作者：E. Prestes, D.T. Gomes, J. Medeiros, J.L.B.C. Veiga, V.C. Pandolfelli
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刊名：refractories worldforum
ISSN：
出版年：2012-04-01
卷：
期：3
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語種：英文
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內容簡介Nowadays, in the refractory market, castables specially designed for fluid catalytic cracking (FCC) units are not common. One aspect that induces this scenario is the difficulty to attain optimized properties in the temperature range compatible with the process conditions. The development of suitable refractory compositions can be achieved by adding nanoscaled particles, which increases the system reactivity, resulting in high mechanical strength values with the temperature in- crease. Additionally, the use of sintering additives helps the densification at lower temperatures. In this context, colloidal silica bonded castables containing tabular alumina, fused silica or mullite grog and specific sintering additives were designed for riser application. The erosion loss of the developed castables was significantly reduced. Compared with the commercial reference products currently used by the Brazilian petrochemical industry, the nano-bonded material per- formed better for the main usual properties. Based on this novel technology, a self-flow castable with suitable apparent density and thermal conductivity, high thermal shock resistance and reduced ero- sion loss was developed for riser application. castables comprising tabular alumina, fused silica or mullite grog and specific sintering additives were designed for riser application.
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