What problems still need to be solved in the application of chrome-corundum bricks?

The operating environment of the gasifier itself is very bad, and its combustion reaction is strong reducing atmosphere, and it also suffers from the continuous erosion of acid slag and high-speed fluid erosion. Due to the need for slag disposal, the working temperature of coal water sludge gasifier is generally 50-100℃ higher than the melting point of coal ash slag, liquid slag causes serious erosion of refractory materials. There are still many problems that still need to be improved in the application of chrome-corundum brick in the gasifier.

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Common refractory materials are China refractory brick, high-grade aluminum brick, high-grade aluminum refractory brick, heat-insulated brick, high-grade aluminum wear-resistant brick, insulation brick thermal clay, lightweight high-grade aluminum brick. The common combination of refractory materials in use has the following points:

1. The service life of chrome corundum brick needs to be further improved

The service life of the chrome corundum brick in the body and the barrel vault of the gasifier is generally 8000~20000h, and that of the slag mouth and the high chrome brick of the bottom of the cone is generally from 3000 ~ 6000h. The mismatch of the service life of each part greatly affects the overall service life of the gasifier and the rhythm of the whole production, and increases the operating cost. Therefore, it is very important to conduct relevant research and further improve the service life of high chrome brick.

2. The problem of sintering should be further investigated and solved

The high volatility of Cr2O3 makes it difficult to sinter and densify. In order to make Cr2O3 materials fully sintered, it is possible to control the combustion of weak reducing atmosphere, using sheath sintering, addition of sintering aid, introduction of nanomaterials, addition of sintering combined with materials and other means to improve the sintering performance of high chromium materials.

3. Thermal shock resistance needs to be improved

Adding monoclinic ZrO2 can improve the thermal shock resistance of chrome corundum brick pit. However, the thermal shock resistance of chrome corundum brick is still poor, and the phenomenon of peeling and cracking often occurs during use, which affects the use of the gasifier to a large extent. Therefore, it is necessary to further strengthen related research to improve the thermal shock resistance of high chromium bricks.

4. Reduce environmental pollution

Because the Cr2O3 in the chrome corundum bricks will be oxidized to poisonous Cr2O3 under certain conditions, polluting the environment. Therefore, how to control the production of CrO3 in the process of production and use, and strengthen the recycling of materials used and the correct treatment of waste, to reduce environmental pollution, is a particular problem to be addressed. to pay attention.

Original resource: https://www.tprefractory.com/news/what-problems-still-need-to-be-solved-in-the-application-of-chrome-corundum-bricks/

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