CN211947109U

CN211947109U - Converter bottom structure

Info

Publication number: CN211947109U
Application number: CN202020500060.0U
Authority: CN
Inventors: 张国东; 董诗朋; 庞洪亮; 邢伟; 李永一; 冯晓明; 王志利; 田龙; 柴嘉悦
Original assignee: Chengde Jianlong Special Steel Co Ltd
Current assignee: Chengde Jianlong Special Steel Co Ltd
Priority date: 2020-04-08
Filing date: 2020-04-08
Publication date: 2020-11-17
Anticipated expiration: 2030-04-08

Abstract

The utility model belongs to the technical field of the converter steelmaking, a converter bottom structure is disclosed, it protects the brick including setting up the bottom brick on the furnace body bottom surface and the end blowing of pressing from both sides in locating the bottom brick, the end is blown and is protected the brick and including protecting brick main part and giving vent to anger head, protect and offer the centre bore that link up from the bottom to the top in the brick main part, the centre bore is used for installing the air feed component, the head of giving vent to anger sets up in the top of protecting the brick main part, the ventilative chamber has been seted up to the inside of the head of giving vent to anger, ventilative chamber intercommunication is in the centre bore, the head of giving vent to anger is hemispherical structure, the interval is provided with a plurality of bleeder vents on the head of giving vent to anger. The utility model provides a converter bottom construction can reduce the impact effect of gas and molten steel to refractory material around the air feed component, prolongs the life of air feed component.

Description

Converter bottom structure

Technical Field

The utility model belongs to the technical field of the converter steelmaking, especially, relate to a converter bottom structure.

Background

In metallurgical vessels such as converters, electric furnaces and ladles in steel making, various gases (nitrogen, argon, air, etc.) are blown into molten iron or molten steel from any part such as the bottom, side and top by gas supply elements according to process requirements. In a metallurgical vessel facility, after various gases are blown by a gas supply means, molten iron and molten steel are stirred by kinetic energy of blown bubbles and floating of high-temperature expansion, thereby promoting metallurgical reaction between the molten iron, molten steel and slag.

At present, converter bottom blowing is a mature steelmaking process, the furnace life is continuously increased since a slag splashing furnace protection technology is adopted, but the negative effects are also obvious: 1. gas enters the molten pool through the gas supply element in the form of bubbles, and the gas has an impact effect on refractory materials around the gas supply element at the moment when the bubbles are separated from the end part of the gas supply element; 2. when the bubbles are separated from the end part of the gas supply element, the molten steel is caused to flow, and the refractory materials around the gas supply element are washed; 3. due to the co-scouring of the gas and the molten steel, pits are formed on the refractory materials around the gas supply element, and the deeper the pits are, the worse the convection heat transfer is, and the more the melting loss of the refractory materials is. Due to the combined action of the above phenomena, the gas supply element is easily damaged, thereby reducing the service life of the gas supply element.

Therefore, a converter bottom structure is needed to solve the above technical problems.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a converter bottom structure can reduce the impact effect of gas and molten steel to refractory material around the air feed component, prolongs the life of air feed component.

To achieve the purpose, the utility model adopts the following technical proposal:

the utility model provides a converter bottom construction, includes that the bottom brick that sets up on the furnace body bottom surface with press from both sides and locate bottom among the bottom brick blows and protect the brick, bottom blows and protects the brick and include:

the protective brick main body is provided with a through center hole from the bottom end to the top end, and the center hole is used for mounting an air supply element;

the air outlet head is arranged at the top end of the brick protecting main body, an air permeable chamber is arranged inside the air outlet head and communicated with the central hole, the air outlet head is arranged at the opening position at the top end of the central hole for covering, a plurality of air holes are formed in the air outlet head at intervals, the air permeable chamber blows air into the furnace body through the air holes, and the sum of the flow areas of the air holes is larger than the flow area of the outlet of the air supply element.

Preferably, the air permeable chamber is a hemispherical cavity, and the air permeable holes penetrate through the air outlet head along the radial direction of the air outlet head.

Preferably, the diameter of the hemispherical cavity is larger than that of the central hole.

Preferably, the inner wall of the air hole is covered with a temperature-resistant layer.

Preferably, the diameter of the air hole is gradually increased from one end communicated with the air permeable chamber to the other end.

Preferably, the cross section of the brick protecting main body is trapezoidal.

Preferably, the furnace bottom bricks comprise a plurality of first circles of bricks, the first circles of bricks are arranged around the bottom blowing protection bricks, and the height of the bottom blowing protection bricks is 25-70 mm higher than that of the first circles of bricks.

Preferably, the furnace bottom brick further comprises a plurality of second rings of bricks, the second rings of bricks are arranged on one side of the first ring of bricks, which deviates from the bottom blowing protection bricks, and the first rings of bricks are 25mm-70mm higher than the second rings of bricks.

Preferably, the bottom bricks further comprise a plurality of basic bottom bricks, the second ring bricks, the first ring bricks and the bottom blowing protection bricks cover the bottom surface of the furnace body, and the second ring bricks are 25mm-70mm higher than the basic bottom bricks.

Preferably, a shim layer is laid between the furnace bottom brick and the bottom surface of the furnace body.

The utility model has the advantages that:

the utility model provides a converter bottom construction, protect centre bore in the brick main part and be used for installing the air feed component, the air feed component blows in gas in the ventilative room, gas blows into in the furnace body through a plurality of bleeder vents, because the flow area sum of a plurality of bleeder vents is greater than the flow area of air feed component's export, a plurality of bleeder vents can disperse and reduce gaseous impact force, alleviate the erosion to refractory material, and because the gas outlet head is hemispherical structure, the gas of blowing at the bottom during smelting production is delivered through the gas outlet head and is realized dispersion and breathe freely, the appearance time of protecting brick pit melting loss at the bottom of having delayed widely, thereby the life of extension air feed component. The utility model provides a converter bottom construction can reduce the impact effect of gas and molten steel to refractory material around the air feed component, prolongs the life of air feed component.

Drawings

FIG. 1 is a cross-sectional view of a rotary kiln bottom structure provided in an embodiment of the present invention;

FIG. 2 is a cross-sectional view of a bottom-blowing protective brick provided by an embodiment of the present invention;

FIG. 3 is a bottom view of a bottom-blowing protective brick provided by an embodiment of the present invention;

FIG. 4 is a top view of a rotary kiln bottom structure provided in accordance with an embodiment of the present invention;

fig. 5 is an enlarged view at a in fig. 4.

In the figure:

1. a furnace body; 2. a hearth brick; 3. bottom-blown protective bricks;

11. mounting holes; 21. a first ring of bricks; 22. a second ring of bricks; 23. a foundation bottom brick; 31. protecting the brick main body; 32. an air outlet head;

311. a central bore; 321. a gas permeable chamber; 322. and (4) air holes.

Detailed Description

Reference will now be made in detail to the embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar parts throughout, or parts having the same or similar functions. The embodiments described below with reference to the drawings are exemplary and intended to be used for explaining the present invention, and should not be construed as limiting the present invention.

In the description of the present invention, unless otherwise expressly specified or limited, the terms "connected," "connected," and "mounted" are to be construed broadly and can include, for example, a mounted connection, a removable connection, a mechanical connection, an electrical connection, a direct connection, an indirect connection through an intermediary, a connection between two elements, or an interaction between two elements. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.

In the description of the present invention, unless otherwise expressly specified or limited, the first feature "on" or "under" the second feature may include both the first and second features being in direct contact, and may also include the first and second features being in contact, not in direct contact, but with another feature therebetween. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.

The technical solution of the present invention is further explained by the following embodiments with reference to the accompanying drawings.

As shown in fig. 1 to 5, the present embodiment provides a converter bottom structure, which includes a bottom brick 2 disposed on the bottom surface of a furnace body 1 and a bottom protection brick 3 sandwiched in the bottom brick 2, wherein the bottom protection brick 3 includes a protection brick main body 31 and an air outlet 32, a through center hole 311 is formed on the protection brick main body 31 from the bottom end to the top end, and the center hole 311 is used for installing an air supply element; the air outlet head 32 is arranged at the top end of the brick protecting main body 31, an air permeable chamber 321 is arranged inside the air outlet head 32, the air permeable chamber 321 is communicated with the central hole 311, the air outlet head 32 is a hemispherical structure covering the opening at the top end of the central hole 311, a plurality of air holes 322 are arranged on the air outlet head 32 at intervals, the air permeable chamber 321 blows air into the furnace body 1 through the air holes 322, and the sum of the flow areas of the air holes 322 is larger than the flow area of the outlet of the air supply element.

The converter bottom structure provided by the embodiment, the central hole 311 on the brick protecting main body 31 is used for installing a gas supply element, the gas supply element blows gas into the gas permeable chamber 321, the gas is blown into the furnace body 1 through the plurality of gas holes 322, because the sum of the flow areas of the plurality of gas holes 322 is larger than the flow area of the outlet of the gas supply element, the plurality of gas holes 322 can disperse and reduce the impact force of the gas, the corrosion to refractory materials is relieved, and because the gas outlet head 32 is of a hemispherical structure, the gas blown by the bottom during smelting production can realize dispersive gas permeability through the gas outlet head 32, the occurrence time of the melting loss of the pits of the bottom-blown brick protecting 3 is greatly delayed, and the service life of the gas supply element is prolonged. The converter bottom structure provided by the embodiment can reduce the impact of gas and molten steel on refractory materials around the gas supply element, and prolong the service life of the gas supply element.

Alternatively, the venting chamber 321 is a hemispherical cavity, and the venting hole 322 penetrates through the gas head 32 along the radial direction of the gas head 32. In this embodiment, the hemispherical cavity and the hemispherical structure share a common spherical center, and the plurality of air holes 322 are uniformly disposed on the hemispherical structure, so that the air blown from the plurality of air holes 322 is uniform, and the phenomenon that the air outlet head 32 loses the function of protecting the air supply element too early due to the fact that some dense air holes 322 are subjected to strong impact force to cause severe local erosion is prevented.

Specifically, the diameter of the hemispherical cavity is larger than that of the central hole 311, so that the gas flowing out of the central hole 311 can smoothly enter the gas permeable chamber 321, and the gas is prevented from being blocked in the flowing process. The hemispherical cavity has a larger diameter, that is, the inner arc surface of the hemispherical cavity has a larger area, so that a plurality of air holes 322 can be formed in the hemispherical cavity.

Optionally, the inner wall of the vent hole 322 is covered with a temperature resistant layer. Since the temperature in the furnace body 1 is high, the inner wall of the ventilation holes 322 is covered with a temperature resistant layer in order to prevent the inner wall from being damaged by high temperature and affecting the discharge of gas. In this embodiment, the material of the temperature-resistant layer is high-temperature resistant stainless steel, and 304 stainless steel, 316, 317 stainless steel, or the like can be used. As the outlet end of the air hole 322 is close to the molten liquid in the furnace body 1, the outlet is easy to be damaged, and the temperature-resistant layer can be only covered on the inner wall of the air hole 322 close to the outlet, thereby not only protecting the air hole 322, but also saving materials.

In order to further reduce the impact force of the gas discharge, the diameter of the airing hole 322 is gradually increased from one end of the communicating airing chamber 321 to the other end. The flow in the air holes 322 is constant, the pressure of the air is gradually reduced along with the increase of the diameter, and the flow speed is gradually reduced, so that the outward discharging impact force is reduced.

As shown in fig. 3 and 4, the protective brick main body 31 has a trapezoidal cross section. Because the protective brick main body 31 and the bottom brick 2 cover the bottom surface of the whole furnace body 1 together, and the bottom surface is circular, the cross section of the protective brick main body 31 is trapezoidal, and the protective brick main body is easier to splice with the bottom brick 2 into a circle. Of course, the cross section of the brick protection main body 31 may be square, and in order to match the brick protection main body 31, the cross section of part of the hearth bricks 2 needs to be made into an irregular shape so as to be spliced with the brick protection main body 31 into a circular shape.

Specifically, the furnace bottom brick 2 comprises a plurality of first rings of bricks 21, the first rings of bricks 21 are arranged around the bottom blowing protection brick 3, and the bottom blowing protection brick 3 is 25mm-70mm higher than the first rings of bricks 21. Because the gas blown by the gas supply element has an erosion effect on surrounding materials, the materials which are closer to the gas supply element in the bottom-blowing protection brick 3 are more severely eroded, so that the bottom-blowing protection brick 3 is arranged higher than the first ring brick 21, the bottom-blowing protection brick 3 can be prevented from being eroded into pits, and the service life of the furnace bottom structure is shortened. In this embodiment, the bottom-blowing bricks 3 are 40mm higher than the first ring of bricks 21.

Optionally, the bottom bricks 2 further include a plurality of second rings of bricks 22, the second rings of bricks 22 are disposed on one side of the first rings of bricks 21 departing from the bottom blowing bricks 3, and the first rings of bricks 21 are 25mm-70mm higher than the second rings of bricks 22. The second ring of tiles 22 is arranged around the first ring of tiles 21 and the first ring of tiles 21 is higher than the second ring of tiles 22, again to prevent the formation of pits in the first ring of tiles 21. In this embodiment, the first ring of bricks 21 is 40mm higher than the second ring of bricks 22.

More specifically, the bottom bricks 2 further comprise a plurality of basic bottom bricks 23, the plurality of basic bottom bricks 23, a plurality of second rings of bricks 22, a plurality of first rings of bricks 21 and the bottom blowing protection bricks 3 cover the bottom surface of the furnace body 1, and the second rings of bricks 22 are 25mm-70mm higher than the basic bottom bricks 23. Most of the bottom surface of the furnace body 1 is a basic bottom brick 23, and the whole bottom surface is covered with the second ring of bricks 22, the first ring of bricks 21 and the bottom blowing protection brick 3, so that the gas supply element and the bottom surface of the furnace body 1 are protected. In this embodiment, the second ring of bricks 22 is 40mm higher than the base bottom bricks 23.

As shown in fig. 4 and 5, 8 bottom-blowing protection bricks 3 are arranged in the present embodiment, and the 8 bottom-blowing protection bricks 3 are uniformly distributed around the central circumference of the bottom surface. A first ring of bricks 21 and a second ring of bricks 22 are sequentially arranged around each bottom blowing protection brick 3 from near to far, and the rest positions are spliced by using basic bottom bricks 23 to cover the whole bottom surface. Of course, a third circle of bricks, a fourth circle of bricks and the like with a height lower than that of the second circle of bricks 22 can be arranged outside the second circle of bricks 22, and the specific number of the arranged circles can be determined according to the specific size of the bottom surface and the size of the bricks.

Optionally, a shim layer is laid between the bottom bricks 2 and the bottom surface of the furnace body 1. In this embodiment, after the converter is successfully opened, utilize the big surface fabric of high magnesium to carry out the benefit to the bottom surface of furnace body 1, the benefit layer can form the high magnesium anti erosion layer of angle of repose between bottom surface and bottom brick 2, and through the intermittent type nature maintenance in the production process, reduce and protect 3 erosion rate of brick to the bottom blowing, the head of giving vent to anger 32 progressively erodees and descends during the middle and later stages of the campaign, when 3 height of brick and the 23 highly unanimous at the bottom of basic bottom brick are protected in the bottom blowing, with ordinary brick, the circular seam formula air gun effect of opening the furnace is unanimous in the bottom blowing result of use, this bottom of a furnace structure can also carry out normal use, it is obvious that the life of bottom of a furnace structure obtains the extension.

Specifically, each pair of bottom-blowing bricks 3 is provided with a mounting hole 11 on the bottom surface of the furnace body 1, and in this embodiment, the gas supply element is a circular seam type bottom-blowing gun which penetrates into the central hole 311 through the mounting hole 11, so as to blow gas into the furnace body 1.

It is obvious that the above embodiments of the present invention are only examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. The utility model provides a converter bottom construction, includes that furnace bottom brick (2) that set up on furnace body (1) bottom surface and clamp locate bottom among furnace bottom brick (2) blows and protects brick (3), its characterized in that, bottom blows and protects brick (3) and include:

the protective brick comprises a protective brick main body (31), a through center hole (311) is formed from the bottom end to the top end, and the center hole (311) is used for installing an air supply element;

air outlet head (32), set up in protect the top of brick main part (31), air outlet head (32) inside has been seted up and has been passed through air chamber (321), air chamber (321) communicate in centre bore (311), air outlet head (32) are located for the cover the hemispherical structure of centre bore (311) top opening part, air outlet head (32) are gone up the interval and are provided with a plurality of bleeder vents (322), air chamber (321) pass through bleeder vent (322) to blow in furnace body (1), it is a plurality of the flow area sum of bleeder vent (322) is greater than the flow area of air feed element's export.

2. The converter bottom structure according to claim 1, wherein the ventilation holes (321) are hemispherical cavities, and the ventilation holes (322) penetrate through the gas outlet head (32) along the radial direction of the gas outlet head (32).

3. The converter bottom structure according to claim 2, characterized in that the hemispherical cavities have a diameter greater than the diameter of the central hole (311).

4. The converter bottom structure according to claim 1, wherein the inner wall of the airing hole (322) is covered with a temperature resistant layer.

5. The converter bottom structure according to claim 1, wherein the diameter of the airing hole (322) is gradually increased from one end communicating with the airing chamber (321) to the other end.

6. The converter bottom structure according to claim 1, wherein the brick guard body (31) has a trapezoidal cross section.

7. The converter bottom structure according to claim 1, characterized in that the bottom bricks (2) comprise a plurality of first rings of bricks (21), a plurality of the first rings of bricks (21) are arranged around the bottom-blowing protection bricks (3), and the bottom-blowing protection bricks (3) are 25mm to 70mm higher than the first rings of bricks (21).

8. The converter bottom structure according to claim 7, characterized in that the bottom bricks (2) further comprise a plurality of second rings of bricks (22), the second rings of bricks (22) being arranged on the side of the first ring of bricks (21) facing away from the bottom blowing bricks (3), the first ring of bricks (21) being 25mm-70mm higher than the second ring of bricks (22).

9. The converter bottom structure according to claim 8, characterized in that the bottom bricks (2) further comprise a plurality of basic bottom bricks (23), a plurality of second rings of bricks (22), a plurality of first rings of bricks (21) and the bottom protecting bricks (3) cover the bottom surface of the furnace body (1), and the second rings of bricks (22) are 25mm-70mm higher than the basic bottom bricks (23).

10. The converter bottom structure according to any of claims 1 to 9, characterized in that a shim layer is laid between the bottom bricks (2) and the bottom surface of the furnace body (1).