JPH051310A - Method for charging raw material into bell-less blast furnace - Google Patents

Method for charging raw material into bell-less blast furnace

Info

Publication number
JPH051310A
JPH051310A JP3057546A JP5754691A JPH051310A JP H051310 A JPH051310 A JP H051310A JP 3057546 A JP3057546 A JP 3057546A JP 5754691 A JP5754691 A JP 5754691A JP H051310 A JPH051310 A JP H051310A
Authority
JP
Japan
Prior art keywords
raw material
furnace
charging
bunker
distribution
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
Application number
JP3057546A
Other languages
Japanese (ja)
Other versions
JP2847994B2 (en
Inventor
Takanobu Inada
隆信 稲田
Yuji Iwanaga
祐治 岩永
Kohei Sunahara
公平 砂原
Yoshimasa Kajiwara
義雅 梶原
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nippon Steel Corp
Original Assignee
Sumitomo Metal Industries Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Sumitomo Metal Industries Ltd filed Critical Sumitomo Metal Industries Ltd
Priority to JP3057546A priority Critical patent/JP2847994B2/en
Publication of JPH051310A publication Critical patent/JPH051310A/en
Application granted granted Critical
Publication of JP2847994B2 publication Critical patent/JP2847994B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B28—WORKING CEMENT, CLAY, OR STONE
    • B28D—WORKING STONE OR STONE-LIKE MATERIALS
    • B28D5/00—Fine working of gems, jewels, crystals, e.g. of semiconductor material; apparatus or devices therefor
    • B28D5/02—Fine working of gems, jewels, crystals, e.g. of semiconductor material; apparatus or devices therefor by rotary tools, e.g. drills
    • B28D5/022—Fine working of gems, jewels, crystals, e.g. of semiconductor material; apparatus or devices therefor by rotary tools, e.g. drills by cutting with discs or wheels
    • B28D5/028—Fine working of gems, jewels, crystals, e.g. of semiconductor material; apparatus or devices therefor by rotary tools, e.g. drills by cutting with discs or wheels with a ring blade having an inside cutting edge

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Manufacture Of Iron (AREA)
  • Blast Furnaces (AREA)

Abstract

PURPOSE:To suitably keep gas flow distribution in diameter direction of a blast furnace and to stabilize the operation by adjusting dimentioless index so as to become the specific value or more at the time of charging raw material into a bunker and adopting outer spreading distribution method at the time of charging the raw material into the furnace. CONSTITUTION:At the time of charging the raw material 1 into the lowest step bunker 4, raw material supplying velocity (v) is adjusted so that the dimentionless index + or - becomes >=5X10<-3>. At the time of charging the raw material into the furnace 10 from the bunker 4, the outer spreading distribution method is adopted with a distributing chute 9. By this method, coarse grain raw material can be piled into center part of the furnace and good ventilating blasting condition is obtd.

Description

【発明の詳細な説明】Detailed Description of the Invention

【０００１】[0001]

【産業上の利用分野】この発明は、高炉の炉頂部に設け
た原料貯槽（以下「炉頂バンカー」または単に「バンカ
ー」と記す) と分配シュートとを使用する、いわゆるベ
ルレス高炉において、前記分配シュートの傾動角度を操
作して炉中心部から炉壁部へ向かって原料を装入してい
く、いわゆる外振り分配装入方式で炉内に装入される原
料粒径の経時変化を制御する原料装入方法に関するもの
である。BACKGROUND OF THE INVENTION The present invention relates to a so-called bellless blast furnace which uses a raw material storage tank (hereinafter referred to as "furnace top bunker" or simply "bunker") provided at the top of a blast furnace and a distribution chute for the above-mentioned distribution. By controlling the tilt angle of the chute, the raw material is charged from the center of the furnace to the wall of the furnace, which controls the change over time in the particle size of the raw material charged into the furnace by the so-called external swing distribution charging method. The present invention relates to a raw material charging method.

【０００２】[0002]

【従来の技術】高炉操業においては、炉内の径方向のガ
ス流分布を制御し、炉内鉱石の還元・溶解を安定に行う
ことが、操業上の基本課題である。2. Description of the Related Art In blast furnace operation, controlling the radial gas flow distribution in the furnace to stably reduce and dissolve the ore in the furnace is a basic operation problem.

【０００３】高炉操業における炉内ガス流分布の主たる
制御手段は、炉頂の装入物分布制御であり、より詳しく
は炉内径方向の鉱石とコークスの堆積重量比分布( 以下
「O/C 分布」と称す）と、鉱石、コークスそれぞれの粒
径分布の調整である。The main control means of the in-furnace gas flow distribution in blast furnace operation is the control of the charge distribution at the furnace top, and more specifically, the deposit weight ratio distribution of ore and coke in the inner diameter direction of the furnace (hereinafter referred to as "O / C distribution"). ") And the ore and coke particle size distribution adjustment.

【０００４】ベルレス高炉における原料装入装置は、炉
内に直接原料を供給する炉頂バンカーが１ケのものと複
数個のものとに大きく分類できる。図１は、直列２段の
炉頂バンカーを有するベルレス装入装置の１例を示して
いる。原料 (鉱石、焼結鉱、コークス) １は、ベルトコ
ンベアー２でまず炉頂上段バンカー３に蓄えられ、ここ
から排圧した下段バンカー４に供給される。そして、炉
内の装入物が荷下がりして補給すべき所定のストックラ
イン５に達すると装入物流量調整用のゲート弁６および
シール弁７を開操作して、下段バンカー内の原料８を分
配シュート９上に供給し、この分配シュートの傾動角
度、旋回数を調整して原料を炉内10に装入する。The raw material charging device in the bellless blast furnace can be broadly classified into one having a top bunker for directly supplying the raw material into the furnace and one having a plurality of bunkers. FIG. 1 shows an example of a bellless charging device having a two-stage furnace top bunker in series. A raw material (ore, sinter, coke) 1 is first stored in a furnace top bunker 3 by a belt conveyor 2 and then supplied to a lower bunker 4 whose pressure is discharged. Then, when the charge in the furnace unloads and reaches a predetermined stock line 5 to be replenished, the gate valve 6 and the seal valve 7 for adjusting the flow rate of the charge are opened, and the raw material 8 in the lower bunker is opened. Is supplied to the distribution chute 9, and the raw material is charged into the furnace 10 by adjusting the tilt angle and the number of turns of the distribution chute.

【０００５】ベルレス高炉におけるO/C 分布制御は、主
に分配シュートの運転スケジュール（具体的にはシュー
トの傾動角設定と、その傾動角での旋回数割り付け) の
制御によってなされ、粒径分布に対しては炉内に装入さ
れる原料の粒径の経時変化を利用してなされる。即ち、
通常のベルレス装入では、分配シュートを10旋回以上さ
せて原料を炉内に装入し、かつその間に分配シュートの
傾動角度を１回以上変更して原料の炉内落下位置を変化
させる装入形態をとっている。このとき分配シュートに
供給される原料の粒径が１回のダンプの中で経時的に変
化すると、その影響は炉の内径方向の粒径分布に現れ
る。The O / C distribution control in the bellless blast furnace is performed mainly by controlling the operation schedule of the distribution chute (specifically, setting the tilt angle of the chute and assigning the number of turns at that tilt angle), and the particle size distribution is controlled. On the other hand, it is performed by utilizing the change with time of the particle size of the raw material charged in the furnace. That is,
In normal bellless charging, the distribution chute is rotated 10 times or more to load the raw material into the furnace, and during that time, the tilt angle of the distribution chute is changed once or more to change the falling position of the raw material in the furnace. It takes a form. At this time, when the particle size of the raw material supplied to the distribution chute changes with time in one dump, the influence appears in the particle size distribution in the inner diameter direction of the furnace.

【０００６】炉頂バンカーから排出される原料粒径に経
時的変化が現れることについては、既に幾多の報告があ
るがその主たる要因は、炉頂バンカー内原料が径方向
に粒径分布を持つこと、およびバンカー底部から原料
を排出した際、バンカー中心部が先に排出される、いわ
ゆるバンカー内に生じるファンネルフロー型の物流であ
る（鉄と鋼74(1988)P.978)。[0006] There have already been many reports that the particle size of the raw material discharged from the top bunker changes with time, but the main factor is that the raw material in the top bunker has a particle size distribution in the radial direction. , And when the raw material is discharged from the bottom of the bunker, the center of the bunker is discharged first, which is a so-called funnel flow type distribution that occurs in the bunker (Iron and Steel 74 (1988) P.978).

【０００７】従って、上記およびの要因の少なくと
も一方を制御することにより、排出原料の粒径の経時変
化パターンを変化させることができ、従来このような観
点に立った種々の考案がなされている。の要因につい
ては、バンカー内の排出口直上部に邪魔物（インサー
ト) を設置して、ファンネルフローを抑止する方法があ
る。一方、については、バンカー内に反発箱（ストー
ンボックス) を設け、バンカーに装入される原料を複数
箇所、あるいは同心円上に散乱・落下させる方法（実公
昭56−18597 号公報) や、炉頂バンカー内に旋回シュー
トを設けてその傾動角度を調整すること（特開平１−11
9612号公報) により、あるいは反発板を設けその角度を
調整すること（特公平２−401 号公報) によって、原料
落下位置を制御する方法などが提案されている。しか
し、これらの方法でもベルレス高炉における装入物の炉
内粒径分布を的確に制御する効果は必ずしも充分ではな
い。Therefore, by controlling at least one of the above factors and the above, it is possible to change the time-dependent change pattern of the particle size of the discharged raw material, and various ideas have been hitherto made from such a viewpoint. Regarding the cause of this, there is a method to suppress the funnel flow by installing an obstacle (insert) directly above the outlet in the bunker. On the other hand, as for the method, a repulsion box (stone box) is provided in the bunker to scatter and drop the raw materials to be charged into the bunker at multiple points or in concentric circles (Act No. Sho 56-18597) or the furnace top. Providing a turning chute in the bunker to adjust the tilt angle (Japanese Patent Laid-Open No. 1-11
No. 9612), or by providing a repulsion plate and adjusting the angle thereof (Japanese Patent Publication No. 2-401), there has been proposed a method of controlling the material dropping position. However, even with these methods, the effect of accurately controlling the particle size distribution of the charge in the bellless blast furnace is not always sufficient.

【０００８】ところで、原料を分配シュートを介して炉
内に装入する際、通常、分配シュートの傾動角度を操作
して炉壁部から炉中心部に向かって順次原料を装入する
方法（以下「内振り分配装入」と称す）がとられている
が、これとは逆の順序で原料を炉内に装入する方法（以
下「外振り分配装入」と称す) は、前者に比べ分配シュ
ート駆動系の高い能力を要求するものの堆積層を炉中心
側から順次形成していくものであるため、コークス層崩
れを制御する効果を持っており、装入物分布形成時の不
安定因子の影響を軽減する利点を持っている（特開昭62
−177109号公報参照）。By the way, when charging the raw material into the furnace through the distribution chute, a method of charging the raw material sequentially from the furnace wall to the center of the furnace by operating the tilt angle of the distribution chute (hereinafter The method of charging raw materials into the furnace in the reverse order (hereinafter referred to as "outside distribution charging") is the same as the former method. Although it requires high performance of the distribution chute drive system, it has the effect of controlling the coke layer collapse because it forms the deposited layers sequentially from the center of the furnace. It is an instability factor when forming the charge distribution. Has the advantage of reducing the effect of
-177109 gazette).

【０００９】しかしながら、上記の外振り分配法を適用
するに当たっては次のような点を解決する必要がある。
即ち、高炉内の径方向のガス流の分布としては、炉況の
安定性を確保するためには炉中心部のガス流が他領域よ
りも強い分布にしておく必要があることが経験的に知ら
れている。このような径方向ガス流分布を得るには、炉
中心部を炉壁側よりも通気性の良い状態にしておく必要
があり、そのために炉中心部のO/C を低めにし、かつ堆
積粒径を大きくしておかなければならない。従って、外
振り分配装入の適用に当たっては、装入初期の原料（即
ち、炉中心部装入原料) の粒度を粗くしておく必要があ
る。ところが、従来の炉頂バンカーへの原料装入条件で
は、後に詳細するように、バンカーからの排出原料の粒
径の経時変化は、前記のような種々の工夫を凝らしても
基本的には単調増加パターン、あるいはフラットパター
ンを呈するにとどまり、装入初期に粗粒の原料を集中排
出することは困難である。However, in applying the above-mentioned external distribution method, it is necessary to solve the following points.
In other words, as a radial gas flow distribution in the blast furnace, it is empirically found that it is necessary to make the gas flow in the central part of the furnace have a stronger distribution than other regions in order to secure the stability of the furnace condition. Are known. In order to obtain such a radial gas flow distribution, it is necessary to make the furnace center area more permeable than the furnace wall side. The diameter must be large. Therefore, when applying external distribution charging, it is necessary to make the grain size of the raw material at the initial stage of charging (that is, the raw material at the center of the furnace) coarse. However, under the conditions for charging raw materials into the conventional furnace top bunker, as will be described in detail later, the change over time in the particle size of the raw material discharged from the bunker is basically monotonous even if the various measures described above are elaborated. It is difficult to centrally discharge the coarse-grained raw material in the initial stage of charging, as long as it exhibits an increasing pattern or a flat pattern.

【００１０】[0010]

【発明が解決しようとする課題】本発明の目的は、原料
を複数個の炉頂バンカーを介して炉内に装入するベルレ
ス高炉で外振り分配装入を行うに当たって、炉内に装入
される原料の粒径の経時変化を外振り分配装入に適する
形に制御する方法を提供することにある。SUMMARY OF THE INVENTION An object of the present invention is to perform external distribution charging in a bellless blast furnace in which raw materials are charged into the furnace through a plurality of bunker tops. Another object of the present invention is to provide a method for controlling the change in the particle size of a raw material with time to a form suitable for external distribution charging.

【００１１】[0011]

【課題を解決するための手段】本発明は、下記 (1)〜
(3) を特徴とするベルレス高炉の原料装入方法を要旨と
する。The present invention includes the following (1) to
The raw material charging method of the bellless blast furnace characterized by (3) is summarized.

【００１２】(1) 原料貯槽の中の最下段の貯槽から排出
される原料を分配シュートを介して炉内に装入するベル
レス高炉において、(2) 前記分配シュートの傾動角度を
操作して炉中心部から炉壁部へ向かって原料を装入して
いく、いわゆる外振り分配装入を行うに当たって、(3)
原料貯槽群の最下段貯槽への原料供給速度を下記式か
ら計算される無次元数πが５×10-3以上となるよう調整
する。(1) In a bellless blast furnace in which the raw material discharged from the lowermost storage tank in the raw material storage tank is charged into the furnace through the distribution chute, (2) the tilt angle of the distribution chute is operated In the so-called external distribution charging, in which the raw material is charged from the center toward the furnace wall, (3)
Adjust the feed rate of the raw material to the lowermost storage tank of the raw material storage group so that the dimensionless number π calculated from the following formula is 5 × 10 -3 or more.

【００１３】[0013]

【数２】 [Equation 2]

【００１４】ここで、ｖ: 原料装入速度(kg/sec)、ｇ:
重力加速度(m/sec2) ρ: 原料嵩密度(kg/m3) 、 Ｄ: バンカー径(m) Ｈ: 装入落差（ｍ）Here, v: raw material charging rate (kg / sec), g:
Gravity acceleration (m / sec 2 ) ρ: Raw material bulk density (kg / m 3 ), D: Bunker diameter (m) H: Insertion head (m)

【００１５】[0015]

【作用】バンカー内の径方向粒径分布は、先に述べた原
料落下点の位置や数に加え、堆積斜面上での粒径偏析過
程を通して最終的に決まるものである。本発明はこの後
者の過程を利用してバンカー内の径方向粒径分布を変
え、さらにこのバンカーからの排出されて炉内に装入さ
れる原料の粒径の経時変化を制御しようとするものであ
る。The radial particle size distribution in the bunker is finally determined by the particle size segregation process on the deposition slope in addition to the position and number of the raw material dropping points described above. The present invention utilizes this latter process to change the radial particle size distribution in the bunker, and to control the change over time in the particle size of the raw material discharged from the bunker and charged into the furnace. Is.

【００１６】本発明では前記の式から計算される無次
元指数が５×１０−３以上となるよう最下段貯槽への原
料供給速度（ｖ）を調整する。In the present invention, the feed rate (v) of the raw material to the lowermost storage tank is adjusted so that the dimensionless index calculated from the above equation becomes 5 × 10 −3 or more.

【００１７】一般に粒度構成を有する粒状物を堆積させ
たときに堆積斜面上に生ずる粒度偏析（堆積粒状物の粒
度が堆積位置によって相異する現象）は、粒状物の供給
条件によって変化することが知られている（鉄と鋼74(1
988)P.978)。しかし、この現象を定量的に解析して高炉
の原料装入に利用することは未だなされていない。In general, the segregation of particles (a phenomenon in which the particle size of the deposited particles differs depending on the deposition position) that occurs on the deposition slope when the particles having a particle size configuration are deposited may change depending on the supply conditions of the particles. Known (Iron and Steel 74 (1
988) P. 978). However, this phenomenon has not been quantitatively analyzed and used for charging the raw material of the blast furnace.

【００１８】本発明者らは高炉における原料貯蔵用バン
カーを対象に実炉で使用している焼結鉱を用いて前記の
現象を定量的に把握する実験を行った。実験は、実物大
模型および1/10縮尺模型を使用して行い、従来の装入法
に相当する範囲を含めて、それよりも広い範囲にわたっ
て実施した。表１に実験条件を示す。The inventors conducted an experiment for quantitatively grasping the above phenomenon using a sinter used in an actual furnace for a bunker for storing raw materials in a blast furnace. The experiment was conducted using a full-scale model and a 1/10 scale model, and was conducted over a wider range including the range corresponding to the conventional charging method. Table 1 shows the experimental conditions.

【００１９】[0019]

【表１】 [Table 1]

【００２０】表１中の原料装入条件（装入速度、装入落
差）を種々に組み合わせて、バンカー内の粒径偏析の度
合いを比較した結果を図２に示す。ここで、バンカー内
の粒径偏析の度合いの尺度として、バンカー内の径方向
の粒径分布を原料落下点を起点にして距離の一次関数で
近似したときの勾配 (dDP ／ dr)をとり、原料装入条件
の指標として前記式で示す無次元数 (π) をとった。FIG. 2 shows the results of comparing the degree of particle size segregation in the bunker with various combinations of the raw material charging conditions (charging speed, charging drop) shown in Table 1. Here, as a measure of the degree of particle radially polarized analysis of the bunker, taking the slope at which the radial particle size distribution in the bunker is approximated by a linear function of the distance to the origin raw materials falling point (dD P / dr) The dimensionless number (π) shown in the above equation was taken as an index of raw material charging conditions.

【００２１】このπは、落下原料のバンカー内堆積量に
与える力とバンカー内原料からの反発力との比である。
このような指標をとることにより種々の条件での実験デ
ータを図２に示すように整理することができる。This π is the ratio of the force exerted on the deposited amount of the falling raw material in the bunker and the repulsive force from the raw material in the bunker.
By taking such an index, the experimental data under various conditions can be organized as shown in FIG.

【００２２】図２の横軸πが概ね３×10-3以下の領域
は、従来の炉頂バンカー装入条件に対応するもので "原
料装入速度と高めることによって径方向の粒度偏析が緩
和される、即ち、（dDP ／ dr)が零に近づく" という、
従来の知見と一致する。しかし、上記の実験の結果、無
次元数πが５×10-3以上になると、径方向粒径分布の変
化勾配が零を通り越して逆転するという意外な事実が確
認されたのである。この現象は、バンカーへの原料装入
速度（ｖ）、あるいは装入落差（Ｈ）が大きくなると、
バンカー内の粒径分布形成過程が斜面上の篩分け現象に
支配される形態から、原料飛散現象に支配される形態に
移行することが一つの原因であると考えられる。この現
象を利用すれば、先に述べた原料排出時にバンカー内に
生ずるファンネルフロー型の物流と合わせて、排出原料
の粒径経時変化パターンを従来型 (単調増加型またはフ
ラット型) から逆転させることができ、先に述べた外振
り分配装入で要請される望ましい排出粒径パターン、即
ち、炉中心部に粗粒の原料を堆積させるような装入パタ
ーン、を得ることができるのである。上記の原料装入速
度（ｖ）の制御はバンカー３のゲート弁の開度調整によ
って実施できる。The region in which the horizontal axis π of FIG. 2 is approximately 3 × 10 -3 or less corresponds to the conventional charging conditions for the top bunker. "By increasing the raw material charging speed, the segregation in the radial direction is mitigated. is is, namely, that (dD P / dr) is close to zero ",
Consistent with previous findings. However, as a result of the above experiment, it was confirmed that when the dimensionless number π becomes 5 × 10 −3 or more, the change gradient of the radial particle size distribution passes through zero and reverses. This phenomenon occurs when the material charging speed (v) or the charging drop difference (H) into the bunker increases.
It is considered that one of the causes is that the formation process of the particle size distribution in the bunker shifts from the form controlled by the sieving phenomenon on the slope to the form controlled by the material scattering phenomenon. By utilizing this phenomenon, it is possible to reverse the particle size temporal change pattern of the discharged raw material from the conventional type (monotonically increasing type or flat type) in addition to the funnel flow type distribution that occurs in the bunker when the raw material is discharged as described above. Therefore, it is possible to obtain a desired discharge particle size pattern required by the above-mentioned external distribution charging, that is, a charging pattern for depositing coarse-grained raw material in the center of the furnace. The above-mentioned raw material charging speed (v) can be controlled by adjusting the opening degree of the gate valve of the bunker 3.

【００２３】なお、炉況次第で炉壁側に粗粒の原料を装
入する必要が生じた場合には、無次元数πが５×10-3よ
りも小さくなる条件で最下段バンカーへの原料装入を行
えばよい。If it is necessary to charge the raw material of coarse particles to the furnace wall side depending on the furnace conditions, the lowermost bunker should be charged under the condition that the dimensionless number π is smaller than 5 × 10 -3 . Raw materials may be charged.

【００２４】[0024]

【実施例】先に述べた実物大模型実験と同様にして、本
発明の最終目的とするバンカーからの排出原料の粒径経
時変化パターンの制御性について調査した。試験条件は
下記のとおりである。[Examples] Similar to the above-described full-scale model experiment, the controllability of the temporal change pattern of particle size of the raw material discharged from the bunker, which is the final object of the present invention, was investigated. The test conditions are as follows.

【００２５】バンカーへの原料装入速度（ｖ）： (イ) 9.8 ton/sec このときのπ＝ 1.3×10-2 (ロ) 5.7 ton/sec このときのπ＝ 0.8×10-2 (ハ) 0.6 ton/sec このときのπ＝ 7.5×10-4（従来
例） 装入落差（Ｈ）： 5 m ( 但し (ハ)のみ 4.5 m) バンカー径 ： 7 m 原料（焼結鉱）粒度：表１記載のとおり 調査結果を図３に示す。なお、図３の無次元粒径とは、
各時刻の粒径を装入物平均粒径で割った量である。Charge rate of raw material into bunker (v): (a) 9.8 ton / sec π = 1.3 × 10 -2 (b) 5.7 ton / sec π = 0.8 × 10 -2 (ha) ) 0.6 ton / sec π = 7.5 × 10 -4 at this time (conventional example) Insertion head (H): 5 m (However, only (c) is 4.5 m) Bunker diameter: 7 m Raw material (sintered ore) grain size: As shown in Table 1, the survey results are shown in Figure 3. The dimensionless particle size in FIG. 3 is
It is the amount obtained by dividing the particle size at each time by the average particle size of the charge.

【００２６】図３から明らかなとおり、バンカーへの原
料装入速度が小さい(ハ) の場合は、バンカーから排出さ
れる原料の粒径は初期に小さく、次第に大きくなる。こ
れは無次元数πが 7.5×10-4と小さいからであり、この
ような排出形態では、外振り分配装入を行った場合には
高炉の中心部の原料粒径が小さいものになってしまう。
しかし、原料装入速度が大きい(イ) と(ロ) の場合は、無
次元数πは、それぞれ1.3 ×10-2、 0.8×10-2となり、
排出原料の粒度の経時変化は (ハ)の場合と反対になる。
即ち、初期に粗粒の原料が排出されるから、外振り分配
装入によれば高炉の中心部の原料粒径を大きいものにす
ることができる。As is clear from FIG. 3, when the rate of charging the raw material into the bunker is small (c), the particle size of the raw material discharged from the bunker is initially small and gradually increases. This is because the dimensionless number π is as small as 7.5 × 10 -4 , and in such a discharge mode, when external distribution charging is performed, the raw material particle size in the central part of the blast furnace becomes small. I will end up.
However, when the raw material charging rates are high (a) and (b), the dimensionless number π is 1.3 × 10 -2 and 0.8 × 10 -2 , respectively.
The change over time in the particle size of the discharged raw material is opposite to that in (c).
That is, since the coarse-grained raw material is discharged in the initial stage, it is possible to make the raw material particle diameter in the central portion of the blast furnace large by the external distribution charging.

【００２７】上記のとおり、原料装入速度を大きくし、
無次元数πを５×10-3以上となるよう調整する操作を高
炉原料供給の最終バンカーについて実施することによっ
て、炉内装入原料の粒径経時変化を外振り分配装入にお
ける望ましいパターンに制御し得ることが確認された。As described above, the raw material charging rate is increased,
By controlling the dimensionless number π to be 5 × 10 -3 or more on the final bunker of the blast furnace raw material supply, the change over time in the particle size of the raw material inside the furnace is controlled to the desired pattern for external distribution charging. It was confirmed that it was possible.

【００２８】[0028]

【発明の効果】本発明方法によれば、ベルレス高炉で原
料の外振り分配装入を行う場合でも、炉内装入原料の粒
径の経時変化をその装入法に適したパターンに制御する
ことができるから、この装入法の利点を生かして高炉の
径方向のガス流分布を適正に保ち、高炉操業の安定を期
すことができる。According to the method of the present invention, even when the raw material is externally distributed and charged in the bellless blast furnace, it is possible to control the time-dependent change of the particle size of the raw material in the furnace to a pattern suitable for the charging method. Therefore, the advantage of this charging method can be utilized to appropriately maintain the radial gas flow distribution of the blast furnace and to stabilize the blast furnace operation.

【図面の簡単な説明】[Brief description of drawings]

【図１】ベルレス高炉における原料装入形態の概略説明
図である。FIG. 1 is a schematic explanatory diagram of a raw material charging mode in a bellless blast furnace.

【図２】無次元数πとバンカー内の径方向粒径変化勾配
との関係を示す図である。FIG. 2 is a diagram showing a relationship between a dimensionless number π and a radial-direction particle size change gradient in a bunker.

【図３】本発明の実施例における無次元排出時間と無次
元粒径との関係を示す図である。FIG. 3 is a diagram showing a relationship between a dimensionless discharge time and a dimensionless particle diameter in an example of the present invention.

───────────────────────────────────────────────────── フロントページの続き (72)発明者 梶原 義雅 大阪府大阪市中央区北浜４丁目５番33号 住友金属工業株式会社内 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Yoshimasa Kajiwara 4-53-3 Kitahama, Chuo-ku, Osaka-shi, Osaka Sumitomo Metal Industries, Ltd.

Claims (1)

【特許請求の範囲】 【請求項１】原料貯槽の中の最下段の貯槽から排出され
る原料を分配シュートを介して外振り分配方式で炉内に
装入するベルレス高炉の原料装入方法において、原料貯
槽群の最下段貯槽への原料供給速度を下記式から計算
される無次元数πが５×10-3以上となるよう調整するこ
とを特徴とするベルレス高炉の原料装入方法。 【数１】 ここで、ｖ: 原料装入速度(kg/sec)、ｇ: 重力加速度(m
/sec2) ρ: 原料嵩密度(kg/m3) 、 Ｄ: バンカー径(m) Ｈ: 装入落差(m)Claim: What is claimed is: 1. A method for charging a raw material for a bellless blast furnace, wherein the raw material discharged from the lowermost storage tank in the raw material storage tank is charged into the furnace by an external distribution system via a distribution chute. A method for charging a raw material for a bellless blast furnace, characterized in that the feed rate of the raw material to the lowermost storage tank of the raw material storage tank group is adjusted so that the dimensionless number π calculated from the following formula is 5 × 10 −3 or more. [Equation 1] Where v: raw material charging speed (kg / sec), g: gravity acceleration (m
/ sec 2 ) ρ: Raw material bulk density (kg / m 3 ), D: Bunker diameter (m) H: Charge head (m)
JP3057546A 1991-03-22 1991-03-22 Raw material charging method for bellless blast furnace Expired - Fee Related JP2847994B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP3057546A JP2847994B2 (en) 1991-03-22 1991-03-22 Raw material charging method for bellless blast furnace

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP3057546A JP2847994B2 (en) 1991-03-22 1991-03-22 Raw material charging method for bellless blast furnace

Publications (2)

Publication Number Publication Date
JPH051310A true JPH051310A (en) 1993-01-08
JP2847994B2 JP2847994B2 (en) 1999-01-20

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