JP6518138B2 - Lance pipe for smelting treatment of molten metal - Google Patents
Lance pipe for smelting treatment of molten metal Download PDFInfo
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- JP6518138B2 JP6518138B2 JP2015119586A JP2015119586A JP6518138B2 JP 6518138 B2 JP6518138 B2 JP 6518138B2 JP 2015119586 A JP2015119586 A JP 2015119586A JP 2015119586 A JP2015119586 A JP 2015119586A JP 6518138 B2 JP6518138 B2 JP 6518138B2
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- 239000002184 metal Substances 0.000 title claims description 63
- 238000003723 Smelting Methods 0.000 title description 3
- 230000005855 radiation Effects 0.000 claims description 52
- 230000002093 peripheral effect Effects 0.000 claims description 36
- 230000001629 suppression Effects 0.000 claims description 33
- 238000007670 refining Methods 0.000 claims description 18
- 239000003795 chemical substances by application Substances 0.000 claims description 7
- 238000009700 powder processing Methods 0.000 claims 1
- 238000000034 method Methods 0.000 description 14
- 238000004088 simulation Methods 0.000 description 12
- 239000007789 gas Substances 0.000 description 11
- 239000011810 insulating material Substances 0.000 description 10
- 230000000052 comparative effect Effects 0.000 description 9
- 229910000831 Steel Inorganic materials 0.000 description 7
- 239000010959 steel Substances 0.000 description 7
- 238000010438 heat treatment Methods 0.000 description 4
- 238000009413 insulation Methods 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 239000000919 ceramic Substances 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 239000000835 fiber Substances 0.000 description 3
- 238000007664 blowing Methods 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000000843 powder Substances 0.000 description 2
- 238000002203 pretreatment Methods 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 239000000112 cooling gas Substances 0.000 description 1
- 239000011888 foil Substances 0.000 description 1
- 238000007654 immersion Methods 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 239000012774 insulation material Substances 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 238000009628 steelmaking Methods 0.000 description 1
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- Treatment Of Steel In Its Molten State (AREA)
- Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)
- Furnace Charging Or Discharging (AREA)
Description
本発明は、溶銑、溶鋼等の溶融金属に、その精錬処理のためにガスや処理剤を供給するランスパイプに関する。 The present invention relates to a lance pipe for supplying a gas and a treatment agent to a molten metal such as hot metal and molten steel for its refining process.
製鉄分野においては、鋼材に対する品質要求の高度化に伴って、溶融金属を精錬する精錬処理が実施されている。具体的には、精錬処理として、溶銑予備処理及び２次精錬処理が実施されている。溶銑予備処理とは、転炉に装入する溶銑から、あらかじめ不純物を除く処理のことをいい、２次精錬処理とは、転炉から出鋼した溶鋼を最終的に精錬、脱ガスする処理のことをいう（以下、本明細書では、溶銑予備処理及び２次精錬処理を総称して精錬処理という。）。 In the steel making field, with the sophistication of quality requirements for steel products, a refining process for refining molten metal is being carried out. Specifically, hot metal pretreatment and secondary refining are carried out as the refining process. The hot metal pre-treatment means the treatment to remove impurities from the hot metal charged into the converter in advance, and the secondary refining process is the processing to finally refine and degas the molten steel extracted from the converter. (Hereinafter, hot metal pre-treatment and secondary smelting treatment are generically referred to as smelting treatment in the present specification.)
精錬処理においては、溶融金属内にランスパイプを挿入し、ランスパイプの吐出孔から溶融金属内にガスや処理剤を吹き込む処理が一般的に実施される。これらのガスや処理剤は、ランスパイプの芯金パイプにより搬送されるが、このとき芯金パイプは溶融金属からの伝熱により加熱され、芯金パイプの温度が上昇する。その結果、芯金パイプの強度が低下し、ランスパイプの先端部分が脱落するなどの不具合が生じることがあった。 In the refining process, a lance pipe is inserted into the molten metal, and a process of blowing a gas or a treating agent into the molten metal from the discharge hole of the lance pipe is generally performed. These gases and processing agents are transported by the core pipe of the lance pipe, but at this time, the core pipe is heated by heat transfer from the molten metal, and the temperature of the core pipe rises. As a result, the strength of the cored pipe may be reduced, and a failure such as the tip end of the lance pipe may be caused.
芯金パイプの温度上昇を抑制するための技術として、特許文献１には、芯金パイプの外側に断熱材層を設ける技術が開示されている。 As a technique for suppressing the temperature rise of the cored metal pipe, Patent Document 1 discloses a technology in which a heat insulating material layer is provided outside the cored metal pipe.
また、特許文献２には、芯金パイプを二重管構造とし、その外管から冷却用気体を吹き出すことにより、芯金パイプを被覆する被覆耐火物の表面を冷却し、その被覆耐火物の溶損を抑制する技術が開示されている。 Further, in Patent Document 2, the cored metal pipe has a double pipe structure, and the surface of the coated refractory that covers the cored metal pipe is cooled by blowing a cooling gas from the outer pipe, and the coated refractory is There is disclosed a technique for suppressing the melting loss.
特許文献１の技術は、芯金パイプの外側に断熱材層を設けることで芯金パイプの温度上昇を抑制しようとするものであるが、実際のランスパイプにおいては、被覆耐火物を芯金パイプに確実に固定するために芯金パイプの外周面には金属製のスタッドが多数設けられており、これらスタッドを介した熱伝達（熱流入）が避けられない。すなわち、芯金パイプの外側に断熱材層を設けるだけでは、スタッドを介した熱伝達を抑えることができず、芯金パイプの温度上昇を抑制するには不十分である。スタッドを介した熱伝達を抑えるには、スタッドの外側に断熱材層を設けることが考えられるが、スタッドは多数あり、その形状も複雑であるので、スタッドの外側に断熱材層を設けることは、現実的には困難である。 The technique of Patent Document 1 attempts to suppress the temperature rise of the cored metal pipe by providing a heat insulating material layer on the outside of the cored metal pipe, but in the actual lance pipe, the coated refractory is used as the cored metal pipe In order to ensure fixation to the metal core pipe, a large number of metal studs are provided on the outer peripheral surface of the metal core pipe, and heat transfer (heat inflow) through these studs can not be avoided. That is, the heat transfer through the studs can not be suppressed only by providing the heat insulating material layer on the outside of the cored pipe, which is insufficient to suppress the temperature rise of the cored pipe. In order to suppress heat transfer through the stud, it is conceivable to provide a heat insulating material layer on the outside of the stud, but since there are many studs and their shapes are complicated, it is possible to provide a heat insulating material layer on the outside of the stud , Realistically difficult.
また、特許文献１の技術では、芯金パイプの外側に断熱材層に加えて、熱膨張の小さい耐熱性管体として例えば紙管を設けているが、この紙管は被覆耐火物と芯金パイプの熱膨張差により芯金パイプが被覆耐火物に対し縦方向にずれることを許容するために設けられたもので、ランスパイプの断面係数の向上には殆んど寄与しない。したがって、特許文献１の技術ではランスパイプの断面係数が十分ではなく、結果としてランスパイプが曲がってしまい、耐用性が低下するという問題がある。 Further, in the technology of Patent Document 1, in addition to the heat insulating material layer outside the cored metal pipe, for example, a paper pipe is provided as a heat-resistant tubular body having a small thermal expansion. It is provided to allow the cored metal pipe to shift longitudinally with respect to the coated refractory due to the thermal expansion difference of the pipe, and it hardly contributes to the improvement of the section coefficient of the lance pipe. Therefore, in the technique of Patent Document 1, the cross-sectional coefficient of the lance pipe is not sufficient, and as a result, the lance pipe is bent and there is a problem that the durability is lowered.
この点、特許文献２の技術では芯金パイプを二重管構造としているので、ランスパイプの断面係数は向上する。また、外管に冷却用気体を通過させるなど、冷却のための工夫がなされているが、高温になった外管と内管における支配的な伝熱形態である輻射熱を抑制することができないため、芯金パイプ（内管）の温度上昇を抑制するには不十分である。 In this respect, in the technique of Patent Document 2, since the cored metal pipe has a double pipe structure, the section coefficient of the lance pipe is improved. Moreover, although the device for cooling is made, such as letting the gas for cooling pass to an outer pipe, since the radiant heat which is the dominant heat transfer form in the outer pipe and the inner pipe which became high temperature can not be suppressed. , It is insufficient to suppress the temperature rise of the core metal pipe (inner pipe).
そこで、本発明が解決しようとする課題は、ランスパイプとしての十分な断面係数を確保するとともに、芯金パイプ（内管）の温度上昇を抑制し、もってランスパイプの耐用性を向上させることにある。 Therefore, the problem to be solved by the present invention is to secure a sufficient section coefficient as the lance pipe and to suppress the temperature rise of the core metal pipe (inner pipe), thereby to improve the durability of the lance pipe. is there.
本発明によれば、次の溶融金属の精錬処理用のランスパイプが提供される。
（１）ガス又はガスとともに溶融金属の精錬処理のための粉体処理剤を搬送する搬送通路である内管と、この内管の外側に配置した外管とを備えた溶融金属の精錬処理用のランスパイプであって、
前記内管の外周面と前記外管の内周面との間に、輻射伝熱抑制層及び空気層を設けたことを特徴とする溶融金属の精錬処理用のランスパイプ。
（２）前記輻射伝熱抑制層は前記内管の外周面に沿って設け、この輻射伝熱抑制層の外側に前記空気層を設けた、（１）に記載の溶融金属の精錬処理用のランスパイプ。
According to the present invention, the following lance pipe for refining processing of molten metal is provided.
(1) for refining process of molten metal with an inner tube is a conveyance path for conveying the powder treatment agent, and an outer tube arranged outside of the inner tube for refining process of the molten metal with a gas or gas The lance pipe of
A lance pipe for refining molten metal characterized in that a radiation heat transfer suppressing layer and an air layer are provided between the outer peripheral surface of the inner pipe and the inner peripheral surface of the outer pipe.
(2) The radiation heat transfer suppression layer is provided along the outer peripheral surface of the inner pipe, and the air layer is provided outside the radiation heat transfer suppression layer, for refining treatment of molten metal according to (1) Lance pipe.
本発明によれば、芯金パイプを内管と外管との二重管構造としたことで、ランスパイプとしての十分な断面係数を確保することができる。また、内管と外管との間に輻射伝熱抑制層及び空気層を設けたことで、外管から内管への熱伝達を抑えることができ、芯金パイプ（内管）の温度上昇を抑制することができる。これにより、ランスパイプの耐用性を向上させることができる。 According to the present invention, since the cored bar pipe has a double pipe structure of the inner pipe and the outer pipe, it is possible to secure a sufficient sectional coefficient as a lance pipe. Moreover, the heat transfer from the outer pipe to the inner pipe can be suppressed by providing the radiant heat transfer suppression layer and the air layer between the inner pipe and the outer pipe, and the temperature rise of the cored pipe (inner pipe) Can be suppressed. Thereby, the durability of the lance pipe can be improved.
また、本発明によれば、芯金パイプを被覆耐火物中で確実に固定するために芯金パイプ（外管）の外周面に金属製のスタッドを設けたとしても、そのスタッドの外側には断熱材層を設ける必要はない。すなわち、スタッドを介して外管に熱伝達があったとしても、外管と内管との間には前述のとおり空気層及び輻射伝熱抑制層があるから、外管から内管への熱伝達は抑えられる。このように本発明によれば、スタッドを使用する条件下においても、内管と外管との間に輻射伝熱抑制層及び空気層を設けるという簡単な構成で、芯金パイプ（内管）の温度上昇を抑制することができる。 Further, according to the present invention, even if metal studs are provided on the outer peripheral surface of the cored metal pipe (outer pipe) in order to securely fix the cored metal pipe in the coated refractory, the studs are provided outside There is no need to provide a thermal insulation layer. That is, even if heat is transferred to the outer pipe through the studs, the air layer and the radiation heat transfer suppressing layer are present between the outer pipe and the inner pipe as described above, so the heat from the outer pipe to the inner pipe is Transmission is suppressed. As described above, according to the present invention, the cored pipe (inner pipe) has a simple configuration in which the radiation heat transfer suppressing layer and the air layer are provided between the inner pipe and the outer pipe even under the condition of using the stud. Temperature rise can be suppressed.
さらに、本発明によれば、外管と内管との間に輻射伝熱抑制層のほかに空気層を設けるから、輻射伝熱抑制層を設けるときの施工性が向上する。例えば内管の外周面に輻射伝熱抑制層を設けてこの内管を外管内に挿入する施工の場合、この輻射伝熱抑制層の外側に空気層を設けるための隙間が存在するから、内管を外管内に挿入しやすい。また、外管の内周面に輻射伝熱抑制層を設けてこの外管内に内管を挿入する施工の場合は、輻射伝熱抑制層の内側に空気層を設けるための隙間が存在するから、外管内に内管を挿入しやすい。 Furthermore, according to the present invention, since an air layer is provided between the outer pipe and the inner pipe in addition to the radiation heat transfer suppression layer, the workability when providing the radiation heat transfer suppression layer is improved. For example, in the case of providing a radiant heat transfer suppression layer on the outer peripheral surface of the inner pipe and inserting the inner pipe into the outer pipe, there is a gap for providing an air layer outside the radiant heat transfer suppression layer. Easy to insert the tube into the outer tube. Further, in the case of providing the radiation heat transfer suppressing layer on the inner circumferential surface of the outer tube and inserting the inner tube in the outer tube, there is a gap for providing an air layer inside the radiation heat transfer suppressing layer. , Easy to insert the inner tube into the outer tube.
図１は、本発明の一実施形態に係るランスパイプを示し、（ａ）はその概念的な断面図、（ｂ）はその芯金パイプの拡大端面図である。 FIG. 1 shows a lance pipe according to an embodiment of the present invention, where (a) is a conceptual cross-sectional view thereof and (b) is an enlarged end view of a cored pipe.
図１に示すランスパイプ１０の芯金パイプ１１は、内管１２と外管１３との二重管構造を有する。内管１２は、ガス又はガスとともに処理剤（粉体）を搬送する搬送通路であり、この内管１２の外側に外管１３を配置することで、二重管構造となっている。本実施形態では、外管１３の上端及び下端をそれぞれ内管１２に固定することで、内管１１及び外管１２を一体としており、さらに、その下端には内管１２に通じる吹込管１４が接続されている。 The cored pipe 11 of the lance pipe 10 shown in FIG. 1 has a double pipe structure of an inner pipe 12 and an outer pipe 13. The inner tube 12 is a transfer passage for transferring the treatment agent (powder) together with the gas or gas, and the outer tube 13 is disposed outside the inner tube 12 to form a double tube structure. In the present embodiment, the upper end and the lower end of the outer pipe 13 are fixed to the inner pipe 12, respectively, so that the inner pipe 11 and the outer pipe 12 are integrated, and the blow pipe 14 connected to the inner pipe 12 is connected to the lower end. It is connected.
内管１２の外周面と外管１３の内周面との間には、輻射伝熱抑制層１５及び空気層１６が設けられている。本実施形態では、内管１２の外周面に沿って輻射伝熱抑制層１５を設け、この輻射伝熱抑制層１５の外側に空気層１６を設けている。 A radiation heat transfer suppressing layer 15 and an air layer 16 are provided between the outer peripheral surface of the inner pipe 12 and the inner peripheral surface of the outer pipe 13. In the present embodiment, the radiation heat transfer suppression layer 15 is provided along the outer peripheral surface of the inner pipe 12, and the air layer 16 is provided outside the radiation heat transfer suppression layer 15.
ここで、輻射伝熱抑制層としては、セラミックファイバー等の断熱材、金属箔等の低放射率材が挙げられる。セラミックファイバー等の断熱材は輻射熱を遮断する機能を有し、低放射率材は輻射伝熱を直接抑制する機能を有する。輻射伝熱抑制層はこれら機能の少なくとも１つの機能を有する。 Here, as a radiation heat transfer suppression layer, low emissivity materials, such as heat insulation materials, such as a ceramic fiber, and metal foil, are mentioned. A heat insulating material such as ceramic fiber has a function to block radiant heat, and a low emissivity material has a function to directly suppress radiant heat transfer. The heat transfer suppression layer has at least one of these functions.
芯金パイプ１１の外側には被覆耐火物１７が配置されている。言い換えれば、芯金パイプ１１は被覆耐火物１７中に埋設されている。このとき、芯金パイプ１１を被覆耐火物１７中で確実に固定するために、芯金パイプ１１の外管１３の外周面に金属製のスタッド１８が複数設けられている。 A coated refractory 17 is disposed on the outside of the metal core pipe 11. In other words, the cored pipe 11 is embedded in the coated refractory 17. At this time, in order to securely fix the cored pipe 11 in the coated refractory 17, a plurality of metal studs 18 are provided on the outer peripheral surface of the outer pipe 13 of the cored pipe 11.
以上の構成において、精錬処理のためのガスや処理剤は、内管１２に沿って搬送され、吹込管１４を通じて溶銑、溶鋼等の溶融金属に吹き込まれる。このとき、図１（ａ）に示すようにランスパイプ１０の先端部分は溶融金属に浸漬されるので、この溶融金属により加熱される。その熱は、被覆耐火物１７、外管１３、内管１２へと順次伝達されるが、本発明では、外管１３と内管１２との間に輻射伝熱抑制層１５及び空気層１６を設けているので、外管１３から内管１２への熱伝達を抑えることができ、芯金パイプ１１（内管１２）の温度上昇を抑制することができる。また、外管１３の外周面にスタッド１８が設けられているので、外管１３にはスタッド１８を介した熱伝達もあるが、前述のとおり外管１３と内管１２との間に輻射伝熱抑制層１５及び空気層１６を設けているので、外管１３から内管１２への熱伝達は抑えられる。このように本発明によれば、スタッド１８を使用する条件下においても、スタッド１８の外側に断熱材層を設けることなく、内管１２と外管１３との間に輻射伝熱抑制層１５及び空気層１６を設けるという簡単な構成で、芯金パイプ１１（内管１２）の温度上昇を抑制することができる。加えて、芯金パイプ１１は、内管１２と外管１３との二重管構造であるので、ランスパイプ１０としての十分な断面係数を確保することができる。なお、図１（ａ）にも示すように、外管１３は内管１２の全長にわたって設ける必要はなく、少なくともランスパイプ１０が溶融金属に浸漬される先端部分において設ければよい。 In the above configuration, the gas and the processing agent for the refining process are conveyed along the inner pipe 12 and blown into the molten metal such as hot metal and molten steel through the blow pipe 14. At this time, as shown in FIG. 1 (a), the tip portion of the lance pipe 10 is immersed in the molten metal, and is thus heated by the molten metal. The heat is sequentially transferred to the coated refractory 17, the outer pipe 13, and the inner pipe 12, but in the present invention, the radiation heat transfer suppressing layer 15 and the air layer 16 are interposed between the outer pipe 13 and the inner pipe 12. Since it is provided, the heat transfer from the outer pipe 13 to the inner pipe 12 can be suppressed, and the temperature rise of the cored pipe 11 (inner pipe 12) can be suppressed. Further, since the studs 18 are provided on the outer peripheral surface of the outer tube 13, there is also heat transfer through the studs 18 to the outer tube 13, but as described above, radiation is transmitted between the outer tube 13 and the inner tube 12. Since the heat suppression layer 15 and the air layer 16 are provided, heat transfer from the outer pipe 13 to the inner pipe 12 is suppressed. As described above, according to the present invention, the radiation heat transfer suppressing layer 15 and the heat transfer suppressing layer 15 are provided between the inner pipe 12 and the outer pipe 13 without providing the heat insulating material layer on the outside of the stud 18 under the conditions of using the stud 18. With a simple configuration in which the air layer 16 is provided, the temperature rise of the cored pipe 11 (inner pipe 12) can be suppressed. In addition, since the metal core pipe 11 has a double pipe structure of the inner pipe 12 and the outer pipe 13, it is possible to secure a sufficient sectional coefficient as the lance pipe 10. As shown in FIG. 1A, the outer pipe 13 does not have to be provided over the entire length of the inner pipe 12, and may be provided at least at the tip where the lance pipe 10 is immersed in the molten metal.
なお、本実施形態では、内管１２の外周面に沿って輻射伝熱抑制層１５を設け、この輻射伝熱抑制層１５の外側に空気層１６を設けたが、外管１３の内周面に沿って輻射伝熱抑制層１５を設け、この輻射伝熱抑制層１５の内側に空気層１６を設けてもよい。ただし、施工性等を考慮すると、本実施形態の例が好ましい。すなわち、輻射伝熱抑制層１５は、外管１３の内周面に沿って設けるよりも、内管１２の外周面に沿って設ける方が簡単である。そして、内管１２の外周面に輻射伝熱抑制層１５を設けてこの内管１２を外管１３内に挿入するようにすれば、輻射伝熱抑制層１５の外側に空気層を設けるための隙間が存在するから、内管１２を外管１３内に挿入しやすく、施工性が向上する。また、内管１２の外周面は外管１３の内周面に比べると低温であるから、内管１２の外周面に輻射伝熱抑制層１５を設ける方が、その輻射伝熱抑制層１５に要求される耐熱性のレベルが軽減され、輻射伝熱抑制層１５を構成する材料の選択の余地が増え、その結果、低コストの材料を選択することができる。この点からも、輻射伝熱抑制層１５は内管１２の外周面に沿って設けることが好ましい。 In the present embodiment, the radiation heat transfer suppression layer 15 is provided along the outer peripheral surface of the inner pipe 12 and the air layer 16 is provided outside the radiation heat transfer suppression layer 15, but the inner peripheral surface of the outer pipe 13 is The radiation heat transfer suppression layer 15 may be provided along the inner side of the radiation heat transfer suppression layer 15 and the air layer 16 may be provided. However, in consideration of workability and the like, the example of the present embodiment is preferable. That is, the radiation heat transfer suppression layer 15 is easier to provide along the outer peripheral surface of the inner pipe 12 than to provide along the inner peripheral surface of the outer pipe 13. Then, if the radiation heat transfer suppressing layer 15 is provided on the outer peripheral surface of the inner tube 12 and the inner tube 12 is inserted into the outer tube 13, an air layer is provided outside the radiation heat transfer suppressing layer 15. Since there is a gap, the inner pipe 12 can be easily inserted into the outer pipe 13, and the workability is improved. Further, since the outer peripheral surface of the inner pipe 12 has a temperature lower than that of the inner peripheral surface of the outer pipe 13, the radiation heat transfer suppression layer 15 is more effective when the radiation heat transfer suppression layer 15 is provided on the outer peripheral surface of the inner pipe 12. The required level of heat resistance is reduced, and the choice of the material forming the radiation heat transfer suppression layer 15 is increased, and as a result, a low cost material can be selected. Also from this point of view, it is preferable to provide the radiation heat transfer suppressing layer 15 along the outer peripheral surface of the inner pipe 12.
次に、本発明において内管と外管の間に輻射伝熱抑制層及び空気層を設けたことによる効果をシミュレーションした結果を示す。 Next, the result of having simulated the effect by providing a radiation heat transfer control layer and an air layer between an inner pipe and an outer pipe in the present invention is shown.
シミュレーションは、ソフトウェア「ＭＳＣ．Ｍａｒｃ２０１３」（エムエスシーソフトウェア株式会社）を用い、芯金パイプが相対的に低温になる条件（以下「低温条件」という。）と高温になる条件（以下「高温条件」という。）の２条件で行った。詳細なシミュレーション条件は表１に示すとおりである。なお、表１及び後述の説明からわかるように、低温条件はランスパイプが１３００℃の溶融金属に浸漬される条件、高温条件はランスパイプが１６００℃の溶融金属に浸漬される条件である。 The simulation is performed using software "MSC.Marc 2013" (MSC Software Inc.), the condition where the core metal pipe becomes relatively low temperature (hereinafter referred to as "low temperature condition") and the condition where the core metal pipe becomes high temperature (hereinafter "high temperature condition" It was done under two conditions. Detailed simulation conditions are as shown in Table 1. As can be seen from Table 1 and the following description, the low temperature conditions are conditions under which the lance pipe is immersed in the molten metal at 1300 ° C. The high temperature conditions are conditions under which the lance pipe is immersed in the molten metal at 1600 ° C.
シミュレーションは、ランスパイプの実際の使用条件に従い、溶融金属に浸漬する「加熱」と、溶融金属から引き上げて待機する「待機」とを繰り返すサイクルを想定して行い、高温条件と低温条件ではこれら加熱時間及び待機時間を変えた条件とし、それぞれの条件においてランスパイプの温度が定常化した状態を想定してシミュレーションを行った。このとき、ランスパイプの外周側からの伝熱については、加熱時には溶融金属からの熱伝導を考慮し、待機時には大気への熱伝導と輻射伝熱（放射伝熱）を考慮した。また、ランスパイプの内周側からの伝熱については、加熱時には芯金パイプ（内管）を流れるガスへの熱伝導を考慮し、待機時には芯金パイプ（内管）内のガスへの熱伝導を考慮した。さらに、加熱時及び待機時のいずれにおいても、芯金パイプの外管と内管との間の空気層における伝熱については、外管の内周面と内管の外周面が輻射伝熱（放射伝熱）する条件とし、形態係数は１．０とした。また、輻射率（放射率）については、特に断りがない限り外管の内周面、内管の外周面ともに０．９とした。さらに、ランスパイプを構成する芯金パイプ（内管及び外管）、輻射伝熱抑制層、並びに被覆耐火物の各物性値は表２のとおりとした。 The simulation is performed on the assumption that the cycle of "heating" to be immersed in the molten metal and "standby" to be pulled up and waiting from the molten metal is repeated according to the actual use conditions of the lance pipe. The simulation was performed on the assumption that the temperature of the lance pipe became steady under the conditions in which the time and the waiting time were changed. At this time, regarding heat transfer from the outer peripheral side of the lance pipe, heat conduction from the molten metal was taken into consideration during heating, and heat conduction to the atmosphere and radiation heat transfer (radiative heat transfer) were taken into consideration during standby. Further, regarding heat transfer from the inner peripheral side of the lance pipe, heat conduction to the gas flowing through the cored metal pipe (inner pipe) is taken into consideration during heating, and heat applied to the gas in the cored metal pipe (inner pipe) during standby. Conduction was considered. Furthermore, regarding the heat transfer in the air layer between the outer pipe and the inner pipe of the cored metal pipe both during heating and during standby, the inner peripheral surface of the outer pipe and the outer peripheral surface of the inner pipe The condition for radiation heat transfer was used, and the form factor was 1.0. Further, the emissivity (emissivity) was 0.9 for both the inner circumferential surface of the outer tube and the outer circumferential surface of the inner tube, unless otherwise noted. Furthermore, each physical property value of the metal core pipe (inner pipe and outer pipe) which comprises a lance pipe, a radiation heat transfer suppression layer, and a coated refractory was as Table 2.
図２Ａ〜Ｃは低温条件でのシミュレーション結果を示し、図３Ａ〜Ｃは高温条件でのシミュレーション結果を示す。以下、具体的に説明する。 2A-C show simulation results under low temperature conditions, and FIGS. 3A-C show simulation results under high temperature conditions. The details will be described below.
図２Ａは、低温条件において内管と外管との間に空気層のみがある場合のシミュレーション結果である。空気層による輻射伝熱は、一般的にステファン−ボルツマンの法則に従い、物体の温度（Ｔ）の４乗（Ｔ４）に比例して増大するところ、低温条件では輻射伝熱が少なく、結果として空気層が断熱効果を奏している。 FIG. 2A is a simulation result when there is only an air layer between the inner pipe and the outer pipe at low temperature conditions. The radiation heat transfer by the air layer generally increases in proportion to the fourth power (T 4 ) of the temperature of the object (T) according to the Stefan-Boltzmann law, but the radiation heat transfer is small at low temperature conditions, resulting in The air layer has a thermal insulation effect.
図２Ｂは、図１Ａと同様に低温条件において内管と外管との間に空気層のみがある場合において、外管の内周面及び内管の外周面の輻射率（放射率）を０．３と小さくしてシミュレーションした結果である。輻射伝熱がさらに抑制されることがわかる。このことは、内管と外管との間に空気層に加えて輻射伝熱抑制層を設けることで、内管の温度上昇を抑制できることを示している。 As in FIG. 1A, FIG. 2B shows that the emissivity (emissivity) of the inner peripheral surface of the outer pipe and the outer peripheral surface of the inner pipe is 0 when there is only an air layer between the inner pipe and the outer pipe under low temperature conditions. It is the result of making the simulation as small as .3. It can be seen that radiation heat transfer is further suppressed. This indicates that the temperature rise of the inner pipe can be suppressed by providing the radiation heat transfer suppression layer in addition to the air layer between the inner pipe and the outer pipe.
そこで、内管の外周面に輻射伝熱抑制層を設けてシミュレーションした結果が図２Ｃである。輻射伝熱抑制層を設けていない図２Ａに比べ、さらに内管の温度上昇が抑制されることがわかる。 Then, the result of having simulated by providing a radiation heat transfer suppression layer in the outer peripheral surface of an inner pipe | tube is FIG. 2C. It can be seen that the temperature rise of the inner pipe is further suppressed as compared to FIG. 2A in which the radiation heat transfer suppression layer is not provided.
次に、図３Ａは、高温条件において内管と外管との間に空気層のみがある場合のシミュレーション結果である。前述のとおり空気層による輻射伝熱は、一般的にステファン−ボルツマンの法則に従い、物体の温度（Ｔ）の４乗（Ｔ４）に比例して増大するところ、高温条件では輻射伝熱が多くなり、結果として空気層は殆んど断熱効果を奏していない。 Next, FIG. 3A is a simulation result in the case where there is only an air layer between the inner pipe and the outer pipe at high temperature conditions. As described above, the radiation heat transfer by the air layer generally increases in proportion to the fourth power (T 4 ) of the temperature of the object (T) according to the Stefan-Boltzmann law, but the radiation heat transfer is large at high temperature As a result, the air layer is hardly effective in heat insulation.
図３Ｂは、図３Ａと同様に高温条件において内管と外管との間に空気層のみがある場合において、外管の内周面及び内管の外周面の輻射率（放射率）を０．３と小さくしてシミュレーションした結果である。輻射伝熱が抑制される結果、内管の温度上昇が抑制されることがわかる。このことは、空気層による断熱効果が殆んど得られない高温条件においても、内管と外管との間に空気層に加えて輻射伝熱抑制層を設けることで、内管の温度上昇を抑制できることを示している。 As in FIG. 3A, FIG. 3B shows that the emissivity (emissivity) of the inner peripheral surface of the outer pipe and the outer peripheral surface of the inner pipe is 0 when there is only an air layer between the inner pipe and the outer pipe under high temperature conditions. It is the result of making the simulation as small as .3. As a result of suppressing the radiation heat transfer, it is understood that the temperature rise of the inner pipe is suppressed. This means that the temperature rise of the inner pipe is achieved by providing a radiation heat transfer suppression layer in addition to the air layer between the inner pipe and the outer pipe even under high temperature conditions where the heat insulation effect by the air layer can hardly be obtained. Indicates that it can be suppressed.
そこで、内管の外周面に輻射伝熱抑制層を設けてシミュレーションした結果が図３Ｃである。空気層に加えて輻射伝熱抑制層を設けることで、内管の温度上昇が抑制されることがわかる。 Then, the result of having simulated by providing a radiation heat transfer suppression layer in the outer peripheral surface of an inner pipe | tube is FIG. 3C. It can be seen that the temperature rise of the inner pipe is suppressed by providing the radiation heat transfer suppression layer in addition to the air layer.
このように、本発明に従い、内管と外管との間に空気層に加えて輻射伝熱抑制層を設けることで、低温条件及び高温条件のいずれにおいても、内管の温度上昇を効果的に抑制できることがわかる。 Thus, according to the present invention, by providing a radiation heat transfer suppression layer in addition to the air layer between the inner pipe and the outer pipe, the temperature rise of the inner pipe is effectively achieved under both the low temperature condition and the high temperature condition. It can be seen that
本発明の実施例及び比較例によるランスパイプを溶鋼鍋における精錬処理に適用し、その耐用性を評価した。その結果を表３に示す。 The lance pipe according to the embodiment of the present invention and the comparative example was applied to the refining treatment in a molten steel pan, and its durability was evaluated. The results are shown in Table 3.
表３中、実施例１は、図１に示した実施形態に従い、内管の外周面に沿って輻射伝熱抑制層（セラミックファイバー層）を設け、その外側に空気層を設けた例である、比較例１は、内管と外管との間に空気層のみを設け輻射伝熱抑制層を設けなかった例である。比較例２は、前述の特許文献１に開示された従来技術に従い、芯金パイプを内管のみの単管とし、その外周面に沿って断熱材層を設けた例である。なお、実施例１及び比較例１では、外管の外周に金属製のスタッドを設け、比較例２では、内管（単管）の外周に金属製のスタッドを設けた。 In Table 3, Example 1 is an example in which the radiation heat transfer suppressing layer (ceramic fiber layer) is provided along the outer peripheral surface of the inner pipe and the air layer is provided on the outside according to the embodiment shown in FIG. Comparative Example 1 is an example in which only the air layer is provided between the inner pipe and the outer pipe and the radiation heat transfer suppression layer is not provided. Comparative Example 2 is an example in which the metal core pipe is a single pipe of only the inner pipe and the heat insulating material layer is provided along the outer peripheral surface according to the prior art disclosed in the above-mentioned Patent Document 1. In Example 1 and Comparative Example 1, metal studs were provided on the outer periphery of the outer pipe, and in Comparative Example 2, metal studs were provided on the outer periphery of the inner pipe (single pipe).
耐用性は、溶鋼鍋にランスパイプを浸漬してから引き上げるまでを１チャージとし、ランスパイプが曲がり、その曲がった箇所から溶鋼が差し込んで剥落に至るまでのチャージ数を耐用チャージ数とし、この耐用チャージ数の大小によって評価した。表３では、比較例１の耐用チャージ数を１００として指数化した耐用性指数によって示した。耐用性指数が大きいほど耐用性に優れるということである。 The durability is one charge from immersion to pulling up of the lance pipe in the molten steel pot, the lance pipe is bent, and the number of charges from the bent point to the insertion of molten steel from the bent point is the durable charge number. It evaluated by the size of the charge number. In Table 3, the number of usable charges of Comparative Example 1 is indicated by 100, and it is indicated by an index of durability indexed. The larger the durability index, the better the durability.
表３より、本発明の実施例である実施例１は、比較例１、２に比べ、耐用性に優れることが確認された。比較例１は、輻射伝熱抑制層がないことから空気層による輻射伝熱を抑制できず、内管の温度が上昇した結果、十分な耐用性が得られなかったと推定される。比較例２は、内管（単管）の外周面に沿って断熱材層を有するものの、スタッドを介した熱伝達がある結果、内管の温度が上昇し、十分な耐用性が得られなかったと推定される。 From Table 3, it was confirmed that Example 1 which is an example of the present invention is superior in durability to Comparative Examples 1 and 2. The comparative example 1 can not suppress the radiation heat transfer by the air layer because there is no radiation heat transfer suppression layer, and as a result of the temperature rise of the inner pipe, it is presumed that sufficient durability can not be obtained. Although the comparative example 2 has a heat insulating material layer along the outer peripheral surface of the inner pipe (single pipe), as a result of heat transfer through the studs, the temperature of the inner pipe rises, and sufficient durability can not be obtained. It is estimated that
１０ ランスパイプ
１１ 芯金パイプ
１２ 内管
１３ 外管
１４ 吹込管
１５ 輻射伝熱抑制層
１６ 空気層
１７ 被覆耐火物
１８ スタッド
DESCRIPTION OF SYMBOLS 10 Lance pipe 11 Core metal pipe 12 Inner pipe 13 Outer pipe 14 Blow-in pipe 15 Radiation heat conduction suppression layer 16 Air layer 17 Coating refractory 18 Stud
Claims (2)
前記内管の外周面と前記外管の内周面との間に、輻射伝熱抑制層及び空気層を設けたことを特徴とする溶融金属の精錬処理用のランスパイプ。 A lance pipe for refining molten metal comprising: an inner pipe which is a transfer passage for carrying a powder processing agent for refining molten metal together with gas or gas; and an outer pipe disposed outside the inner pipe And
A lance pipe for refining molten metal characterized in that a radiation heat transfer suppressing layer and an air layer are provided between the outer peripheral surface of the inner pipe and the inner peripheral surface of the outer pipe.
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| JP2015119586A JP6518138B2 (en) | 2015-06-12 | 2015-06-12 | Lance pipe for smelting treatment of molten metal |
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| JPS5815826U (en) * | 1981-07-16 | 1983-01-31 | 住友金属工業株式会社 | Blast furnace auxiliary fuel injection burner |
| JPS5951054U (en) * | 1982-09-28 | 1984-04-04 | 日本鋼管株式会社 | Blow lance pipe for molten metal processing |
| JPH0530137U (en) * | 1991-10-02 | 1993-04-20 | 住友金属工業株式会社 | Coke oven furnace fastening device |
| JP5775476B2 (en) * | 2012-03-06 | 2015-09-09 | 新日鐵住金株式会社 | Reducing gas blowing method and blowing lance from blast furnace tuyere |
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