重油催化裂解催化剂结焦影响因素的研究

针对重油在CPP工艺催化剂CEP-1上的催化裂解过程，利用小型固定流化床实验装置研究了反应温度、剂油质量比、水油质量比、油气停留时间和原料性质对焦炭收率和积炭率的影响。发现积炭率随剂油质量比、水油质量比及原料n（H）／n（C）的增加而减小，而随反应温度以及原料芳碳率的增加而增大；焦炭收率随反应温度、剂油质量比以及原料芳碳率的增加而增大，随水油质量比及原料n（H）／n（C）的增加而减小；积炭率和焦炭收率均随油气停留时间的延长存在最低值。原料的n（H）／n（C）和芳碳率均能够较好地反映出原料的结焦性能。在实验基础上，建立了积炭率和焦炭收率与原料性质和操作条件的经验关联模型，利用最小二乘回归求得了模型参数。

Influencing Factors of Coking for Heavy Oil Catalytic Pyrolysis

The coking performance for the catalytic pyrolysis of heavy oil with temperature, weight ratios of catalyst-to-oil and steam-to-oil and residence time, was investigated in a confined fluidized bed reactor on catalyst CEP-1, with a special catalyst of catalytic pyrolysis process （CPP） technology. The coke content on catalyst decreases with the increase of the weight ratios of catalyst-to-oil and steam-to-oil and n （H）/n （C） of the feed, and it increases with the enhancement of reaction temperature and aromaticity of the feed. Coke yield increases with increasing reaction temperature, catalyst-to-oil weight ratio and aromaticity, while decreases with increasing steam-to-oil weight ratio and n （H）/n （C） of the feed. Both coke content and coke yield show minimum as residence time of oil gas prolongs. Both n（H）/n（C） and aromaticity of the feed can well reveal the coking tendency of a feed. On the basis of the experimental research, a correlation model of coke content and coke yield with feed property and reaction conditions was established. The parameters in the model were calculated by least square regression.