JP7196967B1 - Method for estimating deposit shape of filler in blast furnace and method for replacing coke in blast furnace - Google Patents
Method for estimating deposit shape of filler in blast furnace and method for replacing coke in blast furnace Download PDFInfo
- Publication number
- JP7196967B1 JP7196967B1 JP2021132661A JP2021132661A JP7196967B1 JP 7196967 B1 JP7196967 B1 JP 7196967B1 JP 2021132661 A JP2021132661 A JP 2021132661A JP 2021132661 A JP2021132661 A JP 2021132661A JP 7196967 B1 JP7196967 B1 JP 7196967B1
- Authority
- JP
- Japan
- Prior art keywords
- furnace
- coke
- estimating
- shape
- filling
- 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.)
- Active
Links
- 239000000571 coke Substances 0.000 title claims abstract description 128
- 238000000034 method Methods 0.000 title claims abstract description 58
- 239000000945 filler Substances 0.000 title abstract description 6
- 230000008021 deposition Effects 0.000 claims abstract description 39
- 230000009467 reduction Effects 0.000 claims abstract description 20
- 239000000463 material Substances 0.000 claims abstract description 13
- 238000010079 rubber tapping Methods 0.000 claims abstract description 5
- 230000002829 reductive effect Effects 0.000 abstract description 12
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 17
- 239000002994 raw material Substances 0.000 description 11
- 238000001816 cooling Methods 0.000 description 9
- 239000007789 gas Substances 0.000 description 9
- 230000008859 change Effects 0.000 description 8
- 229910052742 iron Inorganic materials 0.000 description 8
- 239000002184 metal Substances 0.000 description 8
- 229910052751 metal Inorganic materials 0.000 description 8
- 239000002893 slag Substances 0.000 description 8
- 238000007664 blowing Methods 0.000 description 7
- 239000003638 chemical reducing agent Substances 0.000 description 7
- 239000000567 combustion gas Substances 0.000 description 7
- 238000010586 diagram Methods 0.000 description 7
- 238000006243 chemical reaction Methods 0.000 description 6
- 239000007788 liquid Substances 0.000 description 6
- 230000035699 permeability Effects 0.000 description 5
- 238000009423 ventilation Methods 0.000 description 5
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 4
- 239000001301 oxygen Substances 0.000 description 4
- 229910052760 oxygen Inorganic materials 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- 230000000116 mitigating effect Effects 0.000 description 3
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 2
- 230000006399 behavior Effects 0.000 description 2
- 239000003245 coal Substances 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 230000006866 deterioration Effects 0.000 description 2
- 230000005059 dormancy Effects 0.000 description 2
- 230000003628 erosive effect Effects 0.000 description 2
- 229910052739 hydrogen Inorganic materials 0.000 description 2
- 230000007774 longterm Effects 0.000 description 2
- 230000008018 melting Effects 0.000 description 2
- 238000002844 melting Methods 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 238000007711 solidification Methods 0.000 description 2
- 230000008023 solidification Effects 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- 229910000805 Pig iron Inorganic materials 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 238000005273 aeration Methods 0.000 description 1
- 239000003570 air Substances 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 125000004432 carbon atom Chemical group C* 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 239000002803 fossil fuel Substances 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 239000012943 hotmelt Substances 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 125000004435 hydrogen atom Chemical group [H]* 0.000 description 1
- 238000003475 lamination Methods 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000003345 natural gas Substances 0.000 description 1
- 239000008188 pellet Substances 0.000 description 1
- 239000011819 refractory material Substances 0.000 description 1
- 230000008439 repair process Effects 0.000 description 1
- 230000000284 resting effect Effects 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
- 239000002341 toxic gas Substances 0.000 description 1
Images
Classifications
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B5/00—Making pig-iron in the blast furnace
- C21B5/008—Composition or distribution of the charge
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B5/00—Making pig-iron in the blast furnace
- C21B5/006—Automatically controlling the process
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B5/00—Making pig-iron in the blast furnace
- C21B5/007—Conditions of the cokes or characterised by the cokes used
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B7/00—Blast furnaces
- C21B7/24—Test rods or other checking devices
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B2300/00—Process aspects
- C21B2300/04—Modeling of the process, e.g. for control purposes; CII
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Manufacture Of Iron (AREA)
- Blast Furnaces (AREA)
Abstract
【課題】減尺休風中の高炉において、高炉の立上げを行う際に、バーナーを用いて炉内コークスを消費した後の炉内充填物の堆積形状の推定方法を提供する。【解決手段】高炉炉内充填物の堆積形状の推定方法は、減尺休風中の高炉において、高炉の立上げを行う際に、該高炉の出銑孔からバーナーを炉内に挿入し、前記バーナーを用いて炉内コークスを消費した後の炉内充填物の堆積形状を推定するものであり、減尺休風中の炉内充填物の堆積形状を推定する工程と、前記工程で推定された炉内充填物の堆積形状と、炉内底部の凝固層の形状から、炉内コークスの充填領域を推定する工程と、前記バーナーを用いて消費される炉内コークス量を推定する工程と、前記炉内コークス量から炉内コークス消費後の炉内充填物の堆積形状を推定する工程と、を有する。【選択図】なしA method for estimating the shape of a deposit of a furnace filler after consuming coke in the furnace using a burner when the blast furnace is started up during a wind reduction shutdown. SOLUTION: A method for estimating the piled shape of filling material in a blast furnace includes inserting a burner into the furnace from a tapping hole of the blast furnace when the blast furnace is started up in a blast furnace under reduced wind, and The deposition shape of the furnace filling after consuming the coke in the furnace using the burner is estimated, and a step of estimating the deposition shape of the furnace filling during the reduction break and estimating in the above step A step of estimating a filling area of coke in the furnace from the deposited shape of the in-furnace filling and the shape of the solidified layer at the bottom of the furnace, and a step of estimating the amount of in-furnace coke consumed using the burner. and estimating the deposition shape of the in-furnace filling after consuming the in-furnace coke from the in-furnace coke amount. [Selection figure] None
Description
本発明は、高炉炉内充填物の堆積形状の推定方法および高炉炉内コークスの置換方法に関する。 TECHNICAL FIELD The present invention relates to a method for estimating a pile shape of blast furnace filler material and a method for replacing coke in a blast furnace.
高炉では、炉頂から鉄鉱石やコークスを装入し、炉下部に設けられた羽口から高温の空気を吹込み、出銑孔から溶銑滓を排出するといった操業を行っている。羽口先で生成した高温のＣＯ、Ｈ２といった還元性ガスが炉内を上昇する過程で、炉内を降下する鉄鉱石を昇温、還元、溶融することで、溶銑が製造される。定常操業時は炉内に高温空気を送風し続けるが、炉体の補修や操業トラブル対応等、非定常な事象に起因して一時的に高炉への送風を停止する、休風と呼ばれる措置をとることがある。このような場合、炉体からの抜熱や、羽口からの空気吸引に起因して炉内充填物の温度は低下する。 Blast furnaces are operated by charging iron ore and coke from the top of the furnace, blowing high-temperature air through tuyeres at the bottom of the furnace, and discharging molten iron slag from the taphole. Hot metal is produced by heating, reducing, and melting the iron ore descending in the furnace while the high - temperature reducing gases such as CO and H2 generated at the tuyere tip rise in the furnace. During normal operation, high-temperature air continues to be blown into the furnace. I may take In such a case, the temperature of the in-furnace filling drops due to heat extraction from the furnace body and air suction from the tuyeres.
炉内の温度が低下すると、炉内溶融物は粘性上昇、さらには凝固するため、出銑孔からの排出が難しくなっていく。そのような状況で羽口から送風を行うと、還元溶融した溶銑滓が排出されないため炉下部における滞留量が増加する。滴下した溶銑滓による炉下部の昇温に伴い排出可能となることもあるが、温度上昇が不十分な場合は溶銑滓を排出しにくい状況が続き、溶銑滓滞留量がさらに増加する。滞留量の著しい増加により溶銑滓レベルが羽口に到達すると、羽口の溶損や、送風管の閉塞等のトラブルを引き起こす。そのような場合、炉内への送風が不可能となることから炉内への入熱がなくなり、炉冷事故に至る。 When the temperature inside the furnace drops, the melt inside the furnace becomes more viscous and solidifies, making it difficult to discharge from the tap hole. If air is blown from the tuyeres in such a situation, the amount of stagnation in the lower part of the furnace increases because the molten iron slag that has been reduced and melted is not discharged. In some cases, the hot metal slag can be discharged as the temperature rises in the lower part of the furnace due to dripping hot metal slag. When the hot metal slag level reaches the tuyeres due to a significant increase in the retention amount, troubles such as erosion of the tuyeres and clogging of blower pipes are caused. In such a case, since the air cannot be blown into the furnace, heat input into the furnace is lost, leading to a furnace cooling accident.
ここで炉冷事故とは、高炉炉内の熱レベルが著しく低下して出銑孔からの溶銑滓排出が不可能となり、定常操業の継続が困難となることを指す。このような事故の際は、次のような手段で炉況の回復を図る。すなわち、ある１つの出銑孔とその直上の羽口の間の凝固物を酸素吹き付け等の手法で溶融排出して、溶融物の出口を確保してから、前記出銑孔と前記直上羽口２～３本の送風を行い、生成した溶融物をもって周囲の凝固層を徐々に融解しながら使用出銑孔、羽口数を定常操業に近づけていく。炉冷事故から定常操業への復帰には通例２～３か月かかるため、当然その間は溶銑製造量が著しく減少する。そのほか、復帰作業の過程で作業者が高温溶融物や有毒ガスにさらされる危険性も高い。そのため、炉冷事故は経済的にも安全的にも損失・リスクの非常に大きな操業上のトラブルであるといえる。 Here, the furnace cooling accident means that the heat level in the blast furnace furnace is so low that the hot metal slag cannot be discharged from the tap hole, making it difficult to continue the steady operation. In the event of such an accident, the following measures will be taken to restore the reactor condition. That is, the solidified material between a certain taphole and the tuyere directly above it is melted and discharged by a method such as oxygen blowing, and after securing the exit of the melted material, the taphole and the directly above tuyere are melted and discharged. Two to three air blasts are blown, and the tapholes and the number of tuyeres to be used are brought closer to the normal operation while gradually melting the surrounding solidified layer with the generated melt. Since it usually takes 2 to 3 months to return to normal operation after a furnace cooling accident, the amount of hot metal produced naturally decreases significantly during that time. In addition, there is a high risk of workers being exposed to hot melts and toxic gases during the restoration process. Therefore, it can be said that a furnace cooling accident is an operational trouble with a very large loss and risk both economically and safely.
前述の通り、休風からの立上げ操業時は炉内の熱レベルが低いため、前記炉冷事故に至るリスクが高まる。そのため、従来は休風前にコークス比を上げて炉内の熱レベルを高めておき、炉冷事故へ至るリスクを低減させてきた。しかし、休風期間が長くなるにつれて、次第にコークス比増による熱補償では熱レベルを維持できなくなる。そのような場合、図１のように、炉内充填物を、コークス比の高い条件で高炉朝顔部上端～羽口レベルまで減容してから休風し、休風からの立上げ前に再びコークス比の高い条件で原料を装入してから炉内への送風を再開するといった方法がとられる。このような休風は減尺休風と呼ばれる。減尺休風は、大規模な設備補修や高炉操業の長期休止の際に実施されるが、通常の休風に比して長い期間の休風となり、立上げ時の炉冷リスクは一層高くなる。 As described above, since the heat level in the furnace is low during the start-up operation from the wind break, the risk of the above-mentioned furnace cooling accident increases. Therefore, conventionally, the heat level in the furnace has been increased by increasing the coke ratio before the wind break, thereby reducing the risk of furnace cooling accidents. However, as the rest period becomes longer, the heat level cannot be maintained by heat compensation by increasing the coke ratio. In such a case, as shown in Fig. 1, the furnace filling is reduced in volume from the top of the blast furnace bosh to the tuyere level under conditions of a high coke ratio, then the air is rested, and before starting up from the rest, again A method of resuming air blowing into the furnace after charging the raw material under conditions of a high coke ratio is adopted. Such a dormancy is called a reduced dormancy. A reduced wind break is carried out during large-scale equipment repairs and long-term suspension of blast furnace operations, but it is a longer wind break than a normal wind break, and the risk of furnace cooling during startup is even higher. Become.
こういった休風、あるいは減尺休風時の炉冷リスクを低下させる手段として、図１のように、送風前に出銑孔にバーナーを挿入して酸素や燃料を吹き込み、羽口～出銑孔間の熱レベルを十分に引き上げてから送風を開始する方法が提案されている（特許文献１）。また、炉下部の通気通液性を向上させるために、炉下部の粉化・強度低下したコークス（劣化コークス）を一部燃焼除去し、新しいコークスに置換する、といった方法も提案されている（特許文献２）。 As a means to reduce the risk of furnace cooling during this kind of wind break or reduced wind break, as shown in Fig. 1, a burner is inserted into the tap hole before blowing air, and oxygen and fuel are blown in from the tuyere to the outlet. A method has been proposed in which air blowing is started after the heat level between the iron holes is sufficiently raised (Patent Document 1). In addition, in order to improve the aeration and liquid permeability of the lower part of the furnace, a method has been proposed in which part of the pulverized and weakened coke (deteriorated coke) in the lower part of the furnace is burned off and replaced with new coke ( Patent document 2).
特許文献１に記載の手法は、高炉炉下部の熱レベルを向上させるために有効であるが、炉冷事故のリスク低減という目的から考えると、同時に特許文献２に記載のような、粉化・強度低下した劣化コークスを新しいコークスに置換する手法を併用することで、より一層の炉下部の通気通液性を確保でき、炉冷事故のリスクを低減できると考えられる。ただし、前記劣化コークスの置換を行う場合、特許文献２に記載の手法では、劣化コークスの周囲に存在するコークスが荷下がりするに過ぎないため、必ずしも処置前に存在したコークスよりも性状の良好なコークスに置換されるとは言い切れない。さらに、炉下部の一部のコークスを中途半端に消費することにより、その上部の充填物が局所的に降下し、その後装入される原料の積層構造が不均一になるため、炉上部の通気性悪化や原料の還元不良などの操業への悪影響の顕現が懸念される。
The method described in
本発明は、減尺休風中の高炉において、高炉の立上げを行う際に、バーナーを用いて炉内コークスを消費した後の炉内充填物の堆積形状の推定方法を提供することを目的とする。 An object of the present invention is to provide a method for estimating the shape of the deposits of the furnace filling after consuming the coke in the furnace using a burner when starting up the blast furnace during the downtime and wind reduction. and
また、本発明は、前記推定方法を用いた高炉炉内コークスの置換方法を提供することを目的とする。 Another object of the present invention is to provide a method for replacing coke in a blast furnace using the estimation method.
本発明は、以下の構成を有する。
［１］減尺休風中の高炉において、高炉の立上げを行う際に、該高炉の出銑孔からバーナーを炉内に挿入し、前記バーナーを用いて炉内コークスを消費した後の炉内充填物の堆積形状を推定する高炉炉内充填物の堆積形状の推定方法であって、
減尺休風中の炉内充填物の堆積形状を推定する工程と、
前記工程で推定された炉内充填物の堆積形状と、炉内底部の凝固層の形状から、炉内コークスの充填領域を推定する工程と、
前記バーナーを用いて消費される炉内コークス量を推定する工程と、
前記炉内コークス量から炉内コークス消費後の炉内充填物の堆積形状を推定する工程と、
を有する、高炉炉内充填物の堆積形状の推定方法。
［２］前記［１］に記載の高炉炉内充填物の堆積形状の推定方法を用いた高炉炉内コークスの置換方法であって、
前記減尺休風中の炉内充填物の堆積形状と、前記炉内コークス消費後の炉内充填物の堆積形状の変化を抑制するように高炉炉内にコークスを充填する、高炉炉内コークスの置換方法。
The present invention has the following configurations.
[1] In a blast furnace that is in a reduced wind break, when starting up the blast furnace, a burner is inserted into the furnace from the tapping hole of the blast furnace, and the coke in the furnace is consumed using the burner. A method for estimating a pile shape of a blast furnace filling material for estimating a pile shape of the internal filling material,
A step of estimating the deposition shape of the furnace filling during the reduction break;
A step of estimating a furnace coke filling area from the accumulated shape of the furnace filling estimated in the above step and the shape of the solidified layer at the bottom of the furnace;
estimating the amount of in-furnace coke consumed using the burner;
A step of estimating the deposition shape of the furnace filling after consuming the furnace coke from the furnace coke amount;
A method for estimating a pile shape of a blast furnace filling material.
[2] A method for replacing coke in a blast furnace furnace using the method for estimating the pile shape of the filling in the blast furnace according to [1] above,
Coke in the blast furnace furnace, which fills the blast furnace furnace with coke so as to suppress changes in the deposition shape of the furnace filling during the reduction rest and the deposition shape of the furnace filling after the consumption of the in-furnace coke. replacement method.
本発明によれば、減尺休風中の高炉において、高炉の立上げを行う際に、バーナーを用いて炉内コークス（劣化コークス）を消費した後の炉内充填物の堆積形状を推定できる。 According to the present invention, it is possible to estimate the deposition shape of the in-furnace filling after consuming the in-furnace coke (deteriorated coke) using the burner when starting up the blast furnace in the blast furnace during the downtime. .
本発明によれば、劣化コークス消費に伴う炉内充填物の堆積形状の変化を推定し、その推定結果を参照して高炉炉内にコークスを充填することで、高炉炉内コークス置換に伴う炉内充填物の堆積形状の変化を緩和しながら、減尺休風中の炉内コークス（劣化コークス）を新しいコークスに置換して炉下部の通気、通液性を向上させることができるようになり、休風状態の高炉を安定的に定常操業状態まで立ち上げることができるようになった。 According to the present invention, by estimating the change in the deposition shape of the furnace filling accompanying the consumption of deteriorated coke and filling the blast furnace with coke with reference to the estimation result, the furnace accompanying coke replacement in the blast furnace While mitigating changes in the piled-up shape of the inner filler, it is now possible to replace the coke (degraded coke) in the furnace during the reduction and breakage with new coke to improve ventilation and liquid permeability in the lower part of the furnace. , it became possible to stably start up a blast furnace in a dormant state to a steady operating state.
本発明は、高炉において実施されるものである。高炉とは、鉄鉱石や焼結鉱などの酸化鉄を含む主原料と、コークスをはじめとした炭素や水素を含む還元材を用いて溶銑を製造する工業炉を指す。炉頂から主原料と還元材を層状に装入し、羽口部から酸素を含む熱風と、微粉炭をはじめとした還元材を炉内に送り、羽口近傍で還元材がガス化することで生成したＣＯやＨ２が炉上部へ流通する過程で、炉頂から装入された主原料を昇温、還元、溶融し、溶銑が生成される。生成された溶銑は炉内を滴下して炉床部に溜まり、高炉下部側面に設置された出銑孔から炉外へ排出される。高炉の内容積や、原料装入機構、羽口の本数等、高炉の設備設計は炉体ごとに異なることが多いが、本発明は前記設備設計の差異にかかわらず適用できるものである。
The present invention is implemented in a blast furnace. A blast furnace is an industrial furnace that produces hot metal using main raw materials containing iron oxide such as iron ore and sintered ore and reducing agents containing carbon and hydrogen such as coke. The main raw material and reducing agent are charged in layers from the top of the furnace, hot air containing oxygen and reducing agents such as pulverized coal are sent into the furnace from the tuyeres, and the reducing agents are gasified near the tuyeres. In the process where the CO and H 2 generated in
また、高炉操業では、炉頂から装入される主原料や還元材、羽口部から吹込まれる還元材として様々なものを用いる。主原料としては鉄鉱石、焼結鉱、ペレット、スクラップ、還元鉄などが、炉頂から装入する還元材としては塊コークスやそれよりも小さい小粒コークス、フェロコークスなどが、羽口部から吹込まれる還元材としては微粉炭、粉コークス、プラスチック、天然ガスをはじめとした炭素原子や水素原子の少なくともどちらか一方を含む可燃性ガス、液体化石燃料などが考えられるが、本発明は使用する前記原料や還元材の種類にかかわらず適用できるものである。 In blast furnace operation, various materials are used as main raw materials and reducing agents charged from the top of the furnace and reducing agents injected from the tuyeres. The main raw materials are iron ore, sintered ore, pellets, scrap, and reduced iron. As the reducing material to be introduced, pulverized coal, coke fine, plastic, combustible gas containing at least one of carbon atoms and hydrogen atoms such as natural gas, liquid fossil fuel, etc. can be considered, but the present invention uses It can be applied regardless of the types of raw materials and reducing agents.
本発明では、減尺休風中の高炉炉内充填物の堆積形状（以後、初期堆積形状ともいう）、炉内底部の凝固層の形状（凝固層形状）、炉内コークス（劣化コークス）の消費挙動、劣化コークス消費後の炉内充填物の堆積形状を推定することで、劣化コークス消費前後における炉内充填物の堆積形状変化を推定できることを見出した。また、前記堆積形状変化の推定結果に基づいて新たに充填するコークスの量や充填位置を適宜決定することで、減尺休風中に炉内に充填されていたコークスと、減尺休風から立ち上げる際に新たに充填するコークスの置換前後での炉内充填物の堆積形状変化を抑制することができることを見出した。 In the present invention, the deposition shape (hereinafter also referred to as the initial deposition shape) of the filling in the blast furnace furnace during the reduction break, the shape of the solidified layer at the bottom of the furnace (solidified layer shape), and the coke in the furnace (deteriorated coke). By estimating the consumption behavior and the pile shape of the furnace filling after the consumption of deteriorated coke, it was found that the change in the pile shape of the furnace filler before and after consumption of deteriorated coke can be estimated. In addition, by appropriately determining the amount of coke to be newly filled and the filling position based on the estimation result of the change in pile shape, the coke that was filled in the furnace during the reduced wind and the It was found that it is possible to suppress the change in the piled shape of the furnace filling before and after the replacement of coke that is newly filled at the time of start-up.
＜高炉炉内充填物の堆積形状の推定方法＞
本発明の高炉炉内充填物の堆積形状の推定方法は、減尺休風中の炉内充填物の堆積形状を推定する工程と、前記工程で推定された炉内充填物の堆積形状と、炉内底部の凝固層の形状から、炉内コークスの充填領域を推定する工程と、バーナーを用いて消費される炉内コークス量を推定する工程と、前記炉内コークス量から炉内コークス消費後の炉内充填物の堆積形状を推定する工程と、を有する。
<Method for estimating pile shape of blast furnace filler>
The method for estimating the piled shape of the blast furnace filling of the present invention includes a step of estimating the piled shape of the furnace filling during the reduction break, the piled shape of the furnace filling estimated in the above step, A step of estimating a filling area of coke in the furnace from the shape of the solidified layer at the bottom of the furnace, a step of estimating the amount of coke in the furnace consumed using a burner, and after consuming the coke in the furnace from the amount of coke in the furnace and estimating the pile shape of the in-furnace filling.
（減尺休風中の炉内充填物の堆積形状を推定する工程）
減尺休風中の炉内充填物の堆積形状を推定する工程では、減尺休風中の炉内充填物の堆積形状（初期堆積形状）を推定する。初期堆積形状の推定方法としては、たとえば減尺休風中の高炉の炉頂から距離計を用いて、炉内充填物表面までの距離を数点測定し、その結果から初期堆積形状を推定する方法が考えられる。前記距離計としては、特に限定されないが、非接触式の距離計、例えばレーザー距離計が挙げられる。そして、前記距離計を用いて、炉内充填物表面までの距離を数点測定することで３次元的に堆積形状を推定できる。ただし、初期堆積形状の推定方法はこれに限定されず、本発明の技術は、初期堆積形状の推定方法の如何に依らず実施することができる。
(Step of estimating the piled shape of the furnace filling during the reduction break)
In the step of estimating the deposition shape of the furnace filling during the reduction rest period, the deposition shape (initial deposition shape) of the furnace filling during the reduction rest period is estimated. As a method of estimating the initial deposit shape, for example, using a distance meter from the top of the blast furnace during a downtime, measure the distance from several points to the surface of the filling in the furnace, and estimate the initial deposit shape from the results. I can think of a way. Examples of the rangefinder include, but are not particularly limited to, a non-contact rangefinder such as a laser rangefinder. By measuring the distance to the surface of the in-furnace filling at several points using the rangefinder, the deposition shape can be estimated three-dimensionally. However, the method of estimating the initial deposition shape is not limited to this, and the technique of the present invention can be implemented regardless of the method of estimating the initial deposition shape.
（炉内コークスの充填領域を推定する工程）
炉内コークスの充填領域を推定する工程では、上記初期堆積形状を推定する工程で推定された炉内充填物の堆積形状（初期堆積形状）と、炉内底部の凝固層の形状から、炉内コークスの充填領域を推定する。減尺休風中の高炉には、炉内底部において成長した凝固層が存在する。本工程では、この炉内底部に存在する凝固層の形状を推定する。炉内底部の凝固層の形状の推定方法としては、境界要素法による手法が考えられ、たとえば非特許文献１に記載の手法が考えられる。非特許文献１に記載の手法は、凝固層界面を銑鉄の凝固温度（１１５０℃）の等温線と仮定し、境界要素法による伝熱計算を行い、実炉において熱電対により測定された炉底の温度の実測値と境界要素法による温度の計算結果の誤差が最小となるような凝固界面を逐次計算して算出する方法である。このように算出した凝固界面から炉内底部の凝固層の形状を推定できる。なお、高炉の羽口より下の炉底部には、高炉周方向および高さ方向の複数位置に熱電対が設置されていることが一般的である。
(Step of estimating the filling area of coke in the furnace)
In the process of estimating the filling area of coke in the furnace, from the deposition shape (initial deposition shape) of the in-furnace filling estimated in the process of estimating the initial deposition shape and the shape of the solidified layer at the bottom of the furnace, Estimate the coke filling area. In a blast furnace that is being cut and blown, there is a solidified layer that has grown at the bottom of the furnace. In this step, the shape of the solidified layer existing at the bottom of the furnace is estimated. As a method for estimating the shape of the solidified layer at the bottom of the furnace, a method using a boundary element method, such as the method described in
上述のようにして、炉内底部の凝固層の形状を推定した後、炉内コークスの充填領域を推定する。炉内コークスの充填領域の推定方法としては、上述のように推定された初期堆積形状と、炉内底部の凝固層の形状から、前記凝固層の形状以外の領域を、炉内コークスの充填領域と推定することができる。 After estimating the shape of the solidified layer at the bottom of the furnace in the manner described above, the in-furnace coke filling area is estimated. As a method for estimating the coke filling area in the furnace, from the initial deposition shape estimated as described above and the shape of the solidified layer at the bottom of the furnace, the area other than the shape of the solidified layer is defined as the coke filling area in the furnace. can be estimated as
（バーナーを用いて消費される炉内コークス量を推定する工程および前記炉内コークス量から炉内コークス消費後の炉内充填物の堆積形状を推定する工程）
バーナーを用いて消費される炉内コークス量を推定する工程では、高炉の出銑孔から炉内に挿入されたバーナーにより消費される炉内コークス量を推定する。この推定方法としては、たとえば前記バーナーから炉内に吹き込まれる燃焼ガスのコークス充填層（炉内コークスの充填領域）における流路と、燃焼ガスの組成を用いて、バーナーから吹込んだガスが全てコークスと反応すると仮定して推定する方法が考えられる。ただし、燃焼ガスの温度は炉内を上昇しながら徐々に低下するため、コークス充填層中で反応が進行する温度よりも低くなる可能性がある。また、反応が進行する温度であっても、その温度によって反応速度は変化する。そのため、燃焼ガスと炉内コークスとの間の伝熱と、各種反応の反応速度の温度依存性を考慮したうえで、炉内コークス（劣化コークス）の消費挙動を推定することが望ましい。
(Step of estimating the amount of coke in the furnace consumed using a burner and step of estimating the deposition shape of the furnace filling after consuming the coke in the furnace from the amount of coke in the furnace)
In the step of estimating the in-furnace coke amount consumed using the burner, the in-furnace coke amount consumed by the burner inserted into the furnace from the tap hole of the blast furnace is estimated. As this estimation method, for example, using the flow path in the coke packed bed (filled area of coke in the furnace) of the combustion gas blown into the furnace from the burner and the composition of the combustion gas, all the gas blown from the burner A method of estimating by assuming reaction with coke is conceivable. However, since the temperature of the combustion gas gradually decreases as it rises in the furnace, it may be lower than the temperature at which the reaction proceeds in the coke packed bed. Moreover, even at the temperature at which the reaction proceeds, the reaction rate changes depending on the temperature. Therefore, it is desirable to estimate the consumption behavior of the in-furnace coke (degraded coke) after taking into account the heat transfer between the combustion gas and the in-furnace coke and the temperature dependence of the reaction rate of various reactions.
出銑孔から挿入するバーナーに用いるガスとしては、ガスそのもの、あるいはガスの燃焼後に炉内コークスを反応消費するようなものであればよい。本発明者らは、前記ガスとしてＬＮＧ、酸素を用いたが、本発明に記載の技術において使用できるガス種はこれらに限るものではない。 The gas used for the burner inserted from the tap hole may be any gas itself or any gas that reacts and consumes coke in the furnace after combustion of the gas. The inventors have used LNG and oxygen as the gases, but the gas species that can be used in the technology described in the present invention are not limited to these.
上述のようにして、バーナーを用いて消費される炉内コークス量（炉内コークス消費領域）を推定した後、炉内コークス消費後の炉内充填物の堆積形状を推定する工程において、前記推定した炉内コークス量をもとに、炉内コークス消費後の炉内充填物の堆積形状を推定する。炉内コークス消費後の堆積形状は、図３に示すように、炉内コークス（劣化コークス）が燃焼ガスによって消費されることで生じた空洞領域をもとに、前記空洞領域以外の領域を、炉内コークス消費後の炉内充填物の堆積形状と推定することができる。 After estimating the amount of in-furnace coke consumed using the burner (in-furnace coke consumption region) as described above, in the step of estimating the deposition shape of the in-furnace filling after consuming the in-furnace coke, the estimation Based on the calculated in-furnace coke amount, the deposition shape of the in-furnace filling after the in-furnace coke consumption is estimated. As shown in FIG. 3, the deposition shape after the consumption of coke in the furnace is based on the cavity region generated by the consumption of the coke in the furnace (degraded coke) by the combustion gas. It can be presumed to be the deposition shape of the furnace filling after the consumption of coke in the furnace.
＜高炉炉内コークスの置換方法＞
本発明の高炉炉内コークスの置換方法は、上述の高炉炉内充填物の堆積形状の推定方法を用いるものであり、具体的には、減尺休風中の炉内充填物の堆積形状（初期堆積形状）と、前記炉内コークス消費後の炉内充填物の堆積形状をもとに、これらの堆積形状の変化を抑制するように、高炉炉内に新たなコークスを充填し、減尺休風中の炉内コークスを新たなコークスと置換するものである。すなわち、新たに充填するコークスの量や位置は、炉内充填物の初期堆積形状を再現するように充填されることが望ましい。コークスを新たに充填する方法としては、たとえば通常操業時と同様に炉頂から充填する方法や、羽口部からベルトコンベアを炉内に挿入し、このベルトコンベアにより充填する方法が考えられるが、新たなコークスを充填する位置と炉内充填物との高度差が大きいほど、充填される新しいコークスの細粒化が進む可能性が高まるため、できるだけ炉内充填物との高度差が小さい位置から新たなコークスを炉内に充填することが望ましい。
<Method for replacing coke in blast furnace>
The blast furnace coke replacement method of the present invention uses the above-described method for estimating the deposition shape of the blast furnace filling, and specifically, the deposition shape of the furnace filling during the reduction break ( Based on the initial deposit shape) and the deposit shape of the furnace filling after consuming the coke in the furnace, new coke is filled in the blast furnace furnace so as to suppress changes in these deposit shapes, and the scale is reduced. It replaces the coke in the furnace during resting with new coke. That is, it is desirable that the amount and position of newly charged coke be such that the initial deposition shape of the in-furnace filling material is reproduced. As a method of newly charging coke, for example, a method of charging from the top of the furnace as in normal operation, or a method of inserting a belt conveyor into the furnace from the tuyere and charging by this belt conveyor can be considered. The greater the height difference between the position where new coke is charged and the furnace charge, the higher the possibility that the new coke being charged will be finely grained. It is desirable to fill the furnace with fresh coke.
以上に説明したように、本発明に記載の手法を用いれば、減尺休風中の炉内に存在する炉内コークス（劣化コークス）消費に伴う堆積形状の変化を推測し、その推測結果を参照して高炉内にコークスを充填することで、高炉内コークス置換に伴う堆積形状の変化を緩和しながら、劣化コークスを新しいコークスに置換して炉下部の通気、通液性を向上させることができるようになり、休風状態の高炉をより安定的に定常操業状態まで立ち上げることができる。 As described above, if the method described in the present invention is used, the change in the deposition shape due to the consumption of coke in the furnace (deteriorated coke) present in the furnace during the reduced wind reduction is estimated, and the estimation result is obtained. By filling the blast furnace with coke, it is possible to improve the ventilation and liquid permeability of the lower part of the furnace by replacing the deteriorated coke with new coke while mitigating the change in the deposit shape due to the replacement of coke in the blast furnace. As a result, the blast furnace in a dormant state can be started up more stably to a steady operating state.
以下、実施例を示して本発明について具体的に説明する。 EXAMPLES Hereinafter, the present invention will be specifically described with reference to Examples.
長期間減尺休風状態にある商用高炉について、上述の実施形態に基づいて劣化コークス消費後の炉内充填物の堆積形状を推定し、その後新しいコークスを充填してから、羽口からの送風を開始し、当該高炉の立上げ操業を行った。 For a commercial blast furnace in a long-term wind reduction state, the accumulated shape of the furnace filling after consumption of deteriorated coke is estimated based on the above-mentioned embodiment, then new coke is filled, and then air is blown from the tuyere. and started up the blast furnace.
まず、減尺休風中の当該高炉炉頂部から非接触式の距離計（本実施例ではレーザー距離計）を使用して測定された炉内充填物までの距離データから、炉内充填物の初期堆積形状を推定した。さらに、当該高炉炉底部に設置された温度計のデータを用いて、前記実施形態に記載の手法により当該高炉炉内底部の凝固層形状を境界要素法により推定した。これらの手法から、炉内コークスの充填領域を推定した結果を図２に示す。なお、図２（ａ）は、推定した炉内コークスの充填領域を斜め上方から示した図であり、図２（ｂ）は、図２（ａ）の出銑孔（２ｔｈ）の垂直断面図（模式図）を示している。 First, from the distance data from the top of the blast furnace to the furnace filling measured using a non-contact rangefinder (a laser rangefinder in this example) during the reduction break, the furnace filling The initial deposit shape was estimated. Furthermore, using data from a thermometer installed at the bottom of the blast furnace, the shape of the solidified layer at the bottom of the blast furnace was estimated by the boundary element method according to the method described in the above embodiment. Fig. 2 shows the results of estimating the in-furnace coke filling area from these methods. FIG. 2(a) is a diagram showing the estimated coke filling area in the furnace from obliquely above, and FIG. 2(b) is a vertical sectional view of the tap hole (2th) in FIG. 2(a). (schematic diagram).
続いて、当該高炉炉底部の出銑孔からバーナーを挿入して燃焼ガスを炉内に吹き込むことを想定し、前記燃焼ガスの吹込みによる炉内コークス（劣化コークス）消費に伴う、炉内充填物の堆積形状の変化を、前記実施形態に記載の手法により推定した。劣化コークス消費後の炉内充填物の堆積形状の推定結果を図３に示す。なお、図３（ａ）は、推定した劣化コークス消費後の炉内充填物の堆積形状を斜め上方から示した図であり、図３（ｂ）は、図３（ａ）の出銑孔（２ｔｈ）の垂直断面図（模式図）を示している。図２、図３を比較すると、出銑孔の近傍から上方に向かって、劣化コークスが消費されて、すり鉢状の空洞が形成されたことが分かった。また、図２、図３の推定結果の比較により、空洞の体積から、空洞を充填するために必要な新しいコークスの重量を計算した。 Subsequently, assuming that a burner is inserted from the tapping hole at the bottom of the blast furnace and the combustion gas is blown into the furnace, the furnace filling accompanying the consumption of coke (degraded coke) in the furnace due to the blowing of the combustion gas A change in the deposited shape of the object was estimated by the method described in the above embodiment. FIG. 3 shows the estimation result of the deposition shape of the furnace filling after the consumption of deteriorated coke. FIG. 3(a) is a diagram showing the accumulated shape of the estimated furnace filling after consumption of deteriorated coke from obliquely above, and FIG. 3(b) is a tap hole ( 2th) is a vertical sectional view (schematic diagram). Comparing Figs. 2 and 3, it was found that the deteriorated coke was consumed upward from the vicinity of the tap hole, and a mortar-shaped cavity was formed. Also, by comparing the estimation results of FIGS. 2 and 3, the weight of new coke required to fill the cavity was calculated from the volume of the cavity.
前記重量の推定結果を基に、出銑孔からバーナーを挿入して炉内の劣化コークスを消費し、前記空洞に羽口から新しいコークスを充填した後、羽口レベルより上の部分に炉頂からコークス、主原料を装入した。その後羽口より送風を開始し立上げ操業を行ったところ、出銑孔からの溶銑滓排出は順調に行われ、溶銑滓が排出できずに羽口レベルまで炉内の残銑滓が滞留するといった重大なトラブルを引き起こすことなく、定常操業状態に復帰することができた。 Based on the weight estimation result, a burner is inserted from the taphole to consume the deteriorated coke in the furnace, and after filling the cavity with new coke from the tuyere, the furnace top is placed above the tuyere level. Coke, the main raw material, was charged from the After that, the slag was discharged smoothly from the taphole, and the slag remained in the furnace up to the tuyere level. It was possible to return to a steady state of operation without causing such serious trouble.
以上の結果から、本発明により、高炉内コークス置換に伴う堆積形状の変化を緩和しながら、劣化コークスを新しいコークスに置換して炉下部の通気、通液性を向上させ、減尺休風状態の高炉を安定的に定常操業状態まで立ち上げることができることが分かった。 From the above results, according to the present invention, the deterioration coke is replaced with new coke to improve the ventilation and liquid permeability in the lower part of the furnace while mitigating the change in the deposit shape accompanying the replacement of coke in the blast furnace. It was found that the blast furnace can be stably started up to a steady operating state.
１ 高炉炉体
２ 羽口（送風羽口）
３ 出銑孔
４ コークス
５ 凝固層
６ バーナー
1
3
Claims (2)
減尺休風中の炉内充填物の堆積形状を推定する工程と、
炉内底部の凝固層の形状を推定し、前記工程で推定された炉内充填物の堆積形状と、炉内底部の凝固層の形状から、炉内コークスの充填領域を推定する工程と、
前記バーナーを用いて消費される炉内コークス量を推定する工程と、
前記炉内コークス量から炉内コークス消費後の炉内充填物の堆積形状を推定する工程と、
を有する、高炉炉内充填物の堆積形状の推定方法。 Furnace filling after consuming coke in the furnace by inserting a burner into the furnace from the tapping hole of the blast furnace when the blast furnace is started up during the downtime and wind reduction. A method for estimating the deposition shape of a blast furnace filling material for estimating the deposition shape of
A step of estimating the deposition shape of the furnace filling during the reduction break;
A step of estimating the shape of the solidified layer at the bottom of the furnace, and estimating the filling area of the coke in the furnace from the deposition shape of the furnace filling estimated in the above step and the shape of the solidified layer at the bottom of the furnace;
estimating the amount of in-furnace coke consumed using the burner;
A step of estimating the deposition shape of the furnace filling after consuming the furnace coke from the furnace coke amount;
A method for estimating a pile shape of a blast furnace filling material.
前記減尺休風中の炉内充填物の堆積形状と、前記炉内コークス消費後の炉内充填物の堆積形状の変化を抑制するように高炉炉内にコークスを充填する、高炉炉内コークスの置換方法。 A method for replacing coke in a blast furnace using the method for estimating the pile shape of the blast furnace filling according to claim 1,
Coke in the blast furnace furnace, which fills the blast furnace furnace with coke so as to suppress changes in the deposition shape of the furnace filling during the reduction rest and the deposition shape of the furnace filling after the consumption of the in-furnace coke. replacement method.
Priority Applications (5)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2021132661A JP7196967B1 (en) | 2021-08-17 | 2021-08-17 | Method for estimating deposit shape of filler in blast furnace and method for replacing coke in blast furnace |
| KR1020247002655A KR20240024991A (en) | 2021-08-17 | 2022-07-06 | Method for estimating the deposited shape of the charge in the blast furnace and method for replacing coke in the blast furnace |
| PCT/JP2022/026800 WO2023021870A1 (en) | 2021-08-17 | 2022-07-06 | Method for estimating depositional shape of blast furnace filling and method for substituting blast furnace coke |
| EP22858193.0A EP4357465A1 (en) | 2021-08-17 | 2022-07-06 | Method for estimating depositional shape of blast furnace filling and method for substituting blast furnace coke |
| CN202280051590.3A CN117693597A (en) | 2021-08-17 | 2022-07-06 | Method for estimating shape of stack of charge in blast furnace and method for replacing coke in blast furnace |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2021132661A JP7196967B1 (en) | 2021-08-17 | 2021-08-17 | Method for estimating deposit shape of filler in blast furnace and method for replacing coke in blast furnace |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP7196967B1 true JP7196967B1 (en) | 2022-12-27 |
| JP2023027519A JP2023027519A (en) | 2023-03-02 |
Family
ID=84687853
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2021132661A Active JP7196967B1 (en) | 2021-08-17 | 2021-08-17 | Method for estimating deposit shape of filler in blast furnace and method for replacing coke in blast furnace |
Country Status (5)
| Country | Link |
|---|---|
| EP (1) | EP4357465A1 (en) |
| JP (1) | JP7196967B1 (en) |
| KR (1) | KR20240024991A (en) |
| CN (1) | CN117693597A (en) |
| WO (1) | WO2023021870A1 (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2014047397A (en) | 2012-08-31 | 2014-03-17 | Nippon Steel & Sumitomo Metal | Method for operating blast furnace |
| JP2016030833A (en) | 2014-07-25 | 2016-03-07 | Ｊｆｅスチール株式会社 | Method for starting ventilation in blast furnace, and burner for hearth part temperature rising |
| JP2018003044A (en) | 2016-06-27 | 2018-01-11 | Ｊｆｅスチール株式会社 | Operation abnormality estimation method and operation abnormality estimation device |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0826368B2 (en) * | 1987-09-03 | 1996-03-13 | 株式会社神戸製鋼所 | A method for estimating the deviation of the filling state of the solid reducing agent layer in the core |
| JPH05295415A (en) * | 1992-04-23 | 1993-11-09 | Nippon Steel Corp | Method for operating blast furnace |
-
2021
- 2021-08-17 JP JP2021132661A patent/JP7196967B1/en active Active
-
2022
- 2022-07-06 WO PCT/JP2022/026800 patent/WO2023021870A1/en active Application Filing
- 2022-07-06 KR KR1020247002655A patent/KR20240024991A/en unknown
- 2022-07-06 CN CN202280051590.3A patent/CN117693597A/en active Pending
- 2022-07-06 EP EP22858193.0A patent/EP4357465A1/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2014047397A (en) | 2012-08-31 | 2014-03-17 | Nippon Steel & Sumitomo Metal | Method for operating blast furnace |
| JP2016030833A (en) | 2014-07-25 | 2016-03-07 | Ｊｆｅスチール株式会社 | Method for starting ventilation in blast furnace, and burner for hearth part temperature rising |
| JP2018003044A (en) | 2016-06-27 | 2018-01-11 | Ｊｆｅスチール株式会社 | Operation abnormality estimation method and operation abnormality estimation device |
Also Published As
| Publication number | Publication date |
|---|---|
| CN117693597A (en) | 2024-03-12 |
| JP2023027519A (en) | 2023-03-02 |
| WO2023021870A1 (en) | 2023-02-23 |
| EP4357465A1 (en) | 2024-04-24 |
| KR20240024991A (en) | 2024-02-26 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| EP2333120A1 (en) | Process for producing molten iron | |
| US20230175085A1 (en) | Blast furnace operation method | |
| JP7196967B1 (en) | Method for estimating deposit shape of filler in blast furnace and method for replacing coke in blast furnace | |
| JP4326581B2 (en) | How to operate a vertical furnace | |
| JP5862519B2 (en) | Blast furnace operation method | |
| JP7306421B2 (en) | How to start up a blast furnace | |
| US8475561B2 (en) | Method for producing molten iron | |
| JP4739920B2 (en) | Blast furnace operation method with small furnace heat fluctuation | |
| RU2812287C1 (en) | Way blast furnace works | |
| WO2024122239A1 (en) | Blast-furnace operating method | |
| TWI776499B (en) | blast furnace operation method | |
| JP4161526B2 (en) | Operation method of smelting reduction furnace | |
| JP7243677B2 (en) | Furnace bottom temperature raising method and blast furnace start-up method | |
| TWI797000B (en) | Heat supply estimation method, heat supply estimation device, heat supply estimation program, and blast furnace operation method | |
| WO2023233957A1 (en) | Blast-furnace operation method and blast furnace | |
| JPH08199213A (en) | Production of molten iron | |
| JP2001073016A (en) | Operation of blast furnace | |
| JP3879539B2 (en) | Blast furnace operation method | |
| JP2008255402A (en) | Blast furnace operation method | |
| JP2023152640A (en) | Blast furnace operation method | |
| JP2921392B2 (en) | Blast furnace operation method | |
| JPH0776713A (en) | Operation of shifting layer type scrap melting furnace | |
| CN115485396A (en) | Method for detecting fluctuation of solidified layer and method for operating blast furnace | |
| YA et al. | On the prospects for increasing the flow rate of pulverized coal in iron production within the operating conditions of Blast Furnace Shop of PJSC" Ilyich Iron and Steel Works". | |
| Zinchenko et al. | On the prospects for increasing the flow rate of pulverized coal in iron production within the operating conditions of Blast Furnace Shop of PJSC “Ilyich Iron and Steel Works” |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A621 | Written request for application examination |
Free format text: JAPANESE INTERMEDIATE CODE: A621 Effective date: 20220905 |
|
| A871 | Explanation of circumstances concerning accelerated examination |
Free format text: JAPANESE INTERMEDIATE CODE: A871 Effective date: 20220905 |
|
| A131 | Notification of reasons for refusal |
Free format text: JAPANESE INTERMEDIATE CODE: A131 Effective date: 20220913 |
|
| A521 | Request for written amendment filed |
Free format text: JAPANESE INTERMEDIATE CODE: A523 Effective date: 20221003 |
|
| TRDD | Decision of grant or rejection written | ||
| A01 | Written decision to grant a patent or to grant a registration (utility model) |
Free format text: JAPANESE INTERMEDIATE CODE: A01 Effective date: 20221115 |
|
| A61 | First payment of annual fees (during grant procedure) |
Free format text: JAPANESE INTERMEDIATE CODE: A61 Effective date: 20221128 |
|
| R150 | Certificate of patent or registration of utility model |
Ref document number: 7196967 Country of ref document: JP Free format text: JAPANESE INTERMEDIATE CODE: R150 |