重油催化热裂解工艺中铁污染对催化剂性能的影响与对策

摘要

This paper focused on the reasons for deterioration of slurry quality in the heavy oil catalytic pyrolysis process,which leads to coking in fractionator,unqualified products,lower ethylene and propylene yields and the oil slurry system plugging,threatening the long term stable operation of the unit.By the operation data analysis and the catalyst characterization by NH3-TPD and BET,considering the reaction mechanism,it is concluded that high level of Fe in the feedstocks was the main cause of the above issues.The measures are suggested:substantial replacement of balance agent and iron removal from feedstocks.%针对重油催化热裂解工艺装置生产过程中出现的油浆品质恶化,造成分馏塔结焦、油品不合格、主要产品乙烯和丙烯收率偏低及油浆系统堵塞并影响长周期稳定运行等问题,分析了实际运行数据,对催化剂进行NH3-TPD和BET表征,结合对反应机理的认识,认为原料油中铁含量超标是引起上述问题的主要原因,从而提出了大量置换平衡剂和原料脱铁的应对措施.