WO2022211287A1

WO2022211287A1 - Lance head

Info

Publication number: WO2022211287A1
Application number: PCT/KR2022/002849
Authority: WO
Inventors: 이해양
Original assignee: 주식회사 서울엔지니어링
Priority date: 2021-03-27
Filing date: 2022-02-28
Publication date: 2022-10-06
Also published as: KR102581167B1; KR20220134673A; KR20230129958A; KR102581162B1

Abstract

The present invention relates to a lance head provided at the front end of a lance nozzle through which oxygen is introduced into a steel converter and, more specifically, to a lance head configured such that cooling water flows dynamically inside the lance head, thereby maximizing the effect of cooling by the cooling water. A lance head according to an embodiment of the present invention comprises: an upper base (20) to which oxygen is supplied; an intermediate base (30) provided below the upper base (20) so as to form an inflow space (31) into which cooling water is introduced; a lower base (40) provided below the intermediate base (30) so as to form a flow-through space (42) in which cooling water introduced into the inflow space (31) flows therethrough; and an oxygen discharge tube (50) extending through the upper base (20), the intermediate base (30), and the lower base (40) so as to discharge oxygen supplied to the upper base (20) through the lower portion of the lower base (40). The intermediate base (30) has a center hole (32) formed at the center portion thereof so as to connect the inflow space (31) and the flow-through space (42), and a guide portion (33) for guiding cooling water introduced into the inflow space (31) to the center hole (32). One side (35) and the other side (36) of an end portion (34) of the guide portion (33) may be inclined such that a vortex occurs when cooling water introduced into the inflow space (31) flows towards the center hole (32) along the guide portion (33).

Description

lance head

The present invention relates to a lance head provided at the tip of a lance nozzle for blowing oxygen into a converter, and more particularly, to a lance capable of maximizing the cooling effect of the coolant by dynamically flowing coolant in the lance head It's about the head.

In general, a steel converter is provided with a lance nozzle that blows oxygen to remove impurities (C, Mn, P, etc.) in the molten iron. After the lance nozzle is positioned above the converter, oxygen When blown, impurities (C, Mn, P) in the molten iron can be removed by oxidation with the blown oxygen.

The lance nozzle is configured to circulate coolant for cooling the lance head since the lance head is operated for a predetermined time or longer in a state in which the lance head is disposed at a distance close to the hot molten iron.

As a prior art for the lance head, registered patent No. 10-1117262 (title of the invention: a lance head with excellent thermal conductivity and abrasion resistance and a manufacturing method thereof, publication date: 2012. 3. 16) filed by the present applicant and registered has been disclosed.

1 is a cross-sectional view showing a lance nozzle equipped with a lance head according to the prior art.

Referring to FIG. 1 , the lance nozzle 1 is an inner pipe 5 to which oxygen is supplied, and an intermediate pipe 7 provided outside the inner pipe 5 to supply cooling water between the inner pipe 5 and the inner pipe 5 . ), may include an outer pipe (9) provided outside the intermediate pipe (7) through which the cooling water is discharged with the intermediate pipe (7).

In addition, the lance nozzle 1 is connected to the inner pipe 5, the intermediate pipe 7, and the outer pipe 9 by welding or the like, and a plurality of outlet holes 2 are formed at the tip end. It may include a lance head (3).

The lance head 3 is configured so that oxygen supplied to the inner pipe 5 is injected through the plurality of outlet holes 2 , and cooling water is supplied between the inner pipe 5 and the intermediate pipe 7 . may be configured to be discharged through between the intermediate pipe 7 and the outer pipe 9 again after being perfused to the front end of the lance head 3 .

Then, the lance head 3 may be cooled by the coolant discharged after flowing through the front end of the lance head 3 .

However, since the lance head 3 is operated for more than a certain time while being disposed at a distance close to the high-temperature molten iron, there is a problem in that it has to be replaced frequently due to damage caused by the high-temperature molten iron. In order to improve the durability of 3), it is necessary to make cooling by cooling water effective.

An object of the present invention is to solve the above problems, and an object of the present invention is to provide a lance head capable of maximizing the cooling effect of the coolant by dynamically flowing the coolant in the lance head.

In an embodiment of the present invention, the lance head includes an upper base 20 to which oxygen is supplied; an intermediate base 30 provided under the upper base 20 to form an inlet space 31 through which cooling water is introduced; a lower base 40 provided under the intermediate base 30 to form a flow-through space 42 through which the coolant introduced into the inflow space 31 flows; and an oxygen discharge pipe 50 for discharging oxygen supplied to the upper base 20 to the lower portion of the lower base 40 through the upper base 20, the intermediate base 30, and the lower base 40 ; and, the intermediate base 30 is formed in the center to receive a central hole 32 connecting the inflow space 31 and the flow-through space 42, and cooling water flowing into the inflow space 31. A guide part 33 for guiding to the central hole 32 is provided, and the guide part 33 includes the cooling water introduced into the inflow space 31 along the guide part 33 . One side 35 and the other side 36 of the end portion 34 may be inclined so that a tornado occurs when flowing toward the .

In addition, the lance head in an embodiment of the present invention, the one side 35 and the other side 36 may be inclined in the circumferential direction of the center hole (32).

In addition, in an embodiment of the present invention, the lance head may be formed such that one side 35 of the end portion 34 is high, and the other side 36 is low.

In addition, in an embodiment of the present invention, in the lance head, the guide part 33 is inclined downward in the radial direction of the central hole 32 , and the one side 35 and the other side 36 are the central hole 32 . ) can be inclined in the circumferential direction.

In addition, in an embodiment of the present invention, in the lance head, the oxygen discharge pipe 50 is arranged in a plurality in the circumferential direction of the upper base 20 , and the guide part 33 is between the plurality of oxygen discharge pipes 50 . A plurality of guide portions are provided between each of the guide portions 33, and one side 35 of the end portion 34 is high and the other side 36 is formed low, so that a step 37 may occur between the adjacent guide portions 33. have.

In addition, in the lance head in one embodiment of the present invention, each guide part 33 is inclined in the radial direction of the central hole 32 , and the end part 34 is the circumference of the central hole 32 . The inclination direction in the circumferential direction of the plurality of guide parts 33 may be formed in the same direction.

In addition, in an embodiment of the present invention, in the lance head, the planar shape of the center hole 31 formed by the plurality of guide portions 33 end portions 34 may be formed in a pinwheel shape.

In addition, the lance head in one embodiment of the present invention, the upper base 20 connected to the inner pipe 5 to which oxygen is supplied; It is connected to the intermediate pipe 7 provided on the outside of the inner pipe 5, and is provided under the upper base 20 and the coolant supplied between the inner pipe 5 and the intermediate pipe 7 is introduced. an intermediate base 30 forming a space 31; It is provided under the intermediate base 30 to form a flow-through space 42 through which the coolant introduced into the inflow space 31 flows, and the coolant flowed into the flow-through space 42 is provided with the intermediate pipe 7 and a lower base 40 connected to the outer pipe 9 so as to be discharged between the outer pipes 9 provided outside the intermediate pipe 7; and an oxygen discharge pipe (50) for discharging oxygen supplied to the upper base (20) to the lower portion of the lower base (40) through the upper base (20), the intermediate base (30) and the lower base (40) ; and, the intermediate base 30 is formed in the center and provides a central hole 32 connecting the inflow space 31 and the flow-through space 42, and cooling water flowing into the inflow space 31. a guide part 33 for guiding to the central hole 32 is provided, and the guide part 33 includes the cooling water introduced into the inflow space 31 along the guide part 33 . One side 35 and the other side 36 of the end portion 34 may be inclined so that a tornado occurs when flowing toward the .

According to the lance head according to an embodiment of the present invention having the above configuration, the cooling water flow in the lance head is made dynamically, so that the cooling effect by the cooling water can be maximized, and accordingly, the Durability can be improved.

The effects according to the present invention are not limited to the effects mentioned above, and other effects not mentioned will be clearly understood by those of ordinary skill in the art to which the present invention belongs from the description of the claims and detailed description. will be able

1 is a cross-sectional view showing a lance nozzle equipped with a lance head according to the prior art;

2 is a front view of a lance head according to an embodiment of the present invention;

Figure 3 is a plan view of the lance head according to Figure 2,

Figure 4 is a bottom view of the lance head according to Figure 2,

5 is a front view of a cross-section taken along line 'A-A' of FIG. 2,

6 is a perspective view of a cross-section taken along line 'A-A' of FIG. 2;

7 is a plan view of a cross-section taken along line 'B-B' of FIG. 2 .

Hereinafter, an embodiment will be described in detail with reference to the accompanying drawings. In the description with reference to the accompanying drawings, the same components are given the same reference numerals, and redundant description thereof will be omitted.

When a part "includes" a certain component, it means that other components may be further included without excluding other components unless otherwise stated.

In this specification, relative terms such as 'upper', 'lower', 'top', 'bottom', 'up', 'down', etc. may be used to describe the relationship between components based on the direction shown in the drawings. , the present invention is not limited by such terms.

Each embodiment may be implemented independently or together, and some components may be excluded in accordance with the purpose of the invention.

While the present invention is susceptible to various modifications and variations, specific embodiments thereof are illustrated and illustrated in the drawings and will be described in detail hereinafter. However, it is not intended to limit the invention to the particular form disclosed, but rather the invention includes all modifications, equivalents and substitutions consistent with the spirit of the invention as defined by the claims.

In addition, in the accompanying drawings, the thickness and size are exaggerated for clarity of the specification, and thus the present invention is not limited by the relative size or thickness shown in the accompanying drawings.

Figure 2 is a front view of the lance head according to an embodiment of the present invention, Figure 3 is a plan view of the lance head according to Figure 2, Figure 4 is a bottom view of the lance head according to Figure 2, Figure 5 is Figure 2 It is a front view of a cross-section cut along the 'A-A' line.

2 to 5 , the lance head 10 according to an embodiment of the present invention forms an upper end of the lance head 10 and includes an upper base 20 to which oxygen is supplied, and a lower portion of the upper base 20 The intermediate base 30, which is provided in the inlet to form the inlet space 31 through which the coolant is introduced, forms the lower end of the lance head 10, and is provided under the intermediate base 30 and introduced into the inlet space 31. It may include a lower base 40 forming a flow-through space 42 through which the coolant flows.

In addition, the lance head 10 penetrates the upper base 20 , the intermediate base 30 and the lower base 40 to supply oxygen supplied to the upper base 20 to the lower base 40 , the lower part of the lance head 10 . It may include an oxygen discharge pipe 50 for discharging to.

A plurality of oxygen discharge pipes 50 may be arranged in the circumferential direction of the upper base 20 , and as shown in FIG. 3 , the upper base 20 has a through hole connected to the plurality of oxygen discharge pipes 50 . A plurality of 23 may be formed in the circumferential direction, and as shown in FIG. 4 , a plurality of through holes 43 connected to the plurality of oxygen discharge pipes 50 are provided in the lower portion of the lower base 40 in the circumferential direction. can be formed.

In addition, the oxygen discharge pipe 50 may be provided inclined to the outside of the lance head (10). The intermediate base 30 may have a size large enough to accommodate the upper base 20 , and the lower base 40 may be large enough to accommodate the intermediate base 30 . can have

The intermediate base 30 is formed in the center and provides a central hole 32 connecting the inflow space 31 and the flow-through space 42 , and cooling water flowing into the inflow space 31 through the central hole 32 . ) may be provided with a guide portion 33 for guiding.

On the other hand, referring to Figure 1, the lance nozzle (1) according to an embodiment of the present invention is provided outside the inner pipe (5) to which oxygen is supplied, the inner pipe (5), and between the inner pipe (5) and the It may include an intermediate pipe 7 through which cooling water is supplied, and an outer pipe 9 provided outside the intermediate pipe 7 and through which the cooling water is discharged between the intermediate pipe 7 and the intermediate pipe 7 .

The lance head 10 according to an embodiment of the present invention may be provided at the front end of the lance nozzle 1 having the above configuration.

For example, the upper base 20 is welded to the inner pipe 5, the intermediate base 30 is welded to the intermediate pipe 7, and the lower base 40 is welded to the outer pipe 9, etc. can be connected by the method of

Then, the oxygen supplied through the inner pipe 5 may be introduced into the upper base 20 and discharged to the lower part of the lower base 40 through the oxygen discharge pipe 50, and the inner pipe 5 and the cooling water supplied between the intermediate pipe 7 and the intermediate pipe 7 are introduced into the inflow space 31 of the intermediate base 30 and flow through the flow-through space 42 of the lower base 40 and It may be discharged between the outer pipe (9).

Therefore, the lance head 10 according to an embodiment of the present invention blows oxygen through the upper base 20 and the oxygen discharge pipe 50 to remove impurities (C, Mn, P, etc.) in the molten iron. can do it

In addition, the lance head 10 according to an embodiment of the present invention flows into the inflow space 31 of the intermediate base 30 and flows through the flow-through space 42 of the lower base 40, and then the cooling water discharged can be cooled by

On the other hand, in the lance head 10 according to an embodiment of the present invention, the coolant flow in the flow-through space 42 is dynamic in order to maximize the cooling effect of the coolant to improve the durability of the lance head 10 . It can be configured to be made of.

Hereinafter, the configuration will be described in detail.

6 is a perspective view of a cross-section taken along line 'A-A' of FIG. 2 , and FIG. 7 is a plan view of a cross-section cut along line 'B-B' of FIG. 2 .

6 and 7 , the guide part 33 according to an embodiment of the present invention may be formed so that one side 35 and the other side 36 of the end part 34 are inclined.

For example, one side 35 of the end portion 34 of the guide part 33 may be high and the other side 36 may be formed low.

At this time, the inclination may be made in the circumferential direction of the center hole 31 . That is, the one side 35 and the other side 36 may be inclined in the circumferential direction of the center hole 31 .

In addition, the guide part 33 may be inclined downward in a radial direction of the central hole 32 , and an end portion 34 of the guide part 33 may be inclined in a circumferential direction of the central hole 32 . .

Then, when the coolant introduced into the inlet space 31 flows along the guide part 33 toward the central hole 32, it flows in the circumferential direction of the central hole 32 (in the direction of the arrow in FIG. 7 ). As a result, a tornado is generated, which enables the flow of cooling water in the flow-through space 42 to be more dynamically generated, and the cooling effect of the cooling water can be maximized.

In fact, according to the inventor's experiments, it was confirmed that, when having the above configuration, the durability of the lance head 10 can be improved significantly compared to the case where it is not.

In addition, a plurality of guide portions 33 may be provided between the plurality of oxygen discharge tubes 50 .

At this time, one side 35 of the end portion 34 of each of the guide portions 33 is high and the other side 36 is formed low, so that a step 37 may occur between the adjacent guide portions 33 .

In addition, each of the guide portions 33 is inclined in the radial direction of the center hole 32 , and the end portion 34 is inclined in the circumferential direction of the center hole 32 , and the plurality of end portions 34 are inclined in the circumferential direction of the center hole 32 . ) in the circumferential direction may be formed in the same direction.

For example, as shown in FIG. 7 , all inclination directions of the plurality of end portions 34 may be made in the same clockwise or counterclockwise direction of the central hole 32 .

Then, the tornado generated when the coolant introduced into the inflow space 31 flows along the guide part 33 toward the center hole 32 may be clockwise or counterclockwise.

Accordingly, as shown in FIG. 7 , the planar shape of the center hole 31 formed by the end portions 34 of the plurality of guide portions 33 may have a substantially pinwheel shape.

As described above, the present invention relates to a lance head capable of maximizing a cooling effect by dynamically flowing coolant within the lance head, and its embodiment may be changed into various forms. Therefore, the present invention is not limited by the embodiments disclosed herein, and all forms that can be changed by a person of ordinary skill in the art to which the present invention pertains will fall within the scope of the present invention.

Claims

an upper base 20 to which oxygen is supplied;

an intermediate base 30 provided under the upper base 20 to form an inlet space 31 through which cooling water is introduced;

a lower base 40 provided under the intermediate base 30 to form a flow-through space 42 through which the coolant introduced into the inflow space 31 flows; and

an oxygen discharge pipe 50 passing through the upper base 20, the intermediate base 30 and the lower base 40 and discharging oxygen supplied to the upper base 20 to the lower part of the lower base 40; including,

The intermediate base 30 is formed in the center and provides a central hole 32 connecting the inflow space 31 and the flow-through space 42 , and cooling water flowing into the inflow space 31 through the central hole 32 . ) is provided with a guide portion 33 to guide,

The guide part 33 has one side 35 of the end part 34 so that a tornado occurs when the coolant introduced into the inflow space 31 flows along the guide part 33 toward the center hole 32 . ) and the other side (36) is a lance head, characterized in that inclined.
The method of claim 1,

The one side (35) and the other side (36) are lance head, characterized in that inclined in the circumferential direction of the center hole (32).
The method of claim 1,

Lance head, characterized in that one side (35) of the distal end (34) is high and the other side (36) is formed low.
The method of claim 1,

The guide part 33 is inclined downward in the radial direction of the central hole 32 , and the one side 35 and the other side 36 are inclined in the circumferential direction of the central hole 32 . .
The method of claim 1,

A plurality of the oxygen discharge pipes 50 are arranged in a circumferential direction of the upper base 20 , and a plurality of guide parts 33 are provided between the plurality of oxygen discharge pipes 50 , and each of the guide parts 33 ) Lance head, characterized in that one side (35) of the end portion (34) is high and the other side (36) is formed low, so that a step (37) occurs between the adjacent guide parts (33).
6. The method of claim 5,

Each of the guide portions 33 is inclined in the radial direction of the center hole 32 , and the end portion 34 is inclined in the circumferential direction of the center hole 32 , The lance head, characterized in that the inclination direction in the circumferential direction is formed in the same direction.
7. The method of claim 6,

The planar shape of the center hole (31) formed by the plurality of guide parts (33) end portions (34) is a lance head, characterized in that it has a pinwheel shape.
an upper base 20 connected to the inner pipe 5 to which oxygen is supplied;

It is connected to the intermediate pipe 7 provided on the outside of the inner pipe 5, and is provided under the upper base 20 and the coolant supplied between the inner pipe 5 and the intermediate pipe 7 is introduced. an intermediate base 30 forming a space 31;

It is provided under the intermediate base 30 to form a flow-through space 42 through which the coolant introduced into the inflow space 31 flows, and the coolant flowed into the flow-through space 42 is provided with the intermediate pipe 7 and a lower base 40 connected to the outer pipe 9 so as to be discharged between the outer pipes 9 provided outside the intermediate pipe 7; and

an oxygen discharge pipe 50 passing through the upper base 20, the intermediate base 30 and the lower base 40 and discharging oxygen supplied to the upper base 20 to the lower part of the lower base 40; including,

The intermediate base 30 is formed in the center and provides a central hole 32 connecting the inflow space 31 and the flow-through space 42 , and cooling water flowing into the inflow space 31 through the central hole 32 . ) is provided with a guide portion 33 to guide,

The guide part 33 has one side 35 of the end part 34 so that a tornado occurs when the coolant introduced into the inflow space 31 flows along the guide part 33 toward the center hole 32 . ) and the other side 36 is a lance head, characterized in that it is inclined