关键词: font-family:-apple-system, blinkmacsystemfont, ", font-size:14px, background-color:#FFFFFF, ">催化裂化装置, 催化剂, 跑损, 冲击破碎, 热崩, 颗粒直径, 粒度分布

Abstract: During normal operation of a 1.0 MTPY catalytic cracking unit, a sudden catalyst loss (cat loss) fault occurred, and there was no decreasing trend. During the process, there were no abnormalities in the process operation parameters, and the concentration of particulate matter in the discharged flue gas and the solid content of the oil slurry exceeded the standard. By analyzing the particle size distribution, APS (average particle size), and morphology of the catalyst inside the system, it was determined that the catalyst had severely broken, producing a large number of fine powders. It was found that the main wind distributor nozzle and feed nozzle gas velocity of the unit did not change, but the pressure drop of the steam stripping steam pipe changed significantly, and the steam outlet line speed far exceeded the design value, reaching more than 75 m/s. Therefore, it is speculated that the cause of the catalyst loss is the impact and thermal collapse caused by the rupture of the steam stripping steam pipe. Measures such as reducing the unit's processing load, reducing the steam input into the two reactors, and increasing the amount of catalyst replacement have been taken to effectively reduce the catalyst loss without stopping the unit.

Key words: font-family:-apple-system, blinkmacsystemfont, ", font-size:14px, background-color:#FFFFFF, ">FCCU, catalyst, loss, impact crushing, thermal collapse, particle diameter, particle size distribution