DE3543836C2 - - Google Patents

Description

The invention relates to a method for cooling two each in the blowing position blow lances that can be brought during the metallurgical treatment.

The uninterrupted blowing process control is made possible by two mutually alternating blowing lances, so that one of these two lances constantly inside the molten metal for the purpose of carrying it out of the metallurgical process can stop while the other lance is on hold outside the molten metal and in the required Trap can dip into the molten metal within a few seconds, all the more the lance, which may be shown as destroyed, has been inside until then the molten metal is detached, so that the blowing process is uninterrupted to be able to continue.

The main cause of the premature destruction of the blow lances and thus the premature termination of the metallurgical process is usually the temperature-related destruction of the z. B. enveloped with refractory material and so protected blow lance body.

Further blow lance protection measures are e.g. B. also cooled double jacket the blow lance constructions.  

When using blow lance systems in the already known versions (e.g. German Patent No. 23 03 978 - device for insertion of fine-grained treatment agents in molten steel) results in a number of difficulties, especially for reasons of unsatisfactory lance durability (Downtimes).

The invention has for its object methods for cooling blowing lances of the known type to improve that in the event of a blow lance being destroyed, that the operation of the plant continues uninterrupted to interrupt the Blowing process and the associated harmful premature temperature drops to prevent the molten metal.

The object is achieved according to the invention by the characterizing features of claim 1.

The water cooling only starts at the moment when the relevant one Blow lance has already left the pan and is above that of Slider separate pan is located.

While the blowing lance is in the cooling position using cooling water is cooled back, the other blowing lance is in the blowing position and is now cooled by air in the cooling channel through which water flows or an inert gas.

The cooling of the two blowing lances described in this way, that is to say cooling by means of air, (or inert gas) of the blowing lance in the blowing position and cooling by means of water  the blowing lance is in the cooling position alternating and in time, whereby the cycle time is controlled through an automatic (provided within the blowing lance) table temperature monitoring.

The length of the cycle time is always predetermined by the max. permissible temperature on the metal jacket of the blowing lance. These Procedure prevents an impermissibly high temperature the metal parts of the blow lance.

The two mutually working blowing lances are included equipped with a spare blower, the required if the full function of the main blowing lances in seconds can take over quickly. You can also use these two Spare blowing lances also fully involved in the blowing process be drawn. This can be to shorten the cycle times be used, or to shorten the duration of each single lance while maintaining the cycle times what leads to a further extension of the blowing lance service life.

The management of the metallurgical process is in this Twin blowing lance system significantly improved by the measuring lance system integrated in this system. The work This measuring lance system is coupled to the work process of the twin blowing lance system and fully automatic controlled.

The vessel with the hot liquid metal to be treated is turned into an outside for the purpose of metallurgical treatment brought closed housing.

This housing is constructed to protect against noise - and also the housing by means of a suitable device dusted so that no noise and Dust nuisance occur.

An embodiment of the invention is as follows hand of the drawing explained in more detail.

It shows:

Figure 1: Blow lance system for metallurgical treatment and process for uninterrupted blowing process control

Image 2: The same in plan view.

In Figure 1 and 2, the lance 1 in the cooling position, at the same time the lance is (marked invisible in figure 1) 2 is shown in blow position.

The blowing lances are supplied with water or air / inert gas from the cooling station 4 .

The guide column 3 rotates, if necessary, the respective reserve blow lance 21 in the working position.

Figure 2 shows the spare blowing lances in the rest position and blowing lances 1 and 2 are shown in the cooling and blowing positions.

The respective blowing lance travels with a carriage 23 on the guide column 3 by means of a lifting mechanism in the blowing position 2 and up in the cooling position 1 . The parallel to the blowing lances guide column 6 of the measuring lance also rotates this measuring lance in standby 10 or in Mani pulierposition 9 (each time a new measuring probe is drawn up). The measuring lance moves into the measuring position 22 in a manner similar to the blowing lance via a lifting mechanism 5 .

Further blow lances are kept ready for replacement in magazines 19 . For the measuring lance, a probe magazine contains 18 measuring probes, which are automatically drawn onto the measuring lance by a probe manipulator.

The bunkers 7 for the metallurgical treatment agents are connected to the blowing lances via fixed pipelines and flexible feed hoses. A slider 11 separates the respective blowing lance in the cooling position from the container to be treated. The encapsulated treatment station 13 (noise and dust-proof housing) contains the container 16 to be treated with a lifting and lowering container lid 14 with a funnel 15 for aggregates and connected dust and gas extraction device 12 .

Claims (4)

1. A method for cooling two blow lances, each of which can be brought into the blow position during the metallurgical treatments, in particular ladle treatment, of a metal melt, characterized in that the blow lance in each blow position is periodically cooled by means of air or an inert gas, while the other blow lance in each case is outside of the treatment tank is located and is water-cooled there, and that it is only switched to water cooling when the blowing lance has left the treatment vessel and is above the treatment vessel separated by a slide. 2. The method according to claim 1, characterized, that the lance moving into the molten metal with a gaseous cooling medium, preferably inert gas, is applied for cooling. 3. The method according to claim 1 and 2, characterized, that a resilient blow lance pickup that vibrations due to the blowing process (Vibration) compensated and not on the entire system can act. 4. blow lance plant for metallurgical treatments, especially for metallurgical ladle treatments with one, in the one filled with hot metal Lowerable blowing lance according to claim 1 to 3, characterized in that  a reserve lance for each of the two blowing lances Is ready, which if necessary in a matter of seconds positioned in the position of the normal blowing lances can be.