The function of the glass melting furnace is to form a flame space with the breast wall and the front wall. At the same time, it can also be used as a medium for the flame to radiate and transfer heat to the material and the glass liquid, that is, to absorb the heat released by the combustion of the fuel and then radiate to the liquid surface of the glass. on. According to the length of the melting part, the big chute can be divided into several sections, generally at least 3 sections or more. During masonry, a 100-120mm expansion joint is reserved between each section of the dome, and the expansion joints on the top of the dome at the front and rear gables should be wider.
The masonry is generally made of high-quality silica bricks, the shape of the bricks is wedge-shaped, the transverse joints are made of staggered joints, and the mortar joints are generally 1~2mm. The life of the big chute determines the age of the entire furnace. The weak links of the big chute in use are the cavities such as temperature measuring holes and pressure holes, the transverse joints of the big chute bricks, the chute head of each section and the sides of the big chute.碹 part. When the kiln is in normal operation, the kiln is under positive pressure, and the various cavities on the top of the kiln are easily burnt due to the fire. If the side turret is not in close contact with the steel ballast, it is easy to be washed and burned by the flame. Therefore, refractory materials with better performance should be used in these places. At the same time, the sealing mud of the brick joints and the outer layer of the silica brick requires good performance, and has good high temperature resistance and alkali vapor resistance.
Experiment
The purpose of the experiment is to study the temperature resistance of different sealing materials and whether they react with the dome refractory.
The experimental materials include large silica bricks, lightweight thermal insulation silica bricks, and sealing mud. 3 types of sealing mud composition
experimental method
A lift-type high-temperature furnace is used to simulate the structure of the dome-top refractory material, and the sealing mud is used between the large-sized silica brick and the light insulation brick, and the high-temperature sintering test is carried out under the same conditions. The specific operation is as follows: Put a piece of silica brick on the bottom, apply a layer of sealing compound in the middle, and cover the upper part with light insulation brick (as shown in Figure 1). Start heating from room temperature, keep it at 1350°C for 10 minutes, lower it and open it for observation. Then continue to raise the temperature, and observe the sintering conditions of silica bricks, lightweight insulation bricks and sealing mud at 1350°C, 1400°C, 1450°C, and 1600°C respectively.
in conclusion
Through the high temperature sintering test, it is concluded that the silicon and aluminum silicon sealing compound can withstand the high temperature of 1600 ℃, and does not react with the large silica bricks and insulation bricks, while the aluminum silicon sealing compound introduced with calcium oxide can be used at 1350 ℃. The phenomenon of sintering and melting into a glass body occurs. After a high temperature of 1600°C, all of it penetrates into the refractory material that it contacts, which will further corrode the brick body and form defects in the glass, so it cannot be used for sealing of the large stone.
