JPH0514146U - Ascending pipe for vacuum degassing equipment - Google Patents

Abstract

(57)【要約】 【構成】 真空脱ガス設備における上昇管において、上
昇管を構成する最上段煉瓦（２）とそれらの外周に配設
する外巻煉瓦（３）との間の目地部（４）に段差（５）
を設けた構造としたことを特徴とする、真空脱ガス設備
用上昇管であり、最上段煉瓦の浮上防止と目地開きの進
行防止を図り、炉命を大巾に延命できる。 (57) [Summary] [Structure] In a riser pipe in a vacuum degassing facility, joints between the uppermost bricks (2) forming the riser pipe and the outer-wrapping bricks (3) arranged around them ( Step (4) on step (5)
It is a rising pipe for vacuum degassing equipment, which is characterized by having a structure that can prevent the floating of the uppermost bricks and the progress of joint opening, and can prolong the life of the furnace greatly.

Description

【考案の詳細な説明】[Detailed description of the device]

【０００１】[0001]

【産業上の利用分野】[Industrial applications]

本考案は、真空脱ガス設備における上昇管の構造に係り、特に最も浮上破損し 易い最上段煉瓦の背面部に段差を設けた構造とし、寿命を大巾に延命することが 出来る構造に関する。本考案において「上昇管」とは、ＤＨ式真空脱ガス設備の 吸上管及びＲＨ式真空脱ガス設備の上昇管を言う。 The present invention relates to a structure of an ascending pipe in a vacuum degassing facility, and more particularly to a structure in which a step is provided on the back surface of an uppermost brick which is most susceptible to floating damage, so that the life can be greatly extended. In the present invention, the "upcomer pipe" refers to the suction pipe of the DH type vacuum degassing equipment and the rising pipe of the RH type vacuum degassing equipment.

【０００２】[0002]

【従来の技術】[Prior Art]

真空脱ガス設備、とりわけＲＨ式真空脱ガス設備は、複数個の浸漬管を下端部 に備えた下部槽を主体に構成してあり、各部位は夫々の損耗量に応じて適正な材 質を選定し、ライニングが施されている。これら各部ライニングの寿命は、一般 的には溶鋼の流速が最大に達し、気泡の爆裂等もあって最も損傷し易い上昇管開 口部の損傷状態によって支配されることが多い。そして、該部位は、浸漬管のよ うに簡単に交換することが出来ないため、例えば図５および図６に縦断面図を示 すように複数段に分割した最上段の横迫り煉瓦（２）を軸方向に長尺化したり、 あるいは軸方向と共にライニング厚方向にも長尺化して大型形状にする等、種々 な工夫が施されている。また、ＤＨ式真空脱ガス設備の吸上管においても同様で ある。 Vacuum degassing equipment, especially RH type vacuum degassing equipment, is mainly composed of a lower tank equipped with a plurality of immersion pipes at the lower end, and each part is made of an appropriate material according to the amount of wear. Selected and lined. The life of each of these linings is generally dominated by the damage condition of the riser opening, which is most liable to be damaged due to the maximum flow velocity of molten steel and the explosion of bubbles. And since this part cannot be easily replaced like a dip pipe, for example, as shown in the longitudinal sectional views in FIGS. 5 and 6, the uppermost horizontal brick (2) divided into a plurality of stages. Various measures have been taken, such as increasing the length in the axial direction, or increasing the length in the thickness direction of the lining along with the axial direction to form a large shape. The same applies to the suction pipe of the DH type vacuum degassing equipment.

【０００３】[0003]

【考案が解決しようとする課題】[Problems to be solved by the device]

併しながら、周知のように真空脱ガス設備、とりわけＲＨ式真空脱ガス設備の 下部槽部は、浸漬管を取鍋内の溶鋼に浸漬して真空脱ガス処理を行なうと、溶鋼 が保有する高温、溶鋼の環流に伴う衝撃的な乱流による摩耗、あるいは繰返し使 用による急熱・急冷によって摩耗、スポーリングが発生且つ助長され、損傷する 。特に、取鍋内の溶鋼を下部槽内に吸上げる上昇管側の最上段煉瓦は溶鋼との比 重の差、および乱流しながら上昇する溶鋼の流動等によって、側壁煉瓦等で押え られていない槽底中心側は浮上し易く、最上段煉瓦と直下段煉瓦との間に目地開 きが生じ、上昇する溶鋼で洗われ（以下洗滌と言う）、加速度的に損傷が進行す る。また、最上段煉瓦の大型化を図ると、内外側の温度差によってスポーリング が発生し易くなると共に、規定の品質値を確保するためには煉瓦製造時加圧面積 に対応した大型プレスが必要となり、大型化にも自ずから限度があることから抜 本的な浮上防止対策が要望されている。 At the same time, as is well known, the vacuum degassing equipment, especially the lower tank part of the RH type vacuum degassing equipment, retains the molten steel when the immersion pipe is immersed in the molten steel in the ladle for vacuum degassing treatment. Wear and spalling are generated and promoted and damaged due to wear due to high temperature and shock turbulence accompanying recirculation of molten steel, or rapid heating and quenching due to repeated use. In particular, the uppermost brick on the side of the rising pipe that sucks the molten steel in the ladle into the lower tank is not pressed down by the side wall bricks due to the difference in specific gravity with the molten steel and the flow of the molten steel rising while turbulent. The center of the bottom of the tank easily floats up, and joints are opened between the uppermost bricks and the bricks directly below, washed with rising molten steel (hereinafter referred to as “washing”), and damage progresses at an accelerated rate. In addition, as the size of the topmost brick is increased, spalling is more likely to occur due to the temperature difference between the inside and outside, and a large press that corresponds to the pressing area during brick production is required to ensure the specified quality value. Therefore, since there is a limit to the size increase, drastic measures to prevent ascent are required.

【０００４】[0004]

【課題を解決するための手段】[Means for Solving the Problems]

本考案者等は、このような諸問題を解決するために種々検討、実験を行なった 結果、本考案上昇管の開発に成功したものであり、本考案の技術的構成は、前記 実用新案登録請求の範囲に明記したように、上昇管最上段の横迫り煉瓦と上昇管 外巻煉瓦との目地面に段差を設ける構造とすることによって、炉命の延長が図れ るように構成したものである。 The inventors of the present invention succeeded in developing the rising pipe of the present invention as a result of various studies and experiments to solve these problems, and the technical constitution of the present invention is the above-mentioned utility model registration. As specified in the claims, it is configured to extend the life of the reactor by providing a structure in which a step is provided on the joint between the uppermost horizontal riser brick and the outer riser brick. is there.

【０００５】[0005]

【作用】[Action]

本考案に於いては、上昇管最上段の横迫り煉瓦と上昇管外巻煉瓦との目地面に 段差を設けた構造としてあるので、溶鋼が保有する高温、溶鋼の環流に伴う衝撃 的な乱流による摩耗、あるいは繰返し使用による急熱、急冷によって摩耗、スポ ーリングが発生且つ助長されても損傷度合が少なく、特に上昇管最上段の横迫り 煉瓦背面部を垂直に煉瓦割りした従来構造とは異なり、側壁煉瓦等で押えられて いない槽底中心側の上昇管最上段煉瓦が乱流しながら上昇する溶鋼の流動等によ って浮上し、直下段煉瓦との間に目地開きが生じて上昇する溶鋼で洗滌され、損 傷速度が加速度的に進行するのを防止できるので、上昇管、ひいては下部槽全体 の炉命を大巾に延命させることが出来る。 In the present invention, since there is a step difference in the joint between the bricks on the uppermost side of the rising pipe and the bricks wound on the outside of the rising pipe, the high temperature of the molten steel and the shock disturbance due to the circulating flow of the molten steel. The degree of damage is small even if wear and sporing are generated and promoted by wear due to flow, rapid heat and quenching due to repeated use, and especially the conventional structure in which the back side of the upright side of the rising pipe is vertically divided into bricks. In contrast, the rising pipe on the center side of the tank bottom, which is not held down by the side wall bricks, floats due to the flow of molten steel that rises while the turbulent flow of the uppermost brick rises, and the joint rises with the bricks directly below it. It is possible to prevent the damage speed from progressing at an accelerated rate by being washed with molten steel, and it is possible to prolong the life of the ascending pipe, and thus of the entire lower tank.

【０００６】[0006]

【実施例】【Example】

以下、本考案を図１から図２に示す一実施例を参照しながら更に詳しく説明す る。尚、図１から図４に於いて共通する部分には同一符号を付してある。 Hereinafter, the present invention will be described in more detail with reference to an embodiment shown in FIGS. It should be noted that common portions in FIGS. 1 to 4 are denoted by the same reference numerals.

【０００７】 本考案に係る上昇管は、図１に本考案の第１実施例を適用した上昇管部の縦断 面図を示すように上昇管１の最上段煉瓦２とその外周部に配設する上昇管外巻煉 瓦３との目地面４部に段差５を設け構成されている。The riser pipe according to the present invention is arranged on the uppermost brick 2 of the riser pipe 1 and its outer peripheral portion as shown in FIG. 1 which is a vertical sectional view of the riser pipe portion to which the first embodiment of the present invention is applied. A step 5 is provided on the joint 4 with the rising pipe outer-winding brick 3.

【０００８】 こうした構造とすると、複数（通常２本）の浸漬管と環流管１とから成る一方 の管（上昇管）にアルゴンガスを吹込み脱ガス槽内を真空に保持すると、ガスポ ンプの原理で溶鋼を脱ガス槽内に吸上げ、他方の管（下降管）から取鍋に戻す一 連の脱ガス処理を行なった際、最上段煉瓦２が上昇管外巻煉瓦３で押えられてい るために上昇管内を乱流となって上昇する溶鋼によって押上げられ浮上すること がなく、最上段煉瓦２とその直下段煉瓦６との間に目地開きが生じ、溶鋼が浸入 洗滌して２面加熱となることにより生じるスポーリングの発生によって、主とし て最上段煉瓦２の損傷速度が加速度的に進行するのを防止することが出来、ひい ては下部槽全体の炉命を大巾に延命させることが出来る。With such a structure, when argon gas is blown into one of the tubes (upcombing tube) consisting of a plurality of (usually two) immersion tubes and the reflux tube 1, the inside of the degassing tank is kept vacuum, the gas pump In principle, when the molten steel was sucked up into the degassing tank and then the other pipe (downcomer pipe) was returned to the ladle, a series of degassing treatments were performed, in which the uppermost brick 2 was pressed by the outer pipe brick 3 wound up. Therefore, the molten steel that rises as a turbulent flow in the ascending pipe is not pushed up and floats up, and a joint opening is created between the uppermost brick 2 and the brick 6 immediately below it, and the molten steel infiltrates and cleans it. It is possible to prevent the damage speed of the uppermost brick 2 from accelerating mainly due to the occurrence of spalling caused by the surface heating, which in turn increases the life of the entire lower tank. You can prolong your life.

【０００９】 通常、下部槽の槽底部には、円周方向を複数個に分割した横迫り煉瓦を複数段 積重ねて円筒状に形成した環流管１（上昇管及び下降管）を２個配設し、その外 周部には敷煉瓦との取合せを良くするために円周方向を複数個に分割した環流管 外巻煉瓦３が配設してある。その際、上昇管の最上段煉瓦２と上昇管外巻煉瓦３ との目地面４に段差５を設ける。Usually, at the bottom of the lower tank, two reflux pipes 1 (upcomer pipe and downcomer pipe), each of which is formed in a cylindrical shape by stacking a plurality of horizontal bricks divided in the circumferential direction, are arranged. On the outer periphery of the brick, there is provided a recirculation pipe outer-wrap brick 3 which is divided into a plurality of pieces in the circumferential direction in order to improve the connection with the brick. At that time, a step 5 is provided on the joint surface 4 between the uppermost brick 2 of the rising pipe and the outer winding brick 3 of the rising pipe.

【００１０】 該段差５は、該最上段煉瓦２が浮上しその直下段煉瓦６との間に目地開きが生 じるのを防止するために設けるもので、上昇管外巻煉瓦３で押えられるように最 上段煉瓦２の下端部側面を凸状に形成し、対応する上昇管外巻煉瓦３面を凹状に 形成して設ける。そして、該段差５の位置は、最上段煉瓦２の上端部が損傷して 消失した場合その役目を果さなくなるため、最上段煉瓦２の下端側寄りに設け、 上昇管外巻煉瓦３で保持出来る寸法とすれば良い。The step 5 is provided to prevent the uppermost brick 2 from floating and opening a joint between the uppermost brick 2 and the brick 6 directly below the uppermost brick 2, and the step 5 is pressed by the outer pipe brick 3 wound up. As described above, the side surface of the lower end portion of the uppermost brick 2 is formed in a convex shape, and the corresponding surface of the outer pipe brick 3 wound outside is formed in a concave shape. Since the position of the step 5 does not serve its purpose when the upper end of the uppermost brick 2 is damaged and disappears, it is provided near the lower end of the uppermost brick 2 and is held by the rising pipe outer-wrapped brick 3. The size should be as large as possible.

【００１１】 次に本考案に係る上昇管１の第２実施例について説明する。図２は、段差５を ダボ状に形成した上昇管１の縦断面図である。Next, a second embodiment of the rising pipe 1 according to the present invention will be described. FIG. 2 is a vertical sectional view of the rising pipe 1 in which the step 5 is formed into a dowel shape.

【００１２】 第２実施例の上昇管１は、最上段煉瓦２とその外周部に配設する上昇管外巻煉 瓦３との間の目地面４に段差５をダボ状に設けてある。そして、最上段煉瓦２側 を凸状に形成し、上昇管外巻煉瓦３の相対する位置を凹状に形成することによっ て同様の効果を得ることが出来る。In the rising pipe 1 of the second embodiment, a step 5 is provided in a dowel shape on the joint surface 4 between the uppermost brick 2 and the rising pipe outer winding brick 3 arranged on the outer periphery thereof. The same effect can be obtained by forming the uppermost brick 2 side in a convex shape and forming the opposite position of the rising pipe outer winding brick 3 in a concave shape.

【００１３】 一方、上昇管外巻煉瓦３は、下部槽の温度変化により生じる熱応力によって亀 裂が発生し、亀裂発生部分からの浮上を招いたり、スポーリングが助長されるの を防止する目的で円周方向を複数個に分割した円筒状に形成して上昇管１と列設 した複数リングとし、その外周部と敷煉瓦との間に不定形耐火物を設けたものも ある。この場合は、上昇管外巻煉瓦３の外周部に設けた不定形耐火物層部が優先 的に損傷して上昇管外巻煉瓦３の拘束力が低下し、最上段煉瓦２と共に浮上する ことがあるため、上記第１〜２実施例と共に上昇管外巻煉瓦３の外周部にも凹状 の切欠け（７）を設け（これらの態様を：図１，図２に対応して図３，図４に示 す）該部に不定形耐火物を充填することによって更に効果を上げることができる 。On the other hand, the rising pipe outer-winding brick 3 is for the purpose of preventing cracks from being generated due to thermal stress caused by the temperature change in the lower tank, which invites floating from the cracked portion and promotes spalling. There is also a ring formed by dividing the circumferential direction into a plurality of cylinders and arranged in a row with the rising pipe 1 and providing an irregular refractory between the outer periphery and the brick. In this case, the irregular refractory layer provided on the outer periphery of the rising pipe outer brick 3 is preferentially damaged, and the restraint force of the rising pipe outer winding brick 3 is reduced, so that it floats up with the uppermost brick 2. Therefore, a concave notch (7) is also provided in the outer peripheral portion of the riser pipe outer winding brick 3 together with the above-mentioned first and second embodiments (these modes are shown in FIGS. The effect can be further enhanced by filling an amorphous refractory material in the portion (shown in FIG. 4).

【００１４】 本考案においては、第１〜２実施例で段差５、５を目地面４と直角に設けたが 、内外角にＲを付したり、曲線状を付したりすることが出来る。また、第２実施 例に於いて最上段煉瓦２側を凸状、上昇管外巻煉瓦３側を凹状に形成したが、凸 凹逆に形成することも出来る。In the present invention, the steps 5 and 5 are provided at right angles to the ground 4 in the first and second embodiments, but the inside and outside corners can be rounded or curved. In addition, in the second embodiment, the uppermost brick 2 side is formed in a convex shape and the rising pipe outer winding brick 3 side is formed in a concave shape, but it may be formed in an uneven shape.

【００１５】[0015]

【考案の効果】[Effect of the device]

以上説明したように本考案によれば、真空脱ガス設備に於ける上昇管において 、上昇管最上段煉瓦とその外周部に配設する上昇管外巻煉瓦との間の目地部に段 差を設けた構造としたので、従来の最上段煉瓦背面部を垂直に煉瓦割りした構造 とは異なり、乱流しながら管内を上昇する溶鋼によって最上段煉瓦が押上げられ 浮上することがなく、目地開きによって損傷速度が加速度的に進行するのを防止 することが出来、ひいては下部槽全体の炉命を大巾に延命させることが出来る。 As described above, according to the present invention, in the riser pipe in the vacuum degassing equipment, there is a step difference in the joint between the uppermost brick of the riser pipe and the riser pipe outer winding brick arranged on the outer periphery thereof. Since the structure is provided, unlike the conventional structure in which the back of the topmost brick is vertically divided into bricks, the topmost brick is not pushed up by the molten steel rising in the pipe with turbulent flow and does not float up. It is possible to prevent the damage rate from progressing at an accelerated rate, and it is possible to prolong the life of the entire lower tank.

【図面の簡単な説明】[Brief description of drawings]

【図１】本考案の１例を示す縦断面図。FIG. 1 is a vertical sectional view showing an example of the present invention.

【図２】本考案の他の例を示す縦断面図。FIG. 2 is a vertical sectional view showing another example of the present invention.

【図３】図１の例において外巻煉瓦の外周部に凹状の切
欠けを設けた縦断面図。FIG. 3 is a vertical cross-sectional view in which a concave cutout is provided on the outer peripheral portion of the outer-wrapping brick in the example of FIG.

【図４】図２の例において外巻煉瓦の外周部に凹状の切
欠けを設けた縦断面図。FIG. 4 is a vertical cross-sectional view in which a concave cutout is provided on the outer peripheral portion of the outer brick in the example of FIG.

【図５】従来構造の縦断面図。FIG. 5 is a vertical sectional view of a conventional structure.

【図６】従来構造の縦断面図。FIG. 6 is a vertical sectional view of a conventional structure.

【符号の説明】[Explanation of symbols]

１ 上昇管又は吸上管 ２ 最上段煉瓦 ３ 外巻煉瓦 ４ 目地面 ５、５ 段差 ６ 直下段煉瓦 ７ 切欠け 1 Ascending pipe or wicking pipe 2 Uppermost brick 3 Outer-rolled brick 4 Ground surface 5, 5 Step 6 Immediately lower brick 7 Notch

Claims (2)

【実用新案登録請求の範囲】[Scope of utility model registration request] 【請求項１】 真空脱ガス設備における上昇管におい
て、上昇管を構成する最上段煉瓦（２）とそれらの外周
に配設する外巻煉瓦（３）との間の目地部（４）に段差
（５）を設けた構造としたことを特徴とする、真空脱ガ
ス設備用上昇管。1. In a riser pipe in a vacuum degassing facility, a step is formed in a joint portion (4) between an uppermost brick (2) forming the riser pipe and an outer brick (3) arranged around them. An ascending pipe for a vacuum degassing facility, which has a structure provided with (5). 【請求項２】 前記段差が凹凸を有するダボ状構造
（５）である請求項１記載の真空脱ガス設備用上昇管。2. The rising pipe for vacuum degassing equipment according to claim 1, wherein the step is a dowel-shaped structure (5) having irregularities.