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催化油浆具有黏度低、密度大、康氏残炭小、芳烃含量高、胶质含量低等特点。催化油浆中固体颗粒的分离方法有:自然沉降法、静电分离法、旋流分离法、沉降剂脱除法、过滤分离法等。目前,催化油浆进焦化装置掺炼前的净化方式以自然沉降为主。焦化装置掺炼催化油浆后,焦化蜡油的残炭和芳烃含量增加,石油焦的灰分增加,轻油收率降低,且油浆中的催化剂颗粒在换热器、分馏塔、加热炉、泵及管道内造成磨损和沉积结焦,影响装置长周期运行。采取如下措施:化学助剂沉降加充分自然沉降,降低催化油浆中的固体含量;控制油浆掺炼比例;原料在线混合;原料换热器的优化设计;焦化加热炉多点注水改注汽;增加循环比;增加焦化加热炉第二、三点注汽量;焦炭塔操作优化和加热炉炉管的测厚监控等,可有效约束掺炼催化油浆对延迟焦化装置产品和设备的负面影响。
The catalytic slurry has the characteristics of low viscosity, large density, small Conradson charcoal, high aromatic content and low colloidal content. Catalytic slurry of solid particles in the separation methods are: natural sedimentation, electrostatic separation, cyclone separation, sedimentation removal, filtration separation. At present, the purification method of catalytic oil slurry into coking unit before mixing is mainly natural sedimentation. After the coking unit mixes the catalytic slime, the residual carbon and aromatic content of the coker gas oil increases, the ash content of the petroleum coke increases, the light oil yield decreases, and the catalyst particles in the slurries are mixed in the heat exchanger, the fractionating tower, the heating furnace, Pumps and piping caused by wear and sedimentation coke, affecting the device long-term operation. Take the following measures: chemical additives settling plus full natural settlement, reducing the solid content of the catalytic slurry; control slurry mixing ratio; raw materials online mixing; optimization of raw material heat exchanger design; ; Increase the cycle ratio; increase the second and third coking furnace steam injection volume; coke tower operation optimization and furnace furnace tube thickness monitoring, which can effectively restrict the blending of catalytic slurry on the delayed coking device products and equipment negative influences.