JPS6054367B2 - Melting method in arc furnace for steelmaking - Google Patents
Melting method in arc furnace for steelmakingInfo
- Publication number
- JPS6054367B2 JPS6054367B2 JP60011979A JP1197985A JPS6054367B2 JP S6054367 B2 JPS6054367 B2 JP S6054367B2 JP 60011979 A JP60011979 A JP 60011979A JP 1197985 A JP1197985 A JP 1197985A JP S6054367 B2 JPS6054367 B2 JP S6054367B2
- Authority
- JP
- Japan
- Prior art keywords
- oxygen
- furnace
- coke
- burner
- melting
- 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
- 238000002844 melting Methods 0.000 title claims description 17
- 230000008018 melting Effects 0.000 title claims description 17
- 238000000034 method Methods 0.000 title claims description 9
- 238000009628 steelmaking Methods 0.000 title claims description 5
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 20
- 239000001301 oxygen Substances 0.000 claims description 20
- 229910052760 oxygen Inorganic materials 0.000 claims description 20
- 239000000571 coke Substances 0.000 claims description 16
- 238000002485 combustion reaction Methods 0.000 claims description 16
- 229910000831 Steel Inorganic materials 0.000 claims description 10
- 239000010959 steel Substances 0.000 claims description 10
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 8
- 230000001603 reducing effect Effects 0.000 claims description 4
- 238000005255 carburizing Methods 0.000 claims description 3
- 239000000843 powder Substances 0.000 claims description 3
- 230000001737 promoting effect Effects 0.000 claims description 3
- 239000003638 chemical reducing agent Substances 0.000 claims description 2
- 239000003795 chemical substances by application Substances 0.000 claims description 2
- 239000000446 fuel Substances 0.000 description 7
- 230000000694 effects Effects 0.000 description 6
- 229910052799 carbon Inorganic materials 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 238000001816 cooling Methods 0.000 description 2
- 239000000295 fuel oil Substances 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- 239000003921 oil Substances 0.000 description 2
- 230000003647 oxidation Effects 0.000 description 2
- 238000007254 oxidation reaction Methods 0.000 description 2
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000004090 dissolution Methods 0.000 description 1
- 239000003350 kerosene Substances 0.000 description 1
- 239000000289 melt material Substances 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 238000004904 shortening Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 229910052717 sulfur Inorganic materials 0.000 description 1
- 239000011593 sulfur Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
- C21C5/52—Manufacture of steel in electric furnaces
- C21C5/5211—Manufacture of steel in electric furnaces in an alternating current [AC] electric arc furnace
- C21C5/5217—Manufacture of steel in electric furnaces in an alternating current [AC] electric arc furnace equipped with burners or devices for injecting gas, i.e. oxygen, or pulverulent materials into the furnace
-
- 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
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- 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)
Description
【発明の詳細な説明】
（産業上の利用分野）
この発明は製鋼用アーク炉において、アーク熱以外に補
助燃焼装置から給送される燃料の燃焼熱とで鋼を溶解さ
せる溶解法の改良に関する。Detailed Description of the Invention (Industrial Application Field) This invention relates to an improved melting method in which steel is melted using combustion heat of fuel fed from an auxiliary combustion device in addition to arc heat in an arc furnace for steelmaking. .
（従来の技術）従来の製鋼用アーク炉による溶解法は、
溶解期の短縮による生産性の向上、並びに電力消費の低
減を図るため、溶解期中に酸素、重油および灯油などを
炉内で直接燃焼させる補助燃焼装置を用いている。(Prior art) The conventional melting method using an arc furnace for steelmaking is
In order to improve productivity by shortening the melting period and reduce power consumption, an auxiliary combustion device is used to directly burn oxygen, heavy oil, kerosene, etc. in the furnace during the melting period.
この従来の補助燃焼装置は、第３図に示したようにアー
ク炉３１の炉壁３２に溶解促進用バーナー３３を設けて
なるものである。この種バーナー３３としては、酸素オ
イルバーナー、酸素ガスバーナー等のオイル又はガス燃
料を使用するものが専ら用いられている。また、上記従
来技術の改良として特公昭５０一８６８５号公報に開示
の発明がある。This conventional auxiliary combustion device has a burner 33 for promoting melting provided on the furnace wall 32 of an arc furnace 31, as shown in FIG. As this type of burner 33, those using oil or gas fuel, such as oxy-oil burners and oxy-gas burners, are exclusively used. Further, as an improvement on the above-mentioned prior art, there is an invention disclosed in Japanese Patent Publication No. 50-18685.
この発明は前記のような溶解促進バーナーを炉壁に配置
し、該バーナーから重油と共に高温で電離を行なう物質
、例えばに、ＳＯ。、Ｉ（、Ｃｏ、のようなシート物質
を噴出させることにより、導電性の高いプラズマを作り
アークを安定してフリッカ−を抑制しつつ溶解しようと
するのである。（発明が解決しようとする問題点）
ところで、上記の従来のいずれの溶解法においても、補
助燃焼装置を用いる問題点として、その燃料費が高価に
つき、しかも今後益々その供給が不足することが挙げら
れる。In this invention, a dissolution promoting burner as described above is disposed on the furnace wall, and a substance, such as SO, is ionized at high temperature together with heavy oil from the burner. By ejecting a sheet material such as ,I(,Co,), a highly conductive plasma is created to stabilize the arc and suppress flicker while melting.(Problem to be solved by the invention) However, in any of the conventional melting methods mentioned above, the problem with using an auxiliary combustion device is that the fuel is expensive and its supply will become increasingly scarce in the future.
又アーク炉は本来アーク熱により被溶解物を溶解するた
めに設計されたものであり、炉内容積は被溶解物が収容
できる最小限の大きさに形成され、従つてオイル又はガ
ス燃料を完全燃焼させるためには過剰酸素を供給する必
要があるが、これは炉内に酸化性雰囲気を招来するもの
となり、これがためこの種補助燃焼装置を用いる場合で
は、被溶解物の酸化が進行し、溶湯歩留の低下、更には
その品質に悪影響を及ぼす要因ともなつていたのである
。このさい後記の特公昭５０−８６８５号公報記載の発
明は、’ｊ−クを安定化して大電力の投入を容易にし、
この結果として迅速溶解並びにアーク炉操業に伴なつて
発生するフリッカ−を抑制することができたものとして
効果はあるが、依然として前記の欠点を有していたもの
である。（問題点を解決するための手段）
この発明は前記問題点を解決するものであつて、アーク
炉の炉壁に設けた溶解促進用助燃バー゛ナーの炉内先端
部のノズルから、酸素と、圧縮空気と共に圧送されてき
た粉状コークスを噴出させ、前記バーナーに供給される
酸素量を理論酸素量より減することにより、炉内の溶鋼
上に一部未燃焼状態の粉状コークスを散布し、この未燃
焼粉状コークスを溶鋼に対する加炭剤及び酸化物の還元
剤として用いながら溶解を行なおうとするものである。Furthermore, arc furnaces were originally designed to melt materials to be melted using arc heat, and the internal volume of the furnace is designed to be the minimum size that can accommodate the materials to be melted. For combustion, it is necessary to supply excess oxygen, but this creates an oxidizing atmosphere in the furnace, and as a result, when this type of auxiliary combustion device is used, the oxidation of the material to be melted progresses. This was a factor that reduced the yield of molten metal and even had a negative effect on its quality. In this case, the invention described in Japanese Patent Publication No. 50-8685, which will be described later, stabilizes the 'J-K and makes it easy to input large electric power.
As a result, although it is effective in achieving rapid melting and suppressing the flicker that occurs with arc furnace operation, it still has the above-mentioned drawbacks. (Means for Solving the Problems) The present invention solves the above-mentioned problems, and the present invention is aimed at solving the above-mentioned problems. By blowing out the coke powder that has been pumped together with compressed air and reducing the amount of oxygen supplied to the burner from the theoretical amount, the partially unburned coke powder is spread over the molten steel in the furnace. However, the aim is to perform melting while using this unburned powder coke as a carburizing agent for molten steel and as a reducing agent for oxides.
（作用）バーナーのノズルから、酸素と、圧縮空気と共
に圧送された粉状コークスは燃焼による助燃作用をなし
、一方炉内に散布された未燃焼コークス紛は、溶鋼に対
する有効な加炭作用を発揮すると同時に、下記反応式に
表わす如く酸化物の顕著な還元作用を果すものとなり、
ＦｅＯ＋Ｃ＋Ｆｅ＋ＣＯ
これが溶鋼の酸化損失を防止し、溶落炭素量を高めて、
延いては製品サルファ含有量の低下等の品質向上効果を
もたらすのである。(Function) Powdered coke pumped together with oxygen and compressed air from the burner nozzle has an auxiliary combustion effect, while unburned coke powder sprinkled inside the furnace has an effective carburizing effect on molten steel. At the same time, as shown in the reaction formula below, the oxide exhibits a remarkable reducing effect,
FeO+C+Fe+CO This prevents oxidation loss of molten steel, increases the amount of burnt-off carbon,
This in turn brings about quality improvement effects such as a reduction in product sulfur content.
なお、本炉にお−いては、溶鋼中の溶落炭素量が低い場
合では（高くする方が高品質を得る上で好都合）、バー
ナーの助燃完了後に酸素ラインを停止して、バーナーに
粉状コークスラインのみの供給を行えばよく、斯くすれ
ば、効率の高い加炭作業を実施すること，が容易である
。（実施例）
第１図、第２図は本発明方法に使用する製鋼用アーク炉
の補助燃焼装置の酸素コークスバーナーの構成１例を図
示するものである。In addition, in this furnace, when the amount of burnt-off carbon in the molten steel is low (a higher amount is better for obtaining high quality), the oxygen line is stopped after the auxiliary combustion in the burner is completed, and powder is supplied to the burner. It is sufficient to supply only the shaped coke line, and in this way, it is easy to carry out highly efficient carburization work. (Example) FIGS. 1 and 2 illustrate an example of the configuration of an oxycoke burner of an auxiliary combustion device for a steelmaking arc furnace used in the method of the present invention.
この補助燃焼！装置は、第３図に示した従来のものと同
様、アーク炉の炉壁に設けられる。第１図に示す如く、
図示省略のアーク炉内に装備されるバーナー本体１には
、粉状コークスを貯留する貯蔵槽１０から圧縮空気９に
ドラフトされこた粉状コークスが輸送管８を介して圧送
され、別路圧送される酸素と共に各々そのノズルより炉
内に噴出される。バーナー本体１は、第２図に示す如く
、先端に特殊形状のノズルチップ２″を形成した燃料通
路２が中心部に設けられ、その周囲にク上記ノズルチッ
プ２５を包囲して複数個のノズルチップ３゛を形成した
酸素通路３が設けられて構成され、中心部より噴出され
た粉状コークスは周囲からの酸素ジェット気流により高
温燃焼される。尚、バーナー本体１には、これを保護す
るためにその外周に冷却部７が設けられてあり、５，６
はその給水口および排水口を示している。又図中４は酸
素の供給口を示す。上記の如く、粉状コークスを燃料と
する酸素コークスバーナーを備えた補助燃焼装置を設け
たアーク炉は、粉状コークスの燃焼が酸素供給の下に行
なわれ、その燃焼速度、温度が高く、鉄屑等の鋼は迅速
溶解される。This auxiliary combustion! The device is mounted on the furnace wall of the arc furnace, similar to the conventional one shown in FIG. As shown in Figure 1,
Powdered coke is drafted into compressed air 9 from a storage tank 10 for storing powdered coke, and is forcedly conveyed via a transport pipe 8 to a burner body 1 installed in an arc furnace (not shown). They are injected into the furnace from their respective nozzles along with oxygen. As shown in FIG. 2, the burner body 1 has a fuel passage 2 in the center with a specially shaped nozzle tip 2'' formed at its tip, and a plurality of nozzles surrounding the nozzle tip 25. The structure includes an oxygen passage 3 in which chips 3 are formed, and the powdered coke ejected from the center is burned at high temperature by the oxygen jet stream from the surroundings. For this reason, a cooling section 7 is provided on the outer periphery of the cooling section 5, 6.
indicates its water inlet and drain outlet. Further, numeral 4 in the figure indicates an oxygen supply port. As mentioned above, an arc furnace equipped with an auxiliary combustion device equipped with an oxygen coke burner that uses powdered coke as fuel burns powdered coke in the presence of oxygen, and its combustion rate and temperature are high. Scrap steel is quickly melted.
この際バーナーに供給され・る酸素量は、理論酸素量前
後供給し、酸素供給量を調節して、供給比を減すること
により、コークの燃焼による助燃作用を保持しつつ、未
燃焼状態のコークス紛が存在し炉内の溶鋼上には一部未
燃焼状態の粉状コークスが散布される。（発明の効果）
以上の本発明の溶解法による溶解性能を、従来バーナー
を備えたもの（第３図のようなもの）と比較して、下表
に記載する。At this time, the amount of oxygen supplied to the burner is around the theoretical amount of oxygen, and by adjusting the oxygen supply amount and reducing the supply ratio, while maintaining the auxiliary combustion effect of coke combustion, Coke powder is present, and part of the unburnt powdered coke is scattered over the molten steel in the furnace. (Effects of the Invention) The melting performance of the above-described melting method of the present invention is compared with that of a conventional burner (as shown in FIG. 3) and is described in the table below.
従つて上記表から判るように、本発明によればその燃料
原価が５０％程度低減して省エネルギー化が達成される
こと、アーク炉の溶解歩留が向上すること、及び適正な
ＭＤＣ（溶落炭素量）が得られて製品品質を飛躍的に向
上させる。Therefore, as can be seen from the above table, according to the present invention, the fuel cost is reduced by about 50%, energy saving is achieved, the melting yield of the arc furnace is improved, and an appropriate MDC (burn-off) is achieved. carbon content), dramatically improving product quality.
第１図は本発明法において酸素コークスバーナーへの粉
状コークスの供給を示す概略図、第２図Ａ，ｂは本発明
て使用するバーナーの１例を示す側面断面図および正面
図、第３図は従来のアーク炉溶解方法を示す断面図であ
る。
１・・・・・・バーナー本体、２・・・・・・燃料通路
、３・・・・・酸素通路、４・・・・・・酸素供給口、
８・・・・・・輸送管、９・・・・・・圧縮空気（管）
、１０・・・・・・粉状コークス貯蔵槽。FIG. 1 is a schematic diagram showing the supply of powdered coke to an oxygen coke burner in the method of the present invention, FIGS. 2A and b are side sectional views and front views showing an example of the burner used in the present invention, and FIG. The figure is a sectional view showing a conventional arc furnace melting method. 1...Burner body, 2...Fuel passage, 3...Oxygen passage, 4...Oxygen supply port,
8...Transport pipe, 9...Compressed air (pipe)
, 10...Powdered coke storage tank.
Claims (1)
炉内先端部のノズルから、酸素と、圧縮空気と共に圧送
されてきた紛状コークスを噴出させ、前記バーナーに供
給される酸素量を理論酸素量より減ずることにより、炉
内の溶鋼上に一部未燃焼状態の紛状コークスを散布し、
この未燃焼粉状コークスを溶鋼に対する加炭剤及び酸化
物の還元剤として用いながら溶解を行なうことを特徴と
する製鋼用アーク炉における溶解法。1. From the nozzle at the tip of the auxiliary combustion burner for promoting melting installed on the furnace wall of the arc furnace, oxygen and powdered coke pumped together with compressed air are ejected, and the amount of oxygen supplied to the burner is calculated theoretically. By reducing the amount of oxygen, partially unburned coke powder is scattered on the molten steel in the furnace.
A melting method in an arc furnace for steelmaking, characterized in that melting is performed while using this unburned powder coke as a carburizing agent for molten steel and as a reducing agent for oxides.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP60011979A JPS6054367B2 (en) | 1985-01-24 | 1985-01-24 | Melting method in arc furnace for steelmaking |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP60011979A JPS6054367B2 (en) | 1985-01-24 | 1985-01-24 | Melting method in arc furnace for steelmaking |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS60174813A JPS60174813A (en) | 1985-09-09 |
| JPS6054367B2 true JPS6054367B2 (en) | 1985-11-29 |
Family
ID=11792718
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP60011979A Expired JPS6054367B2 (en) | 1985-01-24 | 1985-01-24 | Melting method in arc furnace for steelmaking |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6054367B2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5635130A (en) * | 1995-06-07 | 1997-06-03 | Berry Metal Co. | Combined oxygen blowing/fuel burner lance assembly |
| GB9519303D0 (en) * | 1995-09-21 | 1995-11-22 | Boc Group Plc | A burner |
-
1985
- 1985-01-24 JP JP60011979A patent/JPS6054367B2/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| JPS60174813A (en) | 1985-09-09 |
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