The service life of the glass furnace, energy efficiency and the quality of glass is mainly up to refractory materials. The following practices can be performed in order to select the right refractory materials and ensure longer operating life of the glass furnace.
The quality of the refractories needs to be consistent and assured. Refractories should be bought from reliable manufacturers. Normally, reliable manufacturers can develop the correct physical properties of the refractories such as high temperature strength and correct mineral structure. Once these desired properties are achieved, the performance of the refractories will be predictable and better.
The use of larger refractory blocks reduces the number of joints while constructing a furnace. Recently, large sidewall blocks made up of fused cast AZS are used in the glass furnace to reduce the joints and the corrosion of refractories. The manufacturing of large blocks requires a high-capacity press for developing uniform property characteristics. Hence, it is necessary to consider the dimensions of the block and its properties to ensure its suitability for a particular application. Further, random samples should be analyzed to make sure that its properties can meet the requirement of the operating environment.
The quality of the mortar and ramming mix used in the glass furnace should be similar to the quality and properties of the refractories. AZS ramming mix is used to join the fused cast AZS blocks, while low shrinkage high alumina mortar is used for joining the high alumina blocks.
The dimensions of the refractories should be accurate and warpage-free.
The the refractories is likely to be damaged due to contact with molten glass and slags. In general, sparking and corrosion are the main causes of the wear and tear of refractories in the glass furnaces. Refractories with good resistance to sparking and corrosion are preferable for the glass melting furnace. Anti-corrosion refractory materials particularly suitable for alkali attack can be considered. The coating should be uniform.
Since the operating environment of different parts are different, it is necessary to select the right refractory materials. Silica bricks are preferred in the crown and the fused cast AZS block is ideal for the sidewall and tank bottom.
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