KR101037163B1 - Apparatus for preventing and removing a sticked molten steel on main lance of converter - Google Patents

Abstract

The present invention relates to a converter lance for blowing in the steelmaking process is installed to be detachable to the outer circumferential surface of the lance pipe for supplying oxygen for the converter blown, the release tube made of a material that prevents the current attachment; And a plurality of separate heating plates fixedly spaced apart from the release tube to be separated by heating the part of the band attached to the outside of the release tube, wherein the release tube has a polygonal outer shape of a cross section. Provided is a polygonal shape converter lance now preventing and removing device characterized in that the form.

Converter, Lancepipe, Now, Now Band

Description

Polygonal converter lance attachment prevention and removal {APPARATUS FOR PREVENTING AND REMOVING A STICKED MOLTEN STEEL ON MAIN LANCE OF CONVERTER}

The present invention relates to a lance for blowing a steelmaking process, and more particularly, to prevent the attachment of a scalpel to a lance that injects a high pressure and a high flow rate of oxygen in a converter blowing process during a steelmaking process, The present invention relates to a converter lance now prevention and removal device of the polygon shape improved for easy removal.

1 is a cross-sectional view of a converter for blowing a steelmaking process. Referring to FIG. 1, in the converter blowdown process of steelmaking refining process, high-pressure, high-volume oxygen is injected through a lance pipe 3 for a predetermined time to oxidize and remove carbon, silicon, and phosphorus contained in molten iron. have. Lance pipe (3) is composed of a steel pipe (Steel pipe) of the triple structure in order to endure at high temperature, the gas is supplied to the center and the cooling water flows in the outer portion.

The high pressure oxygen jet jetted through the lance pipe 3 having such a structure hits the surface of the melt and scatters a large amount of molten iron and converter slag, and the scattered molten iron and converter slag are attached to the lance surface. It solidifies or flows down. Among the molten iron and converter slag attached to the surface of the lance, even if the converter slag is attached to the lance, it is easily separated from the lance by peeling off after cooling. However, in the case of molten iron, once attached to the lance (hereinafter referred to as "now"), it is not only difficult to separate, but also once attached to the lance, the molten iron is more easily attached to the next use and the number of times of lance use increases. As a result, the amount of sticking now increases, eventually leaving the lance unusable.

There are two ways to prevent the attachment of the converter lance and the present invention to suppress the scattering of molten iron or slag itself or to prevent it from adhering to the lance surface even if molten iron or slag is scattered.

In the former case, the oxygen flow rate, the shape of the nozzle, the distance to the hot water surface, and the like can be achieved to some extent, but it is virtually impossible to completely suppress the scattering itself as long as oxygen is injected.

In the latter case, there is a method of suppressing quenching or changing physical properties of the lance by increasing the cooling capacity of the lance and reducing the surface temperature in order to prevent sticking to the lance surface.

As a method for increasing the cooling capacity, it is possible to increase the heat conduction effect of the cooling water by reducing the thickness of the pipe outside the lance, or to increase the cooling water flow rate by increasing the capacity of the cooling water pump. In addition, the effect of inhibiting adhesion is also not satisfactory.

As a method of changing the lance surface properties, there is a method of applying a ceramic-based refractory component (alumina, boron, silica, etc.) to the surface. In other words, a thin chromium film is formed on the surface of the lance by chrome coating to increase the release property. However, since the length of the lance is usually 20m or more, the chromium coating itself is not easy, and there is a disadvantage in terms of cost even when specially manufactured.

Unlike these methods, there is a method of forming a thin film by simply applying a release product and then drying it, but since the interfacial strength between the lance shell and the release product is weak, peeling easily occurs, and thus it is not a satisfactory method.

In addition to these methods, there is a device for installing a mechanical device on a lance dome to scrape the current attached when the lance is raised. However, only slag can be easily scratched, and once the molten iron is sintered, it is almost ineffective.

The present invention was created to solve all the problems of the prior art as described above, the outer side of the release tube and the release tube made of a polygonal cross-sectional shape so as to be detachably installed on the outer circumferential surface of the lance pipe to prevent the current attachment It is an object of the present invention to provide a polygonal converter lance preventing and removing device, which is fixed to be easily installed on the present invention, to easily prevent or remove the converter lance by means of a plurality of separate heating plates that are easily removed. do.

Polygon-shaped converter lance now preventing attachment and removal of the present invention for solving the above problems is installed to be detachable to the outer peripheral surface of the lance pipe for supplying oxygen for the converter blown, made of a material that is prevented from sticking now tube; And a plurality of separate heating plates fixedly spaced apart from the release tube to be separated by heating the part of the band attached to the outside of the release tube, wherein the release tube has a polygonal outer shape of a cross section. It is characterized by the form.

The converter lance attachment prevention and removal device is characterized in that it further comprises a resistance heating element electrically connected to the separation heating plate to heat the separation heating plate. The release tube is preferably made of a ceramic material.

The release tube may be configured to be connected to a plurality of polygonal tubes made of a material that is detachably installed on the outer circumferential surface of the lance pipe for supplying oxygen for the converter and is prevented from being attached. At this time, the separation heating plate is characterized in that the fixed intervals to the outside of each of the polygonal tube.

In addition, the release tube may be a polygonal shape is formed by combining two polygonal structure consisting of a polygon separated in half.

The converter lance now preventing and removing device further comprises a lower fixing tube fixed to the lower end side of the lance pipe, and an upper fixing tube fixed to the upper end side of the lance pipe, the release tube is the It is installed between the lower fixing tube and the upper fixing tube is characterized in that it is fixed up and down by the lower fixing tube and the upper fixing tube.

According to the polygonal converter lance preventive attachment and removal device of the present invention, it is possible to obtain the effect of preventing the attachment of the converter lance by a release tube made of a ceramic-based material provided on the outer peripheral surface of the lance pipe. At this time, the cross-sectional outer shape of the release tube is made of a polygonal shape to separate the now formed band formed in the release tube, thereby reducing the mechanical compressive load of the now band can be easily removed now.

Also, the separation heating plate fixedly installed on the outside of the release tube distributes the mechanical compressive load of the band now, and by removing the part of the band now by heating the separation heating plate, it is easier to remove the current attached to the release tube. It becomes possible.

Therefore, the excessively attached to the converter lance surface can be easily removed to reduce the working time by preventing the current, it is possible to efficiently operate the operation, thereby maximizing the production efficiency.

Hereinafter, with reference to the accompanying drawings it will be described in detail a device for preventing the converter lance attachment and removal of the polygonal shape of the present invention.

2 is a top and bottom cross-sectional view of a polygonal shape converter lance attachment prevention and removal device according to an embodiment of the present invention, Figure 3 is a horizontal shape of a polygonal converter lance attachment prevention and removal device according to an embodiment of the present invention It is a cross section.

Referring to Figures 2 and 3, the polygonal shape converter lance now preventing and removing device comprises a release tube (4), and a separate heating plate (7).

The release tube 4 is manufactured by molding a refractory component at a predetermined ratio so as to prevent the current attachment, and is detachably installed on the outer circumferential surface of the lance pipe 3. The release tube 4 is made so that its inner diameter is the same as or slightly larger than the outer diameter of the lance pipe 3, the outer shape of the cross section is made of a polygonal shape. The release tube 4 is preferably in terms of durability to form an average thickness of 1mm or more.

In the installation of the release tube 4, the lower fixing tube 6a is fixed to the nozzle portion on the lower end side of the lance pipe 3, and then the release tube 4 is installed on the upper portion thereof, and the upper fixing tube 6b is lanced again. It is carried out by clamping the pipe 3 on the upper end side. As a result, the release tube 4 is fixed up and down by the lower fixing tube 6a and the upper fixing tube 6b.

The release tube 4 is preferably made of a ceramic-based material, in order to prevent it from being attached to the outside of the release tube 4 now.

As such, by installing the release tube 4 of the ceramic material on the outer circumferential surface of the lance pipe 3, the current attachment can be minimized. However, in operation, a band may be formed on the outside of the release tube 4 in some cases. have. At this time, when the shape of the outer cross section of the release tube (4) is made of a circular shape now the band is formed by a strong mechanical compressive load, which acts as a factor that makes it difficult to remove now.

In order to solve this problem, the cross-sectional shape of the release tube 4 constituting the present invention has a polygonal shape rather than a circular shape. That is, when the cross-sectional outer shape of the release tube 4 is a polygon, the amount of the current attached to each side and the corner portion between the surfaces forming the polygonal shape outside the release tube 4 is reduced, so that the release now Each side of the tube 4 is formed in a separate form. Accordingly, the mechanical compressive load of the band now attached to the outside of the release tube 4 is weakened, so that the now attached to the outside of the release tube 4 can be easily removed.

If the cross-sectional outer shape of the release tube 4 is not a regular polygon, the surface of the release tube 4 that is wider than the release tube 4 may be difficult to remove since the amount of adhesion is increased. Therefore, it is desirable to maximize the band separation effect by forming a cross-sectional outer shape of the release tube 4 in a regular polygonal cross-sectional structure.

A plurality of separate heating plates 7 are fixed to the outside of the release tube 4 at a predetermined interval. The separation heating plate 7 is made of a refractory material, and particularly preferably made of a ceramic material. This is to prevent the now being attached to the separating heating plate (7) like the release tube (4).

By separating the heating plate (7) it is possible to make the now band on the outside of the release tube (4) separated into small parts, thereby dispersing the mechanical compressive load of the band now, so that it can be easily removed now. Will be.

At this time, when the separation heating plate 7 is formed at the corner where each face and the face of the outer side of the release tube 4, the separation heating plate 7 is the same as the band separation form by the polygonal cross-sectional structure of the release tube (4) The release tube 4 serves to separate the bands with the outer edges interposed therebetween.

In addition, when the separation heating plate 7 is formed at the center of each side of the outer side of the release tube 4, the band is now separated between the outer edges of the release tube 4 by a polygonal cross-sectional structure of the release tube 4 as well. Since the separation heating plate 7 forms a separation between the centers of the respective surfaces on the outside of the cross section of the release tube 4, the mechanical compressive load of the band can now be further reduced.

The separating heating plate (7) serves to be removed more easily by heating and cutting a portion of the now band by holding an electric resistance method that is holding the now formed in the circumferential direction on the outer side of the release tube (4) as a mechanical compressive load. Also perform. In other words, by heating the separation heating plate 7 to a high temperature to melt a part of the band now in contact with the separation heating plate 7 to reduce the current mechanical compressive load, it is possible to perform the current removal more easily. . At this time, by contacting the resistance heating element (not shown) heated to a high temperature to the separation heating plate 7 it is possible to heat the separation heating plate 7 by the electric resistance method.

The number of the separation heating plates 7 can be appropriately set according to the number of outer polygon faces of the release tube 4, the working environment, or the amount of adhesion now. When the cross-sectional shape of the release tube 4 is N-shaped, the number of the separation heating plates 7 is preferably set to N.

When the angles between the separation heating plates 7 are not uniform, it is preferable to keep the angle 8 between the separation heating plates constant because the angle between the separation heating plates 7 is not easily removed at this time. At this time, when the cross-sectional shape of the release tube 4 is N-shaped, the angle 8 between the separation heating plate is preferably 360 ° / N.

If you want to remove the now attached to the release tube (4) after the blowing operation, first remove the clamping rod to dismantle the upper fixing tube (6b), and then remove the release tube (4), on the surface of the release tube (4) Remove the now attached and reinstall it in the lancepipe (3).

If the release tube (4) is damaged after being used for a long time over a certain number of operations, it can be replaced with a new one and newly installed. At this time, since the replacement is made by clamping and fixing the upper fixing tube 6b after the release tube 4 is installed, the release tube 4 can be easily replaced, thereby reducing the operating time and reducing the production efficiency. This is improved.

On the other hand, as shown in (b) of Figure 3, the release tube 4 may be to form a polygonal cross-sectional structure by combining the two polygonal structures (4a, 4b). The polygonal structures 4a and 4b are formed in polygons separated in half, and are combined with each other to form a polygon. At this time, the polygonal structure (4a, 4b) in the state arranged to form a polygonal shape on the outer circumferential surface of the lance pipe (3) in the lower end and the upper end of the polygonal structure of the ring-shaped fixing member that is external to the polygonal shape or the release tube (4) By mounting and fixing (not shown), separation can be prevented. As such, by forming the release tube 4 by the polygonal structures 4a and 4b, the release tube 4 may be easily installed and dismantled.

Figure 4 is a vertical cross-sectional view of the polygonal shape converter lance now preventing and removing device according to an embodiment of the present invention. 5 is a horizontal cross-sectional view of the converter lance now preventing and removing the polygonal shape in accordance with an embodiment of the present invention.

As shown in Figures 4 and 5, the release tube (4) constituting the polygonal converter lance preventing attachment and removal of the present invention is a plurality of polygonal tube (4c) of the polygonal cross-sectional structure is in communication It may be made of a connected structure. The polygonal tubes 4c are detachably installed on the outer circumferential surface of the lance pipe 3 for supplying the converter blown oxygen, and are made of a ceramic-based material to prevent the current attachment. Outside of each of the polygonal tubes 4c, a plurality of separate heating plates 7 are fixedly arranged at intervals. As such, when the release tube 4 is formed of the plurality of polygonal tubes 4c, even if partial breakage occurs, only the broken polygonal tube 4c may be replaced.

In the case where a band is attached to the polygonal tube 4c now, the clamping rod is removed, the fixed upper fixing tube 6b is dismantled, the polygonal tube 4c is separated, and then each polygonal tube 4c is attached. A portion of the band is now removed by heating by contacting the resistance heating element 9 with the formed separation heating plates 7. As such, when the release tube 4 is composed of a plurality of polygonal tubes 4c, the mechanical compressive load of the band is now reduced, and thus the removal can be performed very easily.

As shown in (b) of FIG. 5, the polygonal tubes 4c may be two polygonal structures 4d and 4e coupled to each other to form a polygonal cross-sectional structure. The polygonal structures 4d and 4e are formed in polygons separated in half, and are combined with each other to form a polygonal cross-sectional structure. Thus, by forming the polygonal tube (4c) by the polygonal structure (4d, 4e) it is possible to easily perform the replacement of the polygonal tube (4c), thereby reducing the operating time is improved production efficiency.

1 is a cross-sectional view of the converter for blowing steelmaking process.

Figure 2 is a vertical cross-sectional view of the polygonal shape converter lance now preventing and removing device according to an embodiment of the present invention.

Figure 3 is a horizontal cross-sectional view of the converter lance now preventing attachment and removal of the polygonal shape according to an embodiment of the present invention.

Figure 4 is a vertical cross-sectional view of the polygonal shape converter lance now preventing and removing device according to an embodiment of the present invention.

Figure 5 is a horizontal cross-sectional view of the polygonal shape converter lance now preventing and removing device according to an embodiment of the present invention.

♧ description of symbols for the main parts of the drawing

1: converter 2: array boiler cooler 3: lance pipe

4: release tube 4a, 4b, 4d, 4e: polygonal structure 4c: polygonal tube

5: Now 6a: Lower fixing tube 6b: Upper fixing tube

7: Separate heating plate 8: Angle between separation heating plate

Claims (8)

delete A release tube made of a material which is detachably installed on an outer circumferential surface of the lance pipe for supplying oxygen for the converter and prevents current attachment; And a plurality of separation heating plates fixedly spaced apart from the release tube to be separated by heat from a portion of the band now attached to the outside of the release tube. The release tube is a polygonal shape converter lance preventing attachment and removal device, characterized in that the outer shape of the cross-section of the polygonal shape. The method of claim 2, wherein the converter lance now preventing and removing device A resistance heating element electrically connected to the separation heating plate to heat the separation heating plate; The converter lance attachment prevention and removal device of the polygon shape, characterized in that further comprises a. The method according to claim 2 or 3, wherein the release tube is Polygonal converter lance attachment prevention and removal device, characterized in that made of a ceramic-based material. The method according to claim 2 or 3, wherein the release tube is Polygon-shaped converter lance preventing the attachment of the polygon-shaped, characterized in that the structure is installed in a detachable structure on the outer circumferential surface of the lance pipe for supplying the oxygen for the converter is connected in communication with a plurality of polygonal tube made of a material that prevents the current attachment And removal device. The method according to claim 5, wherein the separation heating plate Apparatus for preventing and removing the attachment of the polygon-shaped converter lances, characterized in that fixed to the outer space of each of the polygonal tube. The method according to claim 2 or 3, wherein the release tube is A device for preventing and removing a polygonal shape converter lance attachment, characterized in that two polygonal structures consisting of polygons separated in half are combined to form a polygonal shape. The method according to claim 2 or 3, The converter lance attachment prevention and removal device further comprises a lower fixing tube that is fixed to the lower end side of the lance pipe, and an upper fixing tube fixed to the upper end side of the lance pipe, The release tube is installed between the lower fixing tube and the upper fixing tube is fixed to the upper and lower by the lower fixing tube and the upper fixing tube polygonal converter lance attachment prevention and removal device.

Images