DE7613309U1 - LANCE FOR INJECTING FLUIDIZED SUBSTANCES INTO A METAL MELT - Google Patents

Description

Stahlwerke Peine-Salzgitter AG
P.O. Box 1740

3150 Peine

"Lance for injecting fluidized
Substances in a metal melt "

The innovation concerns a lance for injecting fluidized Substances in a molten metal, consisting of one with one

^PiS . Refractory mass sheathed steel tube, which is wrapped with wire that increases the adhesion of the refractory mass.

Such a lance can be found in DT-OS 24 39 700. Here stainless steel pins are welded onto the steel tube, the free ends of which are bent over parallel to the tube. At each end of the pipe, galvanized barbed wire is attached to these pins and wound around the pipe in a helical manner. The task of this special reinforcement is to enable a thicker coating of refractory material than with the previous ones
usual lances. In the prior publication, a 20 mm thick sheathing is considered optimal.

The disadvantage of such, provided with a thick sheath Lance is primarily due to the high buoyancy that acts on the lance immersed in the melt and thus

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j reduces the stability of the lance. Further disadvantages result. from the increased weight of the lance and the very cost-effective Playful production, due to the welding of the pins and the high material consumption for the sheathing.

The object of the innovation is to improve the lance explained at the beginning with regard to the disadvantages mentioned above.

According to the innovation, this object is achieved in that the wire is a high-knit wire mesh "that is like a cuff." is placed around the steel pipe that the refractory mass is high-alumina refractory concrete, and that the top cover of the

p. _s . Wire mesh is about 10 mm.
η

The teaching on which the invention is based thus points exactly in the cjuLyiyangoSotrtc direction in comparison to the Dt-pö ti ^ y 700. Compared to the known proposal, namely, the thickness of the refractory casing should be almost halved. For an average person skilled in the art it is surprising that, contrary to the opinion held up to now, such a thin casing nevertheless ensures a long service life C of the lance. The new embodiment has already proven itself excellently in long series of tests.

Wire mesh 10 χ 1.6 χ 1000 DIN, for example, can be used as a mesh wire mesh 1199-swg can be used. It is useful if the wire mesh sleeve is closed by a screwed wire weft. This weft of wire is twisted out of the wire mesh mat beforehand .

7613309 02.09.76

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Due to the unusually thin sheathing, the buoyancy forces acting on the lance are considerably reduced, so that an er. increased stability of the lance is achieved. In terms of production, the effort is significantly lower, since the expensive and Time-consuming welding of the armature is not necessary.

Used to inject the lance into contact with the molten metal only a small amount of gas-releasing fluidized substances is used advantageous if the refractory sheath extends to the blow end of the steel pipe, while the end of the wire mesh of this pipe end has a distance that corresponds to the tissue coverage. This training is particularly simple and technical in terms of production easy to manufacture.

If we want to find lance for blowing split off into contact with the molten metal much gas fluidized materials use, d ^ no: i ^{c +} · ^OER wvrteiihaft. if the lance head is designed as a nozzle head with several nozzle openings laterally guided through the refractory casing and a solids distributor closing the pipe end, the wire mesh extending to the pipe end, which in turn is encased on all sides by the refractory mass.

It is useful if the nozzle openings run obliquely from the inside to the outside towards the pipe end, and if the lower edges of the nozzle openings in the steel pipe with the upper edge of the solids distributor.

Further details and advantages of the innovation emerge from the structural description.

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In the drawing are two exemplary embodiments of the innovation shown in longitudinal section.

FIG. 1 shows a steel tube 1 around which a high-knit wire mesh 2 is placed in the manner of a sleeve. Every wire mesh sleeve is included closed by a screwed-in weft of wire 3. The wire mesh 2 is covered by a steel pipe 1 encased refractory mass 4, the overlap 5 of the wire mesh 2 is about 10 mm.

In the immersion lance shown in Figure 1, the sheathing extends from the refractory compound 4 to the bubble end 1a of the steel pipe 1, while the end of the wire mesh 2 from this pipe end 1a ^f ' _: ,' ₃ ^{5 has} a distance a that corresponds to the fabric cover 5 is equivalent to.

The dew lance shown in Figure 2 differs from that according to Fig. l only cturcn ax training of the Lanieukopfcs. This ict in Fig. 2 designed as a nozzle head with several laterally guided through the refractory casing 4 nozzle openings 6 and one the pipe end 1a closing the solids distributor 7. The Maächenr "" " Wire mesh 2 extends here as far as the pipe end 1 a, which in turn is encased on all sides by the refractory compound 4. As far as the Mesh size of the wire mesh 2 is less than twice the diameter of the nozzle openings 6, or the wire mesh would be too close to these nozzle openings, some wire mesh is cut away in the area of the nozzle openings 6.

The nozzle openings 6 run obliquely from the inside towards the pipe end 1a outwards, e.g. at an angle of 4 5 °. The

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Lower edges 6a of the nozzle openings 6 in the steel pipe 1 in the upper edge 7a of the solids distributor 7.

j The design of the nozzle openings 6 has an influence on the process

j I

¹ technique of blowing desulphurizing agents into liquid metal melts with changing immersion depths. Surprising-

I wisely shows that a venturi-like nozzle shape leads to an er j

¹ I.

I heblichen increase the throughput rate of the desulfurization I (J j averaging means into the liquid metal melt leads This ^leaves;. I is the time j, the lance to the chemical attack by the melt and slag is exposed to substantially shorten Larger throughput.
; Set speeds also have the advantage for lance durability that the lance is better cooled. It is also

DlENSl I

ps j represent that the promotion of the gas stream laden with solids
LAD, _e 'j is uniform when using the nozzle forms extraordi-I lent described above, which is also wear-reducing
; affects. ^;

'■ To produce the lance, the steel pipe 1 is first in the above
described manner with the wire mesh 2 cuff-like

I wrapped around. The reinforced steel pipe 1 is in a double shell
^ - 'shape introduced and centered. The mold and steel tube are installed vertically in an assembly frame so that the lance head is pointing downwards
indicates. The form with built-in and centered steel tube is placed on a vibrating table and firmly anchored there. The other end of the mold is loosely guided by devices on the assembly frame. Then the form is made with alumina refractory concrete
filled with vibration of the form. After the
The lance is molded from refractory concrete. It is then open regardless of the type of lance head at the pipe end 1a and can therefore already be used for lances without a nozzle head (FIG. 1).

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In lances with a nozzle head according to FIG. 2, the pipe end 1 a Solids distributor 7 pushed in and fixed in the position described above. Then the lower end of the steel pipe sealed with refractory concrete. Without heat treatment, the lance can be used no later than 24 hours after it has been removed from the mold.

SERVICE P.S _ ? 3 ΚΟΡΙΓ

I To produce the nozzle openings, the steel pipe 1 is in front of his ! Insertion into the form drilled at an angle from the outside. In these holes Shaped bodies 8 which determine the nozzle shape are then pushed in. to simply remove this molded body after the lance has been molded without damaging the surface of the nozzles, the molded bodies 8 are made of combustible, less porous material such as 'e.g. Made of wood and burned out after the lance has been shaped and before the solid material distributor 7 is installed.

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Claims (1)

SERVICE Protection claims: | 1. Lance for injecting fluidized substances into a molten metal, ; consisting of a coated with a refractory mass ; Steel pipe, which with increasing the adhesion of the refractory mass j wire is wrapped around it, 'n't that the wire is a high-tie wire mesh (2) I, which is placed around the steel pipe (1) like a sleeve, so that the refractory mass (4) is refractory concrete containing high alumina, and that the cover (5) of the wire mesh (2) approximately , 10 mm. ι
t i2. Lance according to claim 1, characterized in that the wire : fabric sleeve (2) through a twisted wire weft (3) ■ is closed. ; 3. Lance according to Claim 1 or 2 for blowing in fluidized fluid which releases only a little gas in contact with the molten metal ι materials, characterized in that the (_ i refractory casing (4) up to the end of the tube (1a) of the steel pipe (1) is sufficient, while the end of the wire mesh (2) from this pipe end (1a) has a distance (a) that of the Tissue cover (5) corresponds. 7613309 02.09.76 Lance according to claim 1 or 2 for blowing in contact with; fluidized substances which release a lot of gas from the molten metal, j characterized in that the lance! head is designed as a nozzle head with men; aren sideways through _; the refractory casing (4) guided in the nozzle openings _(6): and the pipe end (1a) closing Feststoffvsrtei- '■ ler (7), wherein the wire mesh fabric (2) to the pipe end (1a). is enough, which in turn is encased on all sides by the refractory mass (4). | '■ 5, S DlCNST f P-S Lance according to Claim 4, characterized in that the nozzle openings (6) towards the end of the pipe (1a) are inclined from the inside outwards get lost. : 6. Lance according to claim 4 or 5, characterized in that the
j lower edges (6a) of the nozzle openings (6) in the steel pipe (1) with
the top edge (7a) of the solids distributor (7). 7613309 02.09.76