High-performance Nano-bonded Castables for Petrochemical Applications
1 Federal University of São Carlos, Materials Engineering Department, 13565-905 São Carlos – SP/Brazil
2 CENPES/EB-AB-G-E/EEQ Rio de Janeiro – RJ/Brazil
Revision 05.03.2012, 13.06.2012
Volume 4, Issue 3, Pages 111 - 116
Abstract
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 increase. 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 performed 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 erosion loss was developed for riser application.
Keywords
nano-bonded castables, colloidal silica, sintering additives
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