The function of channels, feed channels and feed troughs is to complete the thermal regulation of glass liquid and transport the glass liquid to the molding machine to form products. The parts that contact the glass here have only a very low erosion rate because the temperature here is lower than the temperature in the clarification part. The glass liquid in these parts is very sensitive to the stones, streaks and bubbles generated by the refractory materials here. The reason is that the defects generated here have little or no chance to assimilate in the glass (or in the case of bubbles, they can only escape by gravity).
Except for some borosilicate glass melting furnaces (where borax is volatile, zirconium refractory materials are required), the environment of the upper structure of these parts is very mild, with only a small amount of steam erosion. Mullite bricks and high-alumina bricks are mainly used here to prevent dripping.
Some parts of these parts, such as slag bricks, stirrers, etc., are partly in contact with the glass and partly not in contact with the glass, so special attention should be paid to their performance (especially thermal shock resistance) because the environment they are in has some special points.
1. Trough bricks, channels
Trough bricks are generally made into single "U"-shaped bricks, but in some glass melting furnaces, due to special refractory requirements, they can be made into multiple pieces to form a U-shaped trough to transport glass materials to the molding machine. At present, molten a, β-corundum bricks, molten AZS bricks and sintered AZS bricks are generally used in actual work. Some special glass melting furnaces, such as borosilicate glass melting furnaces, require dense zirconium bricks. If it is a fiber glass melting furnace, a dense zirconium/chrome brick structure is required.
2. Agitator, slag blocking bricks
These components belonging to the feed channel have a unique environment. They are partly in contact with the glass liquid and partly not in contact with the glass liquid at the same time. The use of these components is also intermittent, because stirring or slag blocking is not continuous. The refractory materials of these components must have a high degree of thermal shock resistance to withstand the operation of entering and exiting the glass liquid, that is, alternating contact and separation from the glass liquid. Mullite-grade refractory materials are the most commonly used, and molten cast refractory materials and sintered zirconium aluminum silicon refractory materials are also used.
3. Consumable parts (material tray, punch, sleeve, material bowl, sub-brick, flow nozzle, etc.)
Since these parts are the last parts in contact with glass on the tank furnace, they are very sensitive to some glass qualities. The erosion rate on the above refractory parts is very slow because the viscosity of the glass is high in these uses. However, due to this high viscosity, these parts will be subject to the combined corrosion/scouring effect. This is especially true for parts such as trough bricks and flow nozzle bricks. These refractory parts, depending on their use, also need to have good thermal shock resistance. The characteristics of the refractory materials used in this area are very different, and must be determined by the quality and service life requirements of these parts and the economic effect of the operation. In some melting furnaces, molten casting refractory materials are mainly used for material trays, trough bricks, flow nozzles, etc. Parts such as punches, sleeves, and material bowls are usually made of mullite, high alumina or sintered AZS refractory materials, which require them to have good thermal shock resistance because they are replaced quite frequently.
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