DE1993035U - LANCE, IN PARTICULAR OXYGEN LANCE. - Google Patents

Description

PATENT LAWYERS

DR. ING. KARL BOEHMERT

DlPL-ING. ALBERT BOEHMERT

28 BREMEN, FELDSTR. 24

(0421) 4917 00

ü New registration.
- DAY! AlTD UiHl ¹ ED ...

D 7? 2. ■■ - ': -' ■ .. ". 28. Jtinx 1968

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'DAVT MD UMlIED EHGIKEEHIWG CCMPAEX LIMITED, Darnall .-. ■ ■■ Works, Sheffield 9? County ■■ Yorkshire (Great Britain)

Lance j in particular oxygen lance .....

The present invention relates to lances, namely especially those lances like those used for blowing τοπ Oxygen or another gas on the surface a bath of molten metal are used,

In many steel-making processes, oxygen is used to refine high-grade steel to steel; so-oxygen tuyeres, for example, in open-hearth furnaces passed through the covers or side walls of the ovens and inflated oxygen onto the bath of the molten metal .. In all of J ¹ converters which

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are blown from above, the jjanzen through the; Converter opening introduced. In "both cases arise Problems due to the fact that the large momentum of the oxygen jet acting on a limited area of the bath a splash and ejection sovri.e instead of a steady reaction rate; ; causes fluctuating reaction speed. .-. ■■ "'■ -

As an attempt to overcome these disadvantages, it has already been proposed that a number of separate openings be made at the end of the lance. ■ -. den, so that the oxygen is distributed over a larger area of the melt than it. would be possible with a simple opening. - - '- -; ■. ". ' \.

Be openings such üblicherweiS: e: by one, block drilled through solid copper "'wherein the -.:.: Block in use of the lance © is water cooled, the cooling is with these known Xanzenkonstruktlohen 3 ed och insufficient, so that the. The wear is great and the service life of the openings is reduced. In addition, the area over which the oxygen is distributed is still limited and the openings are not adjustable. '■':. ■ - "-: '■ - .-. - -, ■■ "-.-.: '.-.- .. .'.- ■■■■■ _:

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In contrast, the present invention provides a lance, for inflating a gas on the surface of a bath of molten metal before, - of which the 'gas in one.' essentially annular stream is emitted »a such lance may have an annular opening defined by diverging inner and outer tubes is between which the gas flows out; and the inner ones and outer bores can be axially adjusted to each other be, whereby the divergence and the cross-sectional area the outflow opening is variable. - ■ '-. "".

The lance can have an inner and a likewise cooled with a liquid or gaseous medium -; . have cooled outer jacket, between which a channel for the gas is formed. .. _: "'■; .V. -Y

The inner jacket may be an outer tube of circular shape Cross-section and have a closed end. Inner, ' half of the outer tube can be concentric and with Ah-; ■ stood from the outer tube as well as from its closed: end an inner tube was arranged around a passage for the flow of the cooling medium - to form * ...

The outer jacket can include concentric inner and outer tubes spaced from one another:

and are connected at their ends. At a distance from this connection point and from the concentric bores, a guide tube is provided between these tubes in order to obtain a passage for the flow of the coolant. - - - · _:.

The bores of the inner jacket can be connected to one another at the end that corresponds to the. . Discharge end of the lance corresponds: to is set, the outer drill and the guide tube whereas the outer shell together at one ^point:; are connected, which lies between the ends of the lance.

The guide tube is preferably detachable from the inner tube of the outer shell and the inner tube of the outer shell is detachable and adjustable with. the outer -; Bohr of the inner jacket connected, the inner and the outer jacket are axially adjustable to each other * =.

The invention is described below with reference to an exemplary embodiment and in the drawings beisplels-: wisely presented, it show:. :

I ¹ Ig "1 is a partially sectioned side view

the lance; -. . ---.--- - ". '■ ^:

FIg. 2 a view of the lance in the direction of the arrow II in Kg. I ₅ with some ./■ '. Parts omitted; ^ and '.-'._ ■ "'■" . -

l "ig. 3 is an enlarged view of the termination portion of the J in ¹ Ig. 1 gseigten lance,

The lance includes an outer jacket 10 and an inner jacket 12. which are arranged concentrically one inside the other, with an annular length between them _; Channel 14- for; to "form the passage of a gas such as oxygen... ..... -

The outer jacket 10 comprises concentric tubes 16 .and 18, the ends of which are connected to one another by means of a diverging end part 24- and which have between them a guide tube arranged at a distance from them; 20: which ends at a distance from the end part 24- »the guide tube 20 accordingly divides the outer jacket 10 into separate inflow and outflow channels for the circulation of a coolant. The inner niantel 12 is of a diverging closure ^; part 26 closed and contains another conc. "trical tube 23, the front end of which is arranged at a distance from-. the termination 26; accordingly, a coolant in the tube 23 can be fed to and returned between the tube 23 and the jacket 12 .. Ea can be seen, that the diverging closure parts 24, 26 in this way form a diverging outflow opening for the oxygen flowing along the channel 14... " . -. -.

The oxygen gets into the ring-shaped channel from one Torrat, not shown, via a line 28. trains - "-." ■ leads, which is connected to a tubular piece 30, which is in turn connected to the pipe 18 by means of a sleeve 32. ■■ '.: ■ - ■

The coolant supply for the outer jacket 10 runs via a line 34- which is connected to a pipe section 36, so that the coolant flows through the inner channel and back through the outer channel. through an outlet line 40. The pipe section 36 is connected to the guide pipe 20 by means of a sleeve 42, and the pipe section 38 is connected to the pipe 16 by means of a sleeve 44. ■ .. -. ■ ".. '" ■■ - "..-"; ■ .'.- '.-.'.. ^: "". -

The coolant supply to the inner jacket 12 also runs from the line 3 ^ ₅ , the medium flowing through a number of lines 58, which are connected to one another with the aid of couplings 56. 3? For the scheme. ' the coolant supply of the inner jacket 12 is a valve 60 is provided. The medium flows in this! 'All. back in the pipe and between the pipe 23 and the jacket 12 and flows through the pipe piece. 50 5 to xiFelchem. a line 48 is connected j which in turn with the help of a series of couplings49 with the return flow

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line 40 "is connected, Das. Eohrstück ^ O is at the jlantel 12 with the help of a sleeve, 54 -connected.

The inventive lance is designed so that the ■ given amount of oxygen and the Pläche.auf _■: melt to which the oxygen is distributed, can be adjusted to provide the desired effect to achieve metallurgical /. For this purpose, an annular plate.64 is welded to the socket 54 of the earpiece 50 and provided with two diametrically opposed holes through which two threaded rods 66 are guided : Second bing plate 68, which is attached to a! Plansch 70 ". Two nuts 72 are screwed onto each end of the rods 66. An annular plate 7A- is provided with an.- axially -..- extending projection 76 which into a The recess in the recess 70 engages, with the plate 7 ^ZjL -'- and the recess 70 being held in their mutual setting by means of studs 78 and nuts 80 *. In the recess of the recess 70 there are split sealing rings 82 provided .-, - to prevent the oxygen from leaking out of the drill bit JO- .; ^v ■ ■;

For adjusting the divergent end parts of the fiing canal 14 the nuts 42: on the threaded rods; 66

solved and the flange 70 then in the desired Position pushed. Such a movement of the;. Flange 70? Ri.rd accordingly the tubes 16, .18 of the -. Outer jacket 10 together with the conduit 20 in move in the axial direction relative to the inner jacket 12. Then the nuts 72 are attached. pulled to hold the outer jacket 10 in the desired position. ■:

In order to move the lines 48 ₅ 58 za _; enable sliding door connections are seen, of which only one is visible in the drawing; *. .

In order to facilitate the replacement of the end parts 24 of the outer jacket 10, a stuffing box 85 is provided. The gland 85 includes a flange 86 which has an axially extending recess into ¥ / ELCHEM split seal rings are provided 89 to ^1, to prevent the iecken Eühlflüssigkeit on the fiohrstück J6. The sealing rings 89 are in their position from an axially projecting part. 88 of an Einplatte 90 held on the flange. 86- is fixed with the help of studs 92 and nuts 94 «

When it is required ■ which: Abschloßt express remove 24, the weld 25, which the closing part 24 with ■ is: -_ ■ connects the tube 16 is removed and will be the flanges 49, 56 of the cooling agent is a · - and outlet lines. 34, 40 solved. Then the nuts are: 94 on the. ^: ; ; . Screws 92 loosened ,,. to the on one. Plate LOO pressing sealing rings 89 to release.

Once these connections like; described above, are separated, the tube 16 and the guide tube 20 with their associated parts can be moved relative to the tube 18 and to the inner jacket 12 in an axial view (in the drawings - to the left), the axial. Move; by the . Slipping of the stuffing box 85 on the plate 1.0ö _: poss-- - ':,' ■■ "._.: - is borrowed. This movement is continued until the weld point 27, which connects the end part 24 with the pipe 18 connects, appears at the end of the guide tube 20 thereon ~ - 27 removed ^ ^as closing part. 24 'the -Schweißstelle can.';. withdrawn and a new end part to be inserted .24, -, - / wherein the preparation of the new Yerblndungen in ^..;;; reverse is happening....

It can be seen that with the according to the invention. Lance. "., -" ■ the Pdngraum, through which the oxygen the lance; leaves, . adjustable to a previously determined 'value, whereby. the flow rate of oxygen is regulated, and the mesh, to which the oxygen is distributed is determined.

Claims (1)

RÄ.V01635 * 7/11/68 -A η s ρ r ü c h e 1 »Lance for blowing a gas onto the surface of molten metal, characterized in that the gas in an essentially ring-shaped stream _ is delivered »Λ. . - 2 * lance according to claim I ₃ , characterized by an annular gas discharge opening, \ ■ 3 * lance according to claim 2, characterized in that the annular Ausittsöff ^ Lung (14) iron diverge: the inner and outer tubes (TO, 12) is formed. 4 “Lance after. Claim 3 _5, characterized in that the diverging inner and outer tubes (TO, 12). are axially adjustable to each other. \ _: ;. 68/03 ■ .... · - .. ^■:: ■ ■■■■ .. ..: - 5, lance according to claims 1 to 4-, characterized _y ; through an inner jacket (12) cooled by a coolant and one of. a coolant-cooled outer.;, jacket (10), which between them the channel. (14 ·) form for the gas,. . . . . : 6 »Lance according to Claim 3, characterized in that the inner jacket (12) has an outer shell that is round in cross section. pipe, comprising concentric and spaced from the outer closed end and an inner tube _(23). angeordnet- tube as well as of the closed end "- .. is to form a passage for the flow of coolant · -. 7 »Lance according to claim 5 or 6, characterized in that the outer jacket (10) has inner and outer tubes (16, 18) arranged concentrically and at a distance from one another. which are sealed against each other at their ends, and a guide tube (20) which is spaced from the concentric ears (16, 18) and from which at the end _; Sensitive sealant is arranged to form a passage for the coolant flow *. . . : - [ 8 »Lance according to one of claims 5 to 7 ■> characterized in that the ears. of the inner jacket (12) are connected to one another at the end which is opposite the discharge end of the lance » - ': ■. : ν ■ ■ -3 9 »Lance according to claim 7 or 8, characterized ;, that the outer tube (16) and the guide tube (20) of the outer jacket (10) are allied to one another in one place, '. which lies between the ends of the lance. . V 10. Lance according to claim 9, characterized in that the guide tube (20) detachably with the inner tube (18) of the Outer jacket (10) is connected. .-..- ' 11 * Lance according to claim 10, characterized in that the inner tube (18) of the outer jacket (10), detachably and adjustable, is connected to the outer tube of the inner jacket (12) in such a way that the inner and outer jacket are axially relative to one another are adjustable. ; _: . ..