催化裂化跑损催化剂的激光粒度及SEM分析

为向催化裂化装置催化剂跑损问题的分析提供理论判据，将跑损催化剂进行了激光粒度及SEM分析。结果表明，催化剂磨损严重时，平衡催化剂中粒径小于40um的小颗粒明显增多，与新鲜催化剂相比分布曲线有较大偏差，显微照片上能观察到部分催化剂已破裂成不规则的小颗粒。因催化剂破碎导致小颗粒大量跑损时，油浆中粒径小于10um的小颗粒明显增加，分布曲线在2～3um处会出现第二个峰值，同时第一个峰值左移；因设备故障导致旋风分离器效率下降时，油浆中粒径大于20um的颗粒明显增加，分布曲线中第一个峰值右移，在40um处出现了第二个峰值。

Study on catalyst loss in FCC by laser particle size and SEM analysis

To provide academic basis for the analysis of the causes for abnormal loss of FCC catalysts, the panicle size distributions （PSD） and scanning electron microscopy （SEM） of lost catalysts in FCCU were measured. The results indicated that the distribution curve of equilibrium catalysts had a big deviation from that of fresh catalysts, the number of smaller particles （ 〈40 um） increased obviously, and smaller irregular particles could be observed on microscopy when abrasion and attrition of catalyst were serious. If panicles fragmentation contributed to a large loss of smaller catalyst particles, the number of smaller particles （ 〈 10 um） would increase obviously in the slurry, the second peak would appear at 2 -3 um in the distribution curve of the catalyst in slurry, and the first peak would shift to the right at the same time. If the separation efficiency of cyclone separator fell down because of equipment trouble, the number of particles larger than 20 um in the slurry would increase apparently, the first peak would shift to the left in the distribution curve, and the second peak would appear at 40 um.