JPH07278624A - Operation method to blow large amount of pulverized carbon to blast furnace - Google Patents
Operation method to blow large amount of pulverized carbon to blast furnaceInfo
- Publication number
- JPH07278624A JPH07278624A JP9287994A JP9287994A JPH07278624A JP H07278624 A JPH07278624 A JP H07278624A JP 9287994 A JP9287994 A JP 9287994A JP 9287994 A JP9287994 A JP 9287994A JP H07278624 A JPH07278624 A JP H07278624A
- Authority
- JP
- Japan
- Prior art keywords
- coke
- furnace
- reactivity
- blast furnace
- pulverized coal
- 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.)
- Withdrawn
Links
Landscapes
- Manufacture Of Iron (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、高炉の羽口部から微粉
炭を多量に吹込む際に、微粉炭燃焼時に発生する多量の
粉コークスの生成を抑制して高炉の通気性を確保し、生
産性を向上させ燃料比を低下させた高炉操業法に関す
る。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention secures the air permeability of a blast furnace by suppressing the generation of a large amount of pulverized coke generated during combustion of pulverized coal when a large amount of pulverized coal is blown from the tuyere of the blast furnace. , A blast furnace operating method with improved productivity and reduced fuel ratio.
【０００２】[0002]
【従来の技術】高炉操業にあっては、コークス代替とし
て、安価で燃焼性が良く発熱量の高い燃料（微粉炭、石
油、重油、ナフサ等）を羽口部より吹込み、溶銑製造コ
スト低減、生産性向上をはかってきており、特公昭４０
−２３７６３号公報にその技術が開示されている。とく
に直近では価格の点から微粉炭吹込みが主流となってお
り、燃料比低減（コスト低減）、生産性向上に大きく寄
与している。このようにして吹込まれた微粉炭は高炉内
で一部のコークスの代りに燃焼し、その燃焼性の良さと
高い発熱量のために、高温で多量の還元ガスを生成し効
率的な還元反応を行う。したがって炉頂より装入された
鉄鉱石はすばやく金属状態に還元されるとともに、溶融
して高温の溶銑となり、高炉の炉熱が高く生産性が向上
する。2. Description of the Related Art In blast furnace operation, as an alternative to coke, an inexpensive fuel with good combustibility and high calorific value (pulverized coal, petroleum, heavy oil, naphtha, etc.) is blown from the tuyere to reduce the hot metal production cost. , Is trying to improve productivity,
The technology is disclosed in Japanese Patent Publication No. 23763. In particular, in recent years, pulverized coal injection has become the mainstream in terms of price, which greatly contributes to fuel ratio reduction (cost reduction) and productivity improvement. The pulverized coal blown in this way burns in the blast furnace instead of a part of the coke, and due to its good combustibility and high calorific value, it produces a large amount of reducing gas at high temperature, resulting in an efficient reduction reaction. I do. Therefore, the iron ore charged from the furnace top is quickly reduced to a metal state and is melted to form high-temperature hot metal, and the furnace heat of the blast furnace is high and the productivity is improved.
【０００３】[0003]
【発明が解決しようとする課題】ところで従来の高炉操
業において、微粉炭を多量に吹込むと、吹込んだ微粉炭
全量が燃焼せずに一部未燃チャーが発生する。この未燃
チャーは上昇ガス流に乗って炉頂より排出されるため、
微粉炭のコークスに対する置換率が低下し、燃料比上
昇、生産量低下を引き起こす。またこの未燃チャーが高
炉炉下部中心のコークス層（炉芯と称する）に捕捉され
るため、この部分を流下する溶銑滓の通液性を阻害し、
ひいてはこの部分のガスの通気性を阻害することにな
り、高炉の生産性はさらに低下する。By the way, in the conventional blast furnace operation, when a large amount of pulverized coal is blown, the whole amount of the pulverized coal blown does not burn and some unburned char is generated. This unburned char is discharged from the top of the furnace by riding the rising gas flow.
The replacement rate of pulverized coal for coke decreases, causing an increase in fuel ratio and a decrease in production. In addition, since this unburned char is trapped in the coke layer at the center of the lower part of the blast furnace (called the core), it impedes the liquid permeability of the molten pig iron flowing down this part,
Eventually, the gas permeability of this portion will be impaired, and the productivity of the blast furnace will further decrease.
【０００４】このため、微粉炭の吹込み量には上限が存
在し、次に示す過剰酸素率を１．０以上に維持してい
る。 （過剰酸素率）＝（羽口部より吹込まれる空気、純酸
素、微粉炭中の酸素量）／（微粉炭中炭素、水素をＣＯ
2 ，Ｈ2 Ｏまで燃焼するのに必要な酸素量） 過剰酸素率が１．０以上の場合は微粉炭中の炭素、水素
が全量（１），（２）式の反応により Ｃ＋Ｏ2 ＝ＣＯ2 ・・・（１） ２Ｈ＋１／２Ｏ2 ＝Ｈ2 Ｏ ・・・（２） ＣＯ2 ＋Ｃ＝２ＣＯ ・・・（３） Ｈ2 Ｏ＋Ｃ＝Ｈ2 ＋ＣＯ ・・・（４） ＣＯ2 ，Ｈ2 Ｏとなり、これが全量レースウェイ内のコ
ークスと（３），（４）式の反応によりＣＯ，Ｈ2 とな
るため、未燃チャーは発生しない。ところが過剰酸素率
が１．０未満の場合は全量がＣＯ2 ，Ｈ2 Ｏにならず、
一部Ｃ（未燃チャー）が生成する。この未燃チャーが前
述したように、置換率低下、通気不良の原因となる。Therefore, there is an upper limit to the amount of pulverized coal blown in, and the excess oxygen ratio shown below is maintained at 1.0 or more. (Excess oxygen rate) = (air blown from tuyere, pure oxygen, amount of oxygen in pulverized coal) / (carbon in pulverized coal, hydrogen CO
2 , the amount of oxygen required to burn up to H 2 O) When the excess oxygen ratio is 1.0 or more, the total amount of carbon and hydrogen in the pulverized coal is C + O 2 = CO due to the reaction of equations (1) and (2) 2 ··· (1) 2H + 1 / 2O 2 = H 2 O ··· (2) CO 2 + C = 2CO ··· (3) H 2 O + C = H 2 + CO ··· (4) CO 2, H 2 O becomes O, which becomes CO and H 2 due to the reaction of coke in the raceway with the equations (3) and (4), so that unburned char is not generated. However, when the excess oxygen ratio is less than 1.0, the total amount does not become CO 2 and H 2 O,
Part C (unburned char) is generated. As described above, this unburned char causes a decrease in the replacement rate and poor ventilation.
【０００５】過剰酸素率が１．０のときの微粉炭吹込み
量は１７０ｋｇ／ｔ（高炉の燃料比が５００ｋｇ／ｔの
とき）であり、この量が微粉炭吹込み限界である。この
ように過剰酸素率１．０（微粉炭吹込み量１７０ｋｇ／
ｔ）の条件下では、未燃チャーが発生しない。ところが
コークスは（１）式の反応による消費がなく、微粉炭燃
焼（（１），（２）式の反応）によって生成したＣＯ
2 ，Ｈ2 Ｏとの反応（（３），（４）式）による消費だ
けであるから、消費速度が遅い。すなわちコークスのレ
ースウェイ内での旋回滞留時間が長くなり、旋回摩耗に
よる粉コークス発生量が増加する。また発生した粉コー
クスは一般的に反応性が低いから、反応による消費速度
が遅く、炉芯に捕捉されるため、この部分を流下する溶
銑滓の通液性を阻害し、ひいてはこの部分のガスの通気
性を阻害することになり、未燃チャーの影響はないもの
の、粉コークスによって高炉の生産量は低下する。When the excess oxygen ratio is 1.0, the pulverized coal injection amount is 170 kg / t (when the blast furnace fuel ratio is 500 kg / t), and this amount is the pulverized coal injection limit. In this way, the excess oxygen ratio was 1.0 (powder of pulverized coal 170 kg /
Under the condition of t), unburned char is not generated. However, coke is not consumed by the reaction of the formula (1), and is generated by combustion of pulverized coal (reaction of the formulas (1) and (2)).
The consumption rate is slow because it is only consumed by the reaction with 2 , H 2 O (equations (3) and (4)). That is, the turning residence time of the coke in the raceway becomes long, and the amount of powder coke generated due to turning wear increases. In addition, since the generated coke generally has low reactivity, the consumption rate due to the reaction is slow and it is trapped in the furnace core, which impedes the liquid permeability of the molten pig iron flowing down this portion, and thus the gas in this portion. Although it does not affect unburned char, the coke dust reduces the blast furnace production.
【０００６】したがってこの粉コークスの発生を抑制す
るために、微粉炭吹込み量を１７０ｋｇ／ｔよりも低く
抑えざるを得ず、燃料比低下、生産性向上には限界があ
った。また微粉炭吹込み量を１７０ｋｇ／ｔに維持する
ために、コークス強度を向上させる対策を取らざるを得
ず、コークス製造コストが上昇していた。そこで本発明
は、微粉炭吹込み量を１７０ｋｇ／ｔとしても、コーク
ス強度を向上させることなく、レースウェイ内での旋回
摩耗による粉コークス発生量の増加を抑制し、生産量、
燃料比を維持することを目的とする。Therefore, in order to suppress the generation of the powder coke, the amount of pulverized coal injected must be suppressed to be lower than 170 kg / t, and there is a limit to the reduction of the fuel ratio and the improvement of productivity. Further, in order to maintain the amount of pulverized coal blown at 170 kg / t, there has been no choice but to take measures to improve the coke strength, resulting in an increase in coke production cost. Therefore, the present invention suppresses the increase in the amount of pulverized coke generated by the turning wear in the raceway without increasing the coke strength even when the amount of pulverized coal injected is 170 kg / t, and
The purpose is to maintain the fuel ratio.
【０００７】[0007]
【課題を解決するための手段】本発明の、高炉における
微粉炭多量吹込み操業方法は、その目的を達成するため
に、羽口部から微粉炭を高炉の内部に吹込む操業法にお
いて、ＪＩＳ反応性が３５〜５０％の高反応性コークス
を炉周辺部に５０〜１５０ｋｇ／ｔ−ｐｉｇ装入するこ
とを特徴とする。またＪＩＳ反応性が３５〜５０％以上
の高反応性コークスの１０〜３０％を、ＪＩＳ反応性が
４０〜８０％の小塊高反応性コークスに置換し、該小塊
高反応性コークスを鉄鉱石と重量比で１：５〜１：１０
の割合であらかじめ混合して、炉周辺部に１００〜２０
０ｋｇ／ｔ−ｐｉｇ装入することを特徴とする。In order to achieve the object, the operation method for blowing a large amount of pulverized coal in a blast furnace according to the present invention is based on the JIS method in which the pulverized coal is blown from the tuyere into the blast furnace. It is characterized in that 50-150 kg / t-pig of highly reactive coke having a reactivity of 35-50% is charged in the peripheral portion of the furnace. Further, 10 to 30% of the highly reactive coke having a JIS reactivity of 35 to 50% or more is replaced with a small lump highly reactive coke having a JIS reactivity of 40 to 80%, and the small lump highly reactive coke is replaced with iron ore. Stone to weight ratio of 1: 5 to 1:10
Mix in advance at a ratio of 100 to 20 around the furnace.
It is characterized by charging 0 kg / t-pig.
【０００８】[0008]
【作用】本発明において、高炉の炉周辺部とは、相対炉
口半径で０．７０〜１．００の領域と定義する。本発明
で使用する高反応性コークスは、ＪＩＳ Ｋ ２１５１
−１９７７の反応性試験方法で測定したときのＪＩＳ反
応性が３５〜５０％であることが必要である。In the present invention, the peripheral portion of the blast furnace is defined as a region having a relative throat radius of 0.70 to 1.00. The highly reactive coke used in the present invention is JIS K 2151.
It is necessary that the JIS reactivity is 35 to 50% when measured by the reactivity test method of -1977.
【０００９】また本発明で使用する小塊高反応性コーク
スは、その平均粒度が１０〜２５ｍｍのものと定義す
る。そして、ＪＩＳ Ｋ ２１５１−１９７７の反応性
試験方法で測定したときのＪＩＳ反応性が４０〜８０％
であることが必要である。これに対して、従来法で使用
する通常コークス、本発明で使用するＪＩＳ反応性が３
５〜５０％の高反応性コークスは、平均粒度が３０〜１
５０ｍｍであり、大塊と呼んで区別する。The small lump highly reactive coke used in the present invention is defined as having an average particle size of 10 to 25 mm. And, the JIS reactivity when measured by the reactivity test method of JIS K 2151-1977 is 40 to 80%.
It is necessary to be. On the other hand, the normal coke used in the conventional method and the JIS reactivity used in the present invention are 3
Highly reactive coke of 5 to 50% has an average particle size of 30 to 1
It is 50 mm and is called a large block for distinction.
【００１０】小塊高反応性コークスの平均粒度を１０〜
２５ｍｍと数値限定した理由は、１０ｍｍ未満だと高炉
の通気性を阻害して安定的に使用できないし、２５ｍｍ
を越えると後述する大塊高反応性コークスに対する優先
的消費がなされない。また大塊コークス（通常コーク
ス、高反応性コークス）の平均粒度を３０〜１５０ｍｍ
と数値限定した理由は、３０ｍｍ未満だと高炉の通気性
を阻害して安定的に使用できないし、１５０ｍｍを越え
ると、大きすぎてコークス輸送、高炉炉頂装入装置に対
する支障が出て使用できない。The average particle size of the small lump highly reactive coke is 10 to 10.
The reason for limiting the numerical value to 25 mm is that if it is less than 10 mm, the air permeability of the blast furnace is impaired and stable use is impossible.
If it exceeds, the preferential consumption of large-sized highly reactive coke, which will be described later, is not performed. Also, the average particle size of large coke (normal coke, highly reactive coke) is 30 to 150 mm.
The reason for limiting the numerical value is that if it is less than 30 mm, it cannot be used stably because it impairs the air permeability of the blast furnace, and if it exceeds 150 mm, it is too large and cannot be used because it interferes with coke transportation and the blast furnace top charging device. .
【００１１】ＪＩＳ反応性が３５〜５０％の高反応性コ
ークスを炉周辺部に装入すると、この炉周辺部に装入さ
れたコークスの大部分がレースウェイに降下してきて、
旋回滞留するが、反応性が高いため、旋回摩耗により発
生した粉コークスが（３），（４）式の反応により消費
され、炉芯に捕捉されることがないため、この部分を流
下する溶銑滓の通液性阻害、ひいてはこの部分のガスの
通気性阻害が抑制される。When a highly reactive coke having a JIS reactivity of 35 to 50% is charged in the peripheral area of the furnace, most of the coke charged in the peripheral area of the furnace descends to the raceway,
Although swirling and staying, since the reactivity is high, the powder coke generated by swirling wear is consumed by the reactions of equations (3) and (4) and is not captured by the furnace core. The obstruction of the liquid permeability of the slag, and consequently the obstruction of the gas permeability of this portion, are suppressed.
【００１２】ＪＩＳ反応性が３５％未満だと、（３），
（４）式の反応による消費速度が遅く、炉芯に捕捉され
るため、通気性・通液性が阻害されてしまう。ＪＩＳ反
応性が５０％を越えると、コークス製造プロセス上強度
が維持できず、高炉に装入される前に粉化してしまう。
ＪＩＳ反応性が３５〜５０％の高反応性コークスを炉周
辺部に装入する理由は、これ以外の領域に装入したとき
には、レースウェイに降下してくる割合が少ないためで
ある。If the JIS reactivity is less than 35%, (3),
The consumption rate by the reaction of the equation (4) is slow and the gas is trapped in the furnace core, which impairs air permeability and liquid permeability. If the JIS reactivity exceeds 50%, the strength cannot be maintained due to the coke manufacturing process, and the powder will be pulverized before being charged into the blast furnace.
The reason why highly reactive coke having a JIS reactivity of 35 to 50% is charged in the peripheral portion of the furnace is that when it is charged in a region other than this, the ratio of falling into the raceway is small.
【００１３】ＪＩＳ反応性が３５〜５０％の高反応性コ
ークスは、高炉シャフト部でも反応性が高いから、高炉
シャフト部でＣＯ2 がコークス表面に接触して（３）式
の反応がより低温から活発に行われ、その結果として炉
内に生じたＣＯ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。（３）式
の反応は吸熱反応であり、高炉における熱保存帯温度を
低下させることができる。通常のコークスを使用したと
きは、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、熱保存帯温度を９００〜９５０℃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、還
元効率が向上しコークス比を低下させることができる。The highly reactive coke having a JIS reactivity of 35 to 50% has high reactivity even in the shaft portion of the blast furnace, so that CO 2 comes into contact with the surface of the coke in the shaft portion of the blast furnace, and the reaction of the formula (3) is performed at a lower temperature. Actively, and as a result, the CO gas generated in the furnace effectively reacts with the iron ore to reduce it to the lower oxide or metal state. The reaction of the formula (3) is an endothermic reaction and can lower the heat preservation zone temperature in the blast furnace. When normal coke is used, a heat storage zone of about 1000 ° C is generated and its value hardly changes, whereas by using highly reactive coke, the heat storage zone temperature is set to 900 to 950 ° C. It is possible to lower it. As a result, the reduction equilibrium point can be afforded, so that the reduction progresses further, the reduction efficiency is improved, and the coke ratio can be reduced.
【００１４】炉周辺部に装入するＪＩＳ反応性が３５〜
５０％の高反応性コークスの装入量を５０〜１５０ｋｇ
／ｔ−ｐｉｇに数値限定した理由は、５０ｋｇ／ｔ−ｐ
ｉｇ未満だとレースウェイに降下してきたときに通常コ
ークスの割合が多いため、旋回摩耗により発生した粉コ
ークスが（３），（４）式の反応により消費されない。
また１５０ｋｇ／ｔ−ｐｉｇを越えると高炉シャフト部
で発生する粉コークスの量が多くなり、高炉の通気性を
阻害する。ただし、この（３）式の反応が活発に行われ
ると、高炉シャフト部で粉コークスが発生し、通常は発
生量が少ないから高炉の通気性を阻害しないが、もし通
気性阻害徴候が見えるときは、ＪＩＳ反応性が３５〜５
０％の大塊高反応性コークスの１０〜３０％を、ＪＩＳ
反応性が４０〜８０％の小塊高反応性コークスに置換
し、該小塊高反応性コークスを鉄鉱石と重量比で１：５
〜１：１０の割合であらかじめ混合して、炉周辺部に１
００〜２００ｋｇ／ｔ−ｐｉｇ装入することで、粉コー
クス発生を抑制できる。The JIS reactivity charged in the peripheral area of the furnace is 35-35.
50-150 kg of 50% highly reactive coke charge
The reason for limiting the value to / t-pig is 50 kg / t-p.
If it is less than ig, the proportion of normal coke when descending to the raceway is large, so the powder coke generated due to turning wear is not consumed by the reactions of equations (3) and (4).
Further, if it exceeds 150 kg / t-pig, the amount of powder coke generated in the shaft portion of the blast furnace increases, which impairs the air permeability of the blast furnace. However, when the reaction of this equation (3) is actively carried out, powder coke is generated in the shaft part of the blast furnace, and the amount is usually small, so it does not hinder the air permeability of the blast furnace, but if signs of gas permeability are visible. Has a JIS reactivity of 35-5
0 to 30% of highly reactive coke with large mass
The small lump highly reactive coke having a reactivity of 40 to 80% was substituted, and the small lump highly reactive coke was mixed with iron ore in a weight ratio of 1: 5.
Pre-mix at a ratio of ~ 1:10 to 1
It is possible to suppress the generation of powder coke by charging from 00 to 200 kg / t-pig.
【００１５】小塊高反応性コークスは炉周辺部に装入し
たＪＩＳ反応性が３５〜５０％の大塊高反応性コークス
よりも、反応性が高いから、（３）式の反応がより活発
に行われ、大塊の反応を抑制し、大塊からの粉コークス
発生を減少させる。小塊高反応性コークスの反応により
発生した粉コークスの反応性は高いから、反応により消
費され高炉炉頂から排出されたり、炉内に蓄積すること
はない。小塊高反応性コークスのＪＩＳ反応性が４０％
未満だと、前述した大塊高反応性コークスに対する優先
的消費がなされない。またＪＩＳ反応性が８０％を越え
ると、コークス製造プロセス上強度が維持できず、高炉
に装入される前に粉化してしまう。The high reactivity of small lumps is higher than the high reactivity of large lumps of JIS with a reactivity of 35 to 50% charged in the peripheral portion of the furnace. Therefore, the reaction of the formula (3) is more active. And suppresses the reaction of large lumps and reduces the generation of coke from the large lumps. Since the coke powder generated by the reaction of the small lump highly reactive coke has high reactivity, it is not consumed by the reaction and discharged from the top of the blast furnace or accumulated in the furnace. JIS reactivity of small high reactivity coke is 40%
If it is less than the above, preferential consumption for the above-mentioned large-volume highly reactive coke is not made. On the other hand, if the JIS reactivity exceeds 80%, the strength cannot be maintained in the coke manufacturing process and the powder is pulverized before being charged into the blast furnace.
【００１６】大塊高反応性コークスと置換する小塊高反
応性コークスの量を１０〜３０％に数値限定した理由
は、１０％未満だと量が少なすぎて前述した大塊高反応
性コークスに対する優先的消費がなされない。３０％を
越えると小塊高反応性コークスの反応により発生した粉
コークスの量が多くなり過ぎて、反応性が高いというも
のの消費が追いつかず、高炉炉頂から排出されたり、炉
内に蓄積して高炉の通気性を阻害する。また小塊高反応
性コークスを鉄鉱石とあらかじめ混合することにより、
還元がより進行することになり、還元効率が向上しコー
クス比を低下させることができる。The reason why the amount of the small lump highly reactive coke to be replaced with the large lump highly reactive coke is numerically limited to 10 to 30% is because the amount is too small when it is less than 10%, and the large lump highly reactive coke described above is used. Priority consumption is not made. If it exceeds 30%, the amount of powder coke generated by the reaction of small lump highly reactive coke becomes too large, and although the reactivity is high, consumption cannot keep up and is discharged from the top of the blast furnace or accumulated in the furnace. Impairs the air permeability of the blast furnace. Also, by premixing the small highly reactive coke with iron ore,
The reduction proceeds further, the reduction efficiency is improved, and the coke ratio can be reduced.
【００１７】鉄鉱石とあらかじめ混合する小塊高反応性
コークスの混合率を重量比で１：５〜１：１０と数値限
定した理由は、１：１０よりも混合率が少ないと還元進
行度合が悪く、前述した大塊高反応性コークスに対する
優先的消費がなされない。１：５よりも混合率が多いと
鉄鉱石との混合度合が悪くなり、還元進行度合が悪く、
前述した大塊高反応性コークスに対する優先的消費がな
されない。The reason why the mixing ratio of the small highly reactive coke premixed with the iron ore is numerically limited to 1: 5 to 1:10 by weight is that the reduction progress rate is lower when the mixing ratio is smaller than 1:10. Unfortunately, it does not make the preferential consumption of the above-mentioned large mass highly reactive coke. If the mixing ratio is more than 1: 5, the degree of mixing with the iron ore becomes poor and the degree of reduction progress becomes poor.
There is no preferential consumption for the high mass highly reactive coke described above.
【００１８】また鉄鉱石とあらかじめ混合した小塊高反
応性コークスの炉周辺部への装入量を１００〜２００ｋ
ｇ／ｔ−ｐｉｇと数値限定した理由は、１００ｋｇ／ｔ
−ｐｉｇ未満だと、量が少なすぎて前述した大塊高反応
性コークスに対する優先的消費がなされない。２００ｋ
ｇ／ｔ−ｐｉｇを越えると炉周辺部に装入する鉄鉱石の
量が多くなりすぎて、高炉の周辺部における通気性を阻
害する。このようにして反応を抑制されたＪＩＳ反応性
が３５〜５０％の大塊高反応性コークスが、レースウェ
イに降下してきて、旋回摩耗により発生した粉コークス
は反応性が高いから、（３），（４）式の反応により消
費され、炉芯に捕捉されることがない。Further, the charging amount of the small lump highly reactive coke premixed with the iron ore into the furnace peripheral portion is 100 to 200 k.
The reason for limiting the value to g / t-pig is 100 kg / t
If it is less than -pig, the amount is too small to preferentially consume the above-described large block highly reactive coke. 200k
If it exceeds g / t-pig, the amount of iron ore charged in the peripheral portion of the furnace becomes too large, which impairs air permeability in the peripheral portion of the blast furnace. The highly reactive coke having a JIS reactivity of 35 to 50% whose reaction is suppressed in this way descends to the raceway, and the powder coke generated by the turning wear is highly reactive. , (4) is consumed by the reaction and is not captured by the furnace core.
【００１９】[0019]
【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。表１に操業結果を示す。EXAMPLES The features of the present invention will be specifically described with reference to the following examples. Table 1 shows the operation results.
【００２０】[0020]
【表１】 [Table 1]
【００２１】（実施例１）ＪＩＳ反応性が２３％の通常
冶金用コークスを使用し、微粉炭吹込み量１４０ｋｇ／
ｔ−ｐｉｇ（コークス全装入量３６０ｋｇ／ｔ−ｐｉ
ｇ）で操業していた状態から、微粉炭吹込み量を１７０
ｋｇ／ｔ−ｐｉｇに上昇し（コークス全装入量を３３０
ｋｇ／ｔ−ｐｉｇに低下）、かつＪＩＳ反応性が３６％
の高反応性コークスを、ＪＩＳ反応性が２３％の通常冶
金用コークスと４１％置換して（コークス装入量１３５
ｋｇ／ｔ−ｐｉｇ）、炉周辺部（相対炉口半径で０．７
０〜０．９５の領域）に装入した操業例である。後述す
る比較例１に対比すると、微粉炭吹込み量が多く、高炉
の通気性を示す送風圧力が低く、出銑量が多く、燃料比
が低くなっている。(Example 1) A standard metallurgical coke having a JIS reactivity of 23% was used, and a pulverized coal injection rate of 140 kg /
t-pig (coke total charge 360 kg / t-pi
From the state that was operating in g), set the pulverized coal injection amount to 170
increased to kg / t-pig (total coke charge was 330
kg / t-pig) and JIS reactivity is 36%
The high-reactivity coke was replaced by 41% with conventional metallurgical coke having a JIS reactivity of 23% (a coke charging amount of 135%).
kg / t-pig), peripheral area of the furnace (0.7 in relative furnace radius)
This is an example of the operation charged into the area of 0 to 0.95). In comparison with Comparative Example 1 described later, the amount of pulverized coal injected was large, the blast pressure indicating the air permeability of the blast furnace was low, the amount of tapping was large, and the fuel ratio was low.
【００２２】（実施例２）ＪＩＳ反応性が２３％の通常
冶金用コークスを使用し、微粉炭吹込み量１４０ｋｇ／
ｔ−ｐｉｇ（コ−クス全装入量３６０ｋｇ／ｔ−ｐｉ
ｇ）で操業していた状態から、微粉炭吹込み量を１８０
ｋｇ／ｔ−ｐｉｇに上昇し（コークス全装入量を３２０
ｋｇ／ｔ−ｐｉｇに低下）、かつＪＩＳ反応性が４０％
の高反応性コークスを、ＪＩＳ反応性が２３％の通常冶
金用コークスと３６％置換して（コークス装入量１１５
ｋｇ／ｔ−ｐｉｇ）、炉周辺部（相対炉口半径で０．８
０〜１．００の領域）に装入し、さらにＪＩＳ反応性が
４０％の高反応性コークス（大塊）の２１％（コークス
装入量２５ｋｇ／ｔ−ｐｉｇ）を、ＪＩＳ反応性が５５
％の小塊高反応性コークスに置換し、該小塊高反応性コ
ークスを鉄鉱石とあらかじめ１：６の混合率で混合し
て、炉周辺部（相対炉口半径で０．７５〜０．９５の領
域）に１７５ｋｋｇ／ｔ−ｐｉｇ装入した操業例であ
る。後述する比較例２に対比すると、微粉炭吹込み量が
多く、高炉の通気性を示す送風圧力が低く、出銑量が多
く、燃料比が低くなっている。(Example 2) A standard metallurgical coke having a JIS reactivity of 23% was used, and a pulverized coal injection rate of 140 kg /
t-pig (Coke total charging amount 360 kg / t-pi
From the state that was operating in g), set the pulverized coal injection amount to 180
increased to kg / t-pig (total coke charge was 320
kg / t-pig) and JIS reactivity is 40%
The high-reactivity coke was replaced with normal metallurgical coke having a JIS reactivity of 23% by 36% (a coke charging amount of 115%).
kg / t-pig), peripheral area of furnace (relative furnace opening radius is 0.8)
0 to 1.00), and 21% of the highly reactive coke (large lump) having a JIS reactivity of 40% (coke charging amount 25 kg / t-pig) and a JIS reactivity of 55%.
% Small lump highly reactive coke, and the small lump highly reactive coke was mixed with iron ore at a mixing ratio of 1: 6 in advance, and the peripheral portion of the furnace (0.75 to 0. This is an example of operation in which 175 kg / t-pig is charged into the area (95). Compared with Comparative Example 2 described later, the amount of pulverized coal injected was large, the blast pressure indicating the air permeability of the blast furnace was low, the amount of tapping was large, and the fuel ratio was low.
【００２３】（比較例１）ＪＩＳ反応性が２３％の通常
冶金用コークスを使用し、微粉炭吹込み量１４０ｋｇ／
ｔ−ｐｉｇて操業していた状態から、微粉炭吹込み量を
１７０ｋｇ／ｔ−ｐｉｇに上昇し、そのまま操業を継続
した従来法による操業例である。実施例１に対比する
と、微粉炭吹込み量が少なく、送風圧力が高く、出銑量
が少なく、燃料比が高い。(Comparative Example 1) A standard metallurgical coke having a JIS reactivity of 23% was used, and a pulverized coal injection rate of 140 kg /
This is an example of operation by the conventional method in which the pulverized coal injection rate was increased to 170 kg / t-pig from the state in which the operation was performed at t-pig, and the operation was continued as it was. Compared with Example 1, the amount of pulverized coal blown is small, the blast pressure is high, the amount of tapping is small, and the fuel ratio is high.
【００２４】（比較例２）ＪＩＳ反応性が２３％の通常
冶金用コークスを使用し、微粉炭吹込み量１４０ｋｇ／
ｔ−ｐｉｇで操業していた状態から、微粉炭吹込み量を
１８０ｋｇｔ−ｐｉｇに上昇し、かつコークスの冷間強
度（ＤＩ）を１％向上させてそのまま操業を継続した従
来法による操業例である。実施例２に対比すると、微粉
炭吹込み量はほぼ同じであるが、送風圧力が高く、出銑
量が少なく、燃料比が高い。またコークスの製造価格が
高い。(Comparative Example 2) A standard metallurgical coke having a JIS reactivity of 23% was used, and a pulverized coal injection rate of 140 kg /
From the state of operating at t-pig, the pulverized coal injection amount was increased to 180 kg t-pig, the cold strength (DI) of coke was improved by 1%, and the operation was continued as it is. is there. Compared to Example 2, the amount of pulverized coal injected is almost the same, but the blast pressure is high, the amount of tapping is small, and the fuel ratio is high. In addition, the manufacturing cost of coke is high.
【００２５】[0025]
【発明の効果】以上説明したように、本発明において
は、微粉炭多量吹込み時に、大塊高反応性コークスを炉
周辺部に装入することにより、またさらに、小塊高反応
性コークスを鉄鉱石とあらかじめ混合して炉周辺部に装
入することにより、レースウェイ内での旋回摩耗による
粉コークスの発生を抑制することができるため、微粉炭
吹込み量１７０ｋｇ／ｔとしても、コークス強度を向上
させることなく、生産量、燃料比を維持ことができる。As described above, in the present invention, when a large amount of pulverized coal is blown, the large lump highly reactive coke is charged into the peripheral portion of the furnace, and further, the small lump highly reactive coke is further added. By premixing with iron ore and charging it into the peripheral area of the furnace, it is possible to suppress the generation of powder coke due to turning wear in the raceway, so even if the pulverized coal injection rate is 170 kg / t, the coke strength is high. The production amount and the fuel ratio can be maintained without improving the fuel consumption.
Claims (2)
操業法において、ＪＩＳ反応性が３５〜５０％の高反応
性コークスを炉周辺部に５０〜１５０ｋｇ／ｔ−ｐｉｇ
装入することを特徴とする高炉における微粉炭多量吹込
み操業方法。1. A method of blowing pulverized coal into the interior of a blast furnace from a tuyere, in which a highly reactive coke having a JIS reactivity of 35 to 50% is provided in the periphery of the furnace at 50 to 150 kg / t-pig.
A method for injecting a large amount of pulverized coal in a blast furnace, which is characterized by charging.
応性コークスの１０〜３０％を、ＪＩＳ反応性が４０〜
８０％の小塊高反応性コークスに置換し、該小塊高反応
性コークスを鉄鉱石と重量比で１：５〜１：１０の割合
であらかじめ混合して、炉周辺部に１００〜２００ｋｇ
／ｔ−ｐｉｇ装入することを特徴とする請求項１記載の
高炉における微粉炭多量吹込み操業方法。2. A high reactivity coke having a JIS reactivity of 35 to 50% or more, 10 to 30%, and a JIS reactivity of 40 to
80% small lump high reactivity coke was replaced, and the small lump high reactivity coke was pre-mixed with iron ore in a weight ratio of 1: 5 to 1:10, and 100 to 200 kg around the furnace.
/ T-pig charging. The method for operating a large amount of pulverized coal injection in a blast furnace according to claim 1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9287994A JPH07278624A (en) | 1994-04-07 | 1994-04-07 | Operation method to blow large amount of pulverized carbon to blast furnace |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9287994A JPH07278624A (en) | 1994-04-07 | 1994-04-07 | Operation method to blow large amount of pulverized carbon to blast furnace |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH07278624A true JPH07278624A (en) | 1995-10-24 |
Family
ID=14066742
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP9287994A Withdrawn JPH07278624A (en) | 1994-04-07 | 1994-04-07 | Operation method to blow large amount of pulverized carbon to blast furnace |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH07278624A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006206982A (en) * | 2005-01-31 | 2006-08-10 | Jfe Steel Kk | Method of operating blast furnace |
| JP2008089302A (en) * | 1996-08-27 | 2008-04-17 | Hitachi Metals Ltd | Combustion control method for rotary melting furnace |
| KR101510546B1 (en) * | 2013-10-30 | 2015-04-08 | 주식회사 포스코 | Method for charging materials into blast furnace |
-
1994
- 1994-04-07 JP JP9287994A patent/JPH07278624A/en not_active Withdrawn
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008089302A (en) * | 1996-08-27 | 2008-04-17 | Hitachi Metals Ltd | Combustion control method for rotary melting furnace |
| JP2006206982A (en) * | 2005-01-31 | 2006-08-10 | Jfe Steel Kk | Method of operating blast furnace |
| KR101510546B1 (en) * | 2013-10-30 | 2015-04-08 | 주식회사 포스코 | Method for charging materials into blast furnace |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US5632953A (en) | Process and device for melting iron metallurgical materials in a coke-fired cupola | |
| JPH07278624A (en) | Operation method to blow large amount of pulverized carbon to blast furnace | |
| US5084093A (en) | Method for manufacturing molten pig iron | |
| JPS61221322A (en) | Melting and refining method for metallic raw material | |
| JP4325401B2 (en) | Manufacturing method of low silicon hot metal | |
| JP2983087B2 (en) | Operation method of smelting reduction | |
| JP7416043B2 (en) | Molten iron refining method | |
| JP3516793B2 (en) | How to load raw fuel such as dust agglomerate, self-reducing ore, iron scrap, solid fuel, etc. into vertical furnace | |
| JP2666396B2 (en) | Hot metal production method | |
| WO1997012066A1 (en) | Chromium ore smelting reduction process | |
| JP2560669B2 (en) | Method of manufacturing hot metal | |
| JPH0524961B2 (en) | ||
| JPH0723502B2 (en) | Hot metal manufacturing method | |
| JP2837282B2 (en) | Production method of chromium-containing hot metal | |
| JP2817245B2 (en) | Pig iron production method | |
| JP4325128B2 (en) | Low silicon operation method in blast furnace mass injection into blast furnace. | |
| JP2666397B2 (en) | Hot metal production method | |
| JP2530932Y2 (en) | Cylindrical furnace pulverized coal injection nozzle | |
| JPH0723503B2 (en) | Hot metal manufacturing method | |
| JPS6184311A (en) | Method for heating molten iron by secondary combustion method | |
| JP3523720B2 (en) | Scrap melting method | |
| JPH01195211A (en) | Method for melting and reducing iron oxide | |
| JP2666385B2 (en) | Hot metal production method | |
| JPH04268001A (en) | Method for operating blast furnace | |
| JPH02282410A (en) | Smelting reduction method for ore |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A300 | Withdrawal of application because of no request for examination |
Free format text: JAPANESE INTERMEDIATE CODE: A300 Effective date: 20010703 |