JPH0328257B2 - - Google Patents
Info
- Publication number
- JPH0328257B2 JPH0328257B2 JP60104816A JP10481685A JPH0328257B2 JP H0328257 B2 JPH0328257 B2 JP H0328257B2 JP 60104816 A JP60104816 A JP 60104816A JP 10481685 A JP10481685 A JP 10481685A JP H0328257 B2 JPH0328257 B2 JP H0328257B2
- Authority
- JP
- Japan
- Prior art keywords
- molten steel
- nozzle
- pressure
- slag
- container
- 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
- 229910000831 Steel Inorganic materials 0.000 claims description 32
- 239000010959 steel Substances 0.000 claims description 32
- 239000002893 slag Substances 0.000 claims description 25
- 238000001514 detection method Methods 0.000 claims description 14
- 238000000034 method Methods 0.000 claims description 11
- 239000011261 inert gas Substances 0.000 claims description 8
- 239000007789 gas Substances 0.000 description 6
- 238000007789 sealing Methods 0.000 description 6
- 230000007423 decrease Effects 0.000 description 5
- 238000000605 extraction Methods 0.000 description 3
- 238000002847 impedance measurement Methods 0.000 description 3
- 238000000691 measurement method Methods 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- 230000000007 visual effect Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 238000009530 blood pressure measurement Methods 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 238000011109 contamination Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000007654 immersion Methods 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D2/00—Arrangement of indicating or measuring devices, e.g. for temperature or viscosity of the fused mass
- B22D2/001—Arrangement of indicating or measuring devices, e.g. for temperature or viscosity of the fused mass for the slag appearance in a molten metal stream
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Continuous Casting (AREA)
Description
【発明の詳細な説明】
（産業上の利用分野）
本発明は１次容器から２次容器へ溶鋼を流下さ
せる際の流下末期において、１次容器からのスラ
グの流出を検知し、流下を停止することで、２次
容器へのスラグの流入量を最小限にとどめるに際
してのスラグ流出検知法に関するものである。Detailed Description of the Invention (Field of Industrial Application) The present invention detects the outflow of slag from the primary container at the end of the flow when molten steel flows down from the primary container to the secondary container, and stops the flow. This invention relates to a slag outflow detection method for minimizing the amount of slag flowing into a secondary container.
（従来の技術）
溶鋼流へのスラグ混入検知に際し従来技術とし
ては、通常実施されている目視判定法の他に、自
動検知法として振動測定法やインピーダンス測定
法等があつた。例えば振動測定法としては“鉄と
鋼”’81−S847「CC・取鍋スラグ流出の検知装置
の開発」にその一例が記載されており、又、イン
ピーダンス測定法としては“鉄と鋼”’80−5813
「取鍋シールノズル使用時のスラグ流出防止装置」
の中に述べられている。しかしながら、目視判定
法は、判定者の個人差によるばらつきが生じる上
に、密閉型タンデイツシユのように注入部が見え
ない場合に判定できないという欠点を有してい
た。また、振動測定法やインピーダンス測定法
は、センサーを流入流に近接させる必要があり、
保守性や操作性に問題がある上、設備が大がかり
で高価となる欠点を有していた。(Prior Art) Conventional technologies for detecting slag intrusion into a molten steel flow include, in addition to the commonly used visual judgment method, automatic detection methods such as a vibration measurement method and an impedance measurement method. For example, an example of a vibration measurement method is described in "Tetsu to Hagane"'81-S847"Development of a detection device for CC/ladle slag outflow", and an example of an impedance measurement method is described in "Tetsu to Hagane"'81-S847. 80−5813
"Slag outflow prevention device when using ladle seal nozzle"
It is stated in. However, the visual judgment method has the disadvantage that it causes variations due to individual differences among judges, and that it cannot be judged when the injection part cannot be seen, such as in a closed tundish. In addition, the vibration measurement method and impedance measurement method require the sensor to be placed close to the inflow flow.
In addition to problems with maintainability and operability, this method also had the disadvantage of requiring large-scale and expensive equipment.
（発明の目的）
本発明は、溶鋼を１次容器から２次容器へ流下
する際に、流下末期のスラグ流出を、センサーの
保守性や操作性の問題の無い、非常にシンプルな
装置により自動化し、スラグ流出量を最小限に抑
えるスラグ流出検知法である。(Objective of the invention) The present invention automates the flow of slag at the end of the flow when molten steel flows down from the primary container to the secondary container using a very simple device that does not have problems with sensor maintainability or operability. This is a slag outflow detection method that minimizes the amount of slag outflow.
（発明の構成・作用）
本発明は前述の目的を果す検知方法でありその
要旨とするところは溶鋼１次容器の底部流出部に
一端を接続し、他端を溶鋼２次容器に浸漬し、か
つ内部に不活性ガスを吸込むようにした浸漬ノズ
ルにより１次容器内の溶鋼を２次容器内へ流出す
るに際して、該浸漬ノズルの溶鋼流に直接洗われ
ないノズル壁面に圧力検出手段を接続し、浸漬ノ
ズルの内部圧力を連続的に測定し、その圧力変化
から、スラグ流入を判定することを特徴とする溶
鋼流へのスラグ混入検知方法である。(Structure and operation of the invention) The present invention is a detection method that achieves the above-mentioned purpose, and its gist is that one end is connected to the bottom outflow part of a primary molten steel container, the other end is immersed in a secondary molten steel container, and when the molten steel in the primary container flows out into the secondary container by the immersed nozzle that sucks inert gas into the interior, a pressure detection means is connected to the wall surface of the nozzle that is not directly washed by the molten steel flow of the immersed nozzle, This method of detecting slag intrusion into a molten steel flow is characterized by continuously measuring the internal pressure of a submerged nozzle and determining whether slag has entered from the pressure change.
以下、鋼の連続鋳造における溶鋼鍋からタンデ
イツシユへのスラグ流出の検知を例にとつて本発
明を詳細に説明する。 Hereinafter, the present invention will be described in detail by taking as an example the detection of slag flowing out from a molten steel ladle to a tundish in continuous steel casting.
第１図は本発明の使用状態を示すもので、１は
スラグ、２は溶鋼、３は溶鋼鍋、４は鍋ノズル、
５は１次容器である溶鋼鍋３の底部流出部に一端
を接続し、他端を２次容器であるタンデイツシユ
に浸漬し、かつ内部にシール用不活性ガスを吸込
むようにした浸漬ノズル（以下これをシール用ロ
ングノズルと云う）、６はタンデイツシユ、、７は
シール用ロングノズルの溶鋼流に直接洗われない
ノズル壁面に接続された圧力取出し配管、８は圧
力発信器であり、圧力取出し配管７と圧力発信器
で圧力検出手段を構成する。一般に鍋３からタン
デイツシユ６へ溶鋼を移し換える場合、再酸化や
吸窒を防止するため、鍋からの溶鋼流下流を大気
から遮断すべく、ロングノズル５を例えばこの図
のように鍋ノズル４に圧着し、内部を不活性ガス
でパージする構造をとつている。本発明は、この
ようなシール用ロングノズル５から圧力配管７を
取り出し、ノズル内の不活性ガスの静圧を連続的
に測定し、その圧力レベル及び圧力変動から、ス
ラグの流出を検知する検知法である。 Fig. 1 shows the state of use of the present invention, where 1 is a slag, 2 is a molten steel, 3 is a molten steel ladle, 4 is a ladle nozzle,
Reference numeral 5 denotes an immersed nozzle (hereinafter referred to as "immersion nozzle") which has one end connected to the bottom outflow part of the molten steel ladle 3 which is the primary container, and whose other end is immersed in the tundish which is the secondary container, and which sucks a sealing inert gas into the inside. is referred to as a long sealing nozzle), 6 is a tundish, 7 is a pressure extraction pipe connected to the nozzle wall that is not directly washed by the molten steel flow of the long sealing nozzle, 8 is a pressure transmitter, and pressure extraction piping 7 and a pressure transmitter constitute a pressure detection means. Generally, when transferring molten steel from the ladle 3 to the tundish 6, a long nozzle 5 is connected to the ladle nozzle 4 as shown in this figure in order to block the downstream flow of molten steel from the ladle from the atmosphere in order to prevent re-oxidation and nitrification. It has a structure in which it is crimped and the inside is purged with inert gas. The present invention takes out the pressure pipe 7 from such a long sealing nozzle 5, continuously measures the static pressure of the inert gas inside the nozzle, and detects the outflow of slag from the pressure level and pressure fluctuation. It is the law.
第２図は、ロングノズル部の拡大図で、９が溶
鋼流下流である。鍋から鍋ノズル４を介して流下
した溶鋼は、その運動エネルギーのために、ロン
グノズル５内の湯面で不活性ガスを巻き込み、そ
のまま同伴してノズル外に持ち去る。このため、
溶鋼流下中には、ロングノズル５内部のガス圧力
は常に負圧に保たれている。ところが、流下流に
スラグが流入すると、流下液体の密度が低下する
こと及び、粘性が増し流量自体が低下することか
ら、流下運動エネルギーが低下し、不活性ガスを
巻き込む量も低下する。このことにより、ロング
ノズル５内のガスの負圧の程度が小さくなり、こ
れを圧力配管７を介して検知する。すなわち、溶
鋼流に直接洗われないロングノズル壁面に、圧力
配管７を設けノズル内ガス圧力を測定中、負圧レ
ベルがある程度以下になつた時、あるいは急激に
負圧レベルが低下した時をもつてスラグ流出と
し、これを検知する。４と５のシール性にもよる
が、負圧レベルが100mm水柱程度減少した場合ス
ラグ混入判定の一つの基準としている。この基準
は溶鋼流出装置の流出の条件にもとづき適宜に設
定するものである。 FIG. 2 is an enlarged view of the long nozzle section, and numeral 9 is downstream of the molten steel flow. The molten steel flowing down from the ladle through the ladle nozzle 4 entrains inert gas on the surface of the long nozzle 5 due to its kinetic energy, and is carried away with it to the outside of the nozzle. For this reason,
While the molten steel is flowing down, the gas pressure inside the long nozzle 5 is always maintained at negative pressure. However, when slag flows downstream, the density of the flowing liquid decreases, the viscosity increases, and the flow rate itself decreases, so the flowing kinetic energy decreases and the amount of inert gas involved also decreases. This reduces the degree of negative pressure of the gas within the long nozzle 5, and this is detected via the pressure pipe 7. In other words, when the pressure piping 7 is installed on the long nozzle wall surface that is not directly washed by the molten steel flow and the gas pressure inside the nozzle is being measured, the negative pressure level drops below a certain level, or when the negative pressure level suddenly drops. This is detected as a slag outflow. Although it depends on the sealing performance of 4 and 5, one criterion for determining slag contamination is when the negative pressure level decreases by about 100 mm of water column. This standard is appropriately set based on the conditions of outflow from the molten steel outflow device.
（実施例）
第１図に示した方法で、実機に本発明によるス
ラグ流出検知を適用したところ第３図のように従
来の目視判定によるスラグ流出検知より約２秒早
くロングノズル内のガス圧が−100mm水柱程度変
動しており、この時点で１次容器からの溶鋼流下
を停止することでスラグ流出量を大巾に低減でき
る。(Example) When the slag outflow detection according to the present invention was applied to an actual machine using the method shown in Fig. 1, the gas pressure inside the long nozzle was approximately 2 seconds earlier than the conventional visual judgment. The amount of molten steel fluctuates by about -100 mm in the water column, and by stopping the flow of molten steel from the primary vessel at this point, the amount of slag flowing out can be significantly reduced.
さらに、このような方法でロングノズル内のガ
ス圧を測定する場合、圧力配管内への地金差しが
生ずると圧力配管が閉塞し、圧力測定が不可能と
なる。これを回避するため第４図のようにポーラ
スプラグ１０を圧力配管の先端に取り付けても、
良好な検知が可能である。 Furthermore, when measuring the gas pressure in the long nozzle using such a method, if metal is inserted into the pressure piping, the pressure piping will be blocked and pressure measurement will become impossible. In order to avoid this, even if the porous plug 10 is attached to the tip of the pressure pipe as shown in Fig. 4,
Good detection is possible.
（発明の効果）
本発明は上記のごとくロングノズル内のガス圧
力を測定し、その圧力レベルや圧力変動からスラ
グの流出を検知するという非常にシンプルな装置
による検知法であり、特に大きな設備改造なく容
易に実機に組み込める。また、ノズル内壁への地
金付着や鍋交換に伴なうノズル内洗浄等によつて
も何ら悪影響を受けず、キヤスト全体を通して安
定してスラグ流出検知の自動化を図れる優れた効
果を示す方法である。(Effects of the Invention) As described above, the present invention is a detection method using a very simple device that measures the gas pressure inside the long nozzle and detects the outflow of slag from the pressure level and pressure fluctuation. It can be easily integrated into actual equipment. In addition, this method shows an excellent effect in that it is not affected by metal adhesion to the inner wall of the nozzle or cleaning the inside of the nozzle when changing the pot, and can stably automate the detection of slag flow throughout the entire cast. be.
第１図は本発明の実施態様例を示す断面図、第
２図は、同上圧力測定部の断面図、第３図は実機
に適用したスラグ流出検知結果の一例を示す図、
第４図は第３図の圧力取出し部の拡大断面図であ
る。
１……スラグ、２……溶鋼、３……溶鋼鍋、４
……鍋ノズル、５……シール用ロングノズル、６
……タンデイツシユ、７……圧力取出し配管、８
……圧力発信機、９……溶鋼流下流、１０……地
金侵入防止用ポーラスプラグ、１１……不活性ガ
ス吹付管。
FIG. 1 is a cross-sectional view showing an embodiment of the present invention, FIG. 2 is a cross-sectional view of the same pressure measuring section, and FIG. 3 is a view showing an example of slag outflow detection results applied to an actual machine.
FIG. 4 is an enlarged sectional view of the pressure take-off portion of FIG. 3. 1... Slag, 2... Molten steel, 3... Molten steel pot, 4
... Pot nozzle, 5 ... Long nozzle for sealing, 6
……Tandate pipe, 7…Pressure extraction piping, 8
... Pressure transmitter, 9 ... Molten steel flow downstream, 10 ... Porous plug for preventing metal intrusion, 11 ... Inert gas blowing pipe.
Claims (1)
他端を溶鋼２次容器に浸漬し、かつ内部に不活性
ガスを吸込むようにした浸漬ノズルにより１次容
器内の溶鋼を２次容器内へ流出するに際して、該
浸漬ノズルの溶鋼流に直接洗われないノズル壁面
に圧力検出手段を接続し、浸漬ノズルの内部圧力
を連続的に測定し、その圧力変化から、スラグ流
入を判定することを特徴とする溶鋼流へのスラグ
混入検知方法。1 Connect one end to the bottom outflow part of the primary molten steel container,
When the molten steel in the primary container flows out into the secondary container by an immersed nozzle whose other end is immersed in a secondary molten steel container and which sucks inert gas into the interior, the molten steel flow from the immersed nozzle directly washes the molten steel. 1. A method for detecting slag intrusion into a molten steel flow, which comprises: connecting a pressure detection means to a wall surface of a immersed nozzle, continuously measuring the internal pressure of a submerged nozzle, and determining slag inflow based on changes in pressure.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10481685A JPS61262454A (en) | 1985-05-16 | 1985-05-16 | Detection of slag intrusion into molten steel flow |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10481685A JPS61262454A (en) | 1985-05-16 | 1985-05-16 | Detection of slag intrusion into molten steel flow |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS61262454A JPS61262454A (en) | 1986-11-20 |
| JPH0328257B2 true JPH0328257B2 (en) | 1991-04-18 |
Family
ID=14390929
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP10481685A Granted JPS61262454A (en) | 1985-05-16 | 1985-05-16 | Detection of slag intrusion into molten steel flow |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS61262454A (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0688127B2 (en) * | 1988-03-09 | 1994-11-09 | 川崎製鉄株式会社 | Slag outflow detection method |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5831021A (en) * | 1981-08-19 | 1983-02-23 | Kawasaki Steel Corp | Slag outflow preventing method in case of charging |
-
1985
- 1985-05-16 JP JP10481685A patent/JPS61262454A/en active Granted
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5831021A (en) * | 1981-08-19 | 1983-02-23 | Kawasaki Steel Corp | Slag outflow preventing method in case of charging |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS61262454A (en) | 1986-11-20 |
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