1Factors for the Corrosion of Refractory Bricks in Glass FurnacesNews

A glass furnace is constructed with various refractory materials. Different refractory materials are used in different parts. During the actual production, since different parts are subjected to different conditions, the factors for the corrosion can be quite different.

$Factors for the Corrosion of Refractory Bricks in Glass Furnaces$

The corrosion of refractory bricks in the glass furnace can be caused by the chemical, thermal, physical and time factors. The corrosion of refractory bricks is the combined effect of those conditions.

1) Thermal factors

The crowns in different parts of the glass furnace are constructed with silica bricks. Attention should be paid to the volume changes of silica bricks caused by the crystalline transformation during the preheating of the furnace.

Generally rise the temperature slowly to avoid the crack of silica bricks. During the cold repair, the reserved silica bricks should be cooled slowly to avoid damage.

After the cold repair, the furnace enters the continuous production period. The temperature should be strictly regulated and controlled. The temperature in different parts is allowed to fluctuate with a range. Although the reserving of regenerators can cause a 300℃ temperature fluctuation, it has little impact on most refractory bricks except special refractory materials. Therefore, the temperature changes during the normal operation have little damage to refractory bricks.

The maximum temperature of the crowns is in the hot spot area, which the temperature can be up to 1650℃. Even if high quality silica brick with a softening temperature under load above 1650℃ is used, it can be seriously corroded. This is the combined effect of different factors.

Therefore, in the glass furnace, the thermal factors are not alone. Both the corrosion rates of chemical and physical factors are the functions of temperature. It is generally thought that the corrosion rate is doubled when the temperature is increased by 50℃.

2) Chemical factors

All the chemical factors in the glass furnace can be divided into four types:

a) The corrosion caused the reaction between glass liquid and refractory bricks;

b) The corrosion caused by the reaction between batch dust and refractory bricks;

c) The corrosion caused by the reaction between batch volatiles and refractory bricks;

d) The corrosion caused by the reaction between ash and combustion products of fuel and refractory bricks.

During the production, since the environment conditions in different parts are different, the above factors can be quite different.

3) Physical factors

The physical factors are related to the time and temperature. The physical corrosion is mainly caused by the erosion of glass liquid and the gravity of the refractory load.

In the high temperature zone, the erosion of the melting glass liquid will double the corrosion rate. In the low temperature zone, the chemical corrosion is mainly caused by the erosion of glass liquid. When electric boosting and bubbling technology are adopted, the glass liquid is much server. The combined effect of erosion and chemical corrosion can cause great damage to refractory bricks.

The damage caused by the gravity of refractory load occurs mainly in the regenerators. Due to the weight of checker bricks and rider arch, the pressure is big there. After the bricks are damaged by the chemical corrosion, the stress concentrates in those parts and causes the collapsing of the entire body.

4) Time factors

The time factors are the same in the different parts, compared to the other three factors.

Besides those factors above, the structure, conditions and construction can also affect the corrosion of refractory bricks. Those factors can change the thermal, chemical and physical factors and speed up or slow the corrosion rate. Eventually those will affect the service life of glass furnaces.

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Factors for the Corrosion of Refractory Bricks in Glass Furnaces

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