Design of the upper refractory brick structure of the clarifier section of a glass furnace

Similarly, the temperature in this area is much lower than that in the melting section. The environment of the upper structure of the clarifier section depends largely on the structure of the lattice wall, that is, the way the end wall is separated from the melting section. When an open lattice wall structure is used, vapor condensation corrosion may occur due to the conditions created in the melting section. The refractory bricks of the upper structure are in a relatively cold area, so this condensation reaction occurs on the surface of the refractory bricks. Generally speaking, the corrosion is mainly caused by alkali vapor. After the atmosphere of the melting section and the clarifier section is completely isolated, only a small amount of vapor escapes from the surface of the glass liquid to corrode the refractory bricks in this area. Borosilicate glass melting furnaces do not follow this rule. Here, the surface of the glass continuously releases volatile sodium borate, even in the forehearth. Generally speaking, the best practice for borosilicate glass furnaces is to use zircon refractory bricks or silica refractory bricks.

For the long-term stability of refractory bricks, it is important that their surface remains intact after exposure to vapor. In other words, there should be no peeling, flaking, delamination, or spalling of the refractory surface. Resistance to thermal shock is not important, as this area is normally stable. Many horseshoe flame furnaces may sometimes be corroded by solid fly ash from the batch if they are not properly fired or operated. Many furnaces that melt most types of glass use conventional silica refractory bricks in the above areas.

(1) Arch roof

Almost all furnaces use siliceous refractory brick arch roofs,

(2) Bridge wall covers, gap bricks, breast walls

Using ordinary refractory bricks is generally successful. The refractory bricks used are very different, including silica bricks, clay bricks, mullite bricks, sillimanite bricks, high alumina bricks, and sintered zircon bricks.