JP2008240044A - Blast furnace blowing pulverized coal, blast furnace blowing pulverized coal manufacturing method, and pulverized coal blowing blast furnace operating method - Google Patents
Blast furnace blowing pulverized coal, blast furnace blowing pulverized coal manufacturing method, and pulverized coal blowing blast furnace operating method Download PDFInfo
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Abstract
【課題】揮発分含有量の低い石炭を、高炉吹き込み用微粉炭として使用し、さらに、該微粉炭を使用する際に、微粉炭の性状を踏まえ、炉内における燃焼率を高める。
【解決手段】炭材を粉砕し高炉吹込み用微粉炭を製造する方法において、該炭材を、粒径（２０±ｚ）μｍ以下の微粉炭の質量割合α（％）が、下記式を満たすように粉砕する。
α≧β−γ・ＶＭ
ここで、β：設定した評価基準の燃焼率で定まる定数、γ：設定した評価基準の燃焼率で定まる係数、ＶＭ：高炉吹込み微粉炭中の揮発分の平均含有量（％）である。
【選択図】図１[PROBLEMS] To use coal having a low volatile content as pulverized coal for blast furnace blowing, and to further increase the combustion rate in the furnace based on the properties of pulverized coal when the pulverized coal is used.
In a method of pulverizing a carbon material and producing pulverized coal for blast furnace injection, the mass ratio α (%) of the pulverized coal having a particle size (20 ± z) μm or less is expressed by the following formula. Grind to fill.
α ≧ β-γ · VM
Here, β is a constant determined by the combustion rate of the set evaluation standard, γ is a coefficient determined by the combustion rate of the set evaluation standard, and VM is an average content (%) of volatile components in the blast furnace-injected pulverized coal.
[Selection] Figure 1
Description
本発明は、高炉吹込み用微粉炭製造用の炭材を、揮発分に応じて、適切な粒度に粉砕して高炉吹込み用微粉炭を製造する製造方法、及び、該微粉炭を高炉に吹き込む高炉操業方法に関するものである。 The present invention relates to a production method for producing pulverized coal for blast furnace injection by pulverizing a carbonaceous material for producing pulverized coal for blast furnace injection to an appropriate particle size according to the volatile matter, and the pulverized coal as a blast furnace. It relates to the blast furnace operation method.
近年、高炉への粉体吹き込み操業技術の一つとして、微粉炭吹き込み操業技術が確立されるに至り、高炉でのコークス比は大幅に低減されている。そして、微粉炭吹き込み量が１２０ｋｇ／ｔを超える高炉操業も指向されるようになっている。 In recent years, pulverized coal injection operation technology has been established as one of powder injection operation technologies for blast furnaces, and the coke ratio in blast furnaces has been greatly reduced. And blast furnace operation in which the amount of pulverized coal injection exceeds 120 kg / t is also directed.
しかし、大量の微粉炭を吹き込む高炉操業において、操業を安定して継続実施するためには、吹き込んだ微粉炭を炉内で完全に燃焼させる必要がある。吹き込んだ微粉炭が未燃焼のままの状態で炉内に滞留すると、炉下部や炉芯部に、未燃焼の微粉炭が“チャー”として蓄積し、炉内の通気性及び通液性を阻害する。 However, in the blast furnace operation in which a large amount of pulverized coal is blown, in order to stably carry out the operation, it is necessary to completely burn the blown pulverized coal in the furnace. If the injected pulverized coal stays in the furnace in an unburned state, the unburned pulverized coal accumulates as “char” in the lower part of the furnace or in the core of the furnace, impairing the breathability and liquid permeability in the furnace. To do.
そして、炉下部や炉芯部において“チャー”が蓄積した状態になると、微粉炭の燃焼発熱が充分でなくなり、微粉炭吹き込みによる効果が低減し、その結果、高炉における燃料比が上昇する。 When “char” is accumulated in the lower part of the furnace and the core part of the furnace, the combustion heat of the pulverized coal is not sufficient, and the effect of the pulverized coal injection is reduced. As a result, the fuel ratio in the blast furnace is increased.
このような現象（微粉炭の未燃焼、チャーの蓄積）は、特に、揮発分の含有量が２０％以下の低揮発分の微粉炭を使用した時に起こり易い。即ち、高炉下部や炉芯部において、微粉炭が未燃焼状態で滞留し、燃料比の上昇を招く状況を増長する。 Such a phenomenon (unburned pulverized coal, accumulation of char) is likely to occur particularly when low-volatile pulverized coal having a volatile content of 20% or less is used. That is, the situation where the pulverized coal stays in an unburned state in the lower part of the blast furnace and the core part of the furnace and increases the fuel ratio.
したがって、従来、高炉吹込み用微粉炭製造用の炭材としては、比較的燃焼性の良い高揮発分の炭材が適していると考えられ、これまで、上記炭材として、高揮発分の炭材が専ら用いられていた（例えば、特許文献１、参照）。 Therefore, conventionally, as a carbon material for producing pulverized coal for blast furnace injection, a carbon material having a relatively high combustibility is considered suitable. Carbonaceous materials have been used exclusively (for example, see Patent Document 1).
特許文献１には、送風羽口から熱風とともに微粉炭を吹き込む高炉操業において、微粉炭中の揮発分（ＶＭ）と、さらに、流動指数（ＭＦ）に注目し、揮発分（ＶＭ）が２３％以上で、流動度指数（ＭＦ）が０．８０以下の石炭を用いて操業する微粉炭吹き込み操業方法が開示されている。
In
しかし、上記操業方法のように、特定範囲の高揮発分の炭材を粉砕した微粉炭しか吹き込めない高炉操業は、石炭資源全体を有効に利用することを考えた場合、好ましいものではない。 However, blast furnace operation in which only pulverized coal obtained by pulverizing a specific range of highly volatile carbonaceous material as in the above operation method is not preferable when considering the effective use of the entire coal resources.
一方、特許文献２には、低揮発分の石炭を、高炉吹き込み用微粉炭製造用の炭材として使用するという観点から、低揮発分の微粉炭に、高揮発分の微粉炭を一定の割合以上混合して羽口から吹き込む、低揮発分の石炭の使用方法が開示されている。 On the other hand, in Patent Document 2, from the viewpoint that low-volatile coal is used as a carbonaceous material for producing pulverized coal for blast furnace injection, a high proportion of high-volatile matter pulverized coal is added to low-volatile coal. A method for using low-volatile coal that is mixed and blown from the tuyere is disclosed.
しかし、上記使用方法においては、低揮発分の炭材と高揮発分の炭材を混合して使用することを前提とするので、低揮発分の炭材を大量に使用することはできず、結局、低揮発分の炭材の使用量には限界がある。 However, in the above method of use, since it is premised on the use of a mixture of a low volatile carbon material and a high volatile carbon material, a low volatile carbon material cannot be used in large quantities. After all, there is a limit to the amount of low volatile carbon materials used.
通常、微粉炭中の揮発分含有量の低下に伴い、微粉炭の燃焼性が悪化するので、従来は、使用する微粉炭の揮発分含有量に下限を設定するか、又は、高揮発分の炭材を混合し、微粉炭の燃焼性を確保しているが、いずれの方法も、低揮発分の炭材の使用量には限界があり、石炭資源全体の有効利用に資するものではない。 Usually, as the volatile content in pulverized coal decreases, the flammability of pulverized coal deteriorates, so conventionally, the lower limit is set for the volatile content of the pulverized coal used, or high volatile content Although carbonaceous materials are mixed to ensure the combustibility of pulverized coal, either method has a limit in the amount of low-volatile carbonaceous materials used, and does not contribute to effective utilization of the entire coal resources.
前述したように、従来は、微粉炭の吹き込みにおいて、微粉炭の燃焼性を確保するため、所定量以上の揮発分を含有する微粉炭だけを使用するか、又は、低揮発分の微粉炭を使用するにしても、高揮発分の微粉炭を所定量混合して使用するが、このような使用態様は、石炭資源全体の有効利用を考えた場合、好ましくない。 As described above, conventionally, in order to ensure the combustibility of the pulverized coal in the pulverized coal blowing, only the pulverized coal containing a predetermined amount or more of volatile matter is used, or the pulverized coal having a low volatile content is used. Even if it uses, although a predetermined amount of pulverized coal with a high volatile content is mixed and used, such a use mode is not preferable when considering effective utilization of the entire coal resource.
揮発分含有量の高低に関係なく、できるだけ幅広い銘柄、種類の炭材を、高炉吹込み用微粉炭製造用の炭材として使用することが、エネルギーの安全供給や、価格の安定化の点からも望ましい。 Regardless of the level of volatile content, the use of as wide a range of brands and types of charcoal as possible for the production of pulverized coal for blast furnace injection is necessary for safe energy supply and price stabilization. Is also desirable.
したがって、微粉炭を吹き込む高炉操業においては、（ｉ）揮発分含有量の低い石炭を、高炉吹き込み微粉炭として如何に使用するか、また、（ii）揮発分含有量の低い微粉炭を使用する際に、微粉炭の性状を踏まえ、炉内における燃焼率を如何に高めるかが重要な課題である。 Therefore, in blast furnace operation for blowing pulverized coal, (i) how to use coal with low volatile content as blast furnace blown pulverized coal, and (ii) using pulverized coal with low volatile content. At the same time, how to increase the combustion rate in the furnace based on the properties of pulverized coal is an important issue.
本発明は、上記課題を解決する、高炉吹込み用微粉炭とその製造方法、及び、微粉炭吹き込み高炉操業方法を提供することを目的とする。 An object of this invention is to provide the pulverized coal for blast furnace injection which solves the said subject, its manufacturing method, and the blast furnace operating method of pulverized coal injection.
本発明者は、種々の粒度と揮発分含有量の微粉炭について燃焼実験を行い、燃焼率、２０μｍ以下の質量割合（％）、及び、揮発分の平均含有量（％）の相関を調査した。 The present inventor conducted a combustion experiment on pulverized coal having various particle sizes and volatile content, and investigated the correlation between the combustion rate, the mass ratio (%) of 20 μm or less, and the average content (%) of volatile matter. .
その結果、本発明者は、炭材を粉砕する場合、揮発分含有量に応じ、粉砕程度を調整し、所定粒度の微粉炭の割合を所要の割合に調整すれば、微粉炭の炉内における燃焼性を、充分に確保できることを見いだした。この点については、後述する。 As a result, when pulverizing the carbonaceous material, the present inventor adjusts the degree of pulverization according to the volatile content, and adjusts the ratio of the pulverized coal of a predetermined particle size to the required ratio. It was found that sufficient flammability can be secured. This point will be described later.
本発明は、上記知見に基づいてなされたもので、その要旨は以下のとおりである。 This invention was made | formed based on the said knowledge, and the summary is as follows.
（１） 炭材を粉砕し高炉吹込み用微粉炭を製造する方法において、該炭材を、粒径（２０±ｚ）μｍ以下の微粉炭の質量割合α（％）が、下記（１）式を満たすように粉砕することを特徴とする高炉吹込み用微粉炭の製造方法。
α≧β−γ・ＶＭ ・・・（１）
ここで、β：設定した評価基準の燃焼率で定まる定数
γ：設定した評価基準の燃焼率で定まる係数
ＶＭ：高炉吹込み微粉炭中の揮発分の平均含有量（％）
(1) In the method for producing pulverized coal for blast furnace injection by pulverizing a carbon material, the carbon material has a mass ratio α (%) of pulverized coal having a particle size of (20 ± z) μm or less (1) A method for producing pulverized coal for blast furnace injection, characterized by pulverizing to satisfy the formula.
α ≧ β−γ · VM (1)
Where β is a constant determined by the combustion rate of the set evaluation criteria
γ: Coefficient determined by the combustion rate of the set evaluation standard
VM: Average content of volatile matter in blast furnace-blown pulverized coal (%)
（２） 前記粒径（２０±ｚ）μｍにおけるｚが１０であることを特徴とする前記（１）に記載の高炉吹込み用微粉炭の製造方法。 (2) The method for producing pulverized coal for blast furnace injection according to (1), wherein z in the particle size (20 ± z) μm is 10.
（３） 前記設定した評価基準の燃焼率が６０％であることを特徴とする前記（１）又は（２）に記載の高炉吹込み用微粉炭の製造方法。 (3) The method for producing pulverized coal for blast furnace injection according to (1) or (2) above, wherein the combustion rate of the set evaluation criterion is 60%.
（４） 前記下記（１）式において、β＝５０、γ＝０．３７であることを特徴とする前記（１）〜（３）のいずれかに記載の高炉吹込み用微粉炭の製造方法。 (4) In the following formula (1), β = 50 and γ = 0.37, The method for producing pulverized coal for blast furnace injection according to any one of the above (1) to (3) .
（５） 前記（１）〜（４）のいずれかに記載の高炉吹込み用微粉炭の製造方法で製造した高炉吹込み用微粉炭。 (5) Blast furnace blowing pulverized coal produced by the method for producing blast furnace blowing pulverized coal according to any one of (1) to (4).
（６） 前記（５）に記載の高炉吹込み用微粉炭を、羽口から吹き込むことを特徴とする微粉炭吹き込み高炉操業方法。 (6) A pulverized coal blowing blast furnace operating method, characterized in that the pulverized coal for blast furnace blowing described in (5) is blown from a tuyere.
本発明によれば、微粉炭中の揮発分含有量が変化した場合でも、微粉炭の燃焼性を適正レベルに維持することができるので、微粉炭吹き込み操業における種々の制約を解消し、安定した高炉操業を継続して実施することができる。 According to the present invention, even when the volatile content in the pulverized coal changes, the combustibility of the pulverized coal can be maintained at an appropriate level, thereby eliminating various restrictions in the pulverized coal blowing operation and stabilizing Blast furnace operation can be continued.
通常、微粉炭の燃焼性は、微粉炭の組成、特に、揮発分と固定炭素の含有量によって決まる。即ち、揮発分含有量が低い炭材の燃焼性が低いのは、揮発分含有量が高い炭材に比べ、燃焼性の低い固定炭素の含有量が多く、燃焼性の高い揮発分が少ないからである。 Usually, the combustibility of pulverized coal is determined by the composition of pulverized coal, in particular, the content of volatile matter and fixed carbon. In other words, the reason why the flammability of the carbon material with low volatile content is low is because the content of fixed carbon with low flammability is large and the volatile content with high combustibility is low compared with the carbon material with high volatile content. It is.
微粉炭の燃焼性を改善する一方法は、炭材を微粉砕することであるが、燃焼性を左右する揮発分の含有量と粉砕粒度との関係は明確でない。また、炭材を必要以上に粉砕することは、粉砕に要するエネルギーを増加することになるので、粉砕効率上及び粉砕コスト上、好ましくない。 One method for improving the combustibility of pulverized coal is to pulverize the carbonaceous material, but the relationship between the content of volatile matter that affects the combustibility and the pulverized particle size is not clear. In addition, pulverizing the carbonaceous material more than necessary increases the energy required for pulverization, which is undesirable in terms of pulverization efficiency and pulverization cost.
そこで、本発明者は、表１に示す種々の組成及び揮発分含有量の微粉炭について、粒度構成を変えて燃焼実験を行い、微粉炭の燃焼性を調査した。微粉炭吹込み量を１５０ｋｇ／ｔとして行った燃焼実験の結果の一例を、図１に示す。 Therefore, the present inventor conducted a combustion experiment on pulverized coals having various compositions and volatile contents shown in Table 1 while changing the particle size composition, and investigated the combustibility of the pulverized coals. An example of the result of the combustion experiment conducted with the pulverized coal injection rate set at 150 kg / t is shown in FIG.
なお、燃焼率は、燃焼前に存在する可燃分のうち燃焼により消費されたものの重量割合と定義されるもので、燃焼前後の未燃分である灰分のバランスより求めたものである。 The combustion rate is defined as the weight ratio of combustible components present before combustion and consumed by combustion, and is determined from the balance of ash that is unburned before and after combustion.
図１に示す結果から、燃焼率は、粒径２０μｍ以下の微粉炭の質量割合と揮発分の平均含有量に依存し、揮発分の平均含有量が低い炭材を粉砕する場合には、粉砕を強化して、粒径２０μｍ以下の微粉炭の質量割合を増加すれば、微粉炭の燃焼性を、燃焼率で６０％以上確保できることが判明した。 From the results shown in FIG. 1, the combustion rate depends on the mass ratio of pulverized coal having a particle size of 20 μm or less and the average content of volatile matter. It was found that if the mass ratio of pulverized coal having a particle size of 20 μm or less is increased and the flammability of pulverized coal can be secured at a combustion rate of 60% or more.
さらに、図１に示す結果から、炭材を、揮発分含有量の高低に拘わらず、粒径２０μｍ以下の微粉炭の質量割合α（％）が、下記（１’）式を満たすように粉砕することが好ましいことが判明した（図中の「点線」参照）。
α≧５０−０．３７・ＶＭ ・・・（１’）
ここで、α：粒径２０μｍ以下の微粉炭の質量割合（％）
ＶＭ：高炉吹込み微粉炭の揮発分の平均含有量（％）
である。
Furthermore, from the results shown in FIG. 1, the carbonaceous material is pulverized so that the mass ratio α (%) of pulverized coal having a particle size of 20 μm or less satisfies the following formula (1 ′) regardless of the level of volatile content. It was found to be preferable (see “dotted line” in the figure).
α ≧ 50−0.37 · VM (1 ′)
Here, α: mass ratio (%) of pulverized coal having a particle size of 20 μm or less
VM: Average content of volatile matter in blast furnace-blown pulverized coal (%)
It is.
式（１’）中の定数“５０”及び係数“０．３７”は、評価のために設定する基準燃焼率により変わるので、所望の燃焼性を確保するためには、粒径２０μｍ以下の微粉炭の質量割合α（％）と揮発分の平均含有量ＶＭ（％）は、下記（１）式を満たす必要がある。
α≧β−γ・ＶＭ ・・・（１）
ここで、β：基準燃焼率で定まる定数
γ：基準燃焼率で定まる係数
The constant “50” and the coefficient “0.37” in the formula (1 ′) vary depending on the reference combustion rate set for evaluation. Therefore, in order to ensure the desired combustibility, fine powder with a particle size of 20 μm or less The mass ratio α (%) of charcoal and the average content VM (%) of volatile components must satisfy the following formula (1).
α ≧ β−γ · VM (1)
Where β is a constant determined by the reference combustion rate
γ: Coefficient determined by the reference combustion rate
微粉炭の燃焼性を改善する一方法は、炭材を微粉砕することであるので、炭材をできるだけ微細に粉砕することが好ましいが、本発明においては、粉砕効率や粉砕エネルギーの点での限界を考慮し、上記（１’）式において、基準とする粒径を２０μｍとし、αは、粒径２０μｍ以下の微粉炭の質量割合（％）と定義した。 One method for improving the combustibility of pulverized coal is to finely pulverize the carbonaceous material, so it is preferable to pulverize the carbonaceous material as finely as possible, but in the present invention, in terms of pulverization efficiency and pulverization energy. In consideration of the limit, in the above formula (1 ′), the reference particle size was 20 μm, and α was defined as the mass ratio (%) of pulverized coal having a particle size of 20 μm or less.
しかし、αを定義する粒径は、ランス形状、固気比、送風条件など微粉炭の吹込み条件によっても変動するので、好ましい粒径２０μｍを中心として（２０±ｚ）μｍの範囲で、適宜、設定することが好ましい。ｚは微粉炭吹込み条件が類似の状況において適切な値を選定すればよいが、通常は１０程度である。 However, the particle size defining α varies depending on the pulverized coal blowing conditions such as the lance shape, the solid-gas ratio, and the blowing conditions. It is preferable to set. Although z should just select an appropriate value in the situation where pulverized coal blowing conditions are similar, it is about 10 normally.
本発明は、まず、高炉吹込み用微粉炭製造用の炭材を、粉砕後の粒度が、上記（１）式又は（１’）式を満たすように粉砕することを特徴とする。 The present invention is characterized in that, first, a carbon material for producing pulverized coal for blast furnace blowing is pulverized so that the particle size after pulverization satisfies the above formula (1) or (1 ').
そして、本発明は、さらに、上記（１）式又は（１’）式を満たす微粉炭を、羽口から吹き込むことを特徴とする。 The present invention is further characterized in that pulverized coal satisfying the above formula (1) or (1 ') is blown from the tuyere.
上記（１）式又は（１’）式を満たす微粉炭を吹き込むことにより、微粉炭の燃焼性が向上し、燃料比が低下する理由は、次のように考えられる。 The reason why the combustibility of the pulverized coal is improved and the fuel ratio is decreased by injecting the pulverized coal satisfying the formula (1) or (1 ') is considered as follows.
羽口から、上記（１）式又は（１’）式を満たす微粉炭を吹き込むと、燃焼性が良い微粒（粒径２０μｍ以下）の微粉炭が、優先的に羽口先で燃焼し、高温の燃焼場を形成する。混在する燃焼性の低い粗粒（粒径２０μｍ超）の微粉炭が、燃焼性が良い微粉炭が形成した高温の燃焼場に曝されて燃焼が促進されるため、微粉炭全体としての燃焼率が向上する。 When pulverized coal satisfying the above formula (1) or (1 ′) is blown from the tuyere, fine pulverized coal with good combustibility (particle size of 20 μm or less) is preferentially burned at the tip of the tuyere. Create a combustion field. Combustion rate of the pulverized coal as a whole is promoted by exposing the mixed pulverized coal with low combustibility (particle size of more than 20 μm) to a high-temperature combustion field formed by pulverized coal with good combustibility. Will improve.
次に、本発明の実施例について説明するが、実施例の条件は、本発明の実施可能性及び効果を確認するために採用した一条件例であり、本発明は、この一条件例に限定されるものではない。本発明は、本発明の要旨を逸脱せず、本発明の目的を達成する限りにおいて、種々の条件を採用し得るものである。 Next, examples of the present invention will be described. The conditions of the examples are one example of conditions adopted for confirming the feasibility and effects of the present invention, and the present invention is limited to this one example of conditions. Is not to be done. The present invention can adopt various conditions as long as the object of the present invention is achieved without departing from the gist of the present invention.
（実施例１）
表２に示す平均揮発分、α、粒径２０μｍ以下の質量割合（％）の微粉炭を用意し、内容積３２７３ｍ3の高炉の操業において、羽口から、吹込み量１００〜２５０ｋｇ／ｔの範囲で炉内に吹き込んだ。その結果を、表２に併せて示す。
Example 1
Prepare pulverized coal with an average volatile content, α, and a mass ratio (%) of particle size of 20 μm or less shown in Table 2, and in the operation of a blast furnace with an internal volume of 3273 m 3 , the amount of blowing is 100 to 250 kg / t from the tuyere. Blowed into the furnace. The results are also shown in Table 2.
粒径２０μｍ以下の微粉炭の質量割合（％）が、αを超える微粉炭を吹き込んだ本発明例においては、通気抵抗指数が低く、炉内の通気性が安定しており、荷降下指数も低く、装入物の降下状況も良好であり、操業が安定して継続した。その結果、低出銑比と、高出銑量を達成できた。 In the present invention example in which pulverized coal having a particle size of 20 μm or less in which the mass ratio (%) of the pulverized coal exceeds α, the ventilation resistance index is low, the air permeability in the furnace is stable, and the load drop index is also It was low and the state of charge drop was good, and the operation continued stably. As a result, a low output ratio and a high output were achieved.
これに対し、粒径２０μｍ以下の微粉炭の質量割合（％）が、α未満の微粉炭を吹き込んだ対比例においては、通気抵抗指数が高く、操業成績が悪化した。これは、吹き込まれた微粉炭の燃焼率が低下して、未燃焼の“チャー”が生じ、炉下部や炉芯部に堆積したことに起因すると推測される。 On the other hand, when the mass ratio (%) of pulverized coal having a particle size of 20 μm or less was blown with pulverized coal having a value less than α, the airflow resistance index was high, and the operation results deteriorated. This is presumed to be due to the fact that the combustion rate of the pulverized coal that has been blown decreases and unburned “char” is generated and deposited in the lower part of the furnace or in the furnace core.
前述したように、本発明によれば、微粉炭中の揮発分含有量が変化した場合でも、燃焼効率を適正レベルに維持することができるので、微粉炭吹き込み操業における種々の制約を解消し、安定した高炉操業を継続して実施することができる。したがって、本発明は、高炉操業上の利用可能性が高いものである。 As described above, according to the present invention, even when the volatile content in the pulverized coal is changed, the combustion efficiency can be maintained at an appropriate level, thereby eliminating various restrictions in the pulverized coal blowing operation, Stable blast furnace operation can be continued. Therefore, the present invention has high applicability in blast furnace operation.
Claims (6)
α≧β−γ・ＶＭ ・・・（１）
ここで、β：設定した評価基準の燃焼率で定まる定数
γ：設定した評価基準の燃焼率で定まる係数
ＶＭ：高炉吹込み微粉炭中の揮発分の平均含有量（％） In the method of pulverizing a carbon material and producing pulverized coal for blast furnace injection, the mass ratio α (%) of the pulverized coal having a particle size (20 ± z) μm or less satisfies the following formula (1). A method for producing pulverized coal for blast furnace injection, characterized by:
α ≧ β−γ · VM (1)
Where β is a constant determined by the combustion rate of the set evaluation criteria
γ: Coefficient determined by the combustion rate of the set evaluation standard
VM: Average content of volatile matter in blast furnace-blown pulverized coal (%)
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| WO2014171297A1 (en) * | 2013-04-19 | 2014-10-23 | Ｊｆｅスチール株式会社 | Blast furnace operation method |
| CN113267609A (en) * | 2021-05-27 | 2021-08-17 | 重庆钢铁股份有限公司 | Quality evaluation method of coal for blast furnace blowing |
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| JPH08176623A (en) * | 1994-12-20 | 1996-07-09 | Nippon Steel Corp | Preparation method of pulverized coal for blast furnace injection |
| JP2001271105A (en) * | 2000-03-27 | 2001-10-02 | Kawasaki Steel Corp | How to blow pulverized coal into the blast furnace |
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| JPH08176623A (en) * | 1994-12-20 | 1996-07-09 | Nippon Steel Corp | Preparation method of pulverized coal for blast furnace injection |
| JP2001271105A (en) * | 2000-03-27 | 2001-10-02 | Kawasaki Steel Corp | How to blow pulverized coal into the blast furnace |
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| WO2014171297A1 (en) * | 2013-04-19 | 2014-10-23 | Ｊｆｅスチール株式会社 | Blast furnace operation method |
| JP5614517B1 (en) * | 2013-04-19 | 2014-10-29 | Ｊｆｅスチール株式会社 | Blast furnace operation method |
| US9873923B2 (en) | 2013-04-19 | 2018-01-23 | Jfe Steel Corporation | Blast furnace operation method |
| CN113267609A (en) * | 2021-05-27 | 2021-08-17 | 重庆钢铁股份有限公司 | Quality evaluation method of coal for blast furnace blowing |
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