WO2023021870A1 - 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 - Google Patents
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 Download PDFInfo
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- WO2023021870A1 WO2023021870A1 PCT/JP2022/026800 JP2022026800W WO2023021870A1 WO 2023021870 A1 WO2023021870 A1 WO 2023021870A1 JP 2022026800 W JP2022026800 W JP 2022026800W WO 2023021870 A1 WO2023021870 A1 WO 2023021870A1
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- furnace
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- 239000000571 coke Substances 0.000 title claims abstract description 131
- 238000000034 method Methods 0.000 title claims abstract description 58
- 230000008021 deposition Effects 0.000 claims description 36
- 230000009467 reduction Effects 0.000 claims description 19
- 239000000463 material Substances 0.000 claims description 13
- 238000010079 rubber tapping Methods 0.000 claims description 4
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 33
- 229910052742 iron Inorganic materials 0.000 description 16
- 239000002893 slag Substances 0.000 description 13
- 239000002994 raw material Substances 0.000 description 11
- 238000007664 blowing Methods 0.000 description 10
- 238000001816 cooling Methods 0.000 description 10
- 239000000567 combustion gas Substances 0.000 description 9
- 230000008859 change Effects 0.000 description 8
- 239000007789 gas Substances 0.000 description 8
- 239000003638 chemical reducing agent 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 6
- 239000002184 metal Substances 0.000 description 5
- 229910052751 metal Inorganic materials 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
- 238000009423 ventilation Methods 0.000 description 4
- 229910000805 Pig iron Inorganic materials 0.000 description 3
- 239000000945 filler Substances 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- 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
- 230000005059 dormancy Effects 0.000 description 2
- 230000003628 erosive effect Effects 0.000 description 2
- 230000007774 longterm Effects 0.000 description 2
- 239000000155 melt Substances 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 230000000116 mitigating effect Effects 0.000 description 2
- 238000007711 solidification Methods 0.000 description 2
- 230000008023 solidification Effects 0.000 description 2
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 125000004432 carbon atom Chemical group C* 0.000 description 1
- 230000006866 deterioration 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
- 238000002309 gasification Methods 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
- 229910052739 hydrogen Inorganic materials 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
- 230000008018 melting Effects 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000012768 molten material Substances 0.000 description 1
- 239000003345 natural gas Substances 0.000 description 1
- 239000008188 pellet Substances 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 239000011819 refractory material Substances 0.000 description 1
- 230000008439 repair process Effects 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
- 239000002341 toxic gas Substances 0.000 description 1
Images
Classifications
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- 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
Definitions
- the present invention relates to a method for estimating the shape of deposits of filling material in a blast furnace and a method for replacing coke in a blast furnace.
- 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.
- 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.
- the melt inside the furnace becomes more viscous and even solidifies, making it difficult to discharge from the taphole. If air is blown from the tuyere in such a situation, the hot metal slag that has been reduced and melted is not discharged, so the amount of molten iron slag that remains in the lower part of the furnace increases. As the temperature of the lower part of the furnace rises due to dripping molten iron slag, the molten iron slag remaining in the lower part of the furnace may be discharged.
- a furnace cooling accident means that the heat level in the blast furnace has dropped significantly, making it impossible to discharge molten iron slag from the tap hole, making it difficult to continue steady operation.
- the following measures will be taken to restore the reactor condition. That is, the solidified material between one tap hole and the tuyere immediately above it is melted by oxygen blowing or the like and discharged to secure the outlet of the melted material. After that, air is blown through the tap hole and two or three tuyeres directly above the tap hole, and the generated molten material gradually melts the surrounding solidified layer, and the number of tap holes and tuyeres to be used is adjusted in steady operation.
- 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.
- 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.
- a burner is inserted into the taphole to blow oxygen and fuel into the tap hole before blowing air to reduce the risk of furnace cooling when the wind is not blowing or when the wind is being reduced.
- a method has been proposed in which air blowing is started after the heat level up to the iron hole is sufficiently raised (Patent Document 1).
- a method has been proposed in which part of the pulverized and weakened coke (deteriorated coke) in the lower part of the furnace is removed by burning and replaced with new coke. (Patent document 2).
- JP 2016-30833 A JP-A-5-295415
- Patent Document 1 The method described in Patent Document 1 is effective for improving the heat level in the lower part of the blast furnace.
- the lower part of the furnace can be further improved. It is considered that the ventilation and liquid permeability of the furnace can be secured, and the risk of furnace cooling accidents can be reduced.
- the coke existing around the deteriorated coke is only unloaded. It cannot be said that it will be replaced by coke.
- 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.
- Another object of the present invention is to provide a method for replacing coke in a blast furnace using the estimation method.
- 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.
- 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. .
- the change in the piled shape of the furnace filling due to the consumption of deteriorated coke is estimated, and the estimation result is referred to fill the blast furnace with coke.
- the coke in the furnace (deteriorated coke) during the reduction break is replaced with new coke to ventilate the lower part of the furnace. Liquid permeability can be improved.
- the blast furnace in the dormant state can be stably started up to the steady operation state.
- FIG. 1 is a schematic diagram showing an example of a piled shape of a filling material in a blast furnace during a reduction break and a state in which a burner is inserted into the furnace from a tap hole of the blast furnace.
- FIG. 2 is a diagram showing the in-furnace coke charging region estimated in this example.
- FIG. 3 is a diagram showing the deposition shape of the in-furnace filling after in-furnace coke consumption estimated in this example.
- 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, and hot air containing oxygen and reducing agents such as pulverized coal are sent into the furnace from the tuyeres.
- the CO and H2 generated by the gasification of the reducing agent near the tuyeres flow to the upper part of the furnace, where the main raw material charged from the top of the furnace is heated, reduced, and melted to produce hot metal. .
- the produced molten iron drips inside the furnace, accumulates in the hearth, and is discharged out of the furnace from the tapping hole installed on the lower side of the blast furnace.
- the equipment design of the blast furnace such as the inner volume of the blast furnace, the raw material charging mechanism, the number of tuyeres, etc., often differs for each furnace body, but the present invention can be applied regardless of the difference in the equipment design.
- Main raw materials include iron ore, sintered ore, pellets, scrap, and reduced iron.
- Lump coke, coke smaller than lump coke, and ferro coke are examples of the reducing material charged from the top of the furnace.
- the reducing material injected from the tuyere include pulverized coal, coke powder, plastics, combustible gas containing at least one of carbon atoms and hydrogen atoms such as natural gas, and liquid fossil fuels.
- the present invention can be applied regardless of the types of raw materials and reducing agents used.
- 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).
- 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.
- Step of estimating the piled shape of the furnace filling during the reduction break the deposition shape (initial deposition shape) of the furnace filling during the reduction rest period is estimated.
- the deposition shape initial deposition shape
- the rangefinder include, but are not particularly limited to, a non-contact rangefinder such as a laser rangefinder.
- the deposition shape 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.
- 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.
- 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.
- a blast furnace that is being cut and blown there is a solidified layer that has grown at the bottom of the furnace.
- the shape of the solidified layer existing at the bottom of the furnace is estimated.
- a method for estimating the shape of the solidified layer at the bottom of the furnace there is a method using a boundary element method, such as the method described in Non-Patent Document 1.
- Non-Patent Document 1 assumes that the solidified layer interface is an isotherm of the solidification temperature (1150° C.) of pig iron, and performs heat transfer calculation by the boundary element method. Then, it is a method of successively calculating a solidification interface that minimizes the error between the measured value of the temperature of the bottom of the furnace measured by a thermocouple in an actual furnace and the temperature calculated by the boundary element method. The shape of the solidified layer at the bottom of the furnace can be estimated from the solidified interface thus calculated.
- thermocouples are generally installed at a plurality of positions in the circumferential direction and the height direction of the blast furnace at the bottom of the blast furnace below the tuyeres.
- the coke filling area in the furnace is estimated.
- the area other than the shape of the solidified layer is defined as the coke filling area in the furnace.
- 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.
- this estimation method for example, using the flow path in the coke packed bed (the coke filling area in the furnace) of the combustion gas blown into the furnace from the burner and the composition of the combustion gas, all the combustion gas blown from the burner A method of estimating by assuming reaction with coke can be mentioned.
- 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. Further, even if the temperature of the combustion gas is 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.
- the gas used for the burner inserted from the tap hole may be gas itself, or gas that reacts and consumes coke in the furnace after burning the gas.
- the present inventors 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.
- 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.
- 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.
- a method for replacing coke in a blast furnace according to the present invention uses the above-described method for estimating the shape of deposits of filler in a blast furnace. Specifically, based on the deposition shape (initial deposition shape) of the furnace filling during the reduction break and the deposition shape of the furnace filling after consuming the coke in the furnace, changes in these deposition shapes In order to suppress the blast furnace, new coke is filled in the blast furnace and the coke in the furnace during the reduction break is replaced 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.
- a method of newly charging coke for example, a method of charging from the top of the furnace as in normal operation, and a method of inserting a belt conveyor into the furnace from the tuyere and charging with this belt conveyor can be mentioned.
- the change in deposit shape accompanying the consumption of in-furnace coke (deteriorated coke) present in the furnace during a reduced wind reduction can be estimated, and the estimation results can be referred to. to fill the blast furnace with coke.
- the blast furnace in the dormant state can be more stably started up to the steady operation state.
- the deposition shape of the furnace filling after consuming deteriorated coke is estimated based on the above-described embodiment, and then new coke is filled. , started blowing air from the tuyeres and started up the blast furnace.
- 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
- FIG. 2(b) is a vertical sectional view of the tap hole (2th) in FIG. 2(a). (schematic diagram).
- 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
- FIG. 3(b) is a tap hole ( 2th) is a vertical sectional view (schematic diagram). Comparing Figs.
- 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, when we started blowing air from the tuyere and started up operation, the molten iron slag was discharged smoothly from the tap hole, and the molten iron slag could not be discharged and the furnace reached the tuyere level (height of the tuyere). It was possible to return to a steady state of operation without causing a serious trouble such as residual iron slag inside.
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Abstract
Description
[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。
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。
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挙げられる。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。
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挙げられ、たとえば非特許文献1に記載の手法が挙げられる。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う。そして、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。
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、バーナーから吹き込んだ燃焼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挙げられる。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、燃焼ガスの温度は、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。
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る。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挙げられる。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。そのため、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。
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
Claims (2)
- 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。 - 請求項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。
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Citations (5)
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JPS6465211A (en) * | 1987-09-03 | 1989-03-10 | Kobe Steel Ltd | Method for estimating deviation in packing state of furnace core solid reducing agent |
JPH05295415A (ja) | 1992-04-23 | 1993-11-09 | Nippon Steel Corp | 高炉操業方法 |
JP2014047397A (ja) * | 2012-08-31 | 2014-03-17 | Nippon Steel & Sumitomo Metal | 高炉の操業方法 |
JP2016030833A (ja) | 2014-07-25 | 2016-03-07 | Jfeスチール株式会社 | 高炉の送風開始方法および炉床部昇温用バーナー |
JP2018003044A (ja) * | 2016-06-27 | 2018-01-11 | Jfeスチール株式会社 | 操業異常推定方法および操業異常推定装置 |
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JPS6465211A (en) * | 1987-09-03 | 1989-03-10 | Kobe Steel Ltd | Method for estimating deviation in packing state of furnace core solid reducing agent |
JPH05295415A (ja) | 1992-04-23 | 1993-11-09 | Nippon Steel Corp | 高炉操業方法 |
JP2014047397A (ja) * | 2012-08-31 | 2014-03-17 | Nippon Steel & Sumitomo Metal | 高炉の操業方法 |
JP2016030833A (ja) | 2014-07-25 | 2016-03-07 | Jfeスチール株式会社 | 高炉の送風開始方法および炉床部昇温用バーナー |
JP2018003044A (ja) * | 2016-06-27 | 2018-01-11 | Jfeスチール株式会社 | 操業異常推定方法および操業異常推定装置 |
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Title |
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YOSHIKAWA FUMIAKI: "Estimation of Refractory Wear and Solidified Layer Distribution in the Blast Furnace Hearth and Its Application to the Operation", TETSU-TO-HAGANE, vol. 73, no. 15, 1987, pages 2068 - 2075 |
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