JPH0225512A - Tuyere for bottom-blowing in electric furnace - Google Patents
Tuyere for bottom-blowing in electric furnaceInfo
- Publication number
- JPH0225512A JPH0225512A JP63175481A JP17548188A JPH0225512A JP H0225512 A JPH0225512 A JP H0225512A JP 63175481 A JP63175481 A JP 63175481A JP 17548188 A JP17548188 A JP 17548188A JP H0225512 A JPH0225512 A JP H0225512A
- Authority
- JP
- Japan
- Prior art keywords
- tuyere
- gas
- blowing
- electric furnace
- nozzle
- 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.)
- Pending
Links
- 238000007664 blowing Methods 0.000 title claims abstract description 88
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 10
- 239000010959 steel Substances 0.000 claims abstract description 10
- 239000011810 insulating material Substances 0.000 claims abstract description 8
- 230000003028 elevating effect Effects 0.000 claims description 10
- 230000000149 penetrating effect Effects 0.000 claims description 3
- 238000003756 stirring Methods 0.000 claims description 3
- 229910052751 metal Inorganic materials 0.000 abstract description 19
- 239000002184 metal Substances 0.000 abstract description 19
- 239000000919 ceramic Substances 0.000 abstract description 10
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 abstract description 8
- 229910052742 iron Inorganic materials 0.000 abstract description 4
- 238000007670 refining Methods 0.000 abstract description 4
- 230000003628 erosive effect Effects 0.000 abstract description 3
- 238000005524 ceramic coating Methods 0.000 abstract 1
- 238000010891 electric arc Methods 0.000 abstract 1
- 238000010438 heat treatment Methods 0.000 abstract 1
- 239000007789 gas Substances 0.000 description 108
- 238000009826 distribution Methods 0.000 description 21
- 238000003780 insertion Methods 0.000 description 9
- 230000037431 insertion Effects 0.000 description 9
- 238000000034 method Methods 0.000 description 5
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 4
- CPLXHLVBOLITMK-UHFFFAOYSA-N Magnesium oxide Chemical compound [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 description 4
- 229910052799 carbon Inorganic materials 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 238000002844 melting Methods 0.000 description 4
- 230000008018 melting Effects 0.000 description 4
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 3
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 3
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 3
- 229910052760 oxygen Inorganic materials 0.000 description 3
- 239000001301 oxygen Substances 0.000 description 3
- 239000002893 slag Substances 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 229910052786 argon Inorganic materials 0.000 description 2
- 229910002092 carbon dioxide Inorganic materials 0.000 description 2
- 238000002347 injection Methods 0.000 description 2
- 239000007924 injection Substances 0.000 description 2
- 239000000395 magnesium oxide Substances 0.000 description 2
- 229910001220 stainless steel Inorganic materials 0.000 description 2
- 239000010935 stainless steel Substances 0.000 description 2
- 235000008733 Citrus aurantifolia Nutrition 0.000 description 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 229910001021 Ferroalloy Inorganic materials 0.000 description 1
- 229910052581 Si3N4 Inorganic materials 0.000 description 1
- 238000003723 Smelting Methods 0.000 description 1
- 235000011941 Tilia x europaea Nutrition 0.000 description 1
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- 229910002090 carbon oxide Inorganic materials 0.000 description 1
- 229910052804 chromium Inorganic materials 0.000 description 1
- 239000011651 chromium Substances 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 239000004571 lime Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 238000004904 shortening Methods 0.000 description 1
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 description 1
- 229910010271 silicon carbide Inorganic materials 0.000 description 1
- HQVNEWCFYHHQES-UHFFFAOYSA-N silicon nitride Chemical compound N12[Si]34N5[Si]62N3[Si]51N64 HQVNEWCFYHHQES-UHFFFAOYSA-N 0.000 description 1
- 238000009628 steelmaking Methods 0.000 description 1
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
Landscapes
- Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)
Abstract
Description
【発明の詳細な説明】
［産業上の利用分野コ
本発明は製鋼用電気炉の炉底に設けて溶鋼中にガスを吹
き込むための電気炉の底吹き用羽口に関する。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a bottom-blowing tuyere for an electric furnace for blowing gas into molten steel, which is provided at the bottom of an electric furnace for steelmaking.
［従来の技術］
第２図、第３図で、従来の電気炉底吹き精錬法を説明す
る。第２図は従来の底吹き電気炉の縦断面図で、第３図
は従来の底吹き電気炉の説明用の平面図である。１は電
極、２はガス吹き込み用羽口、３はガス吹き込み用羽口
挿入口、４は電気炉の炉底耐火物、５は溶鋼、６は電気
炉の鉄皮、７はスラグである。従来から転炉では普通に
行われている底吹き精錬法を電気炉において使用すると
、電炉内の溶ｍ５の深さが浅いために湯面上昇を招き易
く、湯暴れ過大による危険性が増大して安全性に欠ける
等の理由により採用されていなかった。しかしながら最
近ガス吹き込み用羽口２の形状やガス吹き込み方法の改
善がなされ、製銅時間の短縮、スラグ７の減少及び石灰
、合金鉄の使用原単位を引き下げることを目的に電気炉
の炉底耐火物４の一部であるガス吹き込み用羽口２から
、酸素、−酸化炭素、二酸化炭素、アルゴン、窒素等の
各種の吹き込みガスを、溶鋼ら中に吹き込み、溶鋼５を
攪拌することにより反応を促進する電気炉底吹き精錬法
が行われるようになった。[Prior Art] A conventional electric furnace bottom blowing refining method will be explained with reference to FIGS. 2 and 3. FIG. 2 is a longitudinal cross-sectional view of a conventional bottom-blown electric furnace, and FIG. 3 is an explanatory plan view of the conventional bottom-blown electric furnace. 1 is an electrode, 2 is a tuyere for blowing gas, 3 is an insertion port for a tuyere for blowing gas, 4 is a bottom refractory of an electric furnace, 5 is molten steel, 6 is an iron shell of the electric furnace, and 7 is slag. If the bottom-blowing refining method, which has been conventionally used in converters, is used in an electric furnace, the depth of the molten m5 in the electric furnace is shallow, which tends to cause the level of the molten metal to rise, increasing the risk of excessive melt overflow. However, it was not adopted due to its lack of safety. However, recently the shape of the gas blowing tuyere 2 and the gas blowing method have been improved, and the bottom refractory of the electric furnace has been improved with the aim of shortening the copper manufacturing time, reducing the amount of slag 7, and lowering the consumption unit of lime and ferroalloy. Various blowing gases such as oxygen, carbon oxide, carbon dioxide, argon, and nitrogen are blown into the molten steel through the gas blowing tuyere 2, which is a part of the material 4, and the reaction is caused by stirring the molten steel 5. The electric furnace bottom blowing smelting method started to be promoted.
そしてこのガス吹き込み用羽口挿入口３に挿入されたガ
ス吹き込み用羽口２としては、ポーラスプラグ、多数の
貫通細管を備えた多孔羽口ノズル、二重管羽口等の各種
のガス吹き込み用羽口２が使用されているが、吹き込み
ガス流量のコントロール、ガス吹き込み用羽口２の補修
等の容易性から多数の貫通細管を備えた多孔羽口ノズル
が使用されている。この多数の貫通細管を備えたガス吹
き込み羽口２は、その細管の内周に金属パイプ等のガス
吐出細管を装着されている。これはガス吹き込み羽口２
の強度を増大させたり、ガス（例えば酸素）によって耐
火物（マグカーボンなど）中のカーボンが酸素と反応す
るので、その耐火物の劣化（ｃ＋ｏ２→Ｃ０２）を防止
している。The gas blowing tuyere 2 inserted into this gas blowing tuyere insertion port 3 can be a porous plug, a porous tuyere nozzle with a large number of penetrating tubes, a double tube tuyere, etc. Although a tuyere 2 is used, a porous tuyere nozzle having a large number of through-tubes is used because it is easy to control the flow rate of blown gas and repair the tuyere 2 for blowing gas. The gas blowing tuyere 2 having a large number of through-tubes has a gas discharge capillary such as a metal pipe attached to the inner periphery of the capillary. This is gas blowing tuyere 2
The carbon in the refractory (Mag Carbon, etc.) reacts with oxygen due to the gas (e.g. oxygen), thereby preventing deterioration of the refractory (c+o2→C02).
［発明が解決しようとする課題］
第４図は従来の細管の内周に金属パイプを装着した電気
炉の底吹き用羽口部の拡大図である。この図で、８はガ
ス吐出口、９はガス分配室、１０はガス分配室金具、１
１はガス吹き込み用耐火物、１２は金属性のガス吐出細
管、１３はガス吹き込み用羽口の押さえ金具、１４は底
吹きガス供給管、１５はガス吹き込み用羽口の押さえ金
具を昇降させる昇降シリンダー １６は昇降シリンダー
のネジ込み部、１７は昇降シリンダー支持部材、１８は
ガス吹き込み用羽口の保護部材、１９は昇降シリンダー
支持部材１７とガス吹き込み用羽口の保護部材１８とを
繋ぐボルトである。ここで金属性の吐出細管１２の材質
はステンレス鋼が使用されている。金属性の吐出細管１
２の径は１〜５ｍｍΦで、本数は１０〜３０本配設され
ている。その金属性の吐出細管１２の間にはガス吹き込
み用耐火物１１として、マグネシア、マグネシア−カー
ボン、マグネシア−クロム、あるいは高アルミナ等が充
填されている。金属性の吐出細管１２はガス分配室金具
１０の上部に貫通され、ガス分配室９と繋がっている。[Problems to be Solved by the Invention] FIG. 4 is an enlarged view of a bottom-blowing tuyere portion of an electric furnace in which a metal pipe is attached to the inner periphery of a conventional thin tube. In this figure, 8 is a gas discharge port, 9 is a gas distribution chamber, 10 is a gas distribution chamber fitting, 1
1 is a refractory for gas blowing, 12 is a metal gas discharge thin tube, 13 is a holding fitting for a tuyere for gas blowing, 14 is a bottom blowing gas supply pipe, and 15 is an elevating device for raising and lowering a holding fitting for a tuyere for gas blowing. Cylinder 16 is a threaded part of the lifting cylinder, 17 is a lifting cylinder support member, 18 is a protection member for the gas blowing tuyere, and 19 is a bolt connecting the lifting cylinder support member 17 and the protection member 18 for the gas blowing tuyere. be. Here, stainless steel is used as the material of the metallic discharge tube 12. Metallic discharge tube 1
The diameter of the tubes 2 is 1 to 5 mmΦ, and the number of tubes is 10 to 30. Magnesia, magnesia-carbon, magnesia-chromium, high alumina, or the like is filled as a gas blowing refractory 11 between the metallic discharge tubes 12 . A metal discharge capillary tube 12 passes through the upper part of the gas distribution chamber fitting 10 and is connected to the gas distribution chamber 9.
底吹きガス供給管１４はガス分配室金具１０の下部に貫
通され、ガス分配室つと繋がっている。ガス吹き込み用
羽口２はガス吹き込み用羽口挿入装置（図示せず）によ
りガス吹き込み用羽口挿入口３に挿入される。The bottom-blown gas supply pipe 14 passes through the lower part of the gas distribution chamber fitting 10 and is connected to one gas distribution chamber. The gas blowing tuyere 2 is inserted into the gas blowing tuyere insertion port 3 by a gas blowing tuyere insertion device (not shown).
そして昇降シリンダー支持部材１７をガス吹き込み用羽
口の保護部材１８にボルト１９で繋ぎ、ガス吹き込み用
羽口の押さえ金具を昇降させる昇降シリンダー１５を作
動させると昇降シリンダーのネジ込み部１６が昇降する
。そうするとガス吹き込み用羽口の押さえ金具１３が昇
降しガス吹き込み用羽口挿入口３に確実にセットされる
。このような状態で電気炉の操業を続けていく内に電気
炉炉体の振動や電気炉の炉底耐火物４、ガス吹き込み用
耐火物１１及び鉄皮６等の熱膨張によりガス分配室金具
１０とガス吹き込み用羽口の押さえ金具１３及び、底吹
きガス供給管１４とガス吹き込み用羽口の押さえ金具１
３を昇降させる昇降リング−１５との間の接触が悪くな
り部分的に随れてしまう、この状態で通電、溶解すると
ガス分配室金具１０とガス吹き込み用羽口の押さえ金具
１３及び、底吹きガス供給管１４とガス吹き込み用羽口
の押さえ金具を昇降させる昇降リング−１５との間に高
電位がかかり、ガス分配室金具１０とガス吹き込み用羽
口の押さえ金具１３及び、底吹きガス供給管１４とガス
吹き込み用羽口の押さえ金具を昇降させる昇降リング−
１５との間に電位差が生じ、ガス分配室金具１０とガス
吹き込み用羽口の押さえ金具１３及び、底吹きガス供給
管１４とガス吹き込み用羽口の押さえ金具を昇降させる
昇降リング−１５との間にスパークが起こり、ガス分配
室金具１０や底吹きガス供給管１４が溶断し、ガス漏れ
や設備故障等の部属があった。 この発明はかかる事情
に鑑みてなされたものであって、ガス漏れや設備故障の
発生の少ない電気炉の底吹き用羽口を提供することを目
的とする。Then, when the lifting cylinder support member 17 is connected to the protection member 18 of the gas blowing tuyere with a bolt 19 and the lifting cylinder 15 that raises and lowers the presser fitting of the gas blowing tuyere is operated, the threaded part 16 of the lifting cylinder is raised and lowered. . Then, the presser metal fitting 13 of the gas blowing tuyere is raised and lowered, and is securely set in the gas blowing tuyere insertion opening 3. As the electric furnace continues to operate under such conditions, the gas distribution chamber metal fittings may be damaged due to vibration of the electric furnace body and thermal expansion of the bottom refractory 4, gas injection refractory 11, iron skin 6, etc. 10, a presser fitting 13 for the gas blowing tuyere, and a bottom blowing gas supply pipe 14 and a presser fitting 1 for the gas blowing tuyere.
The contact between the lifting ring 15 that lifts and lowers the gas distribution chamber fitting 10 and the holding fitting 13 of the gas blowing tuyere, and the bottom blowing ring 10 and the holding fitting 13 of the gas blowing tuyere, and the bottom blowing ring 10 and the holding fitting 13 of the gas blowing tuyere will be damaged if electricity is applied and melted in this state. A high potential is applied between the gas supply pipe 14 and the lifting ring 15 that raises and lowers the gas blowing tuyere holding fitting, and the gas distribution chamber fitting 10, the gas blowing tuyere holding fitting 13, and the bottom blowing gas supply. Elevating ring for elevating and lowering the pipe 14 and the holding fitting for the gas blowing tuyere.
A potential difference is generated between the gas distribution chamber fitting 10 and the holding fitting 13 of the gas blowing tuyere, and the elevating ring 15 for lifting and lowering the bottom blowing gas supply pipe 14 and the holding fitting of the gas blowing tuyere. During this period, sparks occurred, causing the gas distribution chamber fittings 10 and the bottom blowing gas supply pipe 14 to melt, resulting in gas leaks and equipment failures. The present invention has been made in view of the above circumstances, and it is an object of the present invention to provide a bottom-blowing tuyere for an electric furnace that is less likely to cause gas leakage or equipment failure.
［課題を解決するための手段］
この発明の電気炉の底吹き用羽口は、炉内の溶鋼にガス
を噴出して攪拌する多数の貫通細管を備えた多孔羽口ノ
ズルと、前記多孔羽口ノズルを支持する多孔羽口ノズル
支持金具と、前記多孔羽口ノズル支持金具を昇降させる
昇降シリンダーと、前記多孔羽口ノズルにガスを供給す
るガス供給配管とから構成された電気炉の底吹き用羽口
において、前記多孔羽口ノズルと前記多孔羽口ノズル支
持金具との間と、前記多孔羽口ノズル支持金具及び昇降
シリンダーと前記ガス供給配管との間に絶縁性材料を配
設することを特徴とする。[Means for Solving the Problems] The bottom-blowing tuyere for an electric furnace of the present invention includes a porous tuyere nozzle equipped with a large number of penetrating thin tubes that eject and stir gas into molten steel in the furnace, and the porous impeller. A bottom blowing electric furnace comprising a porous tuyere nozzle support fitting that supports a mouth nozzle, an elevating cylinder that raises and lowers the porous tuyere nozzle support fitting, and a gas supply pipe that supplies gas to the porous tuyere nozzle. In the tuyere, an insulating material is disposed between the porous tuyere nozzle and the porous tuyere nozzle support fitting, and between the porous tuyere nozzle support fitting, the lifting cylinder, and the gas supply piping. It is characterized by
［作用］
この発明の電気炉の底吹き用羽口は、多孔羽口ノズルど
前記多孔羽口ノズル支持金具との間と、前記多孔羽口ノ
ズル支持金具及び昇降シリンダーと前記ガス供給配管と
の間に絶縁性材料を配設しているので、電気炉の操業を
続けていく内に電気炉炉体の振動や電気炉の炉底耐火物
、ガス吹き込み用耐火物及び鉄皮等の熱膨張によりガス
分配室金具とガス吹き込み用羽口の押さえ金具及び、底
吹きガス供給管とガス吹き込み用羽口の押さえ金具を昇
降させる昇降リンダ−１５との間の接触が悪くなり部分
的に離れても、この隙間には絶縁性材料が配設されてい
るので、高い電位差が発生しない。[Function] The bottom-blowing tuyere for an electric furnace of the present invention has a structure in which the porous tuyere nozzle and the porous tuyere nozzle support fitting are connected to each other, and between the porous tuyere nozzle support fitting, the lifting cylinder, and the gas supply piping. Since an insulating material is placed in between, as the electric furnace continues to operate, vibrations of the electric furnace body and thermal expansion of the electric furnace bottom refractory, gas injection refractory, steel shell, etc. Due to this, the contact between the gas distribution chamber fitting and the holding fitting of the gas blowing tuyere and the lifting cylinder 15 for lifting and lowering the bottom blowing gas supply pipe and the holding fitting of the gas blowing tuyere became poor, and they partially separated. However, since an insulating material is provided in this gap, a high potential difference does not occur.
［実施例］
添付図面を参照しながらこの発明の一実施例について説
明する。第１図は本発明の細管の内周に金属パイプを装
着した電気炉の底吹き用羽口部の拡大図である。２１は
セラミックシート、２２はセラミック被覆パイプである
０図面上のその他の番号は従来の技術で説明したので省
略する。ここで金属性の吐出細管１２の材質はステンレ
ス鋼が使用されている。金属性の吐出細管１２の径は１
■Φで、本数は２３本配設されている。その金属性の吐
出細管１２の間にはガス吹き込み用耐火物１１として、
マグネシア−カーボンが充填されている。金属性の吐出
細管１２はガス分配室金具１０の上部に貫通され、ガス
分配室９と繋がっている。底吹きガス供給管１４く内径
はＩＩＩＩｌΦ）はガス分配室金具１０の下部に貫通さ
れ、ガス分配室９と繋がっている。ガス吹き込み用羽口
２はガス吹き込み用羽口挿入装置（図示せず）によりガ
ス吹き込み用羽口挿入口３に挿入される。そして昇降シ
リンダー支持部材１７をガス吹き込み用羽口の保護部材
１８にボルト１９で繋ぎ、ガス吹き込み用羽口の押さえ
金具を昇降させる昇降シリンダー１５を作動させると昇
降シリンダーのネジ込み部が昇降する。そうするとガス
吹き込み用羽口の押さえ金具１３が昇降しガス吹き込み
用羽口挿入口３に確実にセットされる。ここでガス分配
室金具１０の下部にセラミックシート２１配置し、底吹
きガス供給管１４の外周部にはセラミック被覆パイプ２
２を配置した。このセラミックの材質は炭化珪素、窒化
珪素質、サイアロン等である。[Embodiment] An embodiment of the present invention will be described with reference to the accompanying drawings. FIG. 1 is an enlarged view of a bottom-blowing tuyere portion of an electric furnace in which a metal pipe is attached to the inner periphery of a thin tube according to the present invention. 21 is a ceramic sheet, and 22 is a ceramic coated pipe.Other numbers on the drawing have been explained in the related art, and will therefore be omitted. Here, stainless steel is used as the material of the metallic discharge tube 12. The diameter of the metallic discharge tube 12 is 1
■Φ, and the number is 23. Between the metal discharge tubes 12, a gas blowing refractory 11 is provided.
Filled with magnesia carbon. A metal discharge capillary tube 12 passes through the upper part of the gas distribution chamber fitting 10 and is connected to the gas distribution chamber 9. The bottom-blown gas supply pipe 14 (with an inner diameter of IIIlΦ) passes through the lower part of the gas distribution chamber fitting 10 and is connected to the gas distribution chamber 9. The gas blowing tuyere 2 is inserted into the gas blowing tuyere insertion port 3 by a gas blowing tuyere insertion device (not shown). When the lifting cylinder support member 17 is connected to the protection member 18 of the gas blowing tuyere with a bolt 19 and the lifting cylinder 15 for raising and lowering the presser fitting of the gas blowing tuyere is operated, the threaded part of the lifting cylinder is raised and lowered. Then, the presser metal fitting 13 of the gas blowing tuyere is raised and lowered, and is securely set in the gas blowing tuyere insertion opening 3. Here, a ceramic sheet 21 is placed at the bottom of the gas distribution chamber fitting 10, and a ceramic coated pipe 2 is placed on the outer periphery of the bottom-blown gas supply pipe 14.
2 was placed. The material of this ceramic is silicon carbide, silicon nitride, sialon, or the like.
本発明の実施例の５０７ｏｎ電気炉の例で説明する。ガ
ス吹き込み用羽口２は電気炉の炉底に各電極のピッチ−
クルから電気炉の炉壁側に０〜８００ ｌｌＱｍの位置
に配置した。An example of a 507-on electric furnace according to an embodiment of the present invention will be explained. The gas blowing tuyeres 2 are arranged at the pitch of each electrode at the bottom of the electric furnace.
It was placed at a position of 0 to 800 1Qm from the furnace wall side of the electric furnace.
ガス吹き込み用羽口２の形状は截頭円雄型で、ナイズは
、頭部（炉内側は８０）Φ、炉壁側は１３０１Φ、長さ
は７００■で、ガス吹き込み用羽口２炉内側の吐出孔８
からはアルゴンガスが溶鋼中に、溶解期、精錬期ともア
ルゴンガスの各ガス吹き込み羽口２より１本当たり７０
Ｎ ｒｄ ／ ｍｉｓ吹き込んだ、ガスの吹き込み時
間は１００分である。The shape of the gas blowing tuyere 2 is a truncated male shape, the size is Φ on the head (80 mm on the inside of the furnace), 1301 mm on the furnace wall side, and 700 mm in length. Discharge hole 8
From then on, argon gas is injected into the molten steel at a rate of 70% per tuyere from each tuyere 2 during both the melting and refining stages.
The gas blowing time was 100 minutes.
このような操業条件で本発明の実施例を行った結果、第
１表に示すように従来法では、ガス分配室金具の溶損、
底吹きガス供給管の溶損等の問題があったが、本発明法
では、多孔羽口ノズルと前記多孔羽口ノズル支持金具と
の間と、多孔羽口ノズル支持金具及び昇降シリンダーと
前記ガス供給配管との間に絶縁性材料を配設するので、
前記の問題は解消される。As a result of carrying out the embodiment of the present invention under such operating conditions, as shown in Table 1, in the conventional method, there were no problems such as melting and damage of the gas distribution chamber fittings.
There were problems such as erosion of the bottom blowing gas supply pipe, but in the method of the present invention, the gas Since an insulating material is placed between the supply piping,
The above problem is resolved.
第 １ 表
［発明の効果〕
この発明は、多孔羽口ノズルと多孔羽ロノズル支持金具
との間と、多孔羽口ノズル支持金具及び昇降シリンダー
とガス供給配管との間に絶縁性材料を配設されているの
で、前記部材との電位差が生ずることがなく、ガス分配
室金具の溶損、底吹きガス供給管の溶損等の問題が発生
しない、よって電気炉の生産性が向上する。Table 1 [Effects of the Invention] This invention provides an insulating material between the porous tuyere nozzle and the porous tuyere nozzle support fitting, and between the porous tuyere nozzle support fitting, the lifting cylinder, and the gas supply piping. Therefore, there is no potential difference with the above-mentioned members, and problems such as melting of the gas distribution chamber fittings and melting of the bottom blowing gas supply pipe do not occur, thereby improving the productivity of the electric furnace.
第１図は本発明の細管の内周に金属パイプを装着した電
気炉の底吹き用羽口部の拡大図、第２図は従来の底吹き
電気炉の縦断面図、第３図は従来の底吹き電気炉の平面
図、第４図は従来の細管の内周に金属パイプを装着した
電気炉の底吹き用羽口部の拡大図である。
１・・・電極、２・・・ガス吹き込み用羽口、３・・・
ガス吹き込み用羽口挿入口、
４・・・電気炉の炉底耐火物、５・・・溶鋼、６・・・
電気炉の鉄皮、７・・・スラグ、８・・・ガス吐出口、
９・・・ガス分配室、１０・・・ガス分配室金具、１１
・・・ガス吹き込み用耐火物、
１２・・・金属性のガス吐出細管、
１３・・・ガス吹き込み用羽口の押さえ金具、１４・・
・底吹きガス供給管、
１５・・・ガス吹き込み用羽口の押さえ金具を昇降させ
る昇降シリンダー
１６・・・昇降シリンダーのネジ込み部、１７・・・昇
降シリンダー支持部材、
１８・・・ガス吹き込み用羽口の保護部材、１９・・・
昇降シリンダー支持部材とガス吹き込み用羽口の保護部
材を繋ぐボルト、
２１・・・セラミックシート、
２２・・・セラミック被覆パイプ。Fig. 1 is an enlarged view of the bottom-blowing tuyere of an electric furnace in which a metal pipe is attached to the inner periphery of the thin tube of the present invention, Fig. 2 is a vertical cross-sectional view of a conventional bottom-blowing electric furnace, and Fig. 3 is a conventional FIG. 4 is an enlarged view of the bottom-blowing tuyeres of an electric furnace in which a metal pipe is attached to the inner periphery of a conventional thin tube. 1... Electrode, 2... Tuyere for gas blowing, 3...
Tuyere insertion port for gas blowing, 4... Hearth bottom refractory of electric furnace, 5... Molten steel, 6...
Iron shell of electric furnace, 7...Slag, 8...Gas discharge port,
9... Gas distribution chamber, 10... Gas distribution chamber fitting, 11
... Refractory for gas blowing, 12... Metallic gas discharge tube, 13... Gas blowing tuyere holding fitting, 14...
・Bottom blowing gas supply pipe, 15... Elevating cylinder for elevating the holding fitting of the gas blowing tuyere 16... Threaded part of the elevating cylinder, 17... Elevating cylinder support member, 18... Gas blowing Protection member for tuyere, 19...
Bolts connecting the lifting cylinder support member and the protection member of the gas blowing tuyere, 21... Ceramic sheet, 22... Ceramic coated pipe.
Claims (1)
を備えた多孔羽口ノズルと、前記多孔羽口ノズルを支持
する多孔羽口ノズル支持金具と、前記多孔羽口ノズル支
持金具を昇降させる昇降シリンダーと、前記多孔羽口ノ
ズルにガスを供給するガス供給配管とから構成された電
気炉の底吹き用羽口において、前記多孔羽口ノズルと前
記多孔羽口ノズル支持金具との間と、前記多孔羽口ノズ
ル支持金具及び昇降シリンダーと前記ガス供給配管との
間に絶縁性材料を配設することを特徴とする電気炉の底
吹き用羽口。A porous tuyere nozzle equipped with a large number of penetrating thin tubes that eject and stir gas into the molten steel in the furnace, a porous tuyere nozzle support fitting that supports the porous tuyere nozzle, and a porous tuyere nozzle support fitting that is moved up and down. In a bottom-blowing tuyere for an electric furnace, the bottom-blowing tuyere is comprised of an elevating cylinder that allows the tuyere to move, and a gas supply pipe that supplies gas to the porous tuyere nozzle. A bottom-blowing tuyere for an electric furnace, characterized in that an insulating material is disposed between the porous tuyere nozzle support fitting, the lifting cylinder, and the gas supply pipe.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63175481A JPH0225512A (en) | 1988-07-14 | 1988-07-14 | Tuyere for bottom-blowing in electric furnace |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63175481A JPH0225512A (en) | 1988-07-14 | 1988-07-14 | Tuyere for bottom-blowing in electric furnace |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0225512A true JPH0225512A (en) | 1990-01-29 |
Family
ID=15996795
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP63175481A Pending JPH0225512A (en) | 1988-07-14 | 1988-07-14 | Tuyere for bottom-blowing in electric furnace |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0225512A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH03274383A (en) * | 1990-02-10 | 1991-12-05 | Nippon Steel Corp | Electric furnace structure and its operating method |
| JPH0474290U (en) * | 1990-11-07 | 1992-06-29 | ||
| US5637285A (en) * | 1996-01-30 | 1997-06-10 | Air Products And Chemicals, Inc. | Process for nitrogen trifluoride synthesis |
| JP2007119294A (en) * | 2005-10-27 | 2007-05-17 | Showa Denko Kk | Method for production of nitrogen trifluoride |
-
1988
- 1988-07-14 JP JP63175481A patent/JPH0225512A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH03274383A (en) * | 1990-02-10 | 1991-12-05 | Nippon Steel Corp | Electric furnace structure and its operating method |
| JPH0474290U (en) * | 1990-11-07 | 1992-06-29 | ||
| US5637285A (en) * | 1996-01-30 | 1997-06-10 | Air Products And Chemicals, Inc. | Process for nitrogen trifluoride synthesis |
| JP2007119294A (en) * | 2005-10-27 | 2007-05-17 | Showa Denko Kk | Method for production of nitrogen trifluoride |
| JP4624905B2 (en) * | 2005-10-27 | 2011-02-02 | 昭和電工株式会社 | Method for producing nitrogen trifluoride |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| EP0375657A1 (en) | Melting furnace | |
| JP5155503B2 (en) | Stable pause operation in a method for producing molten metal | |
| KR100611835B1 (en) | Multi-function lance for a vacuum degassing chamber and a method of using the same | |
| US4720837A (en) | Ladle furnace | |
| US4749408A (en) | Method of bottom blowing operation of a steel making electric furnace | |
| JP5677935B2 (en) | Burner / injector panel device | |
| JPH0225512A (en) | Tuyere for bottom-blowing in electric furnace | |
| JPS6360092B2 (en) | ||
| US4410996A (en) | Melt reduction arc furnace | |
| CA1330103C (en) | Method for smelting reduction in electric furnace | |
| JP2000313915A (en) | Immersion tube in rh degassing apparatus and manufacture thereof | |
| JPH07292403A (en) | Brick structure of iron tapping hole of blast furnace | |
| JP2718093B2 (en) | Electric furnace with tuyere | |
| JPWO2019064433A1 (en) | Operation method of melting and refining furnace and melting and refining furnace | |
| CN2228213Y (en) | Bottom-blowing gas supply element for electric arc furnace | |
| KR100471459B1 (en) | Electric arc furnace for steel manufacturing | |
| EP0598221A1 (en) | A method for blowing oxidizing gases into molten metal | |
| JP3247855B2 (en) | Water cooling panel for metal smelting furnace and metal smelting furnace | |
| CN114959187A (en) | Thermal protection method for RH dip pipe argon hose | |
| CN1048326C (en) | Compound type air supply device for electric arc furnace bottom blowing | |
| JPH0675746B2 (en) | Water-cooled ceiling lid for ladle | |
| RU25320U1 (en) | OXYGEN MELT BLOWING OXYGEN | |
| JPH0277517A (en) | Method and device for heating rh vacuum degasification vessel | |
| JPS6223052B2 (en) | ||
| JPH0343595Y2 (en) |