JPH0819451B2 - Method of blowing carbonaceous powder into the converter - Google Patents
Method of blowing carbonaceous powder into the converterInfo
- Publication number
- JPH0819451B2 JPH0819451B2 JP62235838A JP23583887A JPH0819451B2 JP H0819451 B2 JPH0819451 B2 JP H0819451B2 JP 62235838 A JP62235838 A JP 62235838A JP 23583887 A JP23583887 A JP 23583887A JP H0819451 B2 JPH0819451 B2 JP H0819451B2
- Authority
- JP
- Japan
- Prior art keywords
- converter
- blowing
- powder
- carbonaceous material
- carbonaceous
- 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
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- 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、転炉内二次燃焼法に起因して発生する転炉
内の耐火物の溶損を可及的に抑制できる転炉への炭材粉
吹き込み方法に関するものである。DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention provides a converter capable of suppressing the melting loss of refractory in the converter caused by the secondary combustion method in the converter as much as possible. The present invention relates to a method of blowing carbonaceous powder.
（従来の技術） 転炉におけるスクラップ溶解能の向上、鉱石類の還元
量の増加を目的として、従来より転炉への熱付与技術の
開発が盛んに行われている。中でも最近時に研究、開発
されているものが、転炉内二次燃焼法である。これは、
転炉内に特殊な上吹ランス、水平羽口等を設け、ここか
ら吹き込むO2ガスジェットにより、転炉内で発生したCO
ガスを燃焼させ、その燃焼熱を溶湯に着熱させる方法で
あり、コストの面や〔Ｓ〕の上昇を伴わないなどの点か
ら極めて有利ではあるが、この二次燃焼（CO＋1/2・O2
→CO2）は気相での発熱反応を利用するものである為、
二次燃焼比率〔CO2/（CO2＋CO）〕を上昇させた場合排
ガスの温度が非常に高温になり転炉内の耐火物溶損が激
しくなる。(Prior Art) For the purpose of improving scrap melting ability in a converter and increasing an amount of ores reduced, a technique for applying heat to a converter has been actively developed. Among them, what has been recently researched and developed is the secondary combustion method in a converter. this is,
A special top blowing lance, horizontal tuyere, etc. are installed in the converter, and the CO 2 generated in the converter is generated by the O 2 gas jet blown from here.
This is a method of burning the gas and applying the heat of combustion to the molten metal, which is extremely advantageous in terms of cost and no increase in [S], but this secondary combustion (CO + 1/2 · O 2
→ CO 2 ) uses the exothermic reaction in the gas phase,
When the secondary combustion ratio [CO 2 / (CO 2 + CO)] is increased, the temperature of the exhaust gas becomes extremely high and the melting loss of refractory in the converter becomes severe.
また、この二次燃焼法は排ガス中のCOが低下してCO2
が上昇する為、排ガスのカロリーが低下してしまうとい
う問題があった。Also, the secondary combustion technique decreases the CO in the exhaust gas CO 2
However, there is a problem in that the calorie of the exhaust gas is reduced because of the increase of.
そこでこれらの問題点を解決せんとして、転炉の絞
り部より炭材を吹き込む方法、絞り部に炭素系物質を
コーティングする方法、等が提案されている。Therefore, in order to solve these problems, a method of blowing carbonaceous material from the narrowed portion of the converter, a method of coating the narrowed portion with a carbon-based material, and the like have been proposed.
（発明が解決しようとする問題点） 上記した、の方法によって前記二次燃焼の発熱反
応の際に発生する問題は解決されるが、本発明者等の実
験によればこれら、の方法では、以下に述べる問題
を伴うことが明らかになった。(Problems to be Solved by the Invention) Although the above-mentioned method solves the problems that occur during the exothermic reaction of the secondary combustion, according to the experiments by the present inventors, these methods, It has become clear that it involves the following problems.
まず、の転炉の絞り部に炭材粉吹き込みノズルを設
置して転炉内に炭材粉を吹き込む方法では、ノズルの設
置場所に制約があり、均一な炭材粉吹き込みが困難であ
ると共に、ノズル出口付近が過冷却となり、転炉耐火物
のスポーリングが生じてしまう。First, in the method of installing a carbonaceous material blowing nozzle in the narrowed part of the converter and injecting the carbonaceous material powder into the converter, there is a restriction on the installation location of the nozzle, and it is difficult to uniformly inject the carbonaceous material powder. However, the vicinity of the nozzle outlet becomes supercooled, and spalling of converter refractory material occurs.
また、の転炉の絞り部耐火物表面に炭素系物質をコ
ーティングする方法では、転炉内の溶湯の出湯中に
〔Ｃ〕が上昇してしまう等である。Further, in the method of coating the refractory surface of the refractory part of the converter with the carbonaceous material, [C] rises during the molten metal discharge in the converter.
本発明は、上記したような従来提案された及びの
方法にあった問題点を伴うことなく、前記二次燃焼の発
熱反応の際に発生する問題を解決することのできる転炉
への炭材粉吹き込み方法を提供せんとするものである。The present invention is a carbonaceous material for a converter capable of solving the problems that occur during the exothermic reaction of the secondary combustion, without the problems associated with the previously proposed and methods described above. It is intended to provide a method for blowing powder.
（問題点を解決するための手段） 本発明は、転炉内に上吹ランスを介して炭材粉を吹き
込む方法において、前記炭材粉の炉底からの吹き込み高
さ位置を、炉底から炉口迄の高さの0.5〜1.1倍の範囲内
とすると共に、該吹き込み高さ位置での炭材粉噴出角度
を水平に対し±30゜の範囲内とすることを要旨とする転
炉への炭材粉吹き込み方法である。(Means for Solving Problems) The present invention relates to a method for blowing carbonaceous material powder into a converter through an upper blowing lance, in which the blowing height position of the carbonaceous material powder from the furnace bottom is set from the furnace bottom. To the converter that is within the range of 0.5 to 1.1 times the height to the furnace mouth, and the carbon powder ejection angle at the blowing height position is within ± 30 ° with respect to the horizontal It is a method of blowing carbonaceous powder.
本発明において、炭材粉の炉底からの吹き込み高さHi
位置を、炉底から炉口迄の高さH0の0.5〜1.1倍の範囲内
とするのは、0.5倍未満であれば炭材粉の吹き込みによ
る吸熱反応によって溶湯への伝熱量が減少してしまい、
転炉本来の昇温機能が不十分になるからである。また、
1.1倍を超えると本発明の目的である耐火物保護効果が
減ぜられるからである。In the present invention, the blowing height Hi of carbonaceous powder from the furnace bottom
The position should be within the range of 0.5 to 1.1 times the height H 0 from the bottom to the mouth of the furnace.If it is less than 0.5 times, the amount of heat transfer to the molten metal decreases due to the endothermic reaction due to the blowing of carbonaceous powder. And
This is because the original temperature raising function of the converter becomes insufficient. Also,
This is because if it exceeds 1.1 times, the refractory protection effect which is the object of the present invention is reduced.
また本発明において、炭材粉の噴出角度を水平に対し
て±30゜の範囲内とするのは、−30゜を超えると（下向
き）、転炉本来の昇温機能が不十分となるからであり、
また＋30゜を超えると（上向き）、耐火物保護効果が減
ぜられるからである。また、炭材粉粒度については特に
限定しないが粒度が細かい方が反応性が良いため、1mm
以下とするのが好ましい。Further, in the present invention, the jetting angle of the carbonaceous material powder is set within the range of ± 30 ° with respect to the horizontal because when it exceeds -30 ° (downward), the original temperature raising function of the converter becomes insufficient. And
If it exceeds + 30 ° (upward), the refractory protection effect will be diminished. The particle size of the carbonaceous material is not particularly limited, but the smaller the particle size, the better the reactivity, so 1 mm
It is preferable to set the following.
（作用） 本発明に係る転炉への炭材粉吹き込み方法は、転炉内
に炭材粉を吹き込む方法において、前記炭材粉の炉底か
らの吹き込み高さ位置を、炉底から炉口迄の高さの0.5
〜1.1倍の範囲内とすると共に、該吹き込み高さ位置で
の炭材粉噴出角度を水平に対し±30゜の範囲内とするも
のであり、前記位置で吹き込まれた炭材粉によって該部
分の排ガス温度が低下して転炉内耐火物の溶損を効率良
く防止できる。(Operation) A method for blowing carbonaceous material powder into a converter according to the present invention is a method of injecting carbonaceous material powder into a converter, in which the blowing height position of the carbonaceous material powder from the furnace bottom is determined from the furnace bottom to the furnace mouth. Height up to 0.5
Within 1.1 times the range, and the carbonaceous powder ejection angle at the blowing height position is within ± 30 ° with respect to the horizontal, and the portion due to the carbonaceous powder blown at the position. The temperature of the exhaust gas is reduced, and the melting loss of refractory in the converter can be efficiently prevented.
（実 施 例） 以下本発明方法を添付図面に基づいて説明する。(Examples) The method of the present invention will be described below with reference to the accompanying drawings.
第１図は、本発明に係る方法を実施する転炉構造を説
明する概略断面図であり、図中１は転炉、２は底吹ノズ
ル、３は溶湯、４は前記溶湯３表面に発生するスラグ、
５は上吹ランス、６は上吹ランス５の先端より噴射され
るO2ガスジェット、７は前記上吹ランス５の外周部より
噴出せしめられた炭材粉である。FIG. 1 is a schematic sectional view for explaining a converter structure for carrying out the method according to the present invention, in which 1 is a converter, 2 is a bottom blowing nozzle, 3 is molten metal, and 4 is generated on the surface of the molten metal 3. Slag,
Reference numeral 5 is an upper blowing lance, 6 is an O 2 gas jet injected from the tip of the upper blowing lance 5, and 7 is a carbonaceous powder ejected from the outer peripheral portion of the upper blowing lance 5.
第２図は、本発明に係る方法を実施する上吹ランス５
の拡大断面図である。この上吹ランス５は、通常使用さ
れる上吹ランスのように、冷却水入側ライン８より導入
される冷却水を循環させた後、冷却水出側ライン９より
排出する水冷構造の外周壁をもつO2ライン10及びO2ノズ
ル11によって構成されており、本発明方法に使用する場
合にはさらにこの上吹ランス５の外周、詳しくは冷却水
入側ライン８の外周に炭材粉噴出ノズル12を有する炭材
粉搬送ライン13を設置し、前記炭材粉噴出ノズル12より
炭材粉７を吹込む構造としている。FIG. 2 shows a top blowing lance 5 for carrying out the method according to the invention.
FIG. The upper blow lance 5 is, like a commonly used upper blow lance, an outer peripheral wall of a water cooling structure in which cooling water introduced from a cooling water inlet side line 8 is circulated and then discharged from a cooling water outlet side line 9. It is composed of an O 2 line 10 and an O 2 nozzle 11 each having a nozzle. When used in the method of the present invention, the carbonaceous powder is spouted on the outer periphery of the upper blowing lance 5, more specifically, the outer periphery of the cooling water inlet side line 8. A carbonaceous material powder conveying line 13 having a nozzle 12 is installed, and the carbonaceous material powder 7 is blown from the carbonaceous material powder jetting nozzle 12.
本発明方法は、上記した構成の上吹ランス５から転炉
内に炭材粉７を吹き込むものであり、炉底からの吹き込
み高さHi位置を、炉底から炉口迄の高さをH0とした場
合、その0.5〜1.1倍の範囲内とし、かつ炭材粉噴出ノズ
ル12からの噴出角度を水平に対して±30゜の範囲内とす
るのである。In the method of the present invention, the carbonaceous material powder 7 is blown into the converter from the upper blowing lance 5 having the above-described structure, and the blowing height Hi position from the furnace bottom and the height from the furnace bottom to the furnace mouth are set to H. When 0 is set, the range is 0.5 to 1.1 times the range, and the jet angle from the carbonaceous powder jet nozzle 12 is within ± 30 ° with respect to the horizontal.
なお、炭材粉７を噴出させるためのキャリアーガスと
しては何等限定されないが、O2以外のＮ、Ar等を用いる
ことが望ましい。The carrier gas for ejecting the carbonaceous powder 7 is not limited in any way, but it is desirable to use N, Ar or the like other than O 2 .
本実施例では炭材粉７を上吹ランス５を用いて噴出さ
れるものを示したが、これに限らず炭材粉吹込み専用の
ランスを用いてもよいことは勿論である。In this embodiment, the carbonaceous material powder 7 is ejected using the upper blowing lance 5, but the present invention is not limited to this, and it is of course possible to use a dedicated lance for blowing carbonaceous material powder.
次に本発明方法を実施した結果について説明し、本発
明方法の効果に及ぶ。Next, the results of carrying out the method of the present invention will be described to reach the effects of the method of the present invention.
その１） 10TON上下吹き転炉で、温度1270〜1295℃の溶銑を、
〔Ｃ〕0.05〜0.10重量％まで脱炭する操業において、炭
材粉吹込方向と水平線のなす角度θを０゜（水平方向）
に固定し、吹き込み高さHiを種々変化させた時の絞り部
における耐火物溶損速度（使用耐火物:MgO−Ｃレンガ）
及び、スクラップ溶解能の変化を、通常方法（炭材粉吹
き込みなし）と対比し、第３図に示す。Part 1) In a 10TON vertical blowing converter, hot metal with a temperature of 1270 ~ 1295 ℃
[C] In the operation of decarburizing from 0.05 to 0.10% by weight, the angle θ between the carbon powder injection direction and the horizontal line is 0 ° (horizontal direction)
Of refractory in the narrowed portion when the blowing height Hi is changed variously (refractory used: MgO-C brick)
Also, the change in scrap dissolving ability is shown in FIG. 3 in comparison with the normal method (without carbon material blowing).
第３図より明らかな如く、炭材粉吹込の効果により、
通常法と比較して耐火物溶損量が減少していることがわ
かる。また、Hiが1.1H0を超えると耐火物溶損防止効果
がなくなり、Hiが0.5H0未満になるとスクラップ溶解能
が通常法よりも低下してしまうことが判る。As is clear from Fig. 3, due to the effect of carbon powder injection,
It can be seen that the amount of refractory erosion is reduced compared to the conventional method. Further, it is understood that when Hi exceeds 1.1H 0 , the refractory erosion preventive effect is lost, and when Hi is less than 0.5H 0 , the scrap dissolving ability becomes lower than in the conventional method.
その２） 上記と同様な条件において炭材粉吹込高さを0.8H0に
固定し、炭材粉吹き込み方向と水平線をなす角度θを種
々変化させた時の絞り部における耐火物溶損速度を第４
図に示す。2) Under the same conditions as above, the carbonaceous material blowing height was fixed at 0.8H 0 , and the refractory melting rate at the throttle was varied when the angle θ forming the horizon with the carbonaceous material blowing direction was variously changed. Fourth
Shown in the figure.
第４図より明らかな如く、炭材粉吹込方向と水平線の
なす角度θが＋30゜（上向き）を超えると耐火物溶損効
果が減じるが、それ以下の角度では、効果が認められ
る。ただし、−30゜（下向き）を超えると、溶銑及びス
ラグにまで冷却効果が及び、転炉本来の昇温機能が低下
する。As is clear from FIG. 4, when the angle θ between the carbon powder blowing direction and the horizon exceeds + 30 ° (upward), the refractory erosion effect decreases, but below this angle, the effect is recognized. However, if it exceeds -30 ° (downward), the cooling effect extends to the hot metal and slag, and the original temperature raising function of the converter decreases.
なお前記実施例その１）及びその２）における炭材粉
吹き込み条件は以下の如くである。The conditions for blowing carbonaceous powder in Examples 1) and 2) are as follows.
吹き込み量:250kg/hr 炭材粉組成： C:88重量％ SiO2:5.9重量％ Al2O3:3.4重量％ 炭材粉粒度＜1mm 吹き込みノズル：φ11mm×８孔 （発明の効果） 以上説明したように、本発明に係る転炉への炭材粉吹
き込み方法は転炉内に炭材粉を吹き込む方法において、
前記炭材粉の炉底からの吹き込み高さ位置を、炉底から
炉口迄の高さの0.5〜1.1倍の範囲内とすると共に、該吹
き込み高さ位置での炭材粉噴出角度を水平に対し±30゜
の範囲内とするものである為、転炉における二次燃焼の
発熱反応の際に生じる高温な排ガスによる耐火物溶損の
問題、排ガス中のCOの低下、及びCO2の上昇による排ガ
スのカロリーの低下の問題を、転炉本来の昇温機能を低
下させることなく解決できる。また、本発明方法では、
二次燃焼比率が高い状況下でも炉内の排ガス温度を低下
できる為、耐火物保護効果が効率よく発揮される。さら
にこれまでに提案された従来方法に生じる問題を伴うこ
ともなく、二次燃焼法の目的を十分達成できると共に転
炉の耐火物を保護するという効果を発揮することができ
る。Blowing amount: 250 kg / hr carbon material powder composition: C: 88 wt% SiO 2: 5.9 wt% Al 2 O 3: 3.4 wt% carbonaceous material powder particle size <1 mm blowing nozzle: φ11mm × 8 holes (Effect of the Invention) The above-described As described above, the method for injecting carbonaceous material powder into the converter according to the present invention is a method for injecting carbonaceous material powder into the converter,
The position of the blowing height of the carbonaceous powder from the furnace bottom is within a range of 0.5 to 1.1 times the height from the furnace bottom to the furnace mouth, and the carbonaceous powder ejection angle at the blowing height position is horizontal. Since it is within ± 30 °, the problem of melting of refractory due to high temperature exhaust gas generated during the exothermic reaction of secondary combustion in the converter, reduction of CO in exhaust gas, and CO 2 It is possible to solve the problem of the reduction in calorie of exhaust gas due to the rise without deteriorating the temperature rising function inherent in the converter. In the method of the present invention,
Even when the secondary combustion ratio is high, the temperature of exhaust gas in the furnace can be lowered, so that the refractory protection effect can be efficiently exhibited. Further, the object of the secondary combustion method can be sufficiently achieved and the refractory material of the converter can be protected without any problems occurring in the conventional methods proposed so far.
第１図は本発明方法を実施する転炉構造の説明図、第２
図は本発明方法に使用する上吹ランスの一例を示す断面
図、第３図及び第４図は本発明方法の実験結果を示す図
である。 １は転炉、３は溶湯、５は上吹ランス、７は炭材粉。FIG. 1 is an explanatory view of a converter structure for carrying out the method of the present invention, and FIG.
The figure is a cross-sectional view showing an example of an upper blowing lance used in the method of the present invention, and FIGS. 3 and 4 are views showing the experimental results of the method of the present invention. 1 is a converter, 3 is a molten metal, 5 is a top blowing lance, and 7 is carbonaceous powder.
Claims (1)
を介して転炉内に石炭粉、コークス粉等の炭材粉を吹き
込む方法において、前記炭材粉の炉底からの吹き込み高
さ位置を、炉底から炉口迄の高さの0.5〜1.1倍の範囲内
とすると共に、該吹き込み高さ位置での炭材粉噴出角度
を水平に対し±30の範囲内とすることを特徴とする転炉
への炭材粉吹き込み方法。1. A method of blowing carbonaceous material powder such as coal powder, coke powder, etc. into a converter through an upper blowing lance by a converter having an upper blowing lance, the height of the carbonaceous material being blown from the bottom of the furnace. The position is within the range of 0.5 to 1.1 times the height from the furnace bottom to the furnace mouth, and the carbon powder ejection angle at the blowing height position is within ± 30 with respect to the horizontal. The method of blowing carbonaceous powder into the converter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62235838A JPH0819451B2 (en) | 1987-09-18 | 1987-09-18 | Method of blowing carbonaceous powder into the converter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62235838A JPH0819451B2 (en) | 1987-09-18 | 1987-09-18 | Method of blowing carbonaceous powder into the converter |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6479313A JPS6479313A (en) | 1989-03-24 |
| JPH0819451B2 true JPH0819451B2 (en) | 1996-02-28 |
Family
ID=16992012
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP62235838A Expired - Lifetime JPH0819451B2 (en) | 1987-09-18 | 1987-09-18 | Method of blowing carbonaceous powder into the converter |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0819451B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115786628A (en) * | 2022-11-12 | 2023-03-14 | 甘肃酒钢集团宏兴钢铁股份有限公司 | Method for top-purging furnace bottom by using carbon dioxide and oxygen mixture |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6167708A (en) * | 1984-09-10 | 1986-04-07 | Nippon Steel Corp | Refining method of iron alloy |
-
1987
- 1987-09-18 JP JP62235838A patent/JPH0819451B2/en not_active Expired - Lifetime
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6167708A (en) * | 1984-09-10 | 1986-04-07 | Nippon Steel Corp | Refining method of iron alloy |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6479313A (en) | 1989-03-24 |
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