The supporting part of the inclined air duct is made of refractory bricks, which are cantilevered layer by layer to support the load of the upper masonry. The temperature fluctuates frequently, and the coke dust entrained by the circulating gas scours this part violently. Therefore, the inclined air duct area adopts thermal shock resistance and wear resistance. Mullite-silicon carbide brick masonry with high strength and flexural strength. Judging from the current use, the effect is not ideal, and some supporting bricks in the CDQ inclined air duct area broke within less than a year.
For the maintenance of the supporting bricks of the inclined air duct, one method is to use the original mullite-silicon carbide bricks to build again; the other method is to use the castable to pour; the third method is to use the wear-resistant castable prefabricated blocks to build again. build.
The pouring method of the castable adopts the setting of anchors and reinforcing ribs. After the residual bricks are removed, high-strength and wear-resistant aluminum silicon carbide steel fiber castables are used for repair. In order to solve the combination between the brick and the castable, the surface of the original brick is drilled and fixed with expansion bolts, and a certain length of “Y” stainless steel anchors are welded to the outside of the expansion bolts. The working surface should be 50mm. The disadvantage of adopting this method is mainly that the castable falls as a whole, causing damage to the original refractory bricks, which is inconvenient for subsequent maintenance.
For castable prefabricated blocks, in order to improve the strength, wear resistance and thermal shock resistance of the inclined air duct support, high-strength wear-resistant castable prefabricated blocks are used to replace bricks, and castable prefabricated blocks are used to replace damaged refractory bricks. This method is effective and can generally be used for more than two years.