Bottom argon blowing breathable refractory brick for metallurgical furnace

Abstract

The utility model relates to the field of refractory brick materials, in particular to a bottom argon blowing breathable refractory brick for a metallurgical furnace. A bottom argon blowing breathable refractory brick for a metallurgical furnace comprises a shell, a breathable brick core and an air channel are arranged in the shell, a bonding layer is arranged between the shell and the breathable brick core, an air chamber is arranged between the breathable brick core and the air channel, an air distribution plate is arranged in the air chamber and located over the air channel, and the bonding layer is arranged between the shell and the air channel. A plurality of dispersion sheets with V-shaped structures are also arranged at the bottom of the air brick core; and the air passage is connected with an air inlet pipe. The bottom argon blowing air brick is simple in structure, adopts a diffuse type ventilation channel, is uniform in gas distribution and can resist metal permeation, and the service life of the brick body can be effectively prolonged.

Description

TECHNICAL FIELD

[0001] The utility model relates to refractory brick material field, concretely is a kind of bottom argon permeable refractory brick for metallurgical furnace. BACKGROUND

[0002] The bottom argon permeable brick of intermediate frequency induction furnace is a kind of refractory material for metallurgical process, mainly used to blow inert gas (such as argon) into the molten pool through the furnace bottom, to optimize the uniformity of melt composition, temperature distribution and impurity removal. The argon gas is uniformly injected into the molten pool by the porous structure of the permeable brick, which promotes the stirring of the melt and can reduce the segregation of components. It can also accelerate heat convection, avoid local overheating or cold area, and reduce manual stirring and shorten smelting time. In order to ensure the uniformity of the gas distribution effect, the bottom argon permeable brick in the prior art has a complex structure, which is prone to low yield during firing, greatly increasing the cost of the product. SUMMARY

[0003] The utility model discloses a kind of bottom argon permeable refractory bricks for metallurgical furnace, the bottom argon permeable brick of this kind of structure is simple and uses dispersion type gas-permeable passage, gas distribution is uniform and can resist metal penetration, which can effectively improve the service life of brick body.

[0004] To solve the problems of the prior art, the utility model discloses a kind of bottom argon permeable refractory bricks for metallurgical furnace, including shell, gas-permeable brick core and gas passage are arranged in shell, bonding layer is arranged between shell and gas-permeable brick core, gas chamber is arranged between gas-permeable brick core and gas passage, gas distribution plate is arranged in gas chamber, the gas distribution plate is located the upside of gas passage, a plurality of "V" shaped structure dispersion sheets are further arranged at the bottom of gas-permeable brick core, and the gas passage is connected with gas inlet pipe.

[0005] Preferably, the gas distribution plate is in arc shape with low middle and high sides.

[0006] Preferably, the gas distribution plate is fixed in the shell by two supporting rods.

[0007] Preferably, the gas-permeable brick core is in trapezoidal shape with wide top and narrow bottom.

[0008] Preferably, the gas-permeable brick core and the top of shell are provided with nano-alumina layer.

[0009] Preferably, the gas chamber is provided with multiple layers of "V" shaped dispersion sheets.

[0010] Preferably, there is a distance between the gas distribution plate and the dispersion sheets.

[0011] Preferably, the top of the adjacent two dispersion sheets does not contact, and there is a distance between the dispersion sheets.

[0012] The beneficial effects of this utility model are as follows: 1. The permeable brick core has a trapezoidal structure that is wider at the top and narrower at the bottom, resulting in a larger area for gas outlets and allowing for the precipitation of more bubbles, effectively reducing the segregation of melt components. 2. An arc-shaped gas distribution plate with a lower center and higher sides is set in the gas chamber. Argon gas entering from the gas channel is first diverted to both sides of the gas chamber, effectively taking into account both sides of the permeable brick core with its wider top and narrower bottom structure, ensuring the uniformity of gas outlet from the brick. If the gas enters the permeable brick core directly from the gas chamber without passing through the arc-shaped upward-curving gas distribution plate, the gas mainly enters the middle of the permeable brick core, with less gas outlet at the sides, affecting the uniformity of melt components. 3. Several "V"-shaped dispersion plates are set at the bottom of the permeable brick core, with distances between the dispersion plates and the gas distribution plate, as well as between adjacent dispersion plates. The gas flow dispersed from the gas distribution plate is dispersed in the gas chamber and then cut and diverted into the permeable brick core through the gaps between multiple dispersion plates, effectively ensuring the uniformity of gas entering the permeable brick core. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the suspension rods used in suspended brick arches.

[0014] Figure label:

[0015] 1. Shell; 2. Breathable brick core; 3. Air duct; 4. Adhesive layer; 5. Air chamber; 6. Air distribution plate; 7. Dispersion sheet; 8. Air inlet pipe; 9. Nano-alumina layer; 10. Support rod. Detailed Implementation

[0016] The present invention will be further described below with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present invention, and should not be used to limit the scope of protection of the present invention.

[0017] like Figure 1 As shown, a bottom-blown argon-permeable refractory brick for metallurgical furnaces includes a shell 1, a permeable brick core 2 and a gas channel 3 disposed inside the shell 1, an adhesive layer 4 disposed between the shell 1 and the permeable brick core 2, a gas chamber 5 disposed between the permeable brick core 2 and the gas channel 3, a gas distribution plate 6 disposed inside the gas chamber 5, the gas distribution plate 6 being located directly above the gas channel 3, and several "V"-shaped dispersion plates 7 disposed at the bottom of the permeable brick core 2, and the gas channel 3 being connected to an inlet pipe 8.

[0018] Among them, the permeable brick core 2 is made of magnesium aluminum spinel, which has high high temperature strength, good slag penetration resistance, and is environmentally friendly and pollution-free; the permeable brick core 2 uses a pore-forming agent to form a three-dimensional network of pores with a porosity of 30-40% and a pore size of 50-200μm, forming a network of interconnected pores, resulting in more uniform airflow.

[0019] Among them, the shell 1 is densified by high-temperature sintering with a porosity of <15%, which can effectively prevent molten steel from penetrating. The thickness is 20-50mm, which can effectively withstand high temperature and chemical corrosion.

[0020] Among them, the bonding layer 4, as a transition layer, is made of refractory mortar, which can effectively alleviate the cracking caused by the difference in thermal expansion coefficient between the shell 1 and the permeable brick core 2, and can improve the integrity of the brick body.

[0021] Among them, the air chamber 5 serves as a gas buffer structure, where the gas is fully mixed and distributed. The air distribution plate 6, located at the bottom of the air chamber 5, effectively ensures the air distribution on both sides. Instead, the "V"-shaped dispersion plate 7, located at the top of the air chamber 5, disperses the airflow into several streams, effectively ensuring the overall airflow distribution of the permeable brick core 2.

[0022] The air distribution plate 6 has an arc-shaped structure that is low in the middle and high on both sides. The air distribution plate 6 is fixed inside the shell 1 by two support rods 10. The airflow is dispersed to both sides after passing through the air distribution plate 6, which can effectively ensure the gas distribution on both sides of the breathable brick core 2.

[0023] The permeable brick core 2 has a trapezoidal structure that is wider at the top and narrower at the bottom. The top of the permeable brick core 2 is in contact with the melt. The larger the top area, the more bubbles can be precipitated, thus optimizing the uniformity of melt composition, temperature distribution, and impurity removal.

[0024] The breathable brick core 2 and the top of the shell 1 are provided with a nano-alumina layer 9. Spraying a layer of nano-alumina layer 9 onto the areas in direct contact with the molten material effectively improves the brick's resistance to high-temperature erosion and extends its service life to over 100 furnace cycles. Figure 1 To make it clear, the nano-alumina layer 9 is directly applied to the breathable brick core 2. In the actual product, the nano-alumina layer 9 is thin and light when sprayed onto the breathable brick core, and it does not impede the breathability of the breathable brick core.

[0025] The air chamber 5 is equipped with multiple layers of "V"-shaped dispersion plates 7. There is a distance between the air distribution plate 6 and the dispersion plates 7. The tops of two adjacent dispersion plates 7 do not contact each other, and there is a distance between the dispersion plates 7.

[0026] When the permeable brick is in use, argon gas enters the gas channel 3 inside the brick body through the air inlet pipe 8, and then is distributed in the gas chamber 5 through the gas distribution plate 6. After being analyzed between the diffusion plates 7, it enters the permeable brick core 2, and finally precipitates out from the top of the permeable brick core 2 through the air pores connected inside the permeable brick core 2.

[0027] To further improve the uniformity of air distribution, multiple layers of "V"-shaped dispersion plates 7 can be installed in the air chamber, with each layer of dispersion plates 7 designed in an alternating pattern.

[0028] The above merely is the preferred implementation manner of the present application, and it should be noted that, for the ordinary skilled in the art, without departing from the technical principles of the present application, a number of improvements and deformations can be made, and these improvements and deformations should also be considered as the protection scope of the present application.

Claims

1. A bottom-blown argon-permeable refractory brick for metallurgical furnaces, comprising a shell, wherein a permeable brick core and gas channels are disposed within the shell, characterized in that: An adhesive layer is provided between the shell and the breathable brick core. An air chamber is provided between the breathable brick core and the air duct. An air distribution plate is provided in the air chamber. The air distribution plate is located directly above the air duct. Several spaced "V"-shaped diffusion sheets are also provided at the bottom of the breathable brick core. The air duct is connected to the air inlet pipe.

2. The bottom-blown argon-permeable refractory brick for metallurgical furnaces according to claim 1, characterized in that: The air distribution plate has an arc-shaped structure that is low in the middle and high on both sides.

3. The bottom-blown argon-permeable refractory brick for metallurgical furnaces according to claim 2, characterized in that: The air distribution plate is fixed inside the housing by two support rods.

4. The bottom-blown argon-permeable refractory brick for metallurgical furnaces according to claim 1, characterized in that: The breathable brick core has a trapezoidal structure that is wider at the top and narrower at the bottom.

5. The bottom-blown argon-permeable refractory brick for metallurgical furnaces according to claim 1, characterized in that: The breathable brick core and the top of the shell are provided with a nano-alumina layer.

6. The bottom-blown argon-permeable refractory brick for metallurgical furnaces according to claim 1, characterized in that: The air chamber is equipped with multiple layers of "V"-shaped dispersion sheets.

7. The bottom-blown argon-permeable refractory brick for metallurgical furnaces according to claim 3, characterized in that: There is a distance between the air distribution plate and the diffusion sheet.

8. The bottom-blown argon-permeable refractory brick for metallurgical furnaces according to claim 1, characterized in that: The tops of two adjacent diffusion sheets do not touch, and there is a distance between the diffusion sheets.

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