JP2005264263A - Immersion tube in rh degassing facility and method for cooling core metal of immersion tube - Google Patents
Immersion tube in rh degassing facility and method for cooling core metal of immersion tube Download PDFInfo
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- JP2005264263A JP2005264263A JP2004080763A JP2004080763A JP2005264263A JP 2005264263 A JP2005264263 A JP 2005264263A JP 2004080763 A JP2004080763 A JP 2004080763A JP 2004080763 A JP2004080763 A JP 2004080763A JP 2005264263 A JP2005264263 A JP 2005264263A
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- 239000002184 metal Substances 0.000 title claims abstract description 87
- 229910052751 metal Inorganic materials 0.000 title claims abstract description 87
- 238000001816 cooling Methods 0.000 title claims abstract description 62
- 238000007872 degassing Methods 0.000 title claims abstract description 32
- 238000007654 immersion Methods 0.000 title claims abstract description 10
- 238000000034 method Methods 0.000 title abstract description 12
- 238000010992 reflux Methods 0.000 claims description 75
- 239000012530 fluid Substances 0.000 claims description 10
- 230000001788 irregular Effects 0.000 claims 1
- 239000011823 monolithic refractory Substances 0.000 abstract 1
- 238000007664 blowing Methods 0.000 description 29
- 239000011449 brick Substances 0.000 description 18
- 229910000831 Steel Inorganic materials 0.000 description 10
- 239000010959 steel Substances 0.000 description 10
- 238000010586 diagram Methods 0.000 description 7
- 239000003507 refrigerant Substances 0.000 description 6
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 4
- 238000004088 simulation Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 238000007796 conventional method Methods 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- 238000007670 refining Methods 0.000 description 2
- 229910001209 Low-carbon steel Inorganic materials 0.000 description 1
- 239000000498 cooling water Substances 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
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Abstract
Description
本発明は、環流ガス配管によって芯金を冷却するRH脱ガス設備の浸漬管および浸漬管芯金冷却方法に関する。 The present invention relates to a dip tube of a RH degassing facility and a dip tube mandrel cooling method for cooling a mandrel by circulating gas piping.
吸上式真空精錬法として、真空槽内に鍋内の溶鋼を吸い上げて真空と接触させ、真空精錬を行うRH法がある。RH法では、2本の浸漬管のうち一方からArガスを吹き込みガスリフトポンプの原理で溶鋼を循環させている。
図7は、従来の浸漬管を説明する模式断面図である。図7に示すように、浸漬管は、内側の部分には煉瓦101が垂直方向に配設され、煉瓦を固定し外気からの空気の巻き込み防止のために煉瓦の背面に中子鉄皮とよばれる芯金102が配置され、芯金の外側に環流ガスを吹き込むための配管103が配設され、芯金および配管を覆うように、外側の部分に不定形耐火物104が設けられている。浸漬管の上部にはフランジ部105が設けられている。
As a suction type vacuum refining method, there is an RH method in which molten steel in a pan is sucked into a vacuum chamber and brought into contact with a vacuum to perform vacuum refining. In the RH method, Ar gas is blown from one of the two dip tubes, and the molten steel is circulated by the principle of a gas lift pump.
FIG. 7 is a schematic cross-sectional view illustrating a conventional dip tube. As shown in FIG. 7, the dip tube has a
溶鋼の脱ガス処理が行われると、浸漬管を溶鋼中に浸漬して溶鋼を真空槽内に吸引し、脱ガスや成分調整等が行われる。浸漬管は高温の溶鋼中に浸漬されるので、図8に示すように、熱膨張によって芯金102の下部が変形し、それに伴って配設した煉瓦101の間の目地部が広がり、または煉瓦に亀裂が入り、更には、煉瓦が脱落するという状態が生起する。
When the degassing treatment of the molten steel is performed, the dip tube is immersed in the molten steel, and the molten steel is sucked into the vacuum chamber to perform degassing and component adjustment. Since the dip tube is immersed in high-temperature molten steel, as shown in FIG. 8, the lower portion of the
従って、上述したような煉瓦の亀裂・脱落等を防止するために、浸漬管の芯金を冷却する各種の方法が提案されている。例えば、特開平10−17920号公報には、芯金を冷媒によって冷却する方法が開示されている。図9に示すように、この冷却方法によると、内管111bおよび外管111aの二重管からなる芯金111を煉瓦101と不定形耐火物104の間に配置し、芯金内に冷媒供給管113を設置し、冷媒供給管内に矢印の通り冷媒を送り込んで、芯金を冷却する。
Therefore, various methods for cooling the core metal of the dip tube have been proposed in order to prevent the above-described brick cracking / dropping off. For example, Japanese Patent Application Laid-Open No. 10-17920 discloses a method of cooling a metal core with a refrigerant. As shown in FIG. 9, according to this cooling method, a
即ち、芯金の冷却用に冷媒を循環させる専用の追加の冷却構造が設けられている。更に、特開平10−17920号公報には、芯金を冷媒によって冷却する別の方法が開示されている。即ち、図10に示すように、中実の金属板111(芯金)の周囲に冷却管116が螺旋状に巻きつけられて、例えば冷却水を冷却管内に循環させて冷却する別の冷却構造が開示されている。この例においても、芯金の冷却用に専用の追加の冷却構造が設けられている。
上述したように、従来の浸漬管においては、効果的に芯金を冷却するために、芯金冷却用の専用の追加の冷却構造が設けられている。上述したように専用の追加の冷却構造を用いる方法では、特別に冷却構造を付加するので、初期投資の増大や浸漬管価格の上昇が引き起こされるという問題点がある。 As described above, in the conventional dip tube, an additional cooling structure dedicated to cooling the core metal is provided in order to effectively cool the core metal. As described above, in the method using the dedicated additional cooling structure, the cooling structure is specially added, so that there is a problem in that the initial investment is increased and the dip tube price is increased.
従って、この発明の目的は、従来の問題点を解決して、芯金冷却用の専用の追加の冷却構造を設置することなく、低コストで効果的な芯金冷却装置を備えたRH脱ガス設備の浸漬管および浸漬管芯金冷却方法を提供することにある。 Accordingly, an object of the present invention is to solve the conventional problems and to provide an RH degassing equipped with an effective cored bar cooling device without installing an additional cooling structure dedicated to cooling the cored bar. An object of the present invention is to provide a dip tube for equipment and a method for cooling a dip tube core metal.
本発明者は、上述した従来技術の問題点を解決すべく鋭意研究を重ねた。その結果、浸漬管の内側に垂直方向に配設されている煉瓦の亀裂・脱落は、煉瓦の背面に配置されている芯金(鉄皮)の下部の変形に起因していること、および、芯金の変形は、溶鋼が真空槽内に上昇する時に主として発生していることが判明した。更に、浸漬管の損傷は、芯金の最下部付近の変形によることが判明した。従って、RH脱ガス設備の浸漬管の環流ガス配管を、芯金の下部、即ち、環流ガス吹き込み口より下側の部分の芯金の表面に沿って配設し、環流ガスをこのように配設された環流ガス配管に流すと、芯金冷却用の別個の専用の配管を設置することなく、芯金の冷却が効果的に行うことが可能で、浸漬管の損傷が防止でき、浸漬管の寿命が延びることが判明した。 The present inventor has intensively studied to solve the above-mentioned problems of the prior art. As a result, the crack / dropout of the brick arranged vertically inside the dip tube is due to the deformation of the lower part of the core metal (iron skin) arranged on the back of the brick, and It has been found that the deformation of the core metal mainly occurs when the molten steel rises into the vacuum chamber. Furthermore, it has been found that the dip tube damage is due to deformation near the bottom of the cored bar. Therefore, the reflux gas pipe of the dip pipe of the RH degassing equipment is arranged along the surface of the core metal at the lower part of the core metal, that is, the part below the reflux gas inlet, and the reflux gas is arranged in this way. When flowing through the installed reflux gas pipe, the core metal can be cooled effectively without installing a separate dedicated pipe for cooling the core metal, and the dip pipe can be prevented from being damaged. It has been found that the lifetime of
この発明は、上記研究結果に基づいてなされたものであって、この発明のRH脱ガス設備の浸漬管の第1の態様は、内側部に配設された耐火物と、前記耐火物の外側に配置された芯金と、前記芯金の一方の表面に配設された環流ガス配管と、そして、前記芯金および前記環流ガス配管を覆う不定形耐火物とを備えたRH脱ガス設備の浸漬管であって、少なくとも環流ガス吹き込み口より下側の芯金部分に前記環流ガス配管を配設して、配管内を流れる環流ガスによって、前記芯金の冷却を行うことを特徴とする、RH脱ガス設備の浸漬管である。 The present invention has been made on the basis of the above research results. The first aspect of the dip tube of the RH degassing equipment of the present invention includes a refractory disposed on the inner side and an outer side of the refractory. An RH degassing facility comprising: a metal core disposed on the surface of the metal core; a reflux gas pipe disposed on one surface of the metal core; and an amorphous refractory covering the metal core and the reflux gas pipe. It is a dip tube, wherein the reflux gas pipe is disposed at least on the core metal part below the reflux gas blowing port, and the core metal is cooled by the reflux gas flowing in the pipe. It is a dip tube for RH degassing equipment.
この発明のRH脱ガス設備の浸漬管の第2の態様は、前記芯金の高さ方向の下から30%以内の部分に、前記環流ガス配管を配設することを特徴とする、RH脱ガス設備の浸漬管である。 According to a second aspect of the dip pipe of the RH degassing equipment of the present invention, the reflux gas pipe is disposed in a portion within 30% from the bottom in the height direction of the cored bar. It is a dip tube for gas equipment.
この発明のRH脱ガス設備の浸漬管の第3の態様は、前記芯金の高さ方向の下から20%以内の部分に、前記環流ガス配管を配設することを特徴とする、RH脱ガス設備の浸漬管である。 According to a third aspect of the dip pipe of the RH degassing equipment of the present invention, the reflux gas pipe is disposed in a portion within 20% from the bottom in the height direction of the core metal. It is a dip tube for gas equipment.
この発明のRH脱ガス設備の浸漬管の第4の態様は、前記環流ガス配管の各々が少なくとも垂直部および水平部からなっており、前記水平部の一部が前記芯金部分に配設されている、RH脱ガス設備の浸漬管である。 According to a fourth aspect of the immersion pipe of the RH degassing facility of the present invention, each of the reflux gas pipes is composed of at least a vertical part and a horizontal part, and a part of the horizontal part is disposed in the cored bar part. It is a dip tube of RH degassing equipment.
この発明のRH脱ガス設備の浸漬管の第5の態様は、前記環流ガス配管の各々が少なくとも垂直部および水平部からなっており、前記水平部の全てが前記芯金部分に配設されている、RH脱ガス設備の浸漬管である。 According to a fifth aspect of the immersion pipe of the RH degassing facility of the present invention, each of the reflux gas pipes is composed of at least a vertical part and a horizontal part, and all of the horizontal part is disposed in the cored bar part. It is a dip tube of RH degassing equipment.
この発明のRH脱ガス設備の浸漬管の第6の態様は、前記環流ガス配管の各々が垂直部および水平部からなっている、RH脱ガス設備の浸漬管である。 A sixth aspect of the dip tube of the RH degassing equipment according to the present invention is a dip tube of the RH degassing equipment in which each of the reflux gas pipes is composed of a vertical portion and a horizontal portion.
この発明の浸漬管芯金冷却方法の第1の態様は、RH脱ガス設備の浸漬管の耐火物を保持する芯金の所定の部位に環流ガス配管を配設し、前記配管に環流ガスを流して前記芯金を冷却する、浸漬管芯金冷却方法である。 In the first aspect of the dip tube core metal cooling method of the present invention, a reflux gas pipe is disposed at a predetermined portion of the core metal that holds the refractory of the dip pipe of the RH degassing equipment, and the reflux gas is supplied to the pipe. It is a dip tube mandrel cooling method in which the mandrel is cooled by flowing.
この発明の浸漬管芯金冷却方法の第2の態様は、前記環流ガス配管を、少なくとも環流ガス吹き込み口より下側の芯金部分に配設する、浸漬管芯金冷却方法である。 A second aspect of the dip tube mandrel cooling method according to the present invention is a dip tube mandrel cooling method in which the reflux gas pipe is disposed at least in a mandrel portion below the reflux gas inlet.
この発明の浸漬管芯金冷却方法の第3の態様は、前記環流ガス配管を、前記芯金の高さ方向の下から30%以内の部分に配設する、浸漬管芯金冷却方法である。 A third aspect of the dip tube core metal cooling method according to the present invention is a dip tube core metal cooling method in which the reflux gas pipe is disposed in a portion within 30% from the bottom in the height direction of the core metal. .
この発明の浸漬管芯金冷却方法の第4の態様は、前記環流ガス配管を、前記芯金の高さ方向の下から20%以内の部分に配設する、浸漬管芯金冷却方法である。 A fourth aspect of the dip tube mandrel cooling method of the present invention is a dip tube mandrel cooling method in which the reflux gas pipe is disposed within a portion within 20% from the bottom in the height direction of the mandrel. .
この発明の耐火物保持用金物の冷却方法の第1の態様は、内部に耐火物保持用の金物を備えた、温環境において流体を吹き込む設備における前記金物の所定の部位の表面に流体を環流させる配管を配設し、前記配管に前記流体を流して、前記金物を冷却する、耐火物保持用金物の冷却方法である。 According to a first aspect of the method for cooling a refractory holding hardware according to the present invention, a fluid is circulated on a surface of a predetermined portion of the hardware in a facility for injecting a fluid in a warm environment having a refractory holding hardware inside. This is a cooling method for a refractory-holding hardware, in which a pipe is provided, and the fluid is allowed to flow through the pipe to cool the hardware.
上述したように、この発明によると、RH脱ガス設備の浸漬管の環流ガス配管を、芯金の下部、即ち、吹き込み口より下側の部分の芯金の表面に沿って配設し、環流ガスをこのように配設された配管に流すことによって、芯金冷却用の専用の冷却装置を付帯させることなく、芯金の熱変形を抑制することが可能な浸漬管およびその冷却方法を提供することができる。 As described above, according to the present invention, the reflux gas pipe of the dip pipe of the RH degassing equipment is arranged along the surface of the core metal at the lower part of the core metal, that is, the part below the blowing port. Provided is a dip tube capable of suppressing thermal deformation of a cored bar and a cooling method thereof without flowing a dedicated cooling device for cooling the cored bar by flowing the gas through the pipe arranged in this way can do.
この発明のRH脱ガス設備の浸漬管および浸漬管芯金冷却方法を、図面を参照しながら説明する。
この発明のRH脱ガス設備の浸漬管の1つの態様は、内側部に配設された耐火物と、耐火物の外側に配置された芯金と、芯金の一方の表面に配設された環流ガス配管と、そして、前記芯金および環流ガス配管を覆う不定形耐火物とを備えたRH脱ガス設備の浸漬管であって、少なくとも環流ガス吹き込み口より下側の部分に前記環流ガス配管を配設して、配管内を流れる環流ガスによって、前記芯金の冷却を行うことを特徴とする、RH脱ガス設備の浸漬管である。
The dip tube and the dip tube core metal cooling method of the RH degassing equipment of the present invention will be described with reference to the drawings.
One aspect of the dip tube of the RH degassing equipment of the present invention is a refractory disposed on the inner side, a core disposed outside the refractory, and disposed on one surface of the core. A RH degassing equipment dip pipe comprising a reflux gas pipe and an amorphous refractory covering the core metal and the reflux gas pipe, at least in the portion below the reflux gas inlet And the core metal is cooled by the circulating gas flowing in the pipe.
図1から図3は、この発明の浸漬管を説明する図である。図1から図3は、浸漬管を展開した図である。即ち、浸漬管を所定の部位で中心軸線に沿って切断し、横方向に広げ、平面上に展開した図である。図の上側が浸漬管の上部側、図の下側が浸漬管の下部側を示す。なお、芯金の冷却の説明を容易にするために、芯金、環流ガス配管、環流ガス吹き込み口を示し、芯金を覆う不定形耐火物は省略している。図1は、芯金および環流ガス吹き込み口の相対的位置を示す図である。図1に示すように、芯金1の上端部にはフランジ部2が設けられ、芯金の高さ方向の概ね中央部に複数の環流ガス吹き込み口3が配置されている。芯金の下部には複数の煉瓦支持ピン4が配置され、更にその下端部には丸鋼5等が巻きつけられる。なお、本発明においては煉瓦保持方式としては支持ピンに限られるものではなく、リブタイプ等にも適用することができる。
1 to 3 are views for explaining a dip tube according to the present invention. 1 to 3 are developed views of the dip tube. That is, it is a view in which the dip tube is cut along a central axis at a predetermined portion, spread in the lateral direction, and developed on a plane. The upper side of the figure shows the upper side of the dip tube, and the lower side of the figure shows the lower side of the dip tube. In order to facilitate the explanation of the cooling of the metal core, the metal core, the circulating gas pipe, and the circulating gas blowing port are shown, and the amorphous refractory covering the metal core is omitted. FIG. 1 is a diagram showing the relative positions of the cored bar and the reflux gas blowing port. As shown in FIG. 1, a
図4は、従来の環流ガス配管を示す図である。図4に示すように、従来は、芯金21の高さ方向の概ね中央部に配置された複数の環流ガス吹き込み口23のそれぞれに向かって概ね最短距離を通って環流ガス吹き込み管26が配置されていた。従って、芯金21の高さ方向の概ね中央部に配置された複数の環流ガス吹き込み口23の下方には環流ガス吹き込み管26は配置されていなかった。
FIG. 4 is a diagram showing a conventional reflux gas pipe. As shown in FIG. 4, conventionally, the reflux
この発明の浸漬管においては、少なくとも環流ガス吹き込み口より下側の芯金部分に沿って環流ガス配管が配設されているので、配管内を流れる環流ガスによって、従来熱膨張で変形していた芯金の下部の部分が効果的に冷却される。 In the dip tube of the present invention, since the reflux gas pipe is disposed at least along the cored bar portion below the reflux gas blow-in port, it has been deformed by the conventional thermal expansion by the reflux gas flowing in the pipe. The lower part of the mandrel is effectively cooled.
図2は、芯金の表面上に配置された環流ガス吹き込み管の1つの配管状態を示す図である。図2に示すように、環流ガス吹き込み管6はそれぞれ垂直部と水平部からなっており、環流ガス吹き込み口3の下方、即ち、芯金の高さ方向の下部に殆どの環流ガス吹き込み管6が配設されている。図2に示す例では、芯金の下部の煉瓦支持ピンの位置の直上部分に多数の環流吹き込み管が配置されている。
FIG. 2 is a view showing one piping state of the circulating gas blowing pipe arranged on the surface of the cored bar. As shown in FIG. 2, each of the reflux
この例では、煉瓦支持ピンの下部には、環流吹き込み管が配置されていない。この態様の環流ガス吹き込み管の配置によると、芯金専用の特別な追加の冷却構造を新たに設けることなく、既設の環流ガス吹き込み管を芯金の下部まで配設しているので、配管に環流ガスを吹き込むだけで、付帯的に、芯金の下端部付近を効果的に冷却し、芯金の下端部の熱による変形を防止することができる。 In this example, no recirculation blow pipe is disposed below the brick support pins. According to the arrangement of the reflux gas blowing pipe of this aspect, the existing reflux gas blowing pipe is arranged to the lower part of the core metal without newly providing a special additional cooling structure dedicated to the core metal. By simply blowing the reflux gas, incidentally, the vicinity of the lower end portion of the core metal can be effectively cooled, and deformation of the lower end portion of the core metal due to heat can be prevented.
図3は、芯金の表面上に配置された環流ガス吹き込み管の他の1つの配管状態を示す図である。図3に示すように、環流ガス吹き込み管6はそれぞれ垂直部と水平部からなっており、環流ガス吹き込み口3の下方、即ち、芯金の高さ方向の下部に多数の環流ガス吹き込み管が芯金の表面に沿って配設されている。図3に示す例では、芯金の下部の煉瓦支持ピン4と丸鋼5の間にも一部の環流吹込み管の水平部が配置されている。なお、煉瓦支持ピン4に密接して全周環流吹き込み管の水平部を配置することが望ましく冷却効果が大きくなる。
FIG. 3 is a view showing another piping state of the circulating gas blowing pipe arranged on the surface of the cored bar. As shown in FIG. 3, each of the reflux
この態様によると、芯金の下端部も効果的に冷却されることができる。この発明によると、芯金専用の特別な追加の冷却構造を新たに設けることなく、既設の環流ガス吹き込み管を芯金の下端部まで配設しているので、配管に環流ガスを吹き込むだけで、付帯的に、芯金の下端部付近を効果的に冷却し、芯金の下端部の熱による変形を防止することができる。 According to this aspect, the lower end portion of the core metal can also be effectively cooled. According to the present invention, since the existing reflux gas blowing pipe is disposed up to the lower end of the core metal without newly providing a special additional cooling structure dedicated to the core metal, only the reflux gas is blown into the pipe. In addition, it is possible to effectively cool the vicinity of the lower end portion of the core metal and prevent the lower end portion of the core metal from being deformed by heat.
この発明の浸漬管芯金冷却方法において、環流ガス配管を、芯金の高さ方向の下から30%以内の部分に配設するのが好ましい。更に、環流ガス配管を、芯金の高さ方向の下から20%以内の部分に配設するのがより好ましい。更に、環流ガス配管を、芯金の高さ方向の下から15%以内の部分に配設するのが更に好ましい。 In the dip tube mandrel cooling method of the present invention, it is preferable that the reflux gas pipe is disposed in a portion within 30% from the bottom in the height direction of the mandrel. Furthermore, it is more preferable to arrange the reflux gas pipe in a portion within 20% from the bottom in the height direction of the cored bar. Furthermore, it is more preferable to arrange the reflux gas pipe in a portion within 15% from the bottom in the height direction of the cored bar.
本発明の浸漬管の冷却効果を先ずシュミレーションによって検証し、次いで実際にその効果を検証した。先ず、シュミレーションにおいて、極低炭素鋼の4CC連続処理を想定し、下記条件によって芯金の温度変化を推定した。即ち、
溶鋼温度:1650℃
Arガス流量:3000Nl/分
浸漬パターン:浸漬30分+待機10分×4サイクル
The cooling effect of the dip tube of the present invention was first verified by simulation, and then the effect was actually verified. First, in the simulation, assuming the 4CC continuous treatment of ultra-low carbon steel, the temperature change of the core metal was estimated under the following conditions. That is,
Molten steel temperature: 1650 ° C
Ar gas flow rate: 3000 Nl / min immersion pattern:
図5に4サイクル後の温度分布を示す。(1)は従来の浸漬管、(2)は本発明の浸漬管を示す。図5に示すように、従来の浸漬管では、1000℃を超える高温域がかなり上の部分まで存在している。これに対して、本発明の浸漬管では、1000℃を超える高温域が下の一部に存在している。芯金の熱膨張による変形が防止できる900℃未満の温度域が、本発明では芯金の下端部に伸びているのに対して、従来では、900℃未満の温度域が芯金の下端からかなり上の部分で止まっている。即ち、従来の浸漬管では芯金の下端部の広い部分が温度が1000℃を超えて、芯金の熱膨張による変形が起きるのに対して、この発明の浸漬管では芯金の下端部の温度は900℃未満で、芯金の熱膨張による変形が防止できることがわかる。従って、シュミレーションによると、芯金は下端部においても効果的に冷却され、熱膨張による変形が起きないという結果が得られた。 FIG. 5 shows the temperature distribution after 4 cycles. (1) shows a conventional dip tube, and (2) shows a dip tube of the present invention. As shown in FIG. 5, in the conventional dip tube, the high temperature region exceeding 1000 ° C. exists up to the upper part. On the other hand, in the dip tube of the present invention, a high temperature region exceeding 1000 ° C. exists in the lower part. In the present invention, the temperature range below 900 ° C. at which deformation due to thermal expansion of the core metal can be prevented extends to the lower end of the core metal, whereas conventionally, the temperature range below 900 ° C. extends from the lower end of the core metal. It stops at the upper part. That is, in the conventional dip tube, the temperature of the wide portion of the lower end portion of the core metal exceeds 1000 ° C. and deformation due to thermal expansion of the core metal occurs, whereas in the dip tube of the present invention, the lower end portion of the core metal is It can be seen that the temperature is less than 900 ° C. and deformation due to thermal expansion of the cored bar can be prevented. Therefore, according to the simulation, the core metal was effectively cooled also at the lower end portion, and the result that deformation due to thermal expansion did not occur was obtained.
図6は、計算温度と変形量を示す。図中、○および△は、芯金の温度を示し、AおよびBは芯金の変形を示す。○およびAはそれぞれ本発明の例であり、△およびBはそれぞれ従来の例を示す。図6から明らかなように、本発明の例では、芯金の温は概ね800℃以下であり、そして、芯金の内径の拡大は殆どみられなかった。これに対して、従来例では、芯金の温度は1000℃を超え、下端部において芯金の内径が大きく拡大している。 FIG. 6 shows the calculated temperature and the deformation amount. In the figure, ◯ and Δ indicate the temperature of the core metal, and A and B indicate deformation of the core metal. ○ and A are examples of the present invention, and Δ and B are conventional examples. As is apparent from FIG. 6, in the example of the present invention, the temperature of the cored bar was approximately 800 ° C. or less, and the inner diameter of the cored bar was hardly increased. On the other hand, in the conventional example, the temperature of the cored bar exceeds 1000 ° C., and the inner diameter of the cored bar is greatly expanded at the lower end.
次いで、実際に使用して検証した。実際に使用したところ、芯金下端部の温度は、シュミレーションと概ね同一結果が得られた。即ち、芯金の上部、中段、最下部の温度は、従来の方法では、それぞれ、368℃、648℃、1200℃であったのに対して、本発明の方法では、それぞれ、383℃、375℃、583℃であった。その結果、本発明においては、芯金の内径の拡大は殆どみられなかった。
なお、芯金の冷却を環流ガス配管によって行う場合の、環流ガス吹き込み口の数の検討を行った。従来は環流ガス吹き込み口は、24から30であるが、吹き込み口の数が減少しても流量変化は断面積に比例して減少しないことが判明した。従って、環流ガス吹き込み口は、12から16で所望の流量が得られることがわかった。これによって、更なるコストの低下が可能になる。
Then, it was actually used and verified. When actually used, the temperature at the lower end of the cored bar was almost the same as in the simulation. That is, the temperatures of the upper, middle, and lowermost portions of the core metal were 368 ° C., 648 ° C., and 1200 ° C. in the conventional method, respectively, whereas in the method of the present invention, they were 383 ° C. and 375 ° C., respectively. And 583 ° C. As a result, in the present invention, the expansion of the inner diameter of the core metal was hardly observed.
Note that the number of reflux gas inlets when the core metal was cooled by the reflux gas piping was examined. Conventionally, the number of reflux gas inlets is 24 to 30, but it has been found that the change in flow rate does not decrease in proportion to the cross-sectional area even if the number of inlets decreases. Therefore, it was found that the desired flow rate was obtained when the reflux gas inlet was 12 to 16. As a result, the cost can be further reduced.
上述したように、この発明の既設の環流ガス配管の配置状況を工夫することによって、特別な冷却構造を備えることなく、芯金を冷却することができる。なお、この発明によると、浸漬管だけに限らず、耐火物保持用金物の冷却を行うことも可能である。
即ち、内部に耐火物保持用の金物を備えた、温環境において流体を吹き込む設備における前記金物の所定の部位の表面に流体を環流させる配管を配設し、前記配管に前記流体を流して、前記金物を冷却する、耐火物保持用金物の冷却方法である。流体を環流させる配管を工夫することによって、本来の目的の他に対象物を効果的に冷却することができる。
As described above, the metal core can be cooled without providing a special cooling structure by devising the arrangement state of the existing reflux gas piping of the present invention. In addition, according to this invention, it is also possible to cool not only the dip tube but also the refractory holding hardware.
That is, a pipe for circulating a fluid on the surface of a predetermined part of the hardware in a facility for blowing a fluid in a warm environment, provided with a metal for holding a refractory inside, and flowing the fluid through the pipe, It is a cooling method of a refractory-holding hardware for cooling the hardware. By devising the piping for circulating the fluid, the object can be effectively cooled in addition to the original purpose.
この発明によると、RH脱ガス設備の浸漬管の環流ガス配管を、芯金の下部、即ち、吹き込み口より下側の部分の芯金の表面に配設し、環流ガスを配管に流すことによって、特別な冷却装置を付帯させることなく、芯金の熱変形を抑制することが可能な浸漬管およびその冷却方法を提供することができ、産業上利用価値が高い。 According to the present invention, the reflux gas pipe of the dip pipe of the RH degassing equipment is arranged on the lower surface of the core metal, that is, on the surface of the core metal below the blowing port, and the reflux gas is caused to flow through the pipe Further, it is possible to provide a dip tube capable of suppressing the thermal deformation of the cored bar without attaching a special cooling device and a cooling method therefor, and the industrial utility value is high.
1.芯金
2.フランジ
3.ガス吹き込み口
4.煉瓦支持ピン
5.丸鋼
6.環流ガス吹き込み管
26.従来の環流ガス吹き込み管
101.煉瓦
102.芯金
103.環流ガス吹き込み管
104.不定形耐火物
105.フランジ
1.
Claims (11)
A pipe provided with a metal for holding a refractory inside and for circulating a fluid on the surface of a predetermined part of the metal in a facility for injecting a fluid in a warm environment, and flowing the fluid through the pipe, the metal Cooling method for cooling refractory holding hardware.
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Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2010159461A (en) * | 2009-01-08 | 2010-07-22 | Kurosaki Harima Corp | Immersion tube |
WO2012154714A1 (en) * | 2011-05-11 | 2012-11-15 | Tyk America, Inc. | Degasser snorkel with serpentine flow path cooling |
JP2013076141A (en) * | 2011-09-30 | 2013-04-25 | Kurosaki Harima Corp | Immersion tube for vacuum degassing for molten steel |
CN117782471A (en) * | 2024-02-27 | 2024-03-29 | 中国重型机械研究院股份公司 | Device and method for detecting conduction capacity of argon blowing pipeline of RH vacuum tank dip pipe |
-
2004
- 2004-03-19 JP JP2004080763A patent/JP4805546B2/en not_active Expired - Lifetime
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2010159461A (en) * | 2009-01-08 | 2010-07-22 | Kurosaki Harima Corp | Immersion tube |
WO2012154714A1 (en) * | 2011-05-11 | 2012-11-15 | Tyk America, Inc. | Degasser snorkel with serpentine flow path cooling |
JP2013076141A (en) * | 2011-09-30 | 2013-04-25 | Kurosaki Harima Corp | Immersion tube for vacuum degassing for molten steel |
CN117782471A (en) * | 2024-02-27 | 2024-03-29 | 中国重型机械研究院股份公司 | Device and method for detecting conduction capacity of argon blowing pipeline of RH vacuum tank dip pipe |
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