Configuration of refractory materials at the bottom of glass melting furnace
This part of the glass melting furnace bottom is only corroded by the liquid phase, and is not corroded by the glass liquid level and the three-phase interface. Only when the molten glass reaches the underside of the layered refractory bricks will undercutting occur. The erosion products on the kiln bottom structure tend to remain on the surface of the refractory material due to gravity, at least to a certain extent. Therefore, refractory materials with poor corrosion resistance can be used in this location. However, as the convection pattern of the liquid flow changes or the furnace load changes, this location (when using refractory materials with poor corrosion resistance) may also easily cause defects in the glass.
Bubbling from the bottom of the kiln is a common method. The local turbulence caused by bubbling requires the use of refractory materials with better corrosion resistance in this area. A common practice is to separate from the customary paving of kiln bottom bricks and use thicker molten cast refractory materials in those areas. Such thicker bricks are beneficial to the balance of the furnace life and can prevent problems caused by layered structures. causing interference and damage.
Glass batches mixed with metal impurities have a serious impact on the kiln bottom structural materials. The kiln floor is the area where metal entering the furnace is most likely to deposit. The metal deposited on the kiln floor structure can erode holes in the refractory material in a manner similar to the upward eroding effect of molten glass on the refractory material. It is generally believed that the lower the melting point of a metal, the greater and more significant its corrosion rate will be compared to iron and iron alloys. In individual cases, due to the conditions in the furnace, the metal can be reduced directly from the glass.
The structure of the furnace bottom of a furnace for melting high aluminum content glass is special in terms of the general form of the furnace bottom in the glass industry, because the bottom refractory material or the upper refractory material has a tendency to drift or float. This is completely Due to the high density of glass. For this reason, the best kiln floor structure suitable for melting high lead glass is a whole layer of kiln floor using a single refractory material. The most commonly used is melt-cast zirconium aluminum silicon refractory material.
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