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



 
 
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Old July 6th 15, 10:44 AM posted to rec.crafts.glass
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Default How To Prolong The Service Life of Fused Cast AZS Sidewall Block

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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