JP6347200B2 - Top blowing lance device for RH vacuum degassing equipment - Google Patents
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本発明は、ＲＨ真空脱ガス設備の上吹きランス装置に関するものである。 The present invention relates to an upper blowing lance device for RH vacuum degassing equipment.
ＲＨ真空脱ガス設備では、取鍋内の溶鋼中に浸漬した２本の管（浸漬管）の内の一方（上昇管）にアルゴンガスを吹き込むことにより、上昇管内の溶鋼を真空槽内に上昇させ、溶鋼を真空槽内で真空に曝したのち、他方の管（下降管）をから取鍋中に戻し、この還流（上昇管〜真空槽〜下降管〜取鍋〜上昇管）を繰り返しながら、最終精錬を行っている。 In the RH vacuum degassing equipment, the molten steel in the riser is raised into the vacuum chamber by blowing argon gas into one (rising pipe) of the two pipes (immersion pipe) immersed in the molten steel in the ladle. After the molten steel is exposed to vacuum in the vacuum tank, the other pipe (downcomer pipe) is returned to the ladle and this reflux (ascending pipe-vacuum tank-downcomer-ladle-ascending pipe) is repeated. The final refining is done.
このようなＲＨ真空脱ガス設備を用いた溶鋼の精錬過程において、溶鋼の温度調節や精錬の効率改善を目的として、ＲＨ真空脱ガス設備に上吹きランス装置を設ける技術が各種開示されている。ＲＨ脱ガス設備における上吹きランスは、通常、真空槽の上蓋中央に設置したシール孔を介して真空槽内に挿入されて鉛直に昇降し、真空槽底面の中心部に向けて鉛直下向きにガスを吹き付ける構造が一般的であるが、特許文献１には、上吹きランスから上昇管側に向けて酸素含有ガスを吹きつけることにより、火点（酸素含有ガスジェットが真空槽内の溶鋼浴面に吹き付けられている領域）を真空槽の中心点から上昇管側の還流ガス気泡による強撹拌領域に近づけ、火点において反応に寄与する溶鋼の供給速度を大きくする技術が開示されている。 In the refining process of molten steel using such an RH vacuum degassing facility, various techniques for providing an upper blow lance device in the RH vacuum degassing facility for the purpose of adjusting the temperature of the molten steel and improving the efficiency of refining have been disclosed. The upper blowing lance in the RH degassing facility is usually inserted into the vacuum chamber through a seal hole installed in the center of the upper lid of the vacuum chamber, and moves vertically up and down, and gas is directed vertically downward toward the center of the vacuum chamber bottom. However, Patent Document 1 discloses that an oxygen-containing gas is blown from the top blowing lance toward the riser side, whereby a fire point (the oxygen-containing gas jet is in the molten steel bath surface in the vacuum chamber). A technique is disclosed in which the region sprayed on the top of the vacuum tank is moved closer to the strong stirring region by the reflux gas bubbles on the riser side from the center point of the vacuum chamber, and the supply rate of molten steel contributing to the reaction at the fire point is increased.
また、ＲＨ真空脱ガス設備では、上昇側の還流管（上昇管）の方が、下降側の還流管（下降管）に比べて耐火物損耗速度が大きいため、２本の還流管を交互に上昇管として使用して耐火物寿命の延長を図ることが一般的であるため、特許文献１には、２本の還流管を交互に上昇管として使用することを前提とした上で、上吹きランスから上昇管側に向けて酸素含有ガスを吹きつける技術として、酸素含有ガスジェットの噴出方向を変更可能とする技術も開示されている。具体的には、特許文献１では、酸素含有ガスジェットの噴出方向を変更可能とする手段として、上吹きランスの先端に設けたノズルの内壁に作動ガス出口を設けて、酸素含有ガス（主ガス）と直交するように作動ガスを噴出する方法を採用している。 Also, in the RH vacuum degassing equipment, the rising reflux pipe (rising pipe) has a higher refractory wear rate than the descending reflux pipe (falling pipe). Since it is common to extend the life of the refractory by using it as an ascending pipe, in Patent Document 1, it is assumed that two reflux pipes are used alternately as an ascending pipe, As a technique for blowing the oxygen-containing gas from the lance toward the ascending pipe, a technique that can change the jet direction of the oxygen-containing gas jet is also disclosed. Specifically, in Patent Document 1, as means for enabling the change of the jet direction of the oxygen-containing gas jet, a working gas outlet is provided on the inner wall of the nozzle provided at the tip of the upper blowing lance, and the oxygen-containing gas (main gas) ) Is used to eject the working gas so as to be orthogonal to.
しかし、上記のように、上吹きランスの先端に設けたノズルの内壁に作動ガス出口を設ける場合には、上吹きランス内に主ガス用配管の他に、作動ガス用配管を設置する必要があるが、既存の上吹きランス内には、前記の主ガス用配管の他、大量の冷却水を循環させるための水路も配設されており、通常、新たに作動ガス用配管を増設する余裕はない。したがって、特許文献１の技術では、上吹きランス自体も径の大きいものに変更することが求められ、これに付随して建屋基礎の補強等大幅な改造も必要となり、投資対効果が見合わないという問題があった。 However, when the working gas outlet is provided on the inner wall of the nozzle provided at the tip of the top blowing lance as described above, it is necessary to install a working gas pipe in addition to the main gas pipe in the top blowing lance. However, in the existing top blowing lance, in addition to the main gas pipe, there is also a water channel for circulating a large amount of cooling water. Usually, there is room for adding a new working gas pipe. There is no. Therefore, in the technique of Patent Document 1, it is required to change the top blowing lance itself to one having a large diameter, and this is accompanied by a significant modification such as reinforcement of the building foundation, and the return on investment is not commensurate. There was a problem.
本発明の目的は前記の問題を解決し、ＲＨ真空脱ガス設備において、上吹きランス径を拡張することなく、ガスジェットの噴出方向を変更自在とする技術を提供することである。 An object of the present invention is to solve the above-mentioned problems and to provide a technique that allows the jet direction of a gas jet to be changed in an RH vacuum degassing facility without expanding the upper blowing lance diameter.
上記課題を解決するためになされた本発明のＲＨ真空脱ガス設備の上吹きランス装置は、先端にラバールノズルを備えた上吹きランス内に、鉛直方向のガス流路を複数配置し、該ガス流路の末端部と前記ラバールノズルの上端部を繋ぐ絞り部を備え、前記の各ガス流路のガス流量を、各ガス流路ごとに調節自在とするガス流量調節手段を備えることを特徴とするものである。 In order to solve the above-mentioned problems, an RH vacuum degassing equipment top blowing lance device of the present invention has a plurality of vertical gas flow paths arranged in a top blowing lance having a laval nozzle at the tip, A throttle part connecting the end part of the path and the upper end part of the Laval nozzle is provided, and gas flow rate adjusting means is provided to make the gas flow rate of each gas flow path adjustable for each gas flow path. It is.
請求項２記載の発明は、請求項１記載のＲＨ真空脱ガス設備の上吹きランス装置において、前記複数のガス流路が、一本の管状体の円筒状内部を隔壁で分割して形成された複数のガス流路であることを特徴とするものである。 According to a second aspect of the present invention, in the top blow lance device of the RH vacuum degassing facility according to the first aspect, the plurality of gas flow paths are formed by dividing a cylindrical interior of a single tubular body by partition walls. It is also characterized by being a plurality of gas flow paths.
請求項３記載の発明は、請求項２記載のＲＨ真空脱ガス設備の上吹きランス装置において、前記隔壁は、一本の管状体の円筒状内部を左右２つの流路に分割する隔壁であることを特徴とするものである。 According to a third aspect of the present invention, in the top blowing lance device of the RH vacuum degassing facility according to the second aspect, the partition wall is a partition wall that divides the cylindrical interior of one tubular body into two left and right flow paths. It is characterized by this.
本発明に係ＲＨ真空脱ガス設備の上吹きランス装置は、先端にラバールノズルを備えた上吹きランス内に、鉛直方向のガス流路を複数配置し、該ガス流路の末端部と前記ラバールノズルの上端部を繋ぐ絞り部を備え、前記の各ガス流路のガス流量を、各ガス流路ごとに調節自在とするガス流量調節手段を備えるため、各ガス流路に流すガス流量を調節し、絞り部で合流するガスの流れの方向を自在に変更することができる。すなわち、本発明によれば、特許文献１のように、作動ガスを用いることなく、主ガスのみを使用して、絞り部で合流するガスの流れの方向を自在に変更することができるため、上吹きランス径を拡張して作動ガス用配管を増設する必要がなく、簡易な手法でラバールノズルから噴出されるガスジェットの噴出方向を変更自在とすることができる。 An upper blowing lance device of the RH vacuum degassing facility according to the present invention has a plurality of vertical gas flow paths arranged in an upper blowing lance provided with a Laval nozzle at the tip, the end of the gas flow path and the Laval nozzle. In order to provide a gas flow rate adjusting means for adjusting the gas flow rate of each gas flow path for each gas flow path, including the throttle part connecting the upper end portions, the flow rate of gas flowing through each gas flow path is adjusted, It is possible to freely change the flow direction of the gas that joins at the throttle portion. That is, according to the present invention, as in Patent Document 1, it is possible to freely change the flow direction of the gas to be merged at the throttle portion using only the main gas without using the working gas. It is not necessary to expand the upper blowing lance diameter to increase the working gas piping, and the jet direction of the gas jet ejected from the Laval nozzle can be changed by a simple method.
請求項２記載の発明のように、一本の管状体の円筒状内部を隔壁で分割して複数のガス流路を形成する構成とすることにより、従来の上吹きランス内に隔壁を追加するという更に簡易な手法でラバールノズルから噴出されるガスジェットの噴出方向を変更自在とすることができる。 According to a second aspect of the present invention, by dividing the cylindrical interior of one tubular body with the partition walls to form a plurality of gas flow paths, the partition walls are added to the conventional upper blowing lance. In this way, the jet direction of the gas jet ejected from the Laval nozzle can be changed freely.
以下に本発明の好ましい実施形態を示す。 Preferred embodiments of the present invention are shown below.
図１において、１はＲＨ真空脱ガス設備、２は上吹きランス装置である。上吹きランス装置２は、一本の管状体の円筒状内部を左右２つの流路に分割する隔壁３で分割して形成された２つのガス流路４、５と、末広型のラバールノズル６と、ガス流路４、５の末端部と前記ラバールノズル６の上端部を繋ぐ絞り部７から構成されている。本実施形態では、絞り部７の下端は、ストレート部８を介してラバールノズル６の上端部と繋がっている。 In FIG. 1, 1 is an RH vacuum degassing facility, and 2 is an upper blowing lance device. The top blowing lance device 2 includes two gas flow paths 4 and 5 formed by dividing a cylindrical interior of a tubular body into two right and left flow paths 3, a divergent type Laval nozzle 6, and the like. The throttle part 7 connects the end parts of the gas flow paths 4 and 5 and the upper end part of the Laval nozzle 6. In the present embodiment, the lower end of the throttle portion 7 is connected to the upper end portion of the Laval nozzle 6 via the straight portion 8.
なお、ＲＨ脱ガス設備１における上吹きランス装置２は、設備の特性として溶鋼のスプラッシュを避けるために浴面からの距離を大きくとって配置されるが、ラバールノズル６は、この様な条件下でも、十分な運動エネルギーを持ってガスジェットを浴面に到達するように、ノズルの背圧と雰囲気圧力から開口比を適切に設計されている。 The top blowing lance device 2 in the RH degassing facility 1 is arranged with a large distance from the bath surface in order to avoid splash of molten steel as a characteristic of the facility, but the Laval nozzle 6 can be used even under such conditions. The aperture ratio is designed appropriately from the back pressure of the nozzle and the atmospheric pressure so that the gas jet reaches the bath surface with sufficient kinetic energy.
２つのガス流路４、５には、それぞれ、ガス流量計を備え、各ガス流路４、５のガス流量を設置した流調弁の開度によって、調節自在とするガス流量調節手段を備えている。 Each of the two gas flow paths 4 and 5 is provided with a gas flow meter, and a gas flow rate adjusting means that can be adjusted by the opening degree of a flow control valve in which the gas flow rates of the gas flow paths 4 and 5 are installed. ing.
例えば、図２に示すように、ガス流路４のガス流量（Ａ）を、ガス流路５のガス流量（Ｂ）より多く調節すると、各ガス流路を出で、絞り部７で合流したガスは、絞り部７内で図２の紙面右方向に向かう流れを形成する。この右方向のガス流れは、ストレート部８もしくはラバールノズル６の左側壁にぶつかっって反射し、図２の紙面左方向に向かう流れを形成し、ラバールノズル６の開口部９から噴出されるガスジェットの噴出方向は、紙面左方向となる。） For example, as shown in FIG. 2, when the gas flow rate (A) of the gas flow channel 4 is adjusted to be larger than the gas flow rate (B) of the gas flow channel 5, the gas flow channels are exited and joined by the throttle unit 7. The gas forms a flow toward the right in the drawing of FIG. The gas flow in the right direction is reflected by colliding with the straight portion 8 or the left side wall of the Laval nozzle 6 to form a flow toward the left side in FIG. 2, and the gas jet ejected from the opening 9 of the Laval nozzle 6 The ejection direction is the left direction of the paper. )
また、図３に示すように、ガス流路４のガス流量（Ａ）を、ガス流路５のガス流量（Ｂ）より少なく調節すると、各ガス流路を出で、絞り部７で合流したガスは、絞り部７内で図３の紙面左方向に向かう流れを形成し、ラバールノズル６の開口部９から噴出されるガスジェットの噴出方向は、紙面右方向となり、図４に示すように、ガス流路４のガス流量と、ガス流路５のガス流量が均等となるように調節すると、絞り部７で合流したガスは、絞り部７内で鉛直直下に向かう流れを形成し、ラバールノズル６の開口部９から噴出されるガスジェットの噴出方向は、鉛直直下方向となる。 Further, as shown in FIG. 3, when the gas flow rate (A) of the gas flow path 4 is adjusted to be less than the gas flow rate (B) of the gas flow path 5, each gas flow path is exited and merged at the throttle unit 7. The gas forms a flow toward the left side in FIG. 3 in the throttle unit 7, and the jet direction of the gas jet ejected from the opening 9 of the Laval nozzle 6 is the right side of the page, as shown in FIG. When the gas flow rate in the gas flow path 4 and the gas flow rate in the gas flow path 5 are adjusted to be equal, the gas merged in the throttle unit 7 forms a flow that goes directly below the throttle unit 7, and the Laval nozzle 6 The jet direction of the gas jet ejected from the opening 9 is a vertically downward direction.
このように、一本の管状体の円筒状内部を隔壁で分割して複数のガス流路を形成する構成とすることにより、従来の上吹きランス内に隔壁を追加するという更に簡易な手法でラバールノズルから噴出されるガスジェットの噴出方向を変更自在とすることができる。 In this way, by forming a plurality of gas flow paths by dividing the cylindrical interior of one tubular body by partition walls, a simpler method of adding partition walls to the conventional upper blowing lance is achieved. The ejection direction of the gas jet ejected from the Laval nozzle can be changed freely.
本実施形態では、一本の管状体３の円筒状内部を左右２つの流路に分割する隔壁３で分割して形成された２つのガス流路４、５を形成したが、一本の管状体の内部を２枚以上の隔壁により４本以上のガス流路を形成したり、一本の管状体の円筒状内部に、複数のパイプを配置して複数のガス流路を形成し、それぞれのガス流路ごとにガス流量を調節自在とするガス流量調節手段を備えることもできる。何れの場合も、特許文献１のように、作動ガスを用いることなく、主ガスのみを使用して、絞り部で合流するガスの流れの方向を自在に変更することができるため、上吹きランス径を拡張して作動ガス用配管を増設する必要がなく、簡易な手法でラバールノズルから噴出されるガスジェットの噴出方向を変更自在とすることができる。 In the present embodiment, the two gas flow paths 4 and 5 formed by dividing the cylindrical interior of the single tubular body 3 by the partition walls 3 that are divided into the two right and left flow paths are formed. 4 or more gas flow paths are formed inside the body by two or more partition walls, or a plurality of pipes are arranged inside the cylindrical shape of one tubular body to form a plurality of gas flow paths, A gas flow rate adjusting means that allows the gas flow rate to be adjusted for each gas flow path can be provided. In any case, as in Patent Document 1, the flow direction of the gas joined at the throttle portion can be freely changed using only the main gas without using the working gas. There is no need to expand the diameter and increase the number of working gas pipes, and the jet direction of the gas jet ejected from the Laval nozzle can be changed by a simple method.
図５には、ガスジェットの噴出角度αと、左右のガス流路のガス流量の比率との関係を調べたグラフを示している。このグラフは、図１に示すＲＨ真空脱ガス設備において、オフラインテストで、ガス流路４のガス流量とガス流路５のガス流量の比率を変化させた場合の、ガスジェットの噴出角度αの変化を調査して得たものである。図５に示すように、流量比Ａ/（Ａ＋Ｂ）＝０．５を境として、０．５より大きくすると吐出噴流は、図１の紙面左方向に向かう流れを形成して、ランスの広がり角度でサチュレートすること、および、０．５より小さくすると吐出噴流は、図１の紙面右方向に向かう流れを形成して、ランスの広がり角度でサチュレートすることが確認された。 FIG. 5 shows a graph in which the relationship between the jet angle α of the gas jet and the ratio of the gas flow rates in the left and right gas flow paths is examined. This graph shows the ejection angle α of the gas jet when the ratio of the gas flow rate in the gas flow path 4 and the gas flow rate in the gas flow path 5 is changed in the off-line test in the RH vacuum degassing facility shown in FIG. It was obtained by investigating changes. As shown in FIG. 5, when the flow rate ratio A / (A + B) = 0.5 is used as a boundary, the discharge jet forms a flow toward the left side of the drawing in FIG. It was confirmed that the discharge jet flow saturates at a lance spread angle by forming a flow toward the right in FIG.
１ ＲＨ真空脱ガス設備
２ 上吹きランス装置
３ 隔壁
４、５ ガス流路
６ ラバールノズル
７ 絞り部
８ ストレート部
９ 開口部
DESCRIPTION OF SYMBOLS 1 RH vacuum degassing equipment 2 Top blowing lance apparatus 3 Partition 4, 5 Gas flow path 6 Laval nozzle 7 Restriction part 8 Straight part 9 Opening part
Claims (3)
前記の各ガス流路のガス流量を、各ガス流路ごとに調節自在とするガス流量調節手段を備えることを特徴とする
ＲＨ真空脱ガス設備の上吹きランス装置。 A plurality of vertical gas flow paths are arranged in an upper blowing lance provided with a Laval nozzle at the tip, and a throttle part connecting the end of the gas flow path and the upper end of the Laval nozzle is provided.
An upper blowing lance device for RH vacuum degassing equipment, comprising gas flow rate adjusting means for adjusting the gas flow rate of each gas flow channel for each gas flow channel.
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| JP6888492B2 (en) * | 2017-09-12 | 2021-06-16 | 日本製鉄株式会社 | Molten steel refining equipment and molten steel refining method |
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| LU87855A1 (en) * | 1990-12-10 | 1992-08-25 | Arbed | BLOWING LANCE |
| JP2688310B2 (en) * | 1992-08-26 | 1997-12-10 | 新日本製鐵株式会社 | Vacuum degasser |
| AU653294B2 (en) * | 1992-08-26 | 1994-09-22 | Nippon Steel Corporation | Process for vacuum degassing molten steel |
| JP3309301B2 (en) * | 1994-04-15 | 2002-07-29 | 新日本製鐵株式会社 | Converter refining method and refining lance |
| DE4442362C1 (en) * | 1994-11-18 | 1996-04-18 | Mannesmann Ag | Method and appts. for performing a variety of processes on a melt using standard equipment |
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