LANCE AND METHOD FOR DETERMINING REACTION DATA OF THE COURSE OF A REACTION

Abstract

A lance and a method determine reaction data of the course of a reaction, in which a reaction gas is top-blown by at least one lance onto a metallic melt in a metallurgical vessel and measured data are determined in this way, reaction data for the course of the reaction are determined as a function of these, where the lance for determining measured data blows out a gas which is conveyed separately from the reaction gas through at least one outlet opening of at least one measuring conduit. The lance for determining measured data blows out the gas which is conveyed separately from the reaction gas laterally through at least one outlet opening of at least one measuring conduit and the internal pressure of at least one gas bubble of this gas formed at this outlet opening of the respective measuring conduit is measured.

Claims

1. Method for the determination of reaction data of a reaction sequence, in which a reaction gas (4) is top-blown by means of at least one lance (1) onto a metallic melt (3) in a metallurgical vessel (2) and simultaneously measured data are recorded, as a function of which reaction data about the reaction sequence are determined, wherein the lance (1) for the recording of measured data blows out a gas being conveyed separately from the reaction gas (4) via at least one outlet opening (12, 13) of at least one measuring line (9, 10), wherein the lance (1) for the recording of measured data blows out the gas being conveyed separately from the reaction gas (4) laterally via at least one outlet opening (12, 13) of at least one measuring line (9, 10), wherein the internal pressure of at least one gas bubble (14, 15, 19) formed at this outlet opening (12, 13) of the respective measuring line (9, 10) is measured.

2. Method according to claim 1, wherein the lance (1) blows gas out laterally via at least two measuring lines (9, 10), wherein reaction data about the reaction sequence are determined as a function of an establishment of the difference between the measured internal pressures of the gas bubbles (14, 15, 19).

3. Method according to claim 2, wherein measuring lines (9, 10) discharging at the same lance height form gas bubbles (14, 19) differing in size from one another.

4. Method according to claim 2, wherein measuring lines (9, 10) discharging at different lance heights form equally large gas bubbles (14, 15).

5. Method according to claim 2, wherein measuring lines (9, 10) discharging at different lance heights form gas bubbles (14, 15, 19) of different size.

6. Method according to claim 2, wherein the measuring lines (9, 10) blow out gas on opposite sides (21, 22) on the lance body (11), especially diametrically oppositely on the lance body (11).

7. Method according to claim 1, wherein measuring line or the measuring lines (9, 10) is or are simultaneously cooled by the cooling medium that cools the lance.

8. Top-blowing process, in which its reaction sequence is controllable or adjustable on the basis of reaction that are determined by means of a method according to claim 1.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0028] As an example, the subject matter of the invention is illustrated in more detail on the basis of an alternative embodiment in the figures, wherein

[0029] FIG. 1 shows a cutaway side view of a device for the determination of reaction data and

[0030] FIG. 2 shows a detail view of FIG. 1.

DETAILED DESCRIPTION OF PREFERRED EMBODIMENTS

[0031] According to FIG. 1, a lance 1 is illustrated that is dipped into a metallurgical vessel 2, which contains a metallic melt 3, for example a ferrous material, an aluminum material, a metallic alloy or the like. The lance 1 is used to top-blow a reaction gas 4 onto the melt 3, in order to set a metallurgical reaction sequence in motion in this way. Such a reaction sequence may be, for example, a refining of pig iron with oxygen, which is known as the LD process. To be able to withstand the loads caused by the reaction sequence, the lance 1 is equipped with a cooled outer lance jacket 5. Such a cooling may be created, for example, by a double-walled construction of the lance jacket 5 that conveys water as coolant, although for clarity this is not further illustrated in the drawings. The gas supply 7 of the reaction gas 4 of the lance 1 is discharged in the bottom end of the lance 1 via an opening 8 or a plurality of openings, not illustrated in more detail, of the lance jacket 5, and flows onto the melt 3. It goes without saying that any opening shape or number of openings 8 is conceivable.

[0032] The lance 1 has at least one—in the specific exemplary embodiment two measuring lines 9 and 10—which is provided in the lance body 11 in a manner protected from the influences of the top-blowing process. According to the invention, these measuring lines 9 and 10 discharge in at least one outlet opening. In the example, two outlet openings 12 and 13 are provided on the lance jacket 5, disposed laterally or alongside, of the lance body 11. The outlet openings 12 and 13—constructed as bubbling openings—generate gas bubbles 14 and 15, which can be seen better in FIG. 2. These gas bubbles 14 and 15 stream into the foamed slag 16, which is formed above the melt 3 as a result of the metallurgical reaction sequence. With a measuring line 20, which with sensors 17 and 18 records measured data about the respective pressure of measuring lines 9 and 10 and thus also about the internal pressure of the gas bubbles 14 and 15 at the respective outlet opening 12 and 13, it is now possible to infer reaction data of the reaction sequence or to determine these therewith accurately and rapidly. Thus a slopping, which is known to be undesirable in top-blowing processes, can be detected in timely manner—subsequently the top-blowing process is advantageously adjustable and controllable on the basis of the reaction data recorded in this way.

[0033] Since two measuring lines 9, 10 are provided in the lance body 11, the measurement or the determination of the reaction data can be undertaken considerably more accurately by a measurement of the difference between their internal pressures. Such difference measurements are known, for example, in “gas blowing processes” of the prior art.

[0034] In order to ensure the establishment of a sufficiently large difference, the outlet openings 12 and 13 of the two measuring lines 9 and 10 end at different heights laterally on the lance jacket 5.

[0035] As can be seen in particular in FIG. 2, it is also conceivable that these outlet openings 12, 13 discharge laterally at the same height on the lance jacket 5 and have different outlet cross sections, in order to generate gas bubbles 14 and 19 of different size in this way.

[0036] It goes without saying that a combination of different heights of the outlet openings 12, 13 with various outlet cross sections is conceivable. However, this is not illustrated in more detail.

[0037] In addition, the measuring lines 9 and 10 are in thermally conducting communication in their outlet zones with the cooled lance jacket 5, in order to cool these measuring lines 9 and 10 simultaneously with the lance jacket 5 and thus to ensure reproducible process conditions for the bubbling of gas 14, 15, 19 into the foamed slag 16.

[0038] Advantageously, it is further provided that the outlet cross sections 12, 13 of the measuring lines 9, 10 discharge on opposite sides 21, 22 on the lance body 11. In this way the bubbling of gas 14, 15, 19 is highly independent of one another—especially when the outlet openings 12, 13 of the measuring lines 9, 10 are disposed diametrically oppositely on the lance body 11. Thereby the measurement accuracy is considerably improved.

[0039] In general, it is pointed out that—as may be inferred from FIGS. 1 and 2—the measuring lines 12, 13 discharge respectively on different sides 21, 22 or alongside the lance body 11, although this does not necessarily have to be the case. In addition, a combination of different heights of the outlet openings 12, 13 with various outlet cross sections is also conceivable here—although this is not illustrated in more detail.