FCC catalyst properties can affect cyclone erosion

Click here to enlarge imagePhysical properties of fluid catalytic cracking unit (FCCU) catalysts, such as attrition resistance, density, and particle-size distribution, have varying effects on expected cyclone-erosion rates.Although velocity affects erosion more than any catalyst property, it is often easier to change the catalyst than lower the FCCU feed rate.Many refiners operating FCCUs are pushing their units to achieve higher throughputs and more-severe operating conditions than their original designs. These operations result in higher catalyst loadings and higher velocities through the reactor and regenerator cyclones, which create potential for erosion damage that can limit the r...

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