催化裂化催化剂钙中毒的影响与对策OA

Objective This study aims to address the significant reduction in heavy oil cracking capacity and repeated fouling of the slurry steam generator caused by catalyst calcium poisoning in a fluid catalytic cracking(FCC)unit.Method The phenomena,causes,and mechanisms of catalyst calcium poisoning in the unit were analyzed.Measures such as injecting an in-situ crystallized heavy oil catalytic cracking catalyst,using high-quality equilibrium catalysts as replacements,and applying crude oil decalcifying agents were implemented to address the calcium poisoning problem at its source.Result First,after injecting 20 wt%in-situ crystallized heavy oil catalytic cracking catalyst,the heavy oil cracking capacity was significantly improved even when the calcium mass fraction in the equilibrium catalyst remained around 10,000 μg/g.Second,after using crude oil decalcifying agents,the fouling problem in the slurry steam generator was resolved when the calcium mass fraction in the equilibrium catalyst decreased to 4,000 μg/g.Conclusion When calcium poisoning occurs in the FCC catalyst,injecting an in-situ crystallized heavy oil catalytic cracking catalyst and using high-quality equilibrium catalysts as replacements can mitigate low heavy oil conversion.The use of crude oil decalcifying agents can fundamentally resolve and prevent catalyst calcium poisoning.