With the improvement of float design level and the advancement of refractory material production technology, float glass melting furnaces are developing in the direction of large-scale and high-age furnaces. At present, the designed furnace age of domestic float glass melting furnaces is generally 8-12 years, while the age of high-level glass furnaces abroad has reached 15-20 years. In addition to the gap between the technical level of furnace refractory production and foreign countries, the L-type The service life of the hanging wall is also an important "bottleneck" that restricts the age of the furnace.
The traditional L-shaped suspended wall nose area and straight wall section are a whole, which cannot be replaced and repaired. It can only be "one wall for life". According to the current domestic production level of L-shaped suspended walls, a traditional, well-configured L-shaped suspended wall can basically meet the service life of 8-12 years. Therefore, in order to extend the service life of the furnace, it is necessary to increase the service life of the L-shaped suspended wall and improve the structure of the L-shaped suspended wall. Therefore, a new design concept for the development and design of suspended walls is adopted, which is to improve the vulnerable part of the L-shaped suspended wall - the nose area - into a replaceable suspended wall that can be partially hot repaired and replaced.
The selection of refractory materials in the nose area is divided into refractory selection before replacement and after replacement. Based on our many years of experience in suspended wall research and research on internationally advanced suspended wall refractory materials, we determined the selection of refractory materials before and after the replacement of replaceable suspended walls.
The refractory material in the nose area before replacement is a composite snap-button structure, that is, a snap-lock structure in which sintered zirconium mullite bricks are inlaid with fused zirconium corundum bricks.
We have many successful engineering application examples of this structural type of materials, and it can guarantee the service life of the nose area structure for 8 to 12 years.
The selection of hot repair refractory materials must consider the following two factors:
① It will not burst when it is suddenly placed at room temperature and placed in a high temperature environment above 1000°C;
②The reading volume (382) domain has good corrosion resistance.
Therefore, this kind of refractory material must have extremely high thermal shock performance and good resistance to erosion by acidic materials and alkaline materials.
After comprehensive comparison and screening, and with reference to foreign experience, we determined to select a refractory material with zero expansion and high corrosion resistance as the material for hot repair and replacement. Using this heat-replaceable material together with the cold-installed composite buckle structure can meet the needs of a kiln service life of 15 to 20 years. At the same time, the suspended wall also has the characteristics of repeated replacement and multiple hot repairs.
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