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洛阳石化2号催化裂化装置设计加工规模为1.4Mt/a,设计运行时数为8400h/a。大检修期间,针对该装置主要改造内容,以及开工后实际运行状况,找到了影响装置长周期运行的4条主要因素:装置的进料主要由加氢蜡油和闪蒸塔底油组成,闪蒸塔底油的掺炼比例高达70%,装置运行负荷高达110%,由于进料性质差,加工负荷高,操作调整较为频繁;由于原料变劣,硫、氮含量上升,反应过程中形成的硫化物、氮化物协同待生催化剂进入再生系统,在再生系统的低温部位发生低温硫酸、硝酸、氰酸露点腐蚀;随着原料逐渐变劣、变重,装置结焦倾向增加,重点围绕沉降器汽提段格栅及分馏塔进行问题说明;实际生产中,催化剂单耗逐渐增加,平衡剂中重金属含量略有上升,其中镍含量上升明显,平衡剂0～40μm的细粉含量也逐步上升。结合以上问题,提出相应的建议与对策。
Luoyang Petrochemical 2 catalytic cracking unit design and processing scale of 1.4Mt / a, the design run time of 8400h / a. During the overhaul period, four main factors that affected the long-period operation of the plant were found according to the main reformation contents of the device and the actual operation status after start-up. The feed of the device mainly consists of hydrogenated wax oil and flash tower bottom oil, Due to the poor feed quality and high processing load, operation adjustment is more frequent. As the raw materials become worse, the contents of sulfur and nitrogen increase, and the formation of Sulfides and nitrides enter the regeneration system together with the spent catalyst, dew point corrosion of low temperature sulfuric acid, nitric acid and cyanic acid takes place in the low temperature part of the regeneration system. As the raw materials become worse and heavier, the coke tendency of the device increases, In the actual production, the unit consumption of catalyst gradually increased, the content of heavy metals in the balance agent increased slightly, and the content of nickel increased obviously. The content of fine powder of balance agent 0 ~ 40μm also increased gradually. Combined with the above problems, put forward corresponding suggestions and countermeasures.