08
2020
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02
Construction and maintenance of permeable bricks for converters
Source： KE CHUANG New Material
Release time：2020-02-08 17:55
Permeable bricks are crucial equipment in the converter process. Many types exist, including split-type permeable bricks consisting of a permeable core and a base brick. Considering their development, manufacturers generally equip them with base bricks to protect the core air supply components. Other parts, such as backing bricks, may also be included. The lifespan of permeable bricks depends not only on their structural characteristics, bottom-blowing pressure, material composition, and operating processes but also on the quality of their installation.
Permeable Brick It is a key equipment for compound blowing. There are many types, among which the split permeable brick includes two parts: permeable core and seat brick. From its development, in order to protect the core air supply components, manufacturers generally have seat bricks, and there will be other components, such as cushion bricks. The construction of air supply components permeable bricks refers to the construction of a set of combined bricks such as permeable cores and seat bricks at the bottom of the furnace. The service life of permeable bricks is related to its own structural characteristics, bottom blowing pressure, material composition, operation process, etc., and also to its construction quality.
(Picture) Converter
In the actual production of steel mills, Permeable core Due to the adoption of , the temperature change of the surrounding refractory materials is drastic, and the stirring force of the internal liquid is very strong. Therefore, the consumption of bricks at the bottom of the furnace, especially around the tuyere, will be faster. Therefore, refractory materials with high corrosion resistance, low expansion, and high strength are used at the bottom of the furnace. In addition, the construction method and quality also greatly affect its service life. As the cross-sectional shape of the permeable brick increases, the thermal stress also increases, making it easier to peel off and wear. Therefore, the method of combining permeable core and seat brick is mostly used at present, which can alleviate the expansion and contraction caused by temperature changes around it and the whole furnace bottom. The construction should be tight, the gap between two adjacent bricks should be minimized, the upper part of the bricks should be laid flat, and no knotting material or refractory mixed powder should be filled between the working layer and the safety layer. The permeable brick should be perpendicular to the furnace bottom. After the furnace bottom is cut, the top of the permeable brick should be corrected horizontally, with appropriate concavity and convexity. In addition, the completed furnace bottom must be stored on a raised platform to prevent damage to the tailpipe of the permeable brick.
In addition, in addition to ensuring the quality of construction, certain maintenance work is also needed. Compared with top blowing, the stirring force of converter blowing and bottom blowing is weaker, the partial pressure of carbon monoxide in the furnace is higher, and the metallurgical characteristics are not good, but the furnace bottom life is longer.
(Picture) Anti-seepage permeable brick
The more intense the steel stirring, the faster the flow rate of molten steel on the furnace bottom, and the faster the consumption of permeable bricks. The flow of molten steel is also affected by the arrangement of brick cores. In the furnace bottom with multiple cores, the smaller the distance between them, the greater the flow rate of molten steel on the bottom surface, and thus the greater the consumption. Only blowing inert gases such as nitrogen and argon will cause much less consumption than blowing oxygen. Reasonable layout structure, material selection, processing and forming, assembly, and construction all have an impact on the service life of permeable bricks.
Kechuang New Materials has been professionally producing permeable bricks for 22 years. Various types of structures are reasonable, and the material composition can be customized according to customer needs. It is suitable for the smelting environment of molten steel in various steel mills. It is a professional manufacturer and worthy of trust.
From Luoyang Kechuang New Materials Co., Ltd.: https://www.kcnh.com/
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