JPS6136050B2 - - Google Patents
Info
- Publication number
- JPS6136050B2 JPS6136050B2 JP11346980A JP11346980A JPS6136050B2 JP S6136050 B2 JPS6136050 B2 JP S6136050B2 JP 11346980 A JP11346980 A JP 11346980A JP 11346980 A JP11346980 A JP 11346980A JP S6136050 B2 JPS6136050 B2 JP S6136050B2
- Authority
- JP
- Japan
- Prior art keywords
- furnace
- tuyere
- tuyeres
- area
- circumference
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
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
- C21C5/30—Regulating or controlling the blowing
- C21C5/35—Blowing from above and through the bath
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
Description
【発明の詳細な説明】
この発明は上下吹錬用転炉に関する。転炉製鋼
法において、酸素の上吹きを行うと同時に炉底に
羽口を設けて、ここから撹拌ガスを鋼浴内に吹込
むいわゆる上下吹錬が近年行われるようになつて
きた。この上下吹錬に用いられる転炉は、通常そ
の炉底の中心付近に複数の羽口を備えている。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a converter for top and bottom blowing. In recent years, in the converter steel manufacturing process, so-called top-bottom blowing, in which oxygen is top-blown and at the same time a tuyere is provided at the bottom of the furnace, and stirring gas is blown into the steel bath, has come to be used. The converter used for this top-bottom blowing usually has a plurality of tuyeres near the center of its bottom.
その一例を第１図及び第２図に示す。図中１０
は炉本体、１１は羽口、１２はランス、１３は鋼
浴、１４はスラグである。羽口１１は炉中心から
等距離の位置に配設されている。また羽口１１を
多数設ける場合は炉中心を挾んで平行に配設する
のが通例である。 An example is shown in FIGS. 1 and 2. 10 in the diagram
11 is a furnace body, 11 is a tuyere, 12 is a lance, 13 is a steel bath, and 14 is a slag. The tuyeres 11 are arranged equidistant from the center of the furnace. Further, when a large number of tuyeres 11 are provided, it is customary to arrange them in parallel with the center of the furnace in between.
しかしながら、このような従来の羽口の配置で
は、羽口１１からの撹拌ガスは炉中心部から炉壁
方向に向かう流れを形成するため鋼浴１３の撹拌
は十分に行われるものの、スラグ１４は炉壁の周
囲に集まつても滞留し十分に撹拌されず、鋼浴１
３の脱リンも十分に行われないという欠点があつ
た。 However, in such a conventional tuyere arrangement, the stirring gas from the tuyere 11 forms a flow from the furnace center toward the furnace wall, so although the steel bath 13 is sufficiently stirred, the slag 14 is Even if it collects around the furnace wall, it remains and is not stirred sufficiently, causing the steel bath 1
There was also a drawback that the dephosphorization in step 3 was not carried out sufficiently.
本発明はこの従来のものの欠点を改善するため
になされたもので、スラグの撹拌を十分に行い得
る上下吹錬用転炉を提供することを目的とする。 The present invention has been made to improve the drawbacks of the conventional converter, and an object of the present invention is to provide a converter for top-bottom blowing that can sufficiently stir slag.
本発明による上下吹錬用転炉において撹拌ガス
吹込み用羽口は次のように配設される。まず炉本
体の炉底に火点外周の投影線を想定する。またこ
の火点外周と炉壁までの距離の1/2の点が描く円
周を想定する。該火点外周は上吹ランスノズルの
ノズル角度と該ランスノズルの湯面との距離とか
ら幾何的に決定される。該火点外周と該円周との
間の区域を第１区域とし、該円周と炉壁との間の
区域を第２区域とし、夫々の区域に少なくとも２
個の羽口を設ける。第１区域における羽口と第２
区域における羽口とは炉中心を通る直線上に並ば
ないように配設する。 In the top-bottom blowing converter according to the present invention, the tuyeres for blowing stirring gas are arranged as follows. First, imagine the projection line of the outer periphery of the fire point on the bottom of the furnace body. Also, assume the circumference drawn by a point that is 1/2 the distance between the outer circumference of the fire point and the furnace wall. The outer periphery of the fire point is determined geometrically from the nozzle angle of the top blowing lance nozzle and the distance between the lance nozzle and the hot water level. The area between the outer circumference of the fire point and the circumference is defined as a first area, the area between the circumference and the furnace wall is defined as a second area, and each area has at least two
Provide tuyeres. The tuyeres in the first area and the second
The tuyeres in the area are arranged so that they are not lined up in a straight line passing through the center of the furnace.
このような構成によりスラグの撹拌が十分に行
われ、脱リン化の促進を得ることが出来る。 With such a configuration, the slag can be sufficiently stirred and dephosphorization can be promoted.
以下本発明の一実施例を図面に基づいて詳説す
る。 An embodiment of the present invention will be explained in detail below based on the drawings.
第３図及び第４図は炉体の横断面図で、１は炉
体、２は羽口、３は火点外周、４は火点外周３と
炉壁１′との距離ｄの1/2の点が描く円周である。
火点外周３と円周４との間の円環状の第１の区域
Ａと円周４と炉壁１′との間の円環状の第２の区
域Ｂには180゜対称の位置に一対の羽口２ａ，２
ａ及び２ｂ，２ｂが夫々設けられている。区域Ａ
の羽口２ａ，２ａと区域Ｂの羽口２ｂ，２ｂとは
炉中心を通る直線上に竝ばないように配設する。
これは撹拌性を良くするためである。また各区域
には少なくとも２個の羽口を設ける。これ以下で
あると撹拌が十分に行われないためである。 3 and 4 are cross-sectional views of the furnace body, where 1 is the furnace body, 2 is the tuyere, 3 is the outer periphery of the hot spot, and 4 is 1/1/2 of the distance d between the outer periphery of the hot spot 3 and the furnace wall 1'. This is the circumference of the circle drawn by point 2.
A first annular area A between the outer circumference 3 of the fire point and the circumference 4 and a second annular area B between the circumference 4 and the furnace wall 1' have a pair of annular sections symmetrically arranged at 180 degrees. Tuyere 2a, 2
a, 2b, and 2b are provided, respectively. Area A
The tuyere 2a, 2a of the area B and the tuyere 2b, 2b of the area B are arranged so as not to lie on a straight line passing through the center of the furnace.
This is to improve stirring performance. Each area shall also have at least two tuyeres. This is because if it is less than this, stirring will not be performed sufficiently.
以上のような構成において、羽口２ａ，２ａ及
び２ｂ，２ｂから撹拌ガスを吹込めば、第４図に
示すように羽口２ａ，２ａからの撹拌ガスは従来
と同様に鋼浴１３の撹拌に供せられるが、羽口２
ｂ，２ｂからの撹拌ガスは炉壁１′周辺に集まる
スラグ１４を撹拌し、このスラグを火点へ供給す
る。そのため脱リンが促進される。 In the above configuration, if stirring gas is injected from the tuyeres 2a, 2a and 2b, 2b, the stirring gas from the tuyeres 2a, 2a will stir the steel bath 13 as in the conventional case, as shown in FIG. The tuyere 2
The stirring gas from b and 2b stirs the slag 14 that collects around the furnace wall 1' and supplies this slag to the fire point. Therefore, dephosphorization is promoted.
第５図に本発明による転炉を用いた場合と、従
来の転炉を用いた場合の鋼中〔Ｐ〕をスラグ中の
Feとの関係で示す。炉はいずれも180TON炉を用
い、底吹きガスはCO2を用い、0.10Nm3／min.T.
steel吹き込んだ。本発明転炉における羽口の数
量及び配置は第３図に示すものと同様とし、炉中
心から羽口２ｂまでの距離を500mm、炉中心から
羽口２ａまでの距離を1500mmとした。従来炉では
第２図に示すように炉中心から500mmの距離に４
個の羽口１１を対称的に配置した。また本発明炉
及び従来炉ともに炉中心から火点外周までの距離
は300mm、炉中心から炉壁までの距離は2200mmで
あつた。 Figure 5 shows [P] in steel when using the converter according to the present invention and when using a conventional converter.
Shown in relation to Fe. A 180TON furnace is used for each furnace, CO 2 is used as the bottom blowing gas, and 0.10Nm 3 /min.T.
Steel-blown. The number and arrangement of tuyeres in the converter of the present invention were the same as those shown in FIG. 3, with the distance from the furnace center to the tuyere 2b being 500 mm, and the distance from the furnace center to the tuyere 2a being 1500 mm. In the conventional furnace, as shown in Figure 2, there are four
The tuyeres 11 are arranged symmetrically. Further, in both the furnace of the present invention and the conventional furnace, the distance from the furnace center to the outer periphery of the fire point was 300 mm, and the distance from the furnace center to the furnace wall was 2200 mm.
このグラフからわかるように、本発明炉イの場
合は従来炉ロに比べて鋼中〔Ｐ〕が少なくなつて
おり、スラグ撹拌の向上、脱リンの向上がはから
れていることがわかる。 As can be seen from this graph, in the case of the furnace A of the present invention, the amount of [P] in the steel is lower than that of the conventional furnace B, and it can be seen that slag agitation and dephosphorization are improved.
以上説明したように、本発明による上下吹錬用
転炉ではスラグの撹拌性が良く、脱リンが促進さ
れる等の優れた効果を得ることができる。 As explained above, the converter for top-bottom blowing according to the present invention has excellent slag agitation properties and can achieve excellent effects such as promoting dephosphorization.
第１図は従来の上下吹錬用転炉の縦断面図、第
２図は横断面図、第３図と第４図は本発明による
上下吹錬用転炉の一実施例の横断面図、第５図は
鋼中〔Ｐ〕とスラグ中Total Feとの関係を示す
グラフである。
図中、１は炉体、２は羽口、３は火点外周、４
は円周である。
FIG. 1 is a vertical cross-sectional view of a conventional converter for top-bottom blowing, FIG. 2 is a cross-sectional view, and FIGS. 3 and 4 are cross-sectional views of an embodiment of a converter for top-bottom blowing according to the present invention. , FIG. 5 is a graph showing the relationship between [P] in steel and total Fe in slag. In the figure, 1 is the furnace body, 2 is the tuyere, 3 is the outer periphery of the fire point, and 4
is the circumference.
Claims (1)
複合吹錬用転炉において、炉底を火点外周と火点
外周から炉壁までの距離の1/2の点が描く円周と
の間の第１の区域と、該円周と炉壁との間の第２
の区域とに区分し、前記第１の区域と第２の区域
とに夫々少なくとも２個の羽口を設け、しかも該
第１の区域における羽口と該第２の区域における
羽口とが炉底の中心を通る直線上に並ばないよう
に配設したことを特徴とする上下吹錬用転炉。1. In a combined blowing converter equipped with multiple stirring gas injection tuyeres at the bottom, the bottom of the furnace is defined as the circumference drawn by the outer periphery of the flashing point and a point half the distance from the outer periphery of the flashing point to the furnace wall. a first area between the circumference and a second area between the circumference and the furnace wall.
The first zone and the second zone are each provided with at least two tuyeres, and the tuyere in the first zone and the tuyere in the second zone are connected to the furnace. A converter for top and bottom blowing characterized by being arranged so that they are not lined up in a straight line passing through the center of the bottom.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11346980A JPS5739114A (en) | 1980-08-20 | 1980-08-20 | Converter for top and bottom blow refining |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11346980A JPS5739114A (en) | 1980-08-20 | 1980-08-20 | Converter for top and bottom blow refining |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5739114A JPS5739114A (en) | 1982-03-04 |
| JPS6136050B2 true JPS6136050B2 (en) | 1986-08-16 |
Family
ID=14613032
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP11346980A Granted JPS5739114A (en) | 1980-08-20 | 1980-08-20 | Converter for top and bottom blow refining |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5739114A (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0674680U (en) * | 1992-03-24 | 1994-10-21 | 株式会社喜多村合金製作所 | urinal |
| JP4710070B2 (en) * | 2000-09-07 | 2011-06-29 | 学 井口 | Stirrer |
| JP5282396B2 (en) * | 2007-11-30 | 2013-09-04 | Ｊｆｅスチール株式会社 | Top-bottom blowing converter |
| JP5527337B2 (en) * | 2012-02-02 | 2014-06-18 | 新日鐵住金株式会社 | Converter bottom structure and tuyere replacement method |
-
1980
- 1980-08-20 JP JP11346980A patent/JPS5739114A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5739114A (en) | 1982-03-04 |
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