JPH0464787B2 - - Google Patents
Info
- Publication number
- JPH0464787B2 JPH0464787B2 JP59078624A JP7862484A JPH0464787B2 JP H0464787 B2 JPH0464787 B2 JP H0464787B2 JP 59078624 A JP59078624 A JP 59078624A JP 7862484 A JP7862484 A JP 7862484A JP H0464787 B2 JPH0464787 B2 JP H0464787B2
- Authority
- JP
- Japan
- Prior art keywords
- molten metal
- flow rate
- tundish
- present
- nozzle
- 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
Links
Classifications
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
- G05D7/00—Control of flow
- G05D7/06—Control of flow characterised by the use of electric means
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Automation & Control Theory (AREA)
- Continuous Casting (AREA)
- Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)
- Flow Control (AREA)
Description
【発明の詳細な説明】
〔本発明の技術分野〕
本発明は、溶融金属の流量制御方法に関し、特
に、連続製鋼プラントに於いて、安定した品質す
なわち安定した炭素濃度の製品を製造すべく、キ
ユポラから精錬炉へ溶融金属を連続的に定量供給
するための溶融金属の流量制御方法に関する。[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to a method for controlling the flow rate of molten metal, and in particular, in a continuous steel manufacturing plant, in order to manufacture products of stable quality, that is, stable carbon concentration. The present invention relates to a method for controlling the flow rate of molten metal for continuously and quantitatively supplying molten metal from a cupola to a refining furnace.
従来の連続性鋼プラントの概要は第３図に示す
ようであり、キユポラ１にて溶解された高炭素溶
湯を精錬炉５へ連続的に導いて精錬炉５内で所定
の炭素濃度まで脱炭して溶鋼を得、これを連続鋳
造する一連のプラントである。すなわち、キユポ
ラ１からの高炭素溶湯を脱硫槽２にて脱硫した
後、前炉３、定量供給タンデイツシユ４を経て精
錬炉５に導入して脱炭する。次いで、この脱炭さ
れた溶湯を脱酸槽６、成分調整炉７及び連続鋳造
タンデイツシユ８を経て連続鋳造機９に供給する
一連のプラントである。
The outline of a conventional continuous steel plant is shown in Fig. 3, in which high-carbon molten metal melted in cupola 1 is continuously guided to smelting furnace 5, where it is decarburized to a predetermined carbon concentration. This is a series of plants that continuously casts molten steel. That is, after the high-carbon molten metal from the cupola 1 is desulfurized in the desulfurization tank 2, it is introduced into the refining furnace 5 via the fore-furnace 3 and the quantitative feed tundish 4 to be decarburized. This is a series of plants in which the decarburized molten metal is then supplied to a continuous casting machine 9 via a deoxidizing tank 6, a component adjustment furnace 7, and a continuous casting tandy 8.
このような一連のプラントにおいて、上記した
ように、キユポラ１から精錬炉５へ連続かつ定量
的に溶湯を供給する手段として、定量供給タンデ
イツシユ４を設置している。このダンデイツシユ
４は、第４図に示すように、所定の内径を有する
耐火材製ノズル１５を有するものである。そし
て、溶湯１１がこのノズル１５中を通過させるこ
とによつて、所定流量の溶湯１１を製錬炉５へ供
給するものである。なお、第４図において、１２
は耐火材であり、１３は鉄皮、１４はロードセ
ル、１６はストリームである。
In such a series of plants, as described above, a quantitative supply tundish 4 is installed as a means for continuously and quantitatively supplying molten metal from the cupola 1 to the refining furnace 5. As shown in FIG. 4, the dungeon 4 has a nozzle 15 made of a refractory material and having a predetermined inner diameter. By passing the molten metal 11 through this nozzle 15, a predetermined flow rate of the molten metal 11 is supplied to the smelting furnace 5. In addition, in Figure 4, 12
is a refractory material, 13 is an iron shell, 14 is a load cell, and 16 is a stream.
ところで、上記従来の定量供給タンデイツシユ
４は、その耐火材製ノズル１５の内径側が溶湯１
１に、内径の変化をきたし、その結果、溶湯１１
の流量が変化し、定量供給が不可能になる。一
方、精錬炉５では所定の炭素濃度になるように酸
素ガスを供給して脱炭を行つているが、溶湯１１
の流量が変化すると精錬炉５から出ていく溶鋼中
の炭素濃度が変動し製品品質上好ましくない。す
なわち定量供給タンデイツシユ４のノズル径が変
化すると溶湯流量が変化し、この為製品の品質上
最も重要であり炭素濃度が時間的に変化し、安定
した品質の製品を得にくいという問題がある。
By the way, in the conventional quantitative supply tundish 4, the inner diameter side of the refractory material nozzle 15 is connected to the molten metal 1.
1, the inner diameter changes, and as a result, the molten metal 11
The flow rate changes, making constant supply impossible. On the other hand, in the refining furnace 5, oxygen gas is supplied to achieve a predetermined carbon concentration to perform decarburization, but the molten metal 11
If the flow rate changes, the carbon concentration in the molten steel coming out of the refining furnace 5 will change, which is unfavorable in terms of product quality. In other words, when the nozzle diameter of the quantitative feed tundish 4 changes, the flow rate of the molten metal changes, which causes the carbon concentration, which is most important in terms of product quality, to change over time, making it difficult to obtain a product of stable quality.
本発明は、上記従来の定量供給タンデイツシユ
の有する欠点を解消する溶融金属の流量制御方法
を提供することを目的とする。すなわち、本発明
の目的は、定量供給タンデイツシユの耐火材製ノ
ズル内径が溶湯によつて侵食されたとしても、溶
湯を連続的に、しかも、定量的に供給することが
できる溶融金属の流量制御方法を提供するにあ
る。
SUMMARY OF THE INVENTION An object of the present invention is to provide a method for controlling the flow rate of molten metal, which eliminates the drawbacks of the conventional quantitative feed tundish described above. That is, an object of the present invention is to provide a method for controlling the flow rate of molten metal that can continuously and quantitatively supply molten metal even if the inner diameter of the refractory material nozzle of a quantitative supply tundish is eroded by the molten metal. is to provide.
そして、本発明は、上記目的を達成する手段と
して、定量供給タンデイツシユのノズルを通過し
て落下する溶湯のストリーム径を光学的手法にて
連続的に測定し、これから溶湯流量が一定になる
ように流量制御を行うことにある。すなわち、本
発明は、連続的定量供給槽の底面に設けたノズル
からの溶融金属の流量制御方法において、上記ノ
ズルを通過する溶融金属のストリーム直径を光学
的に測定し、かつ、槽内の溶融金属の重量を測定
し、両側定値に基づいて上記槽内への溶融金属の
供給量を制御することを特徴とする溶融金属の流
量制御方法である。
As a means to achieve the above object, the present invention continuously measures the diameter of the stream of molten metal falling through the nozzle of a quantitative feeding tundish using an optical method, and then measures the flow rate of the molten metal to be constant. Its purpose is to control the flow rate. That is, the present invention provides a method for controlling the flow rate of molten metal from a nozzle provided at the bottom of a continuous quantitative supply tank, in which the diameter of the stream of molten metal passing through the nozzle is optically measured, and the molten metal in the tank is A method for controlling the flow rate of molten metal, characterized in that the weight of the metal is measured and the amount of molten metal supplied into the tank is controlled based on constant values on both sides.
本発明において、ストリーム径を光学的に測定
する手段としては、テレビカメラを使用し、これ
によつて連続的に撮影する手段を採用するのが好
適である。 In the present invention, as a means for optically measuring the stream diameter, it is preferable to use a television camera to continuously take pictures.
以下本発明を第１図に基づいて詳細に説明す
る。第１図は本発明の実施例を説明するための図
であり、この図において、定量供給タンデイツシ
ユ４から精錬炉の受湯口へ落下する溶湯ストリー
ム１６をテレビカメラ１７にて撮影する。溶湯１
１の温度は一般に1400℃以上であるから溶湯スト
リーム１６は周囲の大気とは輝度の差が大きく撮
影され、この輝度の差を利用して影像解析装置１
８により撮影倍率で補正した溶湯ストリーム１６
の直径を連続的に求める。一方、定量供給タンデ
イツシユ４内の溶湯重量をロードセル１４にて連
続的に計測し、ロードセル出力信号変換器１９に
入れる。上記方法にて測定したストリーム直径と
定量供給タンデイツシユ４内の溶湯重量を用いて
次式により溶湯流量を求める。 The present invention will be explained in detail below with reference to FIG. FIG. 1 is a diagram for explaining an embodiment of the present invention, and in this diagram, a molten metal stream 16 falling from a constant supply tundish 4 to a receiving port of a refining furnace is photographed by a television camera 17. Molten metal 1
Since the temperature of the molten metal stream 16 is generally 1400°C or higher, the molten metal stream 16 is photographed with a large difference in brightness from the surrounding atmosphere, and this difference in brightness is used to capture the image analysis device 1.
Molten metal stream 16 corrected by photographing magnification by 8
Continuously find the diameter of On the other hand, the weight of the molten metal in the quantitative supply tundish 4 is continuously measured by the load cell 14 and input to the load cell output signal converter 19. Using the stream diameter measured by the above method and the weight of the molten metal in the quantitative feed tundish 4, the flow rate of the molten metal is determined by the following formula.
ただしＱ：ノズルを通過する溶湯流量（ｇ／
sec）
π：円周率（＝3.14）
Ｃ：流量係数
ｄ：ノズル直径（cm）
ｇ：重力加速度（cm／sec2）
ρ：溶湯の密度（ｇ／cm3）
Ｗ：定量供給タンデイツシユ内の溶湯重量
（ｇ）
Ａ：定量供給タンデイツシユの水平断面積
（cm2）
H2：ノズルの高さ（cm）（第４図参照）
(1)式においてπ、Ｃ、ρ、ｇ、Ａ、H2は既知
であるから溶湯ストリーム径ｄと定量供給タンデ
イツシユ内の溶湯重量Ｗを測定すれば溶湯流量Ｑ
を求めることができる。溶湯ストリーム径は上記
の方法にて測定するが、一方溶湯重量は第１図の
定量供給タンデイツシユの底部に設置したロード
セル１４にて連続的に測定する。これらのストリ
ーム径と溶湯重量の測定値が連続的にコントロー
ラ２０に入り、(1)式により溶湯流量が所定の値よ
り小さいと、油圧モータ２１を介して油圧シリン
ダー２２を作動させて前炉３を傾動させ、定量供
給タンデイツシユ４への注湯量を多くしてこの溶
湯量を増加させることにより定量供給タンデイツ
シユからの出湯流量を増大させる。逆にストリー
ム径と定量供給タンデイツシユ内の溶湯流量の測
定値から計算した溶湯流量が所定の値より大きい
と、油圧シリンダー２２を作動させて前炉３の傾
転角度を小さくし、定量供給タンデイツシユへの
注湯量を少なくして、この溶湯量を減少させるこ
とにより定量供給タンデイツシユ４からの出湯量
を減少させる。このように定量供給タンデイツシ
ユ４のノズルを通過する溶湯ストリーム直径と定
量供給タンデイツシユ内の溶湯重量を連続的に測
定することにより、定量供給タンデイツシユ４か
らの出湯流量を求めて、設定値からの“ずれ”に
応じて定量供給タンデイツシユ内の溶湯重量を増
減することにより溶湯流量を制御する。なおスト
リーム径の測定に関しては一方向だけでなく多方
向から測定し、これらの平均値を用いれば測定精
度及び制御精度が向上するのはもちろんである。 However, Q: flow rate of molten metal passing through the nozzle (g/
sec) π: Pi (=3.14) C: Flow coefficient d: Nozzle diameter (cm) g: Gravitational acceleration (cm/sec 2 ) ρ: Density of molten metal (g/cm 3 ) W: Volume in fixed quantity supply tundish Weight of molten metal (g) A: Horizontal cross-sectional area of constant supply tundish (cm 2 ) H 2 : Height of nozzle (cm) (see Figure 4) In equation (1), π, C, ρ, g, A, H Since 2 is known, the molten metal flow rate Q can be determined by measuring the molten metal stream diameter d and the molten metal weight W in the constant supply tundish.
can be found. The diameter of the molten metal stream is measured by the method described above, while the weight of the molten metal is continuously measured using the load cell 14 installed at the bottom of the quantitative feed tundish shown in FIG. These measured values of the stream diameter and molten metal weight are continuously input to the controller 20, and if the molten metal flow rate is smaller than a predetermined value according to equation (1), the hydraulic cylinder 22 is actuated via the hydraulic motor 21 to By tilting the molten metal and increasing the amount of molten metal poured into the fixed quantity supply tundish 4, the flow rate of molten metal discharged from the fixed quantity supply tundish is increased. Conversely, if the flow rate of molten metal calculated from the measured value of the stream diameter and the flow rate of molten metal in the metered feed tundish is larger than a predetermined value, the hydraulic cylinder 22 is operated to reduce the tilting angle of the forehearth 3, and the flow is transferred to the metered feed tundish. By reducing the amount of molten metal poured into the tundish 4, the amount of molten metal discharged from the constant supply tundish 4 is reduced. By continuously measuring the diameter of the molten metal stream passing through the nozzle of the constant supply tundish 4 and the weight of the molten metal inside the constant supply tundish 4, the flow rate of the melt discharged from the constant supply tundish 4 can be determined, and the "deviation" from the set value can be determined. ”The flow rate of the molten metal is controlled by increasing or decreasing the weight of the molten metal in the constant supply tundish. Regarding the measurement of the stream diameter, it goes without saying that measurement accuracy and control accuracy can be improved by measuring not only from one direction but from multiple directions and using these average values.
上記方法にて定量供給タンデイツシユからの出
湯流量を制御することにより定量供給タンデイツ
シユのノズル径が変化しても一定流量の溶湯を精
錬炉へ供給することができる。 By controlling the flow rate of melt discharged from the quantitative supply tundish in the above method, a constant flow rate of molten metal can be supplied to the refining furnace even if the nozzle diameter of the quantitative supply tundish changes.
以上本発明を詳細に説明したが、さらに本発明
の具体例をあげて、本発明をより詳細に説明す
る。 Although the present invention has been described above in detail, the present invention will be explained in more detail by giving specific examples of the present invention.
連続的定量供給槽からの溶融金属流量設定値を
20.0t／ｈとした。この設定値に対して本発明を
適用して流量制御を行つた場合の溶融金属流量の
経時変化を第２図に示す。この図から明らかなよ
うに、本発明によれば設定値20.0t／ｈに対して
実際の操業値は、平均値が20.04t／ｈ、標準偏差
が0.12t／ｈであつた。一方、本発明によらない
場合、標準偏差が1.5t／ｈであり、この結果、本
発明によれば精度の良い流量制御が可能であるこ
とが判明した。
Set value of molten metal flow rate from continuous metering tank
It was set at 20.0t/h. FIG. 2 shows the change over time in the molten metal flow rate when the flow rate is controlled by applying the present invention to this set value. As is clear from this figure, according to the present invention, the average value of the actual operating values was 20.04 t/h and the standard deviation was 0.12 t/h compared to the set value of 20.0 t/h. On the other hand, when the present invention was not used, the standard deviation was 1.5 t/h, and as a result, it was found that according to the present invention, highly accurate flow rate control was possible.
本発明は、以上詳記したように流量制御を行う
ものであるから、定量供給槽（タンデイツシユ）
のノズル径が変化しても、一定流量の溶融金属を
連続的に、かつ、定量的に供給できる効果が生ず
るものである。そして、本発明を連続製鋼プラン
トに適用した場合、キユポラでの溶触量と連続鋳
造設備での鋳片の製造量とをコントロールするこ
とができ、かつ、マツチングさせることができる
効果が生ずる。さらに、精錬炉での脱炭量制御
（酸素吹精量の制御）が容易となり、製品（鋳片）
の成分、特に炭素濃度が安定する効果が生ずるも
のである。
Since the present invention performs flow rate control as detailed above,
Even if the diameter of the nozzle changes, a constant flow rate of molten metal can be continuously and quantitatively supplied. When the present invention is applied to a continuous steel manufacturing plant, it is possible to control and match the amount of melt contact in the cupola and the amount of slab produced in the continuous casting equipment. Furthermore, it is easier to control the amount of decarburization in the smelting furnace (controlling the amount of oxygen blown), and the product (slabs)
This has the effect of stabilizing the components, especially the carbon concentration.
第１図は本発明の実施例を説明するための図で
あり、第２図は本発明を適用した場合の溶融金属
流量の経時変化を示す図である。第３図は従来の
連続製鋼プラントの概要図であり、第４図は従来
の定量供給タンデイツシユの部分図である。
１……キユポラ、２……脱硫槽、３……前炉、
４……定量供給タンデイツシユ、５……精錬炉、
６……脱酸槽、７……成分調整炉、８……連続鋳
造タンデイツシユ、９……連続鋳造機、１１……
溶湯、１２……耐火材、１３……鉄皮、１４……
ロードセル、１５……耐火材製ノズル、１６……
ストリーム、１７……テレビカメラ、１８……影
像解析装置、１９……ロードセル出力信号変換
器、２０……コントローラ、２１……油圧モー
タ、２２……油圧シリンダー。
FIG. 1 is a diagram for explaining an embodiment of the present invention, and FIG. 2 is a diagram showing a change in molten metal flow rate over time when the present invention is applied. FIG. 3 is a schematic diagram of a conventional continuous steel manufacturing plant, and FIG. 4 is a partial diagram of a conventional quantitative feed tundish. 1...Cyupora, 2...Desulfurization tank, 3...Forehearth,
4...Quantitative supply tandate, 5...Refining furnace,
6... Deoxidizing tank, 7... Composition adjustment furnace, 8... Continuous casting tandate, 9... Continuous casting machine, 11...
Molten metal, 12... Fireproof material, 13... Iron skin, 14...
Load cell, 15... Refractory material nozzle, 16...
Stream, 17... Television camera, 18... Image analysis device, 19... Load cell output signal converter, 20... Controller, 21... Hydraulic motor, 22... Hydraulic cylinder.
Claims (1)
の溶融金属の流量制御方法において、上記ノズル
を通過する溶融金属のストリーム直径を光学的に
測定し、かつ、槽内の溶融金属の重量を測定し、
両測定値に基づいて上記槽内への溶融金属の供給
量を制御することを特徴とする溶融金属の流量制
御方法。1. In a method for controlling the flow rate of molten metal from a nozzle provided at the bottom of a continuous quantitative supply tank, the diameter of the stream of molten metal passing through the nozzle is optically measured, and the weight of the molten metal in the tank is measured. death,
A method for controlling the flow rate of molten metal, characterized in that the amount of molten metal supplied into the tank is controlled based on both measured values.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7862484A JPS60222908A (en) | 1984-04-20 | 1984-04-20 | Control method of flow rate of molten metal |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7862484A JPS60222908A (en) | 1984-04-20 | 1984-04-20 | Control method of flow rate of molten metal |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS60222908A JPS60222908A (en) | 1985-11-07 |
| JPH0464787B2 true JPH0464787B2 (en) | 1992-10-16 |
Family
ID=13667034
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP7862484A Granted JPS60222908A (en) | 1984-04-20 | 1984-04-20 | Control method of flow rate of molten metal |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS60222908A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US12618742B2 (en) | 2023-09-18 | 2026-05-05 | Alarm.Com Incorporated | Periodic water leak detection |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100462726B1 (en) * | 2002-05-27 | 2004-12-20 | 현대자동차주식회사 | A method for measuring charging-movements of semi-solid materials |
| ITMI20050626A1 (en) | 2005-04-13 | 2006-10-14 | Technit Compagnia Tecnica Inte | APPARATUS FOR MEASURING AND MONITORING THE FEEDING OF CHARGING OR SCRAPPING MATERIAL AT A OVEN AND ITS PROCEDURE |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS4992491A (en) * | 1972-12-29 | 1974-09-03 | ||
| JPS56126065A (en) * | 1980-03-10 | 1981-10-02 | Nippon Steel Corp | Sn automatic casting control method |
| JPS5927762A (en) * | 1982-08-09 | 1984-02-14 | Nippon Steel Corp | Method for controlling level of molten steel in casting mold for continuous casting |
-
1984
- 1984-04-20 JP JP7862484A patent/JPS60222908A/en active Granted
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US12618742B2 (en) | 2023-09-18 | 2026-05-05 | Alarm.Com Incorporated | Periodic water leak detection |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS60222908A (en) | 1985-11-07 |
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