JPH0377247B2 - - Google Patents
Info
- Publication number
- JPH0377247B2 JPH0377247B2 JP18248785A JP18248785A JPH0377247B2 JP H0377247 B2 JPH0377247 B2 JP H0377247B2 JP 18248785 A JP18248785 A JP 18248785A JP 18248785 A JP18248785 A JP 18248785A JP H0377247 B2 JPH0377247 B2 JP H0377247B2
- Authority
- JP
- Japan
- Prior art keywords
- nozzle
- lance
- blowing
- converter
- 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.)
- Expired - Lifetime
Links
- 238000007664 blowing Methods 0.000 claims description 25
- 238000007670 refining Methods 0.000 claims description 2
- 238000002485 combustion reaction Methods 0.000 description 27
- 229910000831 Steel Inorganic materials 0.000 description 23
- 239000010959 steel Substances 0.000 description 23
- 239000007789 gas Substances 0.000 description 14
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 13
- 229910052760 oxygen Inorganic materials 0.000 description 13
- 239000001301 oxygen Substances 0.000 description 13
- 239000002893 slag Substances 0.000 description 8
- 238000006243 chemical reaction Methods 0.000 description 7
- 238000012546 transfer Methods 0.000 description 7
- 238000005261 decarburization Methods 0.000 description 5
- 238000002474 experimental method Methods 0.000 description 5
- 238000002347 injection Methods 0.000 description 5
- 239000007924 injection Substances 0.000 description 5
- 239000000498 cooling water Substances 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 239000012530 fluid Substances 0.000 description 3
- 230000007246 mechanism Effects 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- 230000005855 radiation Effects 0.000 description 3
- 239000002994 raw material Substances 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 2
- 238000007796 conventional method Methods 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000003756 stirring Methods 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 235000008733 Citrus aurantifolia Nutrition 0.000 description 1
- 235000011941 Tilia x europaea Nutrition 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 239000003575 carbonaceous material Substances 0.000 description 1
- 239000000571 coke Substances 0.000 description 1
- 238000009841 combustion method Methods 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000004571 lime Substances 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 238000012549 training Methods 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
- C21C5/28—Manufacture of steel in the converter
- C21C5/42—Constructional features of converters
- C21C5/46—Details or accessories
- C21C5/4606—Lances or injectors
-
- 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)
- Carbon Steel Or Casting Steel Manufacturing (AREA)
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
焼を行い熱効率を向上できる副ノズルを備えた吹
錬用ランスに関し、転炉吹錬の分野で利用され
る。[Detailed Description of the Invention] [Industrial Field of Application] The present invention relates to a lance for blowing in a converter furnace, and particularly to a lance for blowing in a converter furnace equipped with a sub nozzle that can perform secondary combustion and improve thermal efficiency. Used in the field of training.
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エツトに
よつ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
（酸素ジエツトと鋼浴の衝突面）で脱炭反応に代
表されるガス一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つたが、溶
銑配合率を低下させたりスクラツプや鉄鉱石の配
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
炭によつて発生するCOガスを吹錬用とは別のノ
ズルから噴射したO2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 flash point (the collision surface between the oxygen jet and the steel bath), and also promotes the formation of lime slag, resulting in dephosphorization. The slag-steel bath reaction proceeds 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 molten steel. When increasing the temperature, 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 O 2 injected from a different nozzle than the one used for blowing, and transmitting it to the steel bath. There is a secondary combustion method.
この２次燃焼用のO2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O2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O2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、特
開昭53−102205が開示されている。これは第５図
Ａ，Ｂに示す如く、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経路８から分岐し、また
冷却水路１０を備えた転炉吹込用ランスである。 Various O 2 injection lances have been proposed for this secondary combustion, but their purpose is to install a secondary combustion lance above the main nozzle in addition to the conventional main nozzle for blowing O 2 injection. It is equipped with an auxiliary nozzle for ejecting O 2 . A representative example thereof is disclosed in Japanese Patent Application Laid-Open No. 102205/1983. As shown in Fig. 5A and B, the main nozzle 4 for blowing is attached to the lance 2.
and 3 to 5 sub nozzles 6 for secondary combustion are arranged alternately, the sub nozzles 6 are located above the main nozzle 4, and both branch from the central oxygen path 8, and are equipped with a cooling water passage 10. This is a lance for blowing into a furnace.
このランス２を使用する炉内２次燃焼操業は次
のように行われる。一般に転炉炉内はほぼ大気圧
に等しく、ランス２の酸素供給管内圧は数〜十数
Kg／cm2であり、かつ主ノズル４はいわゆるラバー
ル形状となつていることから超音波でO2が噴出
する。従つて鋼浴から１〜３ｍ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100ｍ／
ｓ以上にも及ぶ流速を維持していることから鋼浴
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 almost equal to atmospheric pressure, and the pressure inside the oxygen supply pipe of lance 2 is several to several dozen.
Kg/cm 2 , and since the main nozzle 4 has a so-called Laval shape, O 2 is ejected by ultrasonic waves. Therefore, even if the lance is at a height of 1 to 3 m from the steel bath, when it collides with the steel bath, the pressure will be higher than the static pressure of the slag bath on the top of the steel bath, and the lance will be 100m/
Since the flow rate is maintained at a flow rate of more than 200 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O2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。このランス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、その着熱効率に至つては20％が限界
であると報告されているが、一般には燃焼効率は
ともかく着熱効率は前記値より更に小さく、スク
ラツプ配合率で５％程度上昇させることが実績限
界である。 On the other hand, since the sub nozzle 6 is located higher than the main nozzle 4 and has a straight nozzle shape, the energy of the O 2 ejected at the speed of sound reaching the steel bath is small, so it is better to use it for decarburization. CO gas generated by the decarburization reaction is combusted in the main nozzle 4, and the combustion heat is transmitted to the molten steel by radiation or heat transfer. The results of secondary combustion using this lance 2 show that even if the secondary combustion rate is maximum,
30%, and it has been reported that the limit for heat transfer efficiency is 20%, but in general, regardless of combustion efficiency, heat transfer efficiency is even lower than the above value, and it is necessary to increase the scrap content ratio by about 5%. is the actual limit.
しかるに、スクラツ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
ラツプの配合吹錬が種々の対策のもとで実行に移
されている。従つてこうした高スクラツプの配合
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つているが、上記の如
く現状においては十分の成果を得るに至つていな
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. has been done. Therefore, there is an urgent need to improve the secondary combustion rate and increase the heat transfer efficiency in order to meet the demand for high scrap compound blowing, but as described above, sufficient results have not yet been achieved at present.
本発明の目的は、上記従来技術の問題点を解決
し、２次燃焼率および着熱効率を向上できる２次
燃焼用副ノズルを備えた吹錬用ランスを提供する
にある。
An object of the present invention is to provide a blowing lance equipped with a secondary combustion sub-nozzle that can solve the problems of the prior art described above and improve the secondary combustion rate and heat transfer efficiency.
本発明の要旨とするところは次の如くである。
すなわち、精錬用の主ノズルと共に副ノズルを備
えた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はこれらの両者を組合せた形
状であることを特徴とする転炉吹錬用ランスであ
る。
The gist of the present invention is as follows.
That is, in a converter blowing lance that is equipped with a main nozzle for refining and a subnozzle, the subnozzle has a tapered shape so that the ejection flow velocity is subsonic, or has a gas inlet such as a perforated plate or a flow path cross-section changing plate inside. This is a converter blowing lance characterized by having a shape that is provided with a flow resistance element or a shape that is a combination of both.
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、
燃焼熱が炉内でフオ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、フオーミング
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 inventors have found through various model experiments that the transfer of CO gas combustion heat to molten steel through secondary combustion is mainly due to the following two mechanisms. One of them is
A mechanism in which 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 molten steel, heat is transferred at the steel bath-slag interface, raising the molten steel temperature. Another mechanism is that the heat generated in the CO combustion zone is transferred to the molten steel or slag by direct radiation, or is transferred to the converter wall by radiation, thereby indirectly increasing 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。
すなわち、COガスの燃焼速度は火炎伝播速度に
よつて決り、COガスの場合この火炎伝播速度は
10ｍ／ｓ以下、望ましくは数ｍ／ｓ以下である。
従つて２次燃焼が生じるのは供給O2とCOガスの
混合域での流速が10ｍ／ｓ以下の範囲で急激に起
るので、２次燃焼を発生せしめたい領域における
O2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。 On the other hand, the following findings were obtained from gas combustion experiments.
In other words, 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
The speed is 10 m/s or less, preferably several m/s or less.
Therefore, secondary combustion occurs rapidly when the flow velocity in the mixing area of the supplied O 2 and CO gas is less than 10 m/s, so
It is necessary to control the O 2 supply rate to the flame propagation rate.
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オ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1.0〜4.0ｍの範囲に前記火炎伝播速度とな
るようにO2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 even if the lance height is about 1.5 to 4.0 m from the steel bath surface. For example, it is most effective to control the O 2 jetting speed so that the flame propagation speed is within a range of 1.0 to 4.0 m from the nozzle jetting port of the lance. The nozzle ejection speed at this time must be subsonic, and is preferably 100 m/s or less.
従つて本発明においては、酸素経路内圧が数〜
10Kg／cm2の転炉内上吹ランスに噴出流速が亜音速
望ましくは100ｍ／ｓ以下の副ノズルを設けた。 Therefore, in the present invention, the oxygen path internal pressure is several to
An auxiliary nozzle with an ejection flow velocity of subsonic speed, preferably 100 m/s or less was installed in the top blowing lance in the converter of 10 kg/cm 2 .
次に本発明の詳細を図示の実施例により説明す
る。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／cm2の圧力
でO2流速が200〜300ｍ／ｓ程度であるから、第
１図Ａ，Ｂ，Ｃ，Ｄに示す如き先拡がりの副ノズ
ル６に酸素経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O2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。 Next, details of the present invention will be explained with reference to illustrated embodiments. 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. Since the inside of the converter lance has a pressure of several to several tens of kg/cm 2 and an O 2 flow rate of about 200 to 300 m/s, the auxiliary nozzle 6 with a widening tip as shown in Fig. 1 A, B, C, and D is used. When flowing in from the oxygen path, the state is close to sonic speed at the inlet part, but immediately after the nozzle enters, the pressure of O 2 gas increases due to the influence of tip expansion, and the flow velocity begins to decrease, resulting in a subsonic jet flow velocity. I can do it.
酸素経路８から分岐する本発明による副ノズル
６の亜音速の噴出流速を得る先拡がりの態様は第
１図Ａ，Ｂ，Ｃ，Ｄのいずれでもよいが、更にス
トレート管の内部に多孔板や流路断面変更板を設
けたもの、もしくは第１図Ａ，Ｂ，Ｃ，Ｄの内部
に多孔板や流路断面変更板を設けた構成としてよ
く、いずれの場合も酸素経路８の200〜300ｍ／ｓ
の流速を減速して100ｍ／ｓ以下の亜音速とする
ことができる。第１Ｂ図Ａ，Ｂは第１図Ｂの場合
の先拡がり副ノズル６を採用した本発明の転炉吹
錬用ランスの実施例を示す断面図である。この場
合、先拡がり副ノズル６の設置位置は酸素経路８
内ならば任意の位置でよく特に限定の要はない。 The sub-nozzle 6 according to the present invention branching from the oxygen path 8 may have any of the configurations shown in FIG. A configuration may be provided in which a plate for changing the cross section of the flow path is provided, or a perforated plate or a plate for changing the cross section of the flow path may be provided inside the structure shown in FIGS. 1A, B, C, and D. /s
The flow velocity can be reduced to a subsonic velocity of 100 m/s or less. FIGS. 1B A and 1B are cross-sectional views showing an embodiment of the converter blowing lance of the present invention employing the flared sub nozzle 6 in the case of FIG. 1B. In this case, the installation position of the expanding sub-nozzle 6 is the oxygen path 8.
It may be placed at any position within the range, and there is no need for any particular limitation.
第２図Ａ，Ｂは先拡がり形状の副ノズル６の内
部に多孔板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１４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てあるので流速の減速効
果はより著しい。 In FIGS. 2A and 2B, a gas flow resistor of a perforated plate 12 is provided inside the sub-nozzle 6 having a flared shape. Further, FIGS. 3A to 3E show gas flow resistors of alternating flow path cross-section changing plates 14 provided inside the sub-nozzle 6 having a flared tip shape. In these, 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３図Ａにおいて
入口径：d1、途中径：d2、出口径：d3、ノズ全
長：ｌとするとd2／d1＝1.1〜10.0、d3／d1＝1.1
〜20.0、d3＜ｌ＜200d3の範囲が実用的で効果の
あることが認められた。 According to experiments by the present inventors, in Fig. 3A, inlet diameter: d 1 , intermediate diameter: d 2 , outlet diameter: d 3 , total nozzle length: 1, then d 2 /d 1 =1.1 to 10.0, d 3 / d1 =1.1
~20.0, d3 <l< 200d3 was found to be practical and effective.
第４図Ａ，Ｂは第３図Ａ〜Ｅに示す副ノズル６
を２次燃焼用副ノズル６として採用したランスの
全体を示したもので、４個の吹錬用O2吹込主ノ
ズル４の中間部に４個の２次燃焼用O2吹込用副
ノズル６を備えランス中央の酸素経路８からO2
供給内圧で各々のノズルにO2を吹込むように配
し、かつランスチツプおよびランス外周は従来と
同様に冷却水路１０を設けて炉内の熱から保護す
る構成となつている。 4A and 4B are the sub nozzles 6 shown in FIGS. 3A to 3E.
This figure shows the entire lance in which O 2 injection main nozzles 4 are used for blowing, and four secondary combustion O 2 injection sub nozzles 6 are installed in the middle of the four O 2 injection main nozzles 4 for blowing. O2 from the oxygen path 8 in the center of the lance
O 2 is arranged to be blown into each nozzle at supply internal pressure, and the lance tip and lance outer periphery are provided with cooling water passages 10 as in the prior art to protect them from the heat inside the furnace.
この場合の副ノズル６の仕様は、d2／d1＝1.8、
d3／d1＝2.4、ｌ＝20d3であり、実験において酸
素経路８内の圧力は9.5Kg／cm2とした時、ノズル
先端のO2噴出流は約70ｍ／ｓの速度であつた。
従つて、第４図の転炉上吹ランスにおいては、主
ノズル４からマツハ数Ｍ＞１の超音速でO2が鋼
浴撹拌と脱炭に供され、一方副ノズル６からは70
ｍ／ｓ程度の亜音速のO2噴出流が噴出され、効
率的な２次燃焼を行うことができた。 The specifications of the sub nozzle 6 in this case are d 2 /d 1 = 1.8,
d 3 /d 1 = 2.4, l = 20 d 3 , and in the experiment, when the pressure in the oxygen path 8 was 9.5 Kg/cm 2 , the O 2 jet flow at the nozzle tip had a speed of about 70 m/s. .
Therefore, in the converter top-blowing lance shown in FIG.
A subsonic O 2 jet flow of about m/s was ejected, and efficient secondary combustion could be performed.
第４図に図示の本発明の転炉上吹ランスを用
い、底吹きも併用して200t／ch転炉で主ノズルか
ら500Nm3／min、副ノズルから170Nm3／minの
酸素を吹込み、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
15〜25％増であるにもかかわらず燃焼帯形成域が
ランス先端から１〜２ｍ、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. 4 and also bottom blowing, oxygen was blown at 500Nm 3 /min from the main nozzle and 170Nm 3 /min from the sub nozzle in a 200t/ch converter. When the lance height is 3.5 m, the secondary combustion rate of CO gas generated in the furnace is 35 to 40%, which is higher than the conventional rate.
Despite the 15-25% increase, the combustion zone formation area is 1-2 m from the lance tip and 1-2 m above the steel bath interface.
Since it was formed in an almost ideal area of 2 m, the heat transfer efficiency reached 60 to 70%.
その結果、転炉原料中のスクラツプ比を20％程
度まで高めることができ、従来のほぼ４倍の大量
のスクラツプを処理することができた。 As a result, we were able to increase the scrap ratio in the converter raw material to approximately 20%, and were able to process approximately four times as much scrap as before.
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く先拡がりおよ
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２次燃焼率を向上することにより、炉内
発生のCO燃焼率は従来の15〜20％増であるにも
かかわらず、転炉装入原料のスクラツプ比を従来
の４倍にも増加す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 improves the secondary combustion rate by providing a sub nozzle with a shape that expands at the tip and/or is provided with a gas fluid resistance element so that the ejection flow velocity of the sub nozzle becomes subsonic. Despite the fact that the combustion rate of CO generated in the furnace was 15 to 20% higher than conventional methods, we were able to achieve the revolutionary effect of increasing the scrap ratio of raw material charged to the converter by four times compared to conventional methods. .
第１図Ａ，Ｂ，Ｃ，Ｄは本発明の先拡がりの副
ノズルの態様を示す縦断面図、第１Ｂ図Ａ，Ｂは
第１図Ｂの態様の副ノズルを具備する本発明によ
る転炉吹錬用ランスの実施例を示し、Ａは先端部
の縦断面図、ＢはＡのＢ−Ｂ折線矢視断面図、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はいずれも本
発明の特徴とする副ノズルを備えた転炉吹錬用ラ
ンスを示し、Ａは縦断面図、Ｂは横断面図、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……酸素経路、１
０……冷却水路、１２……多孔板、１４……流路
断面変更板。
FIGS. 1A, B, C, and D are longitudinal cross-sectional views showing embodiments of the sub-nozzle with a flared tip according to the present invention, and FIGS. An example of a lance for furnace blowing is shown, where A is a longitudinal sectional view of the tip, B is a sectional view taken along the line B-B of A, and FIGS. A is a vertical sectional view, and B is a B- of A.
B-arrow sectional view and FIGS. 3 A-E all show other embodiments of the present invention, A is a longitudinal sectional view, B-E
4A and 4B are sectional views of various parts of A, and FIGS. 4A and 4B both show a converter blowing lance equipped with a sub-nozzle, which is a feature of the present invention, A is a longitudinal sectional view, B is a horizontal sectional view, and FIG. 5
Figures A and B both show conventional converter blowing lances, where A is a cross-sectional view and B is a cross-sectional view taken along the line BB of A. 2... Lance for blowing, 4... Main nozzle for blowing,
6... Secondary combustion nozzle, 8... Oxygen path, 1
0... Cooling water channel, 12... Perforated plate, 14... Channel cross section changing plate.
Claims (1)
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
けた形状またはこれらの両者を組合せた形状であ
ることを特徴とする転炉吹錬用ランス。1. In a converter blowing lance that is equipped with a main nozzle and a subnozzle for refining, the subnozzle has a tapered shape so that the ejection flow velocity is subsonic, or has a gas flow structure such as a perforated plate or a flow path cross-section changing plate inside. A converter blowing lance characterized by having a shape provided with a resistor or a combination of both.
Priority Applications (7)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP60182487A JPS6244517A (en) | 1985-08-20 | 1985-08-20 | Lance for converter blowing |
| CA000516195A CA1293121C (en) | 1985-08-20 | 1986-08-18 | Lance for blow-refinement in converter |
| US06/897,524 US4746103A (en) | 1985-08-20 | 1986-08-18 | Lance for blow-refinement in converter |
| KR1019860006818A KR930007311B1 (en) | 1985-08-20 | 1986-08-19 | Converter drill lance |
| BR8603962A BR8603962A (en) | 1985-08-20 | 1986-08-19 | BLOW FOR REFINING IN A 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 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP60182487A JPS6244517A (en) | 1985-08-20 | 1985-08-20 | Lance for converter blowing |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6244517A JPS6244517A (en) | 1987-02-26 |
| JPH0377247B2 true JPH0377247B2 (en) | 1991-12-10 |
Family
ID=16119138
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP60182487A Granted JPS6244517A (en) | 1985-08-20 | 1985-08-20 | Lance for converter blowing |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6244517A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6903475B2 (en) | 2001-02-23 | 2005-06-07 | Black & Decker Inc. | Stator assembly with an overmolding that secures magnets to a flux ring and the flux ring to a stator housing |
| US7038343B2 (en) | 2002-02-22 | 2006-05-02 | Black & Decker Inc. | Field assembly for a motor and method of making same |
-
1985
- 1985-08-20 JP JP60182487A patent/JPS6244517A/en active Granted
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6903475B2 (en) | 2001-02-23 | 2005-06-07 | Black & Decker Inc. | Stator assembly with an overmolding that secures magnets to a flux ring and the flux ring to a stator housing |
| US6983529B2 (en) | 2001-02-23 | 2006-01-10 | Black & Decker Inc. | Stator assembly with an overmolding that secures magnets to a flux ring and the flux ring to a stator housing |
| US7088024B2 (en) | 2001-02-23 | 2006-08-08 | Black & Decker Inc. | Field assembly for a motor and method of making same |
| US7091642B2 (en) | 2001-02-23 | 2006-08-15 | Black & Decker Inc. | Field assembly for a motor and method of making same |
| US7119469B2 (en) | 2001-02-23 | 2006-10-10 | Black & Decker Inc. | Stator assembly with an overmolding that secures magnets to a flux ring and the flux ring to a stator housing |
| US7038343B2 (en) | 2002-02-22 | 2006-05-02 | Black & Decker Inc. | Field assembly for a motor and method of making same |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6244517A (en) | 1987-02-26 |
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