Abstract
Oxy-fuel flames have been used increasingly to boost the pull rate of glass melting furnaces. The process allows improvement in productivity with very low capital investment followed by a reduction in energy costs. If proper operational conditions are attained, an important reduction of environmental impact due to NOx, and particulate emission rates can be achieved. White Martins Gases Industriais S.A. (affliated with Praxair, Inc.) and Companhia Vidraria Santa Marina (Saint Gobain Group) tested the convsive behavior of silica and mullite refractories in an oxy-oil fired industrial glass melting fume. XRD, SEM, mercury porosimetry, and X-ray fluorescence were used to characterize the phases and the extent of alkaline attack. The results showed that the performance of silica and mullite refractories decreased in atmospheres promoted by oxy-oil combustion process. This is because of the intensified action of alkalis leading the formation of silicates with low melting points in those refractories.
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