What are the requirements for the use of refractory materials in glass pool kilns?

      The maximum temperature of the melting pool is 1570-1610°C. The safety limit usually depends on the specific glass composition and the softening point of the silica brick, which starts to soften and drip at 1620°C. Silica bricks are generally used above the molten glass instead of other materials that are more resistant to high temperature. The reason is that in addition to high temperature strength, silica bricks are also compatible with glass in ablation, while other refractory materials are easy to produce incompatibility. Molten stones and other inclusions.

       Under the parapet and the liquid glass surface, most of the refractories with higher density than glass and very dense refractories are used. All refractory materials under the glass page of the melting pool must be forced to cool outside because of their short life, especially at the glass level line where the corrosion rate is the largest. With the aging of the furnace, when other dangerous parts expand, cooling air should also be added to these parts, and the air volume should be gradually increased.

       The surface of any refractory brick that is in contact with the hot glass liquid is the source of defects, so the trick in furnace design is to avoid covering a refractory material as much as possible, and make sure that one surface is exposed to the air in order to dissipate the heat. out. For example, the paving bricks at the bottom of the kiln must not float to prevent glass from entering under the bricks, and the above-mentioned silica bricks covered with thermal insulation materials on the kiln roof also agree with this.

       The batch is charged from the rear end of the melting pool and floats forward until it is completely melted, usually in the area of the third pair of craters. The pass point of the furnace is usually in the middle and moves forward in proportion to the amount of cold batch input, possibly to the third pair of flaming ports.

       The most severely eroded refractory is in the area of the first two pairs of craters of the floating stockpile, where the respective bodies are also most likely to be blocked. The clarifier is also the least eroded area, and this area is usually unfired.

       The function of the bridge wall is to separate the two different temperature zones, and it also serves as a skimmer, through which the molten glass flows out.

       The flow hole plays a large role in cooling, which reduces the molten glass from the melting temperature of 1540-1590 °C to the temperature of about 1260-1310 °C in the clarifier. The forehearth is a temperature-controlled channel, which is connected to the clear discharge hole, and its function is to reduce the temperature of the glass liquid to about 1100°C for the purpose of forming the gob.