JP2741140B2 - Blast furnace operation method - Google Patents

Blast furnace operation method

Info

Publication number
JP2741140B2
JP2741140B2 JP26779692A JP26779692A JP2741140B2 JP 2741140 B2 JP2741140 B2 JP 2741140B2 JP 26779692 A JP26779692 A JP 26779692A JP 26779692 A JP26779692 A JP 26779692A JP 2741140 B2 JP2741140 B2 JP 2741140B2
Authority
JP
Japan
Prior art keywords
furnace core
tuyere
furnace
scheduled
core
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.)
Expired - Lifetime
Application number
JP26779692A
Other languages
Japanese (ja)
Other versions
JPH0693319A (en
Inventor
陽三 細谷
保彦 藤原
久朗 神山
守政 一田
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
Nippon Steel Corp
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 Nippon Steel Corp filed Critical Nippon Steel Corp
Priority to JP26779692A priority Critical patent/JP2741140B2/en
Publication of JPH0693319A publication Critical patent/JPH0693319A/en
Application granted granted Critical
Publication of JP2741140B2 publication Critical patent/JP2741140B2/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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  • Manufacture Of Iron (AREA)
  • Blast Furnaces (AREA)

Description

【発明の詳細な説明】DETAILED DESCRIPTION OF THE INVENTION

【0001】[0001]

【産業上の利用分野】本発明は、予定休風毎に炉芯部状
態を測定し、変調の兆候があれば送風立ち上げ毎に炉芯
部を定常状態に復元する高炉の操業方法に関するもので
ある。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for operating a blast furnace in which the state of a furnace core is measured at every scheduled outage, and if there is a sign of modulation, the furnace core is restored to a steady state every time the blast is started. It is.

【0002】[0002]

【従来の技術】製鉄用高炉は大量の銑鉄を生産でき、し
かも熱効率が90%と高い。このため現在でも銑鉄製造
の主流を維持している。しかし高炉は、巨大な向流移動
層であるために生産性、生産弾力性等の制御性が必ずし
も良くないという弱点があり、安定した生産量、溶銑品
質の確保のためにより一層の制御性向上が望まれてい
る。高炉操業過程において好ましくない条件下での操
業、たとえば水分の高い焼結鉱とかコークス等の原料が
装入されたり、また、塊鉱石等の粉化し易い低品位の原
料が装入される場合、あるいはコークス強度が低下する
場合、また、高微粉炭比でたとえばコークス比300k
g/t以下の低コークス比でしかもO/C(鉱石/コー
クス)が5以上といった高O/C操業の場合等では、炉
芯部の通気性・通液性の確保が困難になり易い。このよ
うな場合においても、安定操業ができる制御技術の確立
が望まれている。
2. Description of the Related Art A blast furnace for steelmaking can produce a large amount of pig iron, and has a high thermal efficiency of 90%. For this reason, the mainstream of pig iron production is maintained even today. However, the blast furnace has the disadvantage that controllability such as productivity and production elasticity is not always good because it is a huge countercurrent moving bed, and further controllability is improved to ensure stable production and hot metal quality. Is desired. When operating under unfavorable conditions in the blast furnace operation process, for example, when raw materials such as high-moisture sinter or coke are charged, or when low-grade raw materials such as lump ore that are easily pulverized are charged, Alternatively, when the coke strength is reduced, or at a high pulverized coal ratio, for example, a coke ratio of 300 k
In the case of a low coke ratio of g / t or less and a high O / C operation in which the O / C (ore / coke) is 5 or more, it becomes difficult to secure the gas permeability and liquid permeability of the furnace core. Even in such a case, it is desired to establish a control technique that enables stable operation.

【0003】上記炉芯部の通気性・通液性の確保が困難
になり易い状態となった場合の従来の炉況回復制御方法
としては、たとえば特開昭63−210208号で開示
されているように、高炉内ゾンデを挿入し、検知された
情報から炉芯の活性度を判断し、その値が管理基準を超
えた場合に装入物分布、コークス比、炉熱アクション等
を変更する方法、すなわち、送風温度や燃料比を上げて
操業する方法が一般的な方法として知られている。
[0003] A conventional furnace condition recovery control method in the case where it becomes difficult to ensure the air permeability and liquid permeability of the furnace core is disclosed in, for example, Japanese Patent Application Laid-Open No. 63-210208. A method of inserting a sonde in the blast furnace, judging the activity of the furnace core from the detected information, and changing the charge distribution, coke ratio, furnace heat action, etc. when the value exceeds the control standard That is, a method of operating with an increased blast temperature or fuel ratio is known as a general method.

【0004】また、上記した炉芯部の通気性回復操作と
はその目的が異なるが、炉芯部の偏りを修正する方法と
して、高炉羽口から微粉炭、コークス粉、フェロシリコ
ン粉等の発熱性粉体を吹き込み、そのレースウェイに面
した炉芯部を溶解する方法が特開昭60−43410号
で開示されている。
Although the purpose is different from the above-mentioned operation of restoring the air permeability of the furnace core, as a method of correcting the deviation of the furnace core, heat generated from pulverized coal, coke powder, ferrosilicon powder, etc. from a blast furnace tuyere is used. Japanese Patent Application Laid-Open No. Sho 60-43410 discloses a method of blowing a conductive powder and melting a furnace core facing the raceway.

【0005】また、特開平3−260004号には、高
炉炉況悪化時、長期休風実施時において、送風開始前に
高炉羽口より加熱掘削ランスを挿入して炉芯に通気孔を
開孔し、この通気孔から炉芯内に熱風を導入する炉芯加
熱方法が提案されている。
Japanese Patent Application Laid-Open No. 3-260004 discloses that when a blast furnace condition deteriorates and a long-term shutoff is performed, a heating excavation lance is inserted from the tuyere of a blast furnace before ventilating and ventilation holes are opened in the furnace core. Then, a furnace core heating method of introducing hot air into the furnace core through the vent hole has been proposed.

【0006】[0006]

【発明が解決しようとする課題】高炉内の装入物は数時
間で炉内を通過するのに対して、炉芯部の塊コークスは
数日間を要して入れ替わるものと推定されている。炉芯
部に高温の炉内ガスが十分流れている間は炉芯部が活性
状態にあるので問題ないが、前記したように炉芯部内コ
ークス粉率上昇などで炉芯部の通気性が悪化してガスが
流れなくなると、炉芯部が冷え込むことになる。上記炉
芯部の通気性・通液性が悪化する要因は炉芯部のある特
定帯域のコークス粒度が異常に小さくなったり、コーク
ス中の灰分が滞留したり、さらには羽口部から吹き込ん
だ微粉炭から発生する未燃チャーとか灰分が炉芯表層部
に堆積した状態となっていることが考えられる。
It is estimated that the charge in the blast furnace passes through the furnace in several hours, while the coke in the core of the blast furnace changes over several days. There is no problem because the furnace core is in an active state while the high-temperature furnace gas is sufficiently flowing in the furnace core, but as described above, the permeability of the furnace core deteriorates due to an increase in the coke powder rate in the furnace core. When the gas stops flowing, the furnace core cools down. Factors that deteriorate the air permeability and liquid permeability of the furnace core part are abnormally small coke particle size in a certain zone of the furnace core part, ash in the coke stays, and furthermore, it is blown from the tuyere part. It is considered that unburned char and ash generated from pulverized coal are deposited on the surface of the furnace core.

【0007】上記のような状態において、上記特開昭6
3−210208号とか特開昭60−43410号の方
法を採用し、送風温度を高めたりあるいは発熱性粉体を
吹き込むと炉芯表層面部は高温に維持できるものの炉芯
部に熱風が安定的に供給できない限り炉芯部内温度は上
昇せず、炉芯部が入れ替わって炉況が回復するのに長時
間かかるという問題がある。
[0007] Under the above conditions, the above-mentioned Japanese Patent Application Laid-Open
When the air blowing temperature is increased or exothermic powder is blown in, the surface of the furnace core can be maintained at a high temperature, but the hot air stably flows to the furnace core by employing the method described in Japanese Patent Application Laid-Open No. 3-210208 or Japanese Patent Application Laid-Open No. 60-43410. Unless it can be supplied, the temperature inside the furnace core does not rise, and there is a problem that it takes a long time for the furnace core to be replaced and the furnace condition to be recovered.

【0008】この不活性状態の炉芯部を上記外部加熱法
より短時間に定常状態の通気性・通液性に回復させる上
記特開平3−260004号を実施する場合、炉芯部の
複数箇所の特性の測定、あるいは複数の通気孔を穿設す
る操作に相当に時間を要する。また、上記各種プローブ
の挿入操作のための駆動力は炉芯部の活性度が低下して
いる程、強力な駆動力を必要とし、また、上記各種プロ
ーブの挿入操作はその安全上、対象高炉を休風すること
となり、この間高炉の生産性は低下するという問題があ
る。
In the case of Japanese Patent Application Laid-Open No. 3-260004, in which the furnace core in the inactive state is restored to the gas permeability and liquid permeability in a steady state in a shorter time than the external heating method described above, a plurality of points in the furnace core are required. It takes a considerable amount of time to measure the characteristics of the above or to form a plurality of ventilation holes. In addition, the driving force for the operation of inserting the various probes requires a stronger driving force as the activity of the furnace core decreases, and the operation of inserting the various probes requires safety in the target blast furnace. And the productivity of the blast furnace decreases during this time.

【0009】よく知られているように、高炉設備は、た
とえば30日毎とか45日毎に定期的な予定休風を実行
している。この定期的な予定休風は高炉本体および付帯
設備の整備あるいは生産調整のために十数時間ないし2
4時間程度の休風を行なうものである。この予定休風時
の整備作業としては、たとえば装入装置、炉本体、羽口
部のメンテナンス、マッドガン、開口機等の周辺機械の
メンテナンスおよび集塵機、熱風炉等の付帯設備等のメ
ンテナンス等があり、これらの整備作業は計画通りに実
行され、休風時間を最小にして生産効率を高めることが
望まれている。
As is well known, the blast furnace equipment performs a scheduled scheduled shutoff, for example, every 30 days or every 45 days. This regular scheduled outage may take more than 10 hours or 2 hours for maintenance of the blast furnace body and incidental equipment or production adjustment.
The wind is cut off for about 4 hours. Maintenance work during this scheduled outage includes, for example, maintenance of charging equipment, furnace body and tuyere, maintenance of peripheral equipment such as mud guns and opening machines, and maintenance of incidental equipment such as dust collectors and hot blast stoves. It is desired that these maintenance works be performed as planned, and that the production efficiency be improved by minimizing the downtime.

【0010】一方、上記した炉芯部の変調は急激に発生
するものでなく、前記した原因が順次蓄積して徐々に変
調を来たすものであり、連続的あるいは定期的に炉芯部
の状況を把握し、炉況変調の兆候の段階でそれを解消す
ることが望まれている。上記したような問題を解決すべ
く本発明者等は鋭意開発を進めた結果、高炉毎に設定さ
れる定期的な予定休風毎に、高炉設備の整備作業とプロ
ーブ挿入関連操作の類似作業時間を共有することによっ
て予定休風時間の延長を解消し、炉芯部状況を把握し
て、炉芯部に変調の兆候が見られると休風後の送風立ち
上げ時に炉芯部の特定部位を積極的に内部加熱すること
によって定常操業状態への移行を短時間に達成する方法
を提供するものである。
On the other hand, the above-mentioned modulation of the core does not occur rapidly, but the above-mentioned causes are accumulated one after another and the modulation gradually occurs. It is desired to grasp and to eliminate it at the stage of signs of furnace condition modulation. As a result of the intensive development of the present inventors in order to solve the above-mentioned problems, the time required for the blast furnace facility maintenance work and the probe insertion-related operation for each of the scheduled scheduled wind breaks set for each blast furnace. The extension of the scheduled outage time is eliminated by sharing the information, and the condition of the furnace core is grasped.If there are signs of modulation in the furnace core, a specific part of the furnace core is An object of the present invention is to provide a method for achieving a transition to a steady operation state in a short time by actively heating the inside.

【0011】[0011]

【課題を解決するための手段】すなわち本発明は、高炉
炉芯部の特性を測定して炉芯部状態を判定し、炉芯部に
通気孔を設け熱風を供給して加熱するに際して、定期的
な予定休風毎に所定の複数の羽口部を介して炉芯部の特
性を測定して炉芯部状態を判定すると共に、複数の通気
孔を穿設する羽口部を設定し、休風時予定整備作業中あ
るいは休風時予定整風作業後の送風開始前10〜1時間
の範囲内に上記炉芯部の要加熱部位の近傍に、複数の通
気孔を設けることを特徴とする高炉の操業方法である。
That is, the present invention measures the characteristics of a blast furnace core to determine the state of the furnace core, and provides a vent hole in the furnace core to supply hot air for heating. The furnace core state is determined by measuring the characteristics of the furnace core through a plurality of predetermined tuyeres for each scheduled scheduled outage, and the tuyere is provided with a plurality of ventilation holes. Scheduled maintenance work during cold weather
Or a method for operating a blast furnace, wherein a plurality of ventilation holes are provided in the vicinity of a required heating portion of the furnace core within a range of 10 to 1 hour before the start of air blowing after scheduled air conditioning operation at the time of wind break. .

【0012】また本発明は、上記予定休風時の予定整備
作業の一つである羽口部整備作業と並行して、所定の複
数の羽口を介して炉芯部の特性を測定して炉芯部状態を
判定すると共に複数の通気孔を穿設する羽口を設定し、
上記羽口部整備作業終了前に当該羽口部を介して中空パ
イプを挿入して一部の炉芯構成物と共に抜き出して複数
の通気孔を穿設することを特徴とする。
[0012] The present invention also provides a scheduled maintenance during the scheduled outage.
In parallel with the tuyere maintenance work, one of the operations, the characteristics of the furnace core are measured through a plurality of predetermined tuyeres to determine the state of the furnace core, and a plurality of ventilation holes are formed. Set the tuyere,
Before completion of the tuyere maintenance work, a hollow pipe is inserted through the tuyere and extracted with some of the furnace core components to form a plurality of ventilation holes.

【0013】また本発明は、上記予定休風時毎に、特定
の3〜4箇所の羽口部を介して炉芯部の炉半径方向にそ
れぞれ2点以上の温度を測定し、各測温部位の温度差に
基づいて炉芯部状態を判定することも特徴とする。
Further, according to the present invention, at each scheduled outage, two or more temperatures are measured in the radial direction of the furnace core through three or four specific tuyeres, and each temperature is measured. It is also characterized in that the core state is determined based on the temperature difference between the parts.

【0014】[0014]

【作用】本発明は、高炉毎に定める定期的な予定休風、
たとえば30日毎とか45日毎とか60日毎という間隔
で設定する予定休風毎に、所定の複数の羽口部を介して
炉芯部の特性を測定するので、炉芯部で発生しているか
も知れない変調の兆候を、長期的な特性値の比較のもと
で現状の炉芯部状態を把握することができる。また炉芯
部の特性の測定として特定の3箇所以上の羽口部を介し
て炉芯部の半径方向にそれぞれ2点以上の温度を測定す
る方式を採用すると、測定面における温度分布として特
性を把握でき、また該温度と溶融物の粘性との関係から
炉芯部の通液性として把握できる。すなわち温度分布と
して測定するには羽口部は3箇所以上が必要であり精度
上は多い方が良いが、実施例にも述べるように時間的制
約からたとえば4箇所で測定される。
According to the present invention, there is provided a scheduled scheduled air cutoff for each blast furnace,
For example, the characteristics of the furnace core are measured through a plurality of tuyeres at predetermined scheduled outages set at intervals of every 30 days, every 45 days, every 60 days, and may occur in the furnace core. With no signs of modulation, the current state of the core can be grasped based on a long-term comparison of characteristic values. In addition, if a method of measuring the temperature at two or more points in the radial direction of the furnace core via three or more specific tuyere parts as a measurement of the characteristics of the furnace core is adopted, the characteristics can be obtained as a temperature distribution on the measurement surface. From the relationship between the temperature and the viscosity of the melt, it can be grasped as the liquid permeability of the furnace core. That is, in order to measure the temperature distribution, three or more tuyere portions are required, and the tuyere portion is preferably high in accuracy. However, as described in the embodiment, the tuyere portion is measured at, for example, four places due to time constraints.

【0015】また上記炉芯状態の把握によって、通気孔
を穿設すべき羽口部を設定するので、休風時の予定整備
作業間に通気孔を穿設する操作を実施できる。また測定
操作とは独立して通気孔を穿設するので通気に適した大
きさの孔を形成することができる。また炉芯部に形成し
た通気孔は休風状態であると長時間その原型に近い状態
で保持されるので、予定休風時間内の任意の時点で先作
りすることができる。
Further, since the tuyere where the vent is to be formed is set based on the grasp of the state of the furnace core, the operation of forming the vent can be performed during scheduled maintenance work when the air is shut off. Further, since the ventilation hole is formed independently of the measurement operation, a hole having a size suitable for ventilation can be formed. In addition, since the ventilation holes formed in the furnace core are kept in a state close to the original form for a long time in the state of the uncooled state, they can be preformed at any time within the scheduled uninterrupted time.

【0016】本発明において、休風時の予定整備作業中
あるいは休風時の予定整風作業後の送風開始前10〜1
時間の範囲内に、上記炉芯部の要加熱部位の近傍に、
の通気孔を設けるものであるが、送風開始前10時間
を越える前から通気孔を形成しておくと、炉芯部の圧力
によりコークス塊が脱落して通気孔が閉塞する場合が発
生し易い。また休風中であるが、羽口部を取り外した部
分は他の閉塞手段で塞いでいるものの、高炉シャフト部
のドラフトによって大気の流入が避けられず、炉芯部を
冷却するので適切でない。また送風開始前1時間未満と
なると通気孔の穿設後の羽口部の組立、いわゆる送風立
ち上げ準備作業が不十分となり適切でない。したがっ
て、本発明において送風開始前10〜1時間の範囲内の
予定整備作業の合間に通気孔を先作りしておくものであ
る。
In the present invention, during scheduled maintenance work during a calm
Or 10-1 before the start of ventilation after scheduled air conditioning work at the time of rest
Within the range of time, duplicate
But is intended to provide a number of vent holes, idea to form a vent hole before exceeding the start of air blowing before 10 hours, if the vent hole is closed occurs by coke lumps falling by the pressure of the furnace core section easy. Although the wind is shut off, the portion from which the tuyere is removed is closed by other closing means. However, the inflow of air is inevitable due to the draft of the blast furnace shaft, and the furnace core is not cooled. If the time is less than one hour before the start of the air supply, the tuyere assembly after the perforation of the ventilation holes, that is, the so-called air supply start-up preparation work is insufficient, which is not appropriate. Therefore, in the present invention, the ventilation holes are formed in advance between scheduled maintenance operations within a range of 10 to 1 hour before the start of the ventilation.

【0017】上記通気孔は予定休風後の送風立ち上げ操
業時に供給する熱風によって、炉芯部をその内部から燃
焼、加熱させるものであり、通気孔の径が大きいほど効
果的となる。しかし、大径の通気孔形成プローブは炉芯
部への挿入抵抗が増大し、挿入時に座屈する恐れがある
ので200mmまでとすることが好ましい。また、大径
の通気孔形成プローブの構造としては、その挿入抵抗を
軽減するために、たとえば、鋼製の中空パイプとするも
のである。この中空パイプを炉芯部に挿入すると、パイ
プ先端縁に当接するコークス塊は破砕されるがパイプの
中空部にその大部分が収容され、該中空パイプの抜き出
しにより炉芯部外に取り出されるので、良好な通気孔が
形成される。また取り出されたコークス等炉芯部構成物
は炉芯部の特性を評価する補足サンプルとすることもで
きる。
The vent hole burns and heats the furnace core from the inside by the hot air supplied during the start-up operation of the blower after a scheduled outage. The larger the diameter of the vent hole, the more effective. However, it is preferable that the diameter of the probe having a large diameter be up to 200 mm because the resistance to insertion into the furnace core increases and there is a possibility of buckling at the time of insertion. The structure of the large-diameter vent hole forming probe is, for example, a steel hollow pipe in order to reduce the insertion resistance. When this hollow pipe is inserted into the furnace core, the coke lump that abuts on the leading end of the pipe is crushed, but most of the coke is contained in the hollow part of the pipe and is taken out of the furnace core by extracting the hollow pipe. , Good air holes are formed. Further, the core component such as coke taken out can be used as a supplementary sample for evaluating the characteristics of the core.

【0018】[0018]

【実施例】以下、本発明を図面に示す実施例に基づいて
具体的に説明する。本発明は、高炉毎に予設定する予定
休風、たとえば30日毎とか45日毎とか60日毎等の
定期的な予定休風毎に、炉芯部の複数箇所の特性を測定
する。この予定休風の間隔は短いほど、長期的なデータ
が多数蓄積されるので好ましいが、休風自体が高炉の生
産効率を低下させる原因であり、生産計画および高炉設
備の予防保全計画にもとづいて特定高炉に最適な間隔を
設定することができる。
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be specifically described below based on embodiments shown in the drawings. According to the present invention, the characteristics of a plurality of portions of the core of the furnace are measured at scheduled outages that are preset for each blast furnace, for example, at scheduled outages every 30 days, 45 days, or 60 days. It is preferable to set a shorter interval between scheduled wind breaks because long-term data can be accumulated in large numbers.However, the wind break itself is a factor that reduces the production efficiency of the blast furnace, and is based on the production plan and the preventive maintenance plan for the blast furnace equipment. An optimum interval can be set for a specific blast furnace.

【0019】上記炉芯部の特性の測定法としては、図1
の高炉下部の断面図に示すような態様の公知の手段を適
用することができ、たとえば、熱電対を内装した測定用
プローブ1を羽口部5を介して直接炉芯部7に挿入して
測温する方法、鋼製の中空パイプで構成した測定用プロ
ーブ1を上記同様に炉芯部7に挿入して炉芯コークスを
採取し、そのコークスの履歴温度ならびに粉率(たとえ
ば、各測定部位における3mm以下のコークスの割合が
10%以上となると、炉芯部での通気性は悪化)を直接
測定する方法、あるいは上記コークスサンプリングと同
様に採取されたスラグの組成、たとえばAl23 /C
aOの値と高炉へ装入された平均スラグ組成Al23
/CaOと比較することにより、炉芯部の活性化度を間
接的に判定する方法、あるいは羽口部から測定用プロー
ブ1を挿入する時の挿入抵抗値から炉芯部の活性度を判
定する方法等の測定手段が採用できる。
FIG. 1 shows a method of measuring the characteristics of the furnace core.
A known means having a mode as shown in the sectional view of the lower part of the blast furnace can be applied. For example, the measuring probe 1 having a thermocouple built therein is inserted directly into the furnace core 7 through the tuyere 5. A method for measuring the temperature, the probe 1 for measurement constituted by a hollow pipe made of steel is inserted into the furnace core 7 in the same manner as described above to collect the furnace core coke, and the history temperature and powder rate of the coke (for example, each measurement site) If the proportion of coke of 3 mm or less in the above becomes 10% or more, the air permeability in the furnace core deteriorates), or the composition of slag collected in the same manner as in the above coke sampling, for example, Al 2 O 3 / C
The value of aO and the average slag composition Al 2 O 3 charged into the blast furnace
A method of indirectly determining the degree of activation of the furnace core by comparing with / CaO, or determining the activity of the furnace core from the insertion resistance value when the measurement probe 1 is inserted from the tuyere. A measuring means such as a method can be adopted.

【0020】図1においては、1は測定用プローブ、2
は測定用プローブ1の押し込み装置、3は熱風を羽口に
供給する環状管、4は送風支管、5は羽口で、この送風
支管4と羽口5との間には点線で示しているように、ブ
ローパイプ6が配置されているものであり、測定用プロ
ーブ1を炉芯部7内へ挿入するに際しては取り外してい
る。なお、大径の測定用プローブ1を用いる場合には、
羽口5も取り外すものである。
In FIG. 1, 1 is a measuring probe, 2
Is a push-in device for the measurement probe 1, 3 is an annular tube for supplying hot air to the tuyere, 4 is a blower branch, 5 is a tuyere, and a dotted line between the blower branch 4 and the tuyere 5 is shown. As described above, the blow pipe 6 is disposed, and is removed when the measurement probe 1 is inserted into the furnace core 7. When using a large-diameter measuring probe 1,
The tuyere 5 is also removed.

【0021】上記炉芯部の特性の測定に際しては、1個
の羽口部の取り外しおよび取付け作業に20〜30分を
要するが、前記したように本発明は、予定休風時の羽口
整備作業において、整備対象の羽口部のブローパイプ6
を取り外すと共に、整備対象外であるが測定対象である
羽口部のブローパイプ6を取り外しておき、また各羽口
部を組み立てるまでの間に測定用プローブ1の挿入、測
定操作を実行することにより一つの羽口での所要時間は
約5分で実施できる。また、2台の押し込み装置2を用
いると、該装置2の移動設置に要する時間約10分を含
めて約20分で4箇所の羽口部からの測定が実施でき
る。
In measuring the characteristics of the furnace core, it takes 20 to 30 minutes to remove and attach one tuyere. However, as described above, the present invention provides a tuyere In the operation, the blow pipe 6 at the tuyere
, The blowpipe 6 of the tuyere, which is not a maintenance target but is a measurement target, is removed, and the measuring probe 1 is inserted and the measurement operation is performed until each tuyere is assembled. Therefore, the time required for one tuyere can be reduced to about 5 minutes. In addition, when two pushing devices 2 are used, measurement from four tuyere portions can be performed in about 20 minutes including the time required for moving and installing the devices 2 in about 10 minutes.

【0022】上記羽口部の特性の測定において、測温法
を採用する場合であると、予定休風毎の測定対象羽口部
3〜4箇所を特定して毎回その羽口部で測定し、しかも
測温法としては先端に鋼製キャップを設けた測定用プロ
ーブを一定深さまで挿入した後、測定用プローブを後退
させて先端のキャップを脱落させその位置で測温後、再
度一定距離後退させた位置で測温するという、炉芯部の
半径方向で2点以上の測温を行い、各羽口部での各点の
測温値で温度分布を把握すると共に前回以前の温度分布
との比較で推移傾向を合わせて評価することができる。
In the case of employing the temperature measurement method in the measurement of the characteristics of the tuyere, the tuyere to be measured is specified at three to four locations for each scheduled outage and the tuyere is measured each time. In addition, as a temperature measuring method, after inserting a measuring probe with a steel cap at the tip to a certain depth, retract the measuring probe to drop the tip cap, measure the temperature at that position, and then retreat a certain distance again. Measure the temperature at two or more points in the radial direction of the furnace core, that is, measure the temperature at the position where it was set, and grasp the temperature distribution by measuring the temperature at each point at each tuyere and Can be evaluated together with the transition tendency.

【0023】図2は高炉羽口部の4方向から、外径60
mmの測温プローブを挿入し、炉芯部の温度を測定する
場合で(a)図は測定点を(b)図は測定結果を示して
いる。羽口先端1.5mから3mの位置の温度を測定範
囲とし、今回は2mと2.5mの位置の温度((b)図
点線A)を測定した。上記測温操作に際しては、まず、
羽口部の整備作業として対象羽口部のブローパイプ6
(図1)と測温対象羽口部のブローパイプ6を取り外し
た直後に2台の押し込み装置2を用いて測温プローブ1
を炉芯部に挿入、測温した。図3は高炉解体結果にもと
づく炉芯温度とスラグ粘度の関係を示すグラフである
が、上記測温結果から、たとえば、測温値が1400℃
以下になると溶滓の推定粘度が10ポイズ以上となるの
で炉芯部での通液性は低下していると判定できる。ま
た、各部位の測温値の比較によって不活性域の範囲を推
定することができる。
FIG. 2 shows an outer diameter of 60 from the four directions of the blast furnace tuyere.
(a) shows a measurement point and (b) shows a measurement result when a temperature measuring probe of mm is inserted to measure the temperature of the furnace core. The temperature at the position of 1.5 m to 3 m from the tuyere tip was taken as the measurement range, and the temperature at the position of 2 m and 2.5 m (dotted line A in (b)) was measured this time. In the above temperature measurement operation, first,
Blowpipe 6 of the target tuyere as maintenance work of the tuyere
(FIG. 1) and immediately after removing the blowpipe 6 at the tuyere of the temperature measurement target, the temperature measurement probe 1 using two pushing devices 2.
Was inserted into the furnace core and the temperature was measured. FIG. 3 is a graph showing the relationship between the core temperature and the slag viscosity based on the blast furnace dismantling results. From the above temperature measurement results, for example, a temperature measurement value of 1400 ° C.
Below this, the estimated viscosity of the slag becomes 10 poise or more, so that it can be determined that the liquid permeability at the furnace core is reduced. Further, the range of the inactive region can be estimated by comparing the temperature measurement values of the respective parts.

【0024】上記炉芯部状態をもとに、No.1とN
o.2羽口部(図2(a))の炉芯部に通気孔を穿設す
ると判定し、羽口部整備作業において特定羽口の交換時
にNo.1とNo.2の羽口を取り外した。整備作業休
憩時にNo.1、No.2羽口部に200mm径の鋼製
中空パイプを上記押し込み装置2を用いて炉芯部に4m
挿入し、当該部位の炉芯部構成物を抜き出す態様で通気
孔を形成した。9時間後に整備作業が完了し、送風立ち
上げ、通常操業を行なった過程で特に異常は認められ
ず、1ヵ月後の予定休風時に同一羽口について上記同様
の測温をした結果は図2(b)の実線Bに示すように、
各羽口部に対応する炉芯温度は1400℃以上に改善さ
れており、炉芯部は活性状態にあると判定できた。
On the basis of the state of the furnace core, No. 1 and N
o. It is determined that a vent hole is to be formed in the core of the two tuyere portions (FIG. 2A). 1 and No. The tuyere of No. 2 was removed. No. during maintenance work break. 1, No. A steel hollow pipe having a diameter of 200 mm was inserted into the two tuyere portions with a diameter of 4 m in the furnace core using the pushing device 2.
A vent was formed by inserting and extracting the core component at the site. After 9 hours, the maintenance work was completed, the ventilation was started, and normal operation was performed. No abnormalities were observed, and the same tuyere was measured for the same tuyere at the scheduled shutoff one month later. As shown by the solid line B in (b),
The core temperature corresponding to each tuyere was improved to 1400 ° C. or higher, and it was determined that the core was in an active state.

【0025】[0025]

【発明の効果】本発明によれば、高炉操業において予定
休風毎に複数箇所の炉芯特性を測定し、その測定結果で
炉芯部状況を把握すると共に変調の兆候が予測されると
炉芯部の内部加熱に適した大きさの通気孔を、休風時の
予定整備作業の合間に先作りするので、予定整備作業の
ための休風時間を実質的に延長することなく実施でき、
送風立ち上げ時の熱風によって炉芯部の内部からコーク
スを燃焼させるので、高炉炉芯部を速やかに活性化させ
ることが可能になる。したがって本発明法を実施すれ
ば、従来のような長時間にわたって燃料比を高くする操
業を継続したり、炉況を早期に立て直せないために出銑
量を長時間十分に確保できないような問題は完全に解消
できる。また、高微粉炭比操業(微粉炭比200kg/
t)のように炉芯内での通気性・通液性の確保が困難に
なりやすい場合においても、安定操業を維持することが
できる。
According to the present invention, in the blast furnace operation, the core characteristics at a plurality of locations are measured at each scheduled outage and the furnace core state is grasped based on the measurement results, and when a sign of modulation is predicted, Since ventilation holes of a size suitable for internal heating of the core are created in advance of scheduled maintenance work at the time of wind break, it can be implemented without substantially extending the wind down time for scheduled maintenance work,
Since the coke is burned from the inside of the furnace core by the hot air at the time of starting the blowing, the blast furnace core can be quickly activated. Therefore, if the method of the present invention is carried out, problems such as the conventional operation of increasing the fuel ratio over a long period of time and the problem of not being able to secure a sufficient amount of tapping for a long period of time because the furnace condition cannot be re-established at an early stage are as follows. It can be completely eliminated. In addition, high pulverized coal ratio operation (pulverized coal ratio 200kg /
Even in the case where it is difficult to ensure the air permeability and liquid permeability in the furnace core as in t), stable operation can be maintained.

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

【図1】本発明の炉芯部の特性の測定態様の概要説明図FIG. 1 is a schematic explanatory view of a mode of measuring the characteristics of a furnace core according to the present invention.

【図2】(a)は高炉円周方向複数箇所の炉芯温度測定
点を示す図で、(b)はその測定結果を示すグラフ
FIG. 2 (a) is a diagram showing core temperature measurement points at a plurality of locations in the circumferential direction of a blast furnace, and FIG. 2 (b) is a graph showing the measurement results.

【図3】炉芯温度とスラグ粘度の関係を示すグラフFIG. 3 is a graph showing the relationship between core temperature and slag viscosity.

【符号の説明】[Explanation of symbols]

1 測定用プローブ 2 押し込み装置 3 環状管 4 送風支管 5 羽口 6 ブローパイプ 7 炉芯部 DESCRIPTION OF SYMBOLS 1 Measuring probe 2 Push-in device 3 Annular pipe 4 Ventilation branch pipe 5 Tuyere 6 Blow pipe 7 Furnace core

Claims (3)

(57)【特許請求の範囲】(57) [Claims] 【請求項1】 高炉炉芯部の特性を測定して炉芯部状態
を判定し、炉芯部に通気孔を設け熱風を供給して加熱す
るに際して、定期的な予定休風毎に所定の複数の羽口部
を介して炉芯部の特性を測定して炉芯部状態を判定する
と共に、複数の通気孔を穿設する羽口を設定し、休風時
予定整備作業中あるいは休風時予定整風作業後の送風開
始前10〜1時間の範囲内に上記炉芯部の要加熱部位の
近傍に複数の通気孔を設けることを特徴とする高炉の操
業方法。
1. A furnace core state is determined by measuring characteristics of a blast furnace core part. When a vent hole is provided in the furnace core part and hot air is supplied to heat the furnace core part, a predetermined time is set for each scheduled scheduled outage. together determine the furnace core state by measuring the characteristics of the furnace core through a plurality of tuyere sets the tuyere drilling a plurality of vent holes, Kyufuji
A method for operating a blast furnace, wherein a plurality of ventilation holes are provided in the range of 10 to 1 hour before the start of air blowing during scheduled maintenance work or after scheduled air conditioning work after a scheduled wind break in the vicinity of the required heating portion of the furnace core. .
【請求項2】 予定休風時の予定整備作業の一つである
羽口部整備作業と並行して、所定の複数の羽口を介して
炉芯部の特性を測定して炉芯部状態を判定すると共に複
数の通気孔を穿設する羽口を設定し、上記羽口部整備作
業終了前に当該羽口部を介して中空パイプを挿入して一
部の炉芯構成物と共に抜き出して複数の通気孔を穿設す
ることを特徴とする請求項1記載の高炉の操業方法。
2. In parallel with the tuyere part maintenance operation, which is one of the scheduled maintenance operations during a scheduled outage, the characteristics of the furnace core are measured through a plurality of predetermined tuyeres. A tuyere for judging the state of the furnace core and setting a plurality of vent holes is set, and a hollow pipe is inserted through the tuyere before completion of the tuyere maintenance work to partially configure the core. The method for operating a blast furnace according to claim 1, wherein a plurality of ventilation holes are formed by extracting the ventilation holes together with the objects.
【請求項3】 予定休風時毎に、特定の3箇所以上の羽
口部を介して炉芯部の炉半径方向にそれぞれ2点以上の
温度を測定し、各測温部位の温度差に基づいて炉芯部状
態を判定することを特徴とする請求項1または2記載の
高炉の操業方法。
3. At each scheduled outage, two or more temperatures are measured in the furnace radial direction of the furnace core through three or more specific tuyere portions, and the temperature difference between the respective temperature measurement parts is measured. 3. The method for operating a blast furnace according to claim 1, wherein the state of the furnace core is determined based on the condition.
JP26779692A 1992-09-11 1992-09-11 Blast furnace operation method Expired - Lifetime JP2741140B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP26779692A JP2741140B2 (en) 1992-09-11 1992-09-11 Blast furnace operation method

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP26779692A JP2741140B2 (en) 1992-09-11 1992-09-11 Blast furnace operation method

Publications (2)

Publication Number Publication Date
JPH0693319A JPH0693319A (en) 1994-04-05
JP2741140B2 true JP2741140B2 (en) 1998-04-15

Family

ID=17449719

Family Applications (1)

Application Number Title Priority Date Filing Date
JP26779692A Expired - Lifetime JP2741140B2 (en) 1992-09-11 1992-09-11 Blast furnace operation method

Country Status (1)

Country Link
JP (1) JP2741140B2 (en)

Also Published As

Publication number Publication date
JPH0693319A (en) 1994-04-05

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