Composite magnesite-chrome brick

Abstract

The utility model provides a kind of composite magnesium-chrome brick, the utility model includes refractory brick body, refractory brick body is pressed and sintered by magnesite-chrome composite material, and the through heat dissipation passage is set in refractory brick body, one end of heat dissipation passage is equipped with air inlet, the other end of heat dissipation passage is equipped with air outlet, heat dissipation passage is spiral type, the upper end of refractory brick body is provided with high-temperature-resistant ceramic coating, and the lower end of refractory brick body is provided with porous soundproof board.The utility model can consider efficient heat dissipation, stable splicing, sound insulation and noise reduction and the function of adapting special-shaped kiln, prolong the service life of brick body, improve kiln operation stability, reduce energy consumption and construction difficulty.

Description

Technical Field

[0001] This utility model relates to the field of magnesium-chrome brick technology, and in particular to a composite magnesium-chrome brick. Background Technology

[0002] Composite magnesia-chrome bricks are alkaline refractory materials made primarily from magnesia (MgO) and chromite (FeCr2O4) through batching, molding, and high-temperature sintering. Due to their high-temperature resistance, slag erosion resistance, and good thermal shock stability, they are widely used in the linings of high-temperature equipment such as converters, electric arc furnaces, and RH refining furnaces in the metallurgical industry, serving as a key material for ensuring the safe and stable operation of high-temperature industrial kilns. However, existing technologies still have limitations. Traditional composite magnesia-chrome bricks are mostly solid structures, leading to the accumulation of large amounts of heat inside the bricks during kiln operation. This heat cannot be dissipated in time, and prolonged high temperatures accelerate brick aging, causing cracking and spalling, shortening service life, increasing the frequency of kiln shutdowns for maintenance, and impacting production efficiency. Therefore, we propose a composite magnesia-chrome brick to address these issues. Utility Model Content

[0003] To address the shortcomings mentioned above, this utility model provides a composite magnesia-chrome brick that combines efficient heat dissipation, stable splicing, sound insulation and noise reduction, and compatibility with irregularly shaped kilns, thereby extending the service life of the brick, improving the operational stability of the kiln, and reducing energy consumption and construction difficulty.

[0004] To solve the above problems, the technical solution provided by this utility model is as follows:

[0005] A composite magnesia-chrome brick includes a refractory brick body, which is formed by pressing and sintering a magnesia-chrome composite material. The refractory brick body has a through heat dissipation channel inside, with an air inlet at one end and an air outlet at the other end. The heat dissipation channel is spiral-shaped. The upper end of the refractory brick body is provided with a high-temperature resistant ceramic coating, and the lower end of the refractory brick body is provided with a porous sound insulation board.

[0006] Furthermore, the inner wall of the spiral heat dissipation channel is coated with a silicon nitride high-temperature resistant coating.

[0007] Furthermore, a first connector is fixedly connected to the left end of the refractory brick body, and a second connector is fixedly connected to the right end; the first connector is a trapezoidal boss structure, and the second connector is a trapezoidal groove structure adapted to the trapezoidal boss.

[0008] Furthermore, the connection surface between the porous sound insulation board and the refractory brick body is bonded by high-temperature phosphate bonding.

[0009] Furthermore, the cross-section of the refractory brick body is trapezoidal.

[0010] Compared with the prior art, the present invention has the following advantages:

[0011] 1. High-efficiency heat dissipation and extended service life: Existing technologies lack effective heat dissipation structures, and heat accumulation can easily lead to brick cracking. This utility model increases the heat dissipation area through a spiral heat dissipation channel, and the inner wall silicon nitride coating ensures unobstructed channels, which can quickly dissipate heat from inside the brick, reduce high-temperature stress damage, significantly extend the service life of the brick, and reduce the frequency of replacement.

[0012] 2. Stable splicing and reduced energy consumption: Traditional flat splicing is prone to gaps and heat leakage; this utility model adopts a matching splicing structure of trapezoidal protrusions and grooves, combined with a tight fit design, which effectively reduces splicing gaps, avoids heat loss in the kiln, makes the kiln temperature more uniform, reduces the energy consumption required to maintain high temperature, and improves the stability of kiln operation.

[0013] 3. Sound insulation and improved experience: Existing technologies lack sound insulation and have poor adaptability; this utility model absorbs noise through a porous sound insulation board at the lower end, improving the working environment; at the same time, the trapezoidal cross-section can be directly adapted to the inner wall of irregular kilns without additional cutting and adjustment, reducing construction difficulty and material waste, and improving construction efficiency.

[0014] In summary, this type of composite magnesia-chrome brick has wide applicability, addressing the problem mentioned in the background that existing technologies still suffer from the issue that traditional composite magnesia-chrome bricks are mostly solid structures, which easily accumulate a large amount of heat inside the brick body during kiln operation. This heat cannot be dissipated in time, and long-term high temperatures will accelerate the aging of the brick body, leading to cracking and peeling, shortening its service life, increasing the frequency of kiln shutdowns for maintenance, and affecting production efficiency. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of this utility model.

[0016] Explanation of key component symbols:

[0017] 1-Refractory brick body, 2-Heat dissipation channel, 201-Air inlet, 202-Air outlet, 3-Porous sound insulation board, 4-High temperature resistant ceramic coating, 5-First connector, 6-Second connector. Detailed Implementation

[0018] To make the objectives, technical solutions and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and examples, but the examples given are not intended to limit the present utility model.

[0019] For example Figure 1As shown, the embodiment of this utility model includes a refractory brick body 1, which is made of magnesia-chromium composite material through pressing and sintering. The core of the brick body is the refractory brick body 1, which is made of magnesia-chromium composite material through pressing and sintering. Magnesia-chromium material has excellent high temperature resistance and corrosion resistance, and can resist the scouring and corrosion of high temperature melt and flue gas, meeting the requirements of long-term high temperature operation of kiln. The cross-section of the body is designed as a trapezoid, which not only enhances the structural stability of the brick body itself, but also forms a staggered fit during kiln construction, improving the overall sealing and anti-stripping ability of the lining. To enhance heat dissipation performance, a continuous spiral heat dissipation channel 2 is opened inside the brick body. One end of the channel is equipped with an air inlet 201 and the other end with an air outlet 202. The spiral structure can extend the residence time of the cooling airflow in the channel, expand the heat exchange area, and efficiently remove the heat absorbed by the brick body, avoiding local overheating that could cause the brick body to crack. At the same time, the inner wall of the channel is coated with a silicon nitride high-temperature resistant coating, which can not only improve the wear resistance of the inner wall and prevent the channel from being damaged by the high-temperature airflow, but also reduce the heat conduction loss to the channel wall, further optimizing the heat dissipation efficiency.

[0020] Functional layers are set on the upper and lower surfaces of the refractory brick body 1, taking into account both protection and noise reduction: the high-temperature resistant ceramic coating 4 at the upper end can enhance the high-temperature strength and oxidation resistance of the brick surface, reduce the erosion of the brick surface by high-temperature flue gas, and extend the service life of the brick; the porous sound insulation board 3 at the lower end is tightly bonded to the brick body by high-temperature phosphate bonding. The porous structure can effectively absorb the noise generated during the operation of the kiln, reduce the noise pollution in the workshop environment, and the phosphate adhesive ensures that the sound insulation board does not fall off under high-temperature conditions, ensuring long-term sound insulation effect.

[0021] To improve the ease of construction and overall stability, a first connector 5 and a second connector 6 are designed at both ends of the brick body: the first connector is a trapezoidal protrusion structure, and the second connector is a matching trapezoidal groove structure. During construction, the protrusions and grooves of adjacent bricks can be precisely spliced ​​to form a mechanical interlock, avoiding the problems of loosening and air leakage caused by traditional flat joint splicing. At the same time, there is no need to use a large amount of refractory mortar, simplifying the construction process and improving the overall sealing and structural strength of the kiln lining.

[0022] The above description of the disclosed embodiments enables those skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A composite magnesia-chrome brick, comprising a refractory brick body (1), characterized in that, The refractory brick body (1) is made of magnesium chromium composite material by pressing and sintering. The refractory brick body (1) has a through heat dissipation channel (2) inside. One end of the heat dissipation channel (2) is provided with an air inlet (201) and the other end of the heat dissipation channel (2) is provided with an air outlet (202). The heat dissipation channel (2) is spiral. The upper end of the refractory brick body (1) is provided with a high temperature resistant ceramic coating (4) and the lower end of the refractory brick body (1) is provided with a porous sound insulation board (3).

2. The composite magnesia-chrome brick as described in claim 1, characterized in that, The inner wall of the spiral heat dissipation channel (2) is coated with a silicon nitride high-temperature resistant coating.

3. The composite magnesia-chrome brick as described in claim 2, characterized in that, The left end of the refractory brick body (1) is fixedly connected to a first connector (5), and the right end is fixedly connected to a second connector (6); the first connector (5) is a trapezoidal boss structure, and the second connector (6) is a trapezoidal groove structure adapted to the trapezoidal boss.

4. A composite magnesia-chrome brick as described in claim 3, characterized in that, The connection surface between the porous sound insulation board (3) and the refractory brick body (1) is bonded by high temperature with phosphate.

5. A composite magnesia-chrome brick as described in claim 4, characterized in that, The cross-section of the refractory brick body (1) is trapezoidal.

Images