Ring dispersion type air brick

Abstract

The utility model discloses an annular dispersion type air brick which comprises a shell (1), a compact body (2), annular dispersion bodies (3) and an air chamber structure (4) which are matched with one another, the air chamber structure (4) is connected to the bottom of the shell (1), the air chamber structure (4) and the shell (1) form a cavity, and the annular dispersion bodies (3) are of an annular cylindrical structure and are distributed in the cavity at intervals in a concentric circle shape. Dense bodies (2) are respectively arranged between two adjacent ring dispersions (3), between the ring dispersion (3) on the outermost layer and the inner wall of the shell (1) and in the middle of the ring dispersion (3) on the innermost layer, so that the dense bodies (2) and the ring dispersions (3) are mutually nested and arranged at intervals; and an air outlet (44) on the top surface of the air chamber structure (4) is arranged over against the ring dispersion body (3). The diffusion block air brick has the advantages that the anti-purging performance of the diffusion block air brick is effectively improved, meanwhile, the contact area and the dispersion area of the diffusion gas and high-temperature molten steel are increased, and the purpose of balancing the service life of the diffusion block air brick is achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of refractory materials for refining steelmaking, in particular to an annular dispersion type porous plug. Background Art

[0002] As a gas supply component for ladle refining, the porous plug is widely used in steelmaking production. By blowing inert gases such as argon to stir the molten steel and using bubbles to adsorb inclusions, the temperature of the molten steel is made uniform and the molten steel is purified, ultimately achieving the purpose of optimizing the quality of the molten steel.

[0003] At present, the authorized patent number CN213977772U discloses a dispersion type porous plug with a composite structure, which is a porous plug with a dispersion block as the core body. Overall, it is a square dispersion block with a concentrated area in the center and a dense refractory material body around it. In addition, the authorized patent number CN219174537U also discloses a dispersion type porous plug with a new structure, that is, a brick core in which a dispersion brick body and a seat brick are connected as a whole. The dispersion brick body is on the top and the seat brick is on the bottom. Overall, the flat distribution area of the dispersion block is large and the gas volume is relatively sufficient. Although the above-mentioned dispersion type porous plugs have unique advantages in removing inclusions, due to their poor erosion resistance, soft purging resistance and small gas flow rate during use, their application in the steelmaking process is relatively limited, and further research is needed to gain full recognition from steelmaking users.

[0004] How to improve the gas permeability and service life of the dispersion type porous plug is the main research direction for expanding the application range of the dispersion type porous plug. A large gas volume can better meet the requirements of refining argon blowing. Content of the Utility Model

[0005] The purpose of the utility model is to solve the problems of limited gas permeability and short service life of the existing dispersion type porous plugs, and provide an annular dispersion type porous plug, which can effectively improve the anti-purging performance of the dispersion block porous plug, and at the same time increase the contact area and dispersion area between the dispersed gas and the high-temperature molten steel, so as to achieve the purpose of balancing the service life of the dispersion type porous plug.

[0006] In order to achieve the above purpose, the utility model adopts the following technical scheme:

[0007] An annular dispersion type porous plug includes a mutually cooperating outer shell, a dense body, an annular dispersion body and a gas chamber structure. The gas chamber structure is connected to the bottom of the outer shell and forms a cavity with the outer shell. The annular dispersion body is in an annular cylindrical structure and is spaced concentrically in the cavity. Dense bodies are respectively arranged between two adjacent annular dispersion bodies, between the outermost annular dispersion body and the inner wall of the outer shell, and in the middle part of the innermost annular dispersion body, so that the dense bodies and the annular dispersion bodies are nested and arranged at intervals;

[0008] A group of air outlet openings are arranged on the top surface of the gas chamber structure, and the air outlet openings are arranged directly opposite to the annular dispersion body.

[0009] Furthermore, the air chamber structure includes a cooperating intake pipe, a ring pipe, bronchial tubes, and an air outlet. The intake pipe is vertically disposed in the middle of the air chamber structure, and the end of the intake pipe is connected to the ring pipe through the bronchial tubes. The bronchial tubes are radially and equally distributed at an angle with the intake pipe as the center. The ring pipe is concentrically distributed with the intake pipe as the center. The air outlets are evenly distributed at the positions where the top surface of the ring pipe contacts the ring diffuser, so as to facilitate the continuous supply of inert gas from the air chamber structure to the ring diffuser through the air outlets, and finally obtain dispersed bubbles.

[0010] Furthermore, the outer shell is a conical cylindrical structure made of stainless steel, and an intake pipe hole adapted to the intake pipe is provided at its bottom. The intake pipe of the air chamber structure vertically passes through the intake pipe hole and extends out of the outer shell. The outer shell is tightly connected to the air chamber structure to ensure a tight and seamless connection between the two, forming a closed system in which the dense body and the ring diffuser are filled inside.

[0011] Furthermore, the dense body is a conical ring structure, which sequentially includes a first dense body, a second dense body, and a third dense body from the inside to the outside. The inner diameter of the cross-section of each dense body increases sequentially from the inside to the outside. The space between the dense bodies is filled with the ring diffuser to form a continuous refractory material permeable brick core.

[0012] Furthermore, the dense body is a castable without baking or a high-strength structure after high-temperature heat treatment.

[0013] Preferably, the dense body is a corundum spinel preform, the alumina content of its castable is above 88%, the dry compressive strength is above 80 MPa, and the porosity is 10%.

[0014] Furthermore, the ring diffuser is a vibration or ramming formed structure, or a dispersion-stabilized body after high-temperature heat treatment.

[0015] Preferably, the ring diffuser is a corundum diffuser, its ring thickness is 15 mm, the compressive strength after heat treatment is above 50 MPa, and the open porosity is distributed between 26% and 32% to provide a stable and divergent air permeation channel for argon.

[0016] Compared with the prior art, the advantages of the technical solution of the present utility model are specifically as follows:

[0017] (1) The diffuser of the permeable brick of the present utility model is designed as an annular body, which increases the coverage area of the equal-section diffuser, thereby increasing the contact area of the diffused gas after passing through the diffuser.

[0018] (2) The diffuser of the present utility model no longer uses an integral cubic diffuser block, but two to three mutually isolated and dispersed annular ring diffusers, which are separated by the dense body, further increasing the coverage area of the equal-section diffuser.

[0019] (3) The annular dispersion body of the present utility model is segmented by the dense body, forming an alternating arrangement of the dense body and the annular dispersion body. The dense body protects the dispersion body to compensate and strengthen the anti-scouring strength of the annular dispersion body. At the same time, the overall strength of the dense body is reduced due to being segmented by the annular dispersion body, thereby achieving the effect of balancing the overall strength of the composite permeable brick, optimizing the use effect of the dispersion permeable brick, and extending the service life of the dispersion body;

[0020] (4) Through the corresponding design of the pipe network and the air outlet of the air chamber structure of the present utility model, the stability of the air chamber volume and the kinetic energy directionality of the gas entering the dispersion body are increased, which helps the gas to pass through and flow out more effectively. DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a longitudinal cross-sectional internal structure diagram of the annular dispersion type permeable brick of the present utility model;

[0022] Figure 2 It is a transverse cross-sectional internal structure diagram of the annular dispersion type permeable brick of the present utility model;

[0023] Figure 3 It is a front view of the air chamber structure of the present utility model;

[0024] Figure 4 It is a top view of the air chamber structure of the present utility model. SPECIFIC EMBODIMENTS EXAMPLE

[0025] To make the present utility model more clear and understandable, the following further describes an annular dispersion type permeable brick of the present utility model in conjunction with the drawings. The specific embodiments described herein are only used to explain the present utility model and are not used to limit the present utility model.

[0026] Refer to Figure 1 , an annular dispersion type permeable brick, including a mutually cooperating outer shell 1, a dense body 2, an annular dispersion body 3, and an air chamber structure 4, forming a main core body of the permeable brick with ring-by-ring assistance through the structural body of the dispersion isolation area.

[0027] Refer to Figure 1 and Figure 2 , the air chamber structure 4 is connected to the bottom of the outer shell 1 and forms a cavity with the outer shell 1. The annular dispersion body 3 is in the shape of an annular cylinder and is spaced concentrically in the cavity. Dense bodies 2 are respectively provided between two adjacent annular dispersion bodies 3, between the outermost annular dispersion body 3 and the inner wall of the outer shell 1, and in the middle part of the innermost annular dispersion body 3, so that the dense bodies 2 and the annular dispersion bodies 3 are nested and spaced alternately;

[0028] The compact body 2 is also a conical ring structure, which successively includes a first compact body 21, a second compact body 22, and a third compact body 23 from the inside to the outside. The inner diameter of the cross-section of each compact body 2 increases successively from the inside to the outside. The spaces between the compact bodies 2 are filled with ring dispersion bodies 3 to form a continuous refractory material permeable brick core. According to the size of the cross-sectional area of the brick body, 2 to 3 ring dispersion bodies and 3 to 4 structural members of the compact body are designed.

[0029] In this embodiment, the outer shell 1 is a conical cylinder made of 304 stainless steel with a thickness of 1 mm.

[0030] In this embodiment, the ring dispersion body 3 is a corundum dispersion body, which is vibrationally pressure-formed into an annular cone, and then forms a porous structure with a certain strength after curing, drying, and heat treatment at 1550 °C for 6 h. The ring thickness is 15 mm, the compressive strength after heat treatment is above 50 MPa, and the open porosity is distributed between 26% and 32%, providing a stable and divergent permeable channel for argon.

[0031] In this embodiment, the compact body 2 is a corundum spinel preform. A thin glue film layer is applied to the inner and outer vertical surfaces of 2 ring dispersion bodies to seal the vertical surfaces, and then they are nested and fixed in a designed fixture at intervals of 15 - 20 mm. The outer shell directly serves as the outer body of the combined vertical mold. Then, the corundum spinel casting material is poured and filled in the space between the outer shell and the ring dispersion bodies and in the vicinity. After curing for 12 - 24 h, it is demolded, and then cured for 1 d and dried and baked at 300 - 500 °C to remove moisture and eliminate the glue film layer. The alumina content of this compact body casting material is above 88%, the dry compressive strength is above 80 MPa, and the porosity is about 10%.

[0032] See Figure 1 、 Figure 3 and Figure 4 , the gas chamber structure 4 includes a cooperating intake pipe 41, a ring pipe 42, a bronchial pipe 43, and an air outlet 44. The intake pipe 41 is vertically arranged in the middle of the gas chamber structure 4, and the end of the intake pipe 41 is connected to the ring pipe 42 through the bronchial pipe 43. The bronchial pipes 43 are radially and equally angularly distributed around the intake pipe 41. The ring pipe 42 is concentrically annularly distributed around the intake pipe 41. The air outlets 44 are evenly distributed at the position where the top surface of the ring pipe 42 contacts the ring dispersion body 3, so as to continuously supply inert gas from the gas chamber structure to the ring dispersion body through the air outlets, and finally obtain dispersed bubbles;

[0033] An intake pipe hole 1a adapted to the intake pipe 41 is provided at the bottom of the outer shell 1. The intake pipe 41 of the gas chamber structure 4 vertically passes through the intake pipe hole 1a and extends out of the outer shell 1. The outer shell 1 is tightly connected to the gas chamber structure 4 to ensure a tight and seamless connection between the two, forming a closed system in which the compact body and the ring dispersion body are filled inside.

[0034] In this embodiment, both the bronchus 43 and the annular trachea 42 of the air chamber structure 4 are stainless steel hollow tubes with an outer diameter of 18 mm. The air outlet 44 is opened on the contact surface with the annular diffuser 3, that is, the top of the annular trachea 42, and the aperture size is 6-8 mm. There are a total of 36 annular air holes. The actual quantity and the hole size can be determined according to requirements.

[0035] The annular diffuser and the dense body of the annular diffuser type permeable brick of the present utility model form a seamless connection combined body permeable brick main core through reasonable process production and matching. Through the connection of the air chamber structure and the outer shell of the annular diffuser type permeable brick, the combined permeable brick main core that has been combined together forms a complete combined body - permeable brick; and the air chamber structure serves as a ventilation and air chamber to supply gas to the diffuser in a directional manner. Inert gas such as argon enters through the inlet pipe, enters the annular trachea through the bronchus, and finally flows to the annular diffuser through the air outlet. The annular diffuser type permeable brick of the present utility model improves the anti-blowing performance of the traditional diffuser block permeable brick, increases the contact area and dispersion area between the diffused gas and the high-temperature molten steel, and prolongs the service life of the diffused permeable brick.

[0036] In addition to the above embodiments, the present utility model may have other implementation manners. Any technical solutions formed by equivalent replacement or equivalent transformation fall within the protection scope required by the present utility model.

Claims

1. A ring-dispersion type permeable brick, comprising a mutually cooperating outer shell (1), a dense body (2), a ring-dispersion body (3) and an air chamber structure (4), characterized in that: The air chamber structure (4) is connected to the bottom of the outer shell (1) and forms a cavity with the outer shell (1). The ring-dispersion body (3) is in a ring-shaped cylindrical structure and is spaced concentrically in the cavity. Dense bodies (2) are respectively arranged between two adjacent ring-dispersion bodies (3), between the outermost ring-dispersion body (3) and the inner wall of the outer shell (1), and in the middle part of the innermost ring-dispersion body (3), so that the dense bodies (2) and the ring-dispersion bodies (3) are nested and spaced alternately; A set of air outlet openings (44) are provided on the top surface of the air chamber structure (4), and the air outlet openings (44) are arranged facing the ring-dispersion body (3).

2. The ring-dispersion type permeable brick according to claim 1, characterized in that: The air chamber structure (4) comprises a mutually cooperating air inlet pipe (41), a ring air pipe (42), a bronchus (43) and an air outlet (44). The air inlet pipe (41) is vertically arranged in the middle of the air chamber structure (4), and the end of the air inlet pipe (41) is connected to the ring air pipe (42) through the bronchus (43). The bronchi (43) are radially and equally angularly distributed around the air inlet pipe (41). The ring air pipe (42) is concentrically ring-shapedly distributed around the air inlet pipe (41). The air outlet openings (44) are evenly distributed at the position where the top surface of the ring air pipe (42) contacts the ring-dispersion body (3).

3. The ring-dispersion type permeable brick according to claim 2, characterized in that: The outer shell (1) is a conical cylindrical structure made of stainless steel, and an air inlet pipe hole (1a) adapted to the air inlet pipe (41) is provided at its bottom. The air inlet pipe (41) of the air chamber structure (4) vertically passes through the air inlet pipe hole (1a) and extends out of the outer shell (1), and the outer shell (1) is tightly connected to the air chamber structure (4).

4. The ring-dispersion type permeable brick according to any one of claims 1 to 3, characterized in that: The dense body (2) is a conical ring structure, which successively comprises a first dense body (21), a second dense body (22) and a third dense body (23) from inside to outside, and the inner diameter of the cross-section of each dense body (2) increases successively from inside to outside. The spaces between the dense bodies (2) are filled with the ring-dispersion bodies (3) to form a continuous refractory material permeable brick core.

5. The ring-dispersion type permeable brick according to any one of claims 1 to 3, characterized in that: The dense body (2) is a non-baking castable body or a high-strength structure body subjected to high-temperature heat treatment.

6. The ring-dispersion type permeable brick according to claim 5, characterized in that: The dense body (2) is a corundum spinel preform, and the alumina content of its castable is more than 88%, the dry compressive strength is more than 80 MPa, and the porosity is 10%.

7. The ring-dispersion type permeable brick according to any one of claims 1 to 3, characterized in that: The ring-dispersion body (3) is a vibration or ramming forming structure, or a dispersion-stabilized body subjected to high-temperature heat treatment.

8. The ring-dispersion type permeable brick according to claim 7, characterized in that: The ring dispersion body (3) is a corundum dispersion body, with a ring thickness of 15 mm, a compressive strength after heat treatment of more than 50 MPa, and an open porosity distribution of 26% - 32%.

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