How To Prolong The Service Life of Fused Cast AZS Sidewall Block

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The fused cast AZS block is widely used in the sidewall in the glass furnaces.
The service life of the fused cast AZS sidewall block determines the campaign
life of the glass furnaces. So, it is important to prolong the service life of
fused cast AZS sidewall block.

How to decrease the corrosion rate of sidewall blocks and improve the corrosion
resistance is the key to prolong the service life of sidewall blocks. It is
well-known that controlling the operation temperature is one of the effective
approaches to prolong the service life of refractory blocks. In different areas
and different periods, different cooling methods should be adopted to achieve
the desired the results.

In the top parts of the sidewall where are not insulated. In horseshoe flame
glass furnaces, as the flame is heating in the surface of glass melt, the
temperature of the upper parts of the glass melt is higher than that of the
lower parts. Silicate is formed and the refining of glass melt produces a lot of
bubbles. Heat convection is very severe here. As a result, the corrosion rate of
is bigger there. To solve this problem, it is necessary to select and design the
cooling fan reasonably. The cooling should be started slowly at first and then
increases gradually to reduce or avoid the thermal stress caused by temperature
gradient.

The service life of fused cast AZS block lasts about 3-5 years. During the
preheating of the glass furnaces, cracks may be formed. After 2-year operation,
there will be holes in the body of the brick. Glass melt may exude though the
holes and cracks. To solve these problems, a single-point, focused and forced
air cooling method can be adopted, which can crease the viscosity and reduce the
temperature of the bricks.

Some special parts of the melting zone is corroded at the fastest rate and not
easy to repair. Due to strong mechanical erosion, the glass furnace can just be
used for 2.5 years before cold repair. Air and spray mixed cooling method can be
adopted here. It is easy, stable and effective. It avoids the problems caused by
the water cooling method.

Shower cooling method is mainly used in the middle and upper parts in the later
period of the glass furnace campaign. 3 years after the cold repair, the problem
of glass melt exudation may occur in these areas. As there are layers of
insulating materials here, forced air cooling and water cooling method can not
be used here. Compared to other methods, shower cooling method is more suitable
for this parts.

Sunrise offers various high quality refractory materials for glass furnaces,
including fused cast AZS, fused cast alumina block, zirconia block, mullite
block, silica block, magnesia block,etc..

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