In the glass melting furnace, the flame generated by the combustion of fuel flows in a turbulent manner, is strong and powerful, and has a certain scouring effect. The maximum temperature of the flame is 1500~1600 degree , and changes with time. Especially when reversing, the temperature fluctuates greatly. The flame is also mixed with batch dust, alkali vapor, boron vapor, lead vapor and carbon particles. The space masonry also bears a certain mechanical load at high temperature. The bricks in the flame space include the kiln roof, breast wall and small furnace part. The damage characteristics of each part and the refractory brick materials used are described below.
The damage characteristics of this part of the brick body are corrosion (mainly alkaline sulfate condensation, forming honeycomb corrosion) and burning, so it is necessary to use materials that are extremely stable to alkali vapor at high temperature and have high load softening temperature and creep resistance. The large arch of the melting furnace flame space adopts high-quality . The 33# fused zirconium corundum bricks used in the breast wall of the melting part have good thermal shock resistance at a high temperature of more than 1200 degree . At the same time, they have good corrosion resistance to alkaline vapor and particulate dust in the batch.
The front wall is a relatively weak part of the glass melting furnace tank kiln. There are three main types of damage to it, namely, erosion of the batch, thermal shock and flame erosion. At present, this part mainly uses 33# fused or sintered AZS bricks, and there are also composites of high-quality silica bricks and sintered AZS bricks. In addition to using high-quality bricks, the front wall also needs to be combined with air cooling.
At present, among the refractory bricks for small furnaces, the crater arch bricks, the small furnace inclined arch top layer bricks, the small furnace bottom plate bricks and the small furnace tongue bricks are the most easily damaged bricks, and are also the weak parts of the pool kiln. The crater arch bricks, crater side wall bricks, bottom plate bricks, inclined arch top layer bricks, tongue bricks and nozzle bricks are made of fused AZS bricks (the weakest part should be made of fused AZS41 bricks), but attention should be paid to the peeling phenomenon of the bricks due to crystal transformation in the range of 1000-1200 degree . The bottom plate bricks can also be made of sintered dense corundum bricks. The small furnace slope arch and horizontal channel arch are generally made of silica bricks.
