A Brief Introduction to Burner Block
2025-10-14
1 Definition and classification of burner bricks
Burner bricks are the core refractory components of the combustion in industrial fuel furnaces, which need to be used with the burner of high temperature kilns such as blast furnace, lime kiln, heating furnace, etc. Its modular structure (such as the upper brick body and the lower brick body are connected by an anti-slip structure) offsets thermal stress through reserved expansion joints, effectively solving the problem that the burner brick is prone to crack when heated, and facilitating transportation and installation.
According to the material, it can be divided into high alumina, corundum and other types and it is produced by casting precast process, which has the characteristics of no need for on-site maintenance and custom-made special-shaped components. During the combustion process, burner brick controls the flame shape (such as disk flame) through special structures such as bell mouth, which improves the thermal efficiency and reduces the energy consumption.
2 Stucture design and material properties
The burner brick is composed of a modular brick body (upper brick body and lower brick body). The joint of the two forms a round burning. The gap is reserved with expansion joints to relieve thermal expansion stress. The anti-slip structure fixes the upper and lower brick bodies through mating parts such as concave and or refractory connection parts (such as stainless steel screws) to prevent relative displacement. Its geometric shape includes parallel straight lines, concentric circles and other types.
Material selection based on the difference of working temperature. High alumina is suitable for medium and high temperature environments, while corundum mullite and silicon carbide are used for higher temperature corrosive scenarios. The precast process makes the product have precise size, resistance to sudden cold and sudden heat, and other properties, which can meet the customization needs of large specialshaped components.
3 Flame control function
The bell-mouthed burner brick of the flat flame burner is designed through fluid dynamics, which makes the flame form disk shape with a thickness of 100~200mm. This structure optimizes the temperature field distribution inside the furnace, achieves rapid and uniform heating of the work, and at the same time reduces the oxidation burn-off rate by 15%~20%. For example, in blast furnace application, the flat flame burner uses a bell-mouthed burner brick, which makes the flame form a stable disk shape.
4 Application and technical development
The modular design improves the replacement efficiency of bricks by 30%~50%, especially for kilns with frequent maintenance [1]. After China introduced the flat flame burner technology in the 198s, the structure of burner bricks has been continuously iterated, such as enhancing the insulation performance by adding a layer of refractory fiber. In the lime kiln, corum burner bricks can withstand temperatures above 1600℃, and the service life reaches 12~18 months; while in the vertical furnace oxygen-enriched condition, burner bricks need to be used with porous medium materials to optimize fuel mixing efficiency.
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