JPS62161911A - Lance for converter blowing - Google Patents
Lance for converter blowingInfo
- Publication number
- JPS62161911A JPS62161911A JP61003240A JP324086A JPS62161911A JP S62161911 A JPS62161911 A JP S62161911A JP 61003240 A JP61003240 A JP 61003240A JP 324086 A JP324086 A JP 324086A JP S62161911 A JPS62161911 A JP S62161911A
- Authority
- JP
- Japan
- Prior art keywords
- nozzle
- oxygen
- lance
- secondary combustion
- sub
- 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.)
- Granted
Links
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、転炉吹錬用ランスに係り、特に２次燃焼用の
酸素流量を調整し炉内保護をしながら効率よく２次燃焼
ができるランスに関し、転炉吹錬の分野で利用される。[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a lance for blowing in a converter furnace, and in particular, a method for efficiently performing secondary combustion while protecting the inside of the furnace by adjusting the oxygen flow rate for secondary combustion. Regarding the lance that can be used, it is used in the field of converter blowing.
転炉における炉内反応を特徴づけるものは、上吹きラン
スノズルから供給される酸素ジェットによって生じる鋼
浴の激しい撹拌と急速な反応である。高純度、高エネル
ギーの気体酸素流は火点（酸素ジェットと鋼浴の衝突面
）で脱炭反応に代表されるガス−鋼浴反応を起こさせる
と共に石灰の滓化を促し、脱りんに代表されるスラグ−
鋼浴間反応を同時に進行させる。転炉用原料の溶銑配合
率が９５％前後と高い場合は、溶銑中のＣが溶鋼温度上
昇のための熱源として十分であったが、溶銑配合率を低
下させたりスクラップや鉄鉱石の配合割合を高めると、
何らかの方法で溶鋼温度上昇のための熱源を補償する必
要が生じる。この方法としてコークス等の炭材添加法と
共に、吹錬時脱炭によって発生するＣＯガスを吹錬用と
は別の一／ズルから噴射した酸素で燃焼させ、これを鋼
浴に伝達させるいわゆる２次燃焼法がある。The in-furnace reaction in a converter is characterized by intense stirring of the steel bath and rapid reaction caused by an oxygen jet supplied from a top-blown lance nozzle. The high-purity, high-energy gaseous oxygen flow causes a gas-steel bath reaction, typically the decarburization reaction, at the fire point (the collision surface between the oxygen jet and the steel bath), and also promotes the formation of lime slag, resulting in dephosphorization. slag
The reactions between the steel baths proceed simultaneously. When the hot metal content ratio of the raw material for the converter was high, around 95%, the carbon in the hot metal was sufficient as a heat source to raise the temperature of the molten steel. When you increase
It becomes necessary to compensate for the heat source for increasing the temperature of the molten steel in some way. In addition to the addition of carbonaceous materials such as coke, this method involves burning the CO gas generated by decarburization during blowing with oxygen injected from a separate tube other than the one used for blowing, and transmitting this to the steel bath. There is a secondary combustion method.
この２次燃焼用の酸素吹込みランスとして種々提案され
ているが、その目的とするところは、従来の吹錬用酸素
噴出用主ノズルに加えて、その主ノズルの上方に２次燃
焼用酸素噴出用副ノズルを備えたものである。その代表
的なものとして、待５ＦＪ昭５３−１０２２０５が開示
されている。これは第５図（Ａ）、（Ｂ）に示す如（、
ランス２に吹錬用主ノズル４と２次燃焼用副ノズル６を
それぞれ３〜５個交互に配置し、副ノズル６は主ノズル
４の上方位置とし、いずれも中央の酸素流路８から分岐
し、また冷却水路１０をｍ、ｔた転炉吹込用ランスであ
る。Various oxygen injection lances have been proposed for secondary combustion, but their purpose is to install oxygen for secondary combustion above the main nozzle in addition to the conventional main nozzle for blowing oxygen for blowing. It is equipped with a sub-nozzle for ejection. As a representative example, Machi 5FJ 1985-102205 is disclosed. This is shown in Figures 5 (A) and (B).
Three to five main nozzles 4 for blowing and auxiliary nozzles 6 for secondary combustion are arranged alternately on the lance 2, the auxiliary nozzles 6 are positioned above the main nozzle 4, and both branch from the central oxygen flow path 8. It is also a lance for blowing into a converter with a cooling waterway 10 of m and t.
このランス２を使用する炉内２次燃焼操業は次のように
行われろ。一般に転炉炉内はほぼ大気圧に等しく、ラン
ス２の酵素供給管内圧は数〜１０数ｋｇ／ｃｔであり、
かつ主ノズル４はいわゆるラバール形状となっている乙
とから超音速で酸素が噴出する。従って鋼浴から１〜３
ｍ程度のランス高さの場合でも、鋼浴に衝突する時は、
その圧力は鋼浴上面のスラグ浴静圧よりも高く、かつ１
００ｍ／ｓ以上にも及ぶ流速を維持していることがら鋼
浴面に達し、溶鋼を撹拌し急速な脱炭反応を促進する。The in-furnace secondary combustion operation using this lance 2 is performed as follows. Generally, the pressure inside the converter furnace is approximately equal to atmospheric pressure, and the internal pressure of the enzyme supply pipe of lance 2 is several to several dozen kg/ct.
In addition, the main nozzle 4 has a so-called Laval shape, and oxygen is ejected at supersonic speed. Therefore 1-3 from the steel bath
Even if the lance height is about m, when it collides with the steel bath,
The pressure is higher than the slag bath static pressure on the top of the steel bath, and 1
Since the flow velocity is maintained at over 1,000 m/s, it reaches the surface of the steel bath, stirs the molten steel, and promotes rapid decarburization reactions.
一方、副ノズル６は主ノズル４よりも高い位置にあるこ
とと、ノズル形状をストレートとすることで音速で噴出
した酸素が鋼浴に達するエネルギーが小さいことから、
脱炭に利用するよりも主ノズル４で脱炭反応により発生
させたＣｏガスを燃焼させ、その燃焼熱を輻射もしくは
伝熱により溶鋼に伝達させるようにしている。乙のラン
ス２を使用した２次燃焼実績は、２次燃焼率が最大でも
３０％であり、その着熱効率に至っては２０％が限界で
あると報告されているが、一般に１よ燃焼効率はともか
く着熱効率は前記値より更に小さく、スクラップ配合率
で５％程度上昇させろことが実績限界である。On the other hand, since the sub nozzle 6 is located higher than the main nozzle 4 and the nozzle has a straight shape, the energy of the oxygen ejected at the speed of sound reaching the steel bath is small.
Rather than using it for decarburization, the Co gas generated by the decarburization reaction is combusted in the main nozzle 4, and the combustion heat is transferred to the molten steel by radiation or heat transfer. In the secondary combustion results using Otsu's Lance 2, the maximum secondary combustion rate is 30%, and it is reported that the heat transfer efficiency is at the limit of 20%, but in general, the combustion efficiency is higher than 1. In any case, the heat transfer efficiency is even smaller than the above value, and the actual limit is to increase the scrap mixing ratio by about 5%.
しかるに、スクラップ価格はその供給量の増大から・漸
次下落する傾向にあり、いづれは溶銑より安価になるこ
とが想定され、事実欧米では高スクラップの配合吹錬が
種々の対策のもとて実行に移されている。従ってこうし
た高スクラップの配合吹錬に応えるべく２次燃焼率の向
上および着熱効率の増加が緊急の課題となっているが、
上記の如く現状においては十分の成果を得るに至ってい
ない。However, the price of scrap is gradually decreasing due to the increase in its supply, and it is expected that it will eventually become cheaper than hot metal. It has been moved. Therefore, improving the secondary combustion rate and increasing the heat transfer efficiency have become urgent issues in order to respond to such high scrap compound blowing.
As mentioned above, at present, sufficient results have not been achieved.
本発明の目的は、上記従来技術の問題点を解決し、２次
燃焼効率および着熱効率を向上できる転炉吹錬用ランス
を提供するにある。An object of the present invention is to provide a converter blowing lance that solves the problems of the prior art described above and can improve secondary combustion efficiency and heat transfer efficiency.
〔問題点を解決するための手段および作用〕本発明の要
旨とするところは次の如くである。[Means and operations for solving the problems] The gist of the present invention is as follows.
すなわち、精錬用の主ノズルのほかに２次燃焼用の副ノ
ズルを有して成る転炉吹錬用ランスにおいて、前記副ノ
ズルは噴出流速が亜音速になる如く、先拡がり形状もし
くは内部に多孔板、流路断面変更板等のガス流抵抗体を
設けた形状また（よこれらの両者を組合せた形状であり
、前記主ノズル用酸素流路と前記副ノズル用酸素流路を
分離して設けたことを特徴とする転炉吹錬用ランスであ
る。That is, in a converter blowing lance that has a sub nozzle for secondary combustion in addition to a main nozzle for refining, the sub nozzle has a tapered shape or has a porous hole inside so that the ejection flow velocity is subsonic. The oxygen flow path for the main nozzle and the oxygen flow path for the auxiliary nozzle are provided separately. This is a lance for converter blowing that is characterized by:
本発明者らは２次燃焼によるＣｏガス燃焼熱の溶鋼への
伝達は、主に次の二つの機構によることを種々のモデル
実験により見出した。その一つは、燃焼熱が炉内でフォ
ーミングしているスラグに直接伝達されてスラグ温度が
上昇し、フォーミングスラグが下降して溶鋼と接触する
際に鋼浴−スラグ界面で熱伝達され溶鋼；温度が上昇す
る機構であり、今一つは、ＣＯ燃焼帯の発熱が直接輻射
により溶鋼またはスラグに伝達されたり、あるいは輻射
により転炉炉壁に伝達され間接的に溶鋼の温度を上昇さ
せる機構である。The present inventors have found through various model experiments that the transfer of Co gas combustion heat to molten steel by secondary combustion is mainly due to the following two mechanisms. One is that combustion heat is directly transferred to the slag forming in the furnace, raising the slag temperature, and when the forming slag descends and comes into contact with the molten steel, heat is transferred at the steel bath-slag interface, resulting in molten steel; This is a mechanism by which the temperature rises. Another mechanism is that the heat generated in the CO combustion zone is transmitted to the molten steel or slag by direct radiation, or it is transmitted to the converter wall by radiation and indirectly increases the temperature of the molten steel. .
他方、ガスの燃焼実験からは次の知見を得た。On the other hand, the following findings were obtained from gas combustion experiments.
すなわち、Ｃｏガスの燃焼速度は火炎伝播速度によって
決り、Ｃｏガスの場合この火炎伝播速度は１０ ｍ／
ｓ以下、望ましくは数ｍ／ｓＱ下である。従って２次燃
焼が生じるのは供給酸素とＣｏガスの混合域での流速が
１０ ｍ／ ｓ以下の範囲で急激に起こるので、２次燃
焼を発生せしめたい領域における酸素供給速度を前記火
炎伝播速度に制御することが必要となる。That is, the combustion speed of Co gas is determined by the flame propagation speed, and in the case of Co gas, this flame propagation speed is 10 m/
s or less, preferably several m/sQ or less. Therefore, secondary combustion occurs rapidly when the flow velocity in the mixing region of supplied oxygen and Co gas is 10 m/s or less, so the oxygen supply velocity in the region where secondary combustion is desired to occur is determined by the flame propagation velocity. It is necessary to control the
一方、前記の種々の実験から２次燃焼帯は、炉内の鋼浴
の上方のフォーミングスラグの豊富な領域であることが
望ましく、ランス高さが鋼浴面から１．５〜４．０ｍ程
度であれば、ランスのノズル噴出口から１０〜４．０ｍ
の範囲に前記火炎伝播速度となるように酸素噴出速度を
制御するのが最も効果的である。この時のノズル噴出速
度は亜音速であることが条件で望ましくは１００ｍ／Ｓ
以下である。On the other hand, from the various experiments mentioned above, it is desirable that the secondary combustion zone is an area rich in forming slag above the steel bath in the furnace, and the lance height is about 1.5 to 4.0 m from the steel bath surface. If so, 10 to 4.0 m from the lance nozzle outlet.
It is most effective to control the oxygen injection speed so that the flame propagation speed falls within the range of . The nozzle ejection speed at this time should be subsonic, preferably 100 m/s.
It is as follows.
従って本発明においては、酸素流路内圧が亜音速望まし
くは１００ ｍ／Ｓ以下の副ノズルを設けた。Therefore, in the present invention, a sub-nozzle is provided in which the internal pressure of the oxygen flow path is subsonic, preferably 100 m/s or less.
第１図に示した副ノズル６の実施例は流路断面を径ｄ、
から径ｄ２に急拡大した先拡がりの形状のものである。The embodiment of the sub-nozzle 6 shown in FIG. 1 has a flow path cross section with a diameter d,
It has a tapering shape that suddenly expands from 1 to 2 in diameter to d2.
一般に圧縮性流体では流体が亜音速の領域で先拡がりノ
ズルに流入すると圧力が上昇し流速が低下する。転炉ラ
ンス内は数〜１０数ｋｇ／ｒｅｄの圧力で酸素流速が２
００〜３００ ｍ／ｓ程度であるから、第１図に示す如
き先拡がりの副ノズル６に酸素流路から流入する場合は
、流入部では音速に近い状態になるが、ノズル流入直後
から先拡がりの影響で酸素ガスの圧力が増加し流速は減
少し始め、亜音速の噴出流速を得ることができる。Generally, in the case of a compressible fluid, when the fluid flows into a diverging nozzle in a subsonic region, the pressure increases and the flow velocity decreases. Inside the converter lance, the pressure is several to several dozen kg/red, and the oxygen flow rate is 2.
00 to 300 m/s, so when the oxygen flows from the oxygen flow path into the auxiliary nozzle 6 with a widening tip as shown in FIG. Under the influence of this, the pressure of oxygen gas increases and the flow velocity begins to decrease, making it possible to obtain a subsonic jet flow velocity.
第２図（Ａ）、（Ｂ）は先拡がり形状の副ノズル６′の
内部多孔板１２のガス流抵抗体を設けたものである。ま
た、第３図（Ａ）〜（Ｅ）は先拡がり形状の副ノズル６
の内部に互違いの流路断面変更板１°４のガス流抵抗体
を設けたものである。これらは副ノズル６の先後端が先
拡がりの形状であり、更に中央部にはガス流抵抗体を設
けであるので流速の減速効果はより著しい。FIGS. 2(A) and 2(B) show a sub-nozzle 6' having a flared tip, in which a gas flow resistor is provided in the internal porous plate 12. In addition, FIGS. 3(A) to 3(E) show the sub-nozzle 6 with a flared tip.
Gas flow resistors with alternating flow path cross-section changing plates of 1°4 are provided inside the gas flow chamber. In these cases, the front and rear ends of the sub-nozzle 6 are flared, and a gas flow resistor is provided in the center, so that the effect of reducing the flow velocity is even more remarkable.
本発明者らの実験によれば第１図において人口径ｄ、、
出口径ｄ２、拡大管部長さｌとするとｄ２／ｄ、＝ １
．１〜？、 ０１ｄ２く！く２０ｏｄ２の範囲が実用的
で効果のあることが認められた。According to the experiments conducted by the present inventors, in Fig. 1, the population diameter d,
If the outlet diameter is d2 and the length of the expanded tube is l, then d2/d, = 1
．． 1~? , 01d2ku! It was found that a range of 20 od2 is practical and effective.
また、本発明においては、主ノズル用酸素流路と副ノズ
ル用酸素流路が分離して設けられている。Further, in the present invention, the oxygen flow path for the main nozzle and the oxygen flow path for the sub nozzle are provided separately.
第４図、（Ａ）、（Ｂ）、（Ｃ）は第１図に示した先拡
がり副ノズル６を採用したランス全体を示したもので（
Ｂ）の上半分は（Ａ）のＩ−Ｉ線矢視断面図、下半分は
（Ａ）のＩＩ−ＩＩ線矢視断面図を示し、４個の吹錬用
酸素噴出用主ノズル４と４個の先拡がり２次燃焼用酸素
噴出用副ノズル６を備え、酸素流＠８は主ノズル４月と
して主ノズル用酸素流路８Ａ、主ノズル用酸素入口管座
１６、および副ノズル６用として副ノズル用酸素流路８
Ｂ、副ノズル用酸素入口管座１８が別個に設けられてい
る。Figures 4, (A), (B), and (C) show the entire lance employing the flared secondary nozzle 6 shown in Figure 1.
The upper half of B) shows a cross-sectional view taken along the line II--II of (A), and the lower half shows a cross-sectional view taken along the line II-II of (A), showing the four main nozzles 4 for blowing oxygen and Equipped with four auxiliary nozzles 6 for secondary combustion oxygen injection with a widening tip, the oxygen flow @ 8 is for the main nozzle 4, oxygen flow path 8A for the main nozzle, oxygen inlet tube seat 16 for the main nozzle, and for the auxiliary nozzle 6. Oxygen flow path 8 for sub nozzle as
B. An oxygen inlet tube seat 18 for the sub-nozzle is provided separately.
また、ランスチップおよびランス外周は従来と同様に冷
却水路１０によって炉内の熱から保護され、冷却水は給
水口管座２０、排水口管座２２によって給排水される。Further, the lance tip and the outer periphery of the lance are protected from the heat in the furnace by the cooling water channel 10 as in the conventional case, and cooling water is supplied and drained by the water inlet pipe seat 20 and the drain port pipe seat 22.
本発明においては、上記の如く先拡がり形状の２次燃焼
用副ノズル６の酸素流路８Ｂを主ノズル用酸素流路８Ａ
と別個に設けたが、これは次の２つの理由による。In the present invention, as described above, the oxygen flow path 8B of the secondary combustion sub-nozzle 6 having a flared shape is replaced with the oxygen flow path 8A for the main nozzle.
This is provided separately for the following two reasons.
第１の理由は、前記の如く２次燃焼域を形成するため副
ノズル６から酸素吐出流速を１００ ｍ／Ｓ以下にする
と、吹錬開始のランス下降時および吹錬終了のランス上
昇時の酸素供給開始時および酸素供給停止的には燃焼域
が炉上方となることが避けられず、炉口や排熱回収設備
の損傷をきたすと共に、いたずらに転炉排ガスを燃焼さ
せるだけで溶鋼昇温に寄与させることができない。本発
明では副ノズル酸素流路８Ｂを別個に設け、２次燃焼用
酸素の供給開始時期および供給停止時期を吹錬用酸素の
それより遅らせたゆ早めたりすることにより、上記の燃
焼域の上昇を防止し、炉口や排熱回収設備の損傷を防止
することができる。The first reason is that if the flow rate of oxygen discharged from the sub nozzle 6 is set to 100 m/s or less in order to form the secondary combustion zone as described above, the oxygen will be reduced when the lance descends at the start of blowing and when the lance rises at the end of blowing. When starting the oxygen supply and stopping the oxygen supply, it is unavoidable that the combustion zone will be above the furnace, causing damage to the furnace mouth and exhaust heat recovery equipment, and unnecessarily burning the converter exhaust gas, which will cause the temperature of the molten steel to rise. I can't make a contribution. In the present invention, the auxiliary nozzle oxygen flow path 8B is provided separately, and the timing of starting and stopping the supply of oxygen for secondary combustion is delayed or earlier than that of oxygen for blowing, thereby increasing the above-mentioned combustion range. It is possible to prevent damage to the furnace mouth and exhaust heat recovery equipment.
第２の理由は、従来のように第５図に示す如く吹錬用酸
素と２次燃焼用酸素を同一酸素流ＦＩｓ８から供給する
と、各々のノズルのプロフィルにより、各々のノズルか
ら噴出する酸素量比が一定である。The second reason is that when oxygen for blowing and oxygen for secondary combustion are supplied from the same oxygen flow FIs8 as shown in FIG. The ratio is constant.
しかし、実際の操業においては、脱炭期（吹錬中期）や
炉内スラグ量が増加して高着熱率が期待できる時期等の
２次燃焼用酸素量を増加させたい場合、あるいはこれと
反対に２次燃焼用酸素量を減少させたい場合があるので
、これらの炉況に対応して吹錬用酸素供給量とは別個に
２次燃焼用酸素供給量を調節するためである。However, in actual operations, there are times when it is desired to increase the amount of oxygen for secondary combustion, such as during the decarburization period (mid-blowing period), when the amount of slag in the furnace increases and a high heat transfer rate can be expected, or when it is necessary to increase the amount of oxygen for secondary combustion. On the contrary, there are cases where it is desired to reduce the amount of oxygen for secondary combustion, so the purpose is to adjust the amount of oxygen supplied for secondary combustion separately from the amount of oxygen supplied for blowing in response to these furnace conditions.
第４図に示した本発明の実施例において、主ノズル用酸
素流路８Ａの径をＤｌ、副ノズル用酸素流路８Ｂの径を
Ｄ２としＤ２／Ｄ、＝ １．２３ 、副ノズル６の仕様
ヲｄ２／ｄ、＝ １．６５．１＝２０ｄ２、副ノズル用
酸素流路８Ｂの圧力を１０ ｋｇ／ｃ＋／とじた時、副
ノズル６の先端の酸素噴出流速は約９５ ｍ／ ｓであ
った。従って主ノズル４からマツハＭ）１の超音速で酸
素が鋼浴撹拌と脱炭に供され、一方副ノズル６からは９
５ｍ／ｓ程度の亜音速の酸素が噴出され、目標位置に燃
焼帯が形成され効率よく２次燃焼を行うことができた。In the embodiment of the present invention shown in FIG. 4, the diameter of the oxygen flow path 8A for the main nozzle is Dl, the diameter of the oxygen flow path 8B for the sub nozzle is D2, D2/D, = 1.23, and the diameter of the oxygen flow path 8A for the sub nozzle 6 is D2. Specifications: d2/d, = 1.65.1 = 20d2, when the pressure in the sub-nozzle oxygen flow path 8B is 10 kg/c+/, the oxygen jet flow velocity at the tip of the sub-nozzle 6 is approximately 95 m/s. there were. Therefore, oxygen is supplied from the main nozzle 4 at a supersonic speed of Matsuha M) 1 for stirring and decarburizing the steel bath, while from the sub nozzle 6 9
Oxygen was ejected at a subsonic velocity of about 5 m/s, a combustion zone was formed at the target position, and secondary combustion could be performed efficiently.
第４図に図示の本発明の転炉上吹ランスを用い、底吹き
も０ト用して２００ｔ／ａｈ転炉で主ノズルから５００
Ｎｒｎ’／ｍｉ ｎ 、単独に設けた副ノズル用酸素
流路を介して副ノズルから１００〜１７０ Ｎｒｎ’／
ｍｉｎの酸素を吹錬による脱炭期および炉内スラグ量に
適合させて吹込み、ランス高さ３．５ｍとした時、炉内
発生ＣＯガスの２次燃焼率は３５〜４０％で、従来の１
５〜２５％増であるにもかかわらず２次燃焼帯形成域が
ランス先端から１〜ＺｍＳ鋼浴界面から上方１〜２ｍの
ほぼ理想的な領域に形成されることから、着熱効率が実
に６０〜７０％に達した。Using the converter top blowing lance of the present invention shown in FIG.
Nrn'/min, 100 to 170 Nrn'/min from the sub nozzle via the separately provided oxygen flow path for the sub nozzle.
When the lance height is set to 3.5 m, the secondary combustion rate of the CO gas generated in the furnace is 35 to 40%, compared to the conventional method. 1
Despite the increase of 5 to 25%, the secondary combustion zone is formed in an almost ideal region from the tip of the lance to 1 to 2 m above the 1 to ZmS steel bath interface, so the heat transfer efficiency is actually 60%. ~70% was reached.
その結果、転炉原料中のスクラップ比を２０％程度まで
高めることができ、従来のほぼ４倍の大量のスクラップ
を処理することができた。As a result, it was possible to increase the scrap ratio in the converter raw material to about 20%, and it was possible to process approximately four times as much scrap as in the past.
更に上記の如く２次燃焼用酸素流路を吹錬用と別個に設
けて流量＃御をすることにより、２次燃焼用酸素量を、
従来の吹錬用と２次燃焼用を同一流路から供給する場合
に比して約２０％節減することができな。Furthermore, as mentioned above, by providing an oxygen flow path for secondary combustion separately from that for blowing and controlling the flow rate, the amount of oxygen for secondary combustion can be adjusted to
Compared to the conventional case where blowing and secondary combustion are supplied from the same flow path, it is possible to save about 20%.
また、２次燃焼用酸素の供給開始時期を吹錬用酸素の供
給開始時よりランス高さで約１．５ｍ遅らせ、かつ供給
停止時期をランス高さで約１．５ｍ早めることで炉口部
をなんら損傷することなく２次燃焼を行うことができた
。In addition, by delaying the start of supply of oxygen for secondary combustion by approximately 1.5 m in lance height compared to the start of supply of oxygen for blowing, and advancing the supply stop time by approximately 1.5 m in lance height, the furnace opening Secondary combustion could be carried out without any damage.
本発明は上記実施例からも明らかな如く、副ノズルの噴
出流速が亜音速になる如（先拡がりおよび／またはガス
流体抵抗体を備えた形状の副ノズルを設け、かつランス
内部に副ノズル用２次燃焼酸素流路を独立して設け、２
次燃焼用酸素の供給量と供給時期を制御することにより
、転炉炉口部を損傷することなく、炉内発生のＧｏ燃焼
率を従来に比し１５〜２０％増加し、その上転炉装入原
料のスクラップ比を従来の４倍に増加させる画期的効果
をあげることができた。As is clear from the above embodiments, the present invention provides a sub nozzle with a shape such that the ejection flow velocity of the sub nozzle becomes subsonic (with a diverging tip and/or a gas fluid resistance element), and a sub nozzle for use in the sub nozzle inside the lance. A secondary combustion oxygen flow path is provided independently, and 2
By controlling the supply amount and supply timing of oxygen for the next combustion, the Go combustion rate generated in the furnace can be increased by 15 to 20% compared to the conventional method without damaging the converter mouth. We were able to achieve the revolutionary effect of increasing the scrap ratio of charged raw materials to four times the conventional rate.
第１図は本発明の急拡大先拡がりの副ノズルの縦断面図
、第２図（Ａ）、（Ｂ）はいずれも本発明の流体抵抗体
を設けた副ノズルを示し、（Ａ）は縦断面図、（Ｂ）は
（Ａ）のＢ−Ｂ線矢視断面図、第３図（Ａ）〜（Ｅ）は
いずれも本発明のその他の実施態様を示し、（Ａ）は縦
断面図、（Ｂ）〜（Ｅ）は（Ａ）の各部の断面図、第４
図（Ａ）、（Ｂ） 、（Ｃ）はいずれも本発明実施例の
ランスを示し、（Ａ）は全体の縦断面図、（Ｂ）の上半
分は（Ａ）のＩ−Ｉ線矢視断面図、（Ｂ）の下半分は（
Ａ）のＩｆ−Ｉｔ線矢視断面図、（Ｃ）は（Ａ）の副ノ
ズルの先拡がりの詳細を示す部分拡大断面図、第５図（
Ａ）、（Ｂ）はいずれも従来の転炉吹錬用ランスを示し
くＡ）は横断面図、（Ｂ）は（Ａ）のＢ−Ｂ折線矢視断
面図である。
２・・・吹錬用ランス ４・・吹錬用主ノズル
６・・・２次燃焼用副ノズル ８・・・酸素流路８Ａ
・・・主ノズル用酸素流路 ８Ｂ・・・副ノズル用
酸素流路１０・・・冷却水路 １２・・・多
孔板１４・・・流路断面変更板FIG. 1 is a vertical cross-sectional view of a rapidly expanding sub-nozzle of the present invention, and FIGS. 2(A) and (B) both show a sub-nozzle provided with a fluid resistance element of the present invention. 3(A) to 3(E) all show other embodiments of the present invention, and (A) is a longitudinal sectional view of FIG. Figures (B) to (E) are cross-sectional views of each part of (A).
Figures (A), (B), and (C) all show lances according to embodiments of the present invention, where (A) is a longitudinal cross-sectional view of the whole, and the upper half of (B) is a diagram taken along the line I-I in (A). The lower half of the cross-sectional view (B) is (
A) is a cross-sectional view taken along the line If-It, (C) is a partially enlarged cross-sectional view showing details of the expanding tip of the sub nozzle in (A), and FIG.
Both A) and (B) show a conventional converter blowing lance, A) is a cross-sectional view, and (B) is a cross-sectional view taken along the line BB in (A). 2...Lance for blowing 4...Main nozzle for blowing 6...Sub-nozzle for secondary combustion 8...Oxygen flow path 8A
...Oxygen channel for main nozzle 8B...Oxygen channel for sub-nozzle 10...Cooling water channel 12...Perforated plate 14...Channel cross-section changing plate
Claims (1)
を有して成る転炉吹錬用ランスにおいて、前記副ノズル
は噴出流速が亜音速になる如く先拡がり形状もしくは内
部に多孔板、流路断面変更板等のガス流抵抗体等を設け
た形状またはこれらの両者を組合せた形状であり、前記
主ノズル用酸素流路と前記副ノズル用酸素流路を分離し
て設けたことを特徴とする転炉吹錬用ランス。(1) In a converter blowing lance that has a secondary combustion nozzle in addition to the main refining nozzle, the secondary nozzle has a tapered shape or a porous interior so that the ejection flow velocity is subsonic. The oxygen flow path for the main nozzle and the oxygen flow path for the sub-nozzle are provided separately. A converter blowing lance characterized by:
Priority Applications (7)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61003240A JPS62161911A (en) | 1986-01-10 | 1986-01-10 | Lance for converter blowing |
| US06/897,524 US4746103A (en) | 1985-08-20 | 1986-08-18 | Lance for blow-refinement in converter |
| CA000516195A CA1293121C (en) | 1985-08-20 | 1986-08-18 | Lance for blow-refinement in converter |
| DE8686401842T DE3671472D1 (en) | 1985-08-20 | 1986-08-19 | LANZE TO BLOW AND FRESH IN THE CONVERTER. |
| EP86401842A EP0214902B1 (en) | 1985-08-20 | 1986-08-19 | Lance for blow-refinement in converter |
| BR8603962A BR8603962A (en) | 1985-08-20 | 1986-08-19 | BLOW FOR REFINING IN A CONVERTER |
| KR1019860006818A KR930007311B1 (en) | 1985-08-20 | 1986-08-19 | Lance for blow-refinement in converter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61003240A JPS62161911A (en) | 1986-01-10 | 1986-01-10 | Lance for converter blowing |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS62161911A true JPS62161911A (en) | 1987-07-17 |
| JPH0377248B2 JPH0377248B2 (en) | 1991-12-10 |
Family
ID=11551930
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP61003240A Granted JPS62161911A (en) | 1985-08-20 | 1986-01-10 | Lance for converter blowing |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS62161911A (en) |
-
1986
- 1986-01-10 JP JP61003240A patent/JPS62161911A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0377248B2 (en) | 1991-12-10 |
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