JPS5837940Y2 - Lance pipe for top blowing - Google Patents

Description

【考案の詳細な説明】 本考案は、溶銑の炉外精錬、たとえば脱硫処理に使用さ
れる上吹用ランスパイプに関し、とくに二重構造の芯金
パイプが、被覆層の亀裂に侵入した溶銑によって穴あき
損傷されるのを防止し、ランスパイプの耐用性を高める
ことを目的とするものである。[Detailed Description of the Invention] The present invention relates to a top-blowing lance pipe used for out-of-furnace refining of hot metal, such as desulfurization, and in particular, the double-structured cored pipe is blown by hot metal that has penetrated into cracks in the coating layer. The purpose is to prevent damage due to holes and increase the durability of the lance pipe.

脱硫処理において使用される上吹用ランスパイプ（以下
、ランスと略記する）は、一般に高温の溶銑中に深く浸
漬されて外側から急熱される一方、内側は粉末状の脱硫
材を含んだキャリアーガスによって、比較的低温に保た
れる。Top-blowing lance pipes (hereinafter abbreviated as lances) used in desulfurization processing are generally deeply immersed in high-temperature hot metal and rapidly heated from the outside, while the inside is filled with carrier gas containing powdered desulfurization material. kept at a relatively low temperature.

したがって、直管部の被覆層の内外に熱応力差が発生し
て表面に亀裂が入り、これに溶銑が侵入して内部の芯金
パイプを穴あき損傷するので、３〜４回使用しただけで
廃却されることが多かった。Therefore, a difference in thermal stress occurs between the inside and outside of the coating layer of the straight pipe section, causing cracks on the surface, which allow hot metal to penetrate and damage the internal cored pipe with holes. were often discarded.

これに対して、最近、外面を不定形耐火物で被覆した外
側鋼管に、内側鋼管を内装して環状通路を形成した、二
層管タイプのインジェクション用ランス（実公昭５３−
４７０４４号公報）が提案されているが、被覆層の亀裂
から侵入した溶銑が外側鋼管を穴あき損傷し、さらに環
状通路に流入するのを、不活性ガスのみで冷却、凝固せ
しめて防止することはほとんど不可能と考えられ、上記
の問題が完全に解決されたとはいいがたい。On the other hand, recently, a double-layer pipe-type injection lance (1983-1992) has been developed, in which an annular passage is formed by an outer steel pipe whose outer surface is coated with a monolithic refractory and an inner steel pipe.
No. 47044) has been proposed, but it is possible to prevent molten metal from penetrating through cracks in the coating layer from damaging the outer steel pipe by causing holes and further flowing into the annular passage by cooling and solidifying with only an inert gas. is considered almost impossible, and it is difficult to say that the above problem has been completely solved.

本考案は、このような現状に対して完成されたものであ
って、その要点は外側管と内側管とで形成された二重構
造の芯金パイプ内に、耐火性の環状部材を１００〜５Ｑ
Ｑｍｍの間隔で移動可能に挿着するとともに耐火物粒を
充填したことであって、脱硫材を吹込む際の振動によっ
て、さらに使用時環状部材が耐火物粒を下方に押圧し、
−屠畜に充填するので冷却効果が向上する。The present invention was completed in response to the current situation, and its main point is to install a fire-resistant annular member of 100 to 100 mm inside a double-structured cored pipe formed by an outer pipe and an inner pipe. 5Q
The refractory granules are movably inserted at intervals of Qmm and filled with refractory granules, and the annular member presses the refractory granules downward during use due to the vibration when the desulfurization material is injected.
- The cooling effect is improved because it is filled into the slaughtered animal.

よって、被覆層の亀裂に侵入した溶溶は即座に冷却、凝
固されるので、芯金パイプが穴あき損傷されるのがほぼ
完全に防止できる。Therefore, the melt that has entered the cracks in the coating layer is immediately cooled and solidified, so that damage to the cored pipe due to holes can be almost completely prevented.

以下に、実施例を示す図面にもとづいて、本考案を詳細
に説明する。The present invention will be described in detail below based on drawings showing embodiments.

第１図において、１は長さ３〜４ｍの鋼製の外側管であ
って、その外面には、一般に周知のハイアルミナ質キャ
スタブルで厚さ５０〜７０ｍｍの被覆層２が設けられて
いる。In FIG. 1, reference numeral 1 denotes a steel outer tube with a length of 3 to 4 m, and a coating layer 2 of generally known high alumina castable with a thickness of 50 to 70 mm is provided on its outer surface.

３は外径約２５ｍｍの内側管であって外側管１に同心円
状に内装されて、巾が１０〜４Ｑｍｍの環状隙間４を有
する二重構造の芯金パイプ５を形成している。Reference numeral 3 denotes an inner tube with an outer diameter of about 25 mm, which is installed concentrically inside the outer tube 1 to form a double-structured core metal pipe 5 having an annular gap 4 with a width of 10 to 4 Q mm.

６は周知の耐火物製（ジルコニア質、マグネシア質）あ
るいは、耐熱金属製（ステンレス）の環状部材であって
、内側管３とは自由に移動できる程度に、また外側管１
とは後述する耐火物粒７が十分充填できる程度の間隙を
おいて、環状隙間４に１００〜５００ ｍｍの間隔で挿
着されている。Reference numeral 6 denotes an annular member made of a well-known refractory material (zirconia, magnesia) or heat-resistant metal (stainless steel), and is separated from the inner tube 3 to the extent that it can move freely, and is separated from the outer tube 1.
are inserted into the annular gap 4 at intervals of 100 to 500 mm, with a gap sufficient to fill with refractory particles 7, which will be described later.

そして、その形状は、第２図に拡大して示すように、一
般に円筒状のものが好適であって、肉厚は環状隙間４の
１／２〜３／４が、高さは同じくその０．５〜５．０倍
が望ましい。As shown in the enlarged view of FIG. 2, it is generally preferable to have a cylindrical shape, with a wall thickness of 1/2 to 3/4 of the annular gap 4 and a height of 0. .5 to 5.0 times is desirable.

なぜならば、肉厚が１／２より薄くなると、環状部材６
が軽くなって、耐火物粒７を下方へ押圧する作用が低下
するし、３／４より厚くなると、外側管１との間隙が狭
くなって、その部分に耐火物粒７が十分密に充填されな
いからである。This is because when the wall thickness becomes thinner than 1/2, the annular member 6
becomes lighter and the effect of pressing the refractory particles 7 downwards decreases, and if it becomes thicker than 3/4, the gap with the outer tube 1 becomes narrower and the refractory particles 7 are filled sufficiently densely in that area. This is because it is not done.

また高さは、０．５倍未満では環状部材６が軽くなりす
ぎるし、５倍以上では、芯金パイプ５が湾曲したとき、
環状部材６の内面が内側管３につかえて移動（沈下）で
きなくなるからである。Moreover, if the height is less than 0.5 times, the annular member 6 will become too light, and if the height is more than 5 times, when the core metal pipe 5 is curved,
This is because the inner surface of the annular member 6 gets stuck in the inner tube 3 and cannot move (sink).

なお、その長手方向の間隙は、前記のように経験上、１
００〜５ＱＱ ｍｍがよいが、とくにスラグライン相当
部を１００〜２００ ｍｍ程度に他所より長手方向間隔
を狭くしておくと、溶銑侵入防止の点でより効果的であ
る。In addition, as mentioned above, from experience, the gap in the longitudinal direction is 1
00 to 5QQ mm is preferable, but it is more effective in preventing molten metal from entering if the longitudinal spacing in the slag line equivalent part is narrower than in other parts to about 100 to 200 mm.

７は、環状隙間４に充填された、粒径０．０７〜５ｍｍ
の周知の耐火物粒であって、熱伝導率および溶銑に対す
るぬれ性などの点から、Ｃ−５ｉＣ系のものが最適であ
る。7 is filled in the annular gap 4 and has a particle size of 0.07 to 5 mm.
Among the well-known refractory grains, C-5iC-based refractory grains are optimal in terms of thermal conductivity and wettability with hot metal.

一般には黒鉛電極（屑）を粉砕したものが賞用されるが
、その他に、周知のジルコン質、マグネシア質のもので
もよく、また場合によっては、高アルミナ質の造粒物な
どでもよい。Generally, pulverized graphite electrodes (scrap) are used, but other materials such as well-known zircon and magnesia materials may also be used, and in some cases, high alumina granules may also be used.

その粒度は、０．０７ｍｍ未満では、粒のすべりが悪く
なって、キャリアーガス吹込時、ランス自体の不規則な
振動によって耐火物粒７が密に充填されないし、５ｍｍ
以上では、空隙率が高くなりすぎて冷却効果が低下する
から、上記の範囲が望ましい。If the particle size is less than 0.07 mm, the particles will not slip easily and the refractory particles 7 will not be densely packed due to irregular vibrations of the lance itself when carrier gas is blown into the carrier gas.
Above, the porosity becomes too high and the cooling effect decreases, so the above range is desirable.

なお、環状隙間４に環状部材６および耐火物粒７をそれ
ぞれ挿設、充填する手段としては、一般に実施されてい
るように、たとえば、直立、固定した芯金パイプ５の上
方から、まず所要量（深さ）の耐火物粒７を環状隙間４
内に投入し、その上に環状部材６を内側管３に差し込ん
で落下せしめたのち振動充填し、さらに必要に応じてこ
の操作を数回くりかえし実施して、第１図に示すように
、最後に上部の蓋板８およびフランジ９を取付けるとよ
い 本考案のランスを脱硫処理に使用する場合は、まず脱硫
装置のガス圧送パイプ（図示せず）にフランジ９を固く
連結し、キャリアーガスとともに脱硫材を噴出口１０か
ら溶１銑に吹込む。In addition, as a means for inserting and filling the annular member 6 and the refractory particles 7 into the annular gap 4, as is generally practiced, for example, first, from above the upright and fixed core metal pipe 5, the required amount (depth) of refractory grains 7 into annular gap 4
After inserting the annular member 6 into the inner tube 3 and letting it fall, vibration filling is performed, and if necessary, this operation is repeated several times to obtain the final result as shown in Figure 1. When using the lance of the present invention for desulfurization treatment, first firmly connect the flange 9 to the gas pressure pipe (not shown) of the desulfurization equipment, and then attach the upper cover plate 8 and flange 9 to the desulfurization unit along with the carrier gas. The material is blown into the molten pig iron from the spout 10.

その時前記のような理由によって被覆層２に亀裂が入り
、溶１銑が外側管１まで侵入してきても、耐火物粒７は
、ガス）吹込時の不規則な振動で環状部材６が沈下する
ことによって、さらに密に充填されるとともに、外側管
１が耐火物粒７を介して内側から良く冷却されているの
で、その溶銑は即座に冷却、凝固してしまう。At that time, even if cracks appear in the coating layer 2 due to the above-mentioned reasons and the molten pig iron penetrates into the outer tube 1, the annular member 6 sinks due to the irregular vibrations of the refractory particles 7 during gas injection. As a result, the outer tube 1 is packed even more densely, and since the outer tube 1 is well cooled from the inside through the refractory particles 7, the hot metal is instantly cooled and solidified.

よって、外側管１はほとんど損傷されないが万一、穴あ
き損傷され溶銑が環状隙間４に侵入してきても、耐火物
粒７はぬれ性が悪いうえに上記のように密に充填され、
かつ、内側管３を介してキャリアーガスによって冷却さ
れているので、その溶銑は同様にすぐに凝固してしまい
広範囲には拡大しない。Therefore, although the outer tube 1 is hardly damaged, even if it is damaged by a hole and hot metal enters the annular gap 4, the refractory particles 7 have poor wettability and are densely packed as described above.
Moreover, since it is cooled by the carrier gas through the inner tube 3, the hot metal similarly solidifies immediately and does not spread over a wide range.

以上詳記したように、本考案は、芯金パイプの環状隙間
に、適当な間隔をおいて環状部材を挿設し、その間に耐
火物粒を充填したランスであって、芯金パイプの穴あき
損傷を防止するとともに、万一損傷されても、その範囲
をできるだけ小さくおきえて、ランスの耐用性を６〜８
チヤージと従来の約２倍に延ばすことができ、製鋼業に
おいて大きな効果を発揮するものである。As described in detail above, the present invention is a lance in which annular members are inserted at appropriate intervals into an annular gap of a cored metal pipe, and refractory particles are filled between the annular members. In addition to preventing perforation damage, even if damage occurs, the range of damage is kept as small as possible, increasing the durability of the lance by 6 to 8.
The charge can be extended to about twice that of the conventional method, and it is highly effective in the steel manufacturing industry.

【図面の簡単な説明】[Brief explanation of drawings]

第１図は、本考案の一実施例を示す縦断面図、第２図は
、第１図の部分拡大図である。 図中、１・・・・・・外側管、２・・・・・・被覆管、
３・・・・・・内側管、４・・・・・・環状隙間、６・
・・・・・環状部材、７・・・・・・耐火物粒である。FIG. 1 is a longitudinal sectional view showing an embodiment of the present invention, and FIG. 2 is a partially enlarged view of FIG. 1. In the figure, 1... outer tube, 2... cladding tube,
3... Inner pipe, 4... Annular gap, 6...
. . . Annular member, 7 . . . Refractory particles.

Claims (1)

【実用新案登録請求の範囲】[Scope of utility model registration request] 耐火性の被覆層２を施こした外側管１に内側管３を内装
してなる環状隙間４内に、環状部材６を所要の間隔をお
いて移動可能に挿着するとともに、耐火物粒７を充填し
てなる上吹用ランスパイプ。An annular member 6 is movably inserted at a required interval into an annular gap 4 formed by an outer pipe 1 coated with a fire-resistant coating layer 2 and an inner pipe 3 therein, and refractory particles 7 A lance pipe for top blowing made by filling it with.