JPS622607B2 - - Google Patents
Info
- Publication number
- JPS622607B2 JPS622607B2 JP13632080A JP13632080A JPS622607B2 JP S622607 B2 JPS622607 B2 JP S622607B2 JP 13632080 A JP13632080 A JP 13632080A JP 13632080 A JP13632080 A JP 13632080A JP S622607 B2 JPS622607 B2 JP S622607B2
- Authority
- JP
- Japan
- Prior art keywords
- gas
- furnace
- electric furnace
- electrode
- hearth
- 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.)
- Expired
Links
- 239000007789 gas Substances 0.000 claims description 35
- 229910000831 Steel Inorganic materials 0.000 claims description 15
- 239000010959 steel Substances 0.000 claims description 15
- 238000009628 steelmaking Methods 0.000 claims description 12
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 10
- 239000001301 oxygen Substances 0.000 claims description 10
- 229910052760 oxygen Inorganic materials 0.000 claims description 10
- 239000011261 inert gas Substances 0.000 claims description 6
- 230000001590 oxidative effect Effects 0.000 claims description 4
- 230000037431 insertion Effects 0.000 claims 1
- 238000003780 insertion Methods 0.000 claims 1
- 238000007664 blowing Methods 0.000 description 17
- 238000009991 scouring Methods 0.000 description 10
- 238000002844 melting Methods 0.000 description 9
- 230000008018 melting Effects 0.000 description 9
- 239000002184 metal Substances 0.000 description 8
- 229910052751 metal Inorganic materials 0.000 description 8
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 4
- 229910052786 argon Inorganic materials 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 238000006477 desulfuration reaction Methods 0.000 description 3
- 230000023556 desulfurization Effects 0.000 description 3
- ODINCKMPIJJUCX-UHFFFAOYSA-N Calcium oxide Chemical compound [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 2
- 238000005261 decarburization Methods 0.000 description 2
- 238000004090 dissolution Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000004615 ingredient Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000003647 oxidation Effects 0.000 description 2
- 238000007254 oxidation reaction Methods 0.000 description 2
- 239000002893 slag Substances 0.000 description 2
- 238000003756 stirring Methods 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 229910001021 Ferroalloy Inorganic materials 0.000 description 1
- 241001417490 Sillaginidae Species 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 235000012255 calcium oxide Nutrition 0.000 description 1
- 239000000292 calcium oxide Substances 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 230000001737 promoting effect Effects 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)
- Vertical, Hearth, Or Arc Furnaces (AREA)
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は、冷材スクラツプを充填し、溶解、精
練を行なう製鋼用電気炉に関する。DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to an electric furnace for steel making which is filled with cold material scrap and melts and smelts the steel scrap.
この種の製鋼用電気炉は特開昭50−92807号公
報に詳細に開示されている。そこでは、電気炉を
利用した鋼の製造は、まず電気炉にスクラツプを
装填して電極に通電し溶解するもので、溶解を促
進させるためにランスパイプにて酸素を供給し、
精練のために不活性ガスを供給することが行なわ
れている。溶解が完了した後は、脱炭のために合
金鉄等を入れた取鍋にて成分調整を行ない造塊工
程に送られていた。
This type of electric furnace for steelmaking is disclosed in detail in Japanese Patent Laid-Open No. 50-92807. In order to manufacture steel using an electric furnace, scrap is first loaded into the electric furnace and then energized through the electrodes to melt it.Oxygen is supplied through a lance pipe to accelerate melting.
Inert gas is supplied for scouring. After the melting was completed, the ingredients were adjusted in a ladle containing ferroalloy for decarburization, and then sent to the ingot-making process.
しかしながら、従来の製鋼用電気炉にはつぎの
問題があつた。
However, conventional electric furnaces for steelmaking have the following problems.
イ 酸素やアルゴンガスの吹き込み用ランスパイ
プは、２〜３本で行なわれていたため、撹拌が
不十分であり、溶解の促進や、均一な精練を得
ることが困難であつた。(a) Since two or three lance pipes were used for blowing in oxygen or argon gas, stirring was insufficient and it was difficult to promote dissolution and obtain uniform scouring.
ロ 吹き込み口が通常電極の真下にあるか、また
は電極側に向けてガスを吹き込んでいたため、
炉内のスクラツプの状態によつては、ガスの吹
き上げによる湯面の激しい飛びあがりによつ
て、溶解、精練中に電極と溶解スクラツプ間の
アークに不安定を生じる。(b) The gas inlet was normally located directly below the electrode, or the gas was blown toward the electrode.
Depending on the condition of the scrap in the furnace, the arc between the electrode and the molten scrap may become unstable during melting and scouring due to the rapid rise of the molten metal surface due to the gas blowing up.
ハ 溶解スクラツプにガスを供給するためにパイ
プをさし込む作業は炉底部において人手により
行なうため、高熱作業、重筋労働を伴なう困難
な作業となつていた。c. The work of inserting pipes to supply gas to the melted scrap was done manually at the bottom of the furnace, which was difficult work that involved high heat and heavy physical labor.
本発明は、酸素やアルゴンガスの吹き込み構造
を従来の構造から変えることにより、上記イ、
ロ、ハの問題を解消することを目的とする。 The present invention achieves the above-mentioned steps by changing the structure for blowing oxygen and argon gas from the conventional structure.
The purpose is to solve problems B and C.
上記目的を達成するための本発明に係る製鋼用
電気炉は、酸素などの酸化性ガス、あるいはAr
などの不活性ガスの吹き込み口を炉床部鋼浴部に
設け、炉上方から炉蓋を貫通させて電極を炉内に
垂下させ、冷材スクラツプを充填して、溶解、精
練を行なう製鋼用電気炉において、前記吹き込み
口を炉床部鋼浴深さの２分の１以下の炉底でかつ
電極真直下方の電極径面積部を避けた位置に、複
数の同心円上に多数配置し、多数の吹き込み口を
１つのガスホルダに連通集合させ、該１つのガス
ホルダに１つのガス管を接続して該ガス管へのガ
ス供給手段の吹き込み口を電気炉下方から側方に
ずらしたことを特徴とする製鋼用電気炉から成
る。
The electric furnace for steel making according to the present invention for achieving the above object uses oxidizing gas such as oxygen or Ar
For steelmaking, an inert gas inlet such as gas is provided in the steel bath part of the hearth, the electrode is hung down into the furnace by penetrating the furnace lid from above the furnace, and cold material scrap is filled for melting and scouring. In the electric furnace, a large number of the blowing ports are arranged on a plurality of concentric circles at the bottom of the hearth at a depth of one-half or less of the steel bath depth and at a position avoiding the electrode diameter area directly below the electrode, It is characterized in that a large number of inlets are connected and gathered in one gas holder, one gas pipe is connected to the one gas holder, and the inlet of the gas supply means to the gas pipe is shifted from the bottom of the electric furnace to the side. It consists of an electric furnace for steelmaking.
上記製鋼用電気炉においては、多数（従来のよ
うな２〜３本の数は含まず、少なくとも10本以
上）の吹き込み口からガスが吹き込まれるので、
ガスによる溶湯の撹拌が発揮され、溶解の促進、
均一成分を得る精練が促進される。
In the above-mentioned steelmaking electric furnace, gas is blown into the furnace through a large number of inlets (at least 10 or more, not including the conventional 2-3 inlets).
The gas stirs the molten metal, promoting dissolution,
Scouring to obtain homogeneous ingredients is facilitated.
また、吹き込み口は炉床部鋼溶深さの２分の１
以下の位置にあるので、吹き込まれたガスが溶湯
表面に達するまでに上方への勢いは鈍化され、湯
面の波立ちが抑制される。また、電極真直下方に
は設けられていないので、電極に向つて溶湯がは
ね上ることもない。これらによつてアークの不安
定は生じない。 In addition, the inlet is 1/2 of the depth of steel melting in the hearth.
Because of the following position, the upward momentum of the blown gas is slowed down before it reaches the molten metal surface, suppressing ripples on the molten metal surface. Furthermore, since it is not provided directly below the electrode, molten metal will not splash up toward the electrode. These do not cause arc instability.
さらに、ガス管へのホース等のさし込みは、従
来のように１本１本のランスパイプにさし込むの
ではなく、ガスホルダでまとめ、そのガス管に１
本さし込めばよいので作業量は少なく、かつ炉底
下方の高温部から外した位置にガス管への接続口
を配置してあるので、高熱作業から解消される。 Furthermore, when inserting hoses into gas pipes, instead of inserting them into each lance pipe one by one as in the past, they are grouped together in a gas holder, and one hose is inserted into the gas pipe.
The amount of work required is small because all you have to do is plug it in, and the connection port to the gas pipe is located below the bottom of the furnace, away from the high-temperature area, eliminating the need for high-temperature work.
以下に、本発明に係る製鋼用電気炉の望ましい
実施例を、図面を参照して説明する。
Hereinafter, preferred embodiments of the electric furnace for steel making according to the present invention will be described with reference to the drawings.
製鋼用電気炉１において、冷材スクラツプＡを
装填して溶解、精練を行なう際、電極２直下の電
極径面積部を避けた炉床鋼浴深さの２分の１以下
の同心円上に配置された羽口又は吹込み口３から
酸素などの酸化性ガス、或いはAr、N2などの不
活性ガスを吹き込むように電気炉１が構成されて
いる。 In the steelmaking electric furnace 1, when loading the cold material scrap A for melting and scouring, it is placed on a concentric circle of less than half the depth of the hearth steel bath, avoiding the electrode diameter area directly below the electrode 2. The electric furnace 1 is configured so that an oxidizing gas such as oxygen or an inert gas such as Ar or N 2 is blown into the tuyere or inlet 3 .
すなわち第１図は冷材スクラツプＡの溶解初期
を示し、第２図は精練期を電気炉上の縦断面図で
あり、炉体４の炉床部には、ガス管５からガス吹
き込みホルダー６を介してガスを吹き込む吹き込
み管７が設けられており、吹き込み管２の羽口又
は吹き込み口３は第３図に示す如く、通電による
電極２からのアークの安定をはかるため、電極断
面積直下に相当する部分には設けず、炉床鋼浴深
さの２分の１以下の同心円上に配置されている。 That is, FIG. 1 shows the initial stage of melting of cold material scrap A, and FIG. 2 is a longitudinal cross-sectional view of the electric furnace during the scouring stage. A blowing pipe 7 is provided for blowing gas through the blowing pipe 2. As shown in FIG. It is not provided in a portion corresponding to the depth of the hearth steel bath, but is placed on a concentric circle of one-half or less of the depth of the hearth steel bath.
また、図中８は炉蓋、９は溶解した溶湯、１０
はアーク、１１は炉体４の作業口、９ａは鋼浴９
上に浮いたスラグである。 In addition, in the figure, 8 is the furnace lid, 9 is the melted molten metal, and 10 is the furnace lid.
is the arc, 11 is the working port of the furnace body 4, and 9a is the steel bath 9.
This is the slag that floats to the top.
従つて電気炉操業時は、通電開始後Ar、N2な
どの不活性ガスを吹き込み口３から吹き込みなが
ら、溶解の進行に従つて、炉床の湯留り生成に合
わせ、吹き込み口３からのガスを酸素などの酸化
性ガスに切り換えていく。そしてスクラツプＡが
完全溶解した後、酸化期においては酸素吹き込み
による脱炭、還元期においてはAr、N2などの不
活性ガス吹き込みによる脱硫、脱酸の促進ととも
に、脱硫、脱酸剤を吹き込む場合、湯面からのガ
スの吹き抜け、おびよ湯面の踊を抑えるため、吹
き込みガス圧、量の調整にともない、羽口又は吹
き込み口３の配置は前述したように炉床鋼浴深さ
の２分の１以下としている。 Therefore, when operating an electric furnace, inert gas such as Ar or N 2 is blown from the blowing port 3 after electricity is started, and as the melting progresses, the gas is blown from the blowing port 3 in accordance with the formation of molten metal in the hearth. The gas is switched to an oxidizing gas such as oxygen. After Scrap A is completely dissolved, decarburization is carried out by blowing oxygen during the oxidation period, desulfurization and deoxidation are promoted by blowing inert gas such as Ar and N2 during the reduction period, and desulfurization and deoxidizing agents are blown into the process. In order to suppress the blow-through of gas from the hot water surface and the dance of the hot water surface, the tuyere or blow-in port 3 is arranged at a depth 2 times the depth of the hearth steel bath, as described above, in accordance with the adjustment of the blowing gas pressure and amount. This is less than one-fold.
ここで鋼浴深さは大型炉でも最大１ｍ程度であ
り、このとき羽口配置は炉床内鋼浴深さ500mm以
下となつている。 Here, the maximum depth of the steel bath is about 1 m even in a large furnace, and in this case, the tuyere arrangement is such that the depth of the steel bath in the hearth is 500 mm or less.
上述したように、鋼の製造において、従来の精
練工程における酸化期では炉前作業口或いは補助
作業口から入手によつてランスパイプにより酸素
吹き込みを行なうなど熱間重筋作業であつたが、
この発明による電気炉では釦による遠隔操作又は
コンピユータ管理による酸素吹き込みの半自動化
あるいは全自動化が可能となる。
As mentioned above, in the production of steel, the oxidation period in the conventional scouring process involved hot, heavy-duty work, such as injecting oxygen with a lance pipe obtained from the furnace front work opening or auxiliary work opening.
In the electric furnace according to the present invention, oxygen injection can be semi-automated or fully automated by remote control using a button or by computer management.
また、この発明による製鋼用電気炉によれば、
吹き込みガス圧、量の調整が出来静かに吹き込め
るのでガス吹き込みによる溶鋼面の踊り、揺動な
どの現象は起らず、スクラツプの溶解が効果的に
行なわれるものである。 Further, according to the electric furnace for steel making according to the present invention,
Since the blowing gas pressure and amount can be adjusted and the blowing can be carried out quietly, phenomena such as dancing or shaking of the molten steel surface due to gas blowing do not occur, and scrap is effectively melted.
また、炉前の熱間重筋作業がいらなくなり、遠
隔操作或いは自動化が可能であり作業性が向上す
るなどの効果を奏する。 In addition, there is no need for heavy manual work in front of the furnace, remote control or automation is possible, and work efficiency is improved.
なお、精練工程における還元期の脱硫、脱酸を
促進させるために炉床吹き込み管から微粉状の焼
石灰合金鉄、或いは造滓剤等を吹き込むことも可
能である。 Incidentally, in order to promote desulfurization and deoxidation during the reduction period in the scouring process, it is also possible to inject finely powdered burnt lime alloy iron or a slag-forming agent from the hearth blowing pipe.
第１図は本発明による溶解初期を示す電気炉の
縦断面図、第２図は仝上精練期を示す電気炉の縦
断面図、第３図は炉床羽口の配置図を示す平面図
である。
１…電気炉、２…電極、３…羽口又は吹き込み
口、４…炉体、９…溶湯、１２…スラグ。
Fig. 1 is a longitudinal sectional view of an electric furnace showing the initial stage of melting according to the present invention, Fig. 2 is a longitudinal sectional view of the electric furnace showing the upper scouring stage, and Fig. 3 is a plan view showing the arrangement of hearth tuyeres. It is. DESCRIPTION OF SYMBOLS 1... Electric furnace, 2... Electrode, 3... Tuyere or blowing port, 4... Furnace body, 9... Molten metal, 12... Slag.
Claims (1)
不活性ガスの吹き込み口を炉床部鋼浴部に設け、
炉上方から炉蓋を貫通させて電極を炉内に垂下さ
せ、冷材スクラツプを充填して、溶解、精練を行
なう製鋼用電気炉において、前記吹き込み口を炉
床部鋼浴深さの２分の１以下の炉底でかつ電極真
直下方の電極径面積部を避けた位置に、複数の同
心円上に多数配置し、多数の吹き込み口を１つの
ガスホルダに連通集合させ、該１つのガスホルダ
に１つのガス管を接続して該ガス管へのガス供給
手段のさし込み口を電気炉下方から側方にずらし
たことを特徴とする製鋼用電気炉。1. Provide an inlet for oxidizing gas such as oxygen or inert gas such as Ar in the steel bath part of the hearth,
In an electric furnace for steelmaking, in which an electrode is passed through the furnace lid from above and hangs down into the furnace, and cold scrap is filled and melted and smelted, the inlet is inserted into the hearth at a depth of 2 minutes. A large number of air inlets are arranged on a plurality of concentric circles at the bottom of the furnace of 1 or less and at a position avoiding the electrode diameter area directly below the electrode, and a large number of inlets are connected and collected in one gas holder, An electric furnace for steelmaking, characterized in that one gas pipe is connected to the gas pipe, and the insertion port of a gas supply means to the gas pipe is shifted from the bottom of the electric furnace to the side.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP13632080A JPS5760011A (en) | 1980-09-30 | 1980-09-30 | Production of steel in electric furnace for steel making and its device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP13632080A JPS5760011A (en) | 1980-09-30 | 1980-09-30 | Production of steel in electric furnace for steel making and its device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5760011A JPS5760011A (en) | 1982-04-10 |
| JPS622607B2 true JPS622607B2 (en) | 1987-01-21 |
Family
ID=15172459
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP13632080A Granted JPS5760011A (en) | 1980-09-30 | 1980-09-30 | Production of steel in electric furnace for steel making and its device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5760011A (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS59183226U (en) * | 1983-05-23 | 1984-12-06 | 大木 幸夫 | Anti-fog structure of goggles |
| US5177763A (en) * | 1990-03-28 | 1993-01-05 | Kawasaki Steel Corporation | Furnace bottom structure of direct current electric furnace |
| DE4130397A1 (en) * | 1991-09-12 | 1993-03-18 | Kortec Ag | DC ELECTRIC OVEN WITH A STOVE ELECTRODE, STOVE ELECTRODE AND ELECTRODE BLOCK AND OPERATING METHOD FOR THIS OVEN |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5092807A (en) * | 1973-12-14 | 1975-07-24 | ||
| JPS50157215A (en) * | 1974-06-11 | 1975-12-19 | ||
| JPS54147108A (en) * | 1978-05-12 | 1979-11-17 | Kawasaki Steel Co | Bottom blown converter excellent in dephosphor refining performance |
| JPS54159308A (en) * | 1978-06-08 | 1979-12-17 | Kawasaki Steel Co | Oxygen bottom blowing converter |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5313761Y2 (en) * | 1973-07-13 | 1978-04-13 |
-
1980
- 1980-09-30 JP JP13632080A patent/JPS5760011A/en active Granted
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5092807A (en) * | 1973-12-14 | 1975-07-24 | ||
| JPS50157215A (en) * | 1974-06-11 | 1975-12-19 | ||
| JPS54147108A (en) * | 1978-05-12 | 1979-11-17 | Kawasaki Steel Co | Bottom blown converter excellent in dephosphor refining performance |
| JPS54159308A (en) * | 1978-06-08 | 1979-12-17 | Kawasaki Steel Co | Oxygen bottom blowing converter |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5760011A (en) | 1982-04-10 |
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