JPS5933166B2 - Slot cutting method in converter during tapping - Google Patents
Slot cutting method in converter during tappingInfo
- Publication number
- JPS5933166B2 JPS5933166B2 JP15406380A JP15406380A JPS5933166B2 JP S5933166 B2 JPS5933166 B2 JP S5933166B2 JP 15406380 A JP15406380 A JP 15406380A JP 15406380 A JP15406380 A JP 15406380A JP S5933166 B2 JPS5933166 B2 JP S5933166B2
- Authority
- JP
- Japan
- Prior art keywords
- tapping
- converter
- molten steel
- back pressure
- inert gas
- 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
Links
- 238000010079 rubber tapping Methods 0.000 title claims description 38
- 238000000034 method Methods 0.000 title claims description 9
- 229910000831 Steel Inorganic materials 0.000 claims description 25
- 239000010959 steel Substances 0.000 claims description 25
- 239000011261 inert gas Substances 0.000 claims description 18
- 238000001514 detection method Methods 0.000 claims description 14
- 239000002893 slag Substances 0.000 description 15
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 10
- 239000007789 gas Substances 0.000 description 6
- 230000007423 decrease Effects 0.000 description 5
- 229910052742 iron Inorganic materials 0.000 description 5
- 230000003068 static effect Effects 0.000 description 5
- 238000004513 sizing Methods 0.000 description 3
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 2
- 238000007664 blowing Methods 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000002347 injection Methods 0.000 description 2
- 239000007924 injection Substances 0.000 description 2
- 230000002411 adverse Effects 0.000 description 1
- 229910052786 argon Inorganic materials 0.000 description 1
- 230000005587 bubbling Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000001307 helium Substances 0.000 description 1
- 229910052734 helium Inorganic materials 0.000 description 1
- SWQJXJOGLNCZEY-UHFFFAOYSA-N helium atom Chemical compound [He] SWQJXJOGLNCZEY-UHFFFAOYSA-N 0.000 description 1
- 238000011017 operating method Methods 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 239000002344 surface layer Substances 0.000 description 1
- 230000000007 visual effect Effects 0.000 description 1
Description
【発明の詳細な説明】
本発明は、出鋼中の転炉におけるノロ切り方法、特に転
炉において出鋼から出鋼完了までの溶鋼レベル（静鉄圧
）の変化を溶鋼表面から露出しない部分（出鋼口周囲）
から供給する不活性ガスの背圧の変化として検出し、そ
の信号によって出鋼完了の判定をすると共に、不活性ガ
スの背圧信号により転炉の傾動装置を制御する出鋼中の
転炉におけるノロ切り方法に関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for sizing in a converter during steel tapping, and in particular, to a converter, the changes in the molten steel level (static iron pressure) from the time of tapping to the completion of tapping can be measured by measuring the changes in the molten steel level (static iron pressure) in a portion that is not exposed from the surface of the molten steel. (Around the tap hole)
In the converter during tapping, the back pressure of the inert gas supplied from the converter is detected as a change in the back pressure of the inert gas supplied from the converter, and the signal determines the completion of steel tapping. Regarding the method of cutting.
従来から転炉操業において、炉内において生成したノロ
と溶鋼とを分離するいわゆるノロ切りは出鋼口からのノ
ロの流出を目視によって判断し、スラグカットボールを
投入したりする方法によって行われている。Conventionally, in converter operation, so-called slag cutting, which separates the slag generated in the furnace from molten steel, has been carried out by visually determining the outflow of slag from the tapping port and by inserting a slag cutting ball. There is.
しかし、ノロ流出の判定には熟練を要し、特に出鋼完了
直前は、ノロと溶鋼とが混合した形で流出してくるため
、出鋼完了の確実な判断を下すことが困難である。However, skill is required to determine whether the slag has flowed out, and especially just before the tapping is completed, it is difficult to make a reliable judgment as to whether the tapping is complete because the slag and molten steel flow out in a mixed form.
また、ノロ切り方法についてもスラグカットボール等で
は確実性に欠は十分な効果を発揮していない現状である
。In addition, with regard to the slug cutting method, slag cut balls and the like lack reliability and are not sufficiently effective at present.
本発明は、転炉溶鋼中に、出鋼口近傍から不活性ガスを
噴出させ、溶鋼表面層に炉壁に向う流れを生じさせると
共に、この不活性ガスの背圧を測定することによって炉
内の溶鋼レベルを検出し、その信号により炉体傾動装置
の傾動を復起するように制御することにより出鋼中の溶
鋼へのノロのまき込みを防止し、確実にかつ安全に出鋼
中の転炉におけるノロ切り方法を提供しようとするもの
である。In the present invention, an inert gas is ejected from the vicinity of the tapping port during molten steel in a converter to create a flow in the surface layer of the molten steel toward the furnace wall, and the back pressure of this inert gas is measured. By detecting the level of molten steel and controlling the tilting of the furnace body tilting device to restart based on the signal, it is possible to prevent slag from getting into the molten steel during tapping, and to ensure that the molten steel is being tapped safely. This paper attempts to provide a method for sizing in a converter.
すなわち、本発明は転炉出鋼口周囲の出鋼中常時溶鋼が
浸漬する位置に設けたノズルから出鋼中の炉内溶鋼に不
活性ガスを一定流量で供給し、吹込不活性ガスの背圧の
変化を背圧検出部において検知すると共に、その信号に
よって炉体傾動装置の制御部を作動させて炉体を復起さ
せることを特徴とする。That is, the present invention supplies inert gas at a constant flow rate to the molten steel in the furnace during tapping from a nozzle installed around the tap port of the converter in a position where the molten steel is constantly immersed during tapping. It is characterized in that a change in pressure is detected by a back pressure detection section, and a control section of a furnace body tilting device is actuated based on the signal to restore the furnace body.
以下、図面に従って本発明を説明する。The present invention will be explained below with reference to the drawings.
図面は本発明の実施例陣工程図であって、符号１は炉体
支持機構（図示していない）に支持された炉体、２は出
鋼口、３は溶鋼、４はスラグ、５は不活性ガス吹込ノズ
ル、６は不活性ガス配管、７は背圧検出部、８は変換器
、９は炉体傾動装置の制御部、１０はオリフィス、１１
は圧力検出部、１２は変換器、１３は流量調節弁、１４
はガスホールダーを表わす。The drawing is a process diagram of an embodiment of the present invention, in which reference numeral 1 denotes a furnace body supported by a furnace body support mechanism (not shown), 2 a tapping port, 3 a molten steel, 4 a slag, and 5 a furnace body supported by a furnace body support mechanism (not shown). Inert gas blowing nozzle, 6 inert gas piping, 7 back pressure detection unit, 8 converter, 9 control unit for furnace body tilting device, 10 orifice, 11
1 is a pressure detection unit, 12 is a converter, 13 is a flow rate control valve, 14
represents a gas holder.
まず、図面に示すように、炉体１の出鋼口２の近傍にノ
ズル５を配置し、出鋼中の転炉内に不活性ガスを吹き込
む。First, as shown in the drawing, a nozzle 5 is placed near the tapping port 2 of the furnace body 1, and inert gas is blown into the converter during tapping.
ノズル５は配管６を介してガスホールダ−１４に接続さ
れており、またその途中にオリフィス１０、圧力検出部
１１、変換部１２、流量調節弁１３を設け、その圧力検
出部１１で差圧を検出し、変換器１２を介して流量調節
弁１３に圧力信号を供給し、不活性ガス流量を一定に保
つようにする。The nozzle 5 is connected to a gas holder 14 via a pipe 6, and an orifice 10, a pressure detection section 11, a conversion section 12, and a flow rate control valve 13 are provided in the middle, and the pressure detection section 11 detects the differential pressure. Then, a pressure signal is supplied to the flow control valve 13 via the converter 12 to keep the inert gas flow rate constant.
また、ノズル５とオリフィス１０との間の配管６に接続
して設けた背圧検出部７により検出された背圧は変換器
８で電気信号に変換され、炉体傾動装置の制御部９に伝
達され、制御部９において予め設定した出鋼完了後の背
圧に相当する制御値となった場合に炉体傾動装置（図示
していない）を作動させ、炉体１を復起させることによ
ってノロ切りをする。Further, the back pressure detected by the back pressure detection unit 7 connected to the piping 6 between the nozzle 5 and the orifice 10 is converted into an electric signal by the converter 8, and the back pressure is sent to the control unit 9 of the furnace tilting device. When the control unit 9 reaches a control value corresponding to the back pressure after the completion of tapping, the furnace body tilting device (not shown) is activated and the furnace body 1 is restarted. Make a sawing cut.
本発明において、ホールダー１４は、十分容量を持つ不
活性ガスのホールダーであり、また、不活性ガスとは溶
鋼に悪影響を及ぼさないものであればよく、その具体例
としては、アルゴンガス、ヘリウムガスなどがあげられ
る。In the present invention, the holder 14 is an inert gas holder with sufficient capacity, and the inert gas may be any gas that does not have an adverse effect on molten steel. Specific examples include argon gas, helium gas, etc. etc. can be mentioned.
また、出鋼口付近に設けた不活性ガスのノズル５は出鋼
中宮に溶鋼に浸漬する位置（出鋼口周囲）にその先端が
転炉炉壁面に同位置となるように複数個間隔をおいて配
設する。In addition, a plurality of inert gas nozzles 5 installed near the tapping port are placed at intervals so that their tips are at the same position on the converter wall surface at the position where they are immersed in the molten steel (around the tapping port). and place it.
次に本発明の操作方法について説明する。Next, the operating method of the present invention will be explained.
吹錬完了と同時に炉体１は傾動装置によって傾動され、
出鋼を開始するか、傾動前に予め不活性ガスを噴出させ
、ノズルの目詰りや焼損を防止する。At the same time as blowing is completed, the furnace body 1 is tilted by a tilting device,
Start tapping or blow out inert gas before tilting to prevent nozzle clogging and burnout.
この時、所定のガス流量が得られるように圧力検出部１
１に設定圧ΔＰｏを与えておく。At this time, the pressure detection unit 1
1 is given a set pressure ΔPo.
出鋼中は溶鋼レベル（静鉄圧）が作用し流量が低下する
方向に向うが、流量低下に伴うオリフィス１０前後の圧
力差の低下によって流量調節弁１３が作動し、静鉄圧が
作用した場合でも流量が一定に保つようになる。During tapping, the molten steel level (static iron pressure) acts and the flow rate tends to decrease, but as the flow rate decreases, the pressure difference across the orifice 10 decreases, the flow control valve 13 is activated, and the static iron pressure acts. The flow rate will be kept constant even in the case of
なお、この時背圧検出部７で検出される背圧Ｐは静鉄圧
に相当する分だけ高くなる。Note that at this time, the back pressure P detected by the back pressure detection section 7 increases by an amount corresponding to the static iron pressure.
出鋼が進むにつれて、炉内の溶鋼量が減少してくると背
圧検出部７で検出される背圧Ｐも低下し、出鋼完了時に
はスラグ４による圧力分だけとなる。As tapping progresses, the amount of molten steel in the furnace decreases, and the back pressure P detected by the back pressure detector 7 also decreases, and when tapping is completed, only the pressure due to the slag 4 is present.
背圧検出部７で検出した背圧Ｐは変換器８を介して電気
信号として傾動装置制御部９に伝達される。The back pressure P detected by the back pressure detection section 7 is transmitted to the tilting device control section 9 as an electric signal via the converter 8.
制御部９は予め出鋼完了時の背圧に相当する制御値を設
定しておき、出鋼完了を検知すると同時に炉体傾動装置
を作動させて炉体１を復起させノロ切りを行う。The control unit 9 sets in advance a control value corresponding to the back pressure at the time of completion of tapping, and at the same time as detecting the completion of tapping, operates the furnace body tilting device to restore the furnace body 1 and perform slag cutting.
また、出鋼中の不活性ガス吹込によって出鋼口２の周囲
にバブリング領域Ａが生じ、この攪拌流によって出鋼口
周囲のノロを排除し、出鋼流へのノロの巻込みを防止す
ることができる。In addition, a bubbling region A is created around the tapping port 2 by inert gas injection during tapping, and this stirring flow eliminates slag around the tapping port and prevents slag from being entrained in the tapping flow. be able to.
以上説明したように、本発明は転炉の出鋼口周囲に不活
性ガスの吹込ノズルを設け、出鋼中このノズルから不活
性ガスを噴出させ、炉内溶鋼量の変化に伴う吹込ガス背
圧の変化を検出することによって出鋼完了を検知するこ
とにより、転炉内のノロ切りを行う方法であって、従来
の目視による検知方法に比べて確実でかつ安定に出鋼完
了の判定を下すことが可能であり、また背圧の検出信号
を炉体傾動の制御部に伝達することによって炉体傾動に
よるノロ切りが可能であり、更に出鋼完了の判定基準を
適宜設定することによって取鍋内のスラグ量のコントロ
ールも可能である。As explained above, the present invention provides an inert gas injection nozzle around the tapping port of a converter, blows out the inert gas from this nozzle during tapping, and backs up the blown gas as the amount of molten steel in the furnace changes. This is a method for sizing inside a converter by detecting the completion of steel tapping by detecting changes in pressure, and it is more reliable and stable in determining the completion of steel tapping than the conventional visual detection method. In addition, by transmitting the back pressure detection signal to the furnace body tilting control unit, it is possible to perform sloping by tilting the furnace body, and furthermore, by setting appropriate criteria for determining the completion of tapping, it is possible to It is also possible to control the amount of slag in the pot.
図面は本発明の実施例の工程図である。
符号、１・・・・・・炉体、２・・・・・・出鋼口、３
・・・・・・溶鋼、４・・・・・・スラグ、５・・・・
・・ノスル、６・・・・・・配管、７・・・・・・背圧
検出部、８，１２・・・・・・変換部、９・・・・・・
制御部、１０・・・・・・オリフィス、１１・・・・・
・圧力検出部、１３・・・・・・流量調節弁、１４・・
・・・・ホールダー。The drawings are process diagrams of embodiments of the present invention. Code, 1...Furnace body, 2...Tapping port, 3
...molten steel, 4...slag, 5...
... Nostle, 6 ... Piping, 7 ... Back pressure detection section, 8, 12 ... Conversion section, 9 ...
Control unit, 10... Orifice, 11...
・Pressure detection unit, 13...Flow rate control valve, 14...
...Holder.
Claims (1)
設けたノズルから出鋼中の炉内溶鋼に不活性ガスを一定
流量で供給し、吹込不活性ガスの背圧の変化を背圧検出
部において検知すると共にその信号によって炉体傾動装
置の制御部を作動させて炉体を復起させることを特徴と
する出鋼中の転炉におけるノロ切り方法。1. Inert gas is supplied at a constant flow rate to the molten steel in the furnace during tapping from a nozzle installed around the converter tap opening in a position where molten steel is constantly immersed during tapping, and changes in the back pressure of the blown inert gas are controlled. A method for sawing in a converter during tapping, characterized by detecting it in a back pressure detection section and operating a control section of a furnace body tilting device based on the signal to restart the furnace body.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15406380A JPS5933166B2 (en) | 1980-10-31 | 1980-10-31 | Slot cutting method in converter during tapping |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15406380A JPS5933166B2 (en) | 1980-10-31 | 1980-10-31 | Slot cutting method in converter during tapping |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5779109A JPS5779109A (en) | 1982-05-18 |
| JPS5933166B2 true JPS5933166B2 (en) | 1984-08-14 |
Family
ID=15576082
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP15406380A Expired JPS5933166B2 (en) | 1980-10-31 | 1980-10-31 | Slot cutting method in converter during tapping |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5933166B2 (en) |
Families Citing this family (2)
| 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 |
| KR100635780B1 (en) | 1999-12-30 | 2006-10-17 | 주식회사 포스코 | Slag leakage prevention method during converter and tapping including gas spray nozzle for forming gas curtain |
-
1980
- 1980-10-31 JP JP15406380A patent/JPS5933166B2/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5779109A (en) | 1982-05-18 |
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