The independent ceramic water cup structure means that there is a considerable gap between the cup wall of the ceramic water cup and the carbon brick, and there is no carbon brick gland on the top of the cup wall, which is completely independent of the wall structure in the furnace. The cold surface of the wall brick of the independent ceramic water cup is generally flush with the inner molding line of the hearth, while the hot surface of the wall brick is generally completely in the inner volume of the hearth, occupying a larger hearth volume. The biggest feature of the free-standing ceramic water cup is that there is a large (generally 30-100mm) through seam between the ceramic wall and the carbon brick, and the cup wall is independent of the hearth volume.
The embedded ceramic water cup structure means that there are only brick-laying seams between the cup wall of the ceramic water cup and the carbon brick, and there is no gap greater than 10mm. The thickness of the uppermost part of the cup wall is partially or completely embedded in the carbon brick lining, which is the The bricks form an integral wall structure. The hot surface of the wall brick of the fully embedded ceramic water cup is flush with the inner molding line of the hearth. The hot surface of the cup wall brick of the semi-embedded ceramic water cup exceeds the inner molding line of the hearth, occupying part of the hearth volume. The biggest feature of the embedded ceramic water cup is that there is a small (generally less than 10mm) brick seam between the ceramic wall and the carbon brick and the wall of the ceramic water cup is included in the carbon brick masonry.
Due to the relatively large difference in structure between the independent and embedded ceramic water cups, the damage mechanism and use effect are also different. Table 1 shows the differences between the two structures.
It can be seen from the above table that there are too many unfavorable factors in the structure of independent ceramic water cups. Therefore, it is not easy for independent ceramic water cups to have a long life. To a certain extent, it can only depend on the longevity of the carbon brick.
Whether to use ceramic water cups for blast furnace hearths has been controversial at home and abroad. The life of blast furnaces that use a large number of ceramic water cups has not been improved, or even counterproductive. From this point of view alone, we can understand why so many “authoritative people” oppose the use of ceramic water cups in blast furnace hearths.
Post time: Apr-10-2023