JPH0277514A - Method for heating iron scrap in converter - Google Patents
Method for heating iron scrap in converterInfo
- Publication number
- JPH0277514A JPH0277514A JP63227882A JP22788288A JPH0277514A JP H0277514 A JPH0277514 A JP H0277514A JP 63227882 A JP63227882 A JP 63227882A JP 22788288 A JP22788288 A JP 22788288A JP H0277514 A JPH0277514 A JP H0277514A
- Authority
- JP
- Japan
- Prior art keywords
- kerosene
- converter
- oxygen
- tuyere
- scrap iron
- 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
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 title claims abstract description 84
- 229910052742 iron Inorganic materials 0.000 title claims abstract description 42
- 238000000034 method Methods 0.000 title claims abstract description 15
- 238000010438 heat treatment Methods 0.000 title claims description 23
- 239000003350 kerosene Substances 0.000 claims abstract description 49
- 238000007664 blowing Methods 0.000 claims abstract description 25
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 21
- 239000001301 oxygen Substances 0.000 claims abstract description 21
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 21
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims abstract description 12
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims abstract description 10
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 claims abstract description 10
- 239000007789 gas Substances 0.000 claims abstract description 7
- 229910052786 argon Inorganic materials 0.000 claims abstract description 5
- 229910002092 carbon dioxide Inorganic materials 0.000 claims abstract description 5
- 239000001569 carbon dioxide Substances 0.000 claims abstract description 5
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 5
- 239000003923 scrap metal Substances 0.000 claims description 13
- 229910001873 dinitrogen Inorganic materials 0.000 claims description 2
- 239000000446 fuel Substances 0.000 claims description 2
- 239000002737 fuel gas Substances 0.000 claims description 2
- 239000000203 mixture Substances 0.000 claims 1
- 239000011261 inert gas Substances 0.000 abstract description 14
- 229910000831 Steel Inorganic materials 0.000 description 13
- 239000010959 steel Substances 0.000 description 13
- 239000002184 metal Substances 0.000 description 6
- 229910052751 metal Inorganic materials 0.000 description 6
- 238000002485 combustion reaction Methods 0.000 description 4
- 238000000889 atomisation Methods 0.000 description 3
- 239000000567 combustion gas Substances 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 238000007670 refining Methods 0.000 description 3
- MYMOFIZGZYHOMD-UHFFFAOYSA-N Dioxygen Chemical compound O=O MYMOFIZGZYHOMD-UHFFFAOYSA-N 0.000 description 2
- 230000001276 controlling effect Effects 0.000 description 2
- 229910001882 dioxygen Inorganic materials 0.000 description 2
- 238000002844 melting Methods 0.000 description 2
- 230000008018 melting Effects 0.000 description 2
- 238000003756 stirring Methods 0.000 description 2
- 241000254158 Lampyridae Species 0.000 description 1
- 239000003570 air Substances 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 239000003575 carbonaceous material Substances 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 229910052748 manganese Inorganic materials 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 229910052698 phosphorus Inorganic materials 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 238000010079 rubber tapping Methods 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000002436 steel type Substances 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
- Carbon Steel Or Casting Steel Manufacturing (AREA)
Abstract
Description
【発明の詳細な説明】
（産業上の利用分野）
本発明は、多量の屑鉄を溶解して溶鋼を製造する際、転
炉内で屑鉄を加熱する方法に関する。DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a method of heating scrap iron in a converter when melting a large amount of scrap iron to produce molten steel.
（従来の技術）
転炉を使用した鋼の溶製方法は、まず屑鉄と溶銑を転炉
に装入した後、上吹きランス及び／又は底吹き羽口から
酸素ガス、空気、酸素富化空気等を吹き込んで溶銑中の
Ｃ，Ｓｉ、Ｍｎ、Ｐ等を酸化燃焼させることによって除
去し、同時に発熱させて所定の溶鋼を溶製している。(Prior art) A steel melting method using a converter involves first charging scrap iron and hot metal into the converter, and then blowing oxygen gas, air, or oxygen-enriched air through the top blowing lance and/or bottom blowing tuyere. C, Si, Mn, P, etc. in the hot metal are removed by oxidizing and burning them, and at the same time, heat is generated to melt a predetermined molten steel.
このとき、必要最低温度が鋼種に応じて決まっており、
この温度を確保するために必要最小量の溶銑量（以下、
これを最低溶銑蛍という）が決まっている。ところが、
溶銑を製造する高炉が不調になった場合や、鋼の生産量
を増加しなければならなくなった場合等においては、装
入する屑鉄の量を多くする必要があり、その結果として
最低溶銑量が低下する。しかし、単に屑鉄の装入量を多
くしたのでは、転炉内で必要とする温度が確保されない
。At this time, the required minimum temperature is determined depending on the steel type.
The minimum amount of hot metal required to ensure this temperature (hereinafter referred to as
This is called the minimum molten metal firefly). However,
When the blast furnace that produces hot metal goes out of order, or when it is necessary to increase steel production, it is necessary to increase the amount of scrap iron charged, and as a result, the minimum amount of hot metal is reduced. descend. However, simply increasing the amount of scrap iron charged does not ensure the required temperature in the converter.
この温度を保証するため、転炉に装入された屑鉄を加熱
する方法（特開昭５７−２０７１０６号）や、炭材等の
熱源を添加する方法（特開昭６１−１９５９０９号）等
が知られている。In order to guarantee this temperature, methods such as heating the scrap iron charged in the converter (Japanese Patent Application Laid-Open No. 57-207106) and adding a heat source such as carbonaceous material (Japanese Patent Application Laid-open No. 195909-1983) are available. Are known.
屑鉄を加熱する方法として実操業で採用されているもの
としては、上吹きランスを改造して灯油バーナーとして
兼用するもの、炉底に設けた二重管胴口の外管から灯油
を噴出させ、内管からこの灯油を燃焼させるための酸素
ガス等を噴出させる方法が一般的に知られている。この
ように、屑鉄加熱用の熱源として灯油を使用するのは、
灯油の取り扱いが比較的容易であり、且つ燃焼速度が極
めて早く、屑鉄の短時間加熱が容易に行われることがあ
げられる。すなわち、短時間で屑鉄を高温に加熱するこ
とは、転炉等の主要生産設備にとって生産能力向上の面
から極めて重要なものである。Methods used in actual operations to heat scrap iron include modifying the top blowing lance to double as a kerosene burner, jetting kerosene from the outer tube of the double-tube body opening installed at the bottom of the furnace, and A generally known method is to blow out oxygen gas or the like to burn this kerosene from the inner tube. In this way, using kerosene as a heat source for heating scrap metal is
Kerosene is relatively easy to handle, has an extremely fast combustion rate, and can easily heat scrap metal for a short period of time. That is, heating scrap iron to a high temperature in a short time is extremely important in terms of improving production capacity of major production equipment such as converters.
（発明が解決しようとする課題）
ところが転炉の型式には炉底に数本の二重管胴口を有す
る所謂ＬＤ−ＯＢと炉底に内径が３〜４■の細い鋼管を
２０〜４０本集合した数本のプラグを有する所謂ＬＤ−
ＣＢがあり、この両者が多く使用されている。一般に大
型転炉には、羽目からのガス吹込量が多く、そのため溶
鋼撹拌力の大きいＬ Ｄ −ＯＢが採用され、中小型転
炉にはＬＤ−ＣＢが採用される傾向にある。(Problem to be solved by the invention) However, the type of converter is the so-called LD-OB, which has several double tube openings at the bottom of the furnace, and 20 to 40 thin steel tubes with an inner diameter of 3 to 4 cm at the bottom of the furnace. The so-called LD- has several plugs assembled together.
There is CB, and both are widely used. In general, large converters tend to use LD-OB, which has a large amount of gas blown through the siding, and therefore have a large molten steel stirring power, and LD-CB tends to be used in small and medium-sized converters.
ＬＤ−ＣＢは細管集合羽口であり、該細管から、ＣＯ＊
、 Ａ ｒ 、 Ｎ ｘ等の不活性ガスを吹込むことに
より、吹錬中溶鋼を撹拌し精錬を促進させている。LD-CB is a capillary collecting tuyere, and from the capillary, CO*
By blowing inert gas such as , Ar, Nx, etc., the molten steel is stirred during blowing and the refining is promoted.
しかしながら転炉内に装入された屑鉄を加熱する場合、
ＬＤ−ＯＢの場合の如く２重管の内管より酸素を噴出し
、外管と内管の隙間より灯油を噴出させて燃焼させ、高
温の燃焼ガスが装入された屑鉄間を上昇する過程で該屑
鉄を加熱するのと異なり、ＬＤ−ＣＢは単管構造である
ので酸素を噴］３
出させると鋼管羽口を燃焼溶呟させ、使用に耐えなくな
る。However, when heating scrap iron charged in a converter,
As in the case of LD-OB, oxygen is ejected from the inner pipe of a double pipe, kerosene is ejected from the gap between the outer pipe and the inner pipe and combusted, and the high temperature combustion gas rises between the charged scrap metal. Unlike heating the scrap iron, the LD-CB has a single-tube structure, so if it blows out oxygen, the steel pipe tuyere will burn and melt, making it unusable.
このためＬＤ−ＣＢの羽目からは燃料ガスあるいは灯油
のみを噴出することになるが、ガス状燃料の場合には細
管羽口の合計開孔断面積で制限され、時間当たりの供給
熱量が小さくそのため加熱時間が長くなる欠点を有して
いる。For this reason, only fuel gas or kerosene is ejected from the LD-CB, but in the case of gaseous fuel, it is limited by the total cross-sectional area of the tube tuyeres, and the amount of heat supplied per hour is small. It has the disadvantage that heating time is long.
一方灯油を噴出する場合、羽口からの酸素が無いため、
灯油の霧化は起こらず灯油が液体のまま炉底に滞留する
ことになる。この場合も屑鉄を効率良く加熱することは
不可能である。On the other hand, when kerosene is spouted, there is no oxygen from the tuyeres, so
Atomization of the kerosene does not occur, and the kerosene remains as a liquid at the bottom of the furnace. In this case as well, it is impossible to efficiently heat the scrap iron.
（課題を解決するための手段）
本発明の転炉内屑鉄加熱方法は、屑鉄が装入された転炉
の炉底に設置された細管集合羽口から灯油を噴出させる
と同時に上吹ランスから酸素を噴出させて、灯油を炉底
近傍で燃焼させ、該羽口の上方に予め装入された屑鉄を
加熱する方法である。(Means for Solving the Problems) The method for heating scrap iron in a converter according to the present invention is such that kerosene is spouted from the top blowing lance at the same time from the thin tube collection tuyeres installed at the bottom of the converter into which scrap iron is charged. This is a method of blowing out oxygen and burning kerosene near the bottom of the furnace to heat scrap iron that has been charged in advance above the tuyere.
又、該羽口から噴出する灯油の燃焼を促進させるため、
該灯油を一定流量に流量制御すると同時に窒素あるいは
アルゴンあるいは二酸化炭素ガスを一定圧力に圧力制御
をして噴出させることを特徴とする。In addition, in order to promote the combustion of kerosene spouted from the tuyeres,
It is characterized by controlling the flow rate of the kerosene to a constant flow rate and at the same time controlling the pressure to a constant pressure of nitrogen, argon, or carbon dioxide gas to eject it.
（作 用）
本発明の屑鉄加熱方法は、従来より屑鉄加熱が不可能と
考えられていたＬＤ−ＣＢ型転炉において、ＬＤ−ＣＢ
用細管集合羽口より灯油を噴出させると同時に上吹ラン
スから酸素を噴出させ、予め装入された屑鉄の下部、即
ち転炉炉底近傍で灯油を燃焼させ、これによって発生す
る高温燃焼ガスが屑鉄間を上昇する過程で該屑鉄を加熱
させる方法である。(Function) The scrap iron heating method of the present invention can be used in an LD-CB type converter, which has conventionally been considered impossible to heat scrap iron.
At the same time as kerosene is spouted from the tuyeres, oxygen is spouted from the top blowing lance, and the kerosene is combusted under the previously charged scrap metal, near the bottom of the converter, and the high-temperature combustion gas generated by this is This method heats the scrap iron as it moves up through the scrap metal.
ここで最重要ポイントは噴出された灯油を速やかに炉底
近傍で燃焼させることである。The most important point here is to quickly burn the jetted kerosene near the bottom of the furnace.
叩ち上吹ランスから噴出する酸素で予め装入された屑鉄
間の隙間を通過させて炉底羽口から噴出された灯油を炉
底近傍で燃焼させることである。Oxygen ejected from the knock-up lance is passed through the gap between the scrap metal charged in advance, and the kerosene ejected from the hearth bottom tuyeres is burned near the hearth bottom.
このため、上吹ランス高さは屑鉄上面から２〜４ｍ上方
と比較的低く設定し、噴出酸素の流速を高めて屑鉄間の
隙間を通過させる様にする。又、灯油の燃焼を促進させ
るため羽口から灯油を吹込むと同時に窒素、アルゴン、
炭酸ガス等の不活性ガスを吹込み、灯油を羽口直上で霧
化し急速に燃焼させる様にする。For this reason, the height of the top blowing lance is set relatively low, 2 to 4 meters above the top surface of the scrap metal, so that the flow rate of the blown oxygen is increased to allow it to pass through the gaps between the scrap metal pieces. In addition, to accelerate the combustion of kerosene, nitrogen, argon,
Inert gas such as carbon dioxide is injected to atomize the kerosene directly above the tuyere and cause it to burn rapidly.
以下図面を参照しながら本発明を具体的に説明する。The present invention will be specifically described below with reference to the drawings.
第１図は本発明のＬＤ−ＣＢ型転炉における屑鉄加熱方
法を概略的に示す断面図である。FIG. 1 is a cross-sectional view schematically showing a scrap iron heating method in an LD-CB type converter according to the present invention.
上底吹転炉１の炉底に設置された細管集合羽口２には灯
油を一定流量で供給する流量制御弁３と灯油と同時に吹
込み灯油を霧化するための不活性ガスを一定圧力で吹込
む圧力制御弁４を備えている。A thin tube collecting tuyere 2 installed at the bottom of the top-bottom blowing converter 1 has a flow control valve 3 that supplies kerosene at a constant flow rate, and an inert gas at a constant pressure to atomize the kerosene that is blown in at the same time as the kerosene. It is equipped with a pressure control valve 4 that blows in air.
転炉１の上方からは灯油を燃焼するための酸素を供給す
る上下昇降可能な上吹ランス５を有している。From above the converter 1 has a top blowing lance 5 that can be raised and lowered to supply oxygen for burning kerosene.
転炉！内には予め屑鉄６を装入する。屑鉄６は第１図の
如く羽口２の上部に積層されており、屑鉄間には大きな
空隙を形成している。Converter! Scrap iron 6 is charged in advance. The scrap iron 6 is stacked on top of the tuyere 2 as shown in FIG. 1, and large gaps are formed between the scrap iron.
先づ屑鉄６の加熱に先立ち羽口２から灯油と灯油を霧化
する不活性ガスを夫々弁３、弁４から調整しながら吹込
む。First, prior to heating the scrap iron 6, kerosene and an inert gas for atomizing the kerosene are blown into the tuyere 2 through valves 3 and 4 while being regulated.
第２図は羽口２の詳細図である。FIG. 2 is a detailed view of the tuyere 2.
灯油Ｏ１と不活性ガスＧｌは炉底配管内で混合され羽口
２に導入され羽口２内の細管２−１から高速で噴出され
る。Kerosene O1 and inert gas Gl are mixed in the furnace bottom pipe, introduced into the tuyere 2, and ejected from the thin tube 2-1 in the tuyere 2 at high speed.
灯油霧化用の不活性ガスＧｌは羽口２の入口！−２では
３〜７ Ｋｇ／ｃｍ”の圧力で導入されるが細管２−１
の出口２−２では瞬時に大気中に放出されるため急激に
膨張し、同時に導入された灯油を飛散霧化することにな
る。Inert gas Gl for kerosene atomization is at the entrance of tuyere 2! -2, it is introduced at a pressure of 3 to 7 Kg/cm'', but the tube 2-1
At the outlet 2-2, the kerosene is instantly released into the atmosphere, so it expands rapidly, and the kerosene introduced at the same time is scattered and atomized.
このように霧化された灯油は極めて急速な燃焼が可能と
なるが積層された屑鉄の底部にあるため、酸素あるいは
空気等の助燃ガスが存在せず灯油は燃焼出来ない。Kerosene that has been atomized in this manner can be burned extremely rapidly, but since it is located at the bottom of the stack of scrap metal, there is no auxiliary combustion gas such as oxygen or air, and the kerosene cannot be burned.
灯油を燃焼させるため上吹ランス５を比較的低く下げて
酸素を噴出させ屑鉄６間の間隙を通過させ羽口２の直上
部で燃焼させる様にする。燃焼した高温ガスは上吹酸素
が下降する場所の周囲から屑鉄６の間隙を上昇し屑鉄を
加熱することになる。In order to burn the kerosene, the top blowing lance 5 is lowered relatively low to blow out oxygen, passing through the gap between the scrap iron 6 and burning it right above the tuyere 2. The combusted high-temperature gas rises through the gap between the scrap iron 6 from around the area where the top-blown oxygen descends and heats the scrap iron.
この際羽口から噴出する灯油を流量制御し、霧化用の不
活性ガスを一定圧力に圧力制御することが重要である。At this time, it is important to control the flow rate of the kerosene ejected from the tuyere and to control the pressure of the inert gas for atomization to a constant pressure.
その理由を説明する。Let me explain the reason.
ＬＤ−ＣＢ用羽口は溶鋼の精錬中、細管を通して主にア
ルゴン、炭酸ガス等の不活性ガスを噴出しており転炉内
鋼浴の撹拌を促進して鋼の精錬を改善している。During the refining of molten steel, the LD-CB tuyeres mainly eject inert gases such as argon and carbon dioxide gas through thin tubes, promoting stirring of the steel bath in the converter and improving the refining of steel.
羽口２の先端２−２から噴出した不活性ガスは羽口２の
直上面の溶鋼を吸熱凝固させ、細管先端を閉塞する。こ
の閉塞率は５０〜８０％にも及ぶ。The inert gas ejected from the tip 2-2 of the tuyere 2 endothermically solidifies the molten steel directly above the tuyere 2, thereby closing the tip of the thin tube. This occlusion rate ranges from 50 to 80%.
即ち換言すれば細管全開孔断面積の２０〜５０％しか開
孔していないということを表している。In other words, this means that only 20 to 50% of the total cross-sectional area of the capillary tube is open.
このような羽口の特性から考え、屑鉄を一定時間に一定
温度になるように加熱するため羽口の開孔率が大巾に低
下しても熱源である灯油は一定流量に制御されなければ
ならない。又羽口から噴出する灯油の圧力は燃焼ゾーン
を一定域に保持し、屑鉄加熱効率を一定に保つ上で重要
である。Considering these characteristics of the tuyeres, the kerosene that is the heat source must be controlled at a constant flow rate even if the tuyere's porosity decreases significantly in order to heat the scrap iron to a constant temperature over a certain period of time. It won't happen. In addition, the pressure of the kerosene jetted from the tuyere is important in keeping the combustion zone within a constant range and keeping the scrap iron heating efficiency constant.
この理由により不活性ガスを一定圧力に保持することが
重要なのである。For this reason it is important to maintain the inert gas at a constant pressure.
このようにした従来屑鉄の加熱用としては不可能と考え
られていたＬＤ−ＣＢ型転炉においても、上吹ランスの
高さを適切にし、又羽口から噴出させる灯油を不活性ガ
スを併用して霧化することによって屑鉄加熱用としてす
ぐれた転炉として利用出来るようになった。Even in the LD-CB type converter, which was previously thought to be impossible for heating scrap metal, the height of the top blowing lance was adjusted to an appropriate height, and the kerosene spouted from the tuyere was combined with inert gas. By atomizing it, it became possible to use it as an excellent converter for heating scrap metal.
（実 施 例）
面チャージを出鋼後直ちに屑鉄を４０を装入し、３ｍｓ
径の細管を３５本有する細管集合羽口を３羽口使用して
１７０を上底吹転炉で加熱を行った。(Example) Immediately after tapping the surface charge, 40 pieces of scrap iron are charged, and the
170 was heated in a top-bottom blowing converter using three tuyeres of a collection of thin tubes each having a diameter of 35.
にｇ／ｃｍ”に一定圧力制御とした。又、上吹ランスか
らの酸素はＩ Ｏ０００Ｎｍ’／Ｈとしランス高さは屑
鉄上面より３ｍとした。The pressure was controlled to be constant at 1 g/cm''.The oxygen from the top blowing lance was IO000Nm'/H, and the height of the lance was 3 m from the top surface of the scrap iron.
この場合窒素ガスの流量は加熱のチャージ毎に変化し３
０〜５０ Ｎｍ’／Ｈであった。In this case, the flow rate of nitrogen gas changes with each heating charge.
It was 0 to 50 Nm'/H.
この条件で、１０分間加熱すると屑鉄温度は６００℃と
なった。この屑鉄加熱温度は実測する方法がないので、
この加熱後の吹錬吹止め時の溶鋼温度からの推定計算に
よるものである。When heated for 10 minutes under these conditions, the scrap iron temperature reached 600°C. There is no way to actually measure this scrap iron heating temperature, so
This is based on an estimated calculation from the molten steel temperature at the end of blowing after heating.
この場合、灯油の発熱１に対する熱効率は３８％であり
、従来の２重管羽口を有する転炉での屑鉄加熱の方法に
よる熱効率と大差なかった。In this case, the thermal efficiency with respect to the heat generated by kerosene was 38%, which was not much different from the thermal efficiency obtained by the conventional method of heating scrap iron in a converter having double tube tuyeres.
（発明の効果）
以上に説明したように、本発明においては従来不可能と
されていた細単管集合羽口を有するＬＤ−ＣＢ型上底吹
転炉においても屑鉄の灯油加熱が可能となり屑鉄の多量
使用が可能となった。またこの加熱の実現により、同一
炉での機能が拡大できた。(Effects of the Invention) As explained above, in the present invention, scrap iron can be heated with kerosene even in an LD-CB type top-bottom blowing converter having a thin single-tube collective tuyere, which was previously considered impossible. It became possible to use large quantities of. Also, by realizing this heating, the functions of the same furnace could be expanded.
第１図は本発明によるＬＤ−ＣＢ型上底吹転炉での屑鉄
加熱の断面図、第２図はＬＤ−ＣＢ型上底吹転炉の炉底
に設置されている羽口の断面図を示す。
！・・・・・・転炉
２・・・・・・羽口
３・・・・・・灯油用流調弁
４・・・・・・不活性ガス用圧調弁
５・・・・・・上吹ランス
６・・・・・・屑鉄
２−１・・・・細管
１−２・・・・羽口入口
２−２・・・・細管出口Fig. 1 is a cross-sectional view of scrap metal heating in the LD-CB type top-bottom blowing converter according to the present invention, and Fig. 2 is a cross-sectional view of the tuyere installed at the bottom of the LD-CB type top-bottom blowing converter. shows. ! ...Converter 2 ... Tuyere 3 ... Kerosene flow control valve 4 ... Inert gas pressure control valve 5 ... Top blowing lance 6... Scrap iron 2-1... Thin tube 1-2... Tuyere inlet 2-2... Thin tube outlet
Claims (2)
合羽口から燃料ガスあるいは灯油を噴出させ、同時に上
吹ランスから酸素あるいは酸素を主体とした空気あるい
は窒素との混合ガスを噴出させて上記燃料を燃焼させる
ことを特徴とする転炉内屑鉄加熱法。(1) Fuel gas or kerosene is ejected from the narrow tube tuyeres installed at the bottom of the converter into which scrap iron is charged, and at the same time, oxygen or a mixture of oxygen or oxygen-based air or nitrogen gas is ejected from the top blowing lance. A method for heating scrap iron in a converter, characterized in that the above-mentioned fuel is combusted by ejecting it.
流量制御し、同時に窒素あるいはアルゴンあるいは、二
酸化炭素ガスを一定圧力に圧力制御をして噴出させるこ
とを特徴とする請求項１記載の転炉内屑鉄加熱法(2) The method according to claim 1, characterized in that the kerosene jetted out from the narrow tube collection tuyere is controlled to have a constant flow rate, and at the same time nitrogen, argon, or carbon dioxide gas is pressure-controlled to be jetted out to a constant pressure. Scrap metal heating method in converter
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63227882A JPH0277514A (en) | 1988-09-12 | 1988-09-12 | Method for heating iron scrap in converter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63227882A JPH0277514A (en) | 1988-09-12 | 1988-09-12 | Method for heating iron scrap in converter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0277514A true JPH0277514A (en) | 1990-03-16 |
Family
ID=16867819
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP63227882A Pending JPH0277514A (en) | 1988-09-12 | 1988-09-12 | Method for heating iron scrap in converter |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0277514A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103571992A (en) * | 2012-08-02 | 2014-02-12 | 西林钢铁集团有限公司 | One with two argon-blowing gas supply method at converter bottom |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS62253708A (en) * | 1986-03-08 | 1987-11-05 | クレックナー ツェーエルアー パテント ゲゼルシャフト ミット ベシュレンクテル ハフツング | Scrap steel-making method |
-
1988
- 1988-09-12 JP JP63227882A patent/JPH0277514A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS62253708A (en) * | 1986-03-08 | 1987-11-05 | クレックナー ツェーエルアー パテント ゲゼルシャフト ミット ベシュレンクテル ハフツング | Scrap steel-making method |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103571992A (en) * | 2012-08-02 | 2014-02-12 | 西林钢铁集团有限公司 | One with two argon-blowing gas supply method at converter bottom |
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