CN217479490U

CN217479490U - Long-life composite air supply brick

Info

Publication number: CN217479490U
Application number: CN202220934871.0U
Authority: CN
Inventors: 谭喜阳; 蔡长秀; 张勇; 郑吉红; 王志强; 雷中兴
Original assignee: Wuhan Iron And Steel Group Refractory Materials Co ltd
Current assignee: Wuhan Iron And Steel Group Refractory Materials Co ltd
Priority date: 2022-04-21
Filing date: 2022-04-21
Publication date: 2022-09-23
Anticipated expiration: 2032-04-21

Abstract

The utility model discloses a compound air feed brick of long-life, its bottom of laying in steelmaking converter or electric stove as the partly of bottom brick, it includes the brick body by magnesium carbon refractory material press forming, the inside top-down of the brick body runs through to distribute has many capillaries, the bottom of the brick body is provided with the air chamber box that is linked together with many capillaries, the inside geometric center of the brick body still top-down inlays and has set a central single tube, the blind end of central single tube's top for burying underground at the internal portion of brick, the open end that central single tube's bottom is linked together with the air chamber box, central single tube's design length is within the required minimum thickness scope of bottom brick normal work. It can avoid traditional capillary formula air feed brick to be easily by stifled and influence the converting effect, can not effectively participate in the defect of end-blown stirring, still can play the safety warning effect through the obvious difference in the vision, improves the security of later stage air feed brick operation, can increase of service life simultaneously by a wide margin.

Description

Long-life composite air supply brick

Technical Field

The utility model belongs to the refractory material field for the steelmaking especially relates to a compound air feed brick of long-life.

Background

Converters or electric furnaces are important equipments in steel works, which are mainly used to convert molten iron into molten steel while removing a large amount of impurities from the steel, and also to reduce the carbon content of the molten steel and to adjust the temperature of the molten steel. The air supply brick is an important composition structure of a furnace bottom brick in a converter or an electric furnace, and can accelerate the carbon-oxygen reaction in molten steel and the floating of impurities in the molten steel.

The existing air supply brick generally adopts three structural forms of a capillary type, an annular seam type and a single-tube type. Wherein the capillary type gas supply brick is generally used by steel mills due to good stirring effect; and the circular seam type air supply brick and the single-tube type air supply brick have poor stirring effect due to concentrated air supply, and the service life of the air supply brick is influenced due to fast erosion of the air supply brick in the operation process.

Fig. 1-2 show the structure schematic diagram of current capillary air feed brick, and it includes the brick body 4 by magnesium carbon refractory material press forming, and the inside of brick body 4 runs through to distribute has many capillaries 2, and capillary 2 is along the inside of the brick body to disperse and arranges, and the bottom of the brick body is provided with the air chamber box 1 that is linked together with many capillaries 2. The capillary air supply brick is easily covered by slag in the later use process, and is easily blocked, so that the bottom blowing effect is influenced.

Disclosure of Invention

The utility model aims at providing a compound air feed brick of long-life to solve current capillary air feed brick and be stopped up easily and influence the problem of converting the effect at the operation later stage, be favorable to improving the life of air feed brick moreover.

In order to achieve the above object, the utility model discloses a compound air feed brick of long-life lays in the bottom of steelmaking converter or electric stove as the partly of bottom of a furnace brick, and it includes the brick body by magnesia carbon refractory material press forming, the inside top-down of the brick body runs through to distribute has many capillaries, the bottom of the brick body is provided with the air chamber box that is linked together with many capillaries, and its special character lies in: a central single tube is further embedded in the geometric center of the interior of the brick body from top to bottom, the top end of the central single tube is a closed end embedded in the interior of the brick body, the bottom end of the central single tube is an open end communicated with the gas chamber box, and the designed length of the central single tube is within the minimum thickness range required by the normal work of the furnace bottom brick.

As a preferred scheme, the design length of the central single tube is 300-500 mm.

Further, the design length of the central single tube is 400 mm.

As a preferred scheme, the inner diameter of the central single tube is 3-7 mm, the inner diameter of the capillary tube is 1-2 mm, and the multiple capillary tubes are distributed in a balanced mode by taking the central single tube as a symmetrical point.

Further, the number of the arranged capillary tubes is 24-32.

Furthermore, the arrangement space between the central single tube and the nearest capillary tube and between every two adjacent capillary tubes is 10-15 mm.

As a preferred scheme, the center single tube is a stainless steel tube, the top end of the center single tube is of a spot welding closed structure, and the bottom end of the center single tube is connected with the top surface of the air chamber box in a welding mode. And the spot welding connection is adopted, so that molten steel can wash off the closed end when the bottom of the converter is corroded and falls to the closed position of the top end of the central single tube in the later operation period of the converter.

Compared with the prior art, the utility model discloses can gain following beneficial effect:

1. through the combination of a plurality of capillaries and a central single tube, a large amount of bubbles are produced through the capillaries in the early stage, molten steel inclusions are removed by utilizing the floating of the large amount of bubbles, and the gas supply brick is consumed in the later stage until the central single tube is opened for ventilation, so that the defects that the blowing effect is influenced and the bottom blowing stirring cannot be effectively participated in due to the fact that the traditional capillary gas supply brick is easily blocked are overcome;

2. when the thickness loss of the bottom brick of the converter reaches the upper end of the central single pipe, the obvious difference of the capillary gas supply and the central single pipe gas supply in vision can play a role in safety warning, and the safety of the later-stage gas supply brick operation can be improved;

3. the utility model discloses simple structure, the converting effect is showing, compares with traditional air feed brick, and its life can improve about 1500 heats.

Drawings

FIG. 1 is a schematic axial sectional view of a conventional gas supply brick;

FIG. 2 is a schematic cross-sectional view taken along line A-A in FIG. 1;

FIG. 3 is a schematic view of the axial section structure of the long-life composite gas supply brick of the present invention;

FIG. 4 is a schematic cross-sectional view taken along line B-B in FIG. 3;

FIG. 5 is an enlarged schematic view of the structure of FIG. 4;

the parts in the drawings are numbered as follows: a gas cell box 1; a capillary tube 2; a central single tube 3; and a brick body 4.

Detailed Description

The present invention is described in further detail below with reference to the following figures and specific examples, which should not be construed as limiting the invention.

The structure and the deficiency of the prior art air supply brick shown in fig. 1-2 are already described in the background section, and are not described herein again.

Fig. 3 to 5 show a long-life composite gas supply brick described in this embodiment, which is laid at the bottom of a steel converter or an electric furnace as a part of a hearth brick, and includes a brick body 4 formed by pressing a magnesia carbon refractory material, an air chamber box 1 is disposed at the lower part of the brick body 4, a central single tube 3 is disposed at the geometric center of the brick body 4, and 28 capillaries 2 are uniformly disposed around the central single tube 3. Wherein the brick body 4 is formed by adopting a magnesia carbon brick filling machine or isostatic pressing.

In this embodiment, as shown in fig. 3, the bottom end of the central single tube 3 and the bottom ends of all the capillaries 2 are both communicated with the gas chamber box 1, the top end of the central single tube 3 is a closed end embedded in the brick body 4, and the top end of the capillary 2 penetrates through the brick body 4. In the early stage, a large amount of bubbles are produced by the capillary 2, and molten steel inclusions are removed by floating up the large amount of bubbles. The utility model discloses a special character lies in having adopted central single tube 3's structural style, has avoided traditional capillary air feed brick to be blocked up and influence the converting in the later stage, can not effectively participate in the defect of bottom blowing stirring, still can make the life of air feed brick improve about 1500 heats.

In the present embodiment, as shown in fig. 4 to 5, the inner diameter of the central single tube 3 is 5mm, the inner diameter of the capillary tube 2 is 2mm, and the wall thickness of both tubes is 1 mm. The arrangement pitches d between the central single tube 3 and its nearest capillary 2 and between each adjacent capillary 2 are the same and 15 mm. The above data can be selected according to the needs of the actual production process.

In this embodiment, as shown in FIG. 3, the length D of the brick body 4 ₁ Is 900mm, the length D of the central single tube 3 ₂ Is 400 mm. In actual production, the length D of the central monotube 3 ₂ The use effect is better at 300-500 mm, and the requirement of 300mm of safety limit thickness of the air supply brick can be met.

In this embodiment, the top end of the central single tube 3 is closed by spot welding, and the bottom end is fixed to the end face of the gas chamber box 1 by welding. At the later stage of operation of the converter or the electric furnace, when the bottom of the converter is corroded and falls to the closed position of the top end of the central single tube 3, the closed end is washed away by molten steel. The central single tube 3 is automatically opened to ventilate under the influence of air pressure, and after the central single tube 3 is ventilated, the capillary tube 2 is automatically closed due to the pressure difference of about 2-9 times between the capillary tube 2 and the central single tube 3 and the molten steel pressure and the slag coverage in the later period. At the moment, the air supply flow is gathered to the central single tube 3, so that the surface of the capillary tube 2 can be prevented from being blocked by slag.

In the embodiment, when the central single tube 3 is opened for ventilation, the fact that 400mm remains in the brick body 4 is meant, the difference between the air supply of the capillary tube 2 and the air supply of the central single tube 3 is obvious in vision, the vision difference is mainly shown in the early stage of the air supply of the capillary tube 2, square black spots of about 100 x 140mm are formed on the air supply brick through visual observation, and in the later stage, due to the fact that the capillary tube 2 is closed, only the central single tube 3 supplies air, circular black spots of about 50mm are formed, obvious warning is given, and the safety of the operation of the later stage air supply brick is improved.

In the embodiment, the introduced gas is inert gas, different from oxygen in the prior art, a large amount of bubbles are produced through the capillary tube 2 in the early stage, molten steel inclusions are removed by utilizing the floating of the large amount of bubbles, and because the inert gas does not participate in the reaction, the solubility of molten steel is low, the inclusion of the molten steel cannot be increased by introducing the inert gas, and the effect is better.

The above description is only for the preferred embodiment of the present invention, and should not be taken as limiting the invention, and any modifications, equivalent replacements, improvements and the like made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. The utility model provides a compound air feed brick of long-life, lays in the bottom of steelmaking converter or electric stove as the partly of bottom of a furnace brick, and it includes the brick body (4) by magnesia carbon refractory material press forming, the inside top-down of the brick body (4) runs through to distribute has many capillaries (2), the bottom of the brick body (4) is provided with air chamber box (1) that are linked together with many capillaries (2), its characterized in that: a central single tube (3) is further embedded in the geometric center of the interior of the brick body (4) from top to bottom, the top end of the central single tube (3) is a closed end embedded in the interior of the brick body (4), the bottom end of the central single tube (3) is an open end communicated with the air chamber box (1), and the designed length of the central single tube (3) is within the minimum thickness range required by the normal work of the furnace bottom brick.

2. The long life composite gas supply brick of claim 1, characterized in that: the design length of the central single tube (3) is 300-500 mm.

3. The long life composite gas supply brick of claim 2, characterized in that: the design length of the central single tube (3) is 400 mm.

4. The long-life composite gas supply brick according to claim 1, 2 or 3, wherein: the inner diameter of the central single tube (3) is 3-7 mm, the inner diameter of the capillary tube (2) is 1-2 mm, and the capillary tubes (2) are distributed in a balanced mode by taking the central single tube (3) as a symmetrical point.

5. The long life composite gas supply brick of claim 4, characterized in that: the number of the capillaries (2) is 24-32.

6. The long life composite gas supply brick of claim 5, wherein: the arrangement distance between the central single tube (3) and the nearest capillary tube (2) and between the adjacent capillary tubes (2) is 10-15 mm.

7. The long-life composite gas supply brick according to claim 1, 2 or 3, wherein: the central single tube (3) is a stainless steel tube, the top end of the central single tube is of a spot welding closed structure, and the bottom end of the central single tube is connected with the top surface of the air chamber box (1) in a welding mode.