DE102004054026B4 - Lance for introducing a particular gaseous medium into a liquid metal and method for the production - Google Patents

Abstract

lance for introducing a particular gaseous medium into a liquid metal, the one tubular body (2) through which the medium is conductive into the liquid metal and that of a refractory, with a reinforcement (1) provided material (8) is surrounded, wherein the tubular body (2) is not part of the supporting structure of the lance, by characterized in that the refractory reinforcement is the tubular body (2) immediately surrounds.

Description

The The present invention relates to a lance for introducing a particular gaseous Medium in a liquid Metal having a tubular body, through which the medium into the liquid Metal is conductive and that of a refractory, with a reinforcement surrounded material provided, as well as a method of manufacture such lances.

Such devices are used essentially in metallurgy and are for example from the DE 20 39 989 C2 and the GB 20 99 967 known. They are used, for example, in steelmaking, to supply the molten steel in the converter with oxygen. They usually consist of a steel tube, which is covered with a refractory protective layer for protection against very high temperatures.

The Steel tube carries while the entire construction. To improve the connection with the refractory sheath, the steel pipe is often with reinforcements provided, z. As angle steel, ribs, barbed wire etc.

Nevertheless have these lances due to the significant thermal and mechanical Loads only a relatively short life before being replaced Need to become.

It Therefore, the object of this invention is a lance of the initially described Kind available to make that a longer one Lifetime reached.

Is solved the task by an appropriate lance, which the characteristics of the having characterizing part of claims 1 or 2. In the dependent claims 3 to 8 are preferred embodiments described.

The Lance has according to the invention no internal Metal tube as a supporting element, in particular, the tubular body, through a medium is passed to the molten metal, directly from refractory Poured material.

The supporting component of the lance according to the invention is a reinforcement and / or the shell of refractory material. The reinforcement is preferably a spatial Structure cast in the refractory material. she consists For example, from a plurality of concrete ribbed steels, the can be connected to each other, for example through reinforcing rings, so that a cantilevered framework around the tubular Body arises.

By this construction advantageously the temperature-induced component voltages, with the same or better stability, significantly reduced compared to one continuous tube as a load-bearing component with a sheath fireproof material.

Furthermore offers the construction according to the invention improved protection against existing cracks in the Lances represent a weak point in the prior art. As the lance of the invention has no inner tube, occurs over a crack in the refractory shell the gaseous medium and keeps the molten metal away from the crack. The lance is so beneficial against the influences of the liquid Protected metal.

The Service life of a lance according to the invention is therefore higher as that of a lance of the prior art.

Preferably Between 2 and 12 parallel concrete ribbed steel strands form the Reinforcement, particularly preferred between 4 and 8 concrete ribbed steel strands. Prefers Make them a helical shape, creating a firmer bond is achieved with the refractory mass, which is advantageous in temperature Material expansion is.

Farther preferably protrude at the upper end of the lance that from the molten metal removed, the rebar strands of the refractory shell out. They are passed through a metal disc and connected to this, preferably above and below the disc welded with this.

The Rebar strands embrace the tubular body essentially concentric. The person skilled in the art understands that the rigidity the reinforcement is higher is, the closer the concrete rib steel strands on the outer wall the refractory sheath.

A not point-symmetrical arrangement, for example, from an odd Number of concrete ribbed steel strands, is also preferred since these are particularly advantageous with respect to Force absorption or the prevention of increased cracking are.

Farther Preferably reinforcing rings are provided which spiraled with the Rebar strands Preferably are connected internally and so form the Armierungskörper. Preferably, a reinforcing ring is provided every 100 mm to 500 mm lance length, is particularly preferred However, the distance between the reinforcing rings 200 mm to 300 mm.

Opposite one usual Lance with an inner tube made of steel are used for the reinforcement according to the invention only about 20% of the amount of steel needed, at least the same or higher stiffness the construction.

The Lance preferably has at least one outlet opening in the lower area Shape of a channel through the refractory sheath on the vertical down as an opening of the tubular body accomplished can be. Preferably, a plurality of such outlet channels are provided, the axially downwards and / or radially, so to the side, through the refractory layer led are, making a favorable Distribution of the medium in the molten metal is possible.

to Measurement of flow rate and / or flow rate and / or Pressure of the medium, a connection option for a corresponding meter is provided. This makes it possible, conclusions about the flow parameters to pull the state of the lance and so the timing very accurately determine to which the lance needs to be replaced.

According to the invention the lance no inner tube with supporting function. However, it is preferably possible, that over for example a subsection of the lance an inner tube runs, no carrying function fulfilled. In particular, it is not associated with the cantilever armor. Especially Prevents or controls such a pipe, without supporting function, for example, the radial gas outlet from the lance.

One Another object of the present invention is a method for producing a lance according to the invention for introducing a particular gaseous Medium in a liquid metal, the one tubular body that of a refractory, provided with a reinforcement Material is surrounded, available to deliver.

This succeeds by the tubular Body at to water of the refractory material as a recess by a not with the Reinforcement connected placeholder is formed, at least so stable is that it absorbs the forces occurring during casting can.

The Production of the lance according to the invention done by pouring the refractory mass in a mold. The reinforcement according to the invention, for example made of concrete rib steel strands and reinforcing rings is poured in this process usually with. A steel bearing tube connected to the reinforcement, does not become according to the invention used. The tubular body becomes Instead, preferably shaped by a placeholder, the first with is poured. This must be at least so stable that he forces the casting the refractory mass occur, can absorb.

There the placeholder preferably keeps the inner diameter of the tubular body free comes the corresponding wall thickness the refractory sheathing steel tube to good, giving the heat resistance increase favorably can. Likewise could Also, the diameter of the lance reduced by the same amount be, which also advantageous a saving in refractory Mass, weight and volume would result

Preferably are called placeholders so-called pour spikes for forming the tubular hollow body, as well as for the formation of the outlet channels used after the casting process removed again and later Casting again be used.

Also Preferably, however, the placeholders remain in the finished cast Lance. They are made in this case, for example, from such a material, that when drying the refractory material or at the latest melt off at the first use of the lance.

The Process is less expensive, as the removal of reusable spines and the residues affect the function of the lance not.

One Another advantage of the production of lances without internal, load-bearing Pipe, that is drying the refractory mass over a larger surface, namely inside and outside, takes less time.

following The present invention will be described with reference to drawings of an embodiment explained. The designs refer to the manufacturing process as well as to the Lance itself. They are exemplary and limit the general character the invention is not.

1 shows a lance according to the invention in side view and plan view.

2 makes a longitudinal section through the lance accordingly 1 represents.

3 shows a cross section of the lance 1 ,

In 1 is a side view of a lance for introducing a particular gaseous medium is shown in liquid metal. In addition, a plan view is shown, which illustrates that the Lan ze is substantially cylindrical.

Below the metal disc 4 is the actual lance with the indicated tubular body 2 and the shell of refractory material 8th to see.

Above the disc 4 is the supply lines for the medium, in which also the connection 7 is arranged for a measuring device.

Also indicated is the reinforcement 1 made of concrete rib steel strands 3 and reinforcing rings 5 , which recognizes a kind of cage around the tubular body 2 form. The concrete rib steel strands 3 are at their upper end by the metal disc 4 passed through and welded with this on both sides.

In the lower part of the illustration are three outlet channels 6 represented, which are evenly distributed on the circumference.

2 makes a section along the line AA 1 dar. At the top of the supply line is a connecting piece 7 for a measuring device. To recognize. In the cut representation is only one of the rebar strands 3 to see what the helical shape is clearly visible. Likewise the passage through the metal disc 4 at the upper end.

The reinforcing rings 5 surrounded at constant intervals the tubular body 2 , This is directly through the refractory material 8th formed that surrounds him.

In the present embodiment, the exit channels run 6 in an angle slightly inclined downwards from the horizontal.

In 3 , a cross section along the line BB 1 , is the relative location of helical concrete rib strands 3 , the reinforcing rings 5 , as well as the tubular body 2 and the outlet channels clearly shown. The reinforcing rings 5 lie within the through the concrete rib steel strands 3 formed circle

1

reinforcement

2

Tubular body

3

Rebars

4

metal disc

5

reinforcing ring

6

outlet channel

7

connection for measuring device

8th

Fireproof material

Claims (11)

Lance for introducing a particular gaseous medium into a liquid metal, which is a tubular body ( 2 ), through which the medium is conductive into the liquid metal and of a refractory, with a reinforcement ( 1 ) provided material ( 8th ), wherein the tubular body ( 2 ) is not part of the supporting structure of the lance, characterized in that the refractory reinforcement of the tubular body ( 2 ) immediately surrounds. Lance for introducing a particular gaseous medium into a liquid metal with a recess ( 2 ), through which the medium is conductible into the liquid metal and that of a refractory, with a reinforcement ( 1 ), material ( 8th ), characterized in that the recess ( 2 ) is poured directly from the refractory material. Lance according to claim 1 or 2, characterized in that the reinforcement ( 1 ) and / or the refractory material is the supporting structure of the lance. Lance according to one of the preceding claims, characterized in that the self-supporting reinforcement ( 1 ) a plurality of helical rebar strands ( 3 ) parallel to the tubular body ( 2 ), are arranged concentrically around this and at its upper, the molten metal facing away from the end by a metal disc ( 4 ) and with this, preferably both sides, are welded. Lance according to claim 4, characterized in that the self-supporting reinforcement ( 1 ) several reinforcing rings ( 5 ) having the tubular body ( 2 ) and the concrete ribbed steel strands ( 3 ) are connected. Lance according to one of the preceding claims, characterized in that the medium through one or more outlet channels ( 6 ) pointing vertically downwards and / or radially through the refractory material ( 8th ), can be led out of the lance. Lance according to one of the preceding claims, characterized in that a connection possibility ( 7 ) is provided for a measuring device, with the pressure, flow rate, or flow rate of the medium is measurable. Lance according to one of the preceding claims, characterized in that within the tubular body ( 2 ) A metal tube is arranged. Method for producing a lance for introducing a particular gaseous medium into a liquid metal, which has a recess ( 2 ) which comprises of a refractory, with a reinforcement ( 1 ) provided material ( 8th ), characterized in that the recess ( 2 ) when casting the refractory material ( 8th ) is formed as a recess by a not connected to the reinforcement placeholder, which is at least so stable that it can absorb the forces occurring during casting. A method according to claim 9, characterized in that casting mandrels as a placeholder for forming the recess ( 2 ) and / or the exit channels ( 6 ) are introduced into the mold, which are removed after the casting process again. A method according to claim 9, characterized in that the placeholder for forming the recess ( 2 ) and / or the exit channels ( 6 ), which are introduced into the mold, during the drying of the refractory material ( 8th ) and / or melt and / or burn on first use.