particle size is 15 s+m or less, the surface area per unit weight of coke increases, and the proportion contributing to the reaction increases.
この高反応性コークスは反応性が高いことから、炉内の
ＣＯｌがコークス表面に接触してＣＯとなる界面反応が
円滑に行われる。また、その結果として炉内に生じたＣ
Ｏガスが鉄鉱石と有効に反応して低級酸化物又は金属状
態に還元する反応が促進される。Since this highly reactive coke has high reactivity, an interfacial reaction in which COl in the furnace comes into contact with the surface of the coke to become CO takes place smoothly. In addition, as a result, the C generated in the furnace
The O gas effectively reacts with the iron ore to promote the reaction of reducing it to a lower oxide or metal state.
Ｃ＋ＣＯ，＝２ＧＯのコークスのガス化反応は吸熱反応
であり、高炉シャフト部における熱保存帯の温度を低下
させることができる。例えば、従来法によるとき、１０
００℃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”Ｃに低下さ
せることが可能となる。その結果、還元平衡到達点に余
裕ができるため還元がより進行することになり、シャフ
ト効率、間接還元率、ｃｏガス利用率が向上し、コーク
ス比を低下させることができる。The coke gasification reaction of C+CO,=2GO is an endothermic reaction and can lower the temperature of the heat storage zone in the blast furnace shaft. For example, when using the conventional method, 10
A heat reserve zone of approximately 00°C is generated, and its value hardly changes. However, by using highly reactive coke, it is possible to lower the temperature of the heat reserve zone to 900-950"C. As a result, there is a margin at the point at which the reduction equilibrium is reached, so that the reduction progresses further, and the shaft efficiency, indirect reduction rate, and co gas utilization rate are improved, and the coke ratio can be lowered.
また大塊高反応性コークスとして粒１ｔ３５〜７゜■の
高反応性コークスを炉中心部へ装入することによって、
炉中心部における炉芯の通気通液性が確保され、安定し
た操業が可能となり、かつ炉中心部に装入された鉄鉱石
の還元が促進されるため、高炉半径方向全体の還元効率
が向上できる。In addition, by charging highly reactive coke with grain size of 1t35~7゜ as large block highly reactive coke into the center of the furnace,
The ventilation and liquid permeability of the furnace core in the center of the furnace is ensured, enabling stable operation, and promoting the reduction of iron ore charged in the center of the furnace, improving the reduction efficiency in the entire radial direction of the blast furnace. can.
次に焼結鉱の還元粉化抑制について述べる。Next, we will discuss the suppression of reduction and powdering of sintered ore.
高反応性コークス使用により還元効率が向上できるため
、燃料比を大巾に低下させた操業が可能となるが、その
際、高炉シャフト部の温度低下に起因して、焼結鉱の還
元粉化量は増大傾向となる。The reduction efficiency can be improved by using highly reactive coke, making it possible to operate with a significantly lower fuel ratio. The amount tends to increase.
特に、高炉シャフト部に６００〜７００℃の低温熱保存
帯が生成すると、焼結鉱の還元粉化量は顕署に増大し、
高炉安定操業に支障となる。In particular, when a low-temperature thermal storage zone of 600 to 700°C is formed in the blast furnace shaft, the amount of reduction and powdering of sintered ore increases significantly.
This will impede the stable operation of the blast furnace.
この対策とし、通常焼結鉱を全量低還元粉化性焼結鉱に
置換し、高反応性コークスとともに装入する。あるいは
、通常は普通焼結鉱を装入しておき、６００〜７００℃
の低温熱保存帯の生成を検出しながら、その低温熱保存
帯が発生したときに１、ｉ！Ｉ常焼結鉱の装入を止め、
全量低温還元粉化性焼結鉱を装入する。As a countermeasure to this, the entire amount of normal sintered ore is replaced with low-reduction pulverizable sintered ore and charged together with highly reactive coke. Alternatively, normally sintered ore is charged and the temperature is heated to 600 to 700℃.
While detecting the formation of a low-temperature thermal storage zone, when the low-temperature thermal storage zone occurs, 1, i! Stop charging of I-ever sintered ore,
Charge the entire amount of low-temperature reduction pulverizable sintered ore.
低還元粉化性焼結鉱の製造は、焼結操業における原料配
合調整、操業！Ｆｌ整（コークス原単位の変更など）で
可能であり、また、普通焼結鉱に海水や高炉シブフナ−
水などのアルカリ水溶液を添加して製造することもでき
る。The production of low-reduction pulverizable sintered ore involves adjusting the raw material mix and operating the sintering operation! It is possible to do this by adjusting Fl (changing the coke consumption unit, etc.), and adding seawater or blast furnace sinter to ordinary sintered ore.
It can also be produced by adding an alkaline aqueous solution such as water.
第１図は焼結鉱の還元粉化指数（ＲＤ Ｉと略す）、Ｊ
ＩＳ還元率と海水浸漬時間との関係を示したもので、海
水に約５秒浸漬させた場合、焼結！ＲＤＩは３５〜４０
％が１５％にまで低下する一方、焼結鉱ＪＩＳ還元率は
不変であり、焼結鉱への海水添加は焼結鉱被還元性に影
響を与えず、還元粉化抑制に効果を発揮する。Figure 1 shows the reduced pulverization index (abbreviated as RDI) of sintered ore, J
This shows the relationship between IS reduction rate and seawater immersion time.When immersed in seawater for about 5 seconds, sintering occurs! RDI is 35-40
% decreases to 15%, while the sintered ore JIS reduction rate remains unchanged, and the addition of seawater to sintered ore does not affect the sintered ore reducibility and is effective in suppressing reduction powdering. .
なお、ＲＤ Ｉ ハサンプＬ （１５〜２０ｍｓ、５０
０ｇ）を還元ガス（ＣＯ３０％−Ｎ、７０％、１５Ｍ１
／５ｉｎ）ニヨ’） ５５０℃で３０分間還元し、その
後回転試験機で９００回転（３０ｒｐ＊Ｘ３０分間）後
の一３■−の重量割合をもって示される。また、焼結鉱
の還元率はＪＩＳ法で測定される９００℃。In addition, RDI hasamp L (15~20ms, 50
0g) into reducing gas (CO30%-N, 70%, 15M1
/5in) Niyo') After reduction at 550° C. for 30 minutes and then 900 revolutions (30 rp*×30 minutes) using a rotation tester, it is expressed as a weight ratio of 13. In addition, the reduction rate of sintered ore is 900°C as measured by JIS method.
１８０分後の還元率で表示している。The return rate is displayed after 180 minutes.
（実施例） 以下、実施例により本発明の特徴を具体的に説明する。(Example) Hereinafter, the features of the present invention will be specifically explained with reference to Examples.
第１表に高反応性コークスおよび低還元粉化性焼結鉱を
使用した高炉操業を従来法と比較して示す。Table 1 shows a comparison of blast furnace operation using highly reactive coke and low reduction pulverizable sintered ore with the conventional method.
対象高炉は内容積３０００ｍ’の中型高炉であり、従来
法では炉頂からＯ／Ｃ＝３．２の割合テ鉄鉱石と通常コ
ークスを装入し、羽口前フレーム温度を２２７０℃（熱
風温度１１００℃、添加湿分３５ｇ／Ｎ■３、微粉炭吹
き込みなし）に維持しなから溶銑を製造していた（比較
例）
実施例１は通常コークスを全量高反応性コークス（ＪＩ
Ｓ反応性５０％）に置換した例で、粒度５０ｍｍ以上が
２０％、粒度５０ｍｍ未満が８０％であり、焼結鉱は通
常焼結鉱（ＲＤ１４０％）に海水を噴霧して低ＲＤＩ焼
結鉱（ＲＤ １２０％）としている。The target blast furnace is a medium-sized blast furnace with an internal volume of 3000 m'. 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 in front of the tuyere is set at 2270 °C (hot air temperature (Comparative example) In Example 1, the entire amount of normal coke was replaced with highly reactive coke (JI
In this example, 20% has a particle size of 50 mm or more, and 80% has a particle size of less than 50 mm.Sintered ore is usually sintered with low RDI by spraying seawater on sintered ore (RD140%). ore (RD 120%).
実施例２は通常コークスの５０％を高反応性コークス（
ＪＩＳ反応性５０％）に置換した例で、そのうち１５ｍ
ｍ超が７０％、粒度１５１以下が３０％であり、焼結鉱
は通常焼結鉱（ＲＤ １４０％）にソックナー水を噴霧
して低ＲＤＩ焼結鉱（ＲＤ１２２％）としている。In Example 2, 50% of the normal coke was replaced with highly reactive coke (
JIS reactivity 50%), of which 15m
70% has a particle size of more than m, and 30% has a particle size of 151 or less, and the sintered ore is usually made into a low RDI sintered ore (RD 122%) by spraying sockner water on the sintered ore (RD 140%).
装入方法は、実施例１の場合、高反応性コークスの大塊
を中心ｉに、小塊を炉中間部から周辺部に装入し、焼結
鉱と交互装入した。実施例２の場合、大塊高反応性コー
クスは通常コークスと混合して炉中心部に装入し、小塊
コークスは通常コークスおよび焼結鉱と！／２ずつ混合
して、炉中間Ｔから周辺部に装入した。In the case of Example 1, the charging method was such that a large lump of highly reactive coke was placed in the center, small lumps were charged from the middle part of the furnace to the peripheral part, and the small lumps were charged alternately with the sintered ore. In the case of Example 2, large highly reactive coke is mixed with normal coke and charged into the center of the furnace, and small coke is mixed with normal coke and sinter! /2 and charged into the periphery from the middle T of the furnace.
′：５１表の実施例では、比較例に比べてガス恥ｊ用率
の向上、コークス比の低下が達成され、燃料比を低ドす
ることができた。In the examples shown in Table ':51, an improvement in the gas utilization rate and a decrease in the coke ratio were achieved compared to the comparative example, and the fuel ratio could be lowered.
第
表
以上に説明したように、本発明においては、高強度の高
反応性コークスを大塊と小塊に分別し、大塊高反応性コ
ークスを炉中心部に、小塊高反応性コークスを炉中間部
より炉周辺部に装入することにより、炉中心部における
炉芯の通気ｉｉｌ！ｉ液性を確保し、また熱保存帯の温
度を低下させることができろため、シャフト効率を上げ
ることも可能となり、高炉全体の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。さら
に低燃料比時に発生しやすい焼結鉱還元粉化に伴う粉率
増加を抑制することにより長期間安定した操業が可能と
なる。As explained above in the table, in the present invention, high-strength, highly reactive coke is separated into large lumps and small lumps, and the large-sized highly reactive coke is placed in the center of the furnace, while the small-sized highly reactive coke is placed in the center of the furnace. By charging from the middle of the furnace to the periphery of the furnace, ventilation of the furnace core at the center of the furnace is achieved! Since it is possible to secure i-liquid properties and lower the temperature of the heat storage zone, it is also possible to increase the shaft efficiency, increasing the overall gas utilization efficiency of the blast furnace and operating the blast furnace with a low coke ratio. can. Furthermore, stable operation for a long period of time is possible by suppressing the increase in powder ratio due to reduction and powdering of sintered ore, which tends to occur at low fuel ratios.
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, the productivity of blast furnace operation can be improved.
第１図は焼結鉱ＲＤＩ、ＪＩＳ還元率と海水浸漬時間と
の関係を示した図である。
（発明の効果）
第１図
ＪＩＳ耕（２−）
湯べ凍Ａ咋鋸初FIG. 1 is a diagram showing the relationship between sintered ore RDI, JIS reduction rate, and seawater immersion time. (Effect of the invention) Figure 1 JIS cultivation (2-) Hot water bath freezing A Kui saw first
Claims (1)
いて、高反応性コークスを大塊と小塊に分別し、大塊高
反応性コークスを炉中心部に、小塊高反応性コークスを
炉中間部より炉周辺部に装入することを特徴とする高炉
操業法。 ２、高反応性コークスを大塊と小塊に分別し、大塊高反
応性コークスを炉中心部に、小塊高反応性コークスを炉
中間部より炉周辺部に装入するに際し、該高反応性コー
クスとともに低還元粉化性焼結鉱を装入することを特徴
とする高炉操業法。[Claims] 1. In a blast furnace in which coke is charged after being separated into large lumps and small lumps, the highly reactive coke is separated into large lumps and small lumps, and the large highly reactive coke is placed in the center of the furnace. A blast furnace operating method characterized by charging small highly reactive coke from the middle of the furnace to the periphery of the furnace. 2. Highly reactive coke is separated into large lumps and small lumps, and when charging the large highly reactive coke into the center of the furnace and the small highly reactive coke from the middle part of the furnace to the peripheral part of the furnace, A blast furnace operating method characterized by charging low-reduction pulverizable sintered ore together with reactive coke.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3957689A JP2769835B2 (en) | 1989-02-20 | 1989-02-20 | Blast furnace operation method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3957689A JP2769835B2 (en) | 1989-02-20 | 1989-02-20 | Blast furnace operation method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH02217408A true JPH02217408A (en) | 1990-08-30 |
| JP2769835B2 JP2769835B2 (en) | 1998-06-25 |
Family
ID=12556905
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3957689A Expired - Lifetime JP2769835B2 (en) | 1989-02-20 | 1989-02-20 | Blast furnace operation method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2769835B2 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2013088583A1 (en) * | 2011-12-13 | 2013-06-20 | Ｊｆｅスチール株式会社 | Process for manufacturing iron-source raw material to be fed into blast furnace |
| TWI464270B (en) * | 2011-12-22 | 2014-12-11 | Jfe Steel Corp | Manufacture method of iron source raw material for blast furnace |
-
1989
- 1989-02-20 JP JP3957689A patent/JP2769835B2/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2013088583A1 (en) * | 2011-12-13 | 2013-06-20 | Ｊｆｅスチール株式会社 | Process for manufacturing iron-source raw material to be fed into blast furnace |
| TWI464270B (en) * | 2011-12-22 | 2014-12-11 | Jfe Steel Corp | Manufacture method of iron source raw material for blast furnace |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2769835B2 (en) | 1998-06-25 |
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